Solubility of ammonium paratungstate in the system NH3 • H2O-H2O

被引：0
|
作者：
Wan, LS [1 ]
Xu, ZF [1 ]
Shi, ZL [1 ]
机构：
[1] So Inst Met, Fac Mat & Chem Engn, Ganzhou 341000, Peoples R China
来源：
RARE METALS | 2003年 / 22卷 / 01期
关键词：
hydrometallurgy; ammonium paratungstate (APT); regressive analysis; solubility;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The equilibrium solubilities of 5(NH4)O . 12WO(3) . 5H(2)O (APT . 5H(2)O) were determined at the terminal ammonia concentration of 2 mol/L at 87-95degreesC. Experimental data were regressed. The linear functional relation between the solubility of APT . 5H(2)O and the temperature (t / degreesC) is given as y = -588.08 + 7.28t. The solubility of the species as a function of the terminal ammonia concentration (x / mol . L-1) is also achieved: y = 36.76 + 18.86x. The solubility of APT . 5H(2)O produced by ion-exchange method in China is much lower, which is due to much lower silica, much higher NH4Cl, and a small amount of APT . 7H(2)O with low solubility in the APT crystals. APT . 7H(2)O forms because of a large amount of NH4Cl and the low activity of water in the crystallization.
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页码：10 / +
页数：5
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