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Method for preparing superfine manganese dioxide from potassium permanganate

A technology of potassium permanganate and manganese dioxide, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of no seed crystal preparation and seed crystal addition technology, and achieve the effect of maintaining air pressure, simple operation and maintaining stability

Active Publication Date: 2017-03-22
广西下田锰矿有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, in addition to the above-mentioned patents, there are no more published patent technologies or other public documents similar to the subject of this patent in China, and there is no patent publication related to seed crystal preparation and seed crystal addition technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of seed crystals: Potassium permanganate is placed in deionized water to form a 30g / L potassium permanganate solution, oxalic acid is added at a molar ratio of 1:1, and then polyethylene glycol is added to make the polyethylene glycol The concentration in the solution reaches 1g / L, and then the mixed solution is quickly transferred to a hydrothermal reaction kettle, and the hydrothermal reaction kettle is placed in a water bath at a temperature of 25°C for 0.5 hours of hydrothermal reaction, and the mixed material is filtered and washed , the obtained solid precipitate is the seed crystal;

[0035] (2) Ratio of materials: prepare a potassium permanganate solution with a concentration of 55g / L, add seed crystals to the solution, the ratio of the quality of the seed crystals to the mass of potassium permanganate in the solution is 1:3, and stir evenly;

[0036] (3) Hydrothermal reaction: the mixture of the potassium permanganate solution obtained in step (...

Embodiment 2

[0039] (1) Preparation of seed crystals: Potassium permanganate is placed in deionized water to form a 35g / L potassium permanganate solution, oxalic acid is added at a molar ratio of 2:1, and then polyethylene glycol is added to make the polyethylene glycol The concentration in the solution reaches 1.2g / L, and then the mixed solution is quickly transferred to the hydrothermal reaction kettle, and the hydrothermal reaction kettle is placed in a water bath to carry out the hydrothermal reaction at a temperature of 30°C for 1 hour, and the mixed material is filtered, Washing, the obtained solid precipitate is the seed crystal;

[0040] (2) Ratio of materials: prepare a potassium permanganate solution with a concentration of 58g / L, add seed crystals to the solution, the ratio of the quality of the seed crystals to the mass of potassium permanganate in the solution is 1:4, and stir evenly;

[0041] (3) Hydrothermal reaction: the mixture of the potassium permanganate solution obtain...

Embodiment 3

[0044] (1) Preparation of seed crystals: Potassium permanganate is placed in deionized water to form a 40g / L potassium permanganate solution, oxalic acid is added at a molar ratio of 4:3, and then polyethylene glycol is added to make the polyethylene glycol The concentration in the solution reaches 1.5g / L, and then the mixed solution is quickly transferred to a hydrothermal reaction kettle, and the hydrothermal reaction kettle is placed in a water bath for 1.5 hours at a temperature of 25 to 40°C, and the mixed material is Filtration, washing, the obtained solid precipitate is the seed crystal;

[0045] (2) Ratio of materials: prepare a potassium permanganate solution with a concentration of 60g / L, add seed crystals to the solution, the ratio of the quality of the seed crystals to the mass of potassium permanganate in the solution is 1:5, and stir evenly;

[0046](3) Hydrothermal reaction: the mixture of the potassium permanganate solution obtained in step (2) and the seed cry...

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Abstract

The invention relates to a method for preparing superfine manganese dioxide from potassium permanganate. The method comprises the following steps: crystal seed preparation, material proportioning, hydrothermal reaction, filter separation, roasting and the like. The method has the advantages of short technical process, mild conditions and no need of complex equipment. The manganese dioxide product has higher purity, and the maximum particle size can reach nano scale.

Description

technical field [0001] The invention relates to a method for preparing manganese dioxide, in particular to a method for treating potassium permanganate solution with crystal seeds to obtain superfine manganese dioxide. 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 im...

Claims

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Application Information

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IPC IPC(8): C01G45/02
CPCC01G45/02C01P2004/61
Inventor 王晓东修志浩
Owner 广西下田锰矿有限责任公司
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