难选煤泥形貌特征及搅拌强化可浮性试验研究  

The morphological feature of hard-to-float fine coal and enhancing its floatability by stirring

作　　者：李延锋[1] 张晓博[1] 桂夏辉[1] 谢彦君[1] 吴朝龙[1] 赵闻达[1] 

机构地区：[1]中国矿业大学化工学院,江苏徐州221116

出　　处：《中国矿业大学学报》2012年第6期930-935,共6页Journal of China University of Mining & Technology

基　　金：教育部新世纪优秀人才支持计划项目(NCET-10-0767);国家自然科学基金项目(50904069);中国矿业大学科研人才基金项目(2011RC17)

摘　　要：运用扫描电镜(SEM)研究高灰难选煤泥的形貌特征,发现煤泥表面罩盖着大量的异质细泥,煤粒的微细裂隙中嵌布着高灰泥质,这些细泥主要是微米级的高岭土等易泥化的黏土矿物.在此基础上研究了调浆搅拌转速对煤粒的Zeta电位、接触角以及浮选指标的影响.结果表明:搅拌转速的增加,可降低煤粒表面的Zeta电位;强搅拌可清除粗煤粒表面的部分细泥罩盖层,提高煤粒的表面疏水性,最佳搅拌转速为2 200～2 400r/min;在保证精煤质量的同时,强搅拌条件下的精煤可燃体回收率比弱搅拌条件下提高10%以上.The morphological feature of hard-to-float fine coal was investigated by a scanning e- lectron microscope （SEM）, which shows that the fine coal surface is covered by heterogeneous fine clays and the cracks on coal particles surface are filled with high-ash fine clays. The fine clays are mainly consist of micron order clay mineral, e.g. kaolin, and easy to be mud. The effect of stirring speed on Zeta potential, contact angle and flotation behavior were investiga- ted. The results show that Zeta potential can be reduced by increasing the stirring speed. The hydrophobicity of fine coal particle can be increased by high-intensity stirring which may remove the fine clays from coal surface. The optimum stirring speed is 2 200--2 400 r/min. The combustible matter recovery under a higher stirring speed is increased by 10% than that under a lower stirring speed when the ash content of clean coal is qualified.

关 键 词：煤泥 形貌特征 搅拌 调浆 ZETA电位 浮选 

分 类 号：TD923[矿业工程—选矿]