种分过程超声强化的影响
( 中南大学 化学化工学院， 长沙 410083)
摘 要: 用相同频率和输入功率的超声波对不同Na2Ok浓度和αk的铝酸钠溶液进行处理， 通过对恒温种分过程中相同反应时间的分解率和粒度分布特点的比较，发现在超声波作用条件相同的情况下， 超声波对铝酸钠溶液的强化作用随着铝酸钠溶液苛性碱浓度的降低而加强， 且超声波对αk为1.55时的铝酸钠溶液的强化作用较其他αk的强。 通过对不同Na2Ok浓度和αk条件下铝酸钠溶液表面张力系数的测定及超声波声致荧光影像的研究，初步探讨了溶液物理性质对超声强化作用和超声空化作用的影响及超声波作用的机理。
关键字: 铝酸钠溶液； 超声； 空化作用； 声致荧光
enhancement during precipitation process
（ College of Chemistry and Chemical Engineering,
Central South University, Changsha 410083, China）
Abstract: The decomposition fraction and the particle size distribution during the precipitation process of sodium aluminate solution under different conditions with and without ultrasound were compared respectively. The experiments results indicate that while the conditions of ultrasound being kept constant, the ultrasonic effect on the precipitation process is enhanced as the concentration of sodium aluminate is reduced, and it is more significant at medium αk. The effect of physical properties of sodium aluminate on ultrasonic enhancement on the precipitation process and ultrasonic cavitation was further investigated by the detection of surface tension coefficient and image of Luminol sonofluorescence.
Key words: sodium aluminate solution; ultrasound; cavitation; sonofluorescent
