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Production method for electrolytic manganese dioxide

An electrolytic manganese dioxide, production method technology, applied in chemical instruments and methods, cleaning methods using liquids, electrolytic components, etc., can solve the problem that the pH value of electrolytic manganese dioxide products cannot be well controlled, and the High-quality electrolytic manganese dioxide products cannot be removed well, etc., to achieve good economic and social benefits, low production costs, and improved quality.

Active Publication Date: 2012-09-12
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 production method for special electrolytic manganese dioxide for high-performance mercury-free alkaline batteries, comprising the following steps:

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

Embodiment 2

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

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

Embodiment 3

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

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

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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 Patents(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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