Immobilization of Pb and Zn leached from mining residue materials in Kabwe, Zambia: Performance of calcined dolomite in column experiments

Mufalo, Walubita; Tangviroon, Pawit; Arima, Takahiko; Igarashi, Toshifumi; Ito, Mayumi; Sato, Tsutomu; Noto, Kenta; Kawashima, Takeshi; Nyambe, Imasiku; Nakata, Hokuto; Nakayama, Shouta; Ishizuka, Mayumi

Immobilization of Pb and Zn leached from mining residue materials in Kabwe, Zambia: Performance of calcined dolomite in column experiments

Mufalo, Walubita; Tangviroon, Pawit; Arima, Takahiko et al.

Journal of geochemical exploration, 2023, 249, 107209

Permalink : https://hdl.handle.net/2115/94337

このアイテムのアクセス数:137件（2026-10-11 18:59 集計）

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アクセス権	open access
URI	https://hdl.handle.net/2115/94337
タイトル	Immobilization of Pb and Zn leached from mining residue materials in Kabwe, Zambia: Performance of calcined dolomite in column experiments
著者	Mufalo, Walubita ; Tangviroon, Pawit ; Arima, Takahiko ; Igarashi, Toshifumi ; Ito, Mayumi ; Sato, Tsutomu ; Noto, Kenta ; Kawashima, Takeshi ; Nyambe, Imasiku ; Nakata, Hokuto ; Nakayama, Shouta ; Ishizuka, Mayumi
著者名 Mufalo, Walubita
著者名 Tangviroon, Pawit
著者名 Arima, Takahiko
e-Rad_Researcher 90301944 著者名 Igarashi, Toshifumi
e-Rad_Researcher 10339690 著者名 Ito, Mayumi
e-Rad_Researcher 10313636 著者名 Sato, Tsutomu
著者名 Noto, Kenta
著者名 Kawashima, Takeshi
著者名 Nyambe, Imasiku
e-Rad_Researcher 60815273 著者名 Nakata, Hokuto
e-Rad_Researcher 90647629 著者名 Nakayama, Shouta
e-Rad_Researcher 50332474 著者名 Ishizuka, Mayumi
言語	英語
キーワード	Mine wastes
	Column experiments
	Lead
	Zinc
	Immobilization
	Zambia
発行日	2023-06
出版者	Elsevier
収録物名	Journal of geochemical exploration
巻(号)	249
ページ	107209
抄録	Legacy Pb-Zn mine in Kabwe, Zambia, has left massive stockpiles of mining residue materials (MRM) that contain potentially toxic elements, such as lead (Pb) and zinc (Zn), which pollute the environment. In situ remediation of the contaminated area is an attractive technique for immobilizing hazardous metals. In this study, the efficacy of modified dolomite, i.e., calcined dolomite (CD), was evaluated by mixing with the MRM at 1, 5, and 10 % ratios (CD1, CD5, and CD10, respectively). The leaching of hazardous metals, Pb and Zn, from the MRM was assessed by four-column experiments. Measurements of mineralogical and chemical constituents of the MRM, sequential extraction, and thermodynamic modeling of the leachates were carried out to determine the attenuation mechanisms. Sequential extraction results indicated that the leachable Pb and Zn in the MRM were mainly from the exchangeable and carbonate fractions. Furthermore, the results showed that the effluents from the column with MRM (CD0) exceeded the Zambian effluent regulatory values throughout 30 weeks of the experimental period. The introduction of the CD into the MRM increased effluent pH and decreased the leaching concentrations of Pb and Zn. The CD5 was enough to decrease the leaching concentrations of both hazardous metals below the Zambian effluent standard by prohibiting the release of Pb and Zn via the dissolution of carbonate minerals and retaining them in the carbonate fraction. The saturation indices of Pb and Zn suggest that the retention mechanisms by the CD accredit to precipitation, co-precipitation, and adsorption reactions. These results present an effective and inexpensive immobilization technology for hazardous wastes in abandoned mines.
資源タイプ	学術雑誌論文
出版タイプ	Accepted Manuscript
権利情報	Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
権利情報	© <2023>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	0375-6742
関連情報 (isVersionOf)	出版社版DOI https://doi.org/10.1016/j.gexplo.2023.107209