基于激光PIV技术的XFD浮选机流场特征分析

采用激光粒子成像测速(PIV,particle imaging velocimetry)技术对XFD-1.5L浮选机流场进行测定,揭示了XFD浮选机流场特征。在浮选机转速为1 000r/min的条件下,对10-10、20-20和30-30等3个平面进行了探测。实验结果表明,XFD浮选机主要特征为:流体在主槽与副槽之间循环;浮选机主槽可以分为3个区域,Y=0~25mm区间以水平旋转流为主,Y=25~120mm区间以上升流为主,Y=120~145mm区间以流向副槽的水平流为主,分别对应于浮选理论中的搅拌区、分离区和泡沫区;浮选机流场设计合理,有利于矿物的分选。

Flow field features analysis of XFD floatation machine based on PIV technique

Particle image velocimetry (PIV) method,which has been widely applied in flow field testing in recent years,is a flow measurement technique using laser imaging tec hnology.XFD floatation machines are most frequently used in floatation experiments.Research on their characteristics of flow fields can provide basic data for floatation-machine de sign and promote design level of floatation machine.In this paper,related experi ments have been performed on investigating flow field in XFD-1.5L floatation ma chine to reveal its characteristics by PIV method.When agitation speed of the floatation machine i s set at 1000r/min,three planes (10-10,0-20and 30-30) in the sti rring tank are illuminated by laser and studied.As a result,the main characteristics can be described as follows:t he fluid circuits from stirring tank to the chute;the main cell consists of three zones,which ar e the zone between Y=0~25mm mainly with horizontal circulating flow,the zo ne between Y=25~120mm mainly with rising flow and the zone between Y=120~145mm mainly wit h horizontal flow moving towards the chute,corresponding to stirring zone,separating zone and froth zone desc ribed by floatation theory,respectively.The results suggest that the design of t he floatation machine is rational and can facilitate mineral separation.