To enable recycling as casting material and to improve the yield and the productivity of a component adjusting material by crushing a metallic waste product, separating into iron pieces and casting pieces with magnetic force, disposing the iron piece on both sides of the casting pieces, pressing and manufacturing the casting material having sandwich structure.
The waste product is crushed. The magnetic flux density surrounding the crushed material is made larger with a secondary magnetic separation than that with a primary magnetic separation, and the iron pieces are separated with the primary magnetic separation and the casting pieces are separated with the secondary magnetic separation and the remainders are separated with the non-ferrous pieces. The cast iron pieces separated with the primary magnetic separation are separated with sizes and the casting pieces having a prescribed size or larger are charged into a melting furnace as it is, and the casting pieces having a prescribed size or smaller are pressed together with the iron pieces and made to block and charged into the melting furnace. In the case of charging the casting pieces having a prescibed size or smaller as it is into the melting furnace, the pieces are blown up with the rising hot blast. The wt. ratio of the iron pieces 4 contained in the casting material is made to be ≥60%.
YONEKAWA TETSUSHI
OGAWA YOSHIHIRO
OKADA TAKASHI
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