E-pH diagrams of As/Sn/Pb/Cu-H2O systems were established.
Tin and arsenic were selectively extracted from tin anode slime.
92.16% Sn and 96.49% As were extracted by alkaline pressure oxidative leaching.
About 95% As was removed from the leachate as sodium arsenate hydrate.
The final solution can be used to produce sodium stannate.