JP2019119895A - Manufacturing method of zinc bullion - Google Patents

Abstract

To provide a manufacturing method of zinc bullion capable of stably mass producing zinc bullion having purity equivalent to a special high grade at good yield.SOLUTION: Following processes are included: a process 101 for producing a zinc-containing solution containing a zinc component by using a reduction furnace dust or a secondary dust generated when the reduction furnace dust is reduced by a reduction furnace, a processes 102 and 103 for generating purified zinc chloride containing purified zinc chloride by chlorinating a zinc component of a zinc-containing compound by setting the zinc component in the zinc-containing solution as the zinc-containing compound with at least one shape of carbonate, hydroxide and oxide, a process 104 for generating anhydrous molten purified zinc chloride containing anhydrated molten purified zinc chloride by anhydrating the purified zinc chloride, and a process 105 for generating zinc bullion as an electrolytic product by electrolyzing the anhydrous molten purified zinc chloride.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of producing zinc ingot, and in particular, a reduction furnace for recycling a portion of electric furnace dust and electric furnace dust generated during melting and smelting of scrap in an electric furnace method which is one of iron making processes as a zinc material. Secondary dust (coarse zinc oxide) or blast furnace dust generated in the blast furnace method, which is one of iron making processes, recovered as zinc-containing oxide in a rotary hearth furnace The present invention relates to a method of producing zinc metal as a raw material.

  In the electric furnace method which is one of the iron making processes, electric furnace dust is generated as industrial waste which corresponds to about 1.5% to 2.0% of the amount of steel making at the time of melting and smelting of scrap and which contains zinc oxide components. Electric furnace dust is said to occur 8 million tons in the world and 400,000 tons in Japan.

  Most of the iron scraps are waste buildings, waste home appliances or waste cars. The paint base of the waste building, the waste home appliance or the waste car is galvanized. In addition, the scrap contains paints, plastics, oils and the like. For this reason, in addition to heavy metals such as zinc or lead, harmful dust organic substances such as chlorides and dioxins are also contained in electric furnace dust. On the other hand, electric furnace dust contains about 20 to 30% iron and 20 to 30% zinc. Also, crude zinc oxide contains about 10% iron and about 60% zinc. Therefore, electric furnace dust and secondary dust (crude zinc oxide) are very useful as resources.

  Here, crude zinc oxide produced from electric furnace dust by various recycling techniques is a raw material for dry and wet zinc smelting. The main recycling technology is the Wells furnace method, but in addition, the plasma method, the electric smelting reduction method, the MF furnace method, or the rotary bed furnace method may be mentioned. However, in order to efficiently obtain zinc ingots having a purity of 99.995% (wt%), a leaching method is used in which sulfide ore is leached with dilute sulfuric acid as a raw material.

  Under such circumstances, Patent Document 1 and Patent Document 2 relate to a method for producing zinc, using an electric furnace dust or a secondary dust containing a halogen component as a raw material to realize an on-site type zinc smelter at the place where the dust is generated. Discloses a configuration intended to do so.

  Further, Patent Document 3 relates to a wet zinc smelting process, and when producing metallic zinc from a zinc oxide-containing raw material by a wet smelting process, hydrochloric acid is used to dissolve zinc in the raw material by nearly 100%, thereby dissolving the hydrochloric acid. Impurities other than zinc in the solution are removed to produce a purified zinc chloride aqueous solution, and a tertiary carboxylic acid is used in the purified zinc chloride aqueous solution to form a tertiary carboxylate zinc, and this tertiary carboxylic acid is produced. It is disclosed to add sulfuric acid to a medium containing zinc acid to form a zinc sulfate water bath, and electrolyze the zinc sulfate water bath to produce metallic zinc.

  Also, Patent Document 4 relates to a chloride melting method for separation and recovery of zinc, and a method for producing zinc chloride from a zinc-containing first and / or second material comprises chlorinating a zinc-containing material such as chlorine. Reacting with the agent to convert the metal to chloride and melt, the volatile components of the molten reaction product are volatilized at a temperature between the melting point of the reaction product and the boiling point of zinc chloride, thereby zinc From the step of recovering the chlorination melt which is abundant in the latter, and thereafter distilling the zinc chloride from the chlorination melt which is rich in the zinc and thereby recovering the chlorination melt which is poor in zinc chloride and zinc refined Will be disclosed. Also, in the first aspect of the method of Ashcroft, which is referred to as the wet aspect, the chlorination reaction involves the use of an insoluble oxide that is not readily converted to chloride during the reaction and a chloride melt that includes gangue. Products are then dissolved in water and purified so that the entire melt is separated into insoluble fractions, iron and manganese are removed in aqueous solution by the addition of zinc oxide and chlorine, other metals are lead and The purified zinc chloride solution, which is cemented by the addition of zinc metal and / or purified, is then boiled again and, prior to the actual electrolysis of zinc, preliminary electricity using a crude consumable carbon anode It is disclosed that the decomposition results in the final dehydration of zinc chloride.

International Publication No. 2014/181833 International Publication No. 2015/030235 Japanese Patent Application Laid-Open No. 52-062124 Japanese Patent Application Publication No. 2005-504889

  However, according to the study of the present inventor, in the configuration disclosed in Patent Document 1 and Patent Document 2, a zinc metal having a purity equivalent to 99.995% of special high grade is manufactured from electric furnace dust or secondary dust. Although it is possible, there is a certain limit to the improvement of the yield, and there is room for improvement when mass-producing such zinc metal.

  Further, in the configuration disclosed in Patent Document 3, metallic zinc having a purity of 99.99% is produced by a wet smelting process, but the process up to the electrolysis step with a zinc sulfate bath after producing purified zinc chloride is carried out. The processing steps are complicated, and there is room for improvement including the improvement of the purity of the resulting metallic zinc.

  In addition, although the construction disclosed in Patent Document 4 discloses wet and dry methods for producing zinc chloride and zinc, in either method, a zinc-containing raw material is reacted with a chlorinating agent such as chlorine to form a metal. The goal is to obtain zinc metal with a special high grade quality with a purity of 99.95% by weight or more, as it needs to be melted once after conversion to chloride, and processing is complicated. No disclosure or suggestion has been made on the improvement of the yield for actually mass-producing metal zinc having a purity of 99.995% equivalent to the special high grade in a stable manner.

  Under such circumstances, the present inventor produces a zinc-containing aqueous solution containing a zinc component in the raw material when using the electric furnace dust or a secondary dust generated when the electric furnace dust is reduced by a reduction furnace as the raw material A zinc-containing aqueous solution is first generated, and the zinc component in the zinc-containing aqueous solution is converted into a zinc-containing compound in at least one form of carbonate, hydroxide and oxide, and such zinc-containing compound is used While producing purified zinc chloride containing purified zinc chloride and dehydrating the purified zinc chloride to form anhydrous molten purified zinc chloride containing anhydrous molten purified zinc chloride, When zinc metal is produced as an electrolysis product by electrolyzing anhydrous molten refined zinc chloride, the purity of the zinc metal is stably made 99.995% or more. It was found that it is.

  The present invention, which has been made through the above studies, provides a method of producing zinc metal that can stably mass-produce zinc metal having a purity of 99.995% equivalent to a special high grade. The purpose is

  In order to achieve the above object, according to the first aspect of the present invention, the method of producing zinc ingot comprises: electric furnace dust or secondary dust generated when the electric furnace dust is reduced by a reduction furnace; A zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution containing the zinc component according to the above, and the zinc component in the zinc-containing aqueous solution as a zinc-containing compound in at least one form of carbonate, hydroxide and oxide; A purified zinc chloride-generating step of producing purified zinc chloride containing purified zinc chloride while using a zinc-containing compound, and an anhydrousized molten purified zinc chloride by anhydrousizing the purified zinc chloride A process of producing anhydrous molten refined zinc chloride to produce anhydrous molten refined zinc chloride, and electroforming the anhydrous molten refined zinc chloride to produce zinc metal as an electrolytic product Comprising zinc bullion generation step that, a.

  In addition to the first aspect, the present invention further includes a zinc extraction step of selectively extracting the zinc component from the raw material to generate the zinc-containing aqueous solution, in addition to the first aspect. The purified zinc chloride producing step separates the zinc component from the zinc-containing aqueous solution as the zinc-containing compound, and the zinc component in the zinc-containing compound is chlorinated to produce the purified zinc chloride And chlorination step, wherein said anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating said purified zinc chloride in a molten state to produce said anhydrous melt-refined zinc chloride, said zinc metal production step The second aspect of the present invention is to have an electrolysis step of electrolysis using the above-mentioned anhydrous molten purified zinc chloride as an electrolytic bath.

  In addition to the second aspect of the present invention, metal zinc is brought into contact with the zinc-containing aqueous solution generated in the zinc extraction step to make a metal impurity component nobler than zinc in the zinc-containing aqueous solution. It is a third aspect of the present invention to further include a substitution step of reducing precipitation.

  In addition to the second aspect of the present invention, the zinc-containing aqueous solution produced in the zinc extraction step is brought into contact with an oxidizing agent to separate iron component and manganese component in the zinc-containing aqueous solution. An iron demanganese step, and a substitution step of bringing metallic zinc into contact with the zinc-containing aqueous solution subjected to the iron removal manganese step to reduce and deposit a metallic impurity component nobler than zinc in the zinc-containing aqueous solution; The fourth aspect is to have. Here, in the deferrous-demanganese process, an acid or an alkali agent for pH adjustment may be appropriately added together with the oxidizing agent to improve the impurity removal effect in the deferrous-demanganese process. Moreover, about the order of implementation of a deironing demanganese process and a substitution process, the process after a substitution process may be a deironing demanganese process. For example, in the case where the raw material passes through the reduction process of iron such as secondary dust, there are cases where the iron component contained in the raw material contains a large amount of divalent (ferrous iron component). The reason is that it is more reasonable to carry out the replacement step first. With regard to the order of execution of such a deferrous demanganese step and a substitution step, in all the embodiments (third and fifth to seventeenth embodiments described later) in which both the deferrous demanganese step and the substitution step are performed. The same is true.

  In addition to the second aspect of the present invention, in the zinc chlorination step, the zinc-containing compound is brought into contact with an aqueous solution of hydrochloric acid to produce a purified zinc chloride aqueous solution which is an aqueous solution of the purified zinc chloride, Contacting the metal zinc with the purified zinc chloride aqueous solution to reduce and deposit a metal impurity component nobler than zinc in the purified zinc chloride aqueous solution; evaporating the purified zinc chloride aqueous solution subjected to the substitution process; And a concentration step of concentration is a fifth aspect.

  In addition to the fifth aspect, the present invention separates the iron component and the manganese component in the zinc chloride aqueous solution by bringing the oxidizing agent into contact with the purified zinc chloride aqueous solution generated in the zinc chloride step. According to a sixth aspect, the method further includes a deferrous-demanganese-removing step, and in the substitution step, the metallic zinc is brought into contact with the purified zinc-containing aqueous solution that has undergone the deferrous-demanganese-removal step.

  In the present invention, in addition to the first aspect, the zinc-containing aqueous solution producing step selectively chlorides the zinc component by contacting the raw material with chlorine gas and evaporating it to produce zinc chloride. And dissolving the zinc chloride in water to form an aqueous solution of zinc chloride, wherein the step of producing purified zinc chloride comprises contacting the aqueous solution of zinc chloride with an alkaline agent and an oxidizing agent, and Deferrous-demanganese separation step for separating iron component and manganese component in zinc chloride aqueous solution, and substitution for reduction precipitation of metal impurity component more noble than zinc in zinc chloride aqueous solution from which iron component and manganese component are separated And the concentration step of evaporating and concentrating the aqueous solution of zinc chloride in which the metal impurity component has been reduced and precipitated to produce the purified zinc chloride; the iron component and the manganese component Separating the zinc component as the zinc-containing compound from the separated aqueous solution of zinc chloride and returning it to the deferrous-demanganese-removing step; It has a dehydration step of dehydrating zinc in a molten state to form the anhydrous molten purified zinc chloride, and the zinc metal production step has an electrolysis step of electrolysis using the anhydrous molten purified zinc chloride as an electrolytic bath. The seventh phase.

  Further, in addition to the first aspect of the present invention, the zinc-containing aqueous solution producing step selectively extracts the zinc component from the raw material to produce the zinc-containing aqueous solution, and the zinc A selective chlorination step of selectively chlorinating the zinc component by contacting chlorine gas with the residue in the extraction step to evaporate the zinc component to form zinc chloride; and a dissolution step of dissolving the zinc chloride in water to form a zinc chloride aqueous solution And said purified zinc chloride producing step comprises contacting iron with said zinc chloride aqueous solution with an alkali agent and an oxidizing agent to separate iron component and manganese component in said zinc chloride aqueous solution, and A substitution step of reducing and precipitating a metallic impurity component nobler than zinc in the aqueous solution of zinc chloride from which an iron component and the manganese component are separated; The zinc chloride aqueous solution is evaporated and concentrated to form the purified zinc chloride, and the zinc separation step of separating the zinc component from the zinc-containing aqueous solution as the zinc-containing compound and returning it to the iron removal manganese removal step And the above-mentioned anhydrous melt-refined zinc chloride producing step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride, and the zinc metal producing step It is an eighth aspect of the present invention to have an electrolysis step of electrolysis using the anhydrous molten purified zinc chloride as an electrolytic bath.

  In the present invention, in addition to the first aspect, the zinc-containing aqueous solution producing step selectively chlorides the zinc component by contacting the raw material with chlorine gas and evaporating it to produce zinc chloride. And dissolving the zinc chloride in water to form an aqueous solution of zinc chloride, wherein the step of producing purified zinc chloride comprises contacting the aqueous solution of zinc chloride with an alkaline agent and an oxidizing agent, and Deferrous-demanganese separation step for separating iron component and manganese component in zinc chloride aqueous solution, and substitution for reduction precipitation of metal impurity component more noble than zinc in zinc chloride aqueous solution from which iron component and manganese component are separated A zinc separation step of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step, and the zinc component in the zinc-containing compound A process for producing zinc chloride which is purified by chlorination to produce purified zinc chloride; and the process for producing anhydrous dry purified zinc chloride is a process for dehydrating the purified zinc chloride in a molten state to produce anhydrous dry purified zinc chloride In the ninth aspect of the present invention, the step of producing the zinc metal has an electrolysis step of electrolysis using the anhydrous molten refined zinc chloride as an electrolysis bath.

  Further, in addition to the first aspect of the present invention, the zinc-containing aqueous solution producing step selectively extracts the zinc component from the raw material to produce the zinc-containing aqueous solution, and the zinc A selective chlorination step of selectively chlorinating the zinc component by contacting chlorine gas with the residue in the extraction step to evaporate the zinc component to form zinc chloride; and a dissolution step of dissolving the zinc chloride in water to form a zinc chloride aqueous solution And said purified zinc chloride producing step comprises contacting iron with said zinc chloride aqueous solution with an alkali agent and an oxidizing agent to separate iron component and manganese component in said zinc chloride aqueous solution, and A substitution step of reducing and precipitating a metallic impurity component nobler than zinc in the aqueous zinc chloride solution from which the iron component and the manganese component are separated; and the zinc chloride obtained through the substitution step A zinc separation step of separating the zinc component from the solution as the zinc-containing compound, and a zinc chloride step of salifying the zinc component in the zinc-containing compound to produce purified zinc chloride, the anhydrous melting purification The zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous molten purified zinc chloride, and the zinc metal production step uses the anhydrous molten purified zinc chloride as an electrolytic bath It is called a tenth aspect to have an electrolysis step of electrolysis.

  In addition to the first aspect of the present invention, the zinc-containing aqueous solution producing step further comprises a hydrochloric acid leaching step of contacting the raw material with an aqueous solution of hydrochloric acid to produce an aqueous zinc chloride solution obtained by salinating the zinc component. And removing the iron component and the manganese component in the aqueous zinc chloride solution by contacting the aqueous solution of zinc chloride with the alkaline agent and the oxidizing agent; A substitution step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the manganese component has been separated, and evaporating and concentrating the zinc chloride aqueous solution in which the metal impurity component is reduced and precipitated Using the zinc component as the zinc-containing compound from the zinc chloride aqueous solution from which the iron component and the manganese component are separated; Separating and returning to the deferrous demanganese-removing step, wherein the anhydrous melt-refined zinc chloride producing step dehydrates the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride An eleventh aspect includes a dewatering step, and the zinc metal production step includes an electrolysis step of electrolysis using the anhydrous molten purified zinc chloride as an electrolysis bath.

  Further, in addition to the first aspect of the present invention, the zinc-containing aqueous solution producing step selectively extracts the zinc component from the raw material to produce the zinc-containing aqueous solution, and the zinc And a hydrochloric acid leaching step of contacting an aqueous solution of hydrochloric acid with the residue in the extraction step to form an aqueous zinc chloride solution obtained by chlorinating the zinc component, and the purified zinc chloride production step comprises: Removing iron from the aqueous solution of zinc chloride and separating the iron and manganese components in the aqueous solution of zinc chloride, and a metal nobler than zinc in the aqueous solution of zinc chloride from which the iron and manganese components are separated. A substitution step of reducing and precipitating impurity components, and concentration and evaporation of the aqueous solution of zinc chloride on which the metal impurity components are reductively precipitated to form the purified zinc chloride And zinc separation step of separating the zinc component from the zinc-containing aqueous solution as the zinc-containing compound and returning the zinc component back to the iron removal manganese removal step, wherein the anhydrous melt purified zinc chloride generation step comprises It has a dehydration step of dehydrating zinc in a molten state to form the anhydrous molten purified zinc chloride, and the zinc metal production step has an electrolysis step of electrolysis using the anhydrous molten purified zinc chloride as an electrolytic bath. The twelfth phase.

  In addition to the first aspect of the present invention, the zinc-containing aqueous solution producing step further comprises a hydrochloric acid leaching step of contacting the raw material with an aqueous solution of hydrochloric acid to produce an aqueous zinc chloride solution obtained by salinating the zinc component. And removing the iron component and the manganese component in the aqueous zinc chloride solution by contacting the aqueous solution of zinc chloride with the alkaline agent and the oxidizing agent; Separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step of reducing and precipitating a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the manganese component has been separated, and the substitution step And Z. a zinc separation step, and a zinc chlorination step of salifying the zinc component in the zinc-containing compound to produce purified zinc chloride, The zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous molten purified zinc chloride, and the zinc metal production step uses the anhydrous molten purified zinc chloride as an electrolytic bath It is a thirteenth aspect of the invention to have an electrolytic process of electrolysis.

