Production technique of zinc sulfate monohydrate

Abstract

The invention discloses a production technique of zinc sulfate monohydrate, which comprises the following steps: reacting zinc oxide and a sulfuric acid solution, carrying out pressure filtration to form a primary acid leaching solution and primary acid leaching slag, adding oxydol and zinc oxide into the primary acid leaching solution to oxidize and precipitate iron, adding the primary acid leaching slag into a sulfuric acid solution to perform secondary acid leaching, carrying out pressure filtration to form a secondary acid leaching solution and secondary acid leaching slag, adding scrap iron and P204 into the secondary acid leaching solution, reacting the secondary acid leaching solution and zinc oxide to perform iron removal and neutralization, adding zinc powder for replacement and purification, and adding the secondary acid leaching solution subjected to replacement and purification into the primary acid leaching solution; and carrying out triple effect evaporation crystallization by using hot vapor to obtain the zinc sulfate monohydrate crystal. The technique enhances the zinc content in the acid leaching solution, lowers the cadmium content in the acid leaching solution, improves the product quality, and enhances the raw material utilization ratio and product yield; and meanwhile, the acid leaching solution is subjected to triple effect evaporation crystallization to reduce the hot vapor required by evaporation crystallization, thereby lowering the thermal energy consumption.

Description

technical field [0001] The present invention relates to the production technology method of sulfate, particularly relate to the production technology method of zinc sulfate monohydrate. Background technique [0002] Zinc sulfate monohydrate is a white flowing powder, easily deliquescent in the air, easily soluble in water, slightly soluble in alcohol, insoluble in ketone, it is mainly used as the raw material for the manufacture of zinc barium powder and zinc salt, as well as viscose fiber and Pooh An important auxiliary material for fiber, it can also be used as printing and dyeing agent, wood and leather agent, bone glue clarifying and protecting agent, medical emetic and fungicide; it can be used for electroplating, flotation ore, preventing fruit tree seedling disease and circulating cooling water treatment It can also be used as fertilizer and feed additive, etc. It is a chemical product with a very wide range of uses. Zinc is one of the indispensable and important tra...

AI Technical Summary

Problems solved by technology

At present, the production process of zinc sulfate monohydrate mainly uses zinc oxide, sulfuric acid, hydrogen peroxide, and zinc powder as raw materials, and is prepared by acid leaching, oxidation iron removal, replacement cadmium removal and evaporation crystallization. This process mainly exists There are the following problems: the one is that zinc oxide and sulfuric acid raw materials adopt primary acid leaching, the zinc content in the acid leaching residue is high, the utilization rate of raw materials is low, and the output rate of zinc sulfate monohydrate is not high; the other is that zinc powder is used for primary replacement In addition to cadmium, the content of zinc in cadmium slag is high and the content of cadmium is low. Not only can zinc powder not be fully utilized, but also the content of cadmium in zinc sulfate monohydrate cannot meet the technical requirements of users; moreover, the heat energy consumed by evaporation and crystallization is high, and evaporation Crystallization waste heat cannot be fully utilized

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