Zinc electrolyte dechlorination method

Abstract

The invention discloses a zinc electrolyte dechlorination method. The zinc electrolyte dechlorination method includes the specific steps that low grade zinc oxide is subject to neutral leaching, thena leaching agent containing chlorine is injected into a dechlorination tank to be stirred, an antichlor, namely cuprous oxide is added in the stirring process, then industrial sulphuric acid is added,and dechlorination slag and dechlorination liquid are obtained; sampling is carried out for analysis of the copper content, iron powder is added according to the copper content, stirring is carried out while the iron powder is added, stirring lasts for 30 min-40 min, analysis of the copper content is carried out, filter pressing is carried out when the copper ion content is smaller than 0.1 g / L,and copper removal slag is obtained; the dechlorination slag and the copper removal slag are added into a reaction tank, then regenerated liquid is added, caustic soda flakes are added, the Ph is adjusted, a reaction is made for 3 h-4 h, and regenerated slag and a sodium chloride solution are obtained; and high chlorine water is added into the obtained sodium chloride solution, evaporation and concentration are firstly carried out to enable the high chlorine water to be close to a crystallization point of a sodium chloride, then cooling crystallization is carried out, sodium chloride powder and mother liquor are obtained through a separating machine, and the regenerated slag can be recycled. The zinc electrolyte dechlorination method has the advantages of being low in cost, high in efficiency, free of waste water, free of waste slag and free of waste gas.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for removing chlorine in a zinc electrolyte. Background technique [0002] Zinc hydrometallurgy is the process of leaching solid zinc-containing materials with sulfuric acid, and obtaining a qualified electrolyte that can meet the requirements of electrolysis through various stages of purification. That is to say, the zinc electrolyte is the necessary process from the scattered low-zinc material to the zinc-containing liquid and then to the metal zinc in the hydrometallurgy—playing the role of a bridge between the two. [0003] With the increasingly serious environmental protection situation, various non-environmentally friendly manufacturers of low-zinc bulk materials have been ordered to stop production, and the low-zinc low-density materials are gradually decreasing. higher. The zinc electrolyte element impurity produced before treatment will also be mor...

AI Technical Summary

Problems solved by technology

[0005] The current dechlorination methods include: ①wet method-alkali washing, ion exchange column resin adsorption ②fire method-multi-hearth furnace, rotary kiln, etc., all of which cannot meet the environmental protection requirements. ①The water volume is too large and the slag volume is too much; ②The cost is too high high

Images