Method for extracting molybdenum (VI) in water solution

The invention provides a method for extracting molybdenum (VI) in a water solution. The method mainly comprises the following steps: uniformly mixing and stirring a nonionic surfactant, a molybdenum containing water solution, a salt solution and deionized water, wherein the nonionic surfactant belongs to a Tween series and is at a concentration of 50-300g/L, the molybdenum concentration is 1-40g/L, and the salt concentration is 50-300g/L; regulating a pH value to 1-4, standing for phase separation after carrying out stirring at 25-50DEG C for 10-30min, and carrying out phase separation for 30-60 minutes so as to obtain a double-water-phase system, wherein the upper phase is a molybdenum-loaded nonionic surfactant phase, the concentration of molybdenum in the upper phase is 2-80g/L, and the lower phase is a water phase; and mixing the molybdenum-loaded nonionic surfactant phase with an ammonium sulfate water solution according to a phase ratio of 1-5, regulating the pH value to 7-10, carrying out reversed extr