SAND RECLAMATION AND PURIFICATION

摘要

A method is disclosed for reclaiming clean sand from a sand mixture impregnated with resin. The method provided for a clean sand product having an acid demand of 15 or less without producing a sludge or waste water by-product to be discarded or treated. Additionally, a method of preparing sand molds or cores from such reclaimed sand at relatively fast cure rates is disclosed; the molds or cores are characterized by high tensile strengths.