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Évaluation environnementale et géométallurgique de minerais sulfurés polymétalliques, basée sur une approche minéralogique pluridisciplinaire

Abstract : This thesis proposes the implementation of a reliable methodology, based on the characterization of ores at the exploration stage. The main environmental issues for the mining industry are acid mine drainage and contaminated neutral drainage. Sulfides and sulfosalts, when in contact with water and oxygen, oxidize at different rates, resulting in the production of acid and release of various contaminants. Samples of pure sulfides were submitted to geochemical testing to determine their oxidation rates. The pure minerals can be ordered from the highest to the lowest reactivity as: gersdorffite > pyrrhotite > arsenopyrite > Ni-pyrite > Ni-pyrrhotite > Fe-sphalerite > pyrite > galena > chalcopyrite. Galvanic interactions between pyrite, chalcopyrite, and sphalerite were geochemically investigated. Pyrite was galvanically protected in presence of chalcopyrite, and partially protected in presence of sphalerite. Five synthetic tailings, simulating realistic tailings sulfides compositions, were prepared to compare geochemical behaviors and produce a better assessment of the acid-generation potential (AP). A new method is proposed by adding a kinetic factor. Ten polymetallic and gold sulfide ores were fully characterized with multidisciplinary techniques. Mineralogical investigations allowed for the mineralogical quantification of the ores, and for the knowledge of trace elements and their speciation. A method was developed to automatically quantify sulfides by multispectral optical microscopy. Detailed mineralogical work can save time and money and allows detecting the problems at the beginning of mining developments, improving mine waste management and mine closure planning
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https://tel.archives-ouvertes.fr/tel-01630024
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Submitted on : Tuesday, November 7, 2017 - 10:25:45 AM
Last modification on : Wednesday, November 3, 2021 - 4:55:26 AM
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  • HAL Id : tel-01630024, version 1

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Aurélie Chopard. Évaluation environnementale et géométallurgique de minerais sulfurés polymétalliques, basée sur une approche minéralogique pluridisciplinaire. Sciences de la Terre. Université de Lorraine, 2016. Français. ⟨NNT : 2016LORR0305⟩. ⟨tel-01630024⟩

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