Treatment method of tin anode slime

The invention discloses a treatment method of tin anode slime. The treatment method comprises the following steps: transporting anode slime produced by electrolysis of crude soldering tin into a rotary kiln for oxidizing roasting; the anode mud subjected to oxidizing roasting is put into dilute sulphuric acid to be subjected to an acid leaching reaction; carrying out solid-liquid separation on the acid leaching solution by adopting plate-frame pressure filtration; mixing filter residues obtained by plate-frame pressure filtration with reducing coal, and then putting the mixture into an electric furnace for reduction smelting to obtain high-antimony crude tin; and the high-antimony crude tin is fed into a vacuum furnace to be subjected to vacuum separation, and the lead-free solder tin-silver alloy and the lead-bismuth-antimony alloy are obtained. Two impurities of Cu and Ni in the tin anode slime are removed in advance in an oxidizing roasting-dilute sulphuric acid leaching mode, a tin-silver alloy can be pro