Preparation method for high-activity trimanganese tetraoxide

A manganese tetroxide, high activity technology, applied in manganese oxide/manganese hydroxide and other directions, can solve problems such as fast reaction speed, low specific surface area, environmental pollution, etc., to speed up reaction speed, ensure reaction safety, and reduce production. cost effect

Active Publication Date: 2019-11-08
HUNAN SPECIAL METAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the activity of manganese tetraoxide obtained by this process is low, and its specific surface area is 6-15m 2 Between /g, and the amount of catalyst added is large, usually 1:0.001, and the reaction time is long. The reaction time of 2 tons of raw materials is about 15 to 20 hours, resulting in high production costs, and due to the large amount of catalyst used, subsequent washing is more difficult. , more lotion, more serious environmental pollution
[0004] The patent application with application number 201310214003.0 uses the electrolytic manganese metal suspension method, but the manganese manganese tetraoxide produced has low activity and high production cost; the patent application with application number 201610671638.7

Method used

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  • Preparation method for high-activity trimanganese tetraoxide
  • Preparation method for high-activity trimanganese tetraoxide
  • Preparation method for high-activity trimanganese tetraoxide

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Experimental program
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Example Embodiment

[0034] A preparation method of the highly active trimanganese tetroxide of the present invention includes the following steps:

[0035] (1) The electrolytic manganese sheet is crushed into electrolytic manganese powder with a vertical screw mill under the protection of nitrogen;

[0036] (2) Sift the electrolytic manganese metal powder for classification;

[0037] (3) After fully mixing the electrolytic metal manganese powder under the sieve and the catalyst ammonium chloride in an ammonia atmosphere, add a small amount of deionized water, stir and wet it into a non-caking, flowable slurry, and then add the slurry A suspension is formed in deionized warm water, and oxygen or pure air is continuously introduced into the suspension through a gas pipe, and stirred, so that the electrolytic metal manganese powder is oxidized to trimanganese tetroxide under the action of a catalyst;

[0038] (4) After reacting for 5 to 30 minutes, turn on the ultrasonic generator 5, use the PLC controller ...

Example Embodiment

[0054] Example 1:

[0055] A method for preparing the highly active trimanganese tetroxide of the present invention, the structure diagram of the reaction tank is as figure 1 As shown, including the following steps:

[0056] (1) Use a vertical screw mill to crush the electrolytic metal manganese flakes into electrolytic metal manganese powder under nitrogen protection.

[0057] (2) The electrolytic manganese metal powder is sieved and classified into 150 meshes or less.

[0058] (3) After fully mixing the electrolytic metal manganese powder and ammonium chloride catalyst under the sieve in an ammonia atmosphere, wet with deionized water to form a slurry, press the mixture of electrolytic metal manganese powder, catalyst and deionized warm water at 1:30 The mixture of electrolytic metal manganese powder and catalyst is added to the deionized warm water to form a suspension in the reaction tank 2, and oxygen is continuously introduced into the suspension through the gas pipe 3 to make t...

Example Embodiment

[0066] Example 2:

[0067] The difference between this embodiment and the method of embodiment 1 is that in step (4), the mass ratio of the suspension to the activator is 1:0.0002, and after the activator is added, the required reaction time is 3 hours.

[0068] The index of the obtained product is: Mn: 70.8%-71.2%, low impurity content, among which Na-containing impurities are 0.002% calculated as sodium oxide mass fraction, and specific surface area: 75-82m 2 / g.

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Abstract

The invention discloses a preparation method for high-activity trimanganese tetraoxide. The preparation method comprises the following steps: S1, mixing electrolytic manganese metal powder with a catalyst, carrying out wetting to form slurry, adding the slurry into warm deionized water to form a suspension, continuously introducing oxygen or pure air, and carrying out a stirring reaction; S2, starting an ultrasonic generator for treatment, adding a activator, and carrying out a reaction for 1.8-5 h to obtain the suspension slurry of high-activity trimanganese tetraoxide, wherein ultrasonic intensity is adjusted within the range of 20 kHz-40 kHz during the reaction; and S3, performing concentration, washing, dehydrating and drying to obtain the high-activity trimanganese tetraoxide. The method of the invention has the advantages of short production cycle, low cost, small environmental pollution and good safety, and can prepare high-activity trimanganese tetraoxide.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, in particular to a preparation method of highly active trimanganese tetraoxide. Background technique [0002] Trimanganese tetraoxide (Mn 3 o 4 ) is a brown-red powder, which is relatively stable at normal temperature and pressure. It is an important raw material for the production of soft magnetic manganese-zinc ferrite. It can also be used to produce magnetic cores, transformers, inductors, etc. depending on the purity. With the continuous development of electronic products, there are more and more applications of highly active trimanganese tetraoxide in high-performance magnetic materials and functional materials. [0003] The preparation methods of trimanganese tetraoxide mainly include reduction method, roasting method and suspension oxidation method. At present, the most commonly used method in China is the suspension oxidation method. The raw material is electrolytic manganes...

Claims

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Application Information

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IPC IPC(8): C01G45/02B22F9/04
CPCC01G45/02B22F9/04C01P2006/12
Inventor 许定胜伍宏斌张宏祖国红王慧兰刘革建谢戈杨学燕
Owner HUNAN SPECIAL METAL MATERIALS CO LTD
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