Separation performance of fine low-rank coal by vibrated gas–solid fluidized bed for dry coal beneficiation--颗粒学报PARTICUOLOGY

He, J., Zhao, Y., Zhao, J., Luo, Z., Duan, C., & He, Y. (2015). Separation performance of fine low-rank coal by vibrated gas–solid fluidized bed for dry coal beneficiation. Particuology, 23, 100-108. https://doi.org/10.1016/j.partic.2015.02.006

Separation performance of fine low-rank coal by vibrated gas–solid fluidized bed for dry coal beneficiation

Jingfeng He ^*, Yuemin Zhao, Jie Zhao, Zhenfu Luo, Chenlong Duan, Yaqun He

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

10.1016/j.partic.2015.02.006

Volume 23, December 2015, Pages 100-108

Received 31 August 2014, Revised 6 November 2014, Accepted 4 February 2015, Available online 14 July 2015, Version of Record 2 December 2015.

E-mail: jfhe@cumt.edu.cn

Highlights

• Vibrated gas–solid fluidized bed (VGFB) was used to separate 1–6 mm sized fine low-rank coal.

• Segregation of lignite samples were investigated with various operating parameters.

• The optimal operating conditions were obtained for dry beneficiation of lignite.

• The separation performance of fine lignite was greatly improved by VGFB.

Abstract

Vibrational energy was introduced to a dense medium gas–solid fluidized bed to improve the separation performance of 1–6 mm fine low-rank coal. The setup was termed a vibrated gas–solid fluidized bed and could provide a stable fluidization state and uniform density distribution for dry coal beneficiation by the transfer of vibrational energy and the interaction between vibrations and the gas phase. Favorable segregation of the ash content of the 1–6-mm-sized lignite samples is achieved under suitable operating conditions. Higher yields of cleaning coal were acquired when the ash content was reduced. The probable error values were 0.065 and 0.055 at separating densities of 1.68 and 1.75 g/cm3 for the 1–3- and 3–6-mm-sized lignite samples, respectively. Effective beneficiation of 1–6-mm-sized fine lignite could be achieved using the vibrated gas–solid fluidized bed, which provides an alternative technique for the separation of fine low-rank coal in arid areas.

Graphical abstract

Keywords

Lignite; Vibrational energy; Gas–solid fluidized bed; Segregation; Separation performance

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