旋转磁场对重介质旋流器分选效果的影响  

Influence of Rotating Magnetic Field on Separation Effect of Dense Medium Cyclone

作　　者：戚凯华 任辉 陈忠钰 王晖 樊民强[1] 董连平[1] 刘翼州[1] QI Kaihua;REN Hui;CHEN Zhongyu;WANG Hui;FAN Minqiang;DONG Lianping;LIU Yizhou(School of Mining Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China;School of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan,Shanxi 030024,China)

机构地区：[1]太原理工大学矿业工程学院,山西太原030024 [2]太原理工大学化学化工学院,山西太原030024

出　　处：《矿业研究与开发》2021年第12期161-167,共7页Mining Research and Development

基　　金：国家自然科学基金资助项目(51874208).

摘　　要：在重介质旋流器筒体位置施加同轴旋转磁场,通过旋转磁场改变重介质粉运动,进而实现重介质旋流器分选密度的在线调控。利用高速摄像系统观察了钢珠、磁铁矿粉在不同磁场特性下的运动形态。对磁铁矿粉悬浮液进行搅拌,观察了其在旋转磁场作用下的液位变化;并进行了粗煤泥分选试验。结果表明:旋转磁场顺时针旋转,钢珠逆时针旋转,磁铁矿粉形成磁链作逆时针翻转运动;当磁场旋转速度足够大时,磁链首尾相连成磁环,呈现为年轮状;磁铁矿粉悬浮液同样作逆时针转动,随着磁场转速的增加,其转速先增加后降低。旋流器分选试验表明:静态磁场会破坏旋流器的分选效果,与给料方向同向的旋转磁场降低了粗颗粒的分选密度,但提高了-0.25mm细颗粒精煤灰分,异向旋转磁场降低了旋流器的分选密度,提高了分选精度。The coaxial rotating magnetic field is applied at the cylinder position of the dense medium cyclone,and the movement of the dense medium powder is changed by the rotating magnetic field,so as to realize the on-line control of the separation density of the dense medium cyclone.The movement of steel ball and magnetite powder in different magnetic field was observed by using high-speed camera system.The suspension of magnetite powder was stirred and the liquid level change under the action of rotating magnetic field was observed and separation test of the coarse slime was carried out.The results show that when the rotating magnetic field rotates clockwise and the steel ball rotates counterclockwise,the magnetite powder forms a magnetic chain and reverses anticlockwise.When the rotation speed of the magnetic field is large enough,the magnetic chain is connected end to end to form a magnetic ring,showing a ring shape.With the increase of magnetic field speed,the rotation speed of magnetite powder suspension first increases and then decreases.When the magnetite powder suspension also rotates counterclockwise,the cyclone separation test shows that the static magnetic field will destroy the separation effect of the cyclone,and the rotating magnetic field in the same direction with the feeding direction reduces the separation density of coarse particles,but increases the ash content of-0.25mm fine particles.The rotating magnetic field in different directions reduces the separation density of the cyclone and improves the separation accuracy.

关 键 词：旋转磁场 重介质旋流器 反向运动 铁矿粉分层 

分 类 号：TD457[矿业工程—矿山机电]