唐家河选煤厂煤泥水系统改造

Slime water treatment system transformation of Tangjiahe coal preparation plant

分析了唐家河选煤厂煤泥水系统工艺流程,并在此基础上进行了煤泥水采样试验研究。结果表明:中矸煤泥水灰分高于原生煤泥灰分,直接进入浓缩机会造成精煤损失,降低尾煤灰分;进入中煤和矸石段的悬浮液较多,悬浮液中-0.3 mm粒级未得到有效分选;浮选尾矿灰分高于压滤煤泥灰分;中矸浓缩旋流器溢流、中矸高频筛筛下水直接进入浓缩机是造成唐家河选煤厂尾煤灰分偏低的主要原因。通过将中矸浓缩旋流器溢流、中矸高频筛筛下水导入浮选系统,在浮选机原有一、二室通道基础上增加通过面积,即一、二室小流量短路改造,实现了尾煤灰分、精煤产率和入浮煤泥量的提高。改造后,在精煤灰分相近的情况下,唐家河选煤厂浮选尾煤灰分提高了7.28%,每年增加精煤销售收入555.98万元。

Analyse the process of slime water treatment system of Tangjiahe coal preparation plant, then conduct the slime water sampling experiment. The results show that, the ash of slime water in middlings and gangue phase is higher than that in primary slime phase. If concentrated directly by thickener, it causes clean coal loss and decreases the ash of tailings. There are lots of suspension flowing into middlings and gangue phase,-0. 3 mm size fraction in suspension can＇t be separated effectively. The ash of flotation tailings is higher than that of slime treated by pressure filter. The overflow of cyclone thickener and untreated backwater of high-frequency screen lead to low ash of tailings. Increase the ash of railings, clean coal yield and flotation slime content by diverting the flow and backwater into flotation system, increasing the area of tunnel which links the first chamber and the second chamber of flotation machine. After transformation, when the ash of clean coal basically keep stable, the ash of railings increase by 7.28 percent, the sales revenue of clean coal increase by 5.5598~106 yuan per year.