Mixing and segregation behavior in an air dense medium fluidized bed with binary mixtures for dry coal beneficiation

Zhijie Fu, Jesse Zhu, Shahzad Barghi, Yuemin Zhao, Zhenfu Luo, Chenlong Duan

Research output: Journal PublicationArticlepeer-review

17 Citations (Scopus)

Abstract

Particle mixing and segregation behavior in an Air Dense Medium Fluidized Bed with binary mixtures of solid particles were investigated for dry coal beneficiation. Magnetite mixed with coal/gangue/sand particles belonging to Geldart B/D group were tested individually for the bed density adjustment. The effects of operating parameters including particle density ratio, particle size ratio, mixture composition, superficial gas velocity, and fluidized bed height on the mixing and segregation pattern were examined. The results demonstrated that the segregation becomes more severe with increasing density difference of binary mixtures. An increase in particle size ratio may also lead to partial segregation. Mixing and segregation of binary systems are almost independent of lower excess gas velocity and initial bed height when it is over 15 cm. Moreover, a mixing index was employed to evaluate the mixing and segregation performance, and the criteria for good mixing to achieve the bed density adjustment were identified.

Original languageEnglish
Pages (from-to)161-169
Number of pages9
JournalPowder Technology
Volume371
DOIs
Publication statusPublished - 30 Jun 2020
Externally publishedYes

Keywords

  • Air dense medium fluidized bed
  • Binary mixture
  • Mixing and segregation

ASJC Scopus subject areas

  • Chemical Engineering (all)

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