Abstract
This study investigates the expansion of the fluidised bed in HydroFloat™ as the teeter water velocity is varied. A practical model is presented for predicting the fluidised bed porosity and apparent density at set cell operating conditions (teeter water flow rate, air flow rate, bed height, pressure setting) and feed ore characteristics (specific gravity and particle size). Inversely, the model can be used to calculate the optimum HydroFloat™ settings to obtain the desired fluidised-bed porosity, for any ore of interest. The model is based on the well-known approach by Richardson and Zaki, modified by introducing more suitable settling rate equation within the typical particle size (and Reynolds numbers) range encountered in Hydrofloat™, and also considering the effect of air input. The model has been validated using two different copper ores in a range of feed particle size distributions, showing good predictive capabilities.
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