文献类型：期刊文献

中文题名：微细粒疏水矿物表面微泡强化浮选的作用机理

英文题名：Fundamental understanding of microbubbles on fine hydrophobic mineral surface in flotation

作者：刘清侠[1];李明达[2];郭蔚[3];刘博[4]

机构：[1]深圳技术大学新能源与新材料学院,广东深圳518118;[2]阿尔伯塔大学化工与材料学院,阿尔伯塔埃德蒙顿T6G 1H9;[3]中国矿业大学煤加工与洁净化工程技术研究中心,江苏徐州221116;[4]华东理工大学机械与动力工程学院,上海200237

年份：2022

卷号：51

期号：3

起止页码：466

中文期刊名：中国矿业大学学报

外文期刊名：Journal of China University of Mining & Technology

收录：CSTPCD;;EI(收录号：20222112143944);Scopus;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：国家自然科学基金项目(52174255)。

语种：中文

中文关键词：表面微泡;气泡-颗粒相互作用;团聚;气泡-气泡相互作用

外文关键词：microbubbles;bubble-particle interaction;agglomeration;bubble-bubble interaction

摘要：微泡在微细粒矿物浮选中,体现了较高的回收率和较好的选择性.相比较大气泡而言,微气泡对浮选的显著改善主要是由于气泡-颗粒之间碰撞频率和附着概率的增加.研究结果表明:矿物表面的微气泡,即已经附着在颗粒上的气泡,可增加浮选回收率;细辉钼矿颗粒(D_(50)=21.8μm)的微泡浮选试验表明,通过流体空化产生的表面微泡可以实现更高的回收率.辉钼矿可浮性的提高主要原因是:矿物表面微泡引起的颗粒团聚和颗粒与浮选气泡之间的诱导时间减少.Zeta电位分布的分析表明微泡在矿物颗粒表面空化.经光学显微镜观察,发现矿物颗粒是通过表面微泡形成团聚.通过动态力装置(Dynamic Force Apparatus,DFA)观测到了表面微泡和浮选气泡之间液膜的快速排液过程.本文拓展了微细粒浮选中表面微泡的理论深度,对实际生产具有一定的指导意义.
Micro-bubbles are used to improve the recovery and selectivity in the flotation of fine particles.The significant improvement of micro-bubbles over macrobubbles is mostly attributed to the increase of bubble-particle collision frequency and attachment probability.The results show that the surface micro-bubbles,which refers to the bubbles already attached on the particles,also increase the flotation recovery.Micro-flotation tests on fine molybdenite particles(D_(50)=21.8μm)show that higher recovery can be achieved by surface micro-bubbles generated through hydrodynamic cavitation.The improved flotation performance is explained by two mechanisms:particle agglomeration by surface micro-bubbles and decreased induction time between particles and flotation bubbles.Analysis of the zeta-potential distributions indicates that micro-bubbles are cavitated on the surfaces of mineral particles.The agglomeration of mineral particles by surface micro-bubbles is observed by an optical microscope.The rapid film drainage between surface microbubble and flotation size bubble was demonstrated by carefully designed bubble pair experiments using dynamic force apparatus(DFA).Our findings advance the fundamental understanding of surface micro-bubbles in fine particle flotation.