STABILITY OF SUPERSATURATED SILICA IN SODIUM ALUMINATE SOLUTION

ZHANG Yifei; ZHENG Shili; ZHANG Yi

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STABILITY OF SUPERSATURATED SILICA IN SODIUM ALUMINATE SOLUTION

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- STABILITY OF SUPERSATURATED SILICA IN SODIUM ALUMINATE SOLUTION
- CIESC Journal Issue 5, Pages: 695-698(2004)
- 作者机构：
  
  中国科学院过程工程研究所,北京,100080
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Online First：25 May 2004，
  
  Published：25 May 2004
- 稿件说明：
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ZHANG Yifei, ZHENG Shili, ZHANG Yi. STABILITY OF SUPERSATURATED SILICA IN SODIUM ALUMINATE SOLUTION[J]. CIESC Journal, 2004, (5): 695-698.
DOI：

ZHANG Yifei, ZHENG Shili, ZHANG Yi. STABILITY OF SUPERSATURATED SILICA IN SODIUM ALUMINATE SOLUTION[J]. CIESC Journal, 2004, (5): 695-698. DOI：

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.

Abstract

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.

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