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Experiments on the solubility of WO_3 in HCI and KCl solutions at 200℃ show that tungsten cannotmigrate 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 WO_3 in HFand KHF_2 solutions at 100-300℃ shows that tungsten migrates steadily as WO_3F~- and WO_2F_3~- in F-richhydrothermal solutions. Experiments and thermodynamic calculations also indicate that silico-wolframicacid, polymeric wolframic acid and sulfoxv wolframic acid cannot extensively occur in hydrothermalsolutions. In addition, the physicochemical conditions of formation of scheelite are also discussed in thepresent paper.
Experiments on the solubility of WO 3 in HCI and KCl solutions at 200 ° C. show that tungsten cannotmigrate 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 WO_3 in HFand KHF_2 solutions at 100-300 ° C shows that the tungsten migrates steadily as WO_3F ~ - and WO_2F_3 ~ - in F-richhydrothermal solutions. Experiments and thermodynamic calculations also indicate that silico-wolframicacid, polymeric wolframic acid and sulfoxv wolframic acid can not extensively occur in hydrothermalsolutions. In addition, the physicochemical conditions of formation of scheelite are also discussed in the present paper.