Laboratory study on the effectiveness of limestone and cementitious industrial products for acid mine drainage remediation


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Output type: Journal article

UM6P affiliated Publication?: Yes

Author list: Elghali A., Benzaazoua M., Bouzahzah H., Bussière B.

Publisher: MDPI

Publication year: 2021

Journal: Minerals (2075-163X)

Volume number: 11

Issue number: 4

ISSN: 2075-163X

eISSN: 2075-163X

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85104032434&doi=10.3390%2fmin11040413&partnerID=40&md5=4171627932fa24c3141bd34db2b02d87

Languages: English (EN-GB)


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Abstract

Acid mine tailings may affect several environmental matrices. Here, we aimed to stabilize acid‐generated mine tailings using several alkaline and cementitious amendments, which were tested in columns for 361 days. The alkaline amendments consisted of 10 and 20 wt.% limestone, while the cementitious amendments consisted of different binders at a total dosage of 5 wt.% binder. The different formulations for the cementitious amendments were: 50% Kruger fly ash and 50% class F fly ash; 20% ordinary Portland cement, 40% Kruger fly ash, and 40% class F fly ash; 80% ordinary Portland cement and 20% Kruger fly ash; and 20% ordinary Portland cement, 40% Kruger fly ash, and 40% fly ash. Kinetic testing on the amendment formulations showed that the pH values increased from <2.5 to circumneutral values (~7.5). The mobility of various chemical species was greatly reduced. Cumulative Fe released from the unamended tailings was ~342.5 mg/kg, and was <22 mg/kg for the amended tailings. The main mechanisms responsible for metal(loid) immobilization were the precipitation of secondary phases, such as Fe‐oxyhydroxides, physical trapping, and tailing impermeabilization. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.


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Last updated on 2021-23-11 at 23:21