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Production method for electrolytic manganese dioxide

A technology of electrolytic manganese dioxide and a production method, which is applied in the direction of chemical instruments and methods, cleaning methods using liquids, electrolytic components, etc., can solve the problem of not being able to better control the pH value of electrolytic manganese dioxide products, and not being able to produce High-quality electrolytic manganese dioxide products, can not be better removed and other problems, to achieve good economic and social benefits, low production costs, and improve the quality of the effect

Active Publication Date: 2011-10-19
GUANGXI GUILIU CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in the electrolytic manganese dioxide product prepared by the above-mentioned patent application, the sulfuric acid and low-valent manganese remaining in the electrolytic manganese dioxide and the calcium sulfate and magnesium sulfate adsorbed on the surface of the electrolytic manganese dioxide cannot be removed well. The content of manganese dioxide in manganese oxide is low, and the pH value of the electrolytic manganese dioxide product cannot be well controlled, and the product quality is unstable, so it is impossible to produce high-quality electrolytic manganese dioxide products

Method used

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Embodiment 1

[0031] A method for producing electrolytic manganese dioxide special for high-performance mercury-free alkaline batteries, comprising the following steps:

[0032] A. Prepare the mixed solution of crude manganese sulfate and pulp: low-grade manganese oxide ore powder with a particle size of -200 mesh reaching 90%-95% (the manganese content of low-grade manganese oxide ore powder is 17.16%) and particle size of -120 mesh reaching 90% -95% of high activity pyrite powder (the sulfur content of high activity pyrite powder is 35%) and 98% of industrial sulfuric acid and electrolytic waste liquid are put into the continuously stirring leaching reaction tank according to a certain material ratio. The effective volume of the reaction tank is 70m 3 , the process reaction temperature is controlled at 95°C, and the timing starts from the end of feeding to the heating up to 95°C. The reaction time is 3.5 hours, that is, when the pH value reaches 3.0-3.8, it indicates that the leaching rea...

Embodiment 2

[0043] A method for producing electrolytic manganese dioxide special for high-performance mercury-free alkaline batteries, comprising the following steps:

[0044] A. Prepare the mixed solution of crude manganese sulfate and pulp: low-grade manganese oxide ore powder with a particle size of -200 mesh reaching 90%-95% (low-grade manganese oxide ore powder contains 18% manganese by mass), and a particle size of -120 mesh reaching 90% -95% highly active pyrite powder (the sulfur content of high active pyrite powder is 40%) and 98% industrial sulfuric acid and electrolytic waste liquid are put into the continuously stirring leaching reaction tank according to a certain material ratio. The reaction temperature is controlled at 92°C, and the timing starts from the end of feeding until the heating reaches 92°C. The reaction time is 4 hours, that is, when the pH value reaches 3.0-3.8, it indicates that the leaching reaction has been completed, and a mixed solution of crude manganese su...

Embodiment 3

[0055] A method for producing electrolytic manganese dioxide special for high-performance mercury-free alkaline batteries, comprising the following steps:

[0056] A. Prepare the mixed solution of crude manganese sulfate and pulp: low-grade manganese oxide ore powder with a particle size of -200 mesh reaching 90%-95% (low-grade manganese oxide ore powder contains 16% manganese by mass), and a particle size of -120 mesh reaching 90% -95% highly active pyrite powder (the sulfur content of high active pyrite powder is 38%) and 98% industrial sulfuric acid and electrolytic waste liquid are put into the continuously stirring leaching reaction tank according to a certain material ratio. The reaction temperature is controlled at 94°C, and the timing starts from the end of feeding to the heating up to 94°C. The reaction time is 4 hours, that is, when the pH value reaches 3.0-3.8, it indicates that the leaching reaction has been completed, and a mixed solution of crude manganese sulfate...

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Abstract

The invention relates to a production method for electrolytic manganese dioxide. The method comprises the following steps of: A. preparing a mixed liquid of crude manganese sulfate and slurry; B. neutralizing the mixed liquid to remove iron; C. carrying out three-time deep purification on the crude manganese sulfate solution including first purification to remove heavy metals, second purification to remove trace element molybdenum and third purification to remove calcium sulfate and magnesium sulfate; D. electrolyzing; E. rinsing including six steps of washing acid with hot water, rinsing with a weak base, rinsing with a strong base, washing base with hot water, backwashing with a diluted acid and rinsing with hot water; F. milling; and G. mixing to obtain an electrolytic manganese dioxide product. According to the invention, low-grade manganese oxide ore is used as a main raw material to prepare a manganese sulfate solution, the manganese sulfate solution is subjected to deep purification treatment to obtain a high-purity electrolyte, high-performance electrolytic manganese dioxide special for mercury-free alkaline cells and automobile power cells can be respectively produced under different electrolysis conditions, and the obtained electrolytic manganese dioxide product has low impurity content and high quality.

Description

technical field [0001] The invention relates to a production method of electrolytic manganese dioxide, in particular to a method for leaching manganese sulfate solution by oxidation-reduction reaction of low-grade manganese oxide ore and high-activity pyrite under acidic conditions, and the manganese sulfate solution is obtained after deep purification. High-purity electrolyte, this high-purity electrolyte is used under two different electrolytic conditions to produce high-performance mercury-free alkaline battery-specific electrolytic manganese dioxide and automobile power battery-specific electrolytic manganese dioxide. Background technique [0002] Electrolytic manganese dioxide for automotive power batteries is the raw material for the positive electrode material of lithium-ion rechargeable batteries. Lithium-ion battery cathode materials belong to the new energy and new material industry fields supported by the state. Lithium manganese oxide, as a cathode material for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/08C22B3/44C25B1/21B08B3/08
Inventor 吴元花覃胜先许雄新
Owner GUANGXI GUILIU CHEM CO LTD
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