| 摘要 |
PROBLEM TO BE SOLVED: To provide a recycling method of a concrete mass which can be inexpensively and easily carried out by enabling the use of the concrete mass generated by breaking an established concrete structure etc. for a landfill while preventing elution of hexavalent chromium. SOLUTION: The recycling method of the concrete mass consists of pulverizing the concrete mass to particle diameter of under 40 mm, mixing a reduction agent containing calcium sulfite with this pulverized material by a stoichiometric amount required for reducing hexavalent chromium in the pulverized material to trivalent chromium, or more, and using the pulverized material mixed with the reduction agent for the landfill. A desulfurization reaction product mainly containing calcium sulfite, which is by-produced in an exhaust-gas desulfurization apparatus, can be used as the reduction agent. COPYRIGHT: (C)2007,JPO&INPIT
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