微细粒煤间断浓缩沉降试验研究

Experimental study on discontinuous concentration and sedimentation of fine coal

为确定微细粒煤泥高效浓缩的最佳操作参数,提出了一种新方法实现煤泥连续浓缩的预测与优化,借助沉降量筒与澄清水质量浓度测量装置确定一定单位面积处理量下煤泥浓缩沉降最佳药剂添加量、入料质量浓度和流量,并预测出该条件下的浓缩效率。试验结果表明:随着质量浓度的增大,单位质量最佳药剂消耗量增加,微细颗粒等速沉降速度基本不变,单位面积处理量一定的情况下,压缩区高度降低速度ν基本不变;在20.66 g/(dm2·min)单位面积处理量下,入料质量浓度50 g/L,药剂添加量11 mg/L,入料流量0.083 L/min时,可达到最佳浓缩效率89.05%;随着浓缩时间增加,浓缩效率都不断增加并逐渐达到饱和;当单位处理量小时,低质量浓度浓缩效果较好,但处理量较大时,较高质量浓度较低流量配合更具优势。

In order to obtain the optimal operation parameters of fine coal continuous concentration,a new method combining a sediment cylinder and a device for measuring clarified water concentration was put forward to predict and optimize the coal slurry continuous concentration process. The best flocculants dosage,feed concentration and rate of flow and its final concentration efficiency in a certain capacity were achieved by the discontinuous concentration test. The test results show that the optimal flocculants consumption increases with the feed concentration. However,the speed of fine particle constant-velocity sedimentation remains unchanged. The best concentration efficiency can reach 89. 05%with the feed concentration 50 g / L,reagent dosage 11 mg / L,a feed rate of flow 0. 083 L / min when the handling capacity is 20. 66 g /( dm2·min). With the concentration time increases,the concentration efficiency is gradually improved and reaches its saturation point. The lower concentration,the better effect when the handling capacity is small.The high concentration with low flow rate shows a greater advantage with a large capacity.