Separation and Recovery of Residual Carbon from Coal-derived Kaolinite and Its Materialization Utilization
HU Bingsheng1,2, WANG Hong1,2, SONG Junchao1,2, WEI Liang1,2, YUE Shisong1,2, JIA Jinxin1,2, SHI Changliang3, YANG Lei3
1 Tangshan Research Institute Co., Ltd., China Coal Technology ＆ Engineering Group, Tangshan 063000, China 2 Hebei Province Coal Washing ＆ Engineering Technology Research Center, Tangshan 063000, China 3 College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
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.
胡丙升, 王宏, 宋俊超, 魏亮, 岳世松, 贾金鑫, 史长亮, 杨蕾. 煤系高岭土中残留炭的分离回收与材料化利用研究[J]. 材料导报, 2020, 34(24): 24068-24073.
HU Bingsheng, WANG Hong, SONG Junchao, WEI Liang, YUE Shisong, JIA Jinxin, SHI Changliang, YANG Lei. Separation and Recovery of Residual Carbon from Coal-derived Kaolinite and Its Materialization Utilization. Materials Reports, 2020, 34(24): 24068-24073.
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2020, Vol. 34 
