Abstract:Tin was extracted from silver separating residue applying the process composed of alkali fusion, water leaching, lead removal, and tin separation. The effects of NaOH dasoge, roasting temperature, and roasting time on leaching rates of Sn and Pb were investigated. The results show that leaching rate of Sn and Pb is 90% and 85% above respectively under the optimum conditions including mass ratio of NaOH to slag of 0.8, temperature of 500 ℃, and time of 90 min. Leaching solution was treated by lead removal with sodium sulfide and tin separation with lime with lead removal rate of 99.9%, and tin separation is 97.6%. Lead sulfide residue meets the first level standard of lead concentrates (YST 319-2013). Stannic oxide meets the national standard (GB/T 26013-2010) with recovery rate of tin of 87.8%.