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Hokkaido University Collection of Scholarly and Academic Papers >
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Immobilization of Lead and Zinc Leached from Mining Residual Materials in Kabwe, Zambia: Possibility of Chemical Immobilization by Dolomite, Calcined Dolomite, and Magnesium Oxide
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| Title: | Immobilization of Lead and Zinc Leached from Mining Residual Materials in Kabwe, Zambia: Possibility of Chemical Immobilization by Dolomite, Calcined Dolomite, and Magnesium Oxide |
| Authors: | Tangviroon, Pawit Browse this author | | Noto, Kenta Browse this author | | Igarashi, Toshifumi Browse this author →KAKEN DB | | Kawashima, Takeshi Browse this author | | Ito, Mayumi Browse this author →KAKEN DB | | Sato, Tsutomu Browse this author →KAKEN DB | | Mufalo, Walubita Browse this author | | Chirwa, Meki Browse this author | | Nyambe, Imasiku Browse this author | | Nakata, Hokuto Browse this author →KAKEN DB | | Nakayama, Shouta Browse this author →KAKEN DB | | Ishizuka, Mayumi Browse this author →KAKEN DB |
| Keywords: | mine waste | | contamination | | batch experiments | | lead | | zinc | | immobilization | | remediation | | Kabwe | | Zambia |
| Issue Date: | Sep-2020 |
| Publisher: | MDPI |
| Journal Title: | Minerals |
| Volume: | 10 |
| Issue: | 9 |
| Start Page: | 763 |
| Publisher DOI: | 10.3390/min10090763 |
| Abstract: | Massive amount of highly contaminated mining residual materials (MRM) has been left unattended and has leached heavy metals, particularly lead (Pb) and zinc (Zn) to the surrounding environments. Thus, the performance of three immobilizers, raw dolomite (RD), calcined dolomite (CD), and magnesium oxide (MO), was evaluated using batch experiments to determine their ability to immobilize Pb and Zn, leached from MRM. The addition of immobilizers increased the leachate pH and decreased the amounts of dissolved Pb and Zn to different extents. The performance of immobilizers to immobilize Pb and Zn followed the following trend: MO > CD > RD. pH played an important role in immobilizing Pb and Zn. Dolomite in RD could slightly raise the pH of the MRM leachate. Therefore, the addition of RD immobilized Pb and Zn via adsorption and co-precipitation, and up to 10% of RD addition did not reduce the concentrations of Pb and Zn to be lower than the effluent standards in Zambia. In contrast, the presence of magnesia in CD and MO significantly contributed to the rise of leachate pH to the value where it was sufficient to precipitate hydroxides of Pb and Zn and decrease their leaching concentrations below the regulated values. Even though MO outperformed CD, by considering the local availability of RD to produce CD, CD could be a potential immobilizer to be implemented in Zambia. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/79895 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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