化工进展2016，Vol.35Issue(8)：2350-2354,5.DOI:10.16085/j.issn.1000-6613.2016.08.07
碳酸锂在水中的溶解度和超溶解度的测定及热力学分析
Measurement and thermodynamic analysis of the solubility and supersolubility of lithium carbonate in water
宋昌斌 1李润超2
作者信息
- 1. 青海盐湖镁业有限公司，青海格尔木 816099
- 2. 北京四中，北京 100088
- 折叠
摘要
Abstract
The solubility and supersolubility determines the width of the metastable state and the crystallization process is operated in the metastable zone. Therefore,the solubility and supersolubility are an important basic data in industrial crystallization process. In this study,lithium carbonate was used as solute and the solubility of lithium carbonate in water was measured at (283.15 to 318.15) K and atmospheric pressure by using a gravimetric method. The supersolubility was measured by using a laser dynamic method. It was obviously showed that the solubility and supersolubility of lithium carbonate in water and the width of the metastable zone decreased with increasing temperature. The solubility data was correlated by Van’t Hoff equation and modified Apelblat equation. The results indicated that the solubility of calculated values was in good agreement with the experimental values. The average relative deviation of the Van’t Hoff equation and the modified Apelblat equation were 0.54% and 0.20%,respectively. The changes of enthalpy(ΔHd),entropy(ΔSd)and Gibbs free energy (ΔGd)of the dissolving process were obtained by the thermodynamic calculation. The dissolving process was a non-spontaneous process of exothermic and Entropy. The entropy change was the main influencing factor in the dissolution process.关键词
碳酸锂/水/溶解度/超溶解度/介稳区/热力学计算Key words
lithium carbonate/water/solubility/supersolubility/metastable zone/thermodynamic calculation分类
化学化工引用本文复制引用
宋昌斌,李润超..碳酸锂在水中的溶解度和超溶解度的测定及热力学分析[J].化工进展,2016,35(8):2350-2354,5.
