A method for reducing carbonate and sulfate radicals in high-concentration potassium hydroxide solution

A potassium hydroxide, high-concentration technology, used in chemical instruments and methods, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve the problem of reducing battery life, poor high current discharge performance, and increasing enterprise production costs, etc. problems, to achieve the effect of reducing disposal costs, achieving emission reduction targets, and reducing waste of resources

Active Publication Date: 2022-02-18
荷贝克电源系统(溧阳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One is to continue to use unqualified lye in the battery, but this method will have a negative impact on the self-discharge and high-current discharge performance of the battery in the later stage, and reduce the service life of the battery
[0006] Another process is that the production enterprise treats the converted potassium hydroxide solution as a hazardous waste liquid and entrusts a third party to process it. On the one hand, it wastes resources, on the other hand, it increases environmental pressure, and at the same time increases the disposal cost of the enterprise. production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of method that reduces carbonate group, sulfate group in high-concentration potassium hydroxide solution, comprises the following steps:

[0022] S1. The filter filters the collected high-concentration waste potassium hydroxide solution to remove mechanical impurities.

[0023] S2. Heating the high-concentration potassium hydroxide solution to be treated to 80-100°C;

[0024] S3. Add 80-100 g / L barium hydroxide powder into the high-concentration potassium hydroxide solution to be treated, and keep stirring for 3-6 hours;

[0025] S4 stands still for 16 to 24 hours, and cools down naturally;

[0026] S5 filters the lye after standing still.

[0027] Further, in S1, a variable-frequency electric field is formed in the high-concentration potassium hydroxide solution, and treated for 1 to 2 hours. Preferably, the working electrodes 8-12A are the electrodes of the variable frequency electric field.

[0028] Further, the frequency range of the variable frequency el...

Embodiment 2

[0031] A kind of method that reduces carbonate group, sulfate group in high-concentration potassium hydroxide solution, comprises the following steps:

[0032] S1. The filter filters the collected high-concentration waste potassium hydroxide solution to remove mechanical impurities;

[0033] S2. Heat the high-concentration potassium hydroxide solution to be treated to 80-100°C; form a variable-frequency electric field in the high-concentration potassium hydroxide solution, and treat it for 1-2 hours; the working electrode of the variable-frequency electric field is 8-12A, and the variable-frequency electric field The frequency range is 40~50kHz;

[0034] S3. Add 80-100 g / L barium hydroxide powder into the high-concentration potassium hydroxide solution to be treated, and keep stirring for 3-6 hours;

[0035] S4 stands still for 16 to 24 hours, and cools down naturally;

[0036] S5 filters the lye after standing still.

[0037] Under the action of the variable frequency elec...

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Abstract

The invention discloses a method for reducing carbonate and sulfate radicals in a high-concentration potassium hydroxide solution, which comprises the following steps: S1 heating the high-concentration potassium hydroxide solution to 80-100°C; S2 heating the high-concentration potassium hydroxide solution to be treated Add 80-100g / L barium hydroxide powder into the concentrated potassium hydroxide solution, and keep stirring for 3-6 hours; S3 stands still for 16-24 hours, and cools naturally; S4 filters the lye after standing. It is also possible to form a variable-frequency electric field in the high-concentration potassium hydroxide solution in S1 and treat it for 1 to 2 hours. The invention solves the unfavorable influence of the barium hydroxide on the treatment of carbonates and sulfates due to the same ion effect under normal temperature conditions. After being treated by the removal method of the present invention, the carbonate and sulfate groups in the high-concentration waste potassium hydroxide lye can be greatly reduced, and can meet the requirements of impurities in the electrolyte in GB / T18270 "Electrolyte for Nickel-Cadmium Open Battery". requirements, it can continue to be used as an alkali for nickel-cadmium batteries.

Description

technical field [0001] The invention relates to a method for reducing carbonate and sulfate radicals in high-concentration potassium hydroxide solution. Background technique [0002] The high-concentration potassium hydroxide lye after the nickel-cadmium open battery is formed contains various impurities, such as carbonate and sulfate. The content of these impurities exceeds the requirements of the standard GB / T18270 "Electrolyte for Nickel-Cadmium Open Battery". [0003] Since the alkali used in the formation is a high-concentration potassium hydroxide solution (KOH content > 20%), the barium hydroxide added at room temperature is prior to barium carbonate due to the same ion effect in the high-concentration potassium hydroxide solution. , Barium sulfate precipitates, so it cannot play the role of eliminating carbonate and sulfate. [0004] Therefore, most enterprises generally adopt two processes to dispose of the high-concentration potassium hydroxide solution after c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D1/28
CPCC01D1/28
Inventor 黄洪波
Owner 荷贝克电源系统(溧阳)有限公司
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