Method for recovering molybdenum from copper smelting smoke dust

The invention discloses a method for recycling molybdenum from copper smelting smoke dust, the smoke dust contains arsenic, copper, iron, lead, zinc and molybdenum elements, the recycling method comprises the steps that S1, the smoke dust is subjected to acid leaching in acid leaching liquid, and acid leaching filtrate and lead-containing acid leaching filter residues are obtained; s2, neutralizing the acid leaching filtrate obtained in the step S1 with alkali, adding a catalyst, and oxidizing to obtain arsenic slag and filtrate after arsenic precipitation; s3, copper precipitation is conducted on the filtrate obtained after arsenic precipitation in the step S2 through a replacement method, and copper sponge precipitation and filtrate obtained after copper precipitation are obtained; and S4, a vulcanizing agent is added into the filtrate obtained after copper precipitation in the step S3, the PH value is adjusted to be smaller than 4.1 so as to trigger a vulcanization reaction, and finally molybdenum precipit