A method for comprehensive utilization of mother liquor in the synthesis process of lithium-ion battery ternary cathode material precursor

Abstract

A method for comprehensive utilization of a mother liquor in a synthesis process of a ternary positive electrode material precursor of a lithium ion battery, comprising steps of: introducing, from top to bottom, a ternary precursor mother liquor into a rectification tower of a stripper deamination system to perform deamination, deamination residence time of a unit volume of the mother liquor being controlled to be 0.5-1.0 h; after the deamination of step one, adding a specific amount of ternary precursor waste, and introducing ozone at a specific rate, to carry out a reaction for 0.5-2 hours while heating and stirring; filtering the ternary precursor liquor obtained after completion of the reaction in step two to obtain a filtrate and a filter residue; and putting the filter residue obtained in step three into another reaction tank, adding water and mixing to obtain a slurry, adding a specific amount of sulfuric acid and a reducing agent, and leaching by heating and agitation for 2-6 hours. The method for comprehensive utilization of a mother liquor in a synthesis process of a ternary positive electrode material precursor of a lithium ion battery produces precipitates that are easy to filter and easy to return to use, removes nickel, cobalt, and manganese and ammonium ions more thoroughly, thus laying a foundation for subsequent production of high purity sodium sulfate, reducing production time costs and raw material costs, and achieving closed resource cycles in wastewater.

Description

technical field [0001] The invention relates to a method for comprehensive utilization in the preparation process of lithium ion battery positive electrode materials, in particular to a method for comprehensive utilization of mother liquor in the synthesis process of lithium battery ternary positive electrode material precursors. Background technique [0002] In recent years, power lithium batteries with ternary materials as cathode materials have gradually occupied an increasingly important position in the power battery industry due to their important advantages such as high capacity, high energy density, good cycle stability, and moderate cost. At present, the industrial ternary cathode materials are generally made of the hydroxides of Ni, Co, and Mn as precursors and calcined with lithium. The mainstream process for the generation of ternary material precursors is the co-precipitation method. By configuring a solution of mixed metal ions with a certain concentration, NaOH...

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Problems solved by technology

[0005] In order to solve the existing problems, the present invention provides a method for the comprehensive utilization of mother liquor in the synthesis process of the precursor of the lithium battery ternary positive electrode material. The method is simple in process, easy to control, low in pollution, capable of continuous production, and achieves resource recycling. effect, to solve the problems raised in the above-mentioned background technology

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