河北地质大学学报2025，Vol.48Issue(3)：22-29,8.DOI:10.13937/j.cnki.hbdzdxxb.2025.03.004
萤石的溶解度模型及其对稀土元素迁移的影响
Fluorite Solubility Model and Its Impact on Rare Earth Element Migration
摘要
Abstract
A solubility model for fluorite in water,NaCl,and CaCl2 solutions is developed based on the thermodynamic theory,using the chemical potential of water as the foundation.The model can be used to calculate the solubility of fluorite in water,NaCl solutions,and CaCl2 aqueous solutions.Additionally,the model can also be applied to calculate the solubility of fluorite in NaCl and CaCl2 aqueous solutions.The overall average relative deviation for these systems is close to or below the measurement uncertainty,and the model accurately reproduces most of the existing experimental data.The standard molar enthalpy of formation ΔfH(ø)(T0)and standard molar entropy S(ø)(T0)for the dissolution of CaF2(M(aq))calculated by this model are-2 939.011 5 kJ·mol-1 and 597.21 J·mol-1·K-1,respectively.The results demonstrate that under lower crustal and upper mantle conditions,the high solubility of fluorine in H2O and H2O-NaCl systems can significantly enhance the mobilization of rare earth elements(REE)through the formation of fluorine-bearing complexes.关键词
萤石溶解度/模型/水溶液/稀土元素迁移Key words
fluorite solubility/model/aqueous solution/REE mobility分类
地质学引用本文复制引用
吴娅月,史训立..萤石的溶解度模型及其对稀土元素迁移的影响[J].河北地质大学学报,2025,48(3):22-29,8.基金项目
河北省教育厅高等学校科学技术研究重点项目(ZD2020165) （ZD2020165）
河北地质大学博士科研启动基金项目(BQ2024082) （BQ2024082）
