Solubility and thermodynamics of lithium carbonate in sodium carbonate solution

Haiwen GE; Huaiyou WANG; Min WANG

doi:10.11949/0438-1157.20190647

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Solubility and thermodynamics of lithium carbonate in sodium carbonate solution

Thermodynamics | 更新时间：2020-06-24

- Solubility and thermodynamics of lithium carbonate in sodium carbonate solution
- CIESC Journal Vol. 70, Issue 11, Pages: 4123-4130(2019)
- 作者机构：
  
  1.Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, Qinghai, China
  2.Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, Qinghai, China
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190647
  CLC： O 645.12
- Received：10 June 2019，
  
  Revised：2019-08-22，
  
  Published：05 November 2019
- 稿件说明：
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戈海文, 王怀有, 王敏. 碳酸锂在碳酸钠溶液中的溶解度与热力学[J]. 化工学报, 2019, 70(11): 4123-4130

GE Haiwen, WANG Huaiyou, WANG Min. Solubility and thermodynamics of lithium carbonate in sodium carbonate solution[J]. CIESC Journal, 2019, 70(11): 4123-4130
戈海文, 王怀有, 王敏. 碳酸锂在碳酸钠溶液中的溶解度与热力学[J]. 化工学报, 2019, 70(11): 4123-4130 DOI： 10.11949/0438-1157.20190647.

GE Haiwen, WANG Huaiyou, WANG Min. Solubility and thermodynamics of lithium carbonate in sodium carbonate solution[J]. CIESC Journal, 2019, 70(11): 4123-4130 DOI： 10.11949/0438-1157.20190647.

摘要

采用等温溶解平衡法开展碳酸锂在碳酸钠溶液中(278.15～358.15 K)的溶解平衡实验研究，测定平衡体系碳酸锂溶解度和平衡溶液密度，利用E-DH方程对碳酸锂溶解度实验数据进行关联，标准偏差小于0.01；利用Connaughton方程对液相密度数据进行关联，标准偏差小于2×10

-3

。实验和计算研究结果表明：在同离子和盐效应协同影响下，碳酸锂在Na

-H

O体系中溶解度随碳酸钠浓度增加先降低后降低趋势变缓，在278.15～358.15 K温度范围内，溶解度转变折点为碳酸钠浓度约为0.1 mol·kg

-1

；通过溶解热力学计算，得到碳酸锂在碳酸钠中的溶解焓变(Δ

)、熵变(Δ

)和Gibbs自由能变(Δ

)，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碳酸钠浓度增加而增加，Gibbs自由能变在0.6 mol·kg

-1

出现最大值，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。

Abstract

The isothermal dissolution equilibrium method was used to study the dissolution equilibrium of lithium carbonate in sodium carbonate solution (278.15—358.15 K)

the lithium carbonate solubility and density were determined

and the experimental data of lithium carbonate solubility was correlated by E-DH equation

standard deviation of calculated is less than 0.1. The Connaughton equation is used to correlate the solution density data with a standard deviation of less than 2×10

-3

. The experimental and theoretical results show that the solubility of lithium carbonate decreases first and then extremely slow decreases with the increase of sodium carbonate concentration in the temperature range of 278.15—358.15 K. Under the synergistic effect of the same ion effect and salt effect

the solubility change point is at sodium carbonate concentration of about 0.1 mol·kg

-1

. The dissolution enthalpy (Δ

)

entropy (Δ

) and Gibbs free energy (Δ

) of lithium carbonate in aqueous sodium carbonate solution were obtained by dissolution thermodynamic calculation. The results show that the dissolution process is a non-spontaneous process of exotherm and entropy reduction. The dissolution enthalpy and entropy increase with increasing sodium carbonate concentration

Gibbs free energy shows a maximum at 0.6 mol·kg

-1

and the dissolution process is an entropy controlled process. The research results will provide basic data for the design of lithium carbide precipitation process for brine.

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