脱介弧形筛的工艺效果分析
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摘要
梗阳选煤厂对精煤、中煤脱介弧形筛的工业性试验检测表明,对于小于2 mm的煤粒磁性物脱除率分别达96. 81%和96. 57%,全粒级脱水率分别为95. 47%和96. 00%,小于0. 25 mm粒级脱泥率分别为95. 77%和95. 87%,说明弧形筛在介质回收系统中对脱介、泄水、脱泥都起到了关键作用;建议在保证弧形筛处理能力的前提下减小分级粒度,尽可能多回收0. 5～0. 25 mm粒级物料,避免重复分选和不必要的粗煤泥循环。
The industrial tests of the medium draining sieve bends of clean coal and middlings were carried out in Gengyang Coal Preparation Plant. The following process results were obtained. For the-2 mm clean coal and the-2 mm middlings,the magnetics removal rates were 96. 81% and96. 57% respectively. For clean coal and middlings, the dewatering rate is 95. 47% and 96. 00% respectively. The desliming rate for the-0. 25 mm clean coal and the-0. 25 mm middling are 95. 77% and 95. 87% respectively. It shows that the sieve bends are very important for medium draining,dewatering and desliming in the medium recovery system.However,the recovery of 0. 50 ～ 0. 25 mm coarse slime which has been effectively separated is not good,and correspondingly the coarse slime is returned to heavy medium cyclone and separated again.
The industrial tests of the medium draining sieve bends of clean coal and middlings were carried out in Gengyang Coal Preparation Plant. The following process results were obtained. For the-2 mm clean coal and the-2 mm middlings,the magnetics removal rates were 96. 81% and96. 57% respectively. For clean coal and middlings, the dewatering rate is 95. 47% and 96. 00% respectively. The desliming rate for the-0. 25 mm clean coal and the-0. 25 mm middling are 95. 77% and 95. 87% respectively. It shows that the sieve bends are very important for medium draining,dewatering and desliming in the medium recovery system.However,the recovery of 0. 50 ～ 0. 25 mm coarse slime which has been effectively separated is not good,and correspondingly the coarse slime is returned to heavy medium cyclone and separated again.
引文
[1]煤用筛分设备工艺性能评定方法[S]. GB/T 15716—2005.
[2]选煤厂脱水设备工艺效果评定方法[S]. MT/T 1995—2006.
[3]选煤术语[S]. GB/T 7186—2008.
[4]选煤厂技术检查[S]. MT/T 808—1999.
[5]选煤磁选设备工艺效果评定方法[S]. MT/T 816—2011.
[2]选煤厂脱水设备工艺效果评定方法[S]. MT/T 1995—2006.
[3]选煤术语[S]. GB/T 7186—2008.
[4]选煤厂技术检查[S]. MT/T 808—1999.
[5]选煤磁选设备工艺效果评定方法[S]. MT/T 816—2011.