摘要
研究了铝酸钠溶液分解条件下溶液中SiO2 稳定期与温度、氧化铝浓度、碱浓度和SiO2 过饱和度的相互关系 ,并应用结晶成核的动力学理论进一步得出了铝酸钠溶液中超溶解度的计算公式 .此式可方便地用于计算铝酸钠溶液不同水解度时所允许的溶液中最大SiO2 浓度 ,用于指导碱法生产氧化铝工艺中的脱硅和铝酸钠溶液水解操作 .
The relationship of the stability period of supersaturated silica with temperature, alumina concentration, alkali concentration and supersaturation was obtained under the hydrolysis condition. Furthermore, according to the kinetics theory of crystallized nucleation, the equation to calculate the supersolubility of silica in sodium aluminate solution was deduced as well, which correlated the supersolubility of silica with the stability period of supersaturated solute in solution. The mechanism of nucleation was also investigated through classical nucleation theory. Under the hydrolysis condition in alumina production, the nucleation mechanism was mainly heterogeneous.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2004年第5期695-698,共4页
CIESC Journal
基金
国家自然科学基金资助项目 (No 5 99740 2 7)~~
关键词
铝硅酸钠
成核
过饱和
稳定性
Alumina
Crystallization
Hydrolysis
Nucleation
Silica
Stability
