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- W2790983454 abstract "Abstract Chalcopyrite is the main ore mineral used in industrial copper extraction. However, when passivation processes occur during hydrometallurgical treatment, a large percentage of the mineral being treated is not solubilized, so the copper recovery is limited. Galvanic interactions between semiconductor minerals are the basis of many strategies to achieve a more efficient process for increasing copper dissolution. These interactions concern generally two metallic sulfides. The present study describes a new galvanic interaction between chalcopyrite-magnetite (CuFeS 2 -Fe 3 O 4 ) in an acid microbial culture medium, used routinely in biomining processes. The electrochemical characterization of CuFeS 2 , Fe 3 O 4 and a mineral containing CuFeS 2 -Fe 3 O 4 is performed. Galvanic interactions are demonstrated by comparing Evans diagrams constructed from current transients obtained by imposing the potential pulses to each species studied. It is determined that CuFeS 2 and Fe 3 O 4 fulfil the role of anode and cathode, respectively, in the behavior of the corresponding mineral. Stripping voltammetry is used to quantify electro-dissolved ions; the electrooxidation of CuFeS 2 -Fe 3 O 4 mineral in acid culture medium releases twice as many copper ions as pure chalcopyrite. This corroborates that the galvanic interactions prevent the formation of typical passivating components observed in chalcopyrite." @default.
- W2790983454 created "2018-03-29" @default.
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- W2790983454 date "2018-03-01" @default.
- W2790983454 modified "2023-09-25" @default.
- W2790983454 title "Understanding galvanic interactions between chalcopyrite and magnetite in acid medium to improve copper (Bio)Leaching" @default.
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- W2790983454 doi "https://doi.org/10.1016/j.electacta.2018.01.169" @default.
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