Field investigations and laboratory simulation of clogging in Lixi tailings dam of Jinduicheng,China |
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Authors: | Jun Wu Yanqing Wu Jian Lu Leonora Lee |
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Institution: | (1) School of Environmental Science and Engineering, Shanghai Jiao Tong University, Dongchuan Rd 800, Shanghai, 200240, China |
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Abstract: | Clogging is one of the most important factors affecting the stability of the tailings dams. Firstly, this work investigates
the clogging materials of Lixi tailings dam using ICP-AES, X-ray powder diffraction (XRD) and SEM analysis methods. The ICP-AES
results indicate that Fe is the dominant element in the clogging materials. The iron contents of clogging samples collected
from 2# radial-well pipe and the access hole of the starter dam are 54.35 and 40.24%, respectively. XRD spectra show that
ferric hydroxide is the main initial component of the clogging materials. Other compounds such as akaganeite, hematite and
goethite are products from ferric hydroxide transformation. Therefore, the clogging materials are a mixture of ferric hydroxide
and its converted products. The clogging materials commonly exist in an amorphous form with a cluster microstructure when
viewed under SEM. Secondly, this work uses a continuous flow column to simulate clogging in the laboratory, and the clogging
materials are analyzed with XRD and SEM. The chemical analysis indicates that the iron content of the clogging materials from
the experiment is 45.43%. XRD spectra show that hematite is the only compound detected. The clogging materials generated experimentally
are also in amorphous cluster microstructure when viewed under SEM. |
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Keywords: | Tailings dam Clogging Iron compounds Experiment analysis |
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