Method for recovering indium in lead-silver slag through melting desulfurization-fuming indium volatilization

The invention relates to a method for recovering indium in lead-silver slag through melting desulfurization-fuming indium volatilization. The method comprises the steps that mixing the lead-silver slag with coke, drying, adding into a melting furnace, controlling conditions to perform melting desulfurization and reduction volatilization of zinc, lead and cadmium, and transferring the reacted melt into a fuming furnace; and adding coke into the fuming furnace, and controlling conditions to oxidize and volatilize indium. The flue gas is subjected to waste heat utilization and then enters respective dust collection systems to collect smoke dust; and after dust collection, the flue gas of the melting furnace is sent to an acid making system for acid making, and the flue gas of the fuming furnace is treated by an ionic liquid desulfurization device. Zinc-rich smoke dust of the melting furnace returns to a zinc hydrometallurgy system; and the indium-rich smoke dust of the fuming furnace is exported as an indium ext