Method for recovering lithium in lithium-containing battery waste materials

Abstract

The invention provides a method for recovering lithium in lithium-containing battery waste materials. The method comprises the following steps of (1) mixing the lithium-containing battery waste materials with a salt water solution to obtain raw material slurry; performing electrochemical treatment on the raw material slurry; performing solid-liquid separation; obtaining liquid of lithium-containing purified liquid; (2) regulating the pH of the lithium-containing purified liquid in the step (1) to be 7 or higher; adding carbonates for lithium precipitation reaction; performing solid-liquid separation after the reaction; obtaining solid of lithium carbonate. The method provided by the invention has the advantages that the flow process is short; the operation is simple; the reaction process is green and clean; no waste is discharged in the integral flow process; the soaking- precipitation-separation process of a conventional process is realized through one step of the electrochemical processing; the production cost is reduced; the lithium recovery selectivity is as high as 99 percent; the single time recovery rate reaches 95 percent or higher; the obtained product purity reaches the battery grade lithium carbonate requirements; meanwhile, the high-value conversion of other metal ingredients is realized.

Description

technical field [0001] The invention belongs to the technical field of recycling lithium resources in waste lithium ion batteries, and relates to a method for recycling lithium in lithium-containing battery waste. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products such as mobile phones, notebook computers, digital cameras, electric vehicles, and energy storage due to their advantages such as high energy, light weight, long cycle life, and no memory effect. In 2011 alone, the production of lithium-ion batteries in my country was as high as 2.9 billion. Accompanied by it, the generation of a large number of waste lithium-ion batteries has posed a severe challenge to the electronic waste disposal and environmental protection in my country and the world. On the one hand, waste lithium-ion batteries contain toxic and flammable electrolytes, heavy metals and other harmful components. Lithium, cobalt, nickel, manganese, copper, aluminum and ...

AI Technical Summary

Problems solved by technology

This method realizes the selective recovery of lithium in lithium iron phosphate. However, after the oxidative leaching of sodium persulfate, the obtained lithium-rich solution also contains other impurity metal ions, which need to be removed by adding alkali, and the above method is not very good. It inhibits the leaching behavior of nickel, aluminum, and copper, so it cannot be used in the selective lithium extraction process of lithium nickelate, lithium nickel-cobalt manganese oxide, lithium nickel-cobalt aluminate, and electrode materials containing aluminum foil, copper foil, etc.

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