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Current Works in Mineral Processing
CWiMP > Volume 2, Number 1, March 2020

Enhancement in Selectivity of Coking Coal Flotation by Ultrasound Simultaneous Treatment

Download PDF  (1541.1 KB)PP. 1-9,  Pub. Date:April 23, 2020
DOI: 10.22606/cwimp.2020.21001

Author(s)
Yijiang Li, Wencheng Xia, Yuqiang Mao, Guangxi Ma, Yaoli Peng, Guangyuan Xie, Yanfeng Li
Affiliation(s)
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
Abstract
The influence of ultrasound simultaneous treatment on coking coal flotation were investigated by adding ultrasound to the pulp zone. The flotation results showed ultrasound simultaneous flotation (USF) produced the clean coal of lower ash content compared with conventional flotation (CF). Moreover, the combustible recovery rate of USF was higher than that of CF. Scanning electron microscope found that the ultrasound could reduce the high-ash fine slime coated on coal surface. Particle size distribution results showed the ultrasound simultaneous treatment increased the recovery of coarse coal. The coal surface oxidation was found by the X-ray photoelectron spectroscopy of coal surface with/without ultrasound treatment. The negative impact of ultrasound on the surface oxidation was much less than the positive effect of ultrasound on reducing the slime coating on coal surface and increasing the aggregates of the bubbles. It is concluded that USF of coking coal has a higher selectivity than CF.
Keywords
coal flotation; ultrasound; selectivity; scanning electron microscope; X-ray photoelectron spectroscopy.
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