絮团稠化对全尾砂浓密性能的影响  

Effects of aggregate densification on unclassified tailings thickening performance

作　　者：周旭 王洪江[1,2] 吴爱祥[1,2] 曹炎森[1,2] 牛鹏[1,2] ZHOU Xu;WANG Hongjiang;WU Aixiang;CAO Yansen;NIU Peng(School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,Beijing 100083,China;Xinda Gold and Silver Development Center,Beijing 100038,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]金属矿山高效开采与安全教育部重点实验室,北京100083 [3]鑫达金银开发中心,北京100038

出　　处：《中南大学学报（自然科学版）》2019年第7期1670-1676,共7页Journal of Central South University:Science and Technology

基　　金：国家重点研发计划资助项目(2017YFC0602903);国家自然科学基金资助项目(51574013;51674034)~~

摘　　要：基于全尾砂浓密过程料浆质量分数高,尾矿絮团无法直接观测,而取样稀释再进行测试分析难以避免误差,借助FBRM和PVM实时在线监测和分析系统,观测全尾砂浓密过程耙架剪切应力和重力耦合作用下絮团颗粒结构和粒度的变化。研究结果表明:在泥层高度分别为25,45和70cm的3个全尾砂浓密阶段内均保持耙架转速为15r/min的试验条件下,直径在100μm以上的絮团逐渐破裂重构而数量减少,直径在10μm以下絮团数量相应增加,松散的大絮团逐渐演化成为密实的小絮团;絮团有效直径随剪切时间延长和泥层高度增加而减小,絮团稠化速程度随泥层高度上升而加快;有效干涉沉降系数是基于絮团有效直径的函数,随剪切时间延长和泥层高度增加呈现先增大后稳定的趋势。Due to the high concentration of unclassified tailings slurry thickening process,flocculated aggregates of tailings particles can't be directly observed,and the deviation of sampling and diluted analyzing is unavoidable.Based on focused beam reflectance measurement (FBRM) and particle vision microscope (PVM) real-time online monitoring and analysis system,the study of aggregate densification under rake shear stress coupled with gravity during unclassified tailings thickening process was accomplished.The results show that in three thickening test stages of mud bed height 25, 45 and 70 cm with the same rake shear ratio 15 r/min,the amount of aggregates diameter over 100 μm decreases,while the amount of aggregates diameter under 10 μm increases,because the large and loosen aggregates are reconstructed and deformed into small and denser aggregates.Effective aggregate diameter decreases as shear time mud bed height increases,and the aggregate densification accelerates with mud bed height rises.As the function of effective aggregate diameter,the effective hinder settling factor rapidly increases first and then becomes stable when shear time increase and mud bed height rises.

关 键 词：泥层高度 絮团稠化 絮团有效直径 有效干涉沉降系数 

分 类 号：TD853.34[矿业工程—金属矿开采]