A process for deep purification and impurity removal of wet zinc leaching solution

Abstract

The invention discloses a process for deep purification and impurity removal of wet zinc leaching liquid. The process uses zinc sulfide solution to carry out deep purification and removal of impurities on wet zinc leaching liquid, wherein the zinc sulfide solution is purified and contains zinc sulfate Houli and barium sulfide are prepared as raw materials through metathesis reaction, and barium sulfide is prepared from barium sulfate through reduction reaction. In the process of the present invention, the zinc leaching solution to be purified is treated with the zinc sulfide solution as an impurity removal agent, and the sulfide ion released from the zinc sulfide reacts with heavy metal ions such as Cu, Cd, and As in the zinc leaching solution to precipitate in the form of precipitation. Purification and removal of impurities in zinc liquid has the advantages of low processing cost, environmental protection, low zinc loss rate, and good purification effect. It can realize deep purification and removal of impurities in wet zinc leaching liquid. A new impurity removal process for thoroughly purifying wet zinc leaching solution has high use value and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of zinc hydrometallurgy purification and impurity removal, and relates to a process for deep purification and impurity removal of wet zinc leaching liquid. Background technique [0002] Zinc leaching solution, such as zinc sulfate leaching solution, will be produced in the production process of zinc hydrometallurgy. At present, for the method of purifying and removing impurities in the zinc sulfate leach solution, the zinc powder replacement method is mainly used to remove impurity metals such as copper, cadmium, and cobalt in stages, so as to achieve the purpose of purifying and removing impurities in the zinc sulfate leach solution. The advantage of the zinc powder replacement method is that the process is simple and the operation is convenient; the disadvantage is that the utilization rate of the zinc powder is low, the price of the zinc powder is expensive, and the economic benefit is not high, and the c...

AI Technical Summary

Problems solved by technology

The defects in this patented technology are: (1) industrial zinc sulfate heptahydrate and high-grade sodium sulfide are used as raw materials for preparing zinc sulfide, and these raw materials are used in large quantities and expensive, resulting in high raw material costs; A large amount of vulcanized liquid is produced in the process, which has the risk of secondary pollution. At the same time, when the vulcanized liquid is disposed of separately, there are also problems of high disposal cost, easy to cause water expansion of the system and solid waste, and these new pollutions are also There is bound to be a risk of secondary pollution, and the disposal of these new pollutions will inevitably require additional disposal costs, which will further increase the disposal cost, which will further increase the process cost of purifying the zinc sulfate solution; The sodium sulfate contained cannot be effectively converted into sodium sulfide, so the recycling of waste cannot be realized, and the economic benefit is poor

The defects in this patented technology are: (a) solid zinc sulfate and calcium sulfide are used as raw materials for the preparation of zinc sulfide, which consume a large amount and cost high; (b) a large amount of solid waste residue is produced in the process of preparing zinc sulfide Calcium sulfate has the risk of secondary pollution. At the same time, additional disposal costs will be required when the solid waste calcium sulfate is disposed of separately, which will further increase the disposal cost. (c) A large amount of solid waste calcium sulfate cannot be effectively converted into calcium sulfide, so the recycling of waste cannot be realized, and the economic benefit is poor

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