The effect of granulation conditions on bulk density of a product
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Technical University of Lodz
Tadeusz Gluba   

Technical University of Lodz, Faculty of Process and Environmental Engineering Stefanowskiego 12/16, 90-924 Lodz, Poland
Publication date: 2004-01-01
Physicochem. Probl. Miner. Process. 2004;38(1):177–186
Changes in bulk density of a bed during wet granulation of silica flour in a batch drum granulator were studied. Three size fractions of the flour were used in the studies. They differed in the particle size composition and mean particle dimension. Variable parameters were the wetting conditions (droplet diameter, degree of bed saturation) and particle size composition of the raw material. The bed of loose material was wetted while tumbling, at a constant volumetric flow rate, using a system of two pneumatic spray nozzles. In each trial at determined time intervals feed samples were taken from the drum to specify the particle composition and bulk density of granulated material at a given stage of the process. The effect of droplet diameter, mean size of raw material particles and the saturation of granulated bed on changes in the bulk density of a product was estimated. A correlation equation describing the effect of tested parameters on bulk density changes was proposed.