EFFECT OF DRYING ON POWDER COATING EFFICIENCY AND AGGLOMERATION IN VIBRO-FLUIDIZED BED
2001; Taylor & Francis; Volume: 19; Issue: 2 Linguagem: Inglês
10.1081/drt-100102910
ISSN1532-2300
AutoresHiroyuki Kage, Keiichi Nishihara, Hiromichi Ishimatsu, Hironao Ogura, Yoshizo Matsuno,
Tópico(s)Mineral Processing and Grinding
ResumoAbstract Glass beads of 43 μm were coated in a vibro-fluidized bed by atomizing a fine silica powder together with polyvinyl alcohol aqueous solution. The coating efficiency and weight fraction of the agglomerated particles were measured under various experimental conditions, and their dependencies on the frequency and the direction of vibration were investigated. The coating efficiency and the degree of the agglomeration among core particles correlated well with an index R. The index R was introduced to evaluate quantitatively the drying conditions in a fluidized bed. Application of vertical vibration on the fluidized bed lowered the coating efficiency somewhat, while it prevented agglomeration. From the experimental results it was confirmed that coating with high quality and high efficiency, where few agglomerates were produced and silica powder was utilized efficiently, was possible in a vibro-fluidized bed with adequate vibration frequency and orientation of the vibration vector. Keywords: Adiabatic processAtomizationBinderFrequencyGlass beadSilicaSuspensionVibration ACKNOWLEDGMENTS We would like to express our gratitude to Catalysts and Chemicals Industry Co., Ltd., Japan, for the supply of silica powder.
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