WO2015030235A1 - 電炉ダストを原料とする亜鉛製造方法 - Google Patents
電炉ダストを原料とする亜鉛製造方法 Download PDFInfo
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- WO2015030235A1 WO2015030235A1 PCT/JP2014/072931 JP2014072931W WO2015030235A1 WO 2015030235 A1 WO2015030235 A1 WO 2015030235A1 JP 2014072931 W JP2014072931 W JP 2014072931W WO 2015030235 A1 WO2015030235 A1 WO 2015030235A1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
- C25C3/34—Electrolytic production, recovery or refining of metals by electrolysis of melts of metals not provided for in groups C25C3/02 - C25C3/32
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/20—Obtaining zinc otherwise than by distilling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/30—Obtaining zinc or zinc oxide from metallic residues or scraps
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B19/00—Obtaining zinc or zinc oxide
- C22B19/32—Refining zinc
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
- C25B1/00—Electrolytic production of inorganic compounds or non-metals
- C25B1/01—Products
- C25B1/24—Halogens or compounds thereof
- C25B1/26—Chlorine; Compounds thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Definitions
- the present invention relates to a zinc production method, and in particular, when recycling electric furnace dust generated during melting and smelting of scrap in an electric furnace method, which is one of iron making processes, or electric furnace dust as an iron making raw material, non-ferrous raw material, or cement extender.
- the present invention relates to a zinc production method using dust generated in a reduction furnace (hereinafter referred to as secondary dust) as a raw material.
- electric furnace dust is generated as industrial waste containing zinc oxide components, about 1.5% to 2.0% of the steelmaking amount during scrap smelting and refining. To do. It is said that electric furnace dust is generated 7 million tons in the world and 500,000 tons in Japan.
- Examples of the main recycling technique for obtaining crude zinc oxide from electric furnace dust include the Wells furnace method, plasma method, electric smelting reduction method, MF furnace method, or rotating bed furnace method.
- crude zinc oxide produced by these recycling technologies is a raw material for dry and wet zinc smelting.
- Patent Document 1 discloses a method for recovering zinc metal from electric furnace dust containing zinc oxide generated from an electric furnace iron scrap smelting furnace, etc., regarding the zinc recovery method. Specifically, in Patent Document 1, electric furnace dust or secondary dust, metallic iron-containing powder, a reducing agent, a binder and water are mixed and kneaded, then molded, and further fired in a reducing furnace. Is disclosed. Thereby, in patent document 1, the zinc oxide in electric furnace dust or secondary dust is collect
- the composition of the recovered metal zinc is limited to a purity of 3N, and there is room for improvement in purity.
- the electric furnace dust can be used as an intermediate raw material called crude zinc oxide, but the crude zinc oxide is not carried into a large-scale zinc smelter at a cost of transportation. It can be said that there is no situation.
- crude zinc oxide is produced as secondary dust from electric furnace dust using a large-scale facility and using a lot of energy.
- electric furnace dust cannot be directly used in aqueous electrolysis, which is the mainstream of current zinc production methods, is that most zinc in the electric furnace dust is zinc ferrite that is hardly soluble in sulfuric acid. If it can be processed directly, a large energy saving can be realized.
- the present inventor has found that the above-mentioned problems can be solved by extracting the zinc component in the electric furnace dust or the secondary dust by the chlorination step and then purifying it by the molten salt electrolysis method through the above examination.
- the present invention has been found and completed.
- the present invention has been made in view of such circumstances, and is suitable for the treatment of electric furnace dust containing a large amount of chlorine without the need for additional costs for dechlorination, and manufactures high purity zinc ingots having a purity of 4N or more.
- An object of the present invention is to provide a zinc production method that can be operated with a compact apparatus.
- electric furnace dust or secondary dust is brought into contact with a mixed gas containing chlorine gas and oxygen-containing gas, and the zinc oxide component in the electric furnace dust or secondary dust is converted into zinc chloride and vaporized.
- the zinc oxide component in the electric furnace dust or secondary dust is converted into zinc chloride and vaporized.
