KR20020020318A - Method for manufacturing sulfate zinc and manganese sulfate, ferrous sulfate from electric furnace dust of tin and zinc coatingplant and ferromanganese - Google Patents

Abstract

PURPOSE: A method for manufacturing zinc sulfate, manganese sulfate and ferrous sulfate from electric furnace dust of a steelmaking plant and ferromanganese is provided which further improves economic utility value of electric furnace dust by using ferromanganese and electric furnace dust containing 25% of iron and 25% of zinc as raw materials. CONSTITUTION: The method for manufacturing zinc sulfate zinc using electric furnace dust comprises a first process of forming sulfate in the solution by reacting the mixture for 2 to 3 hours after injecting electric furnace dust containing 25% of iron and 25% of zinc into an aqueous sulfuric acid solution; a second process of separating the solidified material by injecting oxygen, potassium permanganate or hydrogen peroxide into the sulfate formed electric furnace dust solution, thereby oxidizing iron so as to form the oxidized iron into a settling solidified material; a third process of separating the crystallized material by injecting 0.5 to 1.0% of zinc powder into the iron separated solution, thereby reducing heavy metals such as Pb and Cd so as to form the reduced heavy metals into a settling crystallized material; and a fourth process of obtaining zinc sulfate through the processing step of cooling or drying the iron and heavy metal removed solution. The method for manufacturing ferrous sulfate comprises the processing step of cooling or drying the resulting material by reducing and filtering the materials obtained after reacting iron contained slurry with an aqueous sulfuric acid solution.

Description

Method for manufacturing sulfate zinc and manganese sulfate, ferrous sulfate from electric furnace dust of tin and zinc coatingplant and ferromanganese}

The present invention relates to a method for producing zinc sulfate, manganese sulfate and ferrous sulfate from an electric furnace and ferro manganese steel mill.

Since electric mills in steel mills are landfilled as by-products, they are polluting the soil and causing excessive landfill costs.

The present invention manufactures zinc sulfate, manganese sulfate and ferrous sulfate from steel mill electric furnace and ferro manganese containing 25% iron and 25% zinc, and thus the economic utilization value of the steel mill electric furnace. To improve.

This will be described in more detail as follows.

In the present invention, the electric furnace of the steel mill, which contains 25% of zinc and 25% of iron, is added to a sulfuric acid solution and reacted for 2-3 hours to form sulfate in the solution.

Oxygen, air or permanganate (1.5-2.0%), hydrogen peroxide, etc. are added to the sulfate-formed electric furnace solution to oxidize iron to form precipitated coagulant, which prevents it from passing through the filtering network. Isolate the iron

0.5-1.0% of zinc powder is added to the iron-separated solution to replace heavy metals (pb, cd, etc.) with metal zinc powder to form crystals. and

The solution from which iron and heavy metals have been removed is collected and cooled or dried to obtain zinc sulfate, zinc sulfate, ferromanganese and scrap iron in the remaining slurry, and reacted with aqueous sulfuric acid solution for 3 hours. By forming manganese to replace heavy metals with zinc powder to form a crystal, it is precipitated and separated by a method that does not pass through the filtering network during filtration. The filtered solution is concentrated to dryness to produce ferrous sulfate and manganese sulfate. .

Example <1>

1 ton of electric roaster containing 25% of iron and 25% of zinc was added to 1.8ton of aqueous sulfuric acid solution (60-70% aqueous solution of sulfuric acid) and reacted for 3 hours. 20kg of permanganate was added for 1 hour, followed by filtration through a filter. 5kg of zinc powder was added to the filtered solution, and after 2 hours, the solution was filtered to obtain a solution in which iron and lead components were separated, stored in a storage tank, and dried in a spray dryer to obtain 680kg of zinc sulfate. The solution was cooled and dehydrated. As a result, 1200 kg of lactate zinc sulfate was obtained.

Subsequently, the slurry was reacted with an aqueous sulfuric acid solution (sulfuric acid content of 60-70%) for 2-3 hours, and then, the filtered iron sulfate solution was reduced to scrap iron, followed by filtration of heavy metals with zinc powder, followed by drying to obtain 680 kg of iron sulfate. 1200kg iron sulphate can be obtained.

