滨湖选煤厂煤泥分选与回收系统技术研究

Technical study of the fine coal cleaning and recovery system of Binhu Coal Preparation Plant

针对浮选尾煤“跑粗”,粗煤泥回收系统难以获得合格粗精煤泥等问题,滨湖选煤厂对粗精煤泥分级旋流器、高频筛、煤泥离心机和浮选柱进行了技术检查,对设备的运行效果进行了分析。结果表明:粗精煤泥分级旋流器底流灰分偏高,无法得到合格的粗精煤泥产品;高频筛脱泥效果较差,筛下“跑粗”现象比较严重;浮选入料中粗颗粒较多,浮选柱并未处在最佳运行状态。建议增加粗煤泥分选设备,将高频筛更换为叠层细筛,并在生产中严格控制浮选入料.上限,同时加强浮选柱的维护和保养工作。

The loss of coarse coal particles in flotation tailings is one of the factors causing the difficulty to obtain a low-ash clean coarse slime product through the coarse slime recovery system of Binhu Plant.To tackle the problem,following a technical checking of the clean coarse slime classifying cyclone,high-fre-quency vibrating screen,dewatering centrifuge and flotation column,an analysis is made of the operating effects of such equipment.Result of analysis shows that the underflow of the cyclone is relatively high in ash making it impossible to obtain a low-ash clean product;the high-frequency screen is low in desliming efficiency with heavy presence of unretained oversize particles in screen underflow;and the flotation col-umn is rendered unable to operate in an optimal state because of the high proportion of coarse particles in feed.It is proposed to add coarse slime cleaning equipment,switch to the use of stacked high-frequency vibrating fine screen in place of the existing high-frequency screen,exercise stricter control of flotation feed,and strengthen flotation column maintenance management.