Recovering metals, esp. copper, tin and iron, from scrap - esp. from scrap radiators, which are heated to melt the solder, and are then milled and fed through magnetic separators

摘要

The scrap is heated, esp. in a perforated rotary drum, to a temp. above the m.pt. of the solder joining the scrap parts together, so the solder flows out of the drum to a collection tank; the drum also exerts a milling action. The scrap is next transported by a conveyor belt to >=1 mill reducing the scrap to small metal strips, which are fed through a magnetic separator for sorting the different metals. The magnetic separators are pref. followed by a sieve removing powdered solder from the nonmagnetic metal strips. The pref. plant includes a rotary drum contg. a heater, and several feeding the scrap through two mills and onto three magnetic separators followed by a sieve. Used esp. for the sepn. of the steel frames soldered to Cu or brass tubes in scrap radiators employed to cool engines.