A method for efficiently separating and recovering zinc and cobalt from purified cobalt slag

Abstract

The invention belongs to the technical field of hydrometallurgy comprehensive recycling and relates to a method of efficiently isolating and recycling zinc and cobalt from purified cobalt slag. The method herein comprises: 1) leaching out purified cobalt slag via sulfuric acid to obtain leached slag; 2) using an alkaline solution to neutralize leachate; 3) using sulfuric acid to neutralize zincatesolution to obtain sulfate solution and zinc hydroxide; calcining the cobalt slag under nitrogen protection to obtain finished high-purity cobalt oxide. Efficient separation of zinc and cobalt is achieved by making use of only the alkali solution PH difference of zinc hydroxide and cobalt hydroxide; the zincate solution and cobalt hydroxide slag attained from an alkali precipitation process are treated further respectively to recycle zinc and cobalt, operations are simple, the recycling efficiency is high; the sulfate solution attained herein can be returned to the alkali precipitating procedure, the material consumption and production cost are reduced, and the whole process has no emission of wastewater and waste gas, enables valuable metals to be comprehensively recycled and meets the requirement on clean production.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy comprehensive recovery, in particular to a method for efficiently separating and recovering zinc and cobalt from purified cobalt slag. Background technique [0002] Cobalt is a strategic metal resource that supports the development of high-tech fields. With the popularity of electronic products and the promotion of new energy vehicles, China has become the third largest consumer of cobalt after the United States and Japan. However, my country's reserves only account for 1.1% of the world's total reserves, and its dependence on foreign countries exceeds 90%. Moreover, my country's cobalt ore resources are mainly associated with zinc, copper, and nickel sulfide ores, with an average grade of 0.03-0.2%. Due to the low grade of cobalt resources in my country and the majority of associated ores, deep smelting of cobalt-containing minerals to directly extract cobalt is not only difficult and co...

AI Technical Summary

Problems solved by technology

At present, zinc powder replacement method and organic precipitation method are mostly used in the purification of leaching liquid in zinc hydrometallurgy production. Zinc powder replacement method requires a large amount of zinc powder, which will produce a large amount of purification slag. The purification slag not only contains a large amount of unreacted zinc powder, but also It also contains high-grade cobalt, which has extremely high economic value, but due to the low efficiency of zinc replacement, the content of zinc in cobalt slag is much higher than that of cobalt, and further purification is required to achieve efficient extraction of cobalt

The zinc in the slag is usually recovered by sulfuric acid leaching, and the leached slag also contains rich metal resources such as copper, cobalt, and cadmium, and is usually disposed of in the form of stockpiling or selling as intermediate slag; it is purified by organic compounds When removing cobalt, the cost is high, and the reagents are difficult to recycle and regenerate; in addition, the purified cobalt slag formed by this method is also difficult to comprehensively recycle the metal resources in it.

[0004] In view of the current situation that there are few metal resource processes for the comprehensive recovery and purification of cobalt slag, this patent discloses a process for treating the cobalt slag purified by the zinc powder replacement method, which can effectively realize the separation of zinc and cobalt and the efficient separation of zinc and cobalt step recovery

Images