文献类型：期刊文献

英文题名：Solubility of LiOHH2O in KOH Solutions from 333.15 to 353.15 K: Pitzer Modeling and Optimized Evaporative Crystallization for Lithium Recovery

作者：Zhao, Yu-Fei[1];Chen, Zhuo-Fan[1];Jiang, You-Fa[1];Yang, Ying[1,2];Liu, Cheng-Lin[1,2]

机构：[1]East China Univ Sci & Technol, Natl Engn Res Ctr Integrated Utilizat Salt Lake, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Joint Int Lab Potassium & Lithium Strateg Resource, Shanghai 200237, Peoples R China

年份：2026

外文期刊名：JOURNAL OF CHEMICAL AND ENGINEERING DATA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001686361000001)】；

基金：This work was supported by National Key R&D Program of China (2023YFB4103502) and Major Demonstration Projects for Science and Technology Innovation of Inner Mongolia (2025ZDSF0002).

语种：英文

摘要：Lithium hydroxide monohydrate (LiOHH2O) is a critical alkaline lithium salt for battery applications. The solubility behavior of LiOHH2O in KOH solutions and its evaporative crystallization process were systematically investigated in this study. Solubility was measured from 333.15 to 353.15 K, and a Pitzer model was developed for this system, demonstrating an excellent correlation with the experimental data. In the LiOH-KOH-H2O ternary system, LiOHH2O solubility increased with temperature but decreased with KOH concentration at fixed temperatures. During evaporative crystallization experiments, the effects of mixing intensity of the solution, heat-transfer temperature difference, evaporation temperature, and mother-liquor KOH concentration on both the purity of LiOHH2O and lithium recovery rate were systematically examined. Optimized conditions (evaporation temperature: 343.15 K, heat-transfer temperature difference: 15.0 K, stirring rate: 300 rpm, and KOH concentration in mother liquor: 30 wt %) yielded a lithium recovery rate of 55.6% and product purity of 98.3%. This study provides thermodynamic insights and process guidelines for the efficient separation and purification of lithium hydroxide from alkaline solutions.