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This article describes the effect of vessel configurations on the drawdown and incorporation of floating solids to prepare concentrated alumina slurries in stirred tanks. The impeller speed and power draw required to incorporate all dry powder within four seconds, NJI and PJI, are used to evaluate incorporation performance. The effect of impeller type is assessed, with pitched blade impellers proving...
Two mechanisms for the drawdown of floating solids in baffled stirred tanks have been identified [Khazam, O. and Kresta, S., 2008, Mechanisms of solids drawdown in stirred tanks. Can J Chem Eng, 86(4): 622–634]: turbulent engulfment and mean drag. Baffling suppresses stable surface vortex formation and increases the intensity of mean drag and turbulence at the surface. Strong top to bottom liquid...
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