从理论上较全面地研究了钨矿物原料在NaOH分解过程中直接用白钨矿及其分解产物Ca(OH)₂作为抑制剂，抑制磷、砷、硅等杂质浸出的可能性及生成物的形态。进而通过实验证明在有白钨矿存在的条件下，分解所得的粗Na₂WO₄溶液中砷、硅的含量均比经典法低一个数量级，接近经典法净化以后的水平。

The Inhibition of impurities of As, P, Si and Sn in the caustic decomposition of tungsten concentrates was studied. It indicated that in the presence of scheelite (CaWO₄) and Ca(OH)₂, during caustic decomposition of sdheelite with NaOH, impurities, such as As, P, Si, will be more completely inhibited in the cake in the forms of NaCaAsO₄, Ca₃(AsO₄)₂, Ca₃(PO₄)₂，Ca₅(PO4)₃(OH)，CaSO₃ and CaSnO₃. It has been proved in laboratory experiment and industrial practice that the content of As and Si in the Na₂WO₄ solution from caustic decomposition of scheelite and wolframite mixed concentrates is only 20%〜30% of that from caus-tic decomposition of wolframite concentrates with the same contents of WO₃ and impurities.