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- W2247339810 abstract "Hydrometallurgy may be an alternative to the currently practiced smelting process forcopper extraction from chalcopyrite (CuFeS₂). However, the low temperaturehydrometallurgical processes for chalcopyrite continue to face challenges, mostly relating totheir slow dissolution rates or high sulfuric acid production. The slow dissolution rate of themineral is strongly linked to the formation of the passive film on its surface. However,despite 40 years of research on this topic, there is still not a complete agreement betweenresearchers about the composition and stability of chalcopyrite’s passive film in sulfuric acidsolutions. In this work, the nature of chalcopyrite’s passive film and its stability were studiedby application of a variety of electrochemical techniques. Additionally, the electrochemicalresults of the chalcopyrite study were compared to those obtained for a pyrrhotite electrode(Fe₁₋xS), as pyrrhotite electrochemistry represents a simplified case of the chalcopyritesystem. X-ray photoelectron spectroscopy (XPS) was used to analyze the composition of theproduct layers formed on the surface.It is shown that the chalcopyrite electrode is passive for potentials up to 0.90 VSHE.Above this potential, transpassive dissolution occurs. Results of XPS studies have suggestedthat a metal-deficient sulfide film (Cu₁₋xFe₁₋yS₂₋z) is the most plausible copper and ironcontaining sulfide phase which passivates the surface of chalcopyrite. In addition, an outerlayer of iron oxyhydroxide (FeOOH) forms on the passive film. FeOOH forms via oxidationof the passive film’s ferrous sulfide phases. The thickness of the sulfide passive film wascalculated to be approximately 6.7 nm. It is demonstrated that the transpassive dissolution ofchalcopyrite is significantly linked to oxidation of sulfur (from sulfide in the passive film toelemental sulfur and maybe sulfur species with higher oxidation states, e.g. thiosulfate). Noelemental sulfur or polysulfide species were detected on the surface for potentials below 0.90VSHE." @default.
- W2247339810 created "2016-06-24" @default.
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- W2247339810 date "2012-01-01" @default.
- W2247339810 modified "2023-09-23" @default.
- W2247339810 title "The surface chemistry of chalcopyrite during electrochemical dissolution" @default.
- W2247339810 doi "https://doi.org/10.14288/1.0072933" @default.
- W2247339810 hasPublicationYear "2012" @default.
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