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Biodegradable acids for pyrite depression and green flotation separation–an overview
Department of Mining and Metallurgical Engineering, Yazd University, Yazd, Iran.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0002-2265-6321
2023 (English)In: Critical reviews in biotechnology, ISSN 0738-8551, E-ISSN 1549-7801Article, review/survey (Refereed) Epub ahead of print
Abstract [en]

Exponential increasing demands for base metals have made meaningful processing of their quite low-grade (>1%) resources. Froth flotation is the most important physicochemical pretreatment technique for processing low-grade sulfide ores. In other words, flotation separation can effectively upgrade finely liberated base metal sulfides based on their surface properties. Various sulfide surface characters can be modified by flotation surfactants (collectors, activators, depressants, pH regulators, frothers, etc.). However, these reagents are mostly toxic. Therefore, using biodegradable flotation reagents would be essential for a green transition of ore treatment plants, while flotation circuits deal with massive volumes of water and materials. Pyrite, the most abundant sulfide mineral, is frequently associated with valuable minerals as a troublesome gangue. It causes severe technical and environmental difficulties. Thus, pyrite should be removed early in the beneficiation process to minimize its problematic issues. Recently, conventional inorganic pyrite depressants (such as cyanide, lime, and sulfur-oxy compounds) have been successfully assisted or even replaced with eco-friendly and green reagents (including polysaccharide-based substances and biodegradable acids). Yet, no comprehensive review is specified on the biodegradable acid depression reagents (such as tannic, lactic, humic acids, etc.) for pyrite removal through flotation separation. This study has comprehensively reviewed the previously conducted investigations in this area and provides suggestions for future assessments and developments. This robust review has systematically explored depression performance, various adsorption mechanisms, and aspects of these reagents on pyrite surfaces. Furthermore, factors affecting their efficiency were analyzed, and gaps within each area were highlighted.

Place, publisher, year, edition, pages
Taylor & Francis, 2023.
Keywords [en]
adsorption mechanisms, biodegradable acids, green flotation, Pyrite
National Category
Metallurgy and Metallic Materials Mineral and Mine Engineering
Research subject
Mineral Processing; Centre - Centre for Advanced Mining & Metallurgy (CAMM)
Identifiers
URN: urn:nbn:se:ltu:diva-101221DOI: 10.1080/07388551.2023.2238885ISI: 001051928000001PubMedID: 37599429Scopus ID: 2-s2.0-85168531070OAI: oai:DiVA.org:ltu-101221DiVA, id: diva2:1794549
Note

Funder: Center  of  Advanced  Mining  and  Metallurgy (CAMM3), Luleå University of Technology

Available from: 2023-09-06 Created: 2023-09-06 Last updated: 2023-09-06

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Chehreh Chelgani, Saeed

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