0.2 mm筛缝精煤泥弧形筛工业性指标分析

Analysis of the industrial performance of the clean coal slime sieve bend with an aperture size of 0.2 mm

为了解决质量合格的细煤泥存在重复分选的问题,凤凰台选煤厂对筛缝0.2 mm和0.4 mm带有气动击打器的精煤泥弧形筛进行了工业性平行对比试验,试验结果表明:0.2 mm筛缝弧形筛比0.4 mm弧形筛的筛分效率高出16.85个百分点,为85.66%,分配粒度为0.152 mm,分配曲线的平均可能偏差仅为0.016 mm,脱水率为92.19%。0.2 mm筛缝弧形筛回收粗精煤泥比0.4 mm弧形筛提高了20%,浮选入料上限控制为0.15 mm,入浮煤泥量减少了近1/4。

For avoiding the trouble of re-washing the already up-to-the standard cleaned fine coal slime, comparative parallel industrial tests are made with 2 clean coal slime sieve bends. One bend has an aperture size of 0.2 mm and the other, 0.4 ram, and they are all fitted with pneumatic strikers. Test result indicates that the bend with a smaller aperture size works with an efficiency as high as 85.66% , 16.85 percentage points higher than that of the bend with larger openings, a partition size of 0. 152 ram, a mean probable deviation of distribution curve of only 0. 016 mm, a moisture removal rate of 92.19% , and recovery rate of coarse clean coal slimes nearly 20% higher as compared with the bend of 0.4 mm version. Through the use of the bend of the 0.2 mm version, the flotation feed is controlled at a top-size limit of 0.15 mm and the load of flotation circuit is reduced by approximately one quarter.