Example <2>

1 ton of electric roaster was added to 1.8 ton of sulfuric acid aqueous solution (60% sulfuric acid solution) and reacted for 4 hours. Air was added for 30 m ² for 2 hours. After filtration, zinc powder (15 kg) was added. The dried solution was concentrated to dryness to obtain zinc sulfate (35% zinc), and 1200kg of zinc sulfate in the lactate state was obtained by dehydrating solution cooling crystals.

Example <3>

1 ton of electric furnace was added to 1.8ton of aqueous sulfuric acid solution (60-70% sulfuric acid) and reacted for 3 hours. After adding hydrogen peroxide (90kg) for 1 hour, the solution was filtered, and 75kg of zinc powder was added. Zinc sulfate (zinc 31%) was obtained by concentrating and drying the solution separated from the heavy metals (pb, cd) and 1200kg of zinc sulfate in the lactate state, which was cooled and dehydrated.

Example <4>

1ton of electric roaster was added to 1.8ton of aqueous sulfuric acid solution (sulfuric acid content 60%) and reacted for 4 hours. After adding 155kg of oxygen for 1 hour, adding zinc powder (15kg) to the solution after stirring, and filtering the solution after 2 hours, iron component was filtered. Zinc sulfate (35% zinc) was obtained by concentrating and drying the solution separated from heavy metals (pb, cd), and 1200kg of zinc sulfate in the lactate state of cooling crystals.

Example <5>

1ton of electric roaster was added to 1.8ton of aqueous sulfuric acid solution (sulfuric acid content 60-70%), reacted for 4 hours, reduced by adding 150kg of scrap iron, and replaced by zinc powder (5kg). You can get

Example <6>

Put 1ton of electric roaster into 1.8ton of aqueous sulfuric acid solution (60-70% sulfuric acid), react for 4 hours, add 150Kg of ferro-manganese, replace it with zinc powder (5Kg), filter, dry and concentrate. 1390 Kg could be obtained.

In the present invention as described above, by reacting the electric furnace and ferro-manganese in dilute sulfuric acid solution to form a sulfate in the solution, such as zinc sulfate, iron sulfate, manganese sulfate, and added permanganate before filtering the solution Oxide can form precipitated coagulum to prevent iron from passing through the filter network so that the iron can be separated by filtering the solution. Zinc powder is added to the solution where the iron is separated and heavy metals (pb, cd, etc.) ) Is a sedimentable crystal which can be precipitated to prevent heavy metals from passing through the filter network, filtering the solution to filter the heavy metals, thereby separating iron and heavy metals from the solution.

Therefore, when the final solution is dried, zinc sulfate powder with iron or lead components removed can be obtained. If crystallized by cooling, dehydrated zinc zinc sulfate can be produced. When the slurry is filtered after reacting with aqueous sulfuric acid solution, iron sulfate powder can be obtained. When dehydrated with cooling crystals, iron sulfate in the lactate state can be produced, and ferrous manganese is added after reduction, ferro-manganese is added, zinc powder is added, the solution is concentrated and dried, and iron sulfate, zinc sulfate, and manganese sulfate are impregnated. It can be manufactured.

Claims (4)

The first step of forming an electric furnace containing 25% iron and 25% zinc in an aqueous solution of sulfuric acid and reacting for 2-3 hours to form sulfate in the solution; air (oxygen) or Fermented permanganate is added to hydrogen peroxide to oxidize the iron component to form precipitated coagulant and to separate it from the solution, and add 0.5-1.0% of zinc powder into the separated iron solution. , cd) is replaced with precipitated crystals to form a precipitate, and the third step of separating from the solution, and the fourth step of obtaining zinc sulfate through a process for cooling or drying the solution from which iron and heavy metals are removed. Method for producing zinc sulfate with an electric furnace produced by Process for producing iron sulfate through a process in which iron slurry is reacted with a sulfuric acid solution, reduced, filtered and then cooled or dried An electric furnace containing 25% iron and 25% zinc is added to an aqueous sulfuric acid solution and reacted for 2-3 hours to form iron sulfate and zinc sulfate in the solution, which is then reduced to metallic iron (scrap iron). Method for preparing iron sulfate zinc sulfate to concentrate the dried filtrate An electric furnace with 25% iron and 25% zinc is added to an aqueous solution of sulfuric acid and reacted for 3 hours to form iron sulfate and zinc sulfate in the solution, followed by reduction to ferro manganese (metal manganese). A method for producing ferrous sulfate, manganese sulfate, and zinc sulfate in which the pb, cd) substitutional filtrate is concentrated and dried in a state of immersion.