青龙寺选煤厂优化设计

Transformation of coal preparation process for Qinglongsi coal preparation plant

通过青龙寺矿区煤质特征分析、筛分和浮沉实验资料分析以及可选性评定,确定了选煤厂产品结构。选煤厂入洗上限为50 mm,入洗下限为0.25 mm,经粗煤泥分选和细煤泥干燥的研究,最终确定工艺流程为50～0 mm原煤采用无压给料三产品重介旋流器分选;1.5～0.25 mm的粗精煤和粗中矸煤分别回收后掺入精煤和中煤;-0.25 mm细粒煤采用加压过滤机及压滤机联合脱水,脱水后细煤泥可直接掺入中煤或矸石,也可部分或全部进入干燥系统干燥,干燥后的煤泥掺入中煤。此优化设计工艺系统与原地面工艺系统方案相比优势显著。

The products structure of Qinglongsi coal preparation plant is established by analysing coal quality of Qinglongsi mining area,screening and float-and-sink data,washability evaluation.The higher and lower limit of separation is 50 mm and 0.25 mm.After transformation,50 to 0 mm raw coal is separated by non-pressure three-product dense medium cyclone.For 1.5 to 0.25 mm coarse clean coal and coarse middlings,first recycle,then mix into clean coal or middlings,-0.25 mm fine coal is dehydrated by pressure filter.After dehydration,the fine slime can be mixed into middlings or gangue,another handing method is that,first dry part or whole fine slime,then mix into middlings.The results show that,the optimization design has great advantages.