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Production process of trimanganese tetroxide with carbon-manganese alloy

A technology of trimanganese tetraoxide and carbon-manganese alloy, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of high impurity content, incomplete removal of impurities, and small specific surface area of ​​trimanganese tetraoxide products, and achieve convenient operation, The effect of narrow particle size distribution and small particles

Inactive Publication Date: 2009-05-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Advantages of this process: high output, simple process; disadvantages: high impurity content, small specific surface area, wide particle size distribution, basically produce ordinary grade high selenium micron manganese tetraoxide
Unable to compete with selenium-free high specific surface area manganese tetraoxide produced in foreign countries such as the United States, Japan and South Africa
[0004] It is a feasible method to produce trimanganese tetroxide by leaching and chemically removing impurities from primary manganese ore, but the method is not thorough in removing impurities, and the final impurity content of trimanganese tetraoxide product is higher than that of electrolytic manganese metal powder suspension Products Produced by Oxidation Process

Method used

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  • Production process of trimanganese tetroxide with carbon-manganese alloy
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Experimental program
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Effect test

Embodiment 1

[0017] In the first step, 740 grams of electrolytic manganese and 60 grams of graphite are melted in an induction furnace in the air. After the furnace material is melted, it is poured into an ingot mold and cooled to obtain a brittle carbon-manganese alloy. According to X-ray diffraction analysis, the main phase is carbonization. Manganese Mn 5 C 2 carbon-manganese alloy.

[0018] In the second step, put 50 grams of carbon-manganese alloy with a particle size of less than 2 mm into 250 ml of water (at room temperature), and bubbles will appear immediately, accompanied by a small amount of reaction heat. After 25 hours of reaction, the carbon-manganese alloy becomes ultrafine milky white The powder precipitates at the bottom of the container. According to X-ray diffraction analysis, the ultrafine milky white powder is mainly manganese hydroxide Mn(OH) 2 , and a small amount of manganese tetraoxide Mn 3 o 4 .

[0019] The third step is to oxidize the ultrafine milky white ...

Embodiment 2

[0022] In the first step, 920 grams of electrolytic manganese and 80 grams of graphite are melted in an induction furnace in the air. After the furnace material is melted, it is poured into an ingot mold and cooled to obtain a brittle carbon-manganese alloy. According to X-ray diffraction analysis, the main phase is carbonization. Manganese Mn 5 C 2 carbon-manganese alloy.

[0023] In the second step, put 10 grams of carbon-manganese alloy with a particle size of less than 2mm into 50ml of water (at room temperature), and bubbles will appear immediately, accompanied by a small amount of reaction heat. After 20 hours of reaction, the carbon-manganese alloy becomes ultrafine milky white The powder precipitates at the bottom of the container. According to X-ray diffraction analysis, the ultrafine milky white powder is mainly manganese hydroxide Mn(OH) 2 , and a small amount of manganese tetraoxide Mn 3 o 4 .

[0024] The third step is to oxidize the ultrafine milky white pow...

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Abstract

The invention relates to a method for preparing trimanganese tetroxide from a carbon-manganese alloy, belonging to the technical field of functional materials. The method comprises the following steps: melting 91% to 94.5% (mass percentage) of electrolytic manganese and 5.5% to 9% (mass percentage) of graphite by an induction furnace in the air, pouring the melted furnace burden in an ingot mold and cooling to obtain the carbon-manganese alloy; then, reacting in the water for 15 to 30 hours to obtain the superfine milk white manganese hydroxide powder; and oxidizing the superfine powder at the room temperature in the air to obtain the superfine brown trimanganese tetroxide. The method has the advantages of simple process, convenient operation, mass production and easily controlled reaction process, compared with the electrolytic manganese metal powder suspension oxidation process and the manganese ore chemical leaching process for preparing trimanganese tetroxide, the method of the invention is really a green manufacturing technique; the granules of the prepared trimanganese tetroxide product are small and spherical; and the grain size distribution is narrow.

Description

technical field [0001] The invention relates to a method for producing trimanganese tetraoxide by carbon-manganese alloy, which belongs to the technical field of functional materials. Background technique [0002] Trimanganese tetraoxide Mn 3 o 4 It is an important raw material for the production of manganese-zinc ferrite. Manganese-zinc ferrite has the characteristics of narrow remanence induction curve, repeated magnetization, high DC resistivity, and avoiding more eddy current losses. It is widely used in electronics, electrical appliances, and electric power. And high-tech and other fields; Nano trimanganese tetraoxide can be used as a cheap catalyst; Recently it has been found that trimanganese tetraoxide can also be used to prepare lithium ion positive electrode materials LiMn 2 o 4 , which outperforms MnO 2 . [0003] To produce high-quality manganese-zinc ferrite, the quality of manganese tetraoxide should be raised to a higher level, and the particle size is an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 倪建森丁伟中
Owner SHANGHAI UNIV