Preparation method and used reaction system of trimanganese tetraoxide, and uses of used reaction system

A technology of trimanganese tetraoxide and reaction system, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of low dissolved oxygen rate, low production efficiency, low dissolved oxygen amount, etc., and achieve the effect of ensuring the reaction rate

Active Publication Date: 2018-01-05
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the low dissolved oxygen amount and low dissolved oxygen rate in the liquid phase under normal pressure are the main reasons for the slow conversion rate, long reaction time, low production efficiency, low oxygen utilization rate, and impurities in the products of the above two preparation methods.

Method used

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  • Preparation method and used reaction system of trimanganese tetraoxide, and uses of used reaction system
  • Preparation method and used reaction system of trimanganese tetraoxide, and uses of used reaction system
  • Preparation method and used reaction system of trimanganese tetraoxide, and uses of used reaction system

Examples

Experimental program
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Effect test

Embodiment 1

[0094] Example 1 Weigh 8.8g of manganese hydroxide solid and 500mL of pure water into the normal-pressure reaction kettle, extract 800mL of the reaction liquid mixture in the reaction kettle at one time and pass it into the micro-nano bubble generator, and pass it into the air to obtain air-containing micro-nano Air-liquid mixture with bubbles. The average diameter of the micro-nano bubbles in the liquid-gas mixture is 15.3 μm. In the micro-nano-bubble aqueous solution, the oxygen content in the liquid-gas mixture is 26 mg / L, and the volume ratio of the gaseous oxygen in the micro-nano bubbles to the reaction liquid mixture is 0.16. Then put the liquid-gas mixture into the reaction kettle, react at room temperature and normal pressure for 2.0 hours, and the obtained solid phase is trimanganese tetraoxide.

[0095] figure 2 is the particle size and morphology of the crystals of trimanganese tetraoxide prepared in Example 1 of the present invention;

[0096] image 3 is the ...

Embodiment 2

[0097] Example 2 Weighed 70.0 g of manganese monoxide solid and 4000 mL of pure water into the reactor, and injected 10.0 L of liquid-gas mixture of water with oxygen micro-nano bubbles into the reactor at one time. The average diameter of the micro-nano bubbles is 6.2 μm, the oxygen content in the liquid-gas mixture containing the micro-nano bubbles is 58 mg / L, and the volume ratio of the gaseous oxygen in the micro-nano bubbles to the reaction liquid mixture is 0.63. The temperature was raised to 90°C under normal pressure for 0.5h reaction, and the obtained solid phase was trimanganese tetraoxide.

Embodiment 3

[0098] Embodiment 3 Weigh manganese monoxide solid 7.0g and pure water 250mL and add in the autoclave, in the autoclave, continuously pass into the liquid-gas mixture of the water containing the micro-nano bubbles of air and argon, the flow rate of the liquid-gas mixture is 500.0mL / h. Air and argon account for 90.0vol% and 10.0vol% respectively in the gas. The average diameter of the micro-nano bubbles is 0.2μm. The volume ratio of the reaction liquid mixture was 9.12. Raise the temperature from the pressure to 190°C and react for 0.5h, and the obtained solid phase is trimanganese tetraoxide.

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Abstract

The invention relates to a preparation method and a preparation system of trimanganese tetraoxide. The preparation method comprises: introducing micro-nano gas bubbles into a reaction liquid mixture containing a manganese source to obtain a liquid-gas mixture containing the micro-nano gas bubbles and the reaction liquid mixture, and carrying out a reaction to obtain trimanganese tetraoxide, wherein the micro-nano gas bubbles contain oxidizing gas, and the average valence of the manganese in the manganese source is less than 8/3. According to the present invention, by introducing the micro-nanogas bubbles containing the oxidizing gas into the reaction system containing the manganese source, the oxidation reaction rate is improved, and the oxidation reaction time is shortened; and the generation rate of the trimanganese tetraoxide is increased, the particle size of the trimanganese tetraoxide is reduced, the develop integrity of the trimanganese tetraoxide crystal is improved, and the defect of the crystal is reduced.

Description

technical field [0001] The invention belongs to the field of preparation of trimanganese tetraoxide, and specifically relates to a preparation method of trimanganese tetraoxide, a reaction system used in the preparation method and the application of the reaction system. The preparation method of trimanganese tetraoxide can be The reaction time is obviously shortened, the manganese content is increased, the generation of impurities is reduced and the purity of trimanganese tetraoxide is improved. Background technique [0002] Manganese is one of the common variable-valence metal elements, and its oxide forms are manganese monoxide, trimanganese tetraoxide, manganese trioxide, and manganese dioxide. The primary structural units of manganese oxides are basically the same, all of which are manganese-oxygen octahedra; the secondary structural units are similar, and are connected by shared-edge manganese-oxygen octahedral chains or ribbon chains. Due to the variable valence of ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 卢旭晨王体壮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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