- extraction as crude zinc chloride vapor it is refined to form purified zinc chloride in the molten state, and this is further processed by molten salt electrolysis, thereby obtaining high purity zinc metal with a purity of 4N or more.
- the basic content is to do.
- the electric furnace dust or secondary dust containing zinc oxide and the mixed gas containing chlorine gas and oxygen-containing gas are brought into contact with each other, so that the iron component in the electric furnace dust or secondary dust is slightly increased.
- the zinc component in the electric furnace dust or secondary dust can be selectively salified and vaporized.
- chlorination of secondary dust consisting almost of crude zinc oxide
- chlorination using either chlorine gas alone or mixed gas containing chlorine gas and oxygen-containing gas is possible, but in the case of electric furnace dust, zinc ferrite is used. It needs to be chlorinated.
- thermodynamic examination it has been found by thermodynamic examination that this is possible if a mixed gas containing chlorine gas and oxygen-containing gas is used, and this has been confirmed by experiments.
- the zinc chloride component contained in the crude zinc chloride vapor obtained in the chlorination step is separated from components other than zinc chloride contained in the crude zinc chloride vapor to obtain purified zinc chloride.
- components other than zinc chloride iron chloride produced by chlorination of some iron oxides, lead chloride derived from raw materials, alkali chloride, and the like can be considered.
- a distillation process or a reduction process it is preferable to employ a distillation process or a reduction process, and a combined purification process executed in this order by combining the distillation process and the reduction process may be employed.
- purified zinc chloride is obtained by distilling the melt containing the zinc chloride component contained in the crude zinc chloride vapor.
- the zinc chloride component in the crude zinc chloride vapor is separated from the metal chloride component other than zinc chloride by utilizing the vapor pressure difference, and as a result, the zinc chloride component can be purified. it can.
- a reducing agent is added to a crude zinc chloride melt or a molten mixed salt of crude zinc chloride and an alkali chloride or alkaline earth chloride. It is possible to purify the zinc chloride component by reducing and precipitating noble metal impurity components.
- the base metal component may be contained in it in zinc.
- the molten salt electrolytic bath is a chloride, even if the raw material contains a chlorine component, no additional cost for dechlorination as in the conventional method is required. It is convenient for the treatment of electric furnace dust and the like that contain a lot.
- the current density is about 500 A / m 2 in the existing aqueous solution electrolysis per 1 m 2 of the electrode surface area.
- a productivity of 5000 A / m 2 or more and 10 times the productivity can be obtained, and the equipment can be made compact.
- the temperature of the electrolytic bath is set to be equal to or higher than the melting point of metal zinc, zinc metal that is electrolytically deposited is melted from the bottom of the electrolytic cell by an inert gas such as nitrogen gas.
- the zinc production method brings an electric furnace dust or secondary dust containing zinc oxide into contact with a mixed gas containing chlorine gas and oxygen-containing gas.
- the zinc oxide component in the electric furnace dust or the secondary dust is converted into zinc chloride and vaporized to obtain a crude zinc chloride vapor, and the zinc chloride component contained in the crude zinc chloride vapor is converted into the crude zinc chloride.
- a purification step for obtaining purified zinc chloride by separating from components other than zinc chloride contained in the vapor; and an electrolysis step for electrolyzing a molten salt electrolytic bath in which the purified zinc chloride is melted to obtain a zinc melt and chlorine gas; Have.
- the crude zinc chloride vaporized and separated from the electric furnace dust in the chlorination process is condensed and liquefied at a specific condensation temperature, for example, a temperature range of about 380 ⁇ 5 ° C. near the melting point of zinc chloride. Is preferably used. Furthermore, a method of purifying a part or all of purified zinc chloride once condensed and liquefied in order to obtain high purity zinc chloride by repeating re-evaporation and condensation is also preferably used.
- one or a plurality of cooling units for the purpose of liquefaction inside the chlorination reactor, or condensate liquefaction and reflux, and a liquid receiver arranged so as not to mix crude zinc chloride are used. May be.
- different temperature settings can be made, and more accurate separation and purification can be achieved.
- the crude zinc chloride vaporized and discharged from the chlorination reactor may be condensed and / or distilled in another device outside the chlorination reactor.
