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A kind of decalcification method of electrolytic manganese dioxide

A technology of electrolytic manganese dioxide and electrolyte, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of incomplete precipitation process, difficulty in removing calcium ions, and inability to meet the demand for high-quality electrolyte, and achieve a suitable large-scale Large-scale production, low mechanical equipment requirements, simple process effect

Active Publication Date: 2015-12-30
GUANGXI ERAMET COMILOG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pH range set by the invention is very large, which cannot meet the demand for high-quality electrolyte
The precipitation process is not complete, and it is difficult to remove calcium ions by this precipitation method

Method used

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  • A kind of decalcification method of electrolytic manganese dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Put the high-calcium electrolytic manganese dioxide powder into the electrolyte, the molar ratio of sulfuric acid and manganese sulfate in the electrolyte is 1:600, soak at 60°C for 60 minutes. Vacuum filtration, control the pH value below 3.0;

[0023] (2) Dry in an oven at a temperature of 110°C. The time is 120 minutes. Slurry with water;

[0024] (3) Neutralization: add 1mol / L sodium hydroxide, adjust the pH value to 5.5, control the temperature at 60°C, and last for 60 minutes;

[0025] (4) Dry in an oven at a temperature of 110°C. The time is 120 minutes.

Embodiment 2

[0027] (1) Put the high-calcium electrolytic manganese dioxide powder into the electrolyte, the molar ratio of sulfuric acid and manganese sulfate in the electrolyte is 2:1, soak at 40°C for 100 minutes. Vacuum filtration, control the pH value below 4.5;

[0028] (2) Dry in an oven at 60°C. The time is 180 minutes. Slurry with aqueous solution;

[0029] (3) Neutralization: add 0.5mol / L sodium hydroxide, adjust the pH value to 5.0, control the temperature at 70°C, and last for 30 minutes;

[0030] (4) Dry in an oven at a temperature of 120°C. The time is 60 minutes.

Embodiment 3

[0032] (1) Put the high-calcium electrolytic manganese dioxide powder into the electrolyte, the molar ratio of sulfuric acid and manganese sulfate in the electrolyte is 1:450000, soak at a temperature of 75°C for 30 minutes. Vacuum filtration, control the pH value below 3.0.

[0033] (2) Dry in an oven at a temperature of 120°C. The time is 120 minutes. Slurry with aqueous solution;

[0034] (3) Neutralization: add 3mol / L sodium hydroxide, adjust the pH value to 5.8, control the temperature at 40°C, and last for 100 minutes;

[0035] (4) Dry in an oven at a temperature of 90°C. The time is 180 minutes.

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Abstract

The invention belongs to the field of battery material processing, and in particular relates to a method for removing calcium from electrolytic manganese dioxide. The method comprises the following steps: putting high-calcium electrolytic manganese dioxide powder into the electrolytic solution, soaking, controlling the soaking temperature, time and pH value, filtering; drying, pulping; neutralization: adding alkali to adjust the pH value, controlling temperature and time; drying. After the treatment of the invention, the calcium in the high-calcium electrolytic manganese dioxide can be effectively removed, and the product purity can be improved.

Description

technical field [0001] The invention belongs to the field of battery material processing, and in particular relates to a method for removing calcium from electrolytic manganese dioxide. Background technique [0002] Electrolytic manganese dioxide (EMD) is an excellent depolarizer for batteries. Compared with dry batteries produced by natural discharge manganese dioxide, it has large discharge capacity, strong activity, small size, long life, stable working voltage, and low temperature performance. and good leak-proof performance, dry batteries made with 20-30% EMD are better than those made with natural MnO 2 The discharge capacity of the dry battery made can be increased by 50-100%. If 50-70% EMD is mixed in the high-performance zinc chloride battery, the discharge capacity can be increased by 2-3 times. Alkaline manganese batteries made of EMD, Its discharge capacity can be increased by 5-7 times, so electrolytic manganese dioxide has become a very important raw material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
Inventor 陈书科张学英
Owner GUANGXI ERAMET COMILOG CHEM
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