عنوان مقاله [English]
The crucial role of bubble surface area flux (Sb) and gas hold-up (εg) in flotation columns efficiency has been proved. This research examines the effect of gas flow rate, feed rate, frother concentration, froth height, particle size and solid percent variables on gas dispersion parameters (gas hold-up and bubble surface area flux). Test work has been conducted in a column with 10 cm diameter and 400 cm height. Feed to flotation column has been provided by rougher mechanic cell concentrate of Miduk copper complex. Gas hold-up has been measured by pressure difference method and bubble size has been estimated by drift flux analysis. The results of the study reveal that superficial gas velocity and frother rate have a positive impact on bubble surface area flux; however, the increase of pulp solid percent leads to a drop in Sb. Studies on the gas dispersion parameters in flotation columns show that although gas hold-up decreases due to the improvement of feed flow rate, its effect, in comparison to the air flow rate and frother rate, is negligible. Gas hold-up decreases in collection zone when solid percent increases and this decreasing rate has become more significant in coarser particles. Likewise, by decreasing the froth height, low reduction can be observed in gas hold-up. Finally, a model for prediction of Sb on the basis of εg has been carefully presented by the use of statistical methods.
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