- the purification step is a distillation in which the purified zinc chloride is obtained by distilling a melt containing the zinc chloride component contained in the crude zinc chloride vapor.
- the second aspect includes a purification step. Distillation here can be implemented by the specific example etc. which were mentioned above.
- the refining step includes the step of adding the reducing agent to the melt containing the zinc chloride component contained in the crude zinc chloride vapor. It is a third aspect to include a reductive purification step to obtain
- the purification step obtains primary purified zinc chloride by distilling a melt containing a zinc chloride component contained in the crude zinc chloride vapor.
- the present invention has a fifth aspect that the chlorine gas is obtained by electrolysis in the electrolysis step.
- the present invention has a sixth aspect that air is used as the oxygen-containing gas.
- the present invention has a seventh aspect in which the reducing agent is powdered metallic zinc.
- the present invention provides the zinc chloride component contained in the crude zinc chloride vapor and the alkali chloride or alkaline earth in the reduction and purification step.
- the eighth aspect is to add the reducing agent to a molten salt obtained by mixing and melting chloride.
- the present invention provides the molten salt electrolytic bath in which the refined zinc chloride and an alkali chloride or an alkaline earth chloride are mixed and melted in the electrolysis step.
- the ninth aspect is to electrolyze.
- the zinc oxide component is preferentially used in the chlorination step without chlorinating most of the iron oxide component in the zinc ferrite and the free iron oxide present alone.
- the zinc chloride component contained in the crude zinc chloride vapor obtained in the chlorination process is separated from components other than the zinc chloride contained in the crude zinc chloride vapor, and the purified zinc chloride melt is separated.
- the molten salt electrolysis method can be performed using the purified zinc chloride melt obtained in the purification process, so that no additional cost for dechlorination is required and chlorine is removed. It is suitable for processing a large amount of electric furnace dust and the like, and can produce a zinc ingot having a purity of 4N or higher and a zinc production method that can be operated with a compact apparatus.
- the vapor pressure difference between zinc chloride and other metal chlorides is separated to obtain crude zinc chloride vapor. Since the zinc chloride component contained therein can be purified, purified zinc chloride can be obtained simply and efficiently.
- the metal impurity component nobler than zinc in the zinc chloride melt is reduced and precipitated as a solid in the reduction and purification step, and the crude zinc chloride vapor Since the contained zinc chloride component can be purified, purified zinc chloride can be obtained simply and efficiently.
- the zinc production method of the fourth aspect of the present invention there is a reduction purification step after the distillation purification step and before the electrolysis step, and in the reduction purification step, the distillation purification in a molten state is performed.
- the chlorine gas is obtained by electrolysis in the electrolysis step, whereby the zinc production method is closed to reduce the generation of waste. it can.
- air is used as the oxygen-containing gas, thereby eliminating the necessity of separately providing an oxygen gas supply source and supplying the air present in the surroundings. It can be simply introduced into the chlorination step via a pump.
- the reducing agent is powdery metallic zinc, so that the metal impurity component nobler than zinc in the zinc chloride melt can be reliably reduced and precipitated.
- the zinc chloride component contained in the crude zinc chloride vapor can be purified.
- the zinc chloride component contained in the crude zinc chloride vapor and the alkali chloride or alkaline earth chloride are mixed and melted in the reduction purification step.
- the alkali chloride or alkaline earth chloride functions as a supporting salt in the molten salt electrolytic bath in the subsequent electrolysis step.
- the molten salt electrolytic bath The viscosity, electrical resistance, and vapor pressure of can be optimized, and the electrolysis efficiency can be improved.
- the zinc production method of the ninth aspect of the present invention in the electrolysis step, by using a molten salt electrolytic bath in which purified zinc chloride and alkali chloride or alkaline earth chloride are mixed and melted, a molten salt is obtained.
- the alkali chloride or alkaline earth chloride functions as a supporting salt.
- FIG. 1 is a diagram showing a process of a zinc production method according to an embodiment of the present invention.
