Method for extracting and separating tungsten and molybdenum from aqueous solution

The invention relates to the technical field of metallurgy, and provides a method for extracting and separating tungsten and molybdenum from an aqueous solution. According to the method, a tungsten-molybdenum mixed aqueous solution, a nonionic surfactant, a complexing agent, sodium sulfate and water are mixed, the pH value of the mixed solution is adjusted to be smaller than or equal to 3, an aqueous two-phase extraction system is obtained, an upper phase and a lower phase are obtained through stirring and standing phase splitting, the upper phase is a tungsten-rich nonionic surfactant phase, and the lower phase is a molybdenum-rich aqueous phase. Under the acidic condition, tungsten mainly exists in the form of paratungstate B anions, molybdenum exists in the form of paramolybdate ions, a hydrophilic complex is formed by the complexing agent and the paramolybdate ions, therefore, molybdenum is left in the aqueous phase, the paratungstate B anions enter the nonionic surfactant phase by means of the high hydro