唐口选煤厂中煤破碎再选工艺优化改造

Optimization of the crushed middlings rewashing process ofTangkou Coal Preparation Plant

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。

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 be⁃fore 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.