A method for comprehensive recovery of valuable metals in waste lithium-ion battery black powder

Abstract

A method for comprehensively recovering valuable metals in waste lithium ion battery black powder: the waste lithium ion battery black powder is subjected to high temperature reduction in an inert atmosphere, and then hydrogen chloride gas is introduced for selective hydrochlorination to obtain solid products and volatilization. The volatile chloride salt fume and dust are subjected to water leaching to obtain filtrate and solid residue, and the solid product is subjected to water leaching and solid-liquid separation to obtain water leaching liquid and water leaching residue; the water leaching residue is subjected to magnetic separation to obtain Magnetic nickel-cobalt alloy and non-magnetic mixture, the non-magnetic mixture is leached with NaOH solution to obtain aluminum leaching solution and high-purity regenerated graphite; the filtrate and water leaching solution are combined, the pH is adjusted to 9-12, and the solid-liquid separation is performed to obtain manganese hydroxide solid and Lithium ion-containing filtrate, adding saturated Na to the lithium ion-containing filtrate 2 CO 3 solution, solid-liquid separation, and hot water washing of the filter residue to obtain high-purity Li 2 CO 3 . The whole recovery process of the invention is simple, the loss of valuable metals is small, and the recovery efficiency is high.

Description

technical field [0001] The invention relates to a method for recycling waste and used lithium ion batteries, in particular to a method for comprehensively recycling valuable metals in black powder of waste and used lithium ion batteries. Background technique [0002] With unparalleled high energy density and excellent cycle stability, lithium-ion batteries have become the energy storage device of choice for portable electronic devices and powertrains. According to statistics from the China Light Industry Information Center (CNLIC), the output of lithium-ion batteries in 2019 was 15.722 billion, and the output is still increasing year by year. And lithium-ion batteries have a shorter lifespan, which has led to a growing production of used lithium-ion batteries. According to statistics, in 2020, the global output of used lithium-ion batteries will reach 25 billion, with a total weight of 500,000 tons. Waste lithium-ion batteries are also valuable secondary resources, contain...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to overcome the problems that the lithium element cannot be effectively recovered in the existing pyrotechnics, the recovery time of the wet technique is long, and the consumption of chemical reagents is large, and to provide a comprehensive recovery of valuable metals in the black powder of waste lithium-ion batteries The method, through the ingenious coupling of hydrochlorination and carbothermal reduction reactions, can quickly and efficiently separate lithium, manganese, nickel, and cobalt elements in the fire stage, and does not use any acidic reagents in the wet leaching stage. There are no more than 2 kinds of metal ions in the immersion solution at the same time, and lithium, manganese, nickel, cobalt, and graphite can all be recovered in the separation stage without using any organic and acidic solutions, and it has high recovery rate, low reagent consumption, and high energy efficiency. Low consumption and other advantages

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