磷酸钠与白钨矿的反应平衡常数很大，可用来分解白钨矿。但由于缺乏对该体系的热力学研究，使得分解过程中的反常现象难以解释；由于缺乏对浸出机理的深入了解，使得原本趋势很大的反应，仍需在高温高压的极端条件下进行。为此，在热力学方面，本项目拟通过研究Na3PO4和Na2WO4分别在NaO-P2O5-WO3-H2O系的溶解结晶平衡，并与Na3PO4分解CaWO4的反应平衡和Na2WO4分解Ca3(PO4)2的反应平衡相耦合，建立CaO-Na2O-P2O5-H2O系的多相平衡理论，阐明Na3PO4和Na2WO4交互作用机理，并为白钨矿的工艺优化提供理论依据。在浸出机理方面，通过对比研究在无、有超声波作用下的浸出机理变化，并研究超声波对反应物的活化效应，对产物层的剥离效应、微观结构影响，来阐明超声波强化浸出机理，为实现白钨矿的高效、低能耗浸出提供理论和技术支撑。

Scheelite concentrate can be digested efficiently by Na3PO4 because of its large reaction equilibrium constant. However，the abnormal phenomenon in the scheelite concentrate decomposition process is still confused，and the scheelite concentrate decomposition must be performed under high temperatuer and high pressure conditions. For these reasons，we shall research the phase equilibrium of NaO-P2O5-WO3-H2O system，and study the chemical reaction balances of Na3PO4 digesting CaWO4 and Na2WO4 leaching Ca3(PO4)2.Bashed on these research mentioned above，the phase equilibrium of CaO-Na2O-P2O5-H2O system can be achieved to explain the interaction of Na3PO4 and Na2WO4 and provide theoretical basis for scheelite digesting process optimization. For leaching mechanism of scheelite concentrates decompostition，the kinetics will be investigeted in the presence of ultrasonic wave. The activation mechanism of scheelite concentrates、the stripped effect of products and the morphology of products in the presence of ultrasonic wave will also be invested. The results can provide theoretical basis and technical support for scheelite concentrates decomposition with low energy consumption.