Abstract
ABSTRACT The recovery of coal particles in a flotation column was investigated to determine its dependency on the type of frother, particle size, and gas and feed velocities. The kinetics of the cumulative recovery was established. The induction time and flotation rate constant were analyzed based on the recovery, incorporating the stability, attachment, and collision efficiencies of the particles with the bubbles. An inverse relationship between recovery and induction time was observed. Recovery of the particles was noticed to increase with superficial air velocity and frother dose, while it decreased with increasing particle size and feed circulation velocity. The induction time decreases with increasing superficial air velocity and frother dose but increases with increasing particle size and feed circulation velocity. Low induction time and high recovery were observed in the cationic frother. Small particles with low induction time can be captured with ease and have excellent selectivity. A generalized correlation for the induction time was proposed based on experiments under different operating conditions. The presented research will be beneficial in terms of increasing the transport efficiency of flotation systems.
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