Effect of a cyclonic flotation column on the separation of magnesium from phosphate ore  

作　　者：Li Guosheng Liu Jiongtian Cao Yijun Wang Dapeng 

机构地区：[1]School of Chemical Engineering and Technology, China University of Mining ＆ Technology, Xuzhou 221008, China

出　　处：《Mining Science and Technology》2011年第5期647-650,共4页矿业科学技术（英文版）

基　　金：supported by the National Key Technology R&D Program for the 11th Five-Year Plan of China(No. 2008BAB31B01)

摘　　要：This study was performed to investigate the effects of the cyclonic separation mechanism on the removal of magnesium from phosphate ore. An analysis of the particle-bubble collision mechanism in a cyclonic force field was used to design two different pulp circulation systems for a cyclonic-static micro-bubble flotation column （FCSMC）. Experiments comparing the two conditions were then conducted. Size analysis of the feed and separated products was conducted with a BXF cyclone size analyzer. The results show that about 34.60% of the total MgO content in the feed exists in the -10 μm fraction. This demonstrates that magnesium removal from phosphate ore has the characteristics of a micro-fine particle flotation problem. Under conditions of cyclonic circulation the MgO level of the concentrate is 1.74g, which is lower than that obtained from the column operated in direct-flow circulation by 0.34%, These results indicate that the cyclonic circulation mechanism of the FCSMC can promote removal of micro-fine particles containing magnesium. This is attributed to the function of surface flotation and to the reduction of the lower separation limit under conditions of cyclonic circulation.This study was performed to investigate the effects of the cyclonic separation mechanism on the removal of magnesium from phosphate ore. An analysis of the particle-bubble collision mechanism in a cyclonic force field was used to design two different pulp circulation systems for a cyclonic-static micro-bubble flotation column (FCSMC). Experiments comparing the two conditions were then conducted. Size analysis of the feed and separated products was conducted with a BXF cyclone size analyzer. The results show that about 34.60% of the total MgO content in the feed exists in the 10 lm fraction. This demonstrates that magnesium removal from phosphate ore has the characteristics of a micro-fine particle flotation problem. Under conditions of cyclonic circulation the MgO level of the concentrate is 1.74%, which is lower than that obtained from the column operated in direct-flow circulation by 0.34%. These results indicate that the cyclonic circulation mechanism of the FCSMC can promote removal of micro-fine particles containing magnesium. This is attributed to the function of surface flotation and to the reduction of the lower sep- aration limit under conditions of cyclonic circulation.

关 键 词：Flotation columnCyclonic separationPhosphate oreRemoval of magnesium 

分 类 号：TD456[矿业工程—矿山机电] P457.8[天文地球—大气科学及气象学]