鉱山廃水の消石灰処理後の鉱物化作用と重金属の取り込み

概要

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Heavy metals in sediments after treatment of mine wastewater from Ogoya Mine, Ishikawa Prefecture,Japan, was mineralogically investigated. Acidic wastewater (pH 3.5) which flows out from pithead,contains high concentration of heavy metals. In this mine, neutralizing coagulation treatment is going onusing slaked lime (calcium hydroxides: Ca(OH)_2). Core samples were collected at disposal pond to whichtreated wastewater flows. Mineral assemblages and chemical compositions of core samples wereanalyzed. X-ray powder diffraction (XRD) analyses indicate that upper parts of cores are rich in calcite,whereas deeper parts of cores are rich in gypsum and ettringite. Smectite with heavy metals are found in 87-90 cm of core samples. Scanning Electron Microscopy (SEM)-Energy Dispersive X-ray analyses (EDX) andElectron Probe Micro Analyzer (EPMA) show that heavy metals, such as, Fe, Mn, Cu and Zn areconcentrated in calcite, gypsum, ettringite, and clay minerals. The results indicate that heavy metals inwastewater are mineralogically fixed in solid phases of calcite, gypsum, ettringite and smectite.Key words: heavy metals, slaked lime, calcite, gypsum, ettringite, smectite mine drainage.
日本粘土学会の論文
2001-05-21