戈海文^1,2,王怀有^1,2,王敏^1,2

• 1:中国科学院青海盐湖研究所，中国科学院盐湖资源综合高效利用重点实验室，青海 西宁 810008
• 2:青海省盐湖资源化学重点实验室，青海 西宁 810008

摘要(Abstract)：

采用等温溶解平衡法测定了在温度为278.15~358.15 K时，Li₂CO₃在质量摩尔浓度为0~4.06 mol·kg^-1 NaCl溶液中的溶解度和溶液密度，利用E-DH和Apelblat方程对Li₂CO₃溶解度实验数据进行关联，计算相对偏差在±0.05以内；利用Connaughton方程对液相密度数据进行关联，标准偏差小于7×10^-4。实验和理论计算结果表明：Li₂CO₃在NaCl-H₂O体系中溶解度随NaCl浓度增加先增大后又减小，在温度278.15~358.15 K内，溶解度在NaCl质量摩尔浓度约为1 mol·kg^-1时出现最大值。通过溶解热力学计算，得到Li₂CO₃在NaCl中的溶解焓变ΔH_d、熵变ΔS_d和吉布斯自由能变ΔG_d，结果表明溶解过程为放热、熵减的非自发过程，溶解焓变和熵变随着NaCl浓度变大而增加，吉布斯自由能变ΔG_d在NaCl质量摩尔浓度为1 mol·kg^-1出现最小值，且溶解过程为熵控制过程。研究结果将为卤水提锂碳化沉锂过程设计提供基础数据。

关键词(KeyWords)： 碳酸锂;氯化钠;溶解度;关联模型;热力学计算

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金（U1507202）。

作者(Author): 戈海文^1,2,王怀有^1,2,王敏^1,2

DOI: 10.3969/j.issn.1003-9015.2020.04.001

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