煤系高岭土中残留炭的分离回收与材料化利用研究

doi:10.11896/cldb.20020080

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Abstract Separation and recovery of residual carbon from coal-series kaolinite is an important prerequisite for its high value comprehensive utilization. In this paper, the residual carbon was separated and recovered from Inner Mongolia coal-series kaolinite by reverse flotation technology. The separation and recovery effect of residual carbon under the condition of multi-stage reverse flotation was explored. Moreover, porous carbons applied as electrode materials for supercapacitors were prepared from residual carbon via NaOH or KOH activation. The microstructure of porous carbon and the electrochemical performance porous carbon electrode were characterized by N₂ adsorption/desorption, scanning electron microscope, galvanostatic charge/discharge and cyclic voltammetry. The results show that residual carbon can be effectively separated and recovered from coal-series kaolinite through “roughing - two step cleaning-scavenging” reverse flotation technology, and its recovery was 85.22%. High-performance porous carbons with specific surface area of 2 079 m²/g and 2 324 m²/g, total pore volume of 1.167 cm³/g and 1.328 cm³/g were prepared by NaOH and KOH activation, respectively. These porous carbons exhibited interconnected “macropore-mesopore-micropore” pore size distribution and superior adsorption performance, their iodine adsorption value reached 2 205 mg/g and 2 491 mg/g, methylene blue adsorption value reached 322 mg/g and 406 mg/g. The two kinds of porous carbon electrode materials for supercapacitor exhibited an excellent electroche-mical performance. The specific capacitances were as high as 256 F/g and 285 F/g and exhibited good high current charge-discharge characte-ristics as well as excellent cycling performance, and its initial specific capacitance were retained more than 90% after 1 500 cycles.

Key words： coal-series kaolinite residual carbon flotation separation porous carbon electrode materials

Published: 24 December 2020

CLC number:	TD98
	TQ424.1

Fund:This work was financially supported by the Tiandi Science and Technology Co., Ltd. Science and Technology Innovation Venture Capital Special Project (2018-TD-ZD012).

About author:: Bingsheng Hu received his bachelor′s degree in June 2005 from Anhui University of Science & Technology. He is currently a senior engineer in CCETG Tangshan Research Institute and participates in the development of dry separation equipment and technology. His research interests are dry coal preparation, construction waste sorting and separation of nonmetallic minerals.

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	Articles by authors
	HU Bingsheng
	WANG Hong
	SONG Junchao
	WEI Liang
	YUE Shisong
	JIA Jinxin
	SHI Changliang
	YANG Lei

Cite this article:

HU Bingsheng,WANG Hong,SONG Junchao, et al. Separation and Recovery of Residual Carbon from Coal-derived Kaolinite and Its Materialization Utilization[J]. Materials Reports, 2020, 34(24): 24068-24073.

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http://www.mater-rep.com/EN/10.11896/cldb.20020080 OR http://www.mater-rep.com/EN/Y2020/V34/I24/24068

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