超声处理对煤泥组分沉降速度的影响

Influence of Ultrasonic Treatment on the Sedimentation Performance of Slime

这是一篇矿业工程领域的论文。高岭石与蒙脱石是煤泥中存在的主要黏土矿物,而黏土矿物是影响煤泥沉降的主要因素。本文以精煤、高岭石和蒙脱石作为研究对象,首先探索了超声强度、作用时间、超声脉冲间隔三类超声条件对其沉降效果以及絮团直径的影响,实验结果表明:当超声密度为0.4 W/cm^(3),超声作用时间为2 min时,高岭石和蒙脱石的沉降速度都得到了改善,选择合适的超声脉冲间隔时间对样品进行间断超声可以进一步提高其的沉降效果,但是超声处理反而不利于精煤沉降。将精煤、高岭石和蒙脱石试样按2∶1∶1的比例混合制样,改变超声脉冲间隔时间对其进行超声处理,结果表明:对于混合试样,未经超声处理时沉降速度为2.67 cm/min,在超声密度为0.2 W/cm^(3),超声脉冲间隔时间为4 s时作用2 min,沉降速度提高到5.41 cm/min。图像分析与电位表征显示,适当的超声脉冲间隔时间使药剂作用发挥更充分,进而双电层得到最大程度压缩,最终提高了颗粒凝聚和絮团生长效果。

This is an article in the field of mining engineering.Kaolinite and montmorillonite are the main clay minerals in coal slime,and clay minerals are the main factors affecting the sedimentation of coal slime.This paper takes clean coal,kaolinite and montmorillonite as the research objects.The influence of ultrasonic intensity,action time,and ultrasonic pulse interval on its sedimentation effect and floc diameter was investigated.The test results show that when the ultrasonic density is 0.4 W/cm^(3),when the ultrasonic action time is 2 min,the sedimentation speed of kaolinite and montmorillonite are improved.Further choosing the appropriate ultrasonic pulse interval can further improve the sedimentation effect,but ultrasonic treatment is not conducive to the clean coal settlement.Further,the clean coal,kaolinite and montmorillonite samples were mixed at a ratio of 2:1:1,and the ultrasonic pulse interval time was changed to perform ultrasonic treatment.The results showed that:for the mixed sample,it settled without ultrasonic treatment,the velocity is 2.67 cm/min.When the ultrasonic density is 0.2 W/cm^(3) and the ultrasonic pulse interval is 4 s,the settling velocity is increased to 5.41 cm/min.Image analysis and potential characterization show that the proper ultrasonic pulse interval time enables the drug to play more fully,and then the electric double layer is compressed to the greatest extent,and finally the particle agglomeration and the growth of flocs are the best.