ADSORPTION AND CO-PRECIPITATION BEHAVIOR OF FLUORIDE ONTO MG-BEARING MINERALS IN SI-AL-MG MINERAL SYSTEM AT HYPERALKALINE CONDITIONS

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概要

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• Fluoride leaching from alkaline solid compounds especially from steel slag and coal fly ash which are currently utilized in construction has been considered a potential threat to public health and the environment. In hyperalkaline environments, it is difficult to remove fluoride from geomedia since most of the naturally-occurring minerals are negatively charged. To prevent fluoride leaching, it is necessary to identify stable secondary mineral phases where control of the pore water chemistry could be possible, and that can be generated and act as sorbing solids for fluoride under highly alkaline conditions in the further utilization or when dumping these alkaline solids as landfill. In this study, mineral phases synthesized in Si-Al-Mg systems under hyperalkaline conditions at room temperature were investigated. Fluoride co-precipitation and adsorption experiments were conducted to study the characteristics of the fluoride sorption by these minerals during and after mineral precipitation. The results showed that brucite, high Mg-containing hydrotalcite-like phases (HT), and smectite have high fluoride removal efficiency. Fluoride removal efficiency was much higher in co-precipitation experiments than in adsorption experiments. The mechanism of the fluoride removal was studied with FT-IR measurements, XRD analysis, and zeta potential determinations, and indicated that fluoride can be structurally fixed via ion exchange during and after the mineral formation. Hence, this study demonstrates that the leachability of fluoride at alkaline conditions can be minimized by incorporation into the structure of Mg containing minerals. Generation of Mg-containing minerals as the sorption sink for fluoride by controlling the pore water chemistry of alkaline solid compounds with high reactivity must be taken into account in the utilization and disposal of alkaline solid compounds.

著者

• Xiaoji Liu

  Laboratory Of Environmental Geology Graduate School Of Engineering Hokkaido University

• Opiso Einstine

  Laboratory Of Environmental Geology Graduate School Of Engineering Hokkaido University

• Sato Tsutomu

  Hokkaido University

• Sato Tsutomu

  Laboratory Of Bioscience Faculty Of Engineering Iwate University

• Yoneda Tetsuro

  Hokkaido University

• Yoneda Tetsuro

  Laboratory Of Environmental Geology Division Of Sustainable Resources Engineering Graduate School Of Engineering Hokkaido University

• LIU XIAOJI

  Laboratory of Environmental Geology, Division of Sustainable Resources Engineering, Graduate School of Engineering, Hokkaido University

• OPISO EINSTINE

  Geoenvironmental Engineering Group, College of Engineering, Central Mindanao University

• Opiso Einstine

  Geoenvironmental Engineering Group College Of Engineering Central Mindanao University

関連論文

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• ARSENIC REMOVAL FROM SYNTHETIC GROUNDWATER BY CAMBODIAN LATERITE
• B15 Fluoride sorption onto granulated blast furnace slag and coal fly ash with addition of MgO
• ADSORPTION AND CO-PRECIPITATION BEHAVIOR OF FLUORIDE ONTO MG-BEARING MINERALS IN SI-AL-MG MINERAL SYSTEM AT HYPERALKALINE CONDITIONS
• ADSORPTION AND CO-PRECIPITATION BEHAVIOR OF FLUORIDE ONTO MG-BEARING MINERALS IN SI-AL-MG MINERAL SYSTEM AT HYPERALKALINE CONDITIONS

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