Resin sand is only to resin as binder configuration type (core) sand, old sand regeneration is to maximize the removal of the surface of the sand binder film, adjust the sand surface (size) the very economy is my body with new sand. Used sand reclamation and reuse, can save Xinsha consumption and threw the old sand of transportation costs, and reclaimed sand uniform, smooth surface, good thermal stability, is conducive to improving the quality of casting, especially resin bonded sand and used sand reclamation and reuse, reduce the amount of resin, reduce the cost of resin bonded sand, but also reduce the environmental pollution caused by the discharge of waste sand.