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A sulfuric-phosphoric acid leaching process for scheelite was developed. In the process, tungsten exists as a soluble phosphotungstic acid in the leachate. Thus, extracting tungsten from the solution is necessary. Considering the advantages of solvent extraction with oxygen-containing solvents, 2-octanol and tri-butyl phosphate (TBP) were employed to extract tungsten from phosphotungstic-sulfuric...
Water activity for the binary H2SO4–H2O and H3PO4–H2O systems, as well as the ternary H2SO4–H3PO4–H2O system has been measured using an isopiestic method at 298.15 K. The results for binary systems obtained in this work agree well with literature data. The results show that the isopiestic composition lines of the H2SO4–H3PO4–H2O system obey Zdanovskii’s rule at low concentrations, whereas at higher...
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