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Preparation method of low-cost battery-grade manganous-manganic oxide

A technology of manganese tetroxide and battery grade, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of high raw material cost of manganese tetroxide and large amount of waste water treatment, so as to reduce the solid liquid content and improve alkali recovery. rate, and the effect of ensuring safety

Inactive Publication Date: 2021-10-08
贵州金瑞新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a low-cost battery-grade manganese tetraoxide preparation method, which has the advantages of low cost and strong environmental protection, and solves the problem of producing battery-grade manganese tetraoxide raw materials from the existing manganese sulfate solution. Problems of high cost and large volume of wastewater treatment

Method used

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  • Preparation method of low-cost battery-grade manganous-manganic oxide

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: a kind of low-cost battery grade trimanganese tetraoxide preparation method, comprises the following steps:

[0032] 1) Take 14.2L of purified 100g / L manganese sulfate solution, add a certain amount of complexing agent, stir well and set aside, mark it as agent A, take 4L of 32% liquid caustic soda, mark it as agent B, and set aside;

[0033] 2) Add a certain amount of bottom liquid to the 30L synthesis tank, heat it to a certain temperature, and under the action of stirring, pump A and B agents into the synthesis tank at the same time through a peristaltic pump. During the process, a certain amount of air is introduced and controlled. pH value;

[0034] 3) After the synthesis is completed, the reaction mixture is subjected to solid-liquid separation, and the solid slag is washed and dried, marked as sample C, and the relevant indicators are detected;

[0035] 4) Take 10L of the filtrate separated in step 3, add 600g quicklime (excess lime), stir for a ce...

Embodiment 2

[0039] Embodiment 2: A method for preparing low-cost battery-grade trimanganese tetraoxide, comprising the following steps:

[0040] 1) Take 14.2L of purified 100g / L manganese sulfate solution, add a certain amount of complexing agent, stir well and set aside, mark it as agent A, take 8L of 50% ammonia, mark it as agent B, and set aside;

[0041] 2) Add a certain amount of base liquid to a 30L fully-sealed synthesis tank, heat it to a certain temperature, and under the action of stirring, pump A and B agents into the synthesis tank at the same time through a peristaltic pump, and a certain amount of air is introduced during the process. And control the pH value;

[0042] 3) After the synthesis is completed, the reaction mixture is subjected to solid-liquid separation, and the solid slag is washed and dried, marked as sample A, and the relevant indicators are detected;

[0043] 4) Take 10L of the filtrate separated in step 3, add 600g of quicklime (excess lime), and stir in a ...

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Abstract

The invention relates to a preparation method of low-cost battery-grade manganous-manganic oxide. According to the preparation method of the low-cost battery-grade manganous-manganic oxide, low-cost key lime and other low-cost alkali are used for replacing liquid caustic soda, liquid ammonia and other expensive alkali; when the battery-grade manganous-manganic oxide is being prepared, the alkali and a manganese source are main raw materials and account for 70% or above of the cost; as the low-cost lime is used as the alkali, the calcium content of a system is inevitably high, so lime is added into a system of a filtrate obtained by using a liquid caustic soda or ammonia water system and containing sodium sulfate and ammonium sulfate, hydroxyl ions in the lime are carried into the system through a precipitation process of sulfate radicals and calcium, and a small amount of calcium in liquid caustic soda and ammonia water or a mixture of the liquid caustic soda and the ammonia water are removed by using sodium carbonate; and filtrate water can be fully recycled in the process of producing drowned lime by using quick lime and water, so the production cost of preparing the battery-grade manganous-manganic oxide from manganese sulfate can be greatly reduced, and the problems of high raw material cost and large wastewater treatment capacity in the existing process of producing the battery-grade manganous-manganic oxide from a manganese sulfate solution are solved.

Description

technical field [0001] The invention relates to the technical field of battery-grade manganese tetraoxide production, in particular to a low-cost battery-grade manganese tetraoxide preparation 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 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 dynamic 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. The cost of the solution method is mainly concentrated on the two main raw materials of manganese salt and alkali, while the cost...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
CPCC01G45/02
Inventor 罗文宗李小军康凯胡波牛春光叶显君任莹叶繁
Owner 贵州金瑞新材料有限责任公司
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