Reclamation method of foundry sand

Abstract

To provide a reclamation method of foundry sand capable of suppressing deterioration in strength of core after remanufacturing. A reclamation method of foundry sand includes: a preparation step for preparing foundry sand to which a binder is adhered; a washing step for washing the foundry sand prepared in the preparation step; a polishing step for polishing the foundry sand washed in the washing step; and rinsing step for rinsing the foundry sand polished in the polishing step.

What is claimed is: 
     
         1 . A reclamation method of foundry sand, comprising:
 preparing foundry sand to which a binder is adhered;   washing the prepared foundry sand;   polishing the washed foundry sand; and   rinsing the polished foundry sand.   
     
     
         2 . The reclamation method of foundry sand according to foundry sand according to  claim 1 , wherein the foundry sand is polished by agitating the foundry sand in contact with a solvent and rubbing the foundry sand against each other. 
     
     
         3 . The reclamation method of foundry sand according to  claim 2 , wherein the amount of solvent is 4 to 20 mass % of the foundry sand that has been washed. 
     
     
         4 . The reclamation method foundry sand according to  claim 2 , wherein the solvent is water. 
     
     
         5 . The reclamation method of foundry sand according to  claim 2 , wherein agitating is performed at an agitation speed of 1 to 12 m/s in polishing the foundry sand.