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Process intensification of fine coal separation using two-stage flotation column

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Abstract

Flotation column is widely used as the separation equipment for fine mineral due to its high selectivity. However, this device may be unsuitable for the coarse particle flotation and has high handling ability. A two-stage flotation column with dimensions of 2 000 mm×1 000 mm×4 000 mm was designed to enhance the column flotation process. The energy input was modified by adjusting the flow rate and the head of circulating pump. The flotation column was designed with low energy input in the first stage (speed flotation stage) to recover easy-to-float materials quickly, and high energy input in the second stage (recovery stage) to recover difficult-to-float minerals compulsorily. Contrast experiments on the throughput and coarse coal recovery of high ash coal from the Kailuan Mine were conducted using conventional single-stage flotation column and the two-stage flotation column. The results show that the combustible matter recovery of the two-stage flotation column is 5.25% higher than that of the conventional single-stage flotation column. However, the ash contents of clean coal for both columns are similar. Less coarse coals with low ash are obtained using the two-stage flotation column than that using the single-stage column flotation with the same handling ability. The two-stage flotation column process can enhance coal flotation compared with the conventional single-stage column flotation.

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Authors and Affiliations

  1. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou, 221116, China

    Xia-hui Gui  (桂夏辉)

  2. Chinese National Engineering Research Center of Coal Preparation and Purification, Xuzhou, 221116, China

    Jiong-tian Liu  (刘炯天), Yi-jun Cao  (曹亦俊), Hai-jun Zhang  (张海军) & Yong-tian Wang  (王永田)

  3. School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, China

    Gan Cheng  (程敢)

Authors
  1. Xia-hui Gui  (桂夏辉)
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  2. Jiong-tian Liu  (刘炯天)
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  3. Yi-jun Cao  (曹亦俊)
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  4. Gan Cheng  (程敢)
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  5. Hai-jun Zhang  (张海军)
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  6. Yong-tian Wang  (王永田)
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Corresponding author

Correspondence to Xia-hui Gui  (桂夏辉).

Additional information

Foundation item: Project(2012CB214905) supported by the National Basic Research Program of China; Project(51074157) supported by the National Natural Science Foundation of China

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Gui, Xh., Liu, Jt., Cao, Yj. et al. Process intensification of fine coal separation using two-stage flotation column. J. Cent. South Univ. 20, 3648–3659 (2013). https://doi.org/10.1007/s11771-013-1892-1

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  • DOI: https://doi.org/10.1007/s11771-013-1892-1

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