Selective recovery of Sn from copper alloy dross and its heat-treatment for synthesis of SnO2

Preliminary study on concentration and separation of tin (Sn) from copper alloy dross by selective dissolution method was conducted. The tin in the copper alloy dross did not dissolve in an aqueous nitric acid solution which could allow separation of tin from the copper alloy dross. The tin as H2SnO3 (metastannic acid) phase was precipitated in the solution with centrifuging process and transformed to tin dioxide (SnO2) after drying process. The dried sample was heat-treated at low temperature and its phase characteristics, surface morphology and chemical composition were investigated.