Roasting process of preparing high-purity mangano-manganic oxide

A technology of manganese tetraoxide and its manufacturing method, which is applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of unsatisfactory quality, large investment in equipment, high production cost, etc., and achieve a steep magnetization curve, low investment, and simple production equipment Effect

Inactive Publication Date: 2002-05-01
段希圣
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Problems solved by technology

The current domestic industrial production of high-purity manganese tetroxide almost all adopts the oxidation method, that is, the expensive electrolytic manganese powder is used as the raw material, and the ammonium salt is used as the additive. After the reaction is completed, brown grains are obtained by filtering, washing and drying. The gamma-type manganese tetraoxide, this method requires large equipment investment, high production cost, and also contains a certain amount of water content, sulfur content and ignition loss. It is easy to absorb oxygen in the air and is oxidized. It is used in areas with humid air. and storage are easy to agglomerate; for example, the brown trimanganese tetroxide produced by a certain factory in Taiwan Yuefeng has deteriorated due to moisture absorption and agglomeration
Moreover, the grain structure of brown trimanganese tetraoxide is loose, and the quality of the magnetic core made from it is not ideal.

Method used

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with specific embodiments.

[0012] The manganese sulfate and ammonium bicarbonate after impurity removal are mixed and reacted in the solution, and the temperature is controlled at 20-60°C to obtain manganese carbonate precipitation. The chemical reaction formula is as follows: Manganese sulfate Ammonium bicarbonate Ammonium sulfate Manganese carbonate

[0013] After the manganese carbonate precipitate is separated from the solution, it is heated and decomposed at 80-150°C to obtain manganese monoxide of face-centered cuboid, and its chemical reaction formula is as follows:

[0014] Manganese monoxide is oxidized to manganese dioxide with a cubic structure when heated to 150-500°C under aerobic conditions, and its chemical reaction formula is as follows:

[0015] Manganese dioxide is reduced to body-centered cubic structure - manganese trioxide in the absence of oxygen and at a temperature...

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Abstract

By using manganese sulfate and ammonium bicarbonate as material and through the technological processes of the reaction of manganese sulfate and ammonium bicarbonate to produce manganese carbonate, the successive conversion of manganese carbonate into manganese monoxide of face-centered cubic structure and manganese dioxide of tetragonal structure, the reduction of manganese dioxide into bimanganese trioxide and beta-mangano-manganic oxide successively of tetragonal, and final obtaining gamma-mangano-manganic oxide of face-centered cubic structure with large specific weight and being not easy to absorb moisture and to oxidize.

Description

Field of invention: [0001] The invention relates to a roasting and manufacturing method of high-purity manganese tetraoxide. Background technique: [0002] Trimanganese tetroxide is one of the important raw materials for the production of soft ferrite in the electronics industry. In order to ensure the quality of the soft ferrite core, it is required that the manganese tetraoxide used has high purity, large specific surface area and good activity. In the prior art, there are four types of methods for producing high-purity manganese tetraoxide: roasting, oxidation, reduction and electrolysis. The production of high-purity manganese tetraoxide by roasting, reduction and electrolysis is still in the stage of experimental preparation. The current domestic industrial production of high-purity manganese tetroxide almost all adopts the oxidation method, that is, the expensive electrolytic manganese powder is used as the raw material, and the ammonium salt is used as the additive....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
Inventor 段希圣
Owner 段希圣
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