Method for separating vanadium and molybdenum from vanadium molybdenum acid liquid

The invention provides a method for separating vanadium and molybdenum from a vanadium molybdenum acid solution, which comprises the following steps: (1) mixing a reducing agent with the vanadium molybdenum acid solution to obtain a mixed solution; (2) mixing organic amine with the mixed solution obtained in the step (1), and filtering to obtain a vanadium-containing solution and a molybdenum-containing complex precipitate; (3) mixing an alkaline solution with the molybdenum-containing complex precipitate obtained in the step (2), and filtering to obtain molybdenum-containing precipitate and organic amine; the molecular structure of the organic amine in the step (2) comprises at least two nitrogen-containing groups. According to the method, vanadium and molybdenum are reduced into low valence states, and selective complexation of organic amine on metals with different valence states is utilized, so that vanadium is left in a solution, molybdenum forms precipitate in a complex form, efficient separation of van