A method for recycling waste saggers in the preparation process of lithium cobalt oxide battery materials

Abstract

The invention provides a method for carrying out recovery treatment on a waste saggar in a lithium cobaltate battery material preparation process, wherein the waste saggar contains silicon, aluminum and magnesium impurities. The method comprises: 1) mixing a waste saggar, an acid solution and an additive, carrying out a leaching reaction, and separating to obtain a purified saggar and a leachate;2) adjusting the pH value of the leachate to 2-5, and separating to obtain solid residue and a separated liquid; 3) adding an aluminum removing agent to the separated liquid, crystallizing, and separating to obtain solid residue and an aluminum removed liquid; 4) adjusting the pH value of the aluminum removed liquid to more than or equal to 8.5, and separating to obtain a cobalt-containing substance and a cobalt precipitation liquid; 5) adding a magnesium removing agent to the cobalt precipitation liquid, adjusting the pH value to more than or equal to 11, and separating to obtain solid residue and a magnesium removed liquid; and 6) adding a precipitating agent to the magnesium removed liquid, carrying out a reaction, and separating to obtain a lithium-containing substance and a lithium precipitation liquid. According to the present invention, with the method, the recovery and utilization of cobalt and lithium in the waste saggar is achieved, the waste saggar is purified, and the method is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for recycling and processing solid wastes in the new energy industry, in particular to a method for recycling and processing waste saggers during the preparation of positive electrode materials for lithium cobalt oxide batteries. Background technique [0002] In recent years, with the strong support of national policies and the rapid advancement of the current energy and information industries, the new energy industry represented by electric vehicles has developed rapidly, and the lithium battery industry has developed rapidly, which will greatly drive the upstream and downstream industries. of rapid development. [0003] As an important battery cathode material, lithium cobalt oxide cathode material is widely used in the field of new energy, and due to the upgrade of cathode material research and development. In the firing process of the lithium cobalt oxide powder, a mullite cordierite saggar is usually used as a co...

AI Technical Summary

Problems solved by technology

CN101284723A discloses "a method for preparing the seventh empty clay brick by using waste sagger material", which is to water-fill and clean the waste sagger in the firing process of ceramsite proppant, and then further crush and classify the coarse and fine materials as a raw material Adding it to the firing process of low-porosity clay bricks can realize the utilization of waste saggers, reduce environmental pollution and save natural resources. However, the waste saggers of lithium cobaltate cathode materials are difficult to return directly because they still contain alkali metals.

However, due to the alkali metal reaction on the surface of the waste saggers in the production process of lithium cobaltate cathode materials, it is difficult to directly return them to use. At present, there are no relevant literature reports on the comprehensive utilization of waste saggers in the new energy industry.

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