- a mixed gas containing chlorine gas 8 and oxygen-containing gas 10 is brought into contact with electric furnace dust 1 or secondary dust 1 in a chlorination furnace (not shown).
- a chlorination furnace not shown
- the zinc oxide component in the electric furnace dust 1 or the secondary dust 1 is obtained as the crude zinc chloride vapor 3
- the iron component in the electric furnace dust 1 or the secondary dust 1 remains solid without being salified.
- the chlorination step 101 is a reaction step for obtaining the crude zinc chloride vapor 3 from the zinc oxide component in the electric furnace dust 1 or the secondary dust 1. Table 1 below shows the composition of the secondary dust 1.
- the chlorination step 101 powdered electric furnace dust 1 or powdered secondary dust 1 is accommodated in the chlorination furnace, and the accommodated powdered electric furnace dust 1 or powdery 2 is stored. From the bottom side of the next dust 1, chlorine gas 8 or a mixed gas containing chlorine gas 8 and oxygen-containing gas 10 is blown.
- a reaction in which the oxygen component constituting the metal oxide in the electric furnace dust 1 or the secondary dust 1 is replaced with chlorine proceeds to obtain the crude zinc chloride vapor 3, and the oxygen gas 2 is added to the secondary gas.
- Born Regarding the metal component such as iron contained in the electric furnace dust 1 or the secondary dust 1, a part of the metal component is extracted together with the zinc component and mixed in the crude zinc chloride vapor 3 as iron chloride gas, while the remainder is Isolated as residue 4.
- Fe / Zn is 1.99, which almost coincides with the stoichiometric ratio of 2.0.
- iron oxide was concentrated in the residue, and iron was about 0.3% of zinc in the collected salt. This revealed that zinc was selectively salified.
- this iron-rich residue may be used as a raw material when producing pig iron. In this case, the waste can be effectively recycled.
- the purification step (distillation purification step) 102 the crude zinc chloride vapor 3 obtained through the chlorination step 101 is distilled and purified to obtain a purified zinc chloride melt 6.
- the crude zinc chloride vapor 3 is accommodated in a distillation apparatus that is lined with ceramics such as alumina and silicon carbide that are corrosion resistant to high-temperature metal chlorides and is not shown. Then, the purified zinc chloride melt 6 is separated using the difference in vapor pressure due to the difference in chloride. At this time, the metal chloride component 5 having a lower boiling point than that of zinc chloride and the metal chloride component 7 having a higher boiling point are separated from the zinc chloride vapor.
- the purified zinc chloride melt 6 obtained through the distillation purification step 102 is accommodated in an electrolysis tank (not shown) and electrolyzed to obtain a metal zinc melt 9 and chlorine gas 8 As a by-product.
- an electrolytic cell used in the electrolysis process 103 the electrolytic cell which accommodated the carbon electrode in the container lined with ceramics can be used as an example.
- oxygen-containing gas 10 used in the chlorination step 101 air present in the surroundings that can be easily supplied by a pump or the like may be used instead of a special oxygen gas source.
- a molten salt electrolytic bath obtained by mixing and melting the purified zinc chloride melt 6 and alkali chloride or alkaline earth chloride may be used.
- the alkali chloride or alkaline earth chloride functions as a supporting salt, and the viscosity, electric resistance and vapor pressure of the molten salt electrolytic bath can be optimized, and the electrolytic efficiency Can be improved.
- this alkali chloride or alkaline earth chloride it is more preferable to use sodium chloride from the viewpoint of the property and cost as the supporting salt.
- the zinc production method of the present embodiment is suitable for the treatment of electric furnace dust containing a large amount of chlorine without the need for additional costs for dechlorination, and produces high purity zinc ingots having a purity of 4N or more.
- a zinc production method that can be operated with a compact apparatus can be realized.
- zinc oxide in zinc ferrite contained in the electric furnace dust 1 is also chlorinated by bringing the electric furnace dust 1 into contact with a mixed gas containing the chlorine gas 8 and the oxygen-containing gas 10. Can do. Therefore, most of the iron component 4 remains solid without being salified, and the zinc component can be selectively salified and vaporized.
