Isaac Scientific Publishing

Current Works in Mineral Processing

Enhancement in Selectivity of Coking Coal Flotation by Ultrasound Simultaneous Treatment

Download PDF (1541.1 KB) PP. 1 - 9 Pub. Date: March 31, 2020

DOI: 10.22606/cwimp.2020.21001

Author(s)

  • Yijiang Li
    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
  • Wencheng Xia*
    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
  • Yuqiang Mao
    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
  • Guangxi Ma
    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
  • Yaoli Peng
    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
  • Guangyuan Xie
    School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
  • Yanfeng Li
    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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