METHOD AND APPARATUS FOR REUSING MOLDING SAND AND WATER-SOLUBLE INORGANIC SALT BINDER

PROBLEM TO BE SOLVED: To provide a method for almost fully reusing molding sand and water-soluble inorganic salt binder from a water-soluble core, and an apparatus used in this method. SOLUTION: The apparatus for reusing the molding sand and the water-soluble inorganic salt binder, includes: a sand dropping device 1 for removing the molding sand by using water pressure from a casting using a water-soluble core with the water-soluble inorganic salt binder covered on the surface of the molding sand grain; a device 2 for injecting the water-soluble inorganic binder water solution to this sand-dropping device from the following solution buffering vessel through a circulating pump; a sand depositing vessel 3 which is arranged below the the sand dropping device and stores the removed molding sand and mixture composed of the water-soluble inorganic salt binder and the water, for depositing the molding sand; a solution buffering vessel 4 which communicates with the upper part of the sand depositing vessel and stores the water-soluble inorganic salt binder aqueous solution separated from the molding sand; and a dehydrating device 5 which communicates with the lower part of this sand depositing vessel, dehydrates slurry composed of the molding sand, the water-soluble inorganic salt binder and the water to a prescribed concentration, and sends kneaded sand into a molding machine. COPYRIGHT: (C)2005,JPO&NCIPI