Zinc hydrometallurgy novel efficient purification process

Abstract

The invention relates to a zinc hydrometallurgy novel efficient purification process and belongs to the technical field of zinc hydrometallurgy zinc liquid purification production. The zinc hydrometallurgy novel efficient purification process comprises the steps that a main system adopts a zinc powder replacement method (three stages of purification) for removing copper, cadmium, cobalt and other impurity ions in zinc liquid, and an auxiliary system adopts a zinc powder+chemical agent method (four stages of purification) for conducting purification, separation and refinement on the copper, cadmium and cobalt slag. The zinc hydrometallurgy novel efficient purification process has the advantages that (1) the main system adopts the zinc powder replacement process, the purification decontamination ability is high, no impurity is brought into the main system, and plate burning and other risks are avoided; (2) the auxiliary system adopts the zinc powder+chemical agent method for conducting separation and purification on the copper and cadmium slag lixivium, cobalt removing efficiency is high, reaction time is short, comprehensive energy consumption is low, and the separation effect is good; and (3) a barren cadmium solution produced by the auxiliary system can return to the leaching procedure of the main system, the recovery rate of zinc is increased, cadmium ingots, copper slag and cobalt slag which are produced can be sold, cost is lowered, and benefits are increased.

Description

technical field [0001] The invention relates to the technical field of purification and production of zinc liquid in hydrometallurgy, in particular to a novel high-efficiency purification process for zinc hydrometallurgy. Background technique [0002] In the zinc hydrometallurgy process, cobalt is one of the most important impurity ions that harm zinc electrowinning, and the problem of cobalt removal has been plagued by zinc hydrometallurgy enterprises. Incomplete removal of cobalt ions in the zinc solution will cause burning of the electrolytic deposition board during the electrowinning process, which will bring huge losses to the enterprise. Therefore, the cobalt impurity ions must be removed to a lower concentration before zinc electrowinning. The methods for purifying and removing cobalt mainly include zinc powder replacement method and organic reagent method. The zinc powder replacement method for cobalt removal will not introduce impurity ions and organic substances ...

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Problems solved by technology

[0005] The present invention is aimed at the complex components of the zinc solution in the purification system of the hydrometallurgy, the difficulty in purifying and separating impurity ions such as copper, cadmium and cobalt in the main and auxiliary systems, and the complicated purification process, and the incomplete removal of impurities in the zinc solution in the main system will cause electrolytic burning. To solve the problems of low recycling rate of valuable metals in the secondary system, provide a new type of high-efficiency purification process for zinc hydrometallurgy

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