| 講演要旨(和文) | | 世界的にレアメタル資源の偏在性と需要増加に伴い，これらの資源の価格が近年高騰している．また，資源の寡占化が加速することが予想されるため，資源が逼迫する際に自国で安価な資源を確保することが重要な課題となっている．このようなことから，最終処分場埋立層内のレアメタル濃集ゾーンを特定・回収することは，わが国のような資源小国にとって国家戦略といえるものである．本研究では，筆者らが以前に使用した模擬廃棄物層を用いて土槽実験を行った．探査対象物として，セメントと硫化鉄を混合した球体を層内に埋設し，電気探査IP法及び比抵抗法を用いて混合球体のIP効果を測定した．その際，通電時間を変化させることで，IP効果ならびに比抵抗への影響を検討した． |
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| | 講演要旨(英文) | | In order to identify metal-enriched zone in landfills and utilize valuable metals as urban mining, the resistivity and induced polarization measurements have been carried out as a nondestructive three-dimensional prospecting. The authors conducted some experiments for further improvement of the induced polarization measurement. In the experiments, model spheres consisting of a mixture of cement and iron sulfide, were buried in simulated landfills. We set electrodes on the surface of simulated landfills, and measured resistivity and chargeability. The measurements were carried out by changing the duration time of the polarization current, in order to obtain the proper time. As a result, it is required to lengthen the duration time of the polarization current for the purpose of grasping the IP anomaly clearly. On the other hand, the time is preferable not to be too long for grasping the resistivity structure only. Also, if the time is sufficiently long, the content ratios of iron sulfide and the specific surface area in the model spheres have a good correlation with the measured magnitude of IP effects. |
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