  Further, in addition to the first aspect of the present invention, the zinc-containing aqueous solution producing step selectively extracts the zinc component from the raw material to produce the zinc-containing aqueous solution, and the zinc And a hydrochloric acid leaching step of contacting an aqueous solution of hydrochloric acid with the residue in the extraction step to form an aqueous zinc chloride solution obtained by chlorinating the zinc component, and the purified zinc chloride production step comprises: Removing iron from the aqueous solution of zinc chloride and separating the iron and manganese components in the aqueous solution of zinc chloride, and a metal nobler than zinc in the aqueous solution of zinc chloride from which the iron and manganese components are separated. A zinc separation process for separating the zinc component as the zinc-containing compound from the aqueous solution of zinc chloride subjected to the substitution process of reducing and precipitating the impurity component and the substitution process And a zinc chlorination step of chlorinating the zinc component in the zinc-containing compound to produce purified zinc chloride, and the anhydrous melt-refined zinc chloride generation step dehydrates the purified zinc chloride in a molten state According to a fourteenth aspect of the present invention, there is provided a dehydration step of producing the anhydrous molten purified zinc chloride, wherein the zinc metal production step comprises an electrolysis step of electrolysis using the anhydrous molten purified zinc chloride as an electrolytic bath.

  In addition to the seventh, eighth, eleventh and twelfth aspects of the present invention, the zinc component in the zinc-containing compound is chlorinated to form purified zinc chloride, and the dehydration step A fifteenth aspect further comprises the step of:

  According to the method of producing zinc ingot according to the first aspect of the present invention, zinc containing zinc as a raw material and secondary dust generated when electric furnace dust or electric furnace dust is reduced by a reduction furnace is used as a raw material A step of producing a zinc-containing aqueous solution for producing an aqueous solution, and using a zinc-containing compound in the form of at least one of a carbonate, a hydroxide and an oxide as a zinc component in the zinc-containing aqueous solution A process for producing purified zinc chloride containing zinc, and an anhydrous, melt-refining chloride for producing anhydrous, melt-refined zinc chloride containing anhydrous, melt-refined zinc chloride, by anodizing the purified zinc chloride Because it comprises a zinc generation step, and a zinc metal formation step of producing zinc metal as an electrolytic product by electrolyzing anhydrous melt-refined zinc chloride. The zinc bullion with a 99.995% equivalent purity of Special high-grade can be mass-produced good yield in a stable manner.

  Further, according to the method of producing zinc metal in the second aspect of the present invention, the step of producing a zinc-containing aqueous solution has a zinc extraction step of selectively extracting a zinc component from a raw material to produce a zinc-containing aqueous solution. And a zinc separation step of separating a zinc component as a zinc-containing compound from a zinc-containing aqueous solution, and a zinc chloride step of salifying the zinc component in the zinc-containing compound to generate purified zinc chloride. And the anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating purified zinc chloride in a molten state to produce anhydrous melt-refined zinc chloride, and the zinc metal production step is an electrolytic bath of anhydrous melt-refined zinc chloride Since it has an electrolysis process to electrolyze as a raw material, priority is given to producing an aqueous solution in which the zinc component is extracted from electric furnace dust or secondary dust as a raw material. Purity equivalent to 99.995% based on the production concept of producing purified zinc chloride using zinc-containing compounds in the form of at least one of carbonates, hydroxides and oxides to produce zinc ingots It is possible to improve the yield and stably mass-produce the zinc metal having.

  Further, according to the method of producing zinc ingot in the third aspect of the present invention, metallic zinc is brought into contact with the zinc-containing aqueous solution generated in the zinc extraction step, and metal impurities nobler than zinc in the zinc-containing aqueous solution Since the method further includes a substitution step of reducing and depositing components, it is possible to stably mass-produce zinc metal having higher purity with high yield.

  Further, according to the method for producing zinc metal in the fourth aspect of the present invention, the oxidizing agent is brought into contact with the zinc-containing aqueous solution produced in the zinc extraction step to separate the iron component and the manganese component in the zinc-containing aqueous solution. The method further comprises: removing iron and removing manganese; and replacing the metal containing zinc with the zinc-containing aqueous solution subjected to the iron removal removing process to reduce and deposit metal impurities more noble than zinc in the zinc-containing aqueous solution. Because of this, it is possible to stably mass-produce zinc metal of higher purity with high yield.

  Further, according to the method for producing zinc metal in the fifth aspect of the present invention, in the zinc chlorination step, a zinc-containing compound is brought into contact with an aqueous solution of hydrochloric acid to produce a purified zinc chloride aqueous solution which is a purified zinc chloride aqueous solution. Together with the step of bringing metal zinc into contact with the purified zinc chloride aqueous solution to reduce and deposit a metal impurity component nobler than zinc in the purified zinc chloride aqueous solution, and evaporating and concentrating the purified zinc chloride aqueous solution subjected to the substitution step Since the method further includes the concentration step, it is possible to stably mass-produce zinc metal of higher purity with high yield.

  Further, according to the method for producing zinc metal in the sixth aspect of the present invention, an oxidizing agent is brought into contact with the purified zinc chloride aqueous solution produced in the zinc chlorination step to obtain an iron component and a manganese component in the zinc chloride aqueous solution. In addition to having a deferrous demanganate step to separate, and in the substitution step, metallic zinc is brought into contact with the purified zinc-containing aqueous solution that has undergone the deferrode demanganese step, so that the zinc metal of higher purity is stabilized with good yield. Mass production.

  Further, according to the method of producing zinc ingot according to the seventh aspect of the present invention, the step of producing a zinc-containing aqueous solution contacts chlorine gas with the raw material and evaporates it to selectively chloride the zinc component to produce zinc chloride. The method includes a selective chlorination step and a dissolution step of dissolving zinc chloride in water to form an aqueous zinc chloride solution, and the purified zinc chloride formation step brings the aqueous zinc chloride solution into contact with an alkali agent and an oxidizing agent to form zinc chloride. De-ferrous demanganese separation process for separating iron component and manganese component in aqueous solution, substitution process for reduction precipitation of metallic impurity component more noble than zinc in zinc chloride aqueous solution from which iron component and manganese component are separated, metallic impurity The zinc chloride aqueous solution from which the components were precipitated by reduction is evaporated and concentrated to form purified zinc chloride, and the zinc component is removed from the zinc chloride aqueous solution from which the iron component and the manganese component are separated. The zinc separation step of separating as a contained compound and returning to the deferrous demanganese-removing step, and the anhydrous melt-refined zinc chloride formation step dehydrates the purified zinc chloride in a molten state to produce anhydrous melt-refined zinc chloride Since the process has a step and the step of producing a zinc metal has an electrolytic step of electrolyzing anhydrous molten refined zinc chloride as an electrolytic bath, zinc chloride as a zinc-containing compound from electric furnace dust or secondary dust as a raw material Is preferentially produced as an aqueous solution, and zinc chloride is purified using a zinc-containing compound of at least one form of carbonate, hydroxide and oxide formed from the zinc component in the raw material to produce zinc metal. Based on the manufacturing concept, it is possible to stably mass-produce zinc metal having a purity equivalent to 99.995% with high yield.

  Further, according to the method of producing zinc metal in the eighth aspect of the present invention, the zinc extraction step of selectively extracting the zinc component from the raw material to form a zinc-containing aqueous solution, and the zinc-containing aqueous solution generation step A selective chlorination step of selectively chlorinating the zinc component by contacting chlorine gas to the residue in the extraction step to selectively form a zinc chloride, and a dissolution step of dissolving zinc chloride in water to form an aqueous zinc chloride solution; Iron removal and manganese removal step of separating the iron component and the manganese component in the zinc chloride aqueous solution by contacting the aqueous solution of zinc chloride with the alkaline agent and the oxidizing agent, and A substitution process for reducing and precipitating a metal impurity component nobler than zinc in the separated aqueous solution of zinc chloride, and evaporation and concentration of the aqueous solution of zinc chloride on which the metal impurity component has been reduced and deposited for purification And a step of separating the zinc component from the zinc-containing aqueous solution as a zinc-containing compound and returning it to the deferrous-demanganese-removing step; Because it has a dehydration step of dehydrating zinc in a molten state to form anhydrous molten purified zinc chloride, and the zinc metal production step has an electrolysis step of electrolysis using anhydrous molten purified zinc chloride as an electrolytic bath, Higher purity zinc metal can be mass-produced stably with high yield.

  Further, according to the method of producing zinc metal in the ninth aspect of the present invention, the step of producing a zinc-containing aqueous solution contacts chlorine gas with a raw material and evaporates it to selectively chloride the zinc component to produce zinc chloride. The method includes a selective chlorination step and a dissolution step of dissolving zinc chloride in water to form an aqueous zinc chloride solution, and the purified zinc chloride formation step brings the aqueous zinc chloride solution into contact with an alkali agent and an oxidizing agent to form zinc chloride. De-ferrous manganese removal process for separating iron component and manganese component in aqueous solution, substitution process for reduction precipitation of metallic impurity component more noble than zinc in zinc chloride aqueous solution from which iron component and manganese component are separated, substitution process Separation step of separating a zinc component as a zinc-containing compound from an aqueous solution of zinc chloride through the step of preparing a zinc chloride step of forming a purified zinc chloride by chlorinating the zinc component in the zinc-containing compound The anhydrous molten purified zinc chloride producing step has a dehydration step of dehydrating purified zinc chloride in a molten state to form anhydrous molten purified zinc chloride, and the zinc metal producing step comprises anhydrous molten purified zinc chloride Since the electrolytic bath has an electrolysis step of electrolysis, it is possible to stably mass-produce zinc metal of higher purity with high yield.

  Further, according to the method of producing zinc ingot according to the tenth aspect of the present invention, the zinc-containing aqueous solution producing step selectively extracts a zinc component from the raw material to produce a zinc-containing aqueous solution; A selective chlorination step of selectively chlorinating the zinc component by contacting chlorine gas to the residue in the extraction step to selectively form a zinc chloride, and a dissolution step of dissolving zinc chloride in water to form an aqueous zinc chloride solution; Iron removal and manganese removal step of separating the iron component and the manganese component in the zinc chloride aqueous solution by contacting the aqueous solution of zinc chloride with the alkaline agent and the oxidizing agent, and Using a zinc-containing compound as a zinc component from a zinc chloride aqueous solution which has undergone a substitution step of reducing and precipitating metal impurity components nobler than zinc in the separated zinc chloride aqueous solution And separating the zinc component in the zinc-containing compound to form purified zinc chloride, wherein the anhydrous melt-refined zinc chloride-producing step dehydrates the purified zinc chloride in a molten state. And a dewatering process for producing anhydrous molten refined zinc chloride, and the zinc metal production process includes an electrolysis process for electrolysis using anhydrous molten refined zinc chloride as an electrolytic bath, so that a zinc metal of higher purity is produced. Gold can be stably mass-produced with higher yield.

  Further, according to the method for producing zinc metal in the eleventh aspect of the present invention, the hydrochloric acid leaching step of producing an aqueous zinc-containing solution comprises contacting the raw material with an aqueous solution of hydrochloric acid to produce an aqueous zinc chloride solution obtained by chlorinating a zinc component. Iron removal and manganese removal step of separating iron and manganese components in an aqueous zinc chloride solution by contacting an aqueous solution of zinc chloride with an alkaline agent and an oxidizing agent, and Step of reducing and precipitating metal impurity components nobler than zinc in the aqueous solution of zinc chloride from which the solution was separated, and concentration step of evaporating and concentrating the aqueous solution of zinc chloride reduced and precipitating the metal impurity components to form purified zinc chloride And a zinc separation step of separating the zinc component as a zinc-containing compound from the zinc chloride aqueous solution from which the iron component and the manganese component have been separated, and returning it to the deironing and The anhydrous molten purified zinc chloride producing step has a dehydration step of dehydrating purified zinc chloride in a molten state to form anhydrous molten purified zinc chloride, and the zinc metal producing step comprises anhydrous molten purified zinc chloride Since it has an electrolysis step of electrolysis as an electrolytic bath, zinc chloride as a zinc-containing compound is preferentially generated as an aqueous solution from electric furnace dust or secondary dust as a raw material, and generated from the zinc component in the raw material Zinc having a purity equivalent to 99.995% based on the production concept of purifying zinc chloride using zinc-containing compounds of at least one form of carbonate, hydroxide and oxide to produce zinc metal. Bar metal can be stably mass-produced with high yield.

  Further, according to the method of producing zinc metal in the twelfth aspect of the present invention, the zinc extraction step of selectively extracting the zinc component from the raw material to form a zinc-containing aqueous solution, and the zinc-containing aqueous solution generation step And a hydrochloric acid leaching step of contacting an aqueous solution of hydrochloric acid with the residue in the extraction step to form an aqueous solution of zinc chloride with the zinc component being chlorinated, wherein the step of producing purified zinc chloride contacts the aqueous solution of zinc chloride with an alkali And separating iron and manganese components in the aqueous solution of zinc chloride, and substitution for reducing and depositing metal impurities more noble than zinc in the aqueous solution of zinc chloride from which the iron and manganese components are separated. Process, a concentration process of evaporating and concentrating an aqueous solution of zinc chloride on which metal impurity components have been reduced and precipitated, and producing purified zinc chloride; The zinc separation step of separating as a contained compound and returning to the deferrous demanganese-removing step, and the anhydrous melt-refined zinc chloride formation step dehydrates the purified zinc chloride in a molten state to produce anhydrous melt-refined zinc chloride Since the process has a step and the step of producing a zinc metal has an electrolysis step of electrolyzing anhydrous molten refined zinc chloride as an electrolytic bath, mass production of zinc metal of higher purity can be stably performed with high yield. it can.

  Further, according to the method of producing zinc metal in the thirteenth aspect of the present invention, the step of producing a zinc-containing aqueous solution is a hydrochloric acid leaching step in which an aqueous solution of hydrochloric acid is brought into contact with the raw material to produce an aqueous solution of zinc chloride with a zinc component Iron removal and manganese removal step of separating iron and manganese components in an aqueous zinc chloride solution by contacting an aqueous solution of zinc chloride with an alkaline agent and an oxidizing agent, and A zinc separation step of separating a zinc component as a zinc-containing compound from a zinc chloride aqueous solution obtained by reduction precipitation of a metal impurity component nobler than zinc in an aqueous zinc chloride solution from which And a process for producing zinc chloride in which the zinc component in the product is salified to produce purified zinc chloride; Zinc having a higher purity because it has a dehydration step of dehydrating to generate anhydrous molten purified zinc chloride, and the zinc metal production step has an electrolysis step of electrolysis using anhydrous molten purified zinc chloride as an electrolytic bath. Bar metal can be stably mass-produced with high yield.

  Further, according to the method for producing zinc metal in the fourteenth aspect of the present invention, the zinc extraction step of selectively extracting the zinc component from the raw material to form a zinc-containing aqueous solution, and the zinc-containing aqueous solution generation step And a hydrochloric acid leaching step of contacting an aqueous solution of hydrochloric acid with the residue in the extraction step to form an aqueous solution of zinc chloride with the zinc component being chlorinated, wherein the step of producing purified zinc chloride contacts the aqueous solution of zinc chloride with an alkali agent and an oxidizing agent. And separating iron and manganese components in the aqueous solution of zinc chloride, and substitution for reducing and depositing metal impurities more noble than zinc in the aqueous solution of zinc chloride from which the iron and manganese components are separated. And zinc separation step of separating the zinc component as a zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step, and the zinc component in the zinc-containing compound is chlorinated to A zinc chlorination step for producing zinc chloride, and the anhydrous melt-refined zinc chloride production step has a dehydration step for dehydrating the purified zinc chloride in a molten state to produce an anhydrous melt-refined zinc chloride; Since the production process has an electrolysis process in which anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath, it is possible to stably mass-produce zinc metal of higher purity with high yield.

  Further, according to the method of producing zinc metal in the fifteenth aspect of the present invention, the method further comprises the step of chlorinating the zinc component in the zinc-containing compound to form purified zinc chloride and sending it to the dehydration step. Because of this, it is possible to stably mass-produce zinc metal of higher purity with high yield.

It is a flowchart of the manufacturing method of the zinc ingot in a 1st embodiment of the present invention. It is process drawing of the manufacturing method of the zinc ingot in the 2nd Embodiment of this invention. It is a flowchart of the manufacturing method of the zinc ingot in a 3rd embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc ingot in a 4th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc ingot in a 5th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc ingot in a 6th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc ingot in a 7th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in the 8th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc ingot in the 9th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in a 10th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc ingot in the 11th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in a 12th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in a 13th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in a 14th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in a 15th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in a 16th embodiment of the present invention. It is a flowchart of the manufacturing method of the zinc metal in a 17th embodiment of the present invention. It is Table 1 which shows the result of the experiment example of the 1st Embodiment of this invention. It is Table 2 which shows the result of the experiment example of the 2nd Embodiment of this invention. It is Table 3 which shows the result of another experiment example of the 2nd Embodiment of this invention. It is Table 4 which shows the result of the experiment example of the 3rd Embodiment of this invention. It is Table 5 which shows the result of the experiment example of the 5th Embodiment of this invention. It is Table 6 which shows the result of the experiment example of the 6th Embodiment of this invention. It is Table 7 which shows the result of the experiment example of the 16th embodiment of this invention.

  Hereinafter, with reference to the drawings as appropriate, the method for producing zinc ingot in each embodiment of the present invention will be described in detail.

First Embodiment
First, with reference to FIG. 1, a method of manufacturing a zinc metal in the first embodiment of the present invention will be described in detail.

  FIG. 1 is a view showing steps of a method of manufacturing a zinc metal according to the present embodiment.

  As shown in FIG. 1, in this embodiment, a zinc extraction step 101, a zinc separation step 102, a zinc chlorination step 103, a dehydration step 104, and an electrolysis step 105 are sequentially performed. The zinc extraction step 101 corresponds to a zinc-containing aqueous solution generation step, the zinc separation step 102 and the zinc chlorination step 103 correspond to a purified zinc chloride generation step, the dehydration step 104 corresponds to an anhydrous melt purified zinc chloride generation step, and an electrolysis step 105 corresponds to the zinc metal production step, giving priority to producing an aqueous solution in which a zinc component is extracted from electric furnace dust or secondary dust as a raw material, and carbonates and water produced from the zinc component in the aqueous solution It is based on the production concept of producing purified zinc chloride using zinc-containing compounds in the form of oxides and at least one of the oxides to produce zinc ingots.

  Specifically, first, in the zinc extraction step 101, electric furnace dust 1 as a raw material containing a zinc-containing compound such as zinc oxide and an iron compound such as iron oxide is brought into direct contact with an aqueous solution of an alkali agent 7 As a zinc extract solution obtained by selectively extracting the zinc component from the zinc-containing compound, an alkaline agent aqueous solution 30 containing the zinc component is generated, and a solid not dissolved in the aqueous solution of the alkaline agent 7 is used as a residue 20.

For example, the chemical formula in the case of obtaining the alkaline agent aqueous solution 30 which selectively extracts the zinc component using sodium hydroxide as the alkaline agent 7 with respect to zinc oxide in the electric furnace dust 1 is shown in the following (Chem. 1) .

  In addition, as a raw material used at the zinc extraction process 101, you may use the secondary dust obtained by reduce | restoring electric furnace dust with a reduction furnace instead of the electric furnace dust 1. As shown in FIG. Moreover, as a raw material used at the zinc extraction process 101, you may use what was obtained by baking only the calcium carbonate to the electric furnace dust 1, and mixing. According to this calcination, the zinc component contained in the zinc ferrite component of the electric furnace dust 1 can be converted to a zinc oxide component which can be easily extracted by the alkaline agent. Also, the carbon dioxide obtained by this calcination can be used in the next zinc separation step 102. In addition, in the zinc extraction step 101, a neutral ammonium salt 29 may be used instead of the alkaline agent 7.

