Method for recovering tin from lead smelting low-grade tin-containing material

The invention belongs to the technical field of metal smelting, and discloses a method for recovering tin from a lead smelting low-grade tin-containing material, which comprises the following steps of: preparing lead ore powder, returned smoke dust and high-tin lead slag into a mixture, then adding coal powder, and smelting in a bottom blowing furnace to produce primary lead, smelting slag, smoke gas and smoke dust; the smelting slag flows into a reduction furnace in a liquid form to be smelted, and high-tin lead, slag and smoke dust are produced; the method comprises the following steps: melting high-tin lead to dredge slag to produce high-tin high-copper lead dross and high-tin lead liquid, and carrying out vacuum melting on the high-tin lead liquid to produce crude tin and lead liquid; fuming the furnace slag to produce high-tin secondary zinc oxide; the high-tin high-copper lead dross is subjected to reduction smelting, and high-tin lead and copper matte are produced; high-tin lead is returned to recycle