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Cover layer design based on bauxite residue for ecological restoration: A Northern climatic zone study case—geochemical phase

Cerclet Tobie, Guérin Julie Élize, Savard Véronique, Zarrougui Ramzi, Simard Marie-Christine, Côté Marie, Boucher Jean-François et Chesnaux Romain. (2023). Cover layer design based on bauxite residue for ecological restoration: A Northern climatic zone study case—geochemical phase. Dans B Abbasi, J Parshley, A Fourie et M Tibbett (dir.), Mine Closure 2023: Proceedings of the 16th International Conference on Mine Closure. (p. 1-14). Perth : Australian Centre for Geomechanics.

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The restoration of bauxite residue disposal areas (BRDA) is one of the most important environmental challenges that the aluminium industry faces. It must take into consideration several factors including country regulations and standards, social acceptability, and the climatic zones in which the industry operates. Rio Tinto operates the only alumina refinery in Canada, the Vaudreuil refinery, located in the province of Quebec. The BRDA is nearly at full capacity and will have to be reclaimed in the coming years. The overall objective of this research project is to develop a cover layer favourable to plant growth conditions for the BRDA ecological restoration. This cover should be composed of a mixture of bauxite residue (BR), inorganic and organic residual materials from local industries and woody plants native to the province. Before creating composite soils from bauxite residue, it is essential to understand the hostile environment conferred by these residues, so as to create an ecosystem in which plants and microorganisms can grow. Since each bauxite residue has its own characteristic properties, the aim of this paper is to describe the results of the first phase of the research project (acidification) for Vaudreuil BR, i.e. the behaviour of residue chemical species under different pH conditions (target pH of 5-9) using hydrochloric acid (HCl). Preliminary results of bauxite residue acidification with HCl indicate that fluoride (F-) and trace metal elements are present mostly in the solution at basic pH, and that the ideal pH for compliance with the agri-environmental standards is neutral-basic. Following these results, the challenge will then be to create fertile soil while maximizing the proportion of bauxite residue to enhance plant growth while satisfying environmental and geotechnical criteria.

Type de document:Chapitre de livre
Lieu de publication:Perth
Identifiant unique:10.36487/ACG_repo/2315_029
Sujets:Sciences naturelles et génie > Génie > Génie minier et génie géologique
Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Chimie
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées
Départements et modules > Département des sciences fondamentales
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Éditeurs:Abbasi, B
Parshley, J
Fourie, A
Tibbett, M
Mots-clés:bauxite residue, restoration, acidification, fluorine, metal element
Informations complémentaires:Document disponible gratuitement sur le site de l'éditeur. Document available free of charge on the publisher's website.
Déposé le:02 févr. 2024 00:05
Dernière modification:02 févr. 2024 12:57
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