Abstract:As one of the main products of the melting of electronic waste fire method,Copper ( Cu - Ni - Sn - Fe is rich )in many kinds of precious metals, and the efficient separation of the Ni, Sn and other elements is the key. Based on alkaline slag system carried out oxidation oxidation de-tin research, according to the results of thermodynamic analysis, the effects of oxygen consumption and excess coefficient of slagging on the removal rate and separation efficiency were studied. The mechanism of the reaction was studied. The results show that the use of alkaline slagging agent is beneficial to reduce the activity of SnO2 in slag, promote the oxidation of tin and inhibit the oxidative dissolution of copper and nickel. When the oxygen partial pressure reaches 10-5atm ,3-4 times the amount of slagging agent under the conditions of metal removal and separation to achieve the best. Tin removal rate of 90%, Sn-Cu separation factor of 8.5 or so.