pH值在8.5～9.0之间的二钼酸铵-氨-水三元体系固液相平衡及介稳区的测定与关联

摘要

采用静态平衡法测定了pH值在8.5 ～9.0之间的二钼酸铵-氨-水三元体系固液相平衡及介稳区,分别用Apelblat简化方程和λh方程对相平衡数据进行关联,结果表明,2种模型关联标准方差分别为1.626％和1.661％.同时,采用浊度法测定了二钼酸铵的结晶介稳区数据,考察了降温速率对介稳区的影响,推导出二钼酸铵在氨水体系中的结晶成核级数.%In this paper,an static equilibrium method is used to study Ammonium Dimolybdate-ammonium-water ternary system of solid liquid phase equilibrium and metastable zone at a certain pH (8.5 ～9.0).The experimental data were correlated by the modified Apelblat and λh equation,respectively.The results show that two models associated standard deviation were 1.626％ and 1.661％,respectively.The metastable zone width,which was used for optimizing the operational conditions with different cooling rate,of the ammonium dimolybdate was measured by the nephelometry.Then the nucleation order of the ammonium dimolybdate can be calculated by the classic nucleation theory.