Process for preparing battery-grade cobaltosic oxide by treating cobalt matte at normal pressure
A technology of cobalt tetroxide and atmospheric pressure treatment, which is applied in the direction of cobalt oxide/cobalt hydroxide, battery electrodes, circuits, etc., which can solve the problems of low tap density and small particle diameter, so as to avoid uneven dispersion, improve dispersion performance, and improve The effect of uniformity
Pending Publication Date: 2022-07-15
珠海市科立鑫金属材料有限公司
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[0003] The purpose of the present invention is to provide a process for preparing battery-grade cobalt tetroxide by treating cobalt matte under normal pressure, so as to solve the problems of low tap density and small particle diameter of cobalt tetroxide prepared in the prior art
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[0030] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0031] A process for preparing battery-grade cobalt tetroxide by treating cobalt matte at normal pressure, comprising the following steps:
[0032] S1, after the cobalt matte is crushed to 200-250 mesh, to wherein add sulfuric acid and sodium chlorate, solid-liquid separation after the reaction, obtains the filter residue rich in iron and the filtrate rich in copper and cobalt;
[0033] Since the cobalt matte raw materials mainly cont...
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The invention discloses a process for preparing battery-grade cobaltosic oxide by treating cobalt matte under normal pressure, reactant crystals of a cobalt-rich solution and an ammonium bicarbonate solution are used as seed crystals of a next reaction, and the particle size of a finally obtained cobalt carbonate crystal can be effectively increased through repeated operation; therefore, the particle diameter of the cobaltosic oxide prepared subsequently is increased, and the application value of the cobaltosic oxide in the battery industry is increased; according to the invention, polyvinylpyrrolidone is added into the crystal slurry obtained by reaction as a dispersing agent, so that the dispersing performance of the crystal is effectively improved. Therefore, the particle size distribution uniformity of crystals obtained through subsequent crystallization is improved, and the application value of the finally obtained cobaltosic oxide in lithium battery production is improved.
Description
technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a process for preparing battery-grade cobalt tetroxide by treating cobalt matte at normal pressure. Background technique [0002] Cobalt matte is rich in cobalt, iron, copper and other components. Therefore, when cobalt matte is subjected to atmospheric pressure treatment to extract each main component, each component needs to be extracted step by step, and finally cobalt with higher purity can be obtained. In the technology, ammonium carbonate is generally generated by reaction, and then ammonium carbonate is roasted at high temperature to generate cobalt tetroxide. However, the cobalt tetroxide prepared by this method has the problems of low tap density and small particle diameter, and it is difficult to prepare large particles in battery production and application. Lithium cobalt oxide causes the electrochemical performance of lithium batteries to fail to...
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Login to View More IPC IPC(8): C01G51/04H01M4/52
CPCC01G51/04H01M4/52
Inventor 郑良明
Owner 珠海市科立鑫金属材料有限公司