A method for producing ternary precursor and high-purity lithium carbonate from a waste ternary lithium battery

Abstract

The invention discloses a method for producing a ternary precursor and high-purity lithium carbonate from a waste ternary lithium battery, which comprises eight steps of preparing cathode powder, reducing cycle leaching, filtering and washing, etc. The purpose of the invention is to provide a method for producing ternary precursor and high-purity lithium carbonate from waste ternary lithium battery, which is environmentally friendly, low in energy consumption, low in production cost, low in pollutant discharge amount, highly effective in realizing comprehensive utilization of resources and satisfying industrial production.

Description

technical field [0001] The invention relates to the technical field of rare metal metallurgy and the technical field of secondary resource recycling, in particular to a method for producing a ternary precursor and high-purity lithium carbonate from waste ternary lithium batteries. Background technique [0002] Nickel, cobalt, and manganese ternary lithium batteries have many excellent electrochemical properties, such as high energy density, high voltage, long life, wide temperature range and small memory effect, plus no lead, mercury, cadmium, etc. Due to the advantages of toxic heavy metal elements and light weight, it is widely used in portable electronic devices such as cameras, notebook computers, and mobile phones. Most importantly, the vast majority of electric vehicles and hybrid vehicles use nickel-cobalt-manganese ternary lithium batteries as their power source. According to the forecast of the China Automotive Technology and Research Center, by 2020, the cumulativ...

AI Technical Summary

Problems solved by technology

This process adopts high-temperature reduction roasting, and the waste ternary lithium battery is mixed with fluorine-containing oily binder PVDF, plastic diaphragm, carbonate solvent and other substances. When roasting at high temperature, these substances will produce fluoride and carcinogenic dioxins. British gas, chlorine gas or sulfur dioxide gas will be produced during reduction roasting, which will seriously pollute the environment and have adverse effects on the human body

The national environmental protection monitors this very strictly. If the waste ternary battery positive electrode powder is to be reduced and roasted at high temperature to burn off the organic matter and turn the valuable metal into soluble salt into the solution, it is difficult to pass the environmental protection. Because the waste ternary battery The mesh number of the positive electrode powder of the battery has reached above -400 mesh, the dust is very large during roasting, the operating environment is harsh, and the ternary waste is greatly lost during the roasting process. This patent does not involve how to remove impurities calcium, magnesium and zinc. The carbon used in this patent The method of preparing ternary materials from acid salts, because carbon dioxide gas will be generated during carbonate calcination, will lead to loose product structure, low tap density, and poor product quality. This is why the carbonate calcination method is used to produce ternary materials. The reason why it was replaced by the process of synthesizing nickel, cobalt, manganese hydroxide and calcination of lithium source

In the patent document with the publication number CN105789726A, the precipitated nickel-cobalt-manganese-lithium carbonate is also calcined to prepare the ternary material, which also has the disadvantage of poor product quality

[0006] In the production practice of comprehensive utilization of waste nickel-cobalt-manganese ternary lithium batteries, the unit product investment is large, the process is complicated, the extraction operation is difficult, the extraction solvent has a large safety hazard, and the environment is polluted. Manganese, lithium Can not be recycled with high added value, high production cost, poor efficiency and other problems

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