太西氧化煤强化浮选研究

为改善氧化煤浮选效果,以太西选煤厂入选原煤中氧化煤为研究对象,通过表面特征分析,过程处理及药剂强化等方法研究改善氧化煤浮选效果的有效措施。结果表明,太西氧化煤分为风化煤、水锈煤和灭火工程煤3类,煤风化过程中,水的浸润和蒸发过程有显著影响。室内仓储可显著减缓煤炭风化作用的发生。采用表面抛光研磨可将风化煤的浮选精煤产率及可燃体回收率分别提高至75%及85%以上,且灰分小于12%;而水锈煤经过表面打磨后,浮选精煤产率与可燃体回收率分别提高至35%及45%;采用氧化柴油作为捕收剂可将氧化煤的精煤产率提高3.11%,将浮精灰分降低3.58%;对研磨后的氧化煤效果更加显著,精煤产率增至27.45%,灰分降至11.54%。因此,适当降低重选下限是强化氧化煤分选的有效途径,而表面抛光研磨处理及采用与氧化煤具有一定相似特性的氧化柴油作为浮选药剂可强化细粒氧化煤的浮选效果。 In order to improve flotation performance of oxidized coal in Taixi preparation plant in China,the effective measures were studied by the methods of surface property analysis,process and agent improvement.The results show that the Taixi oxidized coal is divided into 3 types,which are weathered coal,water-rust coal and fire extinguishing engineering coal.During weathering process of coal,water infiltration and evaporation process play a significant role.Indoor storage can significantly reduce the occurrence of coal weathering coal. The yield of concentrates of oxidized coal and the combustible recovery in flotation are increased by the surface polishing and grinding to above 75%and 85%,respectively,and the ash content is less than 12%. Besides,for the water-rust coal,after surface grinding,the yield of concentrates and combustible recovery are increased to 35% and 45%,respectively.By the use of oxidized diesel oil as collector,the yield of the concentrates of oxidized coal in flotation tests can be increased by 3.11%,while the corresponding ash content can be reduced by 3.58%.The flotation performance improvement of oxidized diesel on grinded oxidized coal is more significant,which yield of concentrates is increased to 27.45%,and the ash content is reduced to 11.54%.Therefore,proper reduction of the lower limit of gravity separation is an effective way to enhance the separation of oxidized coal,and the surface polishing and grinding treatment and the use of oxidized diesel oil with some similar surface characteristics like oxidized coal as the flotation reagents can strengthen the flotation effect of fine oxidized coal