FLUIDIZATION STATE OF ULTRAFINE POWDERS

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

ATSUO KOBATA¹  KATSUKI KUSAKABE¹  SHIGEHARU MOROOKA¹  YASUO KATO¹ 

[1] Department of Applied Chemistry, Kyushu University

关键词: Fluidization;    Chemical Reactor;    Powder;    Particle;    Agglomeration;    van der Waals Force;    Adhesion;    Minimum Fluidization Velocity;   

DOI  :  10.1252/jcej.21.41

来源: Maruzen Company Ltd

【 摘 要 】

References(16)Cited-By(94)The fluidity of submicron powders was studied in a small-scale transparent column. Powders of Ni, Si3N4, SiC, Al2O3 and TiO2 were smoothly fluidized when gas velocity exceeded the apparent minimum fluidization velocity. The electrical conductivity of the particles did not affect the fluidizing quality in the range of the present experiments. All the tested submicron particles formed agglomerates during fluidization. The agglomerate size and the apparent minimum fluidization velocity were dependent on species of particles and fluidizing gas. The equilibrium size of agglomerates calculated from the apparent minimum fluidization velocity and the sedimentation velocity was in the range of 70-700 μm. However, the agglomerates of CaCO3 and ZrO2 were very cohesive and could not be evaluated. The primary particle size was not a proper measure for the classification of fine particles.

【 授权许可】

Unknown