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Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier

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Title: Recovery of heavy metals from MSW molten fly ash by carrier-in-pulp method: Fe powder as carrier
Authors: Alorro, Richard Diaz Browse this author
Mitani, Shinichi Browse this author
Hiroyoshi, Naoki Browse this author →KAKEN DB
Ito, Mayumi Browse this author →KAKEN DB
Tsunekawa, Masami Browse this author
Keywords: Hydrometallurgy
Magnetic separation
Waste processing
Issue Date: Dec-2008
Publisher: Elsevier Ltd.
Journal Title: Minerals Engineering
Volume: 21
Issue: 15
Start Page: 1094
End Page: 1101
Publisher DOI: 10.1016/j.mineng.2008.02.005
Abstract: Municipal solid waste (MSW) molten fly ash is classified as a hazardous waste because it contains considerable amount of heavy metals, which pose environmental concern due to their leaching potential in landfill environments. This study proposes Carrier-in-Pulp (CIP) method as a new hydrometallurgical route to extract and recover Pb, Zn, Cu, and Cd from molten fly ash before landfilling. In this method, a carrier material, which recovers the extracted metals, is added simultaneously with fly ash to a leaching solution and is harvested from the pulp by physical separation method, such as magnetic separation or sieving. To demonstrate the effect of the CIP method, shaking flask experiments were conducted under various conditions using NaCl solution, iron powder as carrier, and molten fly ash. More than 99 wt% Pb, Zn, and Cd, and 97 wt% Cu were extracted from the ash. However, only Pb and Cu were recovered (96.3 wt% Pb and 94.3 wt% Cu) by the iron powder through cementation, leaving behind Zn and Cd ions in the solution phase. The leaching test conducted on the treated fly ash residue revealed that the CIP method suppressed the solublization of Pb to values below the landfill disposal guideline.
Type: article (author version)
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)

Submitter: Richard Diaz Alorro

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