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Method for preparing trimanganese tetroxide by using manganese sulfate solution

A technology of trimanganese tetraoxide and manganese sulfate solution, applied in the direction of manganese oxide/manganese hydroxide, etc., can solve the problems of small specific surface area, uneasy control of reaction conditions, low conversion rate of trimanganese tetraoxide, etc., and achieve large specific surface area, The effect of low production cost and easy operation

Inactive Publication Date: 2011-01-19
CHONGQING UNIV
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Problems solved by technology

However, in these existing methods, some reaction conditions are not easy to control, and many manganese dioxide (MnO 2 ) and manganese trioxide (Mn 2 o 3 ), so that the transformation rate of trimanganese tetraoxide that people want to obtain is not high; Some specific surface area is less; Higher requirements

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  • Method for preparing trimanganese tetroxide by using manganese sulfate solution

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Embodiment Construction

[0015] A method for preparing trimanganese tetraoxide with manganese sulfate solution, the steps are as follows:

[0016] ① Add alkaline substances to the manganese sulfate solution to adjust the pH value to convert the manganese sulfate solution into manganese hydroxide solution; specifically: select pure manganese sulfate solution, use ammonia water, liquid ammonia, sodium hydroxide and hydroxide One of the potassium, adjust its pH value to between 10 and 12. Obviously, the specific pH value should be such that the Mn in the original manganese sulfate solution 2+ All precipitated as manganese hydroxide [Mn(OH) 2 ] is the degree. Usually, the manganese hydroxide obtained by precipitation with these alkaline substances is relatively stable and has high purity, which is also helpful to increase the yield.

[0017] 2. the manganese hydroxide in step 1. gained solution is oxidized trimanganese tetraoxide;

[0018] ③ filter, wash with distilled water, and dry the sample at 105°...

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Abstract

The invention discloses a method for preparing trimanganese tetroxide by using manganese sulfate solution. The method comprises the following steps of: regulating the pH value of the manganese sulfate solution by using an alkali substance to convert the manganese sulfate solution into manganese hydrate solution; and adding ion liquid into the solution, performing microwave auxiliary heating in a state of exposing in the air, oxidizing manganese hydrate into the trimanganese tetroxide, and filtering, washing and drying the trimanganese tetroxide to obtain brown red trimanganese tetroxide solid. The method has the advantages of high conversion rate (the lowest conversion rate is not less than 60.45 percent) of the trimanganese tetroxide and large specific surface area (the largest specific surface area can reach 187m<2> / g). The invention also has the advantages of low production cost, easy operation and convenience for realizing industrialized production.

Description

technical field [0001] The invention relates to a method for preparing trimanganese tetraoxide with manganese sulfate solution. Background technique [0002] Trimanganese tetraoxide (Mn 3 o 4 ) is one of the important raw materials for preparing the soft magnetic material of manganese zinc ferrite. Since the soft magnetic material is widely used in the electronics industry, it is already possible to prepare high-quality trimanganese tetroxide (for example, with a large specific surface area) It is listed as a high-tech industrialization project that is currently prioritized by the State Development Planning Commission and the Ministry of Science and Technology, and is a high-tech product that the country encourages and prioritizes. [0003] The method for preparing trimanganese tetroxide, a kind of method that develops faster at present is the manganese sulfate method, promptly in manganese sulfate (MnSO 4 ) solution is added with alkaline substances, first manganese sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02
Inventor 陶长元沙继文刘作华杜军范兴周小霞李东海刘仁龙孙大贵左赵宏陈燕李敏
Owner CHONGQING UNIV
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