给料浓度对浓密机内颗粒絮凝及沉降影响研究  

Effect of Feed Concentration on the Particle Flocculation and Settling Behavior in a Thickener

作　　者：崔宝玉[1] 林志昊 张艺邺 苑仁财 CUI Baoyu;LIN Zhihao;ZHANG Yiye;YUAN Rencai(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China;Zhongye Shenkan Engineering Technology Co.,Ltd.,Shenyang 110169,China)

机构地区：[1]东北大学资源与土木工程学院,沈阳110819 [2]中冶沈勘工程技术有限公司,沈阳110169

出　　处：《有色金属（选矿部分）》2024年第10期22-27,共6页Nonferrous Metals（Mineral Processing Section）

基　　金：国家自然科学基金资助项目(51974066,52174244)。

摘　　要：基于CFD-PBM耦合数值模拟方法,采用RNG k-ε湍流模型、Euler-Euler多相流模型以及所建立的微细矿物颗粒絮凝动力学数学模型,对直径为600 mm的实验室深锥型浓密机内铁尾矿颗粒絮凝及沉降行为进行了模拟研究,探究了给料浓度对颗粒复杂运动行为的影响。结果表明,在所研究给料浓度范围内,给料井出口位置絮团平均粒度随着给料浓度的增加先增加后减小,约为8%的给料体积浓度条件下铁尾矿颗粒絮凝效果较好;絮团沉降速率随着给料浓度增加而逐渐降低,且给料浓度增加,不同粒度絮团沉降速率差异逐渐减小。本研究为揭示浓度特性对微细矿物颗粒絮凝及沉降行为影响机制提供理论依据,为浓密机给料浓度调控提供技术指导。Based on CFD-PBM coupling simulation approach,the flocculation and settling behavior of iron tailings in the lab-scaled deep cone thickener with a diameter of 600 mm is simulated,where the turbulence and multiphase is described by RNG k-εmodel and Euler-Euler model,respectively.The flocculation of fine mineral particle is described by the proposed flocculation dynamics model.The effect of the feed concentration on the complex movement of particles is investigated.The results indicate that the mean floc size at the feed well outlet first increases and then decreases with the increase of the feed concentration in a certain range of feed concentration.The iron tailings have a better flocculation performance when the feed concentration is about 8%.The settling rate of the flocs decreases with the increase of the feed concentration,and the difference in settling rate of flocs of different sizes gradually decreases.This investigation can provide a theoretical basis for revealing the influence mechanism of concentration characteristics on the flocculation and settling behavior of fine mineral particles,and guide the technical control of feed concentration of a thickener.

关 键 词：浓密机 颗粒絮凝 沉降速率 数值模拟 浓度场特性 

分 类 号：TD926.2[矿业工程—选矿]