筛网旋流器分级效果影响因素研究  

Influencing factors of classification by screen cyclone

作　　者：田随国 翟震 熊志维 

机构地区：[1]河南神火兴隆矿业有限责任公司选煤厂,河南许昌461000

出　　处：《洁净煤技术》2015年第5期42-44,48,共4页Clean Coal Technology

摘　　要：针对泉店选煤厂粗煤泥回收系统中浓缩旋流器分级效果差,高灰细泥污染粗精煤等问题,采用筛网旋流器代替浓缩旋流器+高频筛组合对选煤厂进行改造,研究了筛网旋流器直径、入料口尺寸、溢流管直径、入料压力、入料浓度等因素对筛网旋流器分级效果的影响,并进行了筛网旋流器的工业应用试验。结果表明,筛网旋流器入料灰分高达19.78%,>0.125 mm粗颗粒产率为70.90%,粗颗粒比例大,浓度高,浓缩旋流器无法满足粗煤泥回收要求。改造后筛网旋流器底流中>0.125 mm粗颗粒产率为86.90%,灰分达到10.47%。筛网溢流和筛下水灰分分别为20.92%和21.56%,其中>0.5 mm浮选难以回收的粗颗粒仅占0.30%,有利于浮选机的回收。To improve efficiency of concentrated cyclone,avoid coarse clean coal pollution by high- ash fine slime,the screen cyclone was used to replace the combination of high frequency sieve and enrichment cyclone in Quandian coal preparation plant. The effects of screen cyclone diameter,size of feeding inlet,diameter of overflow pipe,pressure and concentration of feeding material on mesh cyclone classification effect was studied. The industrial application test of mesh cyclone was conducted. The results indicated that the ash content was19. 78%,the proportion of particle large than 0. 125 mm was 70. 90%,the proportion of coarse particle was large and the concentration was high,all of these made the enrichment cyclone couldn＇t meet the recovery requirements of coarse coal slime. The effects of feeding material concentration and particle properties on the screen mesh cyclone was studied. The results showed that the classification effects decreased with the increase of material concentration,the slurry viscosity and the content of slime. After transformation,the proportion of particles large than 0. 125 mm in bottom stream was 86. 90%,most of the coarse particle was removed and the ash content was 10. 47%. The ash content of overflow and underflow were 20. 92% and 21. 56% respectively. High ash fine slime was given into floatation system,the particle which was larger than 0. 5 mm accounted for 0. 30%,which was easy to be cycled by flotation machine.

关 键 词：筛网旋流器 粗精煤泥 高灰细泥 分级效率 

分 类 号：TD94[矿业工程—选矿]