氧化-离心法提纯微晶石墨及其机理

doi:10.11896/j.issn.1005-023X.2018.12.021

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Abstract The centrifugal separation and purification of microcrystalline graphite was carried out by using modified Hummers method with Hunan Chenzhou natural microcrystalline graphite as raw material. The result revealed that the oxygen-containing functional groups are bonded to the structure, the interlayer space are increased, the microcrystalline graphite aggregates become loose and the aggregates are partially dissociated after oxidizing, the particle size decreases gradually with the increase of the oxidation degree. After washing, the impurity can be separated from the microcrystalline oxidized graphite, and the graphite with high purity is obtained. Through the analysis of the structure and composition of the product, it shows that the oxidation plays a key role in the purification process. The oxidation has a chemical dissociation effect on the aggregates. The higher the oxidation degree is, the more obvious the dissociation effect is. When the mass ratio of microcrystalline graphite to KMnO₄ is 1∶4, the best purification effect can be achieved. After purification, fixed carbon is 98.8%, volatile content is 0.2%, the ash content is only 1%, and the aggregates are completely dissociated, the diameter of the slices was 1—2 μm.

Key words： microcrystalline graphite oxidation centrifuge purification

Published: 20 July 2018

CLC number:	TD925
	O613.71

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	Articles by authors
	ZHANG Dong
	SUN Hongjuan
	PENG Tongjiang
	LIU Bo

Cite this article:

ZHANG Dong,SUN Hongjuan,PENG Tongjiang, et al. Purification of Natural Microcrystalline Graphite by Oxidation Centrifugal Method and Its Mechanism[J]. Materials Reports, 2018, 32(12): 2051-2056.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.12.021 OR http://www.mater-rep.com/EN/Y2018/V32/I12/2051

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