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Particle size distribution of coal and gangue after impact-crush separation

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Abstract

Based on the separation and backfilling system of coal and gangue, the mineral material impact experiments were conducted utilizing the hardness difference between coal and gangue according to the uniaxial compression experiments. The broken coal and gangue particles were collected and screened by different size meshes. The particle size distributions of coal and gangue under different impact velocities were researched according to the Rosin-Rammler distribution. The relationships between separation indicators and impact velocities were discussed. It is found from experiments that there is a fully broken boundary of coal material. The experimental results indicate that the Rosin-Rammler distribution could accurately describe the particle size distribution of broken coal and gangue under different impact velocities, and there is a minimum overlap region when the impact velocity is 12.10 m/s which leads to the minimum mixed degree of coal and gangue, and consequently the benefit of coal and gangue separation.

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Authors and Affiliations

  1. School of Mechatronic Engineering, China University of Mining & Technology, Xuzhou, 221116, China

    Dao-long Yang  (杨道龙), Jian-ping Li  (李建平), Chang-long Du  (杜长龙) & Song-yong Liu  (刘送永)

  2. College of Mines and Earth Sciences, University of Utah, Salt Lake City, UT84112-0114, USA

    Ke-hong Zheng  (郑克洪)

Authors
  1. Dao-long Yang  (杨道龙)
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  2. Jian-ping Li  (李建平)
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  3. Chang-long Du  (杜长龙)
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  4. Ke-hong Zheng  (郑克洪)
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  5. Song-yong Liu  (刘送永)
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Corresponding author

Correspondence to Jian-ping Li  (李建平).

Additional information

Foundation item: Project(2012AA062102) supported by High-Tech Research and Development Program of China; Project(KYLX_1379) supported by the Innovation Training Project of Graduate Student in Jiangsu Province, China; Project supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions, China

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Yang, Dl., Li, Jp., Du, Cl. et al. Particle size distribution of coal and gangue after impact-crush separation. J. Cent. South Univ. 24, 1252–1262 (2017). https://doi.org/10.1007/s11771-017-3529-2

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  • DOI: https://doi.org/10.1007/s11771-017-3529-2

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