Method for recycling nickel-cobalt-manganese-lithium from waste power lithium ion battery black powder

Abstract

The invention discloses a method for recycling nickel-cobalt-manganese-lithium from waste power lithium ion battery black powder. The method comprises the steps of conducting leaching and filtering through a sulfuric acid and sulfur dioxide system, adding lime milk into filtrate, adjusting the pH to 10-12, controlling precipitation, and conducting filtering to obtain a nickel-cobalt-manganese enriched product and lithium-containing filtrate; conducting purifying and impurity removal on the lithium-containing filtrate, adding a sodium carbonate solution for precipitation of lithium to obtain lithium carbonate; leaching the nickel-cobalt-manganese enriched product through sulfuric acid, adjusting the pH to 4-6, removing impurity iron and aluminum, and conducting solid-liquid separation to obtain purified slag and purified liquid; and adjusting the pH of the purified liquid to 4-5, conducting manganese extraction with P204 as an extraction agent, conducting cobalt extraction with P507 asan extraction agent, and conducting nickel extraction with P507 as an extraction agent. Through the method provided by the invention, the lithium recovery rate is greatly increased; moreover, sodium hydroxide generated from precipitation of lithium can be returned and continuously used in the lime milk nickel-cobalt-manganese enrichment process; and meanwhile, the yield of nickel sulfate, cobalt sulfate and manganese carbonate is increased.

Description

technical field [0001] The invention belongs to the technical field of recycling waste lithium-ion power batteries, and in particular relates to a method for recovering nickel-cobalt-manganese-lithium from waste power lithium-ion battery black powder. Background technique [0002] With the explosive growth of the use of new energy vehicles, waste power lithium-ion batteries will be one of the main solid wastes in my country's cities in the future, but they will also be typical "urban minerals". Lithium-ion batteries contain a large amount of valuable metals. For example, the average content of lithium, nickel, and cobalt in the nickel-cobalt lithium manganate ternary positive electrode material is 1.9%, 12.1%, and 2.3%; It reached 13.3% and 12.7%. The content of these metals is even much higher than that in the ore, which is of great recycling value. At the same time, the recycling of waste power batteries also reduces the pressure of environmental pollution, which has dua...

AI Technical Summary

Problems solved by technology

However, when elements such as nickel, cobalt, and manganese are recovered at the front end, some lithium elements will be entrained and lost, so the final lithium recovery rate is low, only about 60%.

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