Method and system for recycling waste ternary battery positive electrode material based on hydrochloric acid regeneration cycle

Abstract

The invention relates to a method and a system for recycling a waste ternary battery positive electrode material based on hydrochloric acid regeneration cycle. The method comprises the following steps: activating and screening the waste ternary battery positive electrode material to obtain ternary material powder, performing acid leaching with hydrochloric acid, decoppering and desiliconizing to obtain a solution containing nickel chloride, cobalt chloride, manganese chloride and lithium chloride, supplementing a part of ternary chloride to enable the content of the substances in the solutionto meet the requirements of a ternary precursor material, carrying out thermal decomposition to obtain a mixed oxide of nickel oxide, cobalt oxide and manganese oxide and HCl, absorbing the HCl to obtain hydrochloric acid for recycling, carrying out water leaching on the mixed oxide to obtain an oxide filter cake and a lithium chloride solution, and calcining the oxide filter cake to obtain a ternary precursor oxide. According to the method, the characteristic that nickel chloride, cobalt chloride and manganese chloride are easy to pyrolyze is utilized, separation of nickel, cobalt, manganeseand lithium is achieved, meanwhile, cyclic utilization of hydrochloric acid is achieved, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the field of waste lithium battery recycling, and relates to a recycling method and system for a waste ternary battery cathode material based on a hydrochloric acid regeneration cycle. Background technique [0002] Lithium-ion batteries have high working voltage and energy density, stable discharge voltage, no memory effect, light weight and small size, and are widely used in mobile electronic devices, electric vehicles, power reserve and other fields. Lithium battery cathode materials mainly include lithium cobalt oxide, lithium iron phosphate and ternary composite materials. Among them, ternary batteries have the advantages of high energy density, high voltage, good cycle performance, and safe operation, and are especially suitable for new energy vehicles. Wide application has vigorously promoted the development of new energy vehicles. With the vigorous development of new energy vehicles, on the one hand, the amount of lithi...

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Problems solved by technology

If the input sulfate, chloride, sodium, nitrate and other ions cannot enter the product, they will generally enter the waste water or solid waste, resulting in a large amount of saline waste water and solid waste. If you are not careful, it will easily cause secondary damage to the environment. Pollution

[0004] CN106319228A discloses a method for synchronously recovering nickel, cobalt and manganese from the sulfuric acid leaching solution containing nickel, cobalt and manganese waste residue, said method comprising (1) sulfuric acid leaching; (2) removing iron and aluminum; (3) extracting copper; (4) Extracting zinc; (5) synchronously extracting nickel, cobalt and manganese, and then washing the organic phase containing nickel, cobalt and manganese with dilute sulfuric acid to remove the entrained calcium and magnesium impurities, and then performing countercurrent back extraction with sulfuric acid to obtain nickel, cobalt and manganese Sulfate, the method described in this scheme has a long process flow, and produces more waste liquid, which has environmental hazards

[0005] CN108539309A discloses a recovery method of waste nickel-cobalt-lithium-manganese-oxide positive electrode material. The method disassembles the waste nickel-cobalt-lithium manganese oxide battery, crushes the positive electrode piece, and puts the crushed material into a reduction furnace for hydrogen reduction after sieving; The obtained reducing material is washed with hot pure water to obtain the washing liquid and the washing residue, and the washing liquid is fed into carbon dioxide to obtain lithium bicarbonate solution and aluminum hydroxide precipitation, and the aluminum hydroxide is calcined to obtain superfine alumina, and the obtained lithium bicarbonate Battery-grade lithium carbonate is obtained through pyrolysis; the washing residue is added to hydrazine hydrate solution, and then sodium hydroxide is added to stir and filter to obtain the second filtrate and the second filter residue, and the second filter residue is placed in a vacuum drying oven for vacuum drying. The materials are sieved and magnetically separated to obtain nickel-cobalt-manganese ternary alloy powder or directly add acid to dissolve to obtain nickel-cobalt-manganese ternary mixed solution. This scheme will generate more waste liquid during the operation process, and there are environmental hazards

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