红庆梁选煤厂降低块煤入选下限的研究

通过对红庆梁邻近矿井煤质资料的分析,说明红庆梁原煤具有低灰、低硫、低磷、中高发热量的特点。根据红庆梁选煤厂原煤特性及产品方案,提出采用弛张筛对原煤进行深度筛分,有效利用重介浅槽,降低块煤洗选下限的优化思路,最终确定红庆梁选煤厂工艺流程为:原煤经弛张筛进行6 mm分级,150~6 mm入块煤重介浅槽系统洗选,出精煤和矸石产品,-6 mm末煤直接作为末煤产品销售。最后对选用工艺的技术可行性进行分析。原煤经重介浅槽分选后+13 mm灰分由13.54%降为6.38%,6~10 mm灰分由12.86%降为6.43%,说明重介浅槽分选机对13~6 mm末煤具有良好分选效果。弛张筛在谢桥选煤厂和张集北选煤厂使用效果很好,分级效率达80%以上,设备安全可靠。 The analysis of coal properties of mines near Hongqingliang coal mine shows that,the raw coal of Hongqingliang is low ash,low sulfur,low phosphorus and medium-high calorific value.Based on the coal properties and products structure,adopt flip-flop screen to separate raw coal,use dense-medium shallow-slot separator to reduce lower size of lump coal.Determine the technological process of Hongqingliang coal preparation plant.Set the classification size of flip-flop screen is 6 mm.The raw coal ranging from 150 mm to 6 mm is separated by dense-medium shallow-slot separator,the products are clean coal and gangue.The slack coal below 6 mm is sold directly.Through separation,the ash of raw coal above 13 mm decrease from 13.54 percent to 6.38 percent,which decrease from 12.86 percent to 6.43 percent while the raw coal ranging from 6 mm to 10 mm.The results show that,the dense-medium shallow-slot separator has great separation ability for 13 mm to 6 mm slack coal.The application of flip-flop screen in Xieqiao and Zhangjibei coal preparation plant is well,the classification efficiency is above 80percent