  Next, in the zinc separation step 102, the alkali agent aqueous solution 30 containing the zinc component extracted in the zinc extraction step 101 is brought into contact with carbon dioxide 23, and the alkali containing the zinc component extracted in the zinc extraction step 101 Zinc carbonate 21 is precipitated from the aqueous agent solution 30, solid-liquid separated, and recovered as a solid. The filtrate after solid-liquid separation in the zinc separation step 102 can be repeatedly used as the alkaline agent 7 for selectively extracting the zinc component in the zinc extraction step 101. When neutral ammonium salt 29 is used instead of the alkali agent 7 in the zinc extraction step 101, the filtrate after solid-liquid separation in the zinc separation step 102 selectively selects the zinc component in the zinc extraction step 101. It can be used repeatedly as a neutral ammonium salt 29 for extraction into

For example, as shown in the following chemical formula (Chem. 2), carbon dioxide 23 is blown into the zinc component in the aqueous alkali agent solution 30 represented by the chemical formula (Chem. 1) to precipitate zinc carbonate 21 and thus precipitate. The zinc carbonate 21 is filtered to obtain zinc carbonate 21 as a solid content.

  In the zinc separation step 102, a liquid containing carbonate ions may be used instead of the carbon dioxide 23 brought into contact with the aqueous alkali agent solution 30. Further, in the zinc separation step 102, zinc hydroxide may be deposited instead of or together with zinc carbonate 21 (zinc hydroxide separation step or zinc carbonate / zinc hydroxide separation step). The reason is that zinc carbonate is easily decomposed into zinc hydroxide and carbon dioxide. Also, when zinc carbonate precipitates from the mother liquor, zinc as the target component preferentially precipitates over zinc carbonate that is solid, and there is a purification effect due to the effect of crystallization that leaves the impurity component in the mother liquor. This is because zinc oxide or zinc oxide has the same effect in the process of decomposition in a mother liquor. With regard to zinc hydroxide, when zinc carbonate is used as an alkaline agent, iron and zinc may be coprecipitated and the yield of zinc may be reduced. In order to prevent the precipitation, it is preferable to heat the zinc carbonate to volatilize the carbonate ion component in the zinc carbonate as carbon dioxide, and also to set the zinc component in the zinc carbonate to zinc hydroxide or zinc oxide. is there. Since zinc carbonate tends to become zinc oxide when heated, a part of zinc carbonate may be zinc oxide.

  Next, in the zinc chlorination step 103, the zinc carbonate 21 recovered in the zinc separation step 102 is brought into contact with a chlorination agent 15 such as chlorine or hydrochloric acid to directly chlorinate the zinc carbonate 21 as it is solid to form purified zinc chloride 14 Do. This can reduce the energy cost of dehydration for the production of purified zinc chloride 14.

For example, the chemical formula in the case of using chlorine gas as the chlorination agent 15 for directly chlorinating zinc carbonate 21 is shown by the following (Chemical formula 3).

  When the zinc separation step 102 is replaced with a zinc hydroxide separation step or a zinc carbonate / zinc hydroxide separation step, zinc hydroxide, or zinc hydroxide and zinc carbonate may be correspondingly chlorinated.

  Next, in the dehydration step 104, the purified zinc chloride 14 produced in the zinc chlorination step 103 is heated and melted, and then the melted purified zinc chloride 14 and the chlorine gas 15 are brought into contact and dehydrated. Anhydrous molten purified zinc chloride 14 'was produced, and the remaining water was evaporated water 13.

  Next, in the electrolysis step 105, the anhydrous molten refined zinc chloride 14 'generated in the dehydration step 104 is electrolyzed as a molten salt electrolytic bath to produce a zinc metal 16. In the electrolysis step 105, the molten salt electrolysis method can be carried out using anhydrous molten purified zinc chloride (a melt of anhydrous purified zinc chloride) 14 'generated in the dehydration step 104, so high purity of 4N or more in purity is obtained. Zinc ingot 16 can be manufactured. The chlorine gas 15 obtained by the electrolysis in the electrolysis step 105 can be used as a chlorination agent used in the zinc chlorination step 103 and can be used as a chlorine gas used in the dehydration step 104.

  Furthermore, in the electrolysis step 105, it is incorporated into the zinc metal produced through the electrolysis step of the zinc sulfate aqueous solution carried out in general zinc refining in the anhydrous molten refined zinc chloride 14 'produced in the dehydration step 104. Even if it contains about 10 ppm of easy components such as lead and manganese, the zinc ingot 16 manufactured through the electrolysis process 105 hardly incorporates the components such as lead and manganese, and the lead in the zinc ingot and It has been found that the concentration of manganese etc. can be reduced to less than 2 ppm. One of the reasons for this is considered to be that the retention of lead or the like as an oxide such as lead peroxide in the molten salt electrolytic bath consisting of anhydrous melt-refined zinc chloride 14 ′ is considered as a contributing factor. Furthermore, it is also considered as a factor that the electrolysis of anhydrous molten purified zinc chloride 14 ′ is a high-speed electrolysis having a current density 10 times or more that of the zinc sulfate aqueous solution electrolysis, that is, the reaction rate of zinc deposition is fast.

  In the electrolysis step 105, as the molten salt electrolytic bath, one obtained by mixing and melting an alkali chloride or an alkaline earth chloride with anhydrous molten refined zinc chloride 14 'may be used.

  According to the above method of producing zinc ingot according to the present embodiment, the zinc-containing aqueous solution containing the zinc component in the raw material from the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by the reduction furnace is used as the raw material And a zinc-containing compound in the form of at least one of a carbonate, a hydroxide and an oxide, wherein the zinc component in the zinc-containing aqueous solution is purified using zinc-containing compounds. Process of producing purified zinc chloride containing purified zinc chloride, and anhydrous melt-refined zinc chloride producing anhydrous melt-refined zinc chloride containing anhydrated melt-refined zinc chloride by dehydrating the purified zinc chloride Since it comprises a production step and a zinc metal production step of producing zinc metal as an electrolysis product by electrolyzing anhydrous molten refined zinc chloride, It is possible to stably mass-produce zinc metal having a purity of 99.995% equivalent to high-grade gold with a high yield, and in particular, the zinc-containing aqueous solution forming step selectively extracts the zinc component from the raw material to make the zinc-containing aqueous solution A zinc separation process 102 having a zinc extraction process 101 to be generated and a purified zinc chloride generation process separates a zinc component from a zinc-containing aqueous solution as a zinc-containing compound, and the zinc component in the zinc-containing compound is chlorinated to purify zinc chloride The process for producing zinc chloride includes the steps of: producing a zinc chloride step; producing an anhydrous melt-refined zinc chloride step; dewatering the purified zinc chloride in a molten state to produce an anhydrous melt-refined zinc chloride; Since the production process has an electrolysis process 105 for electrolysis using anhydrous molten purified zinc chloride as an electrolysis bath, it is possible to use electric furnace dust or secondary dust as a raw material? Prioritizing producing an aqueous solution from which a zinc component is extracted, producing zinc chloride purified using a zinc-containing compound in at least one form of carbonate, hydroxide and oxide produced from the zinc component in the aqueous solution Thus, based on the production concept of producing zinc ingot, zinc ingot having a purity of 99.995% can be mass-produced stably with further improved yield.

Second Embodiment
Next, with reference to FIG. 2, a method of manufacturing zinc ingot according to the second embodiment of the present invention will be described in detail.

  FIG. 2: is a figure which shows the process of the manufacturing method of the zinc ingot which concerns on this embodiment.

  In the method of producing zinc ingot according to the present embodiment, compared to the method of producing zinc ingot according to the first embodiment, purified zinc chloride is generated between zinc extraction step 101 and zinc separation step 102. The main difference is that the process has a substitution process (cementation process) 106 as part of the process. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the substitution step 106 following the zinc extraction step 101, the alkali agent aqueous solution 30 containing the zinc component extracted in the zinc extraction step 101 is brought into contact with the metal zinc 9 such as zinc fine particles to make the alkali agent The concentration of impurity components in the aqueous alkali agent solution 30 is reduced by reducing and depositing metal impurity components 10 such as copper, lead, cadmium and the like which are nobler than zinc in the aqueous solution 30.

  Next, in the zinc separation step 102, the alkaline agent aqueous solution 30 'whose concentration of impurity components is reduced in the substitution step 106 is brought into contact with carbon dioxide 23 to precipitate zinc carbonate 21 from the alkaline agent aqueous solution 30'. , It will be solid-liquid separation and recovered as a solid.

  According to the method of producing zinc ingot of the present embodiment described above, in addition to the configuration of the first embodiment, the zinc-containing aqueous solution generated in the zinc extraction step 101 is brought into contact with metallic zinc to Since the method further includes the substitution step 106 for reducing and precipitating the metal impurity component that is nobler than zinc in the medium, the zinc metal having higher purity can be mass-produced stably with high yield.

Third Embodiment
Next, with reference to FIG. 3, a method of manufacturing zinc ingot according to the third embodiment of the present invention will be described in detail.

  FIG. 3: is a figure which shows the process of the manufacturing method of the zinc ingot which concerns on this embodiment.

  In the method of producing zinc ingot according to the present embodiment, compared to the method of producing zinc ingot according to the second embodiment, the step of producing purified zinc chloride is performed between zinc extraction step 101 and substitution step 106. It is a main difference that it has a deferrous-demanganese process 107 as a part of and an additional chlorine absorbing process 108 after the electrolysis process 105. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the iron removal and manganese removal step 107 subsequent to the zinc extraction step 101, in order to remove the iron component and the soluble manganese contained in the alkaline agent aqueous solution 30 containing the zinc component extracted in the zinc extraction step 101, The pH adjustment is carried out by oxidizing the iron or soluble manganese component contained in the aqueous alkali agent solution 30, and the iron component and the manganese component in the aqueous alkali agent solution 30 are separated and removed as sludge 8 of the insoluble precipitate. . Specifically, an oxidizing agent 11 such as a permanganate, chlorate, or chlorine dioxide is added to the aqueous alkali agent solution 30 to oxidize the ferrous iron component in the aqueous alkali agent solution 30 to a ferric iron component and dissolve it. Manganese is converted to insoluble manganese dioxide and separated and removed as sludge 8.

  In addition, when using a permanganate as the oxidizing agent 11, it is possible to supply the permanganate until the excess permanganic acid remains in the aqueous alkali agent solution 30 to determine the end point of the manganese removal, and Permanganic acid is removed by contacting it with activated carbon, converting it into insoluble manganese dioxide.

  Next, in the substitution step 106, the alkali agent aqueous solution 30 ′ ′ in which the concentration of the impurity component is reduced in the iron removal manganese removal step 107 and the metal zinc 9 such as zinc fine particles are brought into contact with each other. The concentration of impurity components in the aqueous alkali agent solution 30 '' is further reduced by reducing and depositing metal impurity components 10 such as copper, lead, cadmium and the like which are nobler than zinc in zinc oxide.

  Further, in the chlorine absorption step 108, sodium hydroxide 7 is made to absorb the chlorine gas 15 obtained by the electrolysis of the electrolysis step 105 to generate sodium hypochlorite 18, which is used as an oxidizing agent in the iron removal manganese removal step 107. be able to.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the second embodiment, the zinc-containing aqueous solution generated in the zinc extraction step 101 is brought into contact with the oxidizing agent to Since the process further includes the deferrous-demanganese-removing step 107 for separating the iron component and the manganese component in the medium, it is possible to stably mass-produce zinc metal of higher purity with high yield.

Fourth Embodiment
Next, with reference to FIG. 4, a method of manufacturing zinc ingot according to a fourth embodiment of the present invention will be described in detail.

  FIG. 4: is a figure which shows the process of the manufacturing method of the zinc ingot which concerns on this embodiment.

  In the method of producing zinc ingot according to the present embodiment, compared with the method of producing zinc ingot according to the first embodiment, an aqueous solution of hydrochloric acid 19 is used as the chlorination agent 15 in the zinc chlorination step 103 The main difference is that a substitution step (cementation step) 109 and a concentration step 110 are included as a part of the purified zinc chloride production step between the zinc chlorination step 103 and the dehydration step 104. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc chlorination step 103, the zinc carbonate 21 recovered in the zinc separation step 102 is brought into contact with an aqueous solution of hydrochloric acid 19 to chlorinate the zinc carbonate 21 to produce an aqueous solution of purified zinc chloride 14.

  Next, in the substitution step 109, the aqueous solution of the purified zinc chloride 14 produced in the zinc chloride step 103 is brought into contact with the metallic zinc 9 such as zinc fine particles to make copper more noble than zinc in the aqueous solution of the purified zinc chloride 14 The metal impurity component 10 such as lead and iron is reduced and precipitated to produce an aqueous solution of purified zinc chloride 14 ′ ′ in which the concentration of the impurity component in the aqueous solution of purified zinc chloride 14 is reduced.

  Next, in the concentration step 110, the aqueous solution of the purified zinc chloride 14 ′ ′ reduced in concentration of the impurity component in the substitution step 109 is evaporated to form the concentrated purified zinc chloride 14 ′ ′ ′ and the remaining water Was the evaporation water 13.

  Next, in the dehydration step 104, the purified zinc chloride 14 ′ ′ ′ produced in the concentration step 110 is heated and melted, and then the molten purified zinc chloride 14 ′ ′ ′ is brought into contact with the chlorine gas 15. It was anhydrated to form anhydrous molten purified zinc chloride 14 ', and the remaining water was evaporated water 13.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the constitution of the first embodiment, in the zinc chlorination step 103, the zinc-containing compound is brought into contact with an aqueous solution of hydrochloric acid to purify the aqueous solution of purified zinc chloride And producing a purified zinc chloride aqueous solution and contacting metal zinc with the purified zinc chloride aqueous solution to reduce and deposit a metal impurity component nobler than zinc in the purified zinc chloride aqueous solution; Since the method further includes the concentration step 110 of evaporating and concentrating the purified zinc chloride aqueous solution, it is possible to stably mass-produce zinc metal of higher purity with high yield.

Fifth Embodiment
Next, with reference to FIG. 5, a method of manufacturing a zinc metal in the fifth embodiment of the present invention will be described in detail.

  FIG. 5: is a figure which shows the process of the manufacturing method of the zinc ingot which concerns on this embodiment.

  The method for producing zinc ingot according to the present embodiment is a step of producing purified zinc chloride between the zinc chlorination step 103 and the replacement step 109 in comparison with the method for producing zinc ingot according to the fourth embodiment. The main difference is that it has a deferrous-demanganate process 111 as a part of and an additional chlorine absorption process 108 after the electrolysis process 105. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the iron removal and manganese removal step 111 subsequent to the zinc chloride step 103, the iron component and soluble manganese contained in the aqueous solution of purified zinc chloride 14 containing the zinc component generated in the zinc chloride step 103 are removed. The pH adjustment is carried out by oxidizing the iron or soluble manganese component contained in the aqueous solution of such purified zinc chloride 14 and the sludge of the precipitate in which the iron and manganese components in the aqueous solution of purified zinc chloride 14 are insoluble Separately as 8 to obtain purified zinc chloride 14 ''. Specifically, an oxidizing agent 11 such as a permanganate, chlorate, or chlorine dioxide is added to the aqueous alkali agent solution 30 to oxidize the ferrous iron component in the aqueous alkali agent solution 30 to a ferric iron component and dissolve it. Manganese is converted to insoluble manganese dioxide and separated and removed as sludge 8.

  When permanganate is used as the oxidizing agent 11, the end point of the manganese removal can be determined by supplying the permanganate until the excess permanganic acid remains in the aqueous solution of purified zinc chloride 14. The remaining permanganic acid is removed by contacting it with activated carbon to convert it into insoluble manganese dioxide.

  Next, in the substitution step 109, the aqueous solution of purified zinc chloride 14 '' via the iron removal manganese removal step 111 is brought into contact with metallic zinc 9 such as zinc fine particles, and zinc in the aqueous solution of purified zinc chloride 14 ''. More noble metal impurities 10 such as copper, lead, cadmium and the like are reduced and precipitated to obtain purified zinc chloride 14 ′ ′ ′ having a reduced concentration of impurity components in an aqueous solution of purified zinc chloride 14 ′ ′.

  Next, in the concentration step 110, the aqueous solution of the purified zinc chloride 14 '' 'passed through the substitution step 109 is evaporated to form a concentrated purified zinc chloride 14' ''.

  Next, in the dehydration step 104, the purified zinc chloride 14 "" through the concentration step 110 is heated and melted, and then the molten purified zinc chloride 14 "" is contacted with the chlorine gas 15 The reaction is dried and anhydrous to produce anhydrous molten purified zinc chloride 14 '.

  In the chlorine absorption step 108, sodium hydroxide 7 is made to absorb the chlorine gas 15 obtained by the electrolysis in the electrolysis step 105 to generate sodium hypochlorite 18, and it is used as an oxidizing agent in the iron removal manganese removal step 111. be able to.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the constitution of the fourth embodiment, the oxidizing agent is brought into contact with the purified zinc chloride aqueous solution generated in the zinc chlorination step 103 In addition to the deferrous demanganese removal step 111 for separating the iron component and the manganese component in the aqueous solution, and in the substitution step 109, metallic zinc is brought into contact with the purified zinc-containing aqueous solution subjected to the deferrous demanganese removal step. High purity zinc metal can be mass-produced stably with high yield.

Sixth Embodiment
Next, with reference to FIG. 6, a method of manufacturing a zinc metal in the sixth embodiment of the present invention will be described in detail.

  FIG. 6 is a view showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  As shown in FIG. 6, in the present embodiment, the selective chlorination step 201, the dissolution step 202, the iron removal and manganese removal step 203, the zinc separation step 204, the alkali regeneration step 205, the substitution step 206, the concentration step 207, the dehydration step 208, The electrolysis step 209 and the chlorine absorption step 210 are performed. The selective chlorination step 201 and the dissolution step 202 correspond to the zinc-containing aqueous solution production step, and the deferrous-manganese removal step 203, the zinc separation step 204, the substitution step 206 and the concentration step 207 correspond to the purified zinc chloride production step, the dehydration step 208 Is equivalent to the anhydrous melt-refined zinc chloride formation step, and the electrolysis step 209 is equivalent to the zinc metal formation step, in which zinc chloride as a zinc-containing compound is preferentially used as an aqueous solution from electric furnace dust or secondary dust as a raw material. Based on the production concept, zinc chloride is purified to form zinc ingot using zinc-containing compounds that are formed and formed from zinc component in the raw material and at least one form of carbonate, hydroxide and oxide. ing. The alkali regeneration step 205 and the chlorine absorption step 210 are additional steps.

  Specifically, first, in the selective chlorination step 201, electric furnace dust 1 as a raw material containing a zinc-containing compound such as zinc oxide and an iron compound such as iron oxide, chlorine gas 15, and air 17 as an oxygen-containing gas A mixed gas of the following is directly contacted at high temperature to chlorinate the electric furnace dust 1, to form crude zinc chloride 3 and oxygen gas 2 which are mainly composed of The residue 4 mainly contains iron oxide. From the viewpoint of simplifying the selective chlorination step 201, only the chlorine gas 15 may be used instead of the mixed gas of the chlorine gas 15 and the air 17 which is an oxygen-containing gas. Further, as the raw material used in the selective chlorination step 201, instead of the electric furnace dust 1, a secondary dust obtained by reducing the electric furnace dust in a reduction furnace may be used.

