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Method and device for preparing potassium manganate by channelization pressurization

A potassium manganate, pipeline technology, applied in the direction of manganate/permanganate, etc., can solve the problems of ineffective control of pollution, strict quality requirements of manganese ore powder, reduction of material consumption and energy consumption, etc., to achieve the reaction time Shortening, good flow performance and less environmental pollution

Inactive Publication Date: 2009-01-07
云南冶金集团总公司技术中心
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Problems solved by technology

Compared with the solid phase oxidation method, the liquid phase oxidation method has made a major breakthrough in the production process, the production cycle is greatly shortened, the conversion rate of manganese dioxide is improved, the material consumption and energy consumption are reduced, and the labor intensity and operating environment of the workers are improved. Difficulty in adapting equipment, strict requirements on the quality of manganese ore powder, large heat loss, long production cycle, and ineffective control of pollution, etc.

Method used

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  • Method and device for preparing potassium manganate by channelization pressurization

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Experimental program
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Effect test

Embodiment 1

[0018] Embodiment 1: Potassium hydroxide and water are mixed with the alkali solution that mass concentration is 50%, and add manganese powder in alkali solution by mass parts manganese: potassium hydroxide=1: 13 and be mixed with slurry;

[0019] Pump the slurry into a pressurized pipeline reactor, let the slurry flow through the reactor along the pipeline, and at the same time introduce industrial pure oxygen for continuous oxidation reaction, control the residence time of the slurry in the pipeline for 2 hours, and the temperature of the pipeline at 190°C. Pressure 0.6Mpa;

[0020] The slurry after the reaction is cooled and separated in a crystallization tank to obtain potassium manganate crystals and mother liquor, and the mother liquor is returned to prepare slurry.

Embodiment 2

[0021] Embodiment 2: Potassium hydroxide and water are mixed into the alkali solution that mass concentration is 50%, and add manganese powder in alkali solution by mass parts manganese: potassium hydroxide=1:9 and be mixed with slurry;

[0022] Pump the slurry into a pressurized pipeline reactor, let the slurry flow through the reactor along the pipeline, and at the same time introduce industrial pure oxygen for continuous oxidation reaction, control the residence time of the slurry in the pipeline for 2h, and the temperature of the pipeline at 220°C. Pressure 0.8Mpa;

[0023] The slurry after the reaction is cooled and separated in a crystallization tank to obtain potassium manganate crystals and mother liquor, and the mother liquor is returned to prepare slurry.

Embodiment 3

[0024] Embodiment 3: Potassium hydroxide and water are mixed into the alkali solution that mass concentration is 50%, and add manganese powder in alkali solution by mass parts manganese: potassium hydroxide=1: 10 and be mixed with slurry;

[0025] Pump the slurry into the pressurized pipeline reactor, let the slurry flow through the reactor along the pipeline, and at the same time introduce industrial pure oxygen for continuous oxidation reaction, control the residence time of the slurry in the pipeline for 3h, and the temperature of the pipeline at 240°C, Pressure 0.4Mpa;

[0026] The slurry after the reaction is cooled and separated in a crystallization tank to obtain potassium manganate crystals and mother liquor, and the mother liquor is returned to prepare slurry.

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Abstract

The invention relates to a method and a device for preparing potassium manganate by using channelization pressure. The method comprises the following steps: a potassium hydroxide solution, a manganese powder and an industrial pure oxygen go through continuous three-phase oxidation reaction through high temperature pressurization of a pressurizing pipeline reactor; and then cooling and crystallization are conducted to obtain a potassium manganate product. The method has the advantages of simple process, small environmental pollution, high conversation rate of potassium manganate, and high thermal efficiency. Since the three-phase oxidation reaction is conducted in the pressurizing pipeline reactor, the concentration slurry is lower, the concentration of the pump oxygen is high and the reaction temperature is high, the reaction conditions are strengthened, the reaction time is shortened, the conversation rate of MnO2 is high and the flow property of obtained slurry is good.

Description

technical field [0001] The invention belongs to a method and a device for preparing potassium manganate by a chemical wet method, and more specifically relates to a production method and a device for preparing potassium manganate by pipeline pressurization. Background technique [0002] Potassium permanganate is a strong oxidant, and potassium permanganate is an intermediate raw material for the production of potassium permanganate. Potassium permanganate is an important manganese salt product in the inorganic salt industry. In the prior art, the open hearth furnace roasting method, that is, the solid phase oxidation method is mostly used in China; the more advanced technology abroad is to prepare potassium manganate by liquid phase oxidation. Compared with the solid phase oxidation method, the liquid phase oxidation method has made a major breakthrough in the production process, the production cycle is greatly shortened, the conversion rate of manganese dioxide is improved...

Claims

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Application Information

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IPC IPC(8): C01G45/12
Inventor 王吉坤杨大锦彭建蓉董英
Owner 云南冶金集团总公司技术中心
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