萤石的溶解度模型及其对稀土元素迁移的影响

打开文本图片集
中图分类号:P592 文献标识码:A 文章编号:2097-5465(2025)03-0022-08
Abstract:A solubility model for fluorite in water,NaCl,and CaCl2 solutions is developed based on the thermodynamic theory, usingthechemicalpotentialofwaterasthefoundation.Themodelcanbeusedtocalculatethesolubilityoffluoriteinwater,NaCl solutions,and CaCl2 aqueous solutions.Additionally,the model can also be applied to calculate the solubility offluorite in NaCl and CaCl2 aqueoussolutions.The overall averagerelative deviation for these systemsis close toor below the measurement uncertainty,andthemodelauatelyreproducesmostof theexistingexperimentaldata.Thestandardmolarenthalpyofforation (20 ΔfHe(T0) and standard molar entropy Se(T0) for the dissolution of CaF2(M(aq) )calculated by this model are-2939.0115kJ·mol−1and 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.
Keywords:fluoritesolubility;model;aqueoussolution;REEmobility
来稿日期:2025-04-06 DOI:10.13937/j.cnki.hbdzdxxb.2025.03.004
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);河北地质大学博士科研启动基金项目(BQ2024082)
作者简介:吴娅月(1999—),女,河北石家庄人,硕士研究生,研究方向为应用数学。(剩余11609字)