  Next, in the dissolving step 202, the crude zinc chloride 3 produced in the selective chlorination step 201 is dissolved in water 13 such as demineralized water to form an aqueous solution of zinc chloride 6, and the solid separated by suction and filtration. The portion was taken as insoluble sludge 5 mainly composed of lead chloride and ferric oxide (hematite).

  Next, in the iron removal iron removal step 203, the alkali agent 7 such as caustic or alkaline ammonia water is added to the zinc chloride aqueous solution 6 generated in the dissolution step 202 to adjust the pH, and chloride in the zinc chloride aqueous solution 6 is prepared. The ferric iron component is separated and removed as an insoluble precipitate such as hydroxide or oxide, and an oxidizing agent 11 such as permanganate, chlorate or chlorine dioxide is added to the aqueous zinc chloride solution 6 Then, soluble manganese in the aqueous zinc chloride solution 6 is oxidized, converted to insoluble manganese dioxide, and separated and removed. In addition, about this alkaline agent 7, it may replace with addition of a caustic alkali or ammonia water, and you may perform contact with ammonia gas, or addition of calcium hydroxide, calcium carbonate, magnesium hydroxide etc. may be performed.

  Here, pH adjustment for deferring may be carried out with an alkaline agent and chlorine, an alkaline agent and hypochlorite (eg, sodium hypochlorite as a food additive), or alkaline hypochlorite 18 If addition is carried out, it is possible not only to be able to simultaneously carry out defermentation and manganese removal but also to make the insoluble iron-containing precipitate into a well-filtered hydrated iron oxide. Further, when a permanganate is used as the oxidizing agent 11, it is possible to determine the end point of manganese removal by supplying the permanganate until the excess permanganic acid remains in the aqueous alkali agent solution 30, and Permanganic acid is removed by contacting it with activated carbon, converting it into insoluble manganese dioxide.

  Next, in the substitution step 206, the zinc chloride aqueous solution 6 'whose concentration of the impurity component is reduced in the iron removal manganese removal step 203 is brought into contact with metallic zinc 9 such as zinc fine particles to make copper more noble than zinc. The metal impurity component 10 such as lead and cadmium is reductively precipitated to further reduce the concentration of the impurity component in the zinc chloride aqueous solution 6 ′.

  Next, in the concentration step 207, the zinc chloride aqueous solution 6 ′ ′ whose concentration of impurity components is reduced in the substitution step 206 is evaporated to form purified zinc chloride 14 and the remaining water is evaporated water 13 did. Further, the evaporation water 13 is returned to the dissolving step 202.

  Next, in the dehydration step 208, the molten purified zinc chloride 14 produced in the concentration step 207 and the chlorine gas 15 are brought into contact with each other for dehydration, thereby producing anhydrous molten purified zinc chloride 14 'and The remaining water was evaporated water 13. Further, the evaporation water 13 is returned to the dissolving step 202.

  Next, in the electrolysis step 209, the anhydrous molten purified zinc chloride 14 'generated in the dehydration step 208 is electrolyzed as a molten salt electrolytic bath to form the zinc metal 16. The other contents in the electrolysis step 209 are the same as the electrolysis step 105 in the first to fifth embodiments.

  Here, in the zinc separation step 204, the zinc chloride aqueous solution 6 'whose concentration of impurity components has been reduced in the iron removal manganese removal step 203 and sodium carbonate as the alkali agent 7 are brought into contact with each other to form zinc chloride aqueous solution 6'. Zinc carbonate 21 is precipitated, solid-liquid separated and recovered as a solid, and returned to the deferrous-manganese removal step 203, whereby zinc carbonate 21 is used as an alkali agent and the alkali agent component is left in the zinc chloride aqueous solution It is possible to increase the concentration of the zinc component in the aqueous zinc chloride solution 6 'without. At this time, sodium carbonate used as the alkali agent 7 may be used as the alkali agent 7 in the iron removal demanganese step 203. In the zinc separation step 204, zinc hydroxide may be deposited instead of or together with zinc carbonate 21 (zinc hydroxide separation step or zinc carbonate / zinc hydroxide separation step).

  In addition, in the alkali regeneration step 205, ammonium carbonate 24 is added to the filtrate 22 mainly composed of sodium chloride from which zinc carbonate is separated in the zinc separation step 204 to precipitate sodium carbonate and separate it from solid-liquid separation The solid solution is recovered as a solid and returned to the zinc separation step 204 as the alkali agent 7, and the filtrate 25 after solid-liquid separation is discharged. When ammonium chloride is contained in the filtrate 25, an alkali agent may be added to the ammonium chloride, and stripping may be performed in a stripping step to collect and collect the ammonia component in a process requiring an ammonia component.

  Further, in the chlorine absorbing step 210, as in the chlorine absorbing step 108 of the third and fifth embodiments, sodium hydroxide 7 is made to absorb the chlorine gas 15 obtained by the electrolysis of the electrolytic step 209, thereby sodium hypochlorite 18 can be produced and used as an oxidant in the deferrous demanganese step 203.

  According to the above method of producing zinc ingot according to the present embodiment, the zinc-containing aqueous solution containing the zinc component in the raw material from the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by the reduction furnace is used as the raw material And a zinc-containing compound in the form of at least one of a carbonate, a hydroxide and an oxide, wherein the zinc component in the zinc-containing aqueous solution is purified using zinc-containing compounds. Process of producing purified zinc chloride containing purified zinc chloride, and anhydrous melt-refined zinc chloride producing anhydrous melt-refined zinc chloride containing anhydrated melt-refined zinc chloride by dehydrating the purified zinc chloride Since it comprises a production step and a zinc metal production step of producing zinc metal as an electrolysis product by electrolyzing anhydrous molten refined zinc chloride, It is possible to stably mass-produce zinc metal having a purity of 99.995% equivalent to char high grade, and in particular, the zinc-containing aqueous solution producing step selectively contacts the raw material with chlorine gas to evaporate and selectively use the zinc component. And a dissolving step 202 for dissolving zinc chloride in water to produce an aqueous solution of zinc chloride, wherein the step of producing purified zinc chloride is an alkaline agent to the aqueous solution of zinc chloride Of iron and manganese components in zinc chloride aqueous solution by contacting iron and oxidizing agent, and metal impurities nobler than zinc in zinc chloride aqueous solution from which iron and manganese components are separated And the substitution step 206 for reducing and precipitating the components, and evaporating and concentrating the aqueous solution of zinc chloride on which the metal impurity components are reduced for precipitation to form purified zinc chloride And a zinc separation step 204 for separating the zinc component as a zinc-containing compound from an aqueous solution of zinc chloride from which the iron component and the manganese component are separated, and returning it to the iron removal and manganese removal step. The step includes a dehydration step 208 of dewatering purified zinc chloride in a molten state to form anhydrous molten refined zinc chloride, and the zinc metal production step electrolyzes the electrolytic process using anhydrous molten refined zinc chloride as an electrolytic bath. Since zinc oxide as a zinc-containing compound is preferentially generated as an aqueous solution from electric furnace dust as a raw material or secondary dust, carbonates, hydroxides and oxides formed from the zinc component in the raw material Equivalent of 99.995% based on the production concept of purifying zinc chloride to produce zinc ingots using at least one form of zinc-containing compound It is possible to stably mass-produce zinc metal having a purity of at a high yield.

Seventh Embodiment
Next, with reference to FIG. 7, a method of manufacturing a zinc metal in the seventh embodiment of the present invention will be described in detail.

  FIG. 7 is a view showing the steps of the method of manufacturing a zinc ingot according to the present embodiment.

  As compared with the method of manufacturing a zinc metal according to the sixth embodiment, the method of manufacturing a zinc metal according to the present embodiment has a zinc chlorination step 211 after the zinc separation step 204. , The main difference. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc chlorination step 211 subsequent to the zinc separation step 204, the zinc carbonate 21 recovered in the zinc separation step 204 is brought into contact with the chlorination agent 15 to produce purified zinc chloride 14 and purified zinc chloride 14 To the dehydration step 208. The other contents of the zinc chlorination step 211 are the same as those of the zinc chlorination step 103 in the first to fifth embodiments. In addition, the zinc separation step 204 may, if necessary, send the zinc carbonate 21 to the zinc chlorination step 211 without returning it to the iron removal demanganese step 203.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the sixth embodiment, the zinc component in the zinc-containing compound obtained in the zinc separation step 204 is salified to produce purified zinc chloride Is produced and is sent to the dehydration step 208, the zinc metal of higher purity can be mass-produced stably with higher yield.

Eighth Embodiment
Next, with reference to FIG. 8, a method of manufacturing zinc ingot in the eighth embodiment of the present invention will be described in detail.

  FIG. 8 is a view showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  The method for producing zinc ingot according to the present embodiment has a zinc extraction step 212 at the previous stage of the selective chlorination step 201, as compared with the method for producing zinc ingot according to the sixth embodiment, along with this. The main difference is that the zinc separation step 213 is provided after the zinc extraction step 212 and the alkali regeneration step 205 is not provided. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc extraction step 212, electric furnace dust 1 as a raw material containing a zinc-containing compound such as zinc oxide and an iron compound such as iron oxide is brought into direct contact with an aqueous solution of an alkali agent 7; As a zinc extract obtained by selectively extracting the zinc component from the zinc-containing compound, an alkaline agent aqueous solution 30 containing the zinc component is generated, and solid content not dissolved in the aqueous solution of the alkaline agent 7 is defined as the residue 20. The other contents in the zinc extraction step 212 are the same as the zinc extraction step 101 in the first to fifth embodiments.

  Next, in the selective chlorination step 201, the residue 20 generated in the zinc extraction step 212 and the mixed gas of the chlorine gas 15 and the air 17 which is an oxygen-containing gas are brought into direct contact at high temperature to chlorinate the electric furnace dust 1 The solid content which is mainly composed of a zinc chloride component and generates crude zinc chloride 3 and oxygen gas 2 which are vapors, and which is non-volatile is regarded as a residue 4 mainly composed of iron oxide.

  On the other hand, in the zinc separation step 213, the alkali agent aqueous solution 30 containing the zinc component extracted in the zinc extraction step 212 is brought into contact with carbon dioxide 23, and the alkali containing the zinc component extracted in the zinc extraction step 212 Zinc carbonate 21 is precipitated from the aqueous agent solution 30, solid-liquid separated, recovered as a solid, and sent to the iron removal demanganese step 302. The filtrate after solid-liquid separation in the zinc separation step 213 can be repeatedly used as the alkaline agent 7 for selectively extracting the zinc component in the zinc extraction step 212. The other contents in the zinc separation step 213 are the same as the zinc separation steps 102 and 204 in the first to seventh embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the sixth embodiment, the zinc component is selectively extracted from the raw material in the former stage of the selective chlorination step 201 to obtain the zinc-containing aqueous solution And zinc separation step 213 for separating the zinc component from the zinc-containing aqueous solution as a zinc-containing compound and returning it to the deferrous It can be mass-produced stably with good yield.

The ninth embodiment
Next, with reference to FIG. 9, a method of manufacturing a zinc metal in the ninth embodiment of the present invention will be described in detail.

  FIG. 9 is a view showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  The method of producing a zinc metal according to the present embodiment has a zinc chlorination step 214 after the zinc separation step 213, as compared with the method of producing a zinc metal according to the eighth embodiment. , The main difference. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc chlorination step 214 subsequent to the zinc separation step 213, the zinc carbonate 21 recovered in the zinc separation step 213 is brought into contact with the chlorination agent 15 to produce purified zinc chloride 14 and purified zinc chloride 14 To the dehydration step 208. The other contents in the zinc chlorination step 214 are the same as the zinc chlorination steps 103 and 211 in the first to fifth and seventh embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the constitution of the eighth embodiment, the zinc component in the zinc-containing compound obtained in the zinc separation step 213 is salified to produce purified zinc chloride Can be produced and sent to the dehydration step 208, so that the zinc metal of higher purity can be mass-produced stably with higher yield.

Tenth Embodiment
Next, with reference to FIG. 10, a method of manufacturing zinc ingot according to the tenth embodiment of the present invention will be described in detail.

  FIG. 10 is a view showing the steps of the method of manufacturing a zinc ingot according to the present embodiment.

  The method for producing zinc metal according to the present embodiment is different from the method for producing zinc metal according to the sixth embodiment in the zinc separation step 215 and the zinc chlorination step between the substitution step 206 and the dehydration step 208. It is the main difference that it has 216, the concentration process 207 is omitted accompanying this, and the alkali regeneration process 217 is additionally provided. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc separation step 215 subsequent to the substitution step 206, the zinc chloride aqueous solution 6 ′ ′ whose concentration of impurity components is reduced in the substitution step 206 is brought into contact with sodium carbonate as the alkali agent 7 Zinc carbonate 21 is precipitated from the aqueous solution of zinc chloride 6 ′ ′ and solid-liquid separated to recover it as a solid. The other contents in the zinc separation step 215 are the same as the zinc separation steps 102, 204 and 213 in the first to ninth embodiments.

  Next, in the zinc chlorination step 216, the zinc carbonate 21 recovered in the zinc separation step 215 is brought into contact with chlorine gas as the chlorinating agent 15 to chlorinate the zinc carbonate 21 to form purified zinc chloride 14. The other contents in the zinc chlorination process 216 are the same as the zinc chlorination processes 103, 211, and 214 in the first to fifth, seventh, and ninth embodiments.

  Further, in the alkali regeneration step 217, ammonium carbonate 24 is added to the filtrate 22 mainly composed of sodium chloride after zinc carbonate is separated in the zinc separation step 215 to precipitate sodium carbonate and separate it from the solid solution. The solid 25 is recovered as a solid and returned to the iron removal step 203 and the zinc separation step 215 as the alkali agent 7, and the filtrate 25 after solid-liquid separation is discharged. The other contents in the alkali regeneration step 217 are the same as the alkali regeneration step 205 in the sixth and seventh embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the sixth embodiment, in the purified zinc chloride production step, the zinc separation step 215 is carried out from the aqueous solution of zinc chloride through the substitution step 206. The zinc component is separated as a zinc-containing compound, and the zinc component in the zinc-containing compound is chlorinated to form purified zinc chloride, and thus the zinc metallurgical process of higher purity is further achieved. It can be mass-produced well well.

Eleventh Embodiment
Next, with reference to FIG. 11, a method of manufacturing zinc ingot according to the eleventh embodiment of the present invention will be described in detail.

  FIG. 11 is a view showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  The method for producing zinc ingot according to the present embodiment is mainly different from the method for producing zinc ingot according to the tenth embodiment in having the zinc extraction step 212 at the front stage of the selective chlorination step 201. It is a point. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc extraction step 212, electric furnace dust 1 as a raw material containing a zinc-containing compound such as zinc oxide and an iron compound such as iron oxide is brought into direct contact with an aqueous solution of an alkali agent 7; As a zinc extract obtained by selectively extracting the zinc component from the zinc-containing compound, an alkaline agent aqueous solution 30 containing the zinc component is generated, and solid content not dissolved in the aqueous solution of the alkaline agent 7 is defined as the residue 20. Here, the residue 20 is sent to the selective chlorination step 201.

  Next, in the selective chlorination step 201, the residue 20 generated in the zinc extraction step 212 and the mixed gas of the chlorine gas 15 and the air 17 which is an oxygen-containing gas are brought into direct contact at high temperature to chlorinate the electric furnace dust 1 The solid content which is mainly composed of a zinc chloride component and generates crude zinc chloride 3 and oxygen gas 2 which are vapors, and which is non-volatile is regarded as a residue 4 mainly composed of iron oxide.

  On the other hand, in the zinc separation step 213, the alkali agent aqueous solution 30 containing the zinc component extracted in the zinc extraction step 212 is brought into contact with carbon dioxide 23, and the alkali containing the zinc component extracted in the zinc extraction step 212 Zinc carbonate 21 is precipitated from the aqueous agent solution 30, solid-liquid separated, recovered as a solid, and sent to the iron removal demanganese step 203. The filtrate after solid-liquid separation in the zinc separation step 213 can be repeatedly used as the alkaline agent 7 for selectively extracting the zinc component in the zinc extraction step 212. The other contents in the zinc separation step 213 are the same as the zinc separation steps 102 and 204 in the first to seventh embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the tenth embodiment, the zinc component is selectively extracted from the raw material in the former stage of the selective chlorination step 201 to obtain the zinc-containing aqueous solution Since the zinc extraction step 212 is performed to produce H.sup.2, it is possible to stably mass-produce zinc metal of higher purity with high yield.

Twelfth Embodiment
Next, with reference to FIG. 12, a method of producing a zinc metal in accordance with a twelfth embodiment of the present invention will be described in detail.

  FIG. 12 is a diagram showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  As shown in FIG. 12, the method of producing a zinc ingot according to the present embodiment is different from the method of producing a zinc ingot according to the sixth embodiment in the selective chlorination step 201 and the sixth embodiment. The dissolution process 202 is replaced with a hydrochloric acid leaching process 301.

  That is, in this embodiment, the hydrochloric acid leaching step 301, the deferrous-demanganese step 302, the zinc separation step 303, the alkali regeneration step 304, the substitution step 305, the concentration step 306, the dehydration step 307, the electrolysis step 308 and the chlorine absorbing step 309 Run. The hydrochloric acid leaching step 301 corresponds to a zinc-containing aqueous solution production step, the deferrous demanganese removal step 302, the zinc separation step 303, the substitution step 305 and the concentration step 306 correspond to a purified zinc chloride production step, and the dehydration step 307 is an anhydrous melting purification The electrolysis step 308 corresponds to the zinc chloride formation step, and zinc chloride as the zinc-containing compound is preferentially generated as an aqueous solution from electric furnace dust or secondary dust as a raw material, It is based on the manufacturing concept of purifying zinc chloride using zinc-containing compounds in the form of at least one of a carbonate and a hydroxide formed from a zinc component in a raw material to form zinc ingot. The alkali regeneration step 304 and the chlorine absorption step 309 are additional steps.

  Specifically, first, in the hydrochloric acid leaching step 301, electric furnace dust 1 as a raw material containing a zinc-containing compound such as zinc oxide and an iron compound such as iron oxide is brought into direct contact with an aqueous solution of hydrochloric acid 19 The electric furnace dust 1 was chlorinated to form a zinc chloride aqueous solution 6 mainly composed of a zinc chloride component and an iron chloride component, and a solid not dissolved in an aqueous solution of hydrochloric acid 19 was used as a residue 20. In addition, as a raw material used at the hydrochloric acid leaching process 301, you may use the secondary dust obtained by reduce | restoring electric furnace dust with a reduction furnace instead of the electric furnace dust 1. As shown in FIG.

