济三选煤厂降低介耗生产实践

分析了济三选煤厂重介选煤工艺,说明选煤厂主要存在煤泥水分高,一段底流煤泥量大、洗水浓度高,煤泥重介旋流器入料不稳、介质回收率偏低等问题。通过分析选煤厂水介耗、精中矸磁选机入料和尾矿磁性物含量,说明脱介筛筛板孔径偏大,筛子喷水压力不够,筛子喷嘴易堵,精、中磁选机入料不稳,介质质量差是造成选煤厂介耗高的主要原因。针对上述问题,济三选煤厂通过调整脱介筛筛板孔径,增加脱介筛喷水压力,改造脱介筛喷嘴,改造煤泥重介旋流器和保证介质质量合格等对选煤厂重介生产工艺进行了改造。结果表明:改造完成后,济三选煤厂水介耗明显降低,与2010年相比,2011年6月选煤厂水耗由0.055 kg/t降至0.045 kg/t;介耗由2.710 kg/t降至1.424 kg/t,减少了1.286 kg/t,每年可节约介质1286 t,节省介质费用194万元。

Medium consumption reduction in Jisan coal preparation plant

The analysis of dense-medium coal preparation process in Jisan coal preparation plant show that there are lots of problems,involving high moisture in slime,large slime content in primary underflow,high concentration washing water,unstable feeding into dense-medium cyclone,low medium recovery and the like.Through researching medium consumption,raw materials into clean coal and middlings magnetic separator and magnetic substance in tailings,find that large pore size of sieve plate of medium draining screen,low water pressure,frequent nozzle jaming,unstable feeding into clean coal and middlings magnetic separator and poor medium quality lead to high medium consumption.To resolve these problems,adjust the pore size of sieve plate,improve water pressure,transform nozzle of medium draining screen and dense-medium cyclone,guarantee medium quantity and so on.The results show that,the water and medium consumption remarkably drop.Compare with the medium consumption in June,2010,it decreases from 2.710 kg/t to 1.424 kg/t in June,2011,the water consumption decreases from 0.055 kg/t to 0.045 kg/t,save medium 1286 tons in one year which worth 1.94 million yuan.