Influence of Feeding Directions on the Separation Effect of Flotation Column
In order to improve the separation effect of the flotation column,the upward and tangential feeding pipe were arranged on the flotation column synchronously to form a flotation column combining the upward flow and rotating flow.By batch flotation mode,the flotation tests were carried out in three feeding directions,namely,upward,tangential and combined upward+tangential.The flow field characteristics in the flotation column under different feeding directions were simulated by using ANSYS FLUENT software.The results show that under the same test conditions,the upward feeding flotation has low ash content and good selectivity for the fine coal,and the tangential feeding flotation has ash content of 71.66％and high flotation recovery for the tail coal.The vortex is generated in the flotation column only under the upward feeding,and the existence of the slurry sucking inner cylinder generates the upward flow at the bottom of the flotation column.The existence of eddy currents in the flotation column and the low turbulence intensity in the upper section of the column are the main reasons for the good selectivity in the direction of upward feeding.The re-selection effect of the cone and the sucking inner cy-linder at the bottom of the column,which is similar to the structure of the water-only cyclone,is the main reason for the high ash content of tail coal under the feeding in tangential direction and combined upward+tangential direction.
Flotation columnFeeding directionSeparation effectFlow field simulation
万方数据
维普
