The invention discloses a multi-
metal recycling method of electric furnace
tin-
smelting dust. The method comprises the following steps: electric furnace
tin-
smelting dust is placed in a reaction kettle,
sulfuric acid or / and
raffinate are added to perform neutral leaching so that metals such as
zinc are leached in the neutral solution and
indium,
tin and lead are left in residues; the neutral residues are placed in a reaction kettle, concentrated
sulfuric acid is added for cure leaching, cleaning solution is added after the reaction to ensure that
indium and a part of tin are leached in the solution and most of tin and lead are left in residues; extractant P204 is used to extract the
indium and tin of the
leachate and separate indium and tin from
zinc,
hydrochloric acid is used to perform backextraction to the extract so that tin and indium can be separated from the organic phase through backextraction and
high concentration indium-tin mixed backextraction solution can be obtained;
tributyl phosphate (TBP) extractant is used to extract tin to obtain material solution with indium and material solution with tin; and the material solution with indium is replaced by using a
zinc plate and casted to obtain crude indium, the crude indium is electrolyzed and purified to obtain a refined indium product. The method combines the mature concentrated acid curing technology, extraction technology and other technologies into a whole, solves the
separation problem of indium and tin and ensures that various high-value metals in the electric furnace dust can be recycled efficiently, continuously and largely; and the actual indium yield is more than 80% and the purity of the refined indium is more than 99.93%.