基于Fluent的快浮嵌入式浮选柱给料方式数值研究  

Numerical research on feed mode of flotation column embedded with fast flotation unit based on Fluent

作　　者：张宁宁[1,2] 周长春[1,2] 闫小康[1,2] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116 [2]国家煤加工与洁净化工程技术研究中心,江苏徐州221116

出　　处：《中南大学学报（自然科学版）》2016年第1期1-7,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51174205);新世纪优秀人才支持计划资助项目(NCET-12-0962);中央高校基本科研业务费专项资金资助项目(2011QNB09;2014QNB16)~~

摘　　要：基于微细粒铝土矿浮选的速度快、泡沫量大等特点,提出在旋流-静态微泡浮选柱上部嵌入快速浮选单元。为了研究嵌入式快浮单元下的给料方式对浮选柱内部流场的影响,利用计算流体力学Fluent软件对传统工业给料以及2种快浮单元给料结构下的浮选柱内部流场进行数值模拟。研究结果表明：3种给料方式下的柱体内流线虽有差异,但均能满足浮选柱对物料分选的基本要求;对于3种不同的给料方式,浮选柱旋流段的旋涡强度基本相同,在同一径向位置上切向速度的最大差值在0.1 m/s以内,说明给料方式对浮选柱内部流场影响较小;与其他2种给料方式相比,快浮单元环形给料下的浮选柱入料段湍流强度低,湍动能主要集中在0-0.05 m2/s2,柱分选段轴向速度主要集中在-0.15-0.15 m/s,轴向速度沿径向分布较其他2种均匀,对矿物的分选以及二次富集更有利。Based on characteristics of fast speed and large amount of foam in flotation of micro-fine bauxite, a fast flotation unit embedded in the cyclone-static micro bubble flotation column was proposed. In order to study the effects of feeding methods on flow field in flotation column embedded with fast floating units, Fluent, a computational fluid dynamics software, was used to simulate the internal flow field structure of flotation column with different feeding forms, including a traditional industry feeding form as well as two feeding forms under fast floating unit. The results show that all the forms could meet the basic requirements of flotation column for sorting materials, in spite of the difference of flow lines in the column. For three feeding methods, the vortex intensities of swirl segment in column are basically the same, and the maximum difference among the tangential velocities at the same radial position is within 0.1 m/s, which illustrates that feeding methods have little influence on the flow field in flotation column. For the feed method of ring device, the turbulent kinetic energy of feeding segment and the axial velocity of the column sorting segment are mainly concentrated in the range of 0-0.05 m2/s2 and-0.15-0.15 m/s, respectively. In addition, axial velocity distributed in theradial direction is more stable than those when using the other two methods in the column sorting segment. Therefore, compared with the other methods, the ring feed device of fast floating unit is more beneficial for mineral sorting and secondary enrichment.

关 键 词：旋流-静态微泡浮选柱 快速浮选单元 FLUENT 数值模拟 给料方式 

分 类 号：TD923.7[矿业工程—选矿]