  Next, in the iron removal and manganese removal step 302, an alkali agent 7 such as caustic or ammonia water is added to the aqueous solution of zinc chloride 6 produced in the hydrochloric acid leaching step 301 to adjust the pH, and chloride in the aqueous solution of zinc chloride 6 is obtained. The ferric iron component is separated and removed as an insoluble precipitate such as hydroxide or oxide, and an oxidizing agent 11 such as permanganate, chlorate or chlorine dioxide is added to the aqueous zinc chloride solution 6 Then, soluble manganese in the aqueous zinc chloride solution 6 is oxidized, converted into insoluble manganese dioxide, and separated and removed. The other contents of the deferrous and demanganese process 302 are the same as the deferrous and demanganese processes 107, 111 and 203 in the third and fifth to ninth embodiments.

  The substitution step 305, the concentration step 306, the dehydration step 307, the electrolysis step 308, and the chlorine absorption step 309 of the deferrous and manganese removal step 302 and subsequent steps are the substitution steps 106, 109 and 206 in the second to eleventh embodiments. Concentration steps 110 and 207 in the fourth to ninth embodiments, dehydration steps 104 and 208 in the first to eleventh embodiments, electrolysis steps 105 and 209 in the first to eleventh embodiments, and third and fifth And the zinc separation step 303 and the alkali regeneration step 304 are the same as the zinc separation steps 102, 204, 213, and 215 of the first to eleventh embodiments, and the same as the chlorine absorption steps 108 and 210 in the eleventh embodiment. This is the same as the alkali regeneration steps 205 and 217 in the sixth, seventh, tenth and eleventh embodiments.

  According to the above method of producing zinc ingot of the present embodiment, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by the reduction furnace is used as a raw material to form a zinc-containing aqueous solution containing the zinc component in the raw material And a zinc-containing compound in the form of at least one of a carbonate, a hydroxide and an oxide, and containing zinc chloride purified while using the zinc-containing compound. Step of producing purified zinc chloride to produce purified zinc chloride, and step of producing anhydrous dry purified zinc chloride to produce anhydrous molten refined zinc chloride containing anhydrated molten refined zinc chloride by dehydrating purified zinc chloride And a process for producing zinc metal that produces zinc metal as an electrolytic product by electrolyzing anhydrous melt-refined zinc chloride; It is possible to stably mass-produce zinc ingot having a purity equivalent to 99.995% of grade with high yield, and in particular, the zinc-containing aqueous solution forming step made the raw material contact the aqueous solution of hydrochloric acid to chlorinate the zinc component It has a hydrochloric acid leaching step 301 for producing an aqueous solution of zinc chloride, and a purified zinc chloride production step brings iron chloride and an aqueous solution into contact with an aqueous solution of zinc chloride to separate iron and manganese components in the aqueous solution of zinc chloride. A manganese removal step 302, a substitution step 305 for reducing and precipitating a metal impurity component nobler than zinc in an aqueous solution of zinc chloride from which an iron component and a manganese component are separated, and a zinc chloride aqueous solution from which a metal impurity component is reduced and precipitated And concentrate to form purified zinc chloride, and the zinc component is extracted from the aqueous solution of zinc chloride from which the iron component and the manganese component are separated. A zinc separation step 303 which is separated as a contained compound and returned to the deferrous demanganese step 302, and the anhydrous melt-refined zinc chloride formation step dehydrates the purified zinc chloride in a molten state to produce anhydrous melt-refined zinc chloride Since it has a dewatering process 307 and a zinc metal production process has an electrolysis process 308 for electrolytically decomposing anhydrous molten refined zinc chloride as an electrolytic bath, it can be used as a zinc-containing compound from electric furnace dust or secondary dust as a raw material Zinc chloride is preferentially produced as an aqueous solution, and zinc chloride is purified using a zinc-containing compound in the form of at least one of a carbonate and a hydroxide formed from the zinc component in the raw material to form zinc ingot Based on the manufacturing concept, it is possible to stably mass-produce zinc metal having a purity equivalent to 99.995% with high yield.

Thirteenth Embodiment
Next, with reference to FIG. 13, a method of producing zinc ingot in the thirteenth embodiment of the present invention will be described in detail.

  FIG. 13 is a view showing the steps of the method of manufacturing a zinc ingot according to the present embodiment.

  The method for producing zinc ingot according to the present embodiment has a zincation step 310 subsequent to the zinc separation step 303, as compared with the method for producing zinc ingot according to the twelfth embodiment. , The main difference. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc chlorination step 310 subsequent to the zinc separation step 303, the zinc carbonate 21 recovered in the zinc separation step 303 is brought into contact with the chlorination agent 15 to produce purified zinc chloride 14 and purified zinc chloride 14 To the dehydration step 307. The other contents in the zinc chlorination process 310 are the same as the zinc chlorination processes 103, 211, 214, and 216 in the first to fifth, seventh, and ninth to eleventh embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the constitution of the twelfth embodiment, the zinc component in the zinc-containing compound obtained in the zinc separation step 303 is salified to produce purified zinc chloride Can be produced and sent to the dehydration step 307, so that the zinc metal of higher purity can be mass-produced stably with higher yield.

Fourteenth Embodiment
Next, with reference to FIG. 14, a method of manufacturing zinc ingot according to a fourteenth embodiment of the present invention will be described in detail.

  FIG. 14 is a view showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  The method of producing a zinc metal according to the present embodiment has a zinc extraction step 311 at a stage prior to the hydrochloric acid leaching step 301, as compared to the method of producing a zinc metal according to the twelfth embodiment, The main difference is that the zinc separation step 312 is provided after the zinc extraction step 311 and the alkali regeneration step is not provided. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc extraction step 311, the electric furnace dust 1 as a raw material containing a zinc-containing compound such as zinc oxide and an iron compound such as iron oxide is brought into direct contact with an aqueous solution of an alkali agent 7 As a zinc extract obtained by selectively extracting the zinc component from the zinc-containing compound, an alkaline agent aqueous solution 30 containing the zinc component is generated, and solid content not dissolved in the aqueous solution of the alkaline agent 7 is defined as the residue 20. The other contents in the zinc extraction step 311 are the same as the zinc extraction steps 101 and 212 in the first to fifth, eighth, ninth and eleventh embodiments.

  Next, in the hydrochloric acid leaching step 301, the residue 20 produced in the zinc extraction step 311 is brought into direct contact with the aqueous solution of hydrochloric acid 19 to chlorinate the electric furnace dust 1, and a zinc chloride aqueous solution 6 mainly comprising a zinc chloride component A solid that does not dissolve in an aqueous solution of hydrochloric acid 19 while being produced is referred to as a residue 20.

  On the other hand, in the zinc separation step 312, the alkali agent aqueous solution 30 containing the zinc component extracted in the zinc extraction step 311 is brought into contact with carbon dioxide 23, and the alkali containing the zinc component extracted in the zinc extraction step 311 Zinc carbonate 21 is precipitated from the aqueous agent solution 30, solid-liquid separated, recovered as a solid, and sent to the iron removal demanganese step 302. The filtrate after solid-liquid separation in the zinc separation step 312 can be repeatedly used as the alkaline agent 7 for selectively extracting the zinc component in the zinc extraction step 311. The other contents in the zinc separation step 312 are the same as the zinc separation steps 102, 204, 213, 215, and 303 in the first to thirteenth embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the thirteenth embodiment, the zinc component is selectively extracted from the raw material in the former stage of the hydrochloric acid leaching step 301, and the zinc-containing aqueous solution is extracted. And zinc separation step 312 for separating zinc components from a zinc-containing aqueous solution as zinc-containing compounds and returning them to the deferrous It can be mass-produced stably with good yield.

(Fifteenth Embodiment)
Next, with reference to FIG. 15, a method of manufacturing a zinc metal in accordance with a fifteenth embodiment of the present invention will be described in detail.

  FIG. 15 is a diagram showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  The method for producing zinc ingot according to the present embodiment has a zincation step 313 subsequent to the zinc separation step 312 as compared with the method for producing zinc ingot according to the fourteenth embodiment. , The main difference. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc chlorination step 313 subsequent to the zinc separation step 312, the zinc carbonate 21 recovered in the zinc separation step 312 is brought into contact with the chlorination agent 15 to produce purified zinc chloride 14 and purified zinc chloride 14 To the dehydration step 307. The other contents in the zinc chlorination step 313 are the same as the zinc chlorination steps 103, 211, 214, 216, and 310 in the first to fifth, seventh, ninth, eleventh and thirteenth embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the constitution of the fourteenth embodiment, the zinc component in the zinc-containing compound obtained in the zinc separation step 312 is salified to produce purified zinc chloride Can be produced and sent to the dehydration step 307, so that the zinc metal of higher purity can be mass-produced stably with higher yield.

Sixteenth Embodiment
Next, with reference to FIG. 16, a method of manufacturing a zinc metal in accordance with a sixteenth embodiment of the present invention will be described in detail.

  FIG. 16 is a diagram showing steps of the method of manufacturing a zinc metal according to the present embodiment.

  The method for producing zinc ingot according to the present embodiment is different from the method for producing zinc ingot according to the twelfth embodiment in that the zinc separation step 314 and the zinc chlorination step are performed between the substitution step 305 and the dehydration step 307. It is the main difference that it has 315, the concentration step 306 is omitted correspondingly, and additionally an alkali regeneration step 316 is provided. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc separation step 314 subsequent to the substitution step 305, the zinc chloride aqueous solution 6 ′ ′ whose concentration of impurity components is reduced in the substitution step 305 is brought into contact with sodium carbonate as the alkali agent 7 Zinc carbonate 21 is precipitated from the aqueous solution of zinc chloride 6 ′ ′ and solid-liquid separated to recover it as a solid. The other contents in the zinc separation step 314 are the same as the zinc separation steps 102, 204, 213, 215, 303, and 312 in the first to fifteenth embodiments.

  Next, in the zinc chlorination step 315, the zinc carbonate 21 recovered in the zinc separation step 314 is brought into contact with chlorine gas as the chlorination agent 15 to chlorinate the zinc carbonate 21 to produce purified zinc chloride 14. The other contents in the zinc chlorination process 315 are the zinc chlorination processes 103, 211, 214, 216, 310, and 313 in the first to fifth, seventh, ninth, eleventh, thirteenth and fifteenth embodiments. It is similar.

  Further, in the alkali regeneration step 316, ammonium carbonate 24 is added to the filtrate 22 mainly composed of sodium chloride after zinc carbonate is separated in the zinc separation step 314 to precipitate sodium carbonate, and solid-liquid separate it. The solid 25 is recovered as a solid and returned to the iron removal step 302 and the zinc separation step 314 as the alkali agent 7, and the filtrate 25 after solid-liquid separation is discharged. The other contents of the alkali regeneration step 217 are the same as the alkali regeneration steps 205, 217, and 304 in the sixth, seventh, tenth, and thirteenth embodiments.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the twelfth embodiment, in the purified zinc chloride production step, the zinc separation step 314 is carried out from the aqueous solution of zinc chloride through the substitution step 306. The zinc component is separated as a zinc-containing compound, and the zinc component in the zinc-containing compound is chlorinated to form purified zinc chloride, and thus the zinc metallurgical process of higher purity is achieved because the zinc chloride step 315 is performed. It can be mass-produced well well.

(Seventeenth embodiment)
Next, with reference to FIG. 17, a method of manufacturing a zinc metal in accordance with a seventeenth embodiment of the present invention will be described in detail.

  FIG. 17 is a view showing the process of the method of manufacturing a zinc ingot according to the present embodiment.

  The method for producing zinc ingot according to the present embodiment has a zinc extraction step 311 and a zinc separation step 312 at a stage prior to the hydrochloric acid leaching step 301, as compared with the method for producing zinc ingot according to the sixteenth embodiment. That is the main difference. In the present embodiment, description will be made by paying attention to the difference, and the same components will be denoted by the same reference numerals, and the description thereof will be omitted or simplified.

  Specifically, in the zinc extraction step 311, the electric furnace dust 1 as a raw material containing a zinc-containing compound such as zinc oxide and an iron compound such as iron oxide is brought into direct contact with an aqueous solution of an alkali agent 7 As a zinc extract obtained by selectively extracting the zinc component from the zinc-containing compound, an alkaline agent aqueous solution 30 containing the zinc component is generated, and solid content not dissolved in the aqueous solution of the alkaline agent 7 is defined as the residue 20. Here, the residue 20 is sent to a hydrochloric acid leaching step 301.

  On the other hand, in the zinc separation step 312, the alkali agent aqueous solution 30 containing the zinc component extracted in the zinc extraction step 311 is brought into contact with carbon dioxide 23, and the alkali containing the zinc component extracted in the zinc extraction step 311 Zinc carbonate 21 is precipitated from the aqueous agent solution 30, solid-liquid separated, recovered as a solid, and sent to the iron removal demanganese step 302. The filtrate after solid-liquid separation in the zinc separation step 312 can be repeatedly used as the alkaline agent 7 for selectively extracting the zinc component in the zinc extraction step 311. The other contents in the zinc separation step 312 are the same as the zinc separation steps 102 and 204 in the first to seventh embodiments.

  Next, in the hydrochloric acid leaching step 301, the residue 20 produced in the zinc extraction step 212 is brought into direct contact with the aqueous solution of hydrochloric acid 19 to chlorinate the electric furnace dust 1, and chloride mainly composed of a zinc chloride component and an iron chloride component A solid that does not dissolve in the aqueous solution of hydrochloric acid 19 while forming the zinc aqueous solution 6 is referred to as a residue 20.

  According to the above method of producing zinc ingot of the present embodiment, in addition to the configuration of the sixteenth embodiment, the zinc component is selectively extracted from the raw material in the former stage of the selective chlorination step 301 to obtain the zinc-containing aqueous solution Since the zinc extraction step 311 is performed to produce H.sup.2, it is possible to stably mass-produce zinc metal of higher purity with high yield.

  In summary, according to the method of producing zinc metal in each of the above embodiments, a zinc-containing aqueous solution containing a zinc component is used as a raw material for secondary dust generated when EAF dust or EAF dust is reduced by a reduction furnace. Zinc-containing aqueous solution production steps 101, 201, 202, 212, 301, 311 to be formed, and zinc component in zinc-containing aqueous solution as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide; The purified zinc chloride producing step 102, 103, 106, 107, 110, 203, 204, 206, 207, 211, 213 produces purified zinc chloride-containing purified zinc chloride by chlorinating the zinc component of the compound. Anhydrolyzed by dehydrating purified zinc chloride from 216, 302, 303, 305, 306, 310, 312 to 315 Zinc metal can be used as an electrolytic product by electrolyzing anhydrous melt-refined zinc chloride producing steps 104, 208, and 307 to produce anhydrous melt-refined zinc chloride containing melt-refined zinc chloride Since the process includes the steps of producing zinc metal products 105, 209 and 308, it is possible to stably mass-produce zinc metal having a purity of 99.995% equivalent to special high grade with high yield. is there.

  Lastly, with respect to this embodiment described above, an experiment example corresponding to the first to third, fifth, sixth and sixteenth embodiments will be described in detail with reference also to FIGS. 18 to 24. Explain to.

  FIG. 18 is Table 1 correspondingly showing the results of Experimental Example 1 of the first embodiment of the present invention, and FIGS. 19 and 20 are two Experimental Examples 2 of the second embodiment of the present invention and 21 are Tables 2 and 3 showing the results of Example 3, FIG. 21 is Table 4 showing the results of Experimental Example 4 of the third embodiment of the present invention, and FIG. 22 shows the results of the fifth embodiment of the present invention. Fig. 23 is Table 5 showing the results of the experimental example, Fig. 23 is Table 6 showing the results of the experimental example of the sixth embodiment of the present invention, and Fig. 24 is a diagram showing the sixteenth embodiment of the present invention It is Table 7 which shows the result of an experiment example. In addition, ND in a table | surface shows not detecting. Moreover, the blank in the table indicates that the electric furnace dust and the residue are less than the detection limit or not detected, and indicate that the item other than the electric furnace dust and the residue is out of the analysis item.

(Experimental example 1)
The present experimental example is an experimental example corresponding to the first embodiment of the present invention, and the results are shown in Table 1 of FIG.

First, in the zinc extraction step 101, a weight of 88.5 g is obtained from 870 g of the furnace dust (EAFD) obtained by firing only mixing of 441 g of calcium carbonate and 762.8 g of the furnace dust 1 in advance. The EAFD is separated, the separated EAFD is brought into contact with an aqueous NH ₄ Cl solution having a concentration of 20.4% as the neutral ammonium salt 29, and the solid which is not dissolved in the aqueous solution of the neutral ammonium salt 29 is filtered A zinc extract 30 of a volume of 413 ml was obtained as the remaining liquid separated by Further, the solid which is not dissolved in the aqueous solution of neutral ammonium salt 29 is filtered and washed with pure water, and then dried to obtain a residue 20 having a weight of 52.8 g. Under the extraction conditions in the zinc extraction step 101, the temperature was 95 ° C. and the pressure was normal pressure, and the contact time between the aqueous solution of the neutral ammonium salt 29 and the EAFD was 8 hours.

  Next, in the zinc separation step 102, carbon dioxide 23 was blown into the zinc extract 30 to precipitate zinc carbonate 21, and zinc carbonate 21 was separated by suction using C filter paper and filtration. The filtrate after separation of zinc carbonate 21 was repeatedly recycled as an aqueous solution of neutral ammonium salt 29 in zinc extraction step 101. The carbon dioxide 23 used what was generate | occur | produced by the decomposition | disassembly of a calcium carbonate in calcination of the electric furnace dust 1 of the zinc extraction process 101. FIG.

  Next, in the zinc chlorination step 103, the zinc carbonate 21 separated as the solid component in the zinc separation step 102 is washed with water on C filter paper and then brought into contact with chlorine gas 15 to convert it into purified zinc chloride 14. As the chlorine gas 15, one obtained in the electrolysis step 105 was used. Further, with regard to the chlorine gas 15, an exhaust gas mainly composed of the chlorine gas 15 after the water contained in the purified zinc chloride 14 was absorbed in the dehydration step 104 was also effectively used. In the chlorination conditions in the zinc chlorination step 103, the temperature is 800 ° C. and the pressure is normal pressure, and zinc chloride gas generated by reacting solid zinc carbonate 21 and chlorine gas 15 is cooled and solidified under such conditions. Purified zinc chloride 14 was obtained.

  Next, in the dehydration step 104, the purified zinc chloride 14 is heated and melted, and then the molten purified zinc chloride 14 is brought into contact with the chlorine gas 15 obtained in the electrolysis step 105 to dehydrate it, and the zinc metal 16 is To obtain a molten salt electrolytic bath consisting of anhydrous molten purified zinc chloride 14 '.

  Finally, in the electrolysis step 105, the molten salt electrolytic bath consisting of anhydrous molten purified zinc chloride 14 'is electrolyzed at a bath temperature of 500 ° C. in an electrolytic cell containing a carbon electrode, and the molten zinc metal 16 is Obtained. The purity of the zinc metal 16 was 99.995%, and it was not lower than 99.995% when confirmed by a plurality of experiments under the same conditions.

(Experimental example 2)
The present experimental example is an experimental example corresponding to the second embodiment of the present invention, and the results are shown in Table 2 of FIG.

