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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

Inactive Publication Date: 2014-02-05
GUANGXI GUILIU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the complex and cumbersome preparation process of electrolytic manganese dioxide specially used for zinc / manganese dioxide batteries, the preparation process takes a long time, low efficiency, cost and other problems, and provides a method for preparing zinc / manganese dioxide by using low-grade manganese oxide ore. A method for preparing electrolytic manganese dioxide special for manganese batteries, reducing its preparation cost and simplifying the process, and obtaining a special electrolytic manganese dioxide product with high performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 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. The stirring speed is 60rpm and the temperature is 90 °C for 2 hours, then adjust the stirring speed to 30rpm, the temperature is 95 °C, and simultaneously feed sulfur dioxide SO 2 Gas, manganese oxide ore powder and sulfur dioxide SO 2 The ratio of gas feeding rate is 10000g:2.0mol, the reaction time is 1.5 hours, and the crude manganese sulfate solution 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 more than 20%, and the concentrated sulfuric acid is industrial grade H 2 SO 4 ≥97%.

[0025] b. Neutralization and iron removal: under normal temperature conditions, add ammonium bicarbonate to the crude manganese sulfate solution slurry obtained in step a ...

Embodiment 2

[0031] 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: 1800g. °C for 2 hours, then adjust the stirring speed to 50rpm and the temperature to 90 °C, while feeding sulfur dioxide SO 2 Gas, manganese oxide ore powder and sulfur dioxide SO 2 The ratio of gas feeding rate is 10000g:0.5mol, the reaction time is 1.0 hour, and the crude manganese sulfate solution 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 impurity removal: heat the crude manganese sulfate solution obtained in step b to 85-90°C, slowly add barium sulfide at a r...

Embodiment 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. Stirring speed is 80rpm, temperature is 87 °C for 2.5 hours, then adjust the stirring speed to 40rpm and the temperature to 93 °C, while feeding sulfur dioxide SO 2 Gas, manganese oxide ore powder and sulfur dioxide SO 2 The ratio of gas feeding rate is 10000g:3.0mol, the reaction time is 1.5 hours, and the crude manganese sulfate solution is obtained by leaching. The manganese content in the manganese oxide ore powder used in the present invention is 18%, the S in the pyrite powder is more than or equal to 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 impurity removal: heat the crude manganese sulfate soluti...

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Abstract

The invention belongs to the field of cell material processing and specifically discloses a preparation method of a special electrolytic manganese dioxide for a button type alkaline zinc / manganese dioxide cell. The preparation method comprises the following steps: performing manganese sulfate leaching, neutralizing and removing iron, removing impurities for heavy metals, electrolyzing and performing post-processing. Manganese oxide mineral powder, pyrite powder and industrial sulphuric acid are soaked in the presence of SO2 to prepare crude manganese sulfate liquor; iron is removed by ammonium bicarbonate liquor; heavy metals are removed by utilizing barium sulphide; a manganese dioxide semi-finished product is obtained at a positive electrode through periodic electrolysis; the special electrolytic manganese dioxide is finally obtained by post-processing. According to the preparation method disclosed by the invention, production process is simplified, the production process efficiency is improved, and the performance of obtained products is excellent, and finally, the production cost is lowered.

Description

technical field [0001] The invention belongs to the field of battery material processing, in particular to a method for preparing electrolytic manganese dioxide special for a button-type alkaline zinc / manganese dioxide battery. Background technique [0002] Zinc / manganese dioxide batteries use Zn as the negative electrode, Mn0 2 A battery series for the positive pole. The electrolyte can be neutral NH4Cl, ZnCl2 aqueous solution or alkaline KOH aqueous solution, referred to as zinc-manganese battery. At present, in order to improve the performance of zinc / manganese dioxide battery, its raw and auxiliary materials have become a research hotspot. The morphology of zinc powder is very important for mercury-free alkaline manganese battery, it affects the activity and contact performance of zinc powder. Zinc powders with irregular shapes are mainly in the market now, among which there are dendritic, oblate and drop-shaped zinc powders. This type of zinc powder has a large ...

Claims

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Application Information

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IPC IPC(8): H01M4/50C01G45/02C22B3/08C22B3/44C25B1/21
CPCC01G45/02C25B1/21H01M4/50Y02E60/10
Inventor 吴元花覃胜先闭越斌杨礼光刘革胜许雄新
Owner GUANGXI GUILIU CHEM CO LTD
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