Effect of Ultrasound Frequency on the Precipitation Process of Supersaturated Sodium Aluminate Solution  

作　　者：刘吉波 陈金清 尹周澜 张平民 陈启元 

机构地区：[1]College of Chemistryand Chemical Engineering,Central South University,Changsha,Hunan 410083,China

出　　处：《过程工程学报》2004年第2期130-135,共6页The Chinese Journal of Process Engineering

基　　金：Supported by the Key Program of National Fundamental Research Development(No. G1999064892-2);National Natural Science Foundation(No. 59874031)

摘　　要：The effects of frequency of ultrasound on the precipitation process of prepared supersaturated sodium aluminate solutions of practical concentration were studied experimentally under seeded, isothermal, batch crystallization conditions at various temperatures and initial ak(mole ratio of Na2O/Al2O3). The decomposition and the particle number percentage for size below 2 mm at time of 15 h were compared, particle size distribution and SEM photos of the product aluminum hydroxide were also analyzed. The results indicate that the ultrasonic treatment at 16 kHz can enhance the decomposition rate of sodium aluminate solutions, and also has effects on particle morphology and particle size distribution of aluminum hydroxide precipitated.The effects of frequency of ultrasound on the precipitation process of prepared supersaturated sodium aluminate solutions of practical concentration were studied experimentally under seeded, isothermal, batch crystallization conditions at various temperatures and initial ak(mole ratio of Na2O/Al2O3). The decomposition and the particle number percentage for size below 2 mm at time of 15 h were compared, particle size distribution and SEM photos of the product aluminum hydroxide were also analyzed. The results indicate that the ultrasonic treatment at 16 kHz can enhance the decomposition rate of sodium aluminate solutions, and also has effects on particle morphology and particle size distribution of aluminum hydroxide precipitated.

关 键 词：过饱和铝酸钠溶液 沉淀 超声波 频率 SEM 晶粒尺寸 形核 氧化铝 

分 类 号：TF821[冶金工程—有色金属冶金]