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An experimental study of the solubility and speciation of tungsten in NaCl-bearing aqueous solutions at 250, 300, and 350 °C
Xin-Song Wang;  Alexander Timofeev;  A. E. Williams-Jones;  Lin-Bo Shang;  Xian-Wu Bi
2019
发表期刊Geochimica et Cosmochimica Acta
卷号265页码:313-329
摘要

The solubility of tungsten trioxide solid and the speciation of tungsten in NaCl-bearing solutions have been investigated through experiments conducted at 250, 300, and 350 °C under vapour-saturated water pressure. Based on the results of these experiments, the solubility of tungsten trioxide was controlled by temperature and pH, whereas the NaCl concentration did not affect the solubility except through its influence on the ionic strength of the solution. Two tungsten species were found to be present in the solutions, namely H2WO40 at low pH and HWO4 at higher pH. These two species formed via the reactions WO3 + H2O = H2WO40 and WO3 + H2O = HWO4 + H+, respectively. The logarithms of the equilibrium constants for these reactions are −5.18 ± 0.26, −4.97 ± 0.25, −4.69 ± 0.10, and −7.91 ± 0.30, −7.67 ± 0.29, −7.52 ± 0.18 for 250, 300, and 350 °C, respectively. In addition, the logarithms of the first and second association constants of H2WO40 were determined to be 2.72, 2.71, 2.83, and 5.59, 6.49, 8.07 for 250, 300, and 350 °C, respectively. These values indicate that H2WO40 is only important at low pH values (<2.8), and that HWO4 is the dominant tungsten species at pH conditions commonly encountered in nature. The data obtained in this study were used to model the solubility of scheelite and ferberite. This modeling indicates that tungsten concentrations are highest at high temperature in solutions with high salinity, low contents of calcium and iron, and either very low or high pH. The opposite is true for tungsten mineral precipitation from a fluid.

关键词Tungsten Solubility And speciation Tungsten Mineralization hydrothermal Systems formation Constants
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/10401
专题矿床地球化学国家重点实验室
作者单位1.An experimental study of the solubility and speciation of tungsten in NaCl-bearing aqueous solutions at 250, 300, and 350 °C
2.Department of Earth & Planetary Sciences, McGill University, 3450 University Street, Montreal, QC H3A 0E8, Canada
推荐引用方式
GB/T 7714
Xin-Song Wang;Alexander Timofeev;A. E. Williams-Jones;Lin-Bo Shang;Xian-Wu Bi. An experimental study of the solubility and speciation of tungsten in NaCl-bearing aqueous solutions at 250, 300, and 350 °C[J]. Geochimica et Cosmochimica Acta,2019,265:313-329.
APA Xin-Song Wang;Alexander Timofeev;A. E. Williams-Jones;Lin-Bo Shang;Xian-Wu Bi.(2019).An experimental study of the solubility and speciation of tungsten in NaCl-bearing aqueous solutions at 250, 300, and 350 °C.Geochimica et Cosmochimica Acta,265,313-329.
MLA Xin-Song Wang;Alexander Timofeev;A. E. Williams-Jones;Lin-Bo Shang;Xian-Wu Bi."An experimental study of the solubility and speciation of tungsten in NaCl-bearing aqueous solutions at 250, 300, and 350 °C".Geochimica et Cosmochimica Acta 265(2019):313-329.
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