- FIG. 2 is a process diagram of a modification of the zinc production method according to the present embodiment.
- the main difference is that the distillation purification step 102 in the above-described embodiment is replaced by a reduction purification step 104, and the remaining steps. Are the same.
- the crude zinc chloride vapor 3 obtained through the chlorination step 101 is reduced and purified to obtain a purified zinc chloride melt 6 '.
- the reducing agent 11 is added to the zinc chloride melt obtained from the crude zinc chloride vapor 3 obtained through the chlorination step 101, and the metal impurity component 12 that is nobler than zinc is added.
- a purified zinc chloride melt 6 ′ is obtained by reducing and precipitating.
- the reducing agent 11 is preferably powdered metallic zinc from the viewpoint of efficiently and reliably separating and separating the metal impurity component 12 that is nobler than zinc in the zinc chloride melt.
- the purified zinc chloride melt 6 'obtained through the reduction and purification step 104 is electrolyzed to obtain the metal zinc melt 9, and the chlorine gas 8 is by-produced. Further, the zinc melt 9 was cooled and solidified to obtain metallic zinc having a purity of 4N or higher.
- the reductive purification step 104 it is preferable to add a reducing agent to a molten salt obtained by mixing and melting an alkali chloride or an alkaline earth chloride in a zinc chloride melt.
- the alkali chloride or alkaline earth chloride functions as a supporting salt to optimize the viscosity, electrical resistance and vapor pressure of the molten salt electrolytic bath. And the electrolytic efficiency can be improved.
- this alkali chloride or alkaline earth chloride it is more preferable to use sodium chloride from the viewpoint of the property and cost as the supporting salt.
- a mixed molten salt obtained by mixing the tail solution after the electrolysis step 103 with the zinc chloride melt may be used.
- a reductive purification step 105 can be added after the distillation purification step 102.
- a reductive purification step 105 can be added after the distillation purification step 102.
- FIG. 3 is a process diagram of another modification of the zinc production method according to the present embodiment.
- a reduction purification step 105 is provided between the distillation purification step 102 and the electrolysis step 103 in the above-described embodiment. And the remaining steps are the same.
- the purified zinc chloride melt (primary purified zinc chloride melt) 6 obtained through the distillation purification step 102 is reduced and purified, and the purified zinc chloride melt 6 ′.
- ' (Secondary purified zinc chloride melt) is obtained.
- the reducing agent 11 is added to the primary purified zinc chloride melt 6 obtained through the distillation refining step 102 to precipitate and remove the metal impurity component 12 that is precious than zinc. As a result, a secondary purified zinc chloride melt 6 ′′ is obtained.
- the reduction purification process 105 is the same as the reduction purification process 104 in the above-described modification.
- the secondary purified zinc chloride melt 6 '' obtained through the reduction purification step 105 is electrolyzed to obtain the metal zinc melt 9, and the chlorine gas 8 is by-produced. Further, the zinc melt 9 was cooled and solidified to obtain metallic zinc having a purity of 4N or higher. Further, in this variation, the amount of heat consumed in each step of the distillation purification step 102 and the reduction purification step 105 and the consumption of the reducing agent can be complemented and optimized, so that the purity can be further reduced at a low cost. Highly purified zinc chloride can be obtained.
- the electric furnace dust having the composition shown in Table 4 below is converted into chlorine gas 8 and oxygen-containing gas in a vertical tubular furnace which is a reaction tube maintained at a reaction temperature of 900 ° C. 10 was brought into contact with the mixed gas.
- the zinc component is mainly extracted as zinc chloride from the electric furnace dust in the tubular furnace and evaporated and separated, and a residue mainly composed of non-volatile iron oxide remains in the lower part of the tubular furnace.
- the steam mainly composed of zinc chloride obtained in the chlorination process 101 was controlled so that its temperature was maintained at 380 ° C. ⁇ 5 ° C. in the upper part of the tubular furnace.
- the liquid was condensed and a primary purified zinc chloride melt 6 was obtained.
- the composition of the primary purified zinc chloride melt 6 obtained in the distillation purification step 102 is shown in Table 5 below, and the residue mainly composed of non-volatile iron oxide remaining in the lower part of the tubular furnace in the chlorination step 101 The composition of is shown in Table 6 below.
