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

1.天津科技大学 化工与材料学院,天津 300457; 2.金堆城钼业股份有限技术中心,陕西 西安710000; 3.金堆城钼业股份有限公司 化学分公司,陕西 西安 710000

二钼酸铵; 溶解度; 结晶介稳区; 成核级数

Measurement and correlation of the solid-liquid phaseequilibrium and metastable zone of the ammonium dimolybdate-ammonium-water ternary system at pH(8.5~9.0)
ZHAO Nan-nan1,WANG Yan-fei1,YANG Li-bin1,SHA Zuo-liang1,LIAN Wan1,TANG Li-xia2,LI Feng3

(1.College of Chemical Engineering and Materials Science,Tianjin University of Science and Technology,Tianjin 300457,China; 2.Technology Center of JDC Molybdenum Co.,Ltd.,Xi'an 710000,China; 3.Chemical Branch,JDC Molybdenum Co.,Ltd.,Xi'an 71000,China)

ammonium dimolybdate; solubility; crystallization metastable zone width; nucleation order

DOI: 10.13800/j.cnki.xakjdxxb.2017.0318

备注

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.