唐口选煤厂中煤破碎再选工艺优化改造
Optimization of the crushed middlings rewashing process of Tangkou Coal Preparation Plant
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摘要: 针对洗选8级精煤时中煤中仍存在10级精煤的问题,唐口选煤厂通过对该中煤进行筛分浮沉试验和破碎筛分浮沉试验,研究分析了在不同破碎粒度(原生中煤、6 mm、3 mm)条件下从中煤中回收10级精煤的可行性。试验结果表明:解离度越高,越有利于精煤回收;结合精煤产率及破碎煤泥产出量两项指标,确定中煤破碎粒度为6 mm时回收效果相对较优。在此试验研究结果的基础上,通过加装分级筛与破碎机,实现了中煤破碎再选工艺优化改造,使精煤产率提高了0.56个百分点。Abstract: In producing the grade-8 clean coal by Tangkou Coal Preparation Plant, it is found that the middlings product still contains some coal that is up to the standard of the grade-10 clean coal in quality indices. To address this issue, work is made on screening and float-and-sink analysis of the middlings before and after crushing to explore the conditions required for the recovery pf the grade-10 coal from the middlings before its crushing and after it is crushed down to a size of 6 mm or 3 mm. Test result show that the higher the degree of liberation of the intergrown coal, the more conducive it is to the recovery of the coal; and when viewed from the perspective of yield of clean coal and amount of fine coal generated through crushing of middlings, a relatively higher recovery of the coal can be obtained when the middlings are crushed down to size of 6 mm. On the basis of the test results, the middlings rewashing process of the plant is optimized through addition of sizing screen and crusher, allowing the plant to see a rise of the yield of clean coal by 0.56 percentage point.