CaMoO₄ is not only the main component of powellite, but also a key intermediate product in molybdenum metallurgy. The current leaching of CaMoO₄ is mainly in experimental and industrial research, and seldom in theoretical analysis. In this research, lgc - pH diagrams for Ca-Mo-H₂O, Ca-Mo-PO₄-H₂O, Ca-Mo-SiO₄-H₂O, Ca-Mo-CO₃-H₂O, Ca-Mo-Y(EDTA)-H₂O, and Ca-Mo-F-H₂O systems were constructed to predict the dissolution behavior of CaMoO₄ in Na₂EDTA, Na₂SiO₃, Na₃PO₄, Na₂CO₃, and NaF solutions. The diagrams suggest that CaMoO₄ can be dissolved by the five types of solutions and the solid products, for example, Ca₅(PO₄)₃OH, CaSiO₃, Ca₃Si₂O₇, CaCO₃ and CaF₂ were generated depending on the added reagent, while calcium combines with EDTA to form soluble CaY²⁻ in Na₂EDTA solution. The stability regions of CaMoO₄ and solid products are dependent on the ion concentration and pH value. Meanwhile, the proper increase of reagent concentration and pH is beneficial for raising the solubility of molybdenum. The leaching experiments of synthetic CaMoO₄ in various media indicate that CaMoO₄ can be dissolved with a high leaching efficiency which was in accord with the thermodynamic analysis. This work presents the construction of thermodynamic diagrams that is useful in the analysis of the encountered phenomena in molybdenum hydrometallurgy and provides a thermodynamic approach for treating CaMoO₄.

CaMoO ₄是鲍威尔石的主要成分，也是钼冶金的重要中间产品。_{目前对CaMoO 4}浸出的研究主要集中在实验和工业研究，很少进行理论分析。在这项研究中，lg c - Ca-Mo-H ₂ O、Ca-Mo-PO ₄ -H ₂ O、Ca-Mo-SiO ₄ -H ₂ O、Ca-Mo-CO ₃ -H ₂ O的 pH 图, Ca-Mo-Y(EDTA)-H ₂ O, 和 Ca-Mo-FH _{2 O 体系被构建来预测 CaMoO 4}在 Na ₂ EDTA, Na ₂ SiO中的溶解行为₃、Na ₃ PO ₄、Na ₂ CO ₃和NaF溶液。从图中可以看出，CaMoO ₄可以被五种溶液溶解，并生成固体产物，例如，Ca ₅ (PO ₄ ) ₃ OH、CaSiO ₃、Ca ₃ Si ₂ O ₇、CaCO ₃和CaF ₂取决于在添加的试剂上，而钙与 EDTA 结合在 Na ₂ EDTA 溶液中形成可溶性 CaY ²⁻。_{CaMoO 4}的稳定区域和固体产品取决于离子浓度和 pH 值。同时，适当提高试剂浓度和pH有利于提高钼的溶解度。_{合成CaMoO 4}在各种介质中的浸出实验表明，CaMoO ₄可以以高浸出效率溶解，这与热力学分析一致。这项工作介绍了热力学图的构造，这对分析钼湿法冶金中遇到的现象很有用，并提供了处理 CaMoO _{4 的}热力学方法。