- the primary purified zinc chloride melt 6 obtained in the distillation purification step 102 is subjected to a gas phase pressure in the range of (atmospheric pressure ⁇ 10) Pa to (atmospheric pressure ⁇ 200) Pa.
- a gas phase pressure in the range of (atmospheric pressure ⁇ 10) Pa to (atmospheric pressure ⁇ 200) Pa.
- the temperature is maintained at 500 ° C. and kept in a heat-melted state, and about 1 weight with respect to the primary purified zinc chloride melt 6 in the heat-melted state.
- % Zinc powder was added and stirred while blowing nitrogen gas. Then, the supernatant of the melt obtained at this time was collected as a secondary purified zinc chloride melt 6 ′′.
- the composition of the secondary purified zinc chloride melt 6 '' is shown in Table 7 below.
- the secondary purified zinc chloride melt 6 '' obtained through the reduction purification step 105 is electrolyzed in an electrolytic cell in which the bath temperature is set to 500 ° C. and the carbon electrode is housed, A metal zinc melt 9 having the composition shown in Table 8 below was obtained.
- the electrolytic bath of the electrolytic cell is a mixed salt bath in which sodium chloride is added to the secondary purified zinc chloride melt 6 ′′, and the composition is shown in Table 9 below.
- the shape, material, arrangement, number, and the like of the constituent elements are not limited to the above-described embodiments, and the constituent elements of the present invention such as appropriately replacing the constituent elements with those having equivalent operational effects, etc. Of course, it can be appropriately changed without departing from the above.
- the present invention does not require additional cost for dechlorination and contains a lot of chlorine, and it is suitable for the treatment of electric furnace dust and the like in which zinc components are zinc ferrite which is difficult to be treated by a wet process, It is possible to produce high purity zinc ingots with a purity of 4N or more and to provide a zinc production method that can be operated with a compact device. It is expected that the present invention can be applied to an electric furnace dust generated during melting and smelting of scrap in a certain electric furnace method, or a zinc production method using secondary dust as a raw material.
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Abstract
Description
Claims (9)
- 酸化亜鉛を含む電炉ダスト又は前記電炉ダストを還元炉で還元した際に発生する2次ダストと、塩素ガス及び酸素含有ガスを含む混合ガスと、を接触させ、前記電炉ダスト又は前記2次ダストにおける酸化亜鉛成分を塩化亜鉛に転化すると共に気化させ、粗塩化亜鉛蒸気を得る塩化工程と、
前記粗塩化亜鉛蒸気に含まれる塩化亜鉛成分を、前記粗塩化亜鉛蒸気に含まれる塩化亜鉛以外の成分から分離して、精製塩化亜鉛を得る精製工程と、
前記精製塩化亜鉛を溶融した溶融塩電解浴を電解して亜鉛融液と塩素ガスとを得る電解工程と、
を備えた亜鉛製造方法。 - 前記精製工程は、前記粗塩化亜鉛蒸気に含まれていた塩化亜鉛成分を含む融液を蒸留することにより、前記精製塩化亜鉛を得る蒸留精製工程を含む請求項1に記載の亜鉛製造方法。
- 前記精製工程は、前記粗塩化亜鉛蒸気に含まれていた塩化亜鉛成分を含む融液に還元剤を添加することにより、前記精製塩化亜鉛を得る還元精製工程を含む請求項1に記載の亜鉛製造方法。
