Coal Desliming Using Annular Rinse Water Hydrocyclone

Abstract:

The separation of fine coal can be improved by pre-desliming, which was significantly enhanced when fine coal was processed using a Falcon concentrator, and <45-μm coal slime was removed. Ultrafine classification tests using Krebs classification cyclone with annular rinse water showed that the increase in feeding concentration negatively affected the efficiency of classification while increasing the classification size because the settling was hindered by the high underflow concentrations. The optimization experiments with response indicators of classification efficiency based on orthogonal design using Design-Expert software indicated that the optimal classification efficiency reached 91.32% with a feeding pressure of 0.03 MPa, a rinse water pressure of 0.02 MPa, and a feeding concentration of 12.5%. Meanwhile, the classification size was 49.99 μm, which agreed well with the predicted value.

• Periodical: Key Engineering Materials (Volume 835)
• Pages: 28-40
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.835.28
• Online since: March 2020
• Authors: You Jun Tao*, You Nan Zhao, Yu Shuai Xian, Ao Song, Yi Peng Wang, Zheng Xiang Shi
• Keywords: Classification Efficiency, Desliming, Hydrocyclone, Ultrafine Classification

References

[1] Chen Peng. The nature, classification and utilization of coal in China [M]. 2nd ed. Beijing: Chemical Industry Press, (2007).

[2] China Energy Research Association released China Energy Development Report 2016, [J]. Power and Energy, 2016, (05): 640.

[3] Tao Youjun, Gao Min, Shen Zhengyi et al. Experimental Study on Centrifugal Gravity Separation and Desulphurization of Fine Coal[J]. Coal Science and Technology, 2003, 31(11): 17-19.

[4] Tao Youjun, Song Ao, Zhai Yushuai, Wang Xu, Zhu Xiangnan. Study on the characteristics of inner-membrane flow in Falcon separator under centrifugal force[J]. Journal of China University of Mining & Technology, 2016, (03): 597- 601+609.

[5] Tao Youjun, Zhu Xiangnan, Wang Xu, Song Ao, Yan Yushuai. Numerical simulation of flow field in enhanced gravity separator[J]. Journal of China Coal Society, 2016, (05): 1244-1249.

[6] Xiang-nan Zhu, You-jun Tao, etal. The low efficiency of lignite separation by an enhanced gravityconcentrator.

[7] Xiang-nan Zhu, You-jun Tao, etal. Separation of flocculated ultrafine coal by enhanced gravity separator.

[8] Tang Wengang. Fundamental theory and application of hydrocyclone [D]. Chongqing University, (2006).

[9] Li Xiaodong. Research on the Influence of Additional Mechanisms on Graded Performance of Cyclones[D]. Taiyuan University of Technology, (2013).

[10] O.D. Polulyakh, I. P. Kurchenko, et al. R&D of a combined device for hydrocyclones and in-feed flotation pretreatment screens [C]. Proceedings of the 16th International Coal Preparation Conference, 2010: 251-254.

[11] Bhaskar K U, Govindarajan B, Barnwal J P, et al. Classification studies of lead–zinc ore fines using water-injection cyclone[J]. International Journal of Mineral Processing, 2005, 77(2):80-94.

DOI: 10.1016/j.minpro.2005.02.007

[12] Honaker R Q, Ozsever A V, Singh N, et al. Apex water injection for improved hydrocyclone classification efficiency[J]. Minerals Engineering, 2001, 14(11):1445-1457.

DOI: 10.1016/s0892-6875(01)00158-3

[13] Patil D D, Rao T C. Classification evaluation of water injected hydrocyclone[J]. Minerals Engineering, 1999, 12(12):1527-1532.

DOI: 10.1016/s0892-6875(99)00139-9

[14] He Qinglang, Sheng Hongguang. Application Research of Krebs gMaxHydrocyclone in Dashan Concentrator[J]. Mineral Resources Protection and Utilization, 2007(5):35-37.

[15] R. G. Moresch, Cui Hongshan, Li Changgen. Successful application of Krebs gMax cyclone in the coal industry [J]. Abroad Metal Mineral Concentration, 2003, 40(11):12-16.