Patent ID: 7328863

Claim:
A method of recycling a counterweight which was produced by using, as a filler, a metal recovered from slag generated from at least one of a blast furnace, a cupola furnace, a converter, and an electric furnace, or a metal contained in residue in a waste treatment furnace, and by using cement as a binder, wherein the method comprises: a crushing/cutting step including removing an outer shell of the used counterweight, a rough-crushing step including removing larger-sized metal portions contained in the filler from which the outer shell has been removed; a crushing/grinding step including crushing and grinding the filler from which the larger-sized metal portions have been removed, to break a combined state between the metal portion and the cement, a magnetic separation step including separating magnetic substances from the crushed and ground filler processed in the crushing/grinding step; and a specific gravity separating step including separating high-specific-gravity substances from the separated magnetic substances; and incorporating the high-specific-gravity substances as a filler in a new counterweight.