First of all, in the zinc extraction step 101, a weight of 186 g of electric furnace dust (EAFD) obtained in advance by mixing only 441 g of calcium carbonate and 762.8 g of electric furnace dust 1 is obtained by baking. Was separated, and the separated EAFD was dissolved in a volume of 500 ml by dissolving 80.2 g of NH ₄ Cl and 66 g of (NH ₄ ) ₂ SO ₄ as neutral ammonium salt 29. An aqueous solution was brought into contact, and a solid which was not dissolved in the aqueous solution of neutral ammonium salt 29 was separated by filtration to obtain a zinc extract 30 of 362.5 ml in volume. Further, the solid which is not dissolved in the aqueous solution of neutral ammonium salt 29 is filtered and washed with pure water, and then dried to obtain 62.9 g of residue 20. Thus, by mixing (NH ₄ ) ₂ SO ₄ with the neutral ammonium salt 29, when using an aqueous NH ₄ Cl solution in Experimental Example 1, the zinc extract 30 is extracted at a concentration of 11.6 mg / l. Lead and calcium extracted at a concentration of 8910 mg / l corresponded to a lower detection limit concentration of less than 5 mg / l and a concentration of 619 mg / l. The extraction conditions such as the temperature in the zinc extraction step 101 of this experimental example were the same as those of Experimental Example 1.

  Next, in the substitution step 106, 5 g of powdered zinc particles 9 with an average particle diameter of about 6 μm are added to the zinc extract 30, and then heated and stirred, and this stirred product is filtered using a membrane filter with a filtration accuracy of 0.1 μm. The solution was suctioned and filtered to obtain a zinc extract 30 'as a filtrate. In addition, after washing the solid content on the membrane filter with demineralized water, the solid content sucked and dried and dried is reduced with the dissolution of the zinc particles 9, and the metal powder 10 precipitated and the powdery zinc which remains undissolved And a mixture of

  Next, a zinc separation step 102, a zinc chlorination step 103, a dehydration step 104 and an electrolysis step 105 following the substitution step 106 were carried out using the zinc extract 30 'in the same manner as in Example 1. The purity of the zinc metal 16 obtained in this experimental example was 99.9989%, and when it was confirmed by a plurality of experiments under the same conditions, it did not fall below 99.995%.

(Experimental example 3)
The present experimental example is an experimental example corresponding to the second embodiment of the present invention, and the results are shown in Table 3 of FIG.

First, in the zinc extraction step 101, a weight of 300 g from an electric furnace dust (EAFD) of a weight of 870 g obtained in advance by mixing only 441 g of calcium carbonate and a weight of 762.8 g of the electric furnace dust 1 The EAFD is separated, the separated EAFD is brought into contact with an aqueous NH ₄ Cl solution having a concentration of 20.4% as the neutral ammonium salt 29, and the solid which is not dissolved in the aqueous solution of the neutral ammonium salt 29 is filtered As a residual liquid separated by the above, a volume of 6015 ml of zinc extract 30 was obtained. Also, after extracting the solid content by bringing the extractable component of the solid not soluble in the aqueous solution of the neutral ammonium salt 29 into contact with the aqueous solution of 20.4% NH ₄ Cl at a concentration of 2400 ml, the solid is extracted After washing with water, filtration gave a residue 20 with a dry weight of 94.7 g. The extraction conditions such as the temperature in the zinc extraction step 101 of this experimental example were the same as those of Experimental Example 1. In addition, the filtrate after filtering off the residue 20 (an aqueous solution of a neutral ammonium salt after extracting an extractable component from the undissolved solid) is then used as a neutral ammonium salt aqueous solution 29 for dissolving EAFD. The washing water used after washing the residue 20 with pure water was used as makeup water.

  Next, the replacement step 106 following the zinc extraction step 101 is performed with the same contents as those of Experimental Example 2, and the zinc separation step 102, the zinc chlorination step 103, the dehydration step 104 and the electrolysis step 105 are Experimental Example 1 And it implemented by the same content as the thing of Experimental example 2. The purity of the zinc metal 16 obtained in the present experimental example was 99.995%, and when it was confirmed by a plurality of experiments under the same conditions, it did not fall below 99.995%.

(Experimental example 4)
The present experimental example is an experimental example corresponding to the third embodiment of the present invention, and the results are shown in Table 4 of FIG.

  First, in the zinc extraction step 101, 60.5 g of electric furnace dust (EAFD) having a weight of 870 g obtained by firing only mixed calcium carbonate having a weight of 441 g and electric furnace dust 1 having a weight of 762.8 g in advance. The EAFD is separated by weight, and the separated EAFD is brought into contact with a sodium hydroxide aqueous solution having a concentration of 16.5% as the alkali agent 7, and the solid content not dissolved in the aqueous solution of the alkali agent 7 is separated by filtration As the remaining liquid, 395 ml of zinc extract 30 was obtained. An extractable component of the solid which is not dissolved in the aqueous solution of the alkaline agent 7 is brought into contact with an aqueous solution of sodium hydroxide having a concentration of 16.55% at a volume of 866 ml to extract the solid, which is then treated with pure water. After washing, it was filtered to obtain a residue 20 with a dry weight of 43.3 g. The extraction conditions such as the temperature in the zinc extraction step 101 of this experimental example were the same as those of Experimental Example 1. In addition, the filtrate after filtering off the residue 20 (an aqueous solution of an alkaline agent after extracting an extractable component from the undissolved solid) is used as an alkaline agent 7 for dissolving EAFD next time, and the residue 20 The washing water after washing with pure water was used as dilution water.

Then, the zinc extraction step 101 in the subsequent deferrisation de manganese step 107, the red liquid was added KMnO ₄ crystals of the weight of 0.1g as an oxidizing agent 11 Zinc extract 30, of the weight of 10g under heating Activated carbon was added and it was confirmed that the liquid color became transparent, and then a filtrate (a ferric-extracted and a manganese-extracted zinc extract 30 ′ ′) was obtained by suctioning and filtering with a membrane filter with a filtration accuracy of 0.1 μm. . The solid content on the filter paper was washed with demineralized water and then dried to obtain 263 g of deironed demanganese sludge 8. The remaining deionized water was mixed with the filtrate.

  Next, the substitution step 106 following the iron removal step 107 is carried out using the zinc extract 30 ′ ′ with the same contents as in Experimental Examples 2 and 3, and the zinc separation step 102, zinc chloride Step 103, dehydration step 104 and electrolysis step 105 were carried out with the same contents as in Experimental Examples 1 to 3. The purity of the zinc metal 16 obtained in this experimental example was 99.999%, and when it was confirmed by a plurality of experiments under the same conditions, it did not fall below 99.995%. In addition, in this experiment example, the analytical value of zinc carbonate analyzes what was converted to the zinc oxide at the time of heat drying.

(Experimental example 5)
The present experimental example is an experimental example corresponding to the fifth embodiment of the present invention, and the results are shown in Table 5 of FIG.

First, in the zinc extraction step 101, 228.3 g of electric furnace dust (EAFD) having a weight of 870 g obtained by firing only mixed calcium carbonate having a weight of 441 g and electric furnace dust 1 having a weight of 762.8 g in advance. Solid fraction which is not dissolved in the aqueous solution of neutral ammonium salt 29 by contacting the separated EAFD with an aqueous solution of NH ₄ Cl having a concentration of 20.4% as the neutral ammonium salt 29. Was separated by filtration to obtain a zinc extract 30 with a volume of 1280 ml. The solid content not dissolved in the aqueous solution of neutral ammonium salt 29 was filtered and washed with pure water, and then dried to obtain a residue 20 weighing 154.5 g. The extraction conditions such as the temperature in the zinc extraction step 101 of this experimental example were the same as those of Experimental Example 1.

  Next, the zinc separation step 102 was performed with the same contents as those of Experimental Examples 1 to 4.

  Next, in the zinc chlorination step 103, zinc carbonate 21 separated as a solid in the zinc separation step 102 was dissolved in dilute hydrochloric acid to obtain an aqueous solution of purified zinc chloride 14.

  Next, in the iron removal and manganese removal step 111 following the zinc chloride step 103, an aqueous sodium hypochlorite solution is added as an oxidant 11 to the aqueous solution of purified zinc chloride 14, and a membrane filter with a filtration accuracy of 0.1 μm is drawn and filtered. The resulting filtrate (an aqueous solution of purified iron chloride 14 ′ ′ deferred and demanganized) was obtained. The solid content on the filter paper was washed with demineralized water and then dried to obtain deironed demanganese sludge 8. In the iron removal and manganese removal step 111, chromium was also removed in addition to iron and manganese. The remaining deionized water was mixed with the filtrate.

  Next, in the substitution step 109, 5 g of powdered zinc particles 9 having an average particle diameter of about 6 μm are introduced into an aqueous solution of purified zinc chloride 14 ′ ′, and heating and stirring are carried out. The solution was suctioned through a 1 μm membrane filter and filtered to obtain an aqueous solution of purified zinc chloride 14 ′ ′ ′ as a filtrate. The solid content on the membrane filter is washed with desalted water and then suction-dehydrated and dried, and the solid content is reduced with the dissolution of the zinc particles 9 and precipitated, and the metal powder 10 precipitated and the powdery zinc left undissolved. It was a mixture.

  Next, in the concentration step 110, an aqueous solution of purified zinc chloride 14 ′ ′ ′ is concentrated by evaporating water under reduced pressure using a quartz separable flask, and then heated to a temperature of 400 ° C. under normal pressure to dryness. Thus, white purified zinc chloride 14 "" and evaporation water 13 were obtained.

  Next, in the dehydration step 104, the purified zinc chloride 14 ′ ′ ′ ′ is heated and melted, and then the molten purified zinc chloride 14 is brought into contact with the chlorine gas 15 obtained in the electrolysis step 105 and dehydrated. A molten salt electrolytic bath comprising anhydrous molten refined zinc chloride 14 'for producing zinc metal 16 was obtained.

  Finally, in the electrolysis step 105, the molten salt electrolytic bath consisting of anhydrous molten purified zinc chloride 14 'is electrolyzed at a bath temperature of 500 ° C. in an electrolytic cell containing a carbon electrode to obtain a zinc metal in a molten state. The The purity of the zinc metal 16 was 99.9989%, and it was not lower than 99.995% when confirmed by a plurality of experiments under the same conditions.

(Experimental example 6)
The present experimental example is an experimental example corresponding to the sixth embodiment of the present invention, and the results are shown in Table 6 of FIG.

  First, in the selective chlorination step 201, the electric furnace dust 1 is brought into contact with a mixed gas of chlorine gas 15 and oxygen gas 17 under the conditions of a reaction temperature of 900 ° C. in a vertical tubular furnace (reaction tube) Crude zinc chloride 3 and oxygen 2 mainly composed of zinc chloride components were evaporated from the electric furnace dust 1 of In the lower part of the tubular furnace, a residue 4 mainly composed of non-volatile iron oxide remained.

Next, in the dissolution step 202, the crude zinc chloride 3 was dissolved in demineralized water 13, suctioned and filtered to obtain a zinc chloride aqueous solution 6. Here, 0.73 g of lead was recovered from an aqueous solution obtained by washing the insoluble sludge 5 containing PbCl ₂ and Fe ₂ O ₃ as main components and filtered off by suction and filtration. On the other hand, the dry weight in the solid content which has Fe ₂ O ₃ which is not dissolved by water washing as a main component was 0.1 g. Then, the zinc chloride aqueous solution 6 was separated to obtain zinc carbonate for use as an alkali agent.

  Next, in the iron removal iron removal step 203, the zinc chloride aqueous solution 6 other than that used in the zinc separation step 207 is diluted with demineralized water to make its volume 2680 ml, to which chlorine gas as the oxidant 11 is blown. The pH is adjusted to 4.16 by adding zinc hydroxide obtained in the zinc separation step 207 as pH adjuster 7, this is suctioned and filtered with a C filter paper, and a filtrate (iron-free ferric chloride-free zinc chloride aqueous solution 6 ') is obtained Obtained. The initial pH of this aqueous zinc chloride solution 6 'was 1.8. The amount of chlorine gas blown was controlled so that the measured value of the redox potential (ORP) when zinc hydroxide was added as the alkaline agent 7 was in the range of 1130 mV to 1150 mV. In addition, the solid content on the filter paper was washed with demineralized water and dried to obtain a deironed demanganese sludge 8 having a weight of 263 g. In the iron removal and manganese removal step 203, chromium was also removed in addition to iron and manganese. The washing water was mixed with the filtrate.

  Next, in the substitution step 206, 25 g of powdered zinc particles 9 having an average particle diameter of about 6 μm are added to a filtrate containing washing water (zinc-free aqueous solution of zinc chloride 6 ′ deferrated with manganese), and then heated and stirred. Then, this stirred product was suctioned and filtered through a membrane filter with a filtration accuracy of 0.1 μm to obtain a filtrate (an aqueous solution of zinc chloride 6 ′ ′). Also, after washing the solid content on the membrane filter with demineralized water, the solid content that has been sucked and dewatered and dried is reduced along with the dissolution of the zinc particles 9 and the metal powder 10 precipitated and the powder that remains undissolved It was a mixture of zinc oxide and

  Here, in the zinc separation step 204, sodium carbonate was added as an alkaline agent 7 to an aqueous solution of zinc chloride 6 'to precipitate zinc carbonate 21, which was separated by suction using C filter paper and filtration. Since this zinc carbonate 21 is heated and dried and simultaneously decomposes into zinc hydroxide and carbon dioxide, the obtained zinc hydroxide was used in place of the alkali agent in the deironing and manganese removal step.

  In addition, in the alkali regeneration step 205, ammonium carbonate 24 is added to the filtrate 22 mainly composed of sodium chloride from which zinc carbonate 21 is separated to precipitate sodium carbonate, which is filtered to recover sodium carbonate. The recovered sodium carbonate was used as the alkaline agent 7 in the zinc separation step 207. Moreover, the filtrate 25 which filtered sodium carbonate in this way was discharged | emitted.

  Next, in the concentration step 207, the aqueous solution of zinc chloride 6 ′ ′ is concentrated by evaporating water under reduced pressure using a quartz separable flask, and then dried by heating to 400 ° C. under normal pressure to a white color. Purified zinc chloride 14 and evaporated water 13 were obtained.

  Next, in the dehydration step 208, the purified zinc chloride 14 is heated and melted, and then it is brought into contact with the chlorine gas 15 obtained in the electrolysis step and dehydrated to produce anhydrous zinc metal chloride 14 for producing the zinc metal 16. The resulting molten salt electrolytic bath.

  Next, in the electrolysis step 209, the molten salt electrolytic bath consisting of anhydrous molten purified zinc chloride 14 is electrolyzed under the condition of a bath temperature of 500 ° C. in an electrolytic cell containing a carbon electrode, and zinc metal in a molten state I got sixteen. The purity of the zinc metal 16 obtained in this experimental example was 99.9992%, and when it was confirmed by a plurality of experiments under the same conditions, it did not fall below 99.995%.

(Experimental example 7)
This experimental example is an experimental example corresponding to the sixteenth embodiment of the present invention, and the results are shown in Table 7 of FIG.

  First, in the hydrochloric acid leaching step 301, 500 g of electric furnace dust 1 is dissolved as a chlorinating agent 15 in a hydrochloric acid aqueous solution having a volume of 1000 ml and a concentration of 35%, solid content not dissolved in hydrochloric acid is separated by filtration, I got The solid content not dissolved in hydrochloric acid was washed with pure water and then filtered to obtain a residue 20 having a dry weight of 50.5 g. The dissolution and extraction conditions at this time were a temperature of 95 ° C., a pressure of normal pressure, and a contact time of hydrochloric acid and electric furnace dust 1 of 8 hours.

  Next, in the iron removal and manganese removal step 302, the aqueous zinc chloride solution 6 is diluted with demineralized water to make its volume 2500 ml, while sodium hydroxide as the pH adjuster 7 and sodium hypochlorite as the oxidant 11 To a pH of 4.05, followed by suction and filtration with a C filter paper to obtain a filtrate (iron-free aqueous solution of manganese chloride 6 'free of iron and manganese). The initial pH of this aqueous zinc chloride solution 6 'was 0.53. The amount of injected chlorine gas was controlled so that the measured value of the redox potential (ORP) at the time of addition of the alkaline agent 7 and the oxidizing agent 11 was in the range of 1130 mV to 1150 mV. Also, the solid content on the filter paper was washed with demineralized water and dried to obtain 263 g of deironed demanganese 8. In the iron removal and manganese removal step 302, chromium was also removed in addition to iron and manganese. The washing water was mixed with the filtrate.

  Next, in the substitution step 305, 25 g of powdered zinc particles 9 having an average particle diameter of about 6 μm are added to a filtrate containing wash water (an iron removal aqueous solution of zinc chloride 6 ′ deferrated with manganese), and then heated and stirred. Then, this stirred product was suctioned and filtered through a membrane filter with a filtration accuracy of 0.1 μm to obtain a filtrate (an aqueous solution of zinc chloride 6 ′ ′ after filtration). Further, after washing the solid content on the membrane filter with demineralized water, the solid content of 36.6 g which is sucked and dried and dried is reduced and precipitated as the zinc particles 9 dissolve, and the metal powder 10, At this time, it was a mixture of powdery zinc which did not dissolve and remained.

  Next, in the zinc separation step 314, sodium carbonate is added as an alkaline agent 7 to the aqueous solution of zinc chloride 6 '' after filtration to precipitate zinc carbonate 21, which is separated by suction using C filter paper and filtration. did. The zinc carbonate 21 is heated and dried to form zinc carbonate 21 for salification in the zinc chlorination step 315.

  Here, in the alkali regeneration step 316, ammonium carbonate 24 is added to the filtrate 22 mainly composed of sodium chloride from which zinc carbonate has been separated, sodium carbonate is precipitated and filtered to recover sodium carbonate. This was used as an alkaline agent 7 in the zinc separation step 314. In addition, the filtrate 25 after depositing sodium carbonate and filtering it was discharged | emitted.

  Next, in the zinc chlorination step 315, after the zinc carbonate 21 obtained as the solid content in the zinc separation step 314 is washed with water on a C filter paper, solid zinc carbonate 21 under the conditions of a temperature of 800 ° C. and a pressure of normal pressure. The reaction is brought into contact with chlorine gas 15 and reacted, and the generated zinc chloride gas is cooled and solidified to obtain purified zinc chloride 14. Under the present circumstances, the chlorine gas 15 used what was obtained at the electrolysis process 308, and used effectively the waste gas which makes chlorine gas which absorbed the water contained in refined zinc chloride 14 at the dehydration process 307 together as a main component.

  Next, in the dehydration step 307, the purified zinc chloride 14 is heated and melted, and then it is brought into contact with the chlorine gas 15 obtained in the electrolysis step 308 to be dehydrated, thereby producing anhydrous zinc melt for producing the zinc metal 16. It was set as the molten salt electrolytic bath which consists of zinc chloride 14 '.

