一种硬质高岭岩剥片实验研究

A peeling experiment of hard kaolinite

以醋酸钾作为插层剂制备高岭石-醋酸钾复合体,高岭石层间距从0.714nm增大到1.42nm,夹层率为80%。利用复合体的结构不稳定性,进行功率超声剥片。讨论了在一定功率超声场中,浆液体积、浆液浓度和超声时间对剥片作用的影响。实验结果表明:在输入功率为150W、变幅杆断面直径100mm、超声频率为18kHz的条件下,浆液体积为200mL、浆液浓度为10%、超声时间为15min时超声剥片的效果最佳。声空化作用产生的冲击波、质点产生的巨大加速度是引起高岭石-醋酸钾插层复合体顺层剥离的根本原因。在声空化作用下,浆液中高岭石颗粒间的高速碰撞使其颗粒进一步变细。

Using potassium acetate as intercalation reagent, the kaolinite- potassium acetate complex was prepared. The basal spacing of raw kaolinite enlarged from 0. 714nm to 1.42nm and its intercalation ratio was about 80%. The power ultrasonic peeling test was taken with instability of kaolinite - potassium acetate complex. The effects of surry volume, surry concentration and processing time on peeling were discussed under certain power ultrasonic circumstance. It is shows that the best peeling result was got in 200 mL surry volume, 10% surry concentration and 15 min processing time under the power ultrasonic condition of 150W, 18kHz and with 100 mm end diameter of horn. That the fluid shock wave and the enomaous particle acceleration generated by acoustic cavitation is a fundamental cause for peeling of kaolinite - potassium acetate complex. Also, high velocity impact among kaolinite particles in fluid makes much more fine power.