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The influence of granule morphology on attrition during fluidization and pneumatic transport

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During the present work, particle attrition was studied in a well instrumented 3.5 cm diameter fluidized bed and a mechanical sieving apparatus while particle strength was determined from a compression-crush test. These results were correlated to attrition measurements performed in both a 5.08 cm diameter dense-phase and a 2.54 cm diameter dilute-phase pneumatic conveyer. The amount of fines (below 250 μm in diameter) generated during transport and fluidization were measured and modes of attrition were determined using scanning electron microscopy. It was found that both the fluid bed experiment and the compression-crush test gave good indications of attrition resistance in the dense-phase conveying loop. The generation of fines in the dilute conveying loop could be correlated satisfactorily only by results from the mechanical sieving test. A time-dependent study of attrition in the dense-phase conveyor and the fluidized bed tester was also undertaken. The attrition rates in both systems were fitted by a power law [1] and an exponential model. It was found that the physical phenomena of attrition in these systems is quite similar and scaling factors from the test to the conveyor were determined.

Affiliations: 1: Lever Brothers Co, Inc, 45 River Road, Edgewater, NJ 07020, USA; 2: The Department of Chemical Engineering, The City College of The City University of New York, 140th Street and Convent Avenue, New York, NY 10031, USA; 3: Department of Chemical Engineering, Imperial College, London, UK


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