摘要
国外某石墨矿固定碳含量为22.25%,但黏土含量高、嵌布粒度细,采用常规直接浮选回收率损失过高(>12%)。工艺矿物学分析表明+0.074mm中石墨含量28%、高岭土含量20%,-0.020mm中石墨含量15%、高岭土含量55%。为提高石墨精矿回收率,根据工艺矿物学分析结果,采用预先分级浮选、粗精矿再磨再选、中矿返回的新工艺流程,可获得粒度分别为+0.3mm、-0.3+0.15mm和-0.15mm的三种精矿产品,固定碳含量分别为90.86%、96.53%和95.17%,精矿总回收率为94.00%,尾矿总回收率仅为6.00%,大大降低了尾矿中损失的回收率。
The recovery loss of graphite ore from abroad with fixed carbon content of 22.25% was too high by conventional flotation process because of the high-clay and fine embedded particle size.Process mineralogy study showed that 28% graphite and 20% kaolin were contented in ＋0.074 mm particle size,15% graphite and 55% kaolin were contented in-0.020 mm particle size.In order to improve the recovery rate of graphite concentrate,three concentrates with particle size of＋0.3 mm、-0.3＋0.15 mm and-0.15 mm were obtained by new process of pre-classified and flotation,re-grinding and re-flotation,middles returning,according to process mineralogy results.The fixed carbon content of concentrates was 90.86%、96.53% and 95.17%,respectively.The concentrate total recovery was 94.00%.The tailings total recovery,which was greatly reduced,was only 6.00%.
出处
《中国矿业》
北大核心
2018年第1期132-136,共5页
China Mining Magazine
关键词
高黏土
细鳞片石墨
选矿
分级
high-clay
fine flake graphite
beneficiation
classification
