入口流量对螺旋溜槽首圈流场演变及矿物颗粒分布的影响  

Influence of the Inlet Flow Rate on Flow Field Evolution and Mineral Particle Distribution in the First Turn of Spiral Separators

作　　者：孟令国[1] 高淑玲[1] 周孝洪 魏德洲[1] MENG Ling-guo;GAO Shu-ling;ZHOU Xiao-hong;WEI De-zhou(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2023年第6期856-862,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51974065,52274257).

摘　　要：螺旋溜槽首圈流场特性及其演变对矿物颗粒运动与分离结果具有决定性影响.针对实验室ϕ300 mm螺旋溜槽,采用RNG k-ε湍流模型､VOF和Eulerian Multi-fluid VOF多相流模型,系统考察了入口流量对螺旋溜槽首圈流场演变及赤铁矿和石英颗粒分布的影响.结果表明,增加入口流量会延长外缘处流膜形态､主流及二次环流达到稳定时的历程;随着入口流量的增大,石英和赤铁矿的分层效果得到增强,赤铁矿分布范围相应变宽,而石英向外缘流膜中的迁移量增加;首圈的最大分离效率随入口流量的增大呈现先增大而后渐稳的趋势,适宜的最低入口流量为7 L/min,此时首圈的最大分离效率可达61.45%.The characteristics and evolution of the flow field in the first turn of the spiral separator play an important role on the movement and separation of mineral particles.For the laboratory-scale spiral separator(ϕ300 mm),the turbulence model of RNG k-εand the multiphase flow model of the volume of fraction(VOF)as well as the Eulerian Multi-fluid VOF were used to investigate the influence of the inlet flow rate on the flow field evolution and the distribution of hematite and quartz particles in the first turn of spiral separators.With the increase of inlet flow rate,the distance to reach the stability of the flow film shape,primary and secondary flows at the outer trough are prolonged.The stratification performance of quartz and hematite is enhanced.Meanwhile,the hematite ore band is correspondingly widened,and the migration of quartz to the outer trough of the thick flow film region is increased.With the increase of the inlet flow rate,the maximum separation efficiency of the first turn increases first and then gets stable.The suitable inlet flow rate of 7L/min can be obtained with the maximum separation efficiency of 61.45%.

关 键 词：螺旋溜槽 首圈流场演变 稳定性 颗粒分布 分离效率 

分 类 号：TD455[矿业工程—矿山机电]