煤泥浮选过程能量输入对浮选效率的影响  

Effect of Energy Input on Flotation Efficiency in Fine Coal Flotation Process

作　　者：卢军[1] 谭兴富[1] 杨帆[2] 张勇[2] LU Jun;TAN Xingfu;YANG Fan;ZHANG Yong(Beijing Huayu Engineering Co.,Ltd.,China Coal Technology and Engineering Group,Pingdingshan 467000,China;Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]中煤科工集团北京华宇工程有限公司,河南平顶山467000 [2]安徽理工大学,安徽淮南232001

出　　处：《煤炭技术》2023年第5期269-272,共4页Coal Technology

基　　金：安徽省重点研发计划基金资助项目(2022n07020001)。

摘　　要：能量输入贯穿整个煤泥浮选过程,对提高浮选效率起到关键作用。针对能量输入对煤泥浮选效果的影响,试验借助高速摄像系统设计并搭建了煤泥颗粒-气泡包裹角测量装置,研究了不同能量输入条件下颗粒-气泡包裹角变化规律,进一步探究了叶轮搅拌转速、搅拌时间和煤油用量对浮选效率的影响机制,结果表明:浮选精煤可燃体回收率和灰分均随着叶轮搅拌转速、搅拌时间和煤油用量的增加先增大后减小,且分别在700 r/min、40 s和1.55μL/g时浮选精煤回收率达到最大值。合适的能量输入有利于煤泥颗粒与气泡的充分碰撞并吸附,从而显著提高浮选效率。能量输入不足导致煤泥颗粒与气泡接触不充分,而当能量输入过剩,煤泥颗粒与气泡发生过度调浆,颗粒与气泡碰撞概率降低,脱附概率增加,最终导致浮选效率降低。Energy input plays a key role in improving flotation efficiency throughout the whole coal slurry flotation process.To investigate the effect of energy input on the flotation efficiency of coal slurry,a particle-bubble wrapping angle measurement device was designed and constructed with the aid of a high-speed camera system.The results showed that the recoveries of flotation concentrate and ash content increased and then decreased with the increase of impeller stirring speed,stirring time and paraffin dosage,and reached the maximum values at 700 r/min,40 s and 1.55μL/g,respectively.A suitable energy input facilitates sufficient collision and adsorption of coal slurry particles with air bubbles,thus significantly improving flotation efficiency.Insufficient energy input led to insufficient contact between coal slurry particles and bubbles,while when there was excess energy input,excessive slurrying of coal slurry particles and bubbles occurred,the probability of particle-bubble collision decreased and the probability of desorption increased,which eventually led to a decrease in flotation efficiency.

关 键 词：煤泥浮选 包裹角 搅拌转速 搅拌时间 能量输入 

分 类 号：TD94[矿业工程—选矿]