Existing forms of tungsten in hydrothermal solutions and forming conditions of scheelite |
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| Authors: | Wan Jiamin |
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| Institution: | 1. Institute of Geochemistry, Academia Sinica, USA
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| Abstract: | Experiments on the solubility of WO3 in HCl and KCl solutions at 200°C show that tungsten cannot migrate in the form of chloride in solutions. In Cl-rich hydrothermal solutions of moderate salinity, tungsten migrates mainly as alkali salts of HWO 4 ? and WO 4 2? . Determination of the solubility of WO3 in HF and KHF2 solutions at 100–300°C shows that tungsten migrates steadily as WO3F? and WO2F 3 ? in F-rich hydrothermal solutions. Experiments and thermodynamic calculations also indicate that silico-wolframic acid, polymeric wolframic acid and sulfoxy wolframic acid cannot extensively occur in hydrothermal solutions. In addition, the physicochemical conditions of formation of scheelite are also discussed in the present paper. |
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