硬质高岭石(岩)的功率超声剥片及作用机理

Power ultrasonic peelling of hard kaolinite(rock) and its mechanism

先制备了符合功率超声剥片需要的煤系高岭石样品,再选定不同高岭石浓度、超声作用体积和超声时间进行了高岭石超声剥片试验。探讨了剥片过程中的高岭石浓度、超声作用体积和时间等因素对高岭石剥片的影响,发现只有选取合适的浓度、体积和作用时间才能得到理想的剥片效果。对超声剥片机理进行理论分析,给出了空化阀值压力PB、液体表面张力、空化气泡崩溃时的瞬态压力和瞬态温度等的数值关系。

The preparation of kaolinite samples of coal measures needed to meet the using of power ul- trasonic peelling is made at first. Then, the peelling tests by power ultrasonic were taken under the various condition of concentration of kaolinite, the surry volume and the action time. The factors which influence peelling of kaolinite such as concentration of kaolinite in the peelling process, the surry volume and action time were discussed. It shows that in order to obtain the desired peelling re- suits, we should select the appropriate parameters of concentration, surry volume and action time. Theoretical analysis of power ultrasonic peelling mechanism were made, and the relationships among cavitation threshold pressure PB, liquid surface tension , the transient pressure when the collapse of the cavitation bubbles, transient temperature and so on were presented.