平朔一号井选煤厂煤泥水系统改造

针对平朔一号井选煤厂细砂岩含量高造成的浓缩机压耙，滤饼变薄，加压过滤机处理能力下降等问题，通过分析分级旋流器底流和溢流的粒度组成，说明旋流器底流粒度较粗，灰分较高，导致精煤“背灰”，影响精煤质量；溢流粒度较粗，灰分较低，导致溢流跑粗量大。通过增加一期、二期工程和粗煤泥分选、回收系统对煤泥水系统进行改造。一期工程中，煤泥入浓缩机前回收细砂岩；二期工程中，将煤泥中细砂岩分离出来，煤泥和细砂岩采用两段浓缩两段回收。最后对选煤厂改造效果进行分析，改造后浓缩机入料中高灰细砂岩数量减少，减轻了浓缩机负荷，保证了加压过滤机、浓缩机的稳定生产；避免了细砂岩对精煤的污染，提高了精煤产率，优化了产品煤质量；选煤厂每年多产精煤86．49万t，年销售收入增加4．63亿元；节省了维修成本和材料成本，减轻了员工劳动量，增加了选煤厂处理能力。

Technical transformation of coal slime water processing system in Pingshuo No. 1 coal preparation plant

To resolve the problems of excessive slime accumulation ,thinning of filter cake and reduction of pressure filter handing capacity in Pingshuo No. 1 coal preparation plant, analyse the size composition of underflow and overflow of classifying cyclone, find that the size of underflow and overflow is large, the ash of underflow is high, while that of overflow is opposite. Transform the slime water processing system by adding the first-stage and second- stage project,coarse slime separation and recovery system. In the first-stage project, recycle fine sandstone before slime feeding into thickener. In the second-stage project, the fine sandstone is separated from slime. The slime and fine sandstone are recycled by two recycling thickeners in two stages. After transformation, the high-ash fine sandstone mixed in slime reduce, decrease the load of thickener, stabilize the operation of pressure filter and thickener, avoid the clean coal pollution. The coal preparation plant increase clean coal yield 8. 649× 105 tons, sales revenue 4.63 × 108 yuan per year. Save the maintenance and material cost, reduce the workload, increase the processing capacity of coal preparation plant.