Method for preparing ultrafine manganese dioxide from potassium permanganate and potassium manganate

A technology of potassium permanganate and manganese dioxide, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of preparing ultrafine manganese dioxide without patent publication, and achieve the improvement of hydrothermal reaction efficiency, high particle uniformity, Simple to use effects

Active Publication Date: 2017-03-22
山东华太新能源电池有限公司
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  • Application Information

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Problems solved by technology

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Method used

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Effect test

Embodiment 1

[0034] (1) A hydrothermal reaction: Potassium permanganate is placed in deionized water to form a concentration of potassium permanganate solution that is 58g / L, and a certain amount of oxalic acid is added to make the mol ratio of oxalic acid and potassium permanganate be 0.95: 1. Add polyethylene glycol to make the concentration reach 1g / L, then quickly transfer the mixed solution to a hydrothermal reaction kettle, place the hydrothermal reaction kettle in a water bath and perform a hydrothermal reaction at a temperature of 25°C. Intense stirring is carried out in the process, and the carbon dioxide gas obtained is collected for the chemical reaction of step (2), and a mixed material is obtained after a hydrothermal reaction for 0.5 hours;

[0035] (2) Secondary hydrothermal reaction: Add potassium manganate to the mixed material obtained in step (1) to make the concentration of potassium manganate reach 46g / L, and heat up to 45°C for secondary hydrothermal reaction. Stir vi...

Embodiment 2

[0038] (1) A hydrothermal reaction: Potassium permanganate is placed in deionized water to be made into the potassium permanganate solution that concentration is 59g / L, adds a certain amount of oxalic acid and makes the mol ratio of oxalic acid and potassium permanganate be 0.9: 1. Add polyethylene glycol to make the concentration reach 1.2g / L, then quickly transfer the mixed solution to a hydrothermal reaction kettle, place the hydrothermal reaction kettle in a water bath and perform a hydrothermal reaction at a temperature of 26°C. Stir vigorously during the reaction, collect the carbon dioxide gas obtained for the chemical reaction of step (2), and obtain the mixed material after a hydrothermal reaction for 0.8 hours;

[0039] (2) Secondary hydrothermal reaction: Add potassium manganate to the mixed material obtained in step (1) so that the concentration of potassium manganate is 50g / L, and heat up to 50°C for secondary hydrothermal reaction. Stir vigorously and continue to...

Embodiment 3

[0042](1) One-time hydrothermal reaction: put potassium permanganate in deionized water to form a potassium permanganate solution with a concentration of 60g / L, add a certain amount of oxalic acid so that the molar ratio of oxalic acid to potassium permanganate is <0.8 : 1, then add polyethylene glycol to make its concentration reach 1.3g / L, then quickly transfer the mixed solution to a hydrothermal reaction kettle, place the hydrothermal reaction kettle in a water bath and carry out a hydrothermal reaction at a temperature of 27°C , vigorously stirred during the reaction, and the carbon dioxide gas obtained was collected for the chemical reaction of step (2), and a mixed material was obtained after a hydrothermal reaction for 0.6 hours;

[0043] (2) Secondary hydrothermal reaction: Add potassium manganate to the mixed material obtained in step (1) to make the concentration of potassium manganate reach 49g / L, and heat up to 48°C for secondary hydrothermal reaction. Stir vigoro...

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Abstract

The invention relates to a method for preparing ultrafine manganese dioxide from potassium permanganate and potassium manganate. The method comprises the following steps: primary hydro-thermal reaction, secondary hydro-thermal reaction, filtering and separating, roasting, etc. The method is short in process flow and mild in conditions and does not need complex equipment; and a manganese dioxide product has high purity, and the maximal granularity of the manganese dioxide product can reach a micron grade.

Description

technical field [0001] The invention relates to a method for preparing manganese dioxide, in particular to a method for preparing superfine manganese dioxide by using potassium permanganate and potassium manganate. Background technique [0002] Manganese dioxide has a wide range of industrial uses, often used in the production of depolarizers for dry batteries, catalysts and oxidants in the synthesis industry, colorants and decolorizers in the glass industry and enamel industry, etc. Raw material for castings, gas masks and electronic materials. [0003] Manganese dioxide is one of the main electrode materials of zinc-manganese batteries. The electrochemical performance of manganese dioxide is mainly affected by factors such as its crystal structure, particle size and composition. The size of manganese dioxide particles has a great influence on the electrochemical performance of batteries. The preparation of ultrafine manganese dioxide is of great significance to the improv...

Claims

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Application Information

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IPC IPC(8): C01G45/02
CPCC01G45/02
Inventor 王晓东修志浩
Owner 山东华太新能源电池有限公司
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