煤颗粒与气泡间相对运动过程的试验研究  

Experimental study of the process of relative motion of bubble and coal particle

作　　者：卓启明 刘文礼[1] 徐宏祥[1] 孙小朋 张伟 崔日辉 ZHUO Qiming;LIU Wenli;XU Hongxiang;SUN Xiaopeng;ZHANG Wei;CUI Rihui(School of Chemical&Environmental Engineering,China University of Mining&Technology(Beijing),Beijing 100083,China;Key Laboratory of Mineral Processing Science&Technology,Beijing 102628,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083 [2]矿物加工科学与技术国家重点实验室,北京102628

出　　处：《选煤技术》2020年第1期6-11,共6页Coal Preparation Technology

基　　金：国家自然科学基金资助项目(51974324);矿物加工科学与技术国家重点实验室开放基金资助项目(BGRIMM-KJSKL-2020-22);中央高校基本科研业务费专项基金资助项目(2010YH11)。

摘　　要：针对当前颗粒与气泡间相对运动过程研究中理论推导居多、试验研究相对匮乏的情况,在阐述和分析两种颗粒与气泡间相对运动过程监测方法的基础上,提出了一套颗粒与气泡碰撞、黏附行为测量系统,并利用该系统对内蒙古公乌素原煤颗粒与气泡间的相对运动过程进行了观测。试验结果表明:在远场区,煤颗粒处于自由沉降状态,运动轨迹不受影响,进入近场区后,受气泡阻力的影响,煤颗粒逐渐偏离原来运动轨迹,趋于沿气泡切线方向运动;在远场区,煤颗粒以沉降末速向气泡逼近,随着二者间距离的不断减小,煤颗粒运动速度逐渐降低,且在二者碰撞时达到最低,之后煤颗粒沿气泡表面向下滑落,运动速度逐渐增大,当滑落至气泡“赤道”位置时达到最大,越过气泡“赤道”位置后又开始降低;当煤颗粒滑落至气泡中心以下0.34 mm位置时,彻底从气泡上脱落。The investigations of the relative motion of bubble and particle currently conducted is predominately theoretical research with very few work being directed toward the aspect of experimental study.Following a description and analysis of the direct and indirect methods for observation of such a motion,an experimental apparatus capable of making the observation is developed based on the above mentioned two methods,and the apparatus developed is used for making a study of the relative motion of bubble and raw coal particle at Gongwusu Coal Preparation Plant,Inner Mongolia.Test result shows that:the coal particle assumes a free settling state when it moves to the area far off the bubble and then deviated from its original motion direction and finally tends to move along the bubble′s tangential direction when it comes nearer to the bubble;the velocity of motion of the particle is rather steady in the area away from the bubble,and then the velocity slows down with the reduction of the distance between the bubble and the particle,and finally comes down to the lowest value at the time when the particle collides with the bubble;after the collision,the particle starts to slide down from the bubble and moves faster and faster and reaches a highest value when it comes to the bubble′s equator position,and then it moves slower and slower and finally comes off the bubble when it moves to the position 0.34 mm below the bubble′s central line.

关 键 词：浮选 煤颗粒 相对运动过程 直接监测 运动轨迹 运动速度 

分 类 号：TD943[矿业工程—选矿]