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Preparation method of high-purity manganese monoxide

A manganese monoxide, high-purity technology, applied in the direction of manganese oxide/manganese hydroxide, electrochemical generators, electrical components, etc., can solve the problem that the impurity content is difficult to meet the requirements of high-purity manganese monoxide, and it is difficult to prepare high-purity mono Manganese oxide, high cost of use, etc., to achieve remarkable impurity removal effect, low raw material cost, and low production cost

Inactive Publication Date: 2017-05-10
CENT SOUTH UNIV
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Problems solved by technology

Whether it is electrolytic manganese dioxide or chemical manganese dioxide, its impurity content is difficult to meet the requirements of high-purity manganese monoxide; if manganese carbonate is heated to prepare manganese monoxide under air-isolated conditions, the purity of manganese carbonate is required to be very high, but The existing manganese carbonate impurity content is also relatively high, and the use cost is relatively high
Therefore, the existing method is difficult to prepare high-purity manganese monoxide

Method used

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  • Preparation method of high-purity manganese monoxide

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preparation example Construction

[0028] refer to figure 1 , a preparation method of high-purity manganese monoxide, comprising the following steps:

[0029] (1) Crushing electrolytic manganese metal flakes to obtain manganese particles, the particle size of which is less than 3 mm;

[0030] (2) placing the manganese particles in an atmosphere furnace;

[0031] (3) Pass oxidizing gas into the atmosphere furnace to drive out the air in the furnace;

[0032] (4) heating up the atmosphere furnace;

[0033] (5) When the temperature of the atmosphere furnace reaches 700°C to 750°C, enter the constant temperature roasting stage, and constant temperature roasting for a period of time;

[0034] (6) After the constant temperature roasting is completed, the reducing gas is introduced to cool the material naturally in the furnace;

[0035] (7) When the temperature of the material in the furnace is lowered, the material is taken out from the furnace;

[0036] (8) Grinding the material obtained in step (7) to obtain h...

Embodiment 1

[0038] The electrolytic manganese metal flakes are crushed to a particle size of 15 μm to obtain manganese particles; the obtained manganese particles are placed in a sagger, and then pushed into the atmosphere furnace with the sagger; carbon dioxide gas is introduced into the atmosphere furnace, Drive out the air in the atmosphere furnace, then raise the temperature of the atmosphere furnace at a rate of 5°C / min. When the temperature of the atmosphere furnace reaches 700° C. to 750° C., it enters the constant temperature roasting stage, and the constant temperature roasting is carried out for 2 hours. After the constant temperature roasting is finished, hydrogen gas is introduced, and the material is naturally cooled in the furnace, and the cooling time is 5 hours. When the temperature of the material in the furnace drops below 80°C, the sagger is taken out from the furnace, and then the material in the sagger is ground, and high-purity manganese monoxide can be obtained afte...

Embodiment 2

[0040] The electrolytic manganese metal flakes are crushed to a particle size of 14 μm to obtain manganese particles; the obtained manganese particles are placed in a sagger, and then pushed into the atmosphere furnace with the sagger; carbon dioxide gas is introduced into the atmosphere furnace, Drive out the air in the atmosphere furnace, then raise the temperature of the atmosphere furnace at a rate of 5°C / min. When the temperature of the atmosphere furnace reaches 700°C to 750°C, it enters the constant temperature roasting stage, and the constant temperature roasting is carried out for 2.5 hours. After the constant temperature roasting is finished, hydrogen gas is introduced, and the material is naturally cooled in the furnace, and the cooling time is 5.5 hours. When the temperature of the material in the furnace drops below 80°C, the sagger is taken out from the furnace, and then the material in the sagger is ground, and high-purity manganese monoxide can be obtained afte...

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Abstract

The invention relates to a preparation method of high-purity manganese monoxide. The preparation method comprises the following steps: smashing electrolytic manganese metal into pieces to obtain manganese particles; putting the manganese particles into an atmosphere furnace; introducing oxidizing gas into the atmosphere furnace, and expelling air in the furnace; warming the atmosphere furnace; when the temperature of the atmosphere furnace reaches 700 to 750 DEG C, proceeding into a constant-temperature calcining stage, and keeping constant-temperature calcination for a period of time; after the constant-temperature calcination is ended, introducing reducing gas, and carrying out natural cooling on material in the furnace; after the temperature of the material in the furnace is reduced, taking the material out of the furnace; and grinding the obtained material to obtain the high-purity manganese monoxide. The preparation method is simple in preparation technology, easy to operate, low in raw material cost and sufficient in raw materials; and the technology is low in production cost, and is easy to realize industrial scale production. The manganese monoxide prepared in the invention is high in purity, and the chemical composition and physical performance of the manganese monoxide can meet the requirement for chemical composition and physical performance of lithium ion battery material lithium manganate.

Description

technical field [0001] The invention relates to the field of preparation of manganese series products, in particular to a preparation method of high-purity manganese monoxide. Background technique [0002] my country's manganese ore reserves are 710 million tons, ranking fourth in the world. In modern industry, manganese and its compounds are used in various fields of the national economy. Among them, for the demand for manganese ore, the amount of manganese used in the iron and steel industry accounts for 90% to 95%, and ferroalloy needs to use manganese ore as a raw material. The remaining 5% to 10% of manganese is used in other industrial fields, such as chemical industry, light industry, building materials industry, national defense industry, electronics industry and so on. [0003] Manganese monoxide, also known as manganese oxide, is an important type of manganese compounds, mainly used as raw materials for the production of iron oxides, desiccants for paints and varn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/50H01M4/505H01M4/1391H01M10/0525C01G45/02
CPCC01G45/02H01M4/1391H01M4/502H01M4/505H01M10/0525Y02E60/10
Inventor 袁明亮闫冠杰卢道焕
Owner CENT SOUTH UNIV
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