Shin Caterpillar Mitsubishi Ltd.

Hiroshi Kumamoto

Norio Nakajima

Shuichi Kataoka

The present invention provides a counterweight and a counterweight-recycling method capable of having excellent workability, capable of reducing manufacturing costs, and capable of achieving environmental conservation. A metal portion contained in slag produced in an iron making process or in residue in a waste treatment furnace is used as a weight material of a counterweight (). A method of recycling the counterweight () includes a removing step of removing an outer shell () of a used counterweight () that has used a magnetic metal portion as a weight material, a crushing/cutting step of crushing a filler containing the metal portion of the counterweight () from which the outer shell () has been removed and cutting a combined state between the metal portion and the other filler portion, and a separating step of separating processed products obtained in the crushing/cutting step into high-specific-gravity substances composed chiefly of the metal portion and into other low-specific-gravity substances, in which the high-specific-gravity substances are used as weight materials of a counterweight to be newly manufactured.

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Kitakyushu, Japan

Hiroshi Kumamoto