Effect of 20kHz ultrasound on alumina hydrate precipitation from seeded sodium aluminate solution

来源期刊：中国有色金属学报(英文版)2002年第6期

论文作者：赵继华 陈启元

文章页码：1203 - 1205

Key words：ultrasound; alumina hydrate; induction time; agglomeration; crystal growth

Abstract: The effect of 20kHz ultrasound on alumina hydrate precipitation from seeded sodium aluminate solution was studied. Compared with alumina hydrate precipitation without treatment of ultrasound, the precipitation time is reduced from 30h to 15h when the precipitation ratio is 45% under 20kHz ultrasound. Furthermore, agglomeration is increased and the growth rate of alumina hydrate is increased under 20kHz ultrasound by comparing the crystal size distribution and the SEM photographs. As a result, the average size of alumina hydrate is increased by 3.7μm. The structure of product is not changed according to the results of X-ray powder deflection.