  Next, in the electrolysis step 308, the molten salt electrolytic bath consisting of anhydrous molten purified zinc chloride 14 'is electrolyzed under the condition of a bath temperature of 500 ° C. in an electrolytic cell containing a carbon electrode, and the molten zinc I got 16 gold. The purity of the zinc metal 16 obtained in the present experimental example was 99.997%, and when it was confirmed by a plurality of experiments under the same conditions, it did not fall below 99.995%.

  Although detailed description is omitted, according to the experimental example corresponding to the remaining embodiment of the present invention, in the configuration without the zinc chlorination step, the example of the purity of the zinc metal 16 is less than 99.995% Although the occurrence frequency was reduced, the yield at which the purity of the zinc metal 16 is 99.995% or more was remarkably improved from those in Patent Documents 1 and 2.

  Further, the present invention is not limited to the embodiments described above in terms of the shape, arrangement, number, etc. of constituent elements, and such constituent elements may be appropriately replaced with ones having equivalent functions and effects, etc. Of course, they can be changed as appropriate within the scope of the problem.

  As described above, according to the present invention, it is possible to provide a method of manufacturing zinc metal that can stably mass-produce zinc metal having a purity of 99.995% equivalent to special high grade with high yield. Because of its universality and universal character, the reduction furnace is used to recycle a portion of EAF dust or EAF dust generated during melting and smelting of scrap in the EAF method, which is one of the ironmaking processes, widely due to its universal characteristics. It is expected that it can be applied to the manufacturing method of the zinc metal which uses as a raw material the secondary dust generated in.

DESCRIPTION OF SYMBOLS 1 ... Electric furnace dust or secondary dust 2 ... Oxygen gas 3 ... Crude zinc chloride 4 ... Residue 5, 8 ... Sludge 6, 6 ', 6''... Zinc chloride aqueous solution 7 ... Alkali agent 9 ... Zinc particle 10 ... Metal impurity component 11 ... oxidizing agent 13 ... evaporation water 14, 14 ', 14'',14''', 14 '''' ... refined zinc chloride 14 '... anhydrous molten refined zinc chloride 15 ... chloride agent 16 ... zinc metal 17 ... Air 18 ... Hypochlorite 19 ... Hydrochloric acid 20 ... Residue 21 ... Zinc carbonate 22, 25 ... Filtrate 23 ... Carbon dioxide 24 ... Ammonium carbonate 29 ... Neutral ammonium salt 30, 30 ', 30''... Alkaline agent aqueous solution 101, 212, 311 ... zinc extraction process 102, 204, 213, 215, 303, 312, 314 ... zinc separation process 103, 211, 214, 216, 310, 313, 315 ... zinc chloride process 104, 208, 307 Dehydration process 105, 209, 308: Electrolysis process 106, 109, 206, 305: Replacement process 107, 111, 203, 302: Deferrous demanganese process 108, 210, 309: Chlorine absorption process 201: Selective chlorination process 202: Dissolution Process 205, 217, 304, 316 ... alkali regeneration process 110, 207, 306 ... concentration process 301 ... hydrochloric acid leaching process

In order to achieve the above object, according to the first aspect of the present invention, the method of producing zinc ingot comprises: electric furnace dust or secondary dust generated when the electric furnace dust is reduced by a reduction furnace; Forming a zinc-containing aqueous solution containing a zinc component according to the above, and generating a zinc-containing compound in at least one form of a carbonate, a hydroxide and an oxide from the zinc component in the zinc-containing aqueous solution A step of producing purified zinc chloride which produces purified zinc chloride containing purified zinc chloride while using the produced zinc-containing compound, and anabolished melt by anodizing the purified zinc chloride A process for producing anhydrous molten refined zinc chloride to produce anhydrous molten refined zinc chloride containing purified zinc chloride, and electrolysis of said anhydrous molten refined zinc chloride to form zinc metal; Comprising zinc bullion generating step of generating as the solution product, the.

Moreover, the manufacturing method of the zinc metal in the 5th aspect of this invention contains the zinc component in the said raw material by using as a raw material the secondary dust which generate | occur | produces when an electric furnace dust or the said electric furnace dust is reduce | restored by a reduction furnace. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten purified zinc chloride to be formed, and a zinc metal producing apparatus for producing zinc ingot as an electrolytic product by electrolyzing the anhydrous molten purified zinc chloride And the zinc-containing aqueous solution producing step has a zinc extracting step of selectively extracting the zinc component from the raw material to produce the zinc-containing aqueous solution, The purified zinc chloride production step is a zinc separation step of separating the zinc component as the zinc-containing compound from the zinc-containing aqueous solution, and the zinc chloride for producing the purified zinc chloride by salinating the zinc component in the zinc-containing compound And a step of dehydrating the purified zinc chloride in the molten state to form the anhydrous molten purified zinc chloride, and the step of producing the zinc metal includes the steps of the has an electrolysis of the electrolysis step anhydrous molten purified zinc chloride as an electrolytic bath, in the zinc chloride process, water in the purified zinc chloride by contacting an aqueous solution of hydrochloric acid in the zinc-containing compound Forming a solution of purified zinc chloride aqueous solution and bringing metal zinc into contact with the purified zinc chloride aqueous solution to reduce and deposit a metal impurity component nobler than zinc in the purified zinc chloride aqueous solution; a concentration step of concentrating by evaporation the purified zinc chloride solution through the steps, that further have a.

In addition to the fifth aspect, the present invention separates the iron component and the manganese component in the purified zinc chloride aqueous solution by bringing the oxidizing agent into contact with the purified zinc chloride aqueous solution generated in the zinc chloride step. with further having a leaving iron removal manganese step of, in the substitution step, contacting said metallic zinc to the purification chloride nitrite Namarisui solution having passed through the de-iron removing manganese step and the sixth aspect.

In the method of producing zinc ingot according to the seventh aspect of the present invention , the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace is used as a raw material and contains the zinc component in the raw material. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten purified zinc chloride to be formed, and a zinc metal producing apparatus for producing zinc ingot as an electrolytic product by electrolyzing the anhydrous molten purified zinc chloride When a process for the preparation of zinc ingots comprising the zinc-containing solution generating step, selection chloride process the raw material evaporated by contacting the chlorine gas to produce a selectively chloride zinc chloride said zinc component And dissolving the zinc chloride in water to form an aqueous solution of zinc chloride, wherein the step of producing purified zinc chloride includes bringing the aqueous solution of zinc chloride into contact with an alkali agent and an oxidizing agent to form the zinc chloride solution. Deironization and demanganese separation step for separating iron component and manganese component in aqueous zinc solution, and substitution step for reduction precipitation of metal impurity component more noble than zinc in zinc chloride aqueous solution from which iron component and manganese component are separated And a concentration step of evaporating and concentrating the aqueous solution of zinc chloride in which the metal impurity component is reduced and precipitated, to produce the purified zinc chloride, the iron component and the manganese component Separating the zinc component as the zinc-containing compound from the separated aqueous solution of zinc chloride and returning it to the deferrous-demanganese-removing step; has a dehydration step of zinc was dehydrated in a molten state to produce said anhydrous melt refining zinc chloride, the zinc ingots generation step, that having a electrolysis of the electrolysis step of the anhydrous molten purified zinc chloride as an electrolytic bath .

In the method of producing zinc ingot according to the eighth aspect of the present invention , the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace is used as a raw material and contains the zinc component in the raw material. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten purified zinc chloride to be formed, and a zinc metal producing apparatus for producing zinc ingot as an electrolytic product by electrolyzing the anhydrous molten purified zinc chloride When a process for the preparation of zinc ingots comprising the zinc-containing solution generating step includes a zinc extraction step of generating said zinc-containing solution to selectively extract the zinc component from said raw material, said zinc extraction A selective chlorination step of selectively corroding the zinc component by contact with chlorine gas and evaporating the residue in the step to form zinc chloride, and a dissolution step of dissolving the zinc chloride in water to form an aqueous zinc chloride solution; And the purified zinc chloride producing step comprises contacting the aqueous solution of zinc chloride with an alkaline agent and an oxidizing agent to separate an iron component and a manganese component in the aqueous solution of zinc chloride; And a substitution step of reducing and precipitating a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component and the manganese component are separated; The zinc chloride aqueous solution is evaporated and concentrated to form the purified zinc chloride, and the zinc separation step of separating the zinc component from the zinc-containing aqueous solution as the zinc-containing compound and returning it to the iron removal manganese removal step And the above-mentioned anhydrous melt-refined zinc chloride producing step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride, and the zinc metal producing step that having a electrolysis of the electrolysis step of the anhydrous molten purified zinc chloride as an electrolytic bath.

In the method of producing zinc ingot according to the ninth aspect of the present invention , the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace is used as a raw material and contains the zinc component in the raw material. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten purified zinc chloride to be formed, and a zinc metal producing apparatus for producing zinc ingot as an electrolytic product by electrolyzing the anhydrous molten purified zinc chloride When a process for the preparation of zinc ingots comprising the zinc-containing solution generating step, selection chloride process the raw material evaporated by contacting the chlorine gas to produce a selectively chloride zinc chloride said zinc component And dissolving the zinc chloride in water to form an aqueous solution of zinc chloride, wherein the step of producing purified zinc chloride includes bringing the aqueous solution of zinc chloride into contact with an alkali agent and an oxidizing agent to form the zinc chloride solution. Deironization and demanganese separation step for separating iron component and manganese component in aqueous zinc solution, and substitution step for reduction precipitation of metal impurity component more noble than zinc in zinc chloride aqueous solution from which iron component and manganese component are separated A zinc separation step of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step, and the zinc component in the zinc-containing compound A process for producing zinc chloride which is purified by chlorination to produce purified zinc chloride; and the process for producing anhydrous dry purified zinc chloride is a process for dehydrating the purified zinc chloride in a molten state to produce anhydrous dry purified zinc chloride has the zinc ingots generation step, that having a electrolysis of the electrolysis step of the anhydrous molten purified zinc chloride as an electrolytic bath.

In the method of producing zinc ingot according to the tenth aspect of the present invention , the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace is used as a raw material and contains the zinc component in the raw material. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten refined zinc chloride to be formed, and a process for producing zinc ingot which is produced as an electrolytic product by electrolyzing the anhydrous molten refined zinc chloride A manufacturing method of zinc bullion comprising a degree, wherein the zinc-containing solution generating step includes a zinc extraction step of generating said zinc-containing solution to selectively extract the zinc component from said raw material, said zinc A selective chlorination step of selectively chlorinating the zinc component by contacting chlorine gas with the residue in the extraction step to evaporate the zinc component to form zinc chloride; and a dissolution step of dissolving the zinc chloride in water to form a zinc chloride aqueous solution And said purified zinc chloride producing step comprises contacting iron with said zinc chloride aqueous solution with an alkali agent and an oxidizing agent to separate iron component and manganese component in said zinc chloride aqueous solution, and A substitution step of reducing and precipitating a metallic impurity component nobler than zinc in the aqueous solution of zinc chloride from which the iron component and the manganese component are separated; A zinc separation step of separating the zinc component from the aqueous solution as the zinc-containing compound, and a zinc chloride step of salifying the zinc component in the zinc-containing compound to form purified zinc chloride, the anhydrous melting purification The zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous molten purified zinc chloride, and the zinc metal production step uses the anhydrous molten purified zinc chloride as an electrolytic bath that having a electrical decomposing electrolytic process.

In the method of producing zinc ingot according to the eleventh aspect of the present invention , the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace is used as a raw material and contains the zinc component in the raw material. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten refined zinc chloride to be formed, and a process for producing zinc ingot which is produced as an electrolytic product by electrolyzing the anhydrous molten refined zinc chloride A manufacturing method of zinc ingots having a degree, wherein the zinc-containing solution generating step, have a hydrochloric acid leaching step to produce an aqueous zinc chloride solution salified said zinc component is contacted with an aqueous solution of hydrochloric acid to the raw material And removing the iron component and the manganese component in the aqueous zinc chloride solution by contacting the aqueous solution of zinc chloride with the alkaline agent and the oxidizing agent; A substitution step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the manganese component has been separated, and evaporating and concentrating the zinc chloride aqueous solution in which the metal impurity component is reduced and precipitated A concentration step of producing zinc chloride, the zinc component from the zinc chloride aqueous solution from which the iron component and the manganese component are separated; Separating and returning to the deferrous demanganese-removing step, and the anhydrous melt-refined zinc chloride producing step dehydrates the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride has a dehydration step of the zinc ingots generation step, that having a electrolysis of the electrolysis step of the anhydrous molten purified zinc chloride as an electrolytic bath.

In the method of producing zinc ingot according to the twelfth aspect of the present invention , the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace is used as a raw material and contains the zinc component in the raw material. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten refined zinc chloride to be formed, and a process for producing zinc ingot which is produced as an electrolytic product by electrolyzing the anhydrous molten refined zinc chloride A manufacturing method of zinc bullion comprising a degree, wherein the zinc-containing solution generating step includes a zinc extraction step of generating said zinc-containing solution to selectively extract the zinc component from said raw material, said zinc And a hydrochloric acid leaching step of contacting an aqueous solution of hydrochloric acid with the residue in the extraction step to form an aqueous zinc chloride solution obtained by chlorinating the zinc component, and the purified zinc chloride production step comprises: Removing iron from the aqueous solution of zinc chloride and separating the iron and manganese components in the aqueous solution of zinc chloride, and a metal nobler than zinc in the aqueous solution of zinc chloride from which the iron and manganese components are separated. A substitution step of reducing and precipitating an impurity component, and evaporating and concentrating the aqueous solution of zinc chloride on which the metal impurity component is reductively deposited to form the purified zinc chloride And a zinc separation step of separating the zinc component as the zinc-containing compound from the zinc-containing aqueous solution and returning it to the deferrous-demanganese-removing step, wherein the anhydrous melt-refined zinc chloride production step comprises the purification The method includes a dehydration step of dehydrating zinc chloride in a molten state to form the anhydrous molten purified zinc chloride, and the zinc metal production step includes an electrolysis step of electrolysis using the anhydrous molten purified zinc chloride as an electrolytic bath. Ru.

In the method of producing zinc ingot according to the thirteenth aspect of the present invention , the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace is used as a raw material and contains the zinc component in the raw material. A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten refined zinc chloride to be formed, and a process for producing zinc ingot which is produced as an electrolytic product by electrolyzing the anhydrous molten refined zinc chloride A manufacturing method of zinc ingots having a degree, wherein the zinc-containing solution generating step, have a hydrochloric acid leaching step to produce an aqueous zinc chloride solution salified said zinc component is contacted with an aqueous solution of hydrochloric acid to the raw material And removing the iron component and the manganese component in the aqueous zinc chloride solution by contacting the aqueous solution of zinc chloride with the alkaline agent and the oxidizing agent; Separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step of reducing and precipitating a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the manganese component has been separated, and the substitution step The method includes a zinc separation step, and a zinc chlorination step of salifying the zinc component in the zinc-containing compound to form purified zinc chloride, wherein the anhydrous melting is performed. The zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-purified zinc chloride, and the zinc metal production step electrolyses the anhydrous melt-purified zinc chloride that having a electrolyzed electrolytic process as.

Further, the method for producing zinc ingot according to the fourteenth aspect of the present invention includes the zinc component in the raw material, using the electric furnace dust or the secondary dust generated when the electric furnace dust is reduced by a reduction furnace as a raw material A step of producing a zinc-containing aqueous solution for producing a zinc-containing aqueous solution, the zinc component in the zinc-containing aqueous solution being a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A purified zinc chloride-producing step of producing purified zinc chloride containing purified zinc chloride, and anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing said purified zinc chloride A process for producing anhydrous molten refined zinc chloride to be formed, and a process for producing zinc ingot which is produced as an electrolytic product by electrolyzing the anhydrous molten refined zinc chloride A manufacturing method of zinc bullion comprising a degree, wherein the zinc-containing solution generating step includes a zinc extraction step of generating said zinc-containing solution to selectively extract the zinc component from said raw material, said zinc A hydrochloric acid leaching step of contacting an aqueous solution of hydrochloric acid with the residue in the extraction step to form an aqueous zinc chloride solution obtained by chlorinating the zinc component; and the purified zinc chloride production step comprises oxidizing the zinc chloride aqueous solution with an alkali agent and oxidizing Removing iron from the aqueous solution of zinc chloride and separating the iron and manganese components in the aqueous solution of zinc chloride, and a metal nobler than zinc in the aqueous solution of zinc chloride from which the iron and manganese components are separated. A separation step for reducing and precipitating an impurity component, and a zinc separation for separating the zinc component as the zinc-containing compound from the aqueous zinc chloride solution subjected to the substitution step And a zinc-chlorination step of salifying the zinc component in the zinc-containing compound to form purified zinc chloride, and the anhydrous melt-refined zinc chloride generation step dehydrates the purified zinc chloride in a molten state and has a dehydration step to generate the anhydrous melt purification chloride zinc, said zinc bullion generation step, that having a electrolysis of the electrolysis step of the anhydrous molten purified zinc chloride as an electrolytic bath.

According to the method of producing zinc ingot according to the first aspect of the present invention, zinc containing zinc as a raw material and secondary dust generated when electric furnace dust or electric furnace dust is reduced by a reduction furnace is used as a raw material a zinc-containing aqueous solution generating step of generating an aqueous solution, carbonate zinc component in the zinc-containing solution, to produce at least one form of the zinc-containing compound of hydroxides and oxides, while using a zinc-containing compound that generates A step of producing purified zinc chloride to produce purified zinc chloride containing purified zinc chloride, and anodizing the purified zinc chloride to produce anhydrous molten purified zinc chloride containing anhydrous molten purified zinc chloride And a process for producing zinc chloride which produces zinc ingot as an electrolytic product by electrolyzing the anhydrous melt-refined zinc chloride. Since shall be it can be mass-produced high yield stably zinc bullion with a purity equivalent 99.995% Special High Grade.

Further, according to the method of producing zinc ingot according to the fifth aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. The production method, the zinc-containing aqueous solution production step has a zinc extraction step of selectively extracting the zinc component from the raw material to produce a zinc-containing aqueous solution, and the purified zinc chloride production step comprises the zinc component from the zinc-containing aqueous solution Separation step as zinc-containing compound, and zinc chloride step of forming a purified zinc chloride by salinating a zinc component in the zinc-containing compound, and an anhydrous melt-refined zinc chloride generation step: purifying zinc chloride Is dewatered in the molten state to form anhydrous molten refined zinc chloride, and the zinc metal production process has an electrolytic process of electrolysis using anhydrous molten refined zinc chloride as an electrolytic bath, and An aqueous solution of hydrochloric acid is brought into contact with a zinc-containing compound to produce a purified zinc chloride aqueous solution which is an aqueous solution of purified zinc chloride, and metallic zinc is brought into contact with the purified zinc chloride aqueous solution to Since the method further includes a substitution step of reducing and depositing a metal impurity component nobler than zinc in an aqueous solution, and a concentration step of evaporating and concentrating the purified zinc chloride aqueous solution subjected to the substitution step, zinc of higher purity Bar metal can be stably mass-produced with high yield.

