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采用测试和回归方程求极限的方法 ,得出温度87～95℃ ,终点NH32mol/L的条件下 ,5(NH4)2O·12WO3·5H2O的平衡溶解度。5(NH4)2O·12WO3·5H2O的溶解度与温度(t)的线性关系为 :y= -588.08+7.28t,其与终点NH3 浓度(mol/L)的线性关系为 :y=36.76+18.86x。中国离子交换法所产5(NH4)2O·12WO3·5H2O溶解度较低 ,其可能原因是晶体中的Si含量较低 ,而NH4Cl含量较高 ,以及由于结晶过程NH4Cl的大量存在 ,水的活度较低 ,致使结晶产物中存在少量溶解度较低的5(NH4)2O·12WO3·7H2O
The equilibrium solubility of 5 (NH4) 2O12WO3.5H2O was obtained under the conditions of NH32mol / L and temperature 87 ~ 95 ℃ using the method of testing and regression equation. The linear relationship between the solubility of 5 (NH4) 2O12WO3 · 5H2O and temperature (t) is: y = -588.08 + 7.28t, the linear relationship between the solubility of 5 (NH4) 2O12WO3 · 5H2O and the final NH3 concentration (mol / L) is y = 36.76 + 18.86x . The low solubility of 5 (NH4) 2O12WO3.5H2O produced by the Chinese ion exchange method may be due to the lower Si content in the crystal and the higher NH4Cl content, and the high activity of water due to the large amount of NH4Cl in the crystallization process Lower, resulting in the existence of a small amount of crystalline product of the lower solubility of 5 (NH4) 2O · 12WO3 · 7H2O