Advance Search
LIU Min, ZHANG Youfei, GUO Fangyu, LUO Jiaqian, DING Shihao, CAO Yijun, XING Yaowen, GUI Xiahui. Effect of surface roughness on floatability of coal slime[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (10).
Citation: LIU Min, ZHANG Youfei, GUO Fangyu, LUO Jiaqian, DING Shihao, CAO Yijun, XING Yaowen, GUI Xiahui. Effect of surface roughness on floatability of coal slime[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (10).

Effect of surface roughness on floatability of coal slime

More Information
  • Available Online: April 02, 2023
  • Published Date: October 24, 2019
  • In order to figure out the influence of surface roughness on the floatability of coal, a series of roughness coal pieces were prepared by using a grinding and polishing machine, and the contact angle measuring instrument and the adhesion measuring instrument were respectively used to test the change of contact angle,the induction time and the maximum adhesion force between coal and water droplets of the surface of the coal samples. Finally, the effect mechanism of roughness on the floatability of coal was explained by the Wenzel wetting model. The results show that as the surface roughness of the coal sample decreases, the surface contact angle will gradually increase. From the original sample to three different smooth coal samples, the contact angles are 64.2°,70.4°,77.0° and 91.7°.According to the Wenzel wetting model, the groove structure of the rough coal surface is filled with water, the actual contact area between water and coal increases, and the apparent contact angle decreases. The induction time and coal-water the maximum adhesion force gradually show a decreasing trend with the increase of roughness, indicating that the increase of surface roughness will reduce the floatability of coal. Rough coal particles are difficult to be captured by bubbles during flotation. For this reason, it is recommended to use high-intensity pulping equipment to treat the slime, reduce the surface roughness of the coal particles, enhance the floatability of the coal, and improve the flotation efficiency.
  • Related Articles

    [1]WU Ligang, CHEN Le, LYU Yuanyuan, ZHANG Zhe. A lightweight-based method for real-time monitoring of lump coal on conveyor belts[J]. COAL SCIENCE AND TECHNOLOGY, 2023, 51(S2): 285-293. DOI: 10.12438/cst.2023-1217
    [2]QIAO Siyu, YANG Zefa, LI Zhiwei, ZHU Xiaojun, NIU Jingjing, QIAN Yuyang. Optimal selection of time functions for describing coal mining-induced dynamic subsidence at single surface point using AIC criterion[J]. COAL SCIENCE AND TECHNOLOGY, 2023, 51(6): 177-186. DOI: 10.13199/j.cnki.cst.2022-0047
    [3]ZHANG Jian, XU Bo, WEI Jianping, ZHANG Pengyan, CAI Maolin, ZHANG Kaixuan. Numerical simulation of coal surface contact angle based on roughness[J]. COAL SCIENCE AND TECHNOLOGY, 2023, 51(4): 96-104. DOI: 10.13199/j.cnki.cst.2021-0871
    [4]ZHAO Guojun GUO Hongyu LYU Jinghui YU Hongfei YIN Xiangju, . Comparison on promotion effect of different microbial pretreatments on conversion of coal to biogas[J]. COAL SCIENCE AND TECHNOLOGY, 2020, 48(12).
    [5]PING An, WANG Mengdie, NIU Chenkai, XIA Wencheng, PENG Yaoli, XIE Guangyuan. Effect of surfactant on dewatering of flotation clean coal and its mechanism[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (11).
    [6]YANG Jianghao, LI Yong, WU Xiang, WU Peng, HAN Wenlong, ZHAO Shihu. Study on micro-scale mechanical properties of coal rock basedon atomic force microscopy[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (9).
    [7]LIU Yucheng. Study on time series fitting curves for coal mining-induced surface subsidence[J]. COAL SCIENCE AND TECHNOLOGY, 2019, (5).
    [8]ZHANG Ying. Research of anti-freezing adhesive spray technology ofcoal belt conveying system in freezing cold area[J]. COAL SCIENCE AND TECHNOLOGY, 2018, (1).
    [9]Effects of Clay Minerals on the Surface Properties of Coal Slime[J]. COAL SCIENCE AND TECHNOLOGY, 2013, (7).
    [10]Raw Coal Density Affected to Surface Zeta Potential of Muddy and Slime Particle[J]. COAL SCIENCE AND TECHNOLOGY, 2011, (6).

Catalog

    Article views (558) PDF downloads (350) Cited by()
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return