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

• Published in: Powder technology 2020-06, Vol.371, p.161-169
• Main Authors: Fu, Zhijie, Zhu, Jesse, Barghi, Shahzad, Zhao, Yuemin, Luo, Zhenfu, Duan, Chenlong
• Format: Article
• Language: English
• Subjects: Air dense medium fluidized bed; Beneficiation; Binary mixture; Binary mixtures; Binary systems; Coal; Density ratio; Fluidized beds; Gangue; Magnetite; Mixing and segregation; Particle density (concentration); Particle size; Velocity
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2020.05.094

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. [Display omitted] •Mixing and segregation of binary mixtures of Geldart B/D particles were studied.•The effects of particle properties and operating parameters were considered.•A mixing index was used to evaluate the solids mixing and segregation performance.•The criteria for good mixing to achieve bed density adjustment were identified.