粘土科学 = Journal of the Clay Science Society of Japan (in Japanese)
巻
40
号
4
ページ
218 - 228
発行年
2001-05-21
ISSN
0470-6455
NCID
AA1155672X
DOI
10.11362/jcssjnendokagaku1961.40.218
出版者
日本粘土学会 = The Clay Science Society of Japan
抄録
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 on using slaked lime (calcium hydroxides: Ca (OH) 2). Core samples were collected at disposal pond to which treated wastewater flows. Mineral assemblages and chemical compositions of core samples were analyzed. 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 87-90cm of core samples. Scanning Electron Microscopy (SEM)-Energy Dispersive X-ray analyses (EDX) and Electron Probe Micro Analyzer (EPMA) show that heavy metals, such as, Fe, Mn, Cu and Zn are concentrated in calcite, gypsum, ettringite, and clay minerals. The results indicate that heavy metals in wastewater are mineralogically fixed in solid phases of calcite, gypsum, ettringite and smectite.
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
SC-PR-TAZAKI-K-218.pdf
(13.21MB)
