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Preparation method of battery-grade manganese dioxide

A manganese dioxide, battery-grade technology, used in manganese oxide/manganese hydroxide, battery electrodes, circuits, etc., can solve the problems of difficult waste liquid treatment, low efficiency, and outstanding environmental protection problems.

Pending Publication Date: 2021-03-26
广西锰华新能源科技发展有限公司
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

At present, the main method for preparing battery-grade chemical manganese dioxide (CMD) is to use low-valent manganese compounds to react with strong oxidant chlorine, hypochlorous acid or their salts under certain chemical conditions to prepare manganese dioxide. The preparation process of this method is mature. But there are also significant deficiencies: the production cost is high, the waste liquid produced is difficult to handle, and the environmental protection problem is outstanding; another preparation method is to utilize air oxidation roasting to prepare chemical manganese dioxide (CMD), and the oxidation time of this process is too long, the efficiency is low, and The content of impurities such as Fe, Ca, Na and S in the product is generally high, the bulk density is low, and the morphology and crystal form are irregular, so it is impossible to prepare high-end manganese-based batteries

Method used

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  • Preparation method of battery-grade manganese dioxide

Examples

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Effect test

Embodiment 1

[0027] Take 130g of industrial manganese sulfate from a factory, dissolve it until the manganese content is 80g / L, take 500ml of manganese sulfate liquid, add it to the potassium carbonate solution with a mass fraction of 10%, control the feeding speed of manganese sulfate to 60ml / min, set the carbonization precipitation The temperature is 40°C, and the stirring rate is 300r / min. After the manganese sulfate liquid was added dropwise, the reaction was continued for 1 hour and then filtered, and the filter cake was taken and dried at 105°C. The dried manganese carbonate was placed in a muffle furnace, the temperature was set at 400° C., the oxygen flow rate was 0.1 L / min, and the thermal decomposition reaction was carried out for 6 hours to obtain crude manganese dioxide. Slurry the crude manganese dioxide according to the solid-to-liquid ratio of 1:2, add 50% sulfuric acid dropwise until the pH of the slurry remains at 1, then add a theoretical amount of potassium permanganate ...

Embodiment 2

[0029] Take 500g of an industrial manganese sulfate, dissolve it so that the manganese content is 90g / L, take 1500ml of manganese sulfate liquid, add it to the potassium carbonate solution with a mass fraction of 12%, control the feeding speed of manganese sulfate to 70ml / min, set the carbonization precipitation The temperature is 50° C., and the stirring rate is 350 r / min. After adding the materials, continue to react for 1 hour, then filter, take the filter cake, and dry it at 105°C. The dried manganese carbonate was placed in a muffle furnace, the temperature was set at 550° C., the oxygen flow rate was 0.1 L / min, and the thermal decomposition reaction was performed for 5 hours to obtain crude manganese dioxide. Slurry the crude manganese dioxide according to the solid-to-liquid ratio of 1:2, add 50% sulfuric acid dropwise until the pH of the slurry remains at 1, then add a theoretical amount of potassium permanganate according to the total manganese content of the liquid. ...

Embodiment 3

[0031] Take 1kg of an industrial manganese sulfate, dissolve it so that the manganese content is 100g / L, take 3000ml of manganese sulfate liquid, add it to the potassium carbonate solution with a mass fraction of 15%, control the feeding speed of manganese sulfate to 60ml / min, set the carbonization precipitation The temperature is 40° C., and the stirring rate is 300 r / min. After adding the materials, continue to react for 1 hour, then filter, take the filter cake, and dry it at 105°C. Place the dried manganese carbonate in a muffle furnace, set the temperature at 500° C., and set the oxygen flow rate at 0.15 L / min. Thermally decompose it for 4 hours to obtain crude manganese dioxide. The crude manganese dioxide is slurried according to the solid-to-liquid ratio of 1:2, and 50% sulfuric acid is added dropwise until the ph of the slurry remains at 1. Then, according to the total manganese content of the liquid, a theoretical amount of potassium permanganate is added. Stir and ...

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Abstract

The invention discloses a preparation method of battery-grade manganese dioxide. The preparation method comprises the following steps: respectively dissolving industrial manganese sulfate and potassium carbonate in water to prepare an industrial manganese sulfate solution and a potassium carbonate solution with certain concentrations for later use; mixing the industrial manganese sulfate solutionand the potassium carbonate solution, carrying out heating, conducting stirring to realize a sufficient reaction, and performing filtering and drying to obtain manganese carbonate; introducing oxygeninto the manganese carbonate, and conducting heating until the manganese carbonate is decomposed to obtain crude manganese dioxide; dissolving manganese dioxide, adding sulfuric acid, adding a properamount of an oxidant, and conducting full mixing and reacting to obtain heavy manganese dioxide; and drying the manganese dioxide under a proper temperature condition to obtain the battery-grade chemical manganese dioxide. A chemical manganese dioxide product applicable as a power battery raw material is prepared by using the method, and the method is environment-friendly and clean in process, andsuitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of battery material preparation, in particular to a method for preparing battery-grade manganese dioxide. Background technique [0002] Battery cathode material is the key material of lithium-ion batteries. The rapid growth of lithium-ion battery production has driven the explosive growth of demand for lithium-ion battery cathode materials. Battery-grade chemical manganese dioxide (CMD)) is the basic raw material for lithium-ion batteries , is the priority development direction for the development and utilization of manganese resources. At present, the main method for preparing battery-grade chemical manganese dioxide (CMD) is to use low-valent manganese compounds to react with strong oxidant chlorine, hypochlorous acid or their salts under certain chemical conditions to prepare manganese dioxide. The preparation process of this method is mature. But there are also significant deficiencies: the production c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02C05D1/02H01M4/50
CPCC01G45/02C05D1/02H01M4/50C01P2006/40Y02E60/10
Inventor 莫燕娇杨雄强甘永兰张帆
Owner 广西锰华新能源科技发展有限公司
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