The effect of wetting conditions on the strength of granules
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Technical University of Łodz
Publication date: 2002-01-01
Physicochem. Probl. Miner. Process. 2002;36(1):233-242
Results of investigations of the effect of the size of wetting liquid droplets and particle size distribution of a fine-grained raw material on the mechanical strength of granules formed during wet drum granulation were discussed. The process of granulation was carried out batch-wise in a drum granulator 0.5 m in diameter and 0.4 m long at rotational speed 0.33s-1 and constant volumetric drum filling degree φ = 0.1. On the bed tumbling in the drum the wetting liquid (distilled water) was supplied at a constant flow rate Q = 12⋅10-3 m3/h. The size of wetting droplets was changed using various air flow rates through pneumatic spray nozzles in the range Qa=1.0 to 3.0 m3/h and applying a sprinkler which supplied /drop-wise/ the liquid uniformly along the entire drum length. In the whole experimental cycle constant mean saturation degree of the feed equal to S = 0.293 was used. The effect of wetting droplet size and particle size distribution of the raw material on the breaking force and corresponding breaking stress was discussed.
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