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The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 degrees C and ionic strengths up to 4 mol/kg H2O
Wei Zhang;  Li Zhou;  Hongfeng Tang;  Heping Li;  Wenlei Song;  Gang Xie
2017
Source PublicationApplied Geochemistry
Volume82Pages:79-88
Abstract

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 degrees 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 degrees 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 degrees 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 degrees C. A thermodynamic model was then developed for calculating the fluorite solubility in Na-K-Cl solution at temperatures up to 260 degrees C, under vapor saturated pressure and ionic strengths up to 4 M. As calculated from this model, fluorite solubility measured at 200 degrees 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 degrees C, and then decreased. When the concentration was higher than 2 M, the solubility of fluorite increased monotonically with temperature. 

KeywordFluorite Solubility hydrothermal Condition high Temperature pitzer Model
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8096
Collection地球内部物质高温高压实验室
Affiliation1.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
Recommended Citation
GB/T 7714
Wei Zhang;Li Zhou;Hongfeng Tang;Heping Li;Wenlei Song;Gang Xie. The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 degrees 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;Gang Xie.(2017).The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 degrees C and ionic strengths up to 4 mol/kg H2O.Applied Geochemistry,82,79-88.
MLA Wei Zhang;Li Zhou;Hongfeng Tang;Heping Li;Wenlei Song;Gang Xie."The solubility of fluorite in Na-K-Cl solutions at temperatures up to 260 degrees C and ionic strengths up to 4 mol/kg H2O".Applied Geochemistry 82(2017):79-88.
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