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Scrap metal often includes a large amount of copper and tin. It is important to recover copper and tin from this scrap metal for recycling. Separation into two liquid phases, namely Fe and Sn(-Cu) phases, has been investigated at 1523 K in Fe-Sn-B and Fe-Sn-Cu-B systems. In the Fe-Sn-B system, the tin content of the Fe-rich phase and the iron content of the Sn-rich phase are 13.7 and 11.7 mass%, respectively, when [mass%B] (in Fe) = 3.62. Boron widens the miscibility gap of the Fe-Sn binary system. The isothermal section diagram of the Fe-Sn-Cu-2.66 mass%B quaternary system at 1523 K is described. In the Fe-Sn-Cu-B system, separation into two liquid phases, Fe-rich and [Sn-Cu]-rich, is found over all ratios of [mass%Sn]/[mass%Cu]. The separation region is enlarged as the [mass%Sn]/[mass%Cu] ratio is decreased. By using the separation into two liquid phases, iron can be enriched in the Fe-rich phase and copper and tin can be enriched in the [Sn-Cu]-rich phase. It is possible to recover copper and tin effectively from Fe-Sn-Cu alloy.

Separation of Fe and Sn&ndash;Cu Phases in an Fe&ndash;Sn&ndash;Cu&ndash;B System

Separation of Fe and Sn–Cu Phases in an Fe–Sn–Cu–B System