In order to effectively heat treat and decore a metal casting, and thereafter fully reclaim the core sand for reuse, a two-stage system processes metal castings and core sand formed of sand and binder. The two-stage system includes a first stage for removing the core sand from the metal casting while...http://www.google.com/patents/US5901775?utm_source=gb-gplus-sharePatent US5901775 - Two-stage heat treating decoring and sand reclamation system
