硼酸在氯化钙溶液中溶解度的测定与关联

采用静态平衡法测定了298.15～343.15 K时硼酸在不同浓度的氯化钙溶液中的溶解度,并用Apelblat方程、经验方程、λh方程对实验数据进行关联。结果表明:硼酸溶解度随着氯化钙浓度的增加而减小,随温度的升高而增加;上述3种模型均可用于氯化钙溶液中硼酸溶解度与温度的关系,其中Apelblat方程和经验方程的拟合相关系数均在0.99以上,λh方程的拟合系数在0.98以上。硼酸在氯化钙溶液中溶解度的测定与关联为硼酸在氯化钙溶液中冷却结晶以及分离提纯提供了重要的固液相平衡数据,对卤水沉淀法提硼工艺研究具有重要意义。

Determination and correlation of solubility of boric acid in calcium chloride solution

The solubility of boric acid in calcium chloride solution with different concentration was determined by the static equilibrium method in the temperature range at 298.15~343.15 K.The experimental data was correlated by Apelblat equation,empirical equation and λh equation.The results showed that the solubility of boric acid decreased with the increase of calcium chloride concentration and increased with the increase of temperature.The above three kinds of models could be used for the relationship between the solubility of boric acid and temperature in calcium chloride solution.The fitting correlation coefficients of the Apelblat equation and the empirical equation were both above 0.99,and the fitting coefficient of the λh equation was above 0.98.The determination and correlation of boric acid solubility in calcium chloride solution provided important solid liquid equilibrium data for the cool crystallization and separated purification of boric acid in calcium chloride solution.It was of great significance to the research of boron extraction process by halogen precipitation.