浮选尾煤再选技术研究现状及分析

Technical research status and analysis of flotation tailings reselection

尾煤浮选是炼焦煤充分回收的重要途径,然而浮选尾煤再选回收有一定难度。系统分析归纳了当前浮选尾煤再选的方法主要包括油团聚、重选、浮选以及重选-浮选联合的方法,主要为直接回收和解离+二次分选的技术模式。油团聚法适用于细粒煤泥分选,采用废弃植物油成本低且绿色环保,但尚未广泛应用;重选法回收浮选尾煤主要通过设备联合再选回收粗粒煤泥,回收得到的煤灰分相对较高,多掺入中煤销售;重选-浮选联合法主要为分级后粗粒煤泥重选、细粒煤泥浮选,有效降低灰分精煤,但回收成本相对高;浮选法涉及影响因素较多因而回收浮选尾煤存在更多可能性,加强对浮选尾煤表面性质的研究有助于确定合理高效的回收方法,超声波、等离子体处理煤泥或捕收剂的新方法为再选浮选尾煤提供了新思路。

The washing rate of coking coal has increased obviously,which can ensure its full utilization from the source,and using resource from the flotation tailings has become an important way to fully recover coking coal.But it is difficult to recollect flotation tailings.The methods of flotation tailings reselection in current mainly include oil agglomeration,gravity separation,flotation and combination of gravity separation and flotation,and the technical mode of direct recovery and separation with secondary separation was mainly presented.The oil agglomeration method is suitable for fine coal slime separation.The waste vegetable oil has low cost and environmental friendly,but it has not been widely used.The recovery of flotation tailings coal by heavy separation method is mainly through joint equipment to recover coarse coal slime.The recovered coal ash content is relatively high,so more Chinese coal is mixed into the sales in practical application.The combined method of gravity separation and flotation is mainly used for coarse coal slime and fine coal slime after classification,which can effectively reduce the ash cleaned coal,but the recovery cost is relatively high.Flotation process which involves many factors and therefore recovery of coal flotation tail has more possibilities.It′s helpful to determine the reasonable and efficient recycling method to strengthen the research of flotation tailings surface properties.Ultrasonic,plasma processing coal slime or collectors for reelection flotation tailings provides a new train of thought.