Method for recycling lithium, nickel, cobalt and manganese from waste ternary anode material

Abstract

The invention discloses a method for recycling lithium, nickel, cobalt and manganese from a waste ternary anode material. The method comprises the steps of with the waste ternary anode material as theraw material, adding a carbon reducing agent, carrying out mixing and dosing, carrying out roasting reduction at 500-700 DEG C in a protective atmosphere, adding the roasted product into water, carrying out water-soluble reaction, after the reaction is finished, filtering to obtain lithium carbonate filtrate and a filter residue I, carrying out sulfuric acid leaching on the filter residue I so asto obtain a filtrate containing nickel, cobalt and manganese and a filter residue II, adding sulfate so as to adjust the proportion of nickel, cobalt to manganese in the filtrate containing nickel, cobalt and manganese, carrying out precipitation reaction on the filtrate containing nickel, cobalt and manganese, a sodium hydroxide solution and an ammonia water solution in the protective atmosphere, controlling the reaction temperature at 50-70 DEG C and the pH value at 10-11, obtaining ternary precursor slurry after the precipitation reaction, filtering, washing, and drying, so as to obtain the ternary precursor. The method has the beneficial effects that the separation condition of lithium carbonate is simple, the costs of leaching processes of nickel, cobalt and manganese and the regeneration process of the ternary material precursor are low, and the recycling rate is high.

Description

technical field [0001] The invention belongs to the field of solid waste recovery, and relates to a method for recovering lithium, nickel, cobalt and manganese in the positive electrode material of a waste ternary lithium ion battery. Background technique [0002] Lithium-ion batteries are favored by the market and consumers for their high energy density, long cycle life, and environmental friendliness. Currently, the cheap and safe ternary material LiNi x co y mn z o 2 It is a commercial cathode material widely used in the market. It is mainly used in portable electronic devices such as laptops and cameras and electric vehicles. Since the promotion of new energy vehicles in 2009, its number has exploded. In 2016, the production of new energy vehicles in my country More than 507,000 vehicles, and the service life of power batteries is generally 3 years, so a large number of lithium-ion batteries will be scrapped this year and next. It is estimated that by 2020, the scrapp...

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Problems solved by technology

[0007] The above-mentioned patent improves the leaching efficiency by adding hydrogen peroxide as a reducing agent, and then separates lithium-nickel-cobalt-manganese through chemical precipitation and solvent extraction; the process is complicated, the cost of the reducing agent is high, and the subsequent separation and purification procedures are various and complicated. At the same time, the solution after separation and purification contains Low concentration of valence metals will generate a lot of waste water

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