Tin Extraction Process from Silver Separating Residue
Received:February 28, 2016  Revised:March 03, 2016
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KeyWord:silver separating residue; roasting; water leaching; stannic oxide
Wang Qiu-yu 南昌大学 化学学院
Cai Hu 南昌大学 化学学院
He Qiang 江西铜业集团公司
Han Ya-li 江西铜业集团公司
Hu Yi-wen 江西铜业集团公司
Wang Ri 江西铜业集团公司
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      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%.