Abstract
Two reclamation methods — a dry method and a wet method — are available which make it possible to reuse waste sand discharged from foundries in large quantities. Japan has widely adopted the dry method, in which secondarily generated wastes are easily treated and the recovered sand has a higher purity. Our Yokohama Plant, however, completed a water-washing type reclamation facility, which is equivalent to the wet method, because of the small area of land available and to minimize the initial investment. The facility reclaims the entire amount of waste sand generated in the plant, which is then reused as raw sand material for core and main molds. It has been proved that the sand recovered by the wet method, when applied to a cold box, (becoming popular in recent years), is higher in strength than new sand, although the purity of the sand recovered by this wet method is lower than that of sand recovered by a dry method.
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