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Trimanganese tetraoxide, as well as preparation method and application thereof

A technology of trimanganese tetraoxide and manganese sulfate solution, which is applied in the direction of manganese oxide/manganese hydroxide, electrochemical generators, structural parts, etc., and can solve the problem of small particle size, irregular particle shape and uneven particle distribution of trimanganese tetraoxide and other problems, to achieve the effect of uniform particle size distribution, high tap density and short process flow

Active Publication Date: 2016-09-21
HUNAN MENGDA NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the Chinese patent document with the publication number CN1927727A discloses a method for producing high-purity manganese tetraoxide by high-temperature pyrolysis of manganese sulfate, dissolving industrial manganese sulfate, removing impurities, filtering, primary crystallization, secondary crystallization, drying, and heating High-purity trimanganese tetraoxide is produced by crystallization water and high-temperature pyrolysis, but the particle size of trimanganese tetraoxide prepared by this method is small, the particle shape is irregular, the particle distribution is uneven, the specific surface area is large, and the tap density is low; Suitable for battery cathode materials

Method used

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  • Trimanganese tetraoxide, as well as preparation method and application thereof
  • Trimanganese tetraoxide, as well as preparation method and application thereof
  • Trimanganese tetraoxide, as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Prepare 5L of manganese sulfate saturated solution (a saturated aqueous solution of manganese sulfate; in this saturated solution, the concentration of manganese sulfate is 393g / L, and the pH is 5.0-6.0), add 5g of Na2S to remove impurities, filter, then add 5g of ascorbic acid to the filtrate to dissolve . Use the feeding pump to add to the disc granulator, turn on and adjust the frequency of the motor, so that the disc rotates at a speed of 15r / min, and at the same time turn on the microwave heating to gradually heat the temperature of the disc to 950°C at 10°C / min and keep it warm 1h, the gas decomposed in the reaction process enters the collection device through the guide tube to prepare dilute sulfuric acid. After the reaction is completed, it is naturally cooled to room temperature. About 16μm spherical trimanganese tetraoxide.

[0041] figure 1 It is the XRD figure of the obtained trimanganese tetraoxide; As can be seen from the figure, all the characteristic p...

Embodiment 2

[0044] Prepare 5L of manganese sulfate saturated solution (a saturated aqueous solution of manganese sulfate; in this saturated solution, the concentration of manganese sulfate is 393g / L, and the pH is 5.0-6.0), add 4g of Na2S to remove impurities, filter, then add 3g of ascorbic acid to the filtrate to dissolve . Use the feeding pump to add to the disc granulator, turn on and adjust the frequency of the motor, so that the disc rotates at a speed of 10r / min, and at the same time turn on the microwave heating to gradually heat the temperature of the disc to 1100°C at 20°C / min and keep it warm After 30 minutes, the gas decomposed in the reaction process enters the collection device through the guide tube to prepare dilute sulfuric acid. After the reaction is completed, it is naturally cooled to room temperature, and the trimanganese tetraoxide obtained by the reaction is repeatedly washed and dried to obtain trimanganese tetraoxide; figure 2 This is the SEM image of the obtaine...

Embodiment 3

[0047] Prepare 5L of manganese sulfate saturated solution (a saturated aqueous solution of manganese sulfate; in this saturated solution, the concentration of manganese sulfate is 393g / L, and the pH is 5.0-6.0), add 8g of Na2S to remove impurities, filter, then add 3g of ascorbic acid to the filtrate to dissolve . Use the feeding pump to add to the disc granulator, turn on and adjust the frequency of the motor, so that the disc rotates at a speed of 15r / min, and at the same time turn on the microwave heating to gradually heat the temperature of the disc to 950°C at 10°C / min and keep it warm 1h, the gas generated by decomposition during the reaction enters the collection device through the guide tube to prepare dilute sulfuric acid. After the reaction is completed, it is naturally cooled to room temperature, and the trimanganese tetraoxide obtained by the reaction is repeatedly washed and dried to obtain spherical trimanganese tetraoxide. Using a specific gravity meter to detec...

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Abstract

The invention discloses a preparation method for trimanganese tetraoxide. The preparation method comprises the following steps: pumping a manganese sulfate solution into a disc granulator, performing crystallization decomposition and rotary granulation under radiation of microwave irradiation, and washing and drying granules obtained by granulation to obtain the trimanganese tetraoxide, wherein the temperature of the microwave irradiation is 900 to 1,200 DEG C; the rotating speed of a disc of the disc granulator is 10 to 30r / min. In addition, the invention further discloses application of the trimanganese tetraoxide prepared by the preparation method to preparation of a cathode material. According to the preparation method and the application, crystallization and granulation are performed under the synergistic action of a rotating parameter of the disc granulator and the microwave radiation, so that preparation of the trimanganese tetraoxide with high purity, large specific gravity and uniform granularity distribution is facilitated, and problems about treatment of ammonium salt wastewater produced by an existing universal process of preparing trimanganese tetraoxide by virtue of a wet manganese sulfate oxidization method are solved; the method is short in process flow, easy to control and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a manganese oxide and a preparation method thereof. Background technique [0002] In response to a series of problems such as energy crisis, environmental pollution, and global warming, governments of various countries have invested a lot of manpower and material resources to develop and utilize renewable green energy such as solar energy, wind energy, and tidal energy. However, these green energy sources are uncertain in time and space. , therefore, the development of cheap and environmentally friendly energy storage technology is the key technology to utilize these energy sources. Lithium-ion batteries have the advantages of small size, high voltage, large capacity, long life, small self-discharge, no memory effect, and environmental protection, and are recognized by the international community as the most ideal chemical energy for energy storage and conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02H01M4/505H01M4/1391H01M10/0525
CPCC01G45/02H01M4/1391H01M4/505H01M10/0525Y02E60/10
Inventor 朱敏刘方予余林玉
Owner HUNAN MENGDA NEW ENERGY MATERIALS CO LTD
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