Reclamation of Used Sands

In the reclamation of chemically or resin bonded sands, the system employed must be able to break the bond between the resin and sand and remove the fines that are generated. The systems most commonly employed are wet washing and scrubbing for silicate bonded sands, or dry scrubbing/attrition and thermal (rotary drum or fluidized bed) systems for resin bonded sands. 

The reclamation of clay-bonded molding sand (green sand) has been practiced in Japan for the past 20 years and is currently being adopted in the United States (ASM 1988). Wet reclamation systems were employed in the 1950 s for handling clay-bonded system sands, but they are no longer utilized. 

---