Demagnetizing process for preparing battery-grade manganous-manganic oxide by manganese sheet method

Abstract

The invention relates to a systematic demagnetizing process for preparing battery-grade manganous-manganic oxide by a manganese sheet method, and the process comprises the following steps: weighing 3kg of manganese sheets, crushing the manganese sheets to 20 meshes by using a double-roller machine, sieving the manganese sheets, adding the manganese sheets into a pickaxe ball mill, adding 3L of pure water, and performing grinding for 30 minutes. According to the demagnetizing process for preparing the battery-grade manganous-manganic oxide by the manganese sheet method, manganese powder is crushed to a certain required mesh number under a nitrogen protection atmosphere and demagnetized, or manganese sheets enter a pickaxe ball mill to be finely ground by adding water after being crushed by a pair of rollers, and then the demagnetizing requirements of required raw materials are met through slurry demagnetizing; magnetism-removed manganese powder or manganese slurry is added into a synthesis kettle, the synthesis kettle is prepared from a PPH material, magnetic anisotropy is prevented from being brought into the synthesis kettle, a pipeline magnetism remover is installed at an outlet of the synthesis kettle, magnetic anisotropy brought into a stirrer is eliminated to a certain degree before being brought into a terminal, a product can be brought into a certain amount of magnetic anisotropy after being subjected to pressure washing and drying, and terminal magnetism removal adopts an electromagnetic magnetism remover with a knocking hammer. And the material loss is further reduced while it is ensured that the magnetic anisotropy reaches the standard of 200 ppb.

Description

technical field [0001] The invention relates to the technical field of demagnetization technology, in particular to a demagnetization technology for preparing battery-grade trimanganese tetroxide by a manganese flake method. Background technique [0002] Lithium manganese oxide is one of the cathode materials for lithium batteries. The main raw materials are EMD and battery-grade manganese tetraoxide. Compared with the battery-grade manganese tetraoxide, the impurity content is lower, combined with the characteristics of high tap density and spinel structure, the prepared Lithium manganate has better high-temperature cycle performance, and is more used in the preparation of high-end lithium manganate. [0003] At present, there are two main production processes for the production of battery-grade manganese tetroxide in the industry: solution method and manganese flake method. Electrolytic manganese flakes are used as raw materials, and the process flow is short. When the pr...

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a demagnetization process for preparing battery-grade trimanganese tetroxide by the manganese flake method, which has the advantages of low production cost and solves the problem of high production cost and high environmental pressure. The manganese flake method uses electrolytic manganese Chips are used as raw materials, and the process is short. When the manganese price is low, the production cost advantage is obvious, but there are difficulties such as difficult demagnetization in the production process.

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