Method for extracting rhenium from molybdenum smelting flue gas

The invention discloses a method for extracting rhenium from molybdenum smelting flue gas. The method is characterized in that high-temperature flue gas generated after roasting of molybdenite is sprayed in a three-stage countercurrent circulation mode, sulfuric acid system spraying liquid is obtained after the flue gas is sprayed, nitrate ion-containing solutions pretreated by nitric acid or molybdenum calcine nitric acid are added into the spraying liquid for blending, blended liquid can be directly extracted by anion trialkylamine (N235) extraction agents, the molybdenum-rhenium separation coefficient is large, the rhenium extraction rate is high, and the organic phase can be recycled repeatedly. According to the method, the rhenium spraying and recycling problem in the high-temperature flue gas is effectively solved, a new way or a new process of extracting and recycling the rhenium from the sulfuric acid system spraying liquid is realized, the extraction procedure of a sulfuric acid system is discovered,