A non-saponification method for extraction separation of nickel and cobalt

Abstract

A non-saponification method for extraction separation of nickel and cobalt is provided. The method includes subjecting nickel- and cobalt-containing solid waste to high-temperature calcination, performing acid leaching to form an acid leachate, mixing synergistic extractants and a diluting agent, reacting the mixture with the acid leachate, and extracting the cobalt in the acid leachate to achievenickel-cobalt separation. No NaOH adopted as a saponifier is used in the method, thus avoiding excessive emission of saponification waste water. An acidic extractant B326 and an alkaline extractant methyl chloride N204 are synergistic under acidic conditions and the cobalt in the acid leachate is extracted into an organic phase effectively, thus achieving nickel-cobalt separation. For power battery solid waste the discharging amount of which is huge because power batteries are widely applied, the method is simple to operate and low in equipment requirements and has huge industrial practicality.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a method for separating solid waste containing nickel and cobalt. Background technique [0002] With the rapid development of the automobile industry, problems such as environmental pollution, energy depletion, and resource shortage caused by traditional automobiles have become increasingly severe, and the proportion of new energy vehicles in my country's automobile industry has gradually increased. As a major part of the new energy vehicle industry chain, the performance of power batteries has also been improved. At present, the research on power batteries of new energy vehicles in my country mainly focuses on the improvement of safety performance and service life, but there is a serious disconnect in the recycling of power batteries. For example, lithium-ion batteries as power batteries do not contain heavy metal elements such as mercury, cadmium, and...

AI Technical Summary

Problems solved by technology

Patent CN1824814 proposes a mixed extractant that uses one or 2-3 kinds of acidic organic acids or organic acid ester extractants to extract and separate rare earth elements in rare earth chloride or rare earth nitrate solutions. When extracting and separating rare earths, the organic extractant does not need saponification, and no waste water is generated during the extraction process, which can eliminate the pollution of ammonia nitrogen wastewater to water resources. Although this method uses a composite extractant instead of saponification, the extractant is weakly acidic Organic phosphoric acid, this method improves the ability to extract and separate rare earths through the synergistic effect of the compound extractant, but it will lead to an increase in the acidity of the solution