Further, according to the method for producing zinc metal in the sixth aspect of the present invention, the iron component and the manganese component in the purified zinc chloride aqueous solution are brought into contact with the purified zinc chloride aqueous solution produced in the zinc chlorination step. further and has a deferrisation de manganese step of separating the, in the substitution process, since the purification chloride nitrous Namarisui solution passed through the de-iron removal manganese process is intended to contact the zinc metal yields higher purity zinc bullion It can be mass-produced well well.

Further, according to the method for producing zinc metal in the seventh aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A manufacturing method of zinc-containing aqueous solution generating step is a selection chloride process the raw material to selectively chloride zinc component is evaporated by contacting the chlorine gas to produce a zinc chloride, zinc chloride was dissolved in water chloride And a dissolution process for producing an aqueous zinc solution, and the purified zinc chloride production process comprises contacting an aqueous solution of zinc chloride with an alkali agent and an oxidizing agent to separate iron and manganese components in the aqueous zinc chloride solution. A manganese process, a substitution process for reducing and precipitating a metallic impurity component nobler than zinc in an aqueous solution of zinc chloride from which an iron component and a manganese component are separated, and evaporation and concentration of an aqueous solution of zinc chloride on which a metallic impurity component is reduced and precipitated Decondensing iron by separating the zinc component as a zinc-containing compound from a zinc chloride aqueous solution from which an iron component and a manganese component have been separated. A zinc separation step to be brought back to a certain extent, and the anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating purified zinc chloride in the molten state to produce anhydrous melt-refined zinc chloride; Since it has an electrolysis process to electrolyze anhydrous molten refined zinc chloride as an electrolytic bath, zinc chloride as a zinc-containing compound is preferentially generated as an aqueous solution from electric furnace dust or secondary dust as a raw material, 99. based on the production concept of purifying zinc chloride to produce zinc ingot using zinc-containing compounds in the form of at least one of carbonates, hydroxides and oxides formed from zinc components in raw materials; Zinc ingot having a purity of 995% can be mass-produced stably with high yield.

Further, according to the method of producing zinc metal in the eighth aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A manufacturing method of zinc-containing aqueous solution produced step, and zinc extraction step the zinc component from the material selectively extracting and generating a zinc-containing aqueous solution, zinc evaporated residue is contacted with chlorine gas in the zinc extraction step And selectively dissolving the components to form zinc chloride, and dissolving zinc chloride in water to form an aqueous solution of zinc chloride, and the step of producing purified zinc chloride comprises An iron-free demangaing step of separating an iron component and a manganese component in an aqueous zinc chloride solution by bringing an alkaline agent and an oxidizing agent into contact with each other, and a metal nobler than zinc in an aqueous zinc chloride solution from which the iron component and the manganese component are separated. A displacement step of reducing and precipitating impurity components; a concentration step of evaporating and concentrating an aqueous solution of zinc chloride on which metal impurity components are reductively precipitated to form purified zinc chloride; zinc-containing water And separating the zinc component from the solution as a zinc-containing compound and returning it to the iron removal manganese removal step; and the anhydrous melting and refining zinc chloride forming step dehydrates the purified zinc chloride in a molten state to Since it has a dehydration step to produce zinc chloride, and the zinc metal production step has an electrolysis step to electrolyze anhydrous molten refined zinc chloride as an electrolytic bath, it stabilizes higher purity zinc metal with high yield. Mass production.

Further, according to the method of producing zinc metal in the ninth aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A manufacturing method of zinc-containing aqueous solution generating step is a selection chloride process the raw material to selectively chloride zinc component is evaporated by contacting the chlorine gas to produce a zinc chloride, zinc chloride was dissolved in water chloride And a dissolution process for producing an aqueous zinc solution, and the purified zinc chloride production process comprises contacting an aqueous solution of zinc chloride with an alkali agent and an oxidizing agent to separate iron and manganese components in the aqueous zinc chloride solution. Separates the zinc component as a zinc-containing compound from the manganese step, the substitution step of reducing and precipitating metal impurity components that are nobler than zinc in an aqueous solution of zinc chloride from which the iron component and the manganese component are separated, Separation step, and a zinc chloride step of salifying the zinc component in the zinc-containing compound to form purified zinc chloride, wherein It has a dehydration step of dehydrating purified zinc chloride in a molten state to form anhydrous molten purified zinc chloride, and the zinc metal production step has an electrolysis step of electrolysis using anhydrous molten purified zinc chloride as an electrolytic bath. Therefore, it is possible to stably mass-produce zinc metal of higher purity with higher yield.

Further, according to the method of producing zinc metal in the tenth aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A method of manufacturing a zinc-containing solution producing step is a zinc extraction step of generating a zinc-containing solution to selectively extract zinc component from the raw material, evaporated residue is contacted with chlorine gas in the zinc extraction step The method comprises a selective chlorination step of selectively chlorinating a zinc component to form zinc chloride, and a dissolution step of dissolving zinc chloride in water to form a zinc chloride aqueous solution, and the purified zinc chloride generation step comprises Contacting iron with an alkaline agent and an oxidizing agent to separate iron and manganese components in aqueous zinc chloride solution, and removing noble metal from zinc in aqueous zinc chloride solution from which iron and manganese components are separated. In a substitution step of reducing and precipitating metal impurity components, a zinc separation step of separating a zinc component as a zinc-containing compound from a zinc chloride aqueous solution subjected to the substitution step, and in a zinc-containing compound And a zinc chloride process for producing a purified zinc chloride by salinating a zinc component, wherein the anhydrous melt-refined zinc chloride production process dehydrates the purified zinc chloride in a molten state to produce an anhydrous melt-refined zinc chloride And, since the step of producing the zinc metal has an electrolysis step of electrolyzing anhydrous molten purified zinc chloride as an electrolytic bath, mass production of zinc metal of higher purity can be carried out stably with higher yield. it can.

Further, according to the method of manufacturing zinc metal in the eleventh aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A method of manufacturing a zinc-containing solution producing step is, raw materials have a hydrochloric acid leaching step to produce an aqueous solution of zinc chloride salified zinc component by contacting an aqueous solution of hydrochloric acid, purified zinc chloride generation step, zinc chloride An iron and manganese removal step of contacting an aqueous solution with an alkali agent and an oxidant to separate iron and manganese components in an aqueous zinc chloride solution, and nobler than zinc in an aqueous zinc chloride solution from which iron and manganese components are separated. Step of reducing and precipitating metal impurity components, concentration step of evaporating and concentrating the aqueous solution of zinc chloride on which metal impurity components are reductively precipitated to form purified zinc chloride, and zinc chloride from which iron and manganese components are separated Separating the zinc component from the aqueous solution as a zinc-containing compound and returning it to the iron removal manganese removal step; It has a dehydration step of dehydrating purified zinc chloride in a molten state to form anhydrous molten purified zinc chloride, and the zinc metal production step has an electrolysis step of electrolysis using anhydrous molten purified zinc chloride as an electrolytic bath. Therefore, zinc chloride as a zinc-containing compound is preferentially generated as an aqueous solution from electric furnace dust as a raw material or secondary dust, and at least one of a carbonate, a hydroxide and an oxide formed from a zinc component in the raw material. Based on the production concept of purifying zinc chloride using zinc-containing compounds in the form to form zinc ingot, zinc ingot having a purity equivalent to 99.995% can be mass-produced stably with high yield .

Further, according to the method of producing zinc metal in the twelfth aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A manufacturing method of zinc-containing aqueous solution produced step, and zinc extraction step the zinc component from the material selectively extracting and generating a zinc-containing solution, the residue is contacted with an aqueous solution of hydrochloric acid in the zinc extraction step with zinc A leaching step of hydrochloric acid to produce an aqueous solution of zinc chloride which is a chlorinated component, and the step of producing a purified zinc chloride comprises contacting the aqueous solution of zinc chloride with an alkaline agent and an oxidizing agent to obtain an iron component and a manganese component in the aqueous zinc chloride solution. Removal step of separating iron, substitution step of reducing and depositing metal impurities more noble than zinc in an aqueous solution of zinc chloride from which iron and manganese components are separated, and zinc chloride formed by reduction precipitation of metal impurities The aqueous solution is evaporated and concentrated to form purified zinc chloride, and the zinc component is separated from the zinc-containing aqueous solution as a zinc-containing compound to remove iron A zinc separation step to be brought back to a certain extent, and the anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating purified zinc chloride in the molten state to produce anhydrous melt-refined zinc chloride; However, since it has the electrolysis process of electrolyzing anhydrous molten refined zinc chloride as an electrolytic bath, it is possible to stably mass-produce zinc metal of higher purity with high yield.

Further, according to the method of producing zinc metal in the thirteenth aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A method of manufacturing a zinc-containing solution producing step is, raw materials have a hydrochloric acid leaching step to produce an aqueous solution of zinc chloride salified zinc component by contacting an aqueous solution of hydrochloric acid, purified zinc chloride generation step, zinc chloride An iron and manganese removal step of contacting an aqueous solution with an alkali agent and an oxidant to separate iron and manganese components in an aqueous zinc chloride solution, and nobler than zinc in an aqueous zinc chloride solution from which iron and manganese components are separated. Step of reducing and precipitating metal impurity components, zinc separation step of separating the zinc component as a zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step, and salifying the zinc component in the zinc-containing compound to form purified zinc chloride Forming an anhydrous molten purified zinc chloride to dehydrate the purified zinc chloride in a molten state to form anhydrous molten purified zinc chloride Since it has a water process and a zinc metal production process has an electrolysis process to electrolyze anhydrous molten refined zinc chloride as an electrolytic bath, mass production of zinc metal with higher purity can be stably performed with high yield. Can.

Further, according to the method for producing zinc metal in the fourteenth aspect of the present invention, the secondary dust generated when the electric furnace dust or the electric furnace dust is reduced by a reduction furnace is used as a raw material to contain the zinc component in the raw material. The zinc-containing aqueous solution producing step of producing a zinc-containing aqueous solution, and the zinc component in the zinc-containing aqueous solution is purified while using a zinc-containing compound as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide. Process for producing purified zinc chloride containing zinc chloride, and anhydrous melting for producing anhydrous molten purified zinc chloride containing anhydrous purified molten zinc chloride by anodizing purified zinc chloride A zinc metal comprising: a step of producing purified zinc chloride; and a step of producing zinc ingot for producing zinc ingot as an electrolytic product by electrolyzing anhydrous molten refined zinc chloride. A manufacturing method of zinc-containing aqueous solution produced step, and zinc extraction step the zinc component from the material selectively extracting and generating a zinc-containing solution, the residue is contacted with an aqueous solution of hydrochloric acid in the zinc extraction step with zinc A leaching step of hydrochloric acid to produce an aqueous solution of zinc chloride which is a chlorinated component, and the step of producing a purified zinc chloride comprises contacting the aqueous solution of zinc chloride with an alkali agent and an oxidizing agent to obtain an iron component and a manganese component Removal step of separating iron, zinc substitution from zinc chloride aqueous solution which has undergone a substitution step, reduction step of reducing and precipitating metal impurity component which is nobler than zinc in zinc chloride aqueous solution from which iron component and manganese component are separated Separating zinc as a zinc-containing compound, and zinc-chlorination in which the zinc component in the zinc-containing compound is salified to form purified zinc chloride An anhydrous molten purified zinc chloride production step has a dehydration step of dehydrating purified zinc chloride in a molten state to form anhydrous molten purified zinc chloride, and a zinc metal production step uses anhydrous molten purified zinc chloride as an electrolytic bath Since it has an electrolysis process for electrolysis, higher purity zinc metal can be mass-produced stably with high yield.

Claims (15)

A zinc-containing aqueous solution generation step of generating an electric furnace dust or a secondary dust generated when the electric furnace dust is reduced by a reduction furnace as a raw material to generate a zinc-containing aqueous solution containing a zinc component in the raw material;
The purified zinc chloride containing zinc chloride purified using the zinc component in the zinc-containing aqueous solution as a zinc-containing compound of at least one form of carbonate, hydroxide and oxide, and using the zinc-containing compound A step of producing purified zinc chloride to be produced;
An anhydrous melt-refined zinc chloride producing step of producing an anhydrous melt-refined zinc chloride containing the anhydrated melt-refined zinc chloride by anodizing the purified zinc chloride;
A step of producing zinc metal, wherein zinc metal is produced as an electrolytic product by electrolyzing the anhydrous molten refined zinc chloride;
A method of producing zinc ingots comprising: The zinc-containing aqueous solution production step has a zinc extraction step of selectively extracting the zinc component from the raw material to produce the zinc-containing aqueous solution,
The purified zinc chloride production step is a zinc separation step of separating the zinc component as the zinc-containing compound from the zinc-containing aqueous solution, and the zinc component in the zinc-containing compound is chlorinated to produce the purified zinc chloride And a chlorination step,
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath.   The zinc according to claim 2, further comprising a substitution step of bringing metallic zinc into contact with the zinc-containing aqueous solution generated in the zinc extraction step to reduce and deposit a metallic impurity component nobler than zinc in the zinc-containing aqueous solution. How to make bullion. A deferrous-demanganizing step of contacting an oxidizing agent with the zinc-containing aqueous solution produced in the zinc extraction step to separate an iron component and a manganese component in the zinc-containing aqueous solution;
A displacement step of bringing metal zinc into contact with the zinc-containing aqueous solution subjected to the deferrous-demanganese-removing step to reduce and deposit a metal impurity component nobler than zinc in the zinc-containing aqueous solution;
The method for producing zinc metal according to claim 2, further comprising In the zinc chlorination step, the zinc-containing compound is brought into contact with an aqueous solution of hydrochloric acid to produce a purified zinc chloride aqueous solution which is an aqueous solution of the purified zinc chloride, and
Placing metal zinc in contact with the purified zinc chloride aqueous solution to reduce and deposit a metal impurity component nobler than zinc in the purified zinc chloride aqueous solution;
A concentration step of evaporating and concentrating the purified zinc chloride aqueous solution subjected to the substitution step;
The method for producing zinc metal according to claim 2, further comprising The method further comprises a deironing / demanganation step of contacting the purified zinc chloride aqueous solution generated in the zinc chloride step with an oxidizing agent to separate an iron component and a manganese component in the zinc chloride aqueous solution,
The method for producing zinc ingot according to claim 5, wherein the metallic zinc is brought into contact with the purified zinc-containing aqueous solution which has undergone the deferrous-demanganese-removing step in the substitution step. In the zinc-containing aqueous solution production step, the raw material is contacted with chlorine gas and evaporated to selectively chloride the zinc component to form zinc chloride, and the zinc chloride is dissolved in water to dissolve the zinc chloride aqueous solution Producing a dissolution step to produce
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Replacement step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and evaporating and concentrating the zinc chloride aqueous solution in which the metal impurity component is reduced and precipitated, the purified zinc chloride And a zinc separation step of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution from which the iron component and the manganese component are separated, and returning it to the iron removal and manganese removal step. And
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath. In the zinc-containing aqueous solution production step, a zinc extraction step of selectively extracting the zinc component from the raw material to produce the zinc-containing aqueous solution, and a residue in the zinc extraction step are contacted with chlorine gas to evaporate the zinc A selective chlorination step of selectively chlorinating components to form zinc chloride, and a dissolution step of dissolving the zinc chloride in water to form an aqueous zinc chloride solution;
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Replacement step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and evaporating and concentrating the zinc chloride aqueous solution in which the metal impurity component is reduced and precipitated, the purified zinc chloride Concentrating the zinc-containing aqueous solution from the zinc-containing aqueous solution as a zinc-containing compound, and returning the zinc-removing step to the iron removal-manganese removal step;
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath. In the zinc-containing aqueous solution production step, the raw material is contacted with chlorine gas and evaporated to selectively chloride the zinc component to form zinc chloride, and the zinc chloride is dissolved in water to dissolve the zinc chloride aqueous solution Producing a dissolution step to produce
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Separation step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and zinc separation of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step And a step of chlorinating the zinc component in the zinc-containing compound to produce purified zinc chloride,
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath. In the zinc-containing aqueous solution production step, a zinc extraction step of selectively extracting the zinc component from the raw material to produce the zinc-containing aqueous solution, and a residue in the zinc extraction step are contacted with chlorine gas to evaporate the zinc A selective chlorination step of selectively chlorinating components to form zinc chloride, and a dissolution step of dissolving the zinc chloride in water to form an aqueous zinc chloride solution;
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Separation step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and zinc separation of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step And a step of chlorinating the zinc component in the zinc-containing compound to produce purified zinc chloride,
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath. The zinc-containing aqueous solution producing step has a hydrochloric acid leaching step of contacting the raw material with an aqueous solution of hydrochloric acid to produce an aqueous solution of zinc chloride with the zinc component being chlorinated,
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Replacement step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and evaporating and concentrating the zinc chloride aqueous solution in which the metal impurity component is reduced and precipitated, the purified zinc chloride And a zinc separation step of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution from which the iron component and the manganese component are separated, and returning it to the iron removal and manganese removal step. And
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath. The zinc-containing aqueous solution production step selectively extracts the zinc component from the raw material to produce the zinc-containing aqueous solution, and the residue in the zinc extraction step is brought into contact with an aqueous solution of hydrochloric acid to make the zinc component A hydrochloric acid leaching step to produce an aqueous solution of zinc chloride with
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Replacement step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and evaporating and concentrating the zinc chloride aqueous solution in which the metal impurity component is reduced and precipitated, the purified zinc chloride Concentrating the zinc-containing aqueous solution from the zinc-containing aqueous solution as a zinc-containing compound, and returning the zinc-removing step to the iron removal-manganese removal step;
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath. The zinc-containing aqueous solution producing step has a hydrochloric acid leaching step of contacting the raw material with an aqueous solution of hydrochloric acid to produce an aqueous solution of zinc chloride with the zinc component being chlorinated,
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Separation step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and zinc separation of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step And a step of chlorinating the zinc component in the zinc-containing compound to produce purified zinc chloride,
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath. The zinc-containing aqueous solution production step selectively extracts the zinc component from the raw material to produce the zinc-containing aqueous solution, and the residue in the zinc extraction step is brought into contact with an aqueous solution of hydrochloric acid to make the zinc component A hydrochloric acid leaching step to produce an aqueous solution of zinc chloride with
In the purified zinc chloride production step, the zinc chloride aqueous solution is brought into contact with an alkali agent and an oxidizing agent to separate iron and manganese components in the zinc chloride aqueous solution, and the iron component and manganese Separation step of reducing and depositing a metal impurity component nobler than zinc in the zinc chloride aqueous solution from which the component has been separated, and zinc separation of separating the zinc component as the zinc-containing compound from the zinc chloride aqueous solution subjected to the substitution step And a step of chlorinating the zinc component in the zinc-containing compound to produce purified zinc chloride,
The anhydrous melt-refined zinc chloride production step has a dehydration step of dehydrating the purified zinc chloride in a molten state to produce the anhydrous melt-refined zinc chloride,
The method for producing zinc ingot according to claim 1, wherein the step of producing zinc ingot has an electrolysis step in which the anhydrous molten purified zinc chloride is electrolyzed as an electrolytic bath.   The zinc alloy according to any one of claims 7, 8, 11 and 12, further comprising a zinc chlorination step of chlorinating the zinc component in the zinc-containing compound to form purified zinc chloride and sending it to the dehydration step. Production method.

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