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The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 mol/kg H2O
Wei Zhang; Li Zhou; Hongfeng Tang; Heping Li; Wenlei Song; GangXie
2017
发表期刊Applied Geochemistry
卷号82页码:79-88
摘要

The solubility of fluorite in hydrothermal conditions is important in ore forming and geothermal processes and groundwater utilization. However, a quantitative description of the geochemical behavior of fluorite under hydrothermal conditions has not been previously reported. In this work, the solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 M was determined by experiments and modeling. The solubility products obtained in this work at 30 and 50 °C under ambient pressure and those from literature were used to regress the density model parameters for fluorite solubility product calculation at high temperature. The Pitzer interaction model was adopted to calculate the activity coefficient. The fluorite solubility determined in KCl solution at 250 °C under vapor saturated pressure and that from the literature were combined with the low-temperature thermodynamic properties of heat capacity and osmotic coefficient to obtain the binary parameters of NaF and KF at temperatures up to 260 °C. A thermodynamic model was then developed for calculating the fluorite solubility in Na-K-Cl solution at temperatures up to 260 °C, under vapor saturated pressure and ionic strengths up to 4 M. As calculated from this model, fluorite solubility measured at 200 °C and 0.1 M NaCl was well predicted. Both temperature and ionic strength had significant effects on fluorite solubility, and fluorite exhibited a similar dissolution pattern in both NaCl and KCl solution. When the concentration was lower than 2 M, the solubility of fluorite first increased with temperature, reached a maximum at approximately 100 °C, and then decreased. When the concentration was higher than 2 M, the solubility of fluorite increased monotonically with temperature.

关键词Fluorite Solubility hydrothermal Condition high Temperature pitzer Model
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/8433
专题地球内部物质高温高压实验室
地球深部物质与流体作用地球化学研究室
作者单位1.Institute for Ecological Civilization of Karst Area, Guizhou Normal University, Guiyang 550001, China
2.Key Laboratory of High-temperature and High-pressure Study of the Earth's Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
3.Department of Geology and Pedology, Mendel University in Brno, Brno 61300, Czech Republic
4.Central European Institute of Technology, Brno University of Technology, Brno 61200, Czech Republic
5.University of Chinese Academy of Sciences, Beijing 100039, China
推荐引用方式
GB/T 7714
Wei Zhang,Li Zhou,Hongfeng Tang,et al. The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 mol/kg H2O[J]. Applied Geochemistry,2017,82:79-88.
APA Wei Zhang,Li Zhou,Hongfeng Tang,Heping Li,Wenlei Song,&GangXie.(2017).The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 mol/kg H2O.Applied Geochemistry,82,79-88.
MLA Wei Zhang,et al."The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 °C and ionic strengths up to 4 mol/kg H2O".Applied Geochemistry 82(2017):79-88.
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