Method for separating and recycling tin and zinc in electric furnace tin smelting smoke dust

The invention discloses a method for separating and recycling tin and zinc in electric furnace tin smelting smoke dust, which comprises the following steps: adding water into the electric furnace tin smoke dust for washing and dechlorinating, and filtering to obtain dechlorinated smoke dust and filtrate; water and sulfuric acid are added into the dechlorinated smoke dust for size mixing, then oxygen pressure leaching is conducted, zinc enters a solution in the form of zinc sulfate, tin is left in residues in the form of tin dioxide, and leaching liquid and leaching residues are obtained after filtering; leach liquor is a zinc sulfate solution, the zinc sulfate solution returns to leach enriched zinc, and leaching residues are washed with water to obtain tin concentrate; precipitating zinc in the zinc-enriched liquid by adopting sodium salt, and filtering to obtain filter residues as a zinc raw material and filtrate as a sodium sulfate solution; adding the sodium sulfate solution into the seed crystal, natural