Abstract
Bias flow is an important parameter in a flotation process of packed column. An experiment related to P2O5 recovery of phosphate rock was designed to study the effect of bias flow on the flotation separation efficiency by a direct-reverse flotation circuit of packed flotation column. The results have showed that the recovery of P2O5 is high during the combination of the direct-reverse flotation circuit. The grade and yield of P2O5 can reach to 32.77% and 82.64% respectively, under the condition of the range of-0.005~0 cms-1 of bias flow, 0.013~0.020 cms-1 of the wash water flow rate in the direct flotation column, and the range of 0.006~0.009 cms-1 of bias flow, 0.027~0.035 cms-1 of wash water flow rate in the reverse column.
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