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Process for preparing potassium manganate by liquid phase method

A technology for preparing potassium manganate and liquid phase method, applied in the direction of manganate/permanganate, etc., can solve the problems of liquid alkali heat loss, large processing capacity, etc., to improve quality, improve purity, and solve the problem of volume balance Effect

Inactive Publication Date: 2012-03-07
YUNNAN JIANSHUI MANGANESE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In addition, a large amount of cooling water is used for cooling during cooling and crystallization, which not only has a large processing capacity but also causes a large amount of heat loss of liquid caustic soda

Method used

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  • Process for preparing potassium manganate by liquid phase method
  • Process for preparing potassium manganate by liquid phase method

Examples

Experimental program
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Effect test

example 1

[0039] First, make potassium hydroxide with a concentration of 60wt% and MnO in the state of heating and melting 2 Manganese powder with a content of 65 wt % and a particle size of 80 μm undergoes an oxidation reaction to obtain a mixture of potassium manganate and molten potassium hydroxide.

[0040] Then, pass the high-temperature feed liquid after the oxidation reaction through the ceramic filter plate, so that the molten alkali and most of the impurities and a small amount of potassium manganate pass through the filter plate, while most of the potassium manganate crystals remain on the filter plate. To increase efficiency, vacuum filtration is used.

[0041] The filtrate and the filter cake were cooled respectively and sent for sample analysis. As a result, the content of potassium manganate in the filter cake reached 92.5wt%, and the potassium manganate in the filtrate was 7.5wt% of the potassium manganate generated by the total reaction.

example 2

[0043] First, the concentration of 70wt% potassium hydroxide in the state of heating and melting with MnO 2 Manganese powder with a content of 48wt% and a particle size of 100 μm was oxidized to obtain a mixture of potassium manganate and molten potassium hydroxide.

[0044] The high-temperature feed liquid after the oxidation reaction passes through the ceramic filter plate, the molten alkali and most impurities and a small amount of potassium manganate pass through the filter plate, and most of the potassium manganate crystals remain on the filter plate. In order to improve efficiency, high temperature Press filter.

[0045] The filtrate and the filter cake were cooled respectively and sent for sample analysis. As a result, the content of potassium manganate in the filter cake reached 90.1wt%, and the potassium manganate in the filtrate was 9.9wt% of potassium manganate reacted in total.

[0046] Compared with Example 1, the time used for pressure filtration is shortened by...

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Abstract

The invention discloses a process for preparing potassium manganate by a liquid phase method. The process comprises the following steps: A) carrying out oxidation reaction on a potassium hydroxide solution and manganese powder under the heating and melting liquid phase condition to obtain a mixture of potassium manganate and molten potassium hydroxide; and B) carrying out solid-liquid separation on the mixture to obtain a potassium manganate crystal. According to the process for preparing potassium manganate by the liquid phase method disclosed by the embodiment of the invention, the hydrothermal separation of potassium manganate and high-temperature liquid alkali can be realized, thereby well solving the volume balance problem of a system, greatly improving the purity of the potassium manganate crystal obtained by hydrothermal separation, improving the quality of the potassium manganate crude crystal and reducing the difficulty of subsequent decontamination; and in addition, molten thermokalite obtained by hydrothermal separation can be directly returned back for burdening so as to be beneficial to good and effective utilization of heat energy.

Description

technical field [0001] The invention belongs to the field of chemistry and chemical engineering, and in particular relates to a process for preparing potassium manganate by a liquid phase method. Background technique [0002] The most critical step in the preparation of potassium permanganate is the preparation of potassium manganate. In the traditional process of preparing potassium manganate by liquid phase method, the high-temperature feed liquid after oxidation reaction is diluted with electrolytic mother liquor, cooled and crystallized, then filtered, and the filter cake is dissolved to remove impurities to obtain potassium manganate, and the filtrate is sent to the batching process. [0003] There are following problems in this process: [0004] First of all, when the high-temperature feed liquid is directly diluted with the electrolytic mother liquid, a large amount of steam will be generated, and a condensation recovery device is required for steam recovery, and mos...

Claims

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Application Information

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IPC IPC(8): C01G45/12
Inventor 王吉坤彭东张承贵嵇晓沧马进闫江峰任敏张红耀杨世诚李辉张学文谢红艳
Owner YUNNAN JIANSHUI MANGANESE
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