種分過程超聲強(qiáng)化的影響
( 中南大學(xué) 化學(xué)化工學(xué)院， 長(zhǎng)沙 410083)
摘 要: 用相同頻率和輸入功率的超聲波對(duì)不同Na2Ok濃度和αk的鋁酸鈉溶液進(jìn)行處理， 通過對(duì)恒溫種分過程中相同反應(yīng)時(shí)間的分解率和粒度分布特點(diǎn)的比較，發(fā)現(xiàn)在超聲波作用條件相同的情況下， 超聲波對(duì)鋁酸鈉溶液的強(qiáng)化作用隨著鋁酸鈉溶液苛性堿濃度的降低而加強(qiáng)， 且超聲波對(duì)αk為1.55時(shí)的鋁酸鈉溶液的強(qiáng)化作用較其他αk的強(qiáng)。 通過對(duì)不同Na2Ok濃度和αk條件下鋁酸鈉溶液表面張力系數(shù)的測(cè)定及超聲波聲致熒光影像的研究，初步探討了溶液物理性質(zhì)對(duì)超聲強(qiáng)化作用和超聲空化作用的影響及超聲波作用的機(jī)理。
關(guān)鍵字: 鋁酸鈉溶液； 超聲； 空化作用； 聲致熒光
enhancement during precipitation process
ZHANG Ping-min, CHEN Qi-yuan
（ 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
