某金矿全尾膏体充填与排放联合处置技术

摘要

针对国内某金矿原分级尾砂胶结充填存在的采场充填料浓度低、水泥耗量高以及尾矿库库容不足等诸多问题,对充填系统进行优化改造,提出了一种基于深锥浓密机的全尾膏体充填和堆存联合处置方案。改造后的充填系统运行过程中,选厂全尾砂经泵站打入深锥浓密机。需要充填时,深锥底流经两段卧式搅拌机与水泥混合,制备出膏体自流或泵送至采场。不需要充填时,底流由柱塞泵泵送至尾矿库进行膏体堆存。通过计算和实践证明：改造后的方案可节约充填成本1399万元/a,节约尾矿排放成本1040万元/a；尾矿排放浓度由35%提高至68%以上,增加了尾矿的堆积角,提高了尾矿库服务年限。全尾膏体充填和堆存联合处置方案可以很好地同时解决采空区充填和尾矿堆存2个难题,具有巨大的经济和社会效益,符合“绿色矿山”的建设理念。%For some problems such as low filling slurry concentration,high cement consumption and lack of tailings ca-pacity of classified tailings cemented backfill in a gold mine in China,a co-disposal scheme of unclassified-tailings paste filling and stockpiling based on the deep cone thickener was proposed to improve and optimize existing filling system. During the oper-ation of filling system post-improvement,all unclassified tailings from dressing plant were pumped into the deep cone thickener by first or multistage pumping station. When filling is required,thickener underflow is mixed with cement by two-stage horizon-tal mixer to produce paste which flow by gravity or pumped to stope. When filling is not required,underflow is transported to tailing pond for paste stockpiling by piston pump. The calculation and practice showed that the reforming scheme can save 13. 99 million yuan filling cost and 10. 4 million yuan tailings discharge cost per year. And,tailings discharge concentration was increased from 35% to 68% which contributes to increase the tailings stockpiling angle and prolong the service life of tailings pond. The co-disposal scheme of unclassified-tailings paste filling and stockpiling, according with the conception of “Green Mining”,can simultaneously realize goaf filling and tailings stockpiling.