- 前記精製工程は、前記粗塩化亜鉛蒸気に含まれていた塩化亜鉛成分を含む融液を蒸留することにより、1次精製塩化亜鉛を得る蒸留精製工程、及び前記蒸留工程によって得た前記1次精製塩化亜鉛の融液に還元剤を添加することにより、2次精製塩化亜鉛を得る還元精製工程を含む還元精製工程を含む請求項1に記載の亜鉛製造方法。
- 前記塩素ガスは、前記電解工程における電解により得たものである請求項1から4のいずれかに記載の亜鉛製造方法。
- 前記酸素含有ガスとして、空気を用いる請求項1から5のいずれかに記載の亜鉛製造方法。
- 前記還元剤は、粉状の金属亜鉛である請求項3から6のいずれかに記載の亜鉛製造方法。
- 前記還元精製工程では、前記粗塩化亜鉛蒸気に含まれていた前記塩化亜鉛成分と、アルカリ塩化物又はアルカリ土類塩化物と、を混合溶融した溶融塩に、前記還元剤を添加する請求項3から7のいずれかに記載の亜鉛製造方法。
- 前記電解工程では、前記精製塩化亜鉛とアルカリ塩化物又はアルカリ土類塩化物とを混合溶融した前記溶融塩電解浴を電解する請求項1から8のいずれかに記載の亜鉛製造方法。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14839327.5A EP3042970A4 (en) | 2013-09-02 | 2014-09-01 | PROCESS FOR PRODUCING ZINC USING ELECTRIC OVEN DUST AS A RAW MATERIAL |
US14/915,811 US20160215407A1 (en) | 2013-09-02 | 2014-09-01 | Zinc production method using electric furnace dust as raw material |
CN201480055885.3A CN105637105A (zh) | 2013-09-02 | 2014-09-01 | 以电炉粉尘为原料的锌制造方法 |
JP2015534361A JP6099167B2 (ja) | 2013-09-02 | 2014-09-01 | 電炉ダストを原料とする亜鉛製造方法 |
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EP (1) | EP3042970A4 (ja) |
JP (1) | JP6099167B2 (ja) |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN108866320A (zh) * | 2018-07-16 | 2018-11-23 | 赫章县金川锌业有限公司 | 一种氯化联合工艺生产重质氧化锌和火法分离杂质的方法 |
CN113881975A (zh) * | 2021-10-19 | 2022-01-04 | 杭州嘉悦智能设备有限公司 | 熔盐氯化电解炉及其控制方法 |
Families Citing this family (5)
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WO2019005510A1 (en) | 2017-06-29 | 2019-01-03 | Langley Justin | OPERATION REFORMING NULL EMISSIONS |
WO2020103366A1 (zh) * | 2018-11-23 | 2020-05-28 | 北京科技大学 | 一种电解-氯化-电解制备纯钛的装置及方法 |
CN109267100B (zh) * | 2018-11-23 | 2021-01-15 | 北京科技大学 | 一种电解-氯化-电解制备纯钛的装置及方法 |
CN110257634B (zh) * | 2019-07-04 | 2021-04-02 | 湖南新威凌金属新材料科技股份有限公司 | 一种可回收氯化锌废液的锌粉生产装置 |
CN110938744B (zh) * | 2019-11-25 | 2021-04-02 | 重庆科技学院 | 一种炼钢粉尘资源回收过程中铅锌氯化物分离方法 |
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- 2014-09-01 JP JP2015534361A patent/JP6099167B2/ja active Active
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- 2014-09-01 WO PCT/JP2014/072931 patent/WO2015030235A1/ja active Application Filing
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JP2000290736A (ja) * | 1999-02-05 | 2000-10-17 | Nippon Magnetic Dressing Co Ltd | 電気炉ダストの処理方法 |
JP2002105550A (ja) | 2000-09-26 | 2002-04-10 | Takeshi Azagami | 亜鉛回収法 |
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Cited By (2)
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---|---|---|---|---|
CN108866320A (zh) * | 2018-07-16 | 2018-11-23 | 赫章县金川锌业有限公司 | 一种氯化联合工艺生产重质氧化锌和火法分离杂质的方法 |
CN113881975A (zh) * | 2021-10-19 | 2022-01-04 | 杭州嘉悦智能设备有限公司 | 熔盐氯化电解炉及其控制方法 |
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JP6099167B2 (ja) | 2017-03-22 |
JPWO2015030235A1 (ja) | 2017-03-02 |
EP3042970A1 (en) | 2016-07-13 |
CN105637105A (zh) | 2016-06-01 |
EP3042970A4 (en) | 2016-09-14 |
US20160215407A1 (en) | 2016-07-28 |
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