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本文用Meissner公式、Bromley公式、Chen公式、Pitier公式及经作者改进的平均球近似(MSA)方法对锂盐水溶液(最大浓度达20mol/kg)的离子平均活度系数进行了计算和比较,结果表明改进后的MSA方法的计算精度最高。另外,本文还应用改进的MSA法,使用由单一电解质水溶液离子平均活度系数得到的参数,不用任何混合参数,预测了298.15k时LiCl+Li2SO4和LiCl+KCl水溶液的等温溶解度图.其结果与文献实验值基本一致。
In this paper, the average ion activity coefficients of lithium salt solution (maximum concentration of 20mol / kg) were calculated and compared with Meissner formula, Bromley formula, Chen formula, Pitier formula and the author’s modified mean sphere approximation (MSA) It shows that the improved MSA method has the highest computational accuracy. In addition, we also use the improved MSA method to predict the isothermal solubility of LiCl + Li2SO4 and LiCl + KCl aqueous solution at 298.15k, using the parameters obtained from the average activity coefficient of ions in a single electrolyte aqueous solution without using any mixing parameters. The results are basically consistent with the experimental data.