低阶煤浮选工艺研究

Study on flotation technology of low rank coal

布尔台选煤厂由于原煤含矸率高,矸石极易泥化,造成煤泥水沉降处理困难,严重制约着末煤系统入选能力。针对布尔台区域原煤性质,采用中国矿业大学最新研发的专有低阶煤煤泥浮选捕收剂和旋流-静态微泡浮选柱对布尔台选煤厂进行煤泥浮选,通过分析浮选精煤性质,研究优质低灰细粒精煤未来高附加值开发利用的可能途径。布尔台煤矿半工业试验表明,捕收剂耗量2. 5~3. 0 kg/t时可实现较好的煤泥浮选效果,浮选精煤灰分为7. 30%、尾矿灰分为78. 55%,精煤可燃体回收率可达89. 13%。煤泥经浮选降灰提质后,矿物组成少、粒度细,发热量大幅提高,不仅可作为动力燃煤发电使用,还可作为优质煤化工原料,煤泥用途拓宽,利用价值增加。

Because of high gangue content of raw coal,the gangue in Buertai coal preparation plant is easy to slime,which makes coal slurry water difficult to settle and seriously restricts the capacity of final coal system.Aiming at the properties of raw coal in Buertai area,the slurry flotation was carried out by using newly developed special low rank slurry flotation collector and cyclone-static micro-bubble flotation column which belong to China University of Mining and Technology.By analyzing the properties of flotation clean coal,the possible ways of high-quality low-ash fine-grained coal development and utilization in the future were studied.The semi-industrial test shows that the better flotation effect can obtained with clean coal ash of 7.30%,tailings ash of 78.55% and recovery of combustible product of 89.13%,when the collector consumption is 2.5-3.0 kg/t.coal slurry has less mineral composition,finer particle size and higher calorific value after flotation.It can be used not only as power coal for power generation,but also as high-quality coal chemical raw material.The use of coal slurry has been broadened,and its utilization value has increased.