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Method for preparing potassium manganate

A technology of potassium manganate and potassium hydroxide, applied in the directions of manganate/permanganate and the like, can solve the problems of the preparation method of potassium manganate needing to be improved, the conversion rate of manganese dioxide is low, the recovery rate of KOH is low, and the like. Significant energy saving and environmental protection, high recovery rate, and lower production costs

Active Publication Date: 2014-02-12
YUNNAN JIANSHUI MANGANESE
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Problems solved by technology

Due to the limitations of the process itself and the MnO 2 Powder activity is poor, MnO 2 The oxidation reaction is not complete, resulting in MnO 2 low conversion rate
In the process of preparing potassium permanganate by liquid phase oxidation, the preparation process of potassium manganate still has the problems of low conversion rate of manganese dioxide, low recovery rate of manganese and KOH, high energy consumption, and serious environmental pollution.
[0003] Thereby, the preparation method and the equipment of potassium manganate still need to be improved at present

Method used

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  • Method for preparing potassium manganate
  • Method for preparing potassium manganate
  • Method for preparing potassium manganate

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preparation example Construction

[0052] The above part has described in detail the method for preparing potassium manganate of the present invention. In order to better understand the method, the equipment capable of implementing the method will be described in detail below.

[0053] According to another aspect of the present invention, the present invention also provides a reactor 1000 . According to an embodiment of the present invention, refer to figure 2 and image 3 , the reactor 1000 includes: a body 100 , a slurry heating device 200 and a stirring device 300 . The inventors surprisingly found that the reactor 1000 of the present invention can efficiently prepare potassium manganate, and the reactor is simple in structure, easy to operate, uses clean energy, has high heat utilization rate, and is easy to realize large-scale industrial production.

[0054] According to an embodiment of the present invention, a reaction space is defined in the body 100, an oxygen inlet 101, a waste oxygen outlet 102, a...

Embodiment 1

[0077] use figure 2 or image 3 The reactor shown, and Figure 4 Shown system, according to the method for preparing potassium manganate described above, prepare potassium manganate according to the following steps:

[0078] a. Oxidation reaction: the first potassium hydroxide solution with a concentration of 45-70% by weight is mixed with pyrolusite in a ratio of 1:5-15 according to the mass ratio of manganese dioxide and potassium hydroxide in the first potassium hydroxide solution Ore slurry is formed, and oxidation reaction is carried out in an oxygen-enriched atmosphere at 250-260 degrees Celsius and 0.2-1.2Mpa to obtain potassium manganate feed liquid;

[0079] b. Solid-night separation: After the potassium manganate feed liquid is allowed to stand for an appropriate time, solid-liquid separation is carried out so as to obtain supernatant and underflow respectively;

[0080] c. Stay crystal growth: use the second potassium hydroxide solution to adjust the Baume degre...

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Abstract

The invention discloses a method for preparing potassium manganate. The method comprises the following steps: in an oxygen-enriched atmosphere, at 250-260 DEG C and 0.2-1.2 MPa, causing a first potassium hydroxide solution with concentration being 45-70 weight percent and manganese dioxide to conduct oxidation reaction to obtain potassium manganate material liquid; standing the potassium manganate material liquid and carrying out solid-liquid separation to respectively obtain supernatant and bottom flow; utilizing a second potassium hydroxide solution to adjust the baume degree of the bottom flow to 50 and then staying for crystal growing to obtain a first solid-liquid mixture; carrying out first filter-pressing separation for the first solid-liquid mixture to respectively a solid mixture and filter-pressing waste liquid, wherein the solid mixture is potassium manganate. The method utilized for producing potassium manganate has the advantages of simple production processes, high manganese dioxide conversion rate, high recovery rate of manganese and potassium hydroxide, low energy consumption, cleanness and environmental friendliness.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method for preparing potassium manganate. Background technique [0002] At present, the preparation technology of industrial potassium permanganate is mainly divided into solid-phase oxidation method and liquid-phase oxidation method. Due to the limitations of the process itself and the MnO 2 Powder activity is poor, MnO 2 The oxidation reaction is not complete, resulting in MnO 2 Low conversion rate. In the process of preparing potassium permanganate by liquid phase oxidation, the preparation process of potassium manganate still has the problems of low conversion rate of manganese dioxide, low recovery rate of manganese and KOH, high energy consumption and serious environmental pollution. [0003] Therefore, the preparation method and equipment of potassium manganate still need to be improved. Contents of the invention [0004] The present invention aims to solve at lea...

Claims

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Application Information

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IPC IPC(8): C01G45/12
Inventor 王吉坤嵇晓沧闫江峰刘大雄马进张红耀户少勇彭东杨世诚李天杰纳吉兴杭祖辉
Owner YUNNAN JIANSHUI MANGANESE
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