Preparation method of specia electrolytic manganese dioxide for button type alkaline zinc/manganese dioxide cell
A technology of electrolytic manganese dioxide and manganese dioxide, applied in the direction of manganese oxide/manganese hydroxide, battery electrodes, electrolytic components, etc., can solve the problems of low efficiency, long preparation process time, complex and cumbersome preparation process, etc., and achieve particle size distribution Highly uniform, highly uniform quality, and reasonable crystal phase structure
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[0023] Example 1
[0024] a. Manganese sulfate leaching: Put manganese oxide ore powder, pyrite powder, and industrial sulfuric acid with a particle size of ≥150 mesh into the leaching reaction tank at a weight ratio of 10000g:1000g:2000g, at a stirring speed of 60rpm and a temperature of 90 React for 2 hours under the condition of ℃, then adjust the stirring speed to 30rpm, the temperature to 95℃, and introduce sulfur dioxide SO 2 Gas, manganese oxide ore powder and sulfur dioxide SO 2 The ratio of the gas flow rate is 10000g:2.0mol, the reaction time is 1.5 hours, and the crude manganese sulfate slurry is obtained by leaching. The manganese content in the manganese oxide ore powder used in the present invention is 20%, the S in the pyrite powder is ≥ 20%, and the concentrated sulfuric acid is industrial grade H 2 SO 4 ≥97%.
[0025] b. Neutralization and removal of iron: Under normal temperature conditions, add ammonium bicarbonate to the crude manganese sulfate slurry obtained i...
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[0030] Example 2
[0031] a. Manganese sulfate leaching: Put manganese oxide powder, pyrite powder, and industrial sulfuric acid with a particle size of ≥150 mesh into the leaching reaction tank at a weight ratio of 10000g: 1200g: 1800g, at a stirring speed of 100rpm and a temperature of 85 React at ℃ for 2 hours, then adjust the stirring speed to 50rpm, the temperature to 90℃, and at the same time introduce sulfur dioxide SO 2 Gas, manganese oxide ore powder and sulfur dioxide SO 2 The ratio of the amount of gas introduced is 10000g:0.5mol, the reaction time is 1.0 hour, and the crude manganese sulfate slurry is obtained by leaching. The manganese content in the manganese oxide ore powder used in the present invention is 16%, the S in the pyrite powder is ≥20%, and the concentrated sulfuric acid is industrial grade H 2 SO 4 ≥97%.
[0032] b. Neutralization and iron removal: the operation steps are the same as in Example 1.
[0033] c. Heavy metal removal: heat the crude manganese s...
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[0037] Example 3
[0038] a. Manganese sulfate leaching: Put manganese oxide ore powder, pyrite powder and industrial sulfuric acid with a particle size of ≥150 mesh into the leaching reaction tank at a weight ratio of 10000g: 1200g: 1000g, at a stirring speed of 80 rpm and a temperature of 87 React for 2.5 hours at ℃, then adjust the stirring speed to 40rpm, the temperature to 93℃, and at the same time introduce sulfur dioxide SO 2 Gas, manganese oxide ore powder and sulfur dioxide SO 2 The ratio of the gas flow rate is 10000g:3.0mol, the reaction time is 1.5 hours, and the crude manganese sulfate slurry is obtained by leaching. The manganese content in the manganese oxide powder used in the present invention is 18%, the S in the pyrite powder is ≥20%, and the concentrated sulfuric acid is industrial grade H 2 SO 4 ≥97%.
[0039] b. Neutralization and iron removal: the operation steps are the same as in Example 1.
[0040] c. Heavy metal removal: heat the crude manganese sulfate so...
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