Plant and method for reconditioning green foundry sand

Details Plant and method for reconditioning green foundry sand Plant and method for reconditioning green foundry sand

B - Operations, Transporting

22

C

22/190

B22C 5/00 (2006.01) B22C 5/18 (2006.01)

Patent

CA 2021419

ABSTRACT PLANT AND METHOD FOR RECONDITIONING GREEN FOUNDRY SAND Green sand having a residuum of retained clay is reconditioned by screening and predrying it to about zero moisture; calcining the sand to burn off organic matter; cooling the sand; mechanically scrubbing the cooled sand to free mechanically bonded clay and a portion of the clay magnetically adhered to the sand; mixing an acid/water solution with the sand to react with the remaining magnetically adhered clay to permit such clay to break free from the sand; drying the sand to release the freed clay; and extracting the thus- released clay from the sand.

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