Kinetics of Ferric Ion Reduction on Chalcopyrite and its Influence on Leaching up to 150 °C

Yue, Guikuan; Asselin, Edouard

doi:10.1016/j.electacta.2014.08.060

Cited by 31 publications

(10 citation statements)

References 73 publications

(99 reference statements)

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“…Furthermore, in direct contradiction to the theory proposed by Crundwell and co-workers,N icol showed that the generation of photocurrent during the oxidation of these minerals in acidic sulfate solutionswas relatedtothermal effects in the semiconductive surfacef ilm and not the bulk CuFeS 2 .D espite these contradictions about the mechanism of anodic dissolution of transition-metal sulfide minerals, there is al arge consensus on the formation of am etal-deficient-sulfide layer at the surface, which likely restricts mineral dissolution. [33][34][35][36] The energy generated at the surface of CuFeS 2 during oxidation by Fe 3 + ions in the presenceo fo xygen is lost as heat. [29][30][31][32] The literature provides good insight into the possible leaching of CuFeS 2 under oxidizing conditions or by reductive conversion of CuFeS 2 into Cu 2 S, which could then be oxidizedt o Cu 2 + .T he use of Fe 3 + ions in the presence of oxygen to leach Cu 2 + from CuFeS 2 has been rigorously studied in the past.…”

Section: Introductionmentioning

confidence: 99%

“…[29][30][31][32] The literature provides good insight into the possible leaching of CuFeS 2 under oxidizing conditions or by reductive conversion of CuFeS 2 into Cu 2 S, which could then be oxidizedt o Cu 2 + .T he use of Fe 3 + ions in the presence of oxygen to leach Cu 2 + from CuFeS 2 has been rigorously studied in the past. [33][34][35][36] The energy generated at the surface of CuFeS 2 during oxidation by Fe 3 + ions in the presenceo fo xygen is lost as heat. In contrasttot he direct reduction of Fe 3 + on CuFeS 2 ,wepropose that the Fe 2 + /Fe 3 + redox reactionc ould proceed on as eparate electrode in ab attery-like cell setup.…”

Section: Introductionmentioning

confidence: 99%

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A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS₂ in a Fixed Bed Flow Cell

Deen

Asselin

2018

ChemSusChem

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The development of a hybrid system capable of storing energy and the additional benefit of Cu extraction is discussed in this work. A fixed bed flow cell (FBFC) was used in which a composite negative electrode containing CuFeS (80 wt %) and carbon black (20 wt %) in graphite felt was separated from a positive (graphite felt) electrode by a proton-exchange membrane. The anolyte (0.2 m H SO ) and catholyte (0.5 m Fe in 0.2 m H SO with or without 0.1 m Cu ) were circulated in the cell. The electrochemical activity of the Fe /Fe redox couple over graphite felt significantly improved after the addition of Cu in the catholyte. Ultimately, in the CuFeS ∥Fe /Cu (CFeCu) FBFC system, the specific capacity increased continuously to 26.4 mAh g in 500 galvanostatic charge-discharge (GCD) cycles, compared to the CuFeS ∥Fe (CFe) system (13.9 mAh g ). Interestingly, the specific discharge energy gradually increased to 3.6 Wh kg in 500 GCD cycles for the CFeCu system compared to 3.29 Wh kg for the CFe system in 150 cycles. In addition to energy storage, 10.75 % Cu was also extracted from the mineral, which is an important feature of the CFeCu system as it would allow Cu extraction and recovery through hydrometallurgical methods.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS₂ in a Fixed Bed Flow Cell

Deen

Asselin

2018

ChemSusChem

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“…Since Fe ion absorption is very small in spectroscopy, a colored complex is made of it that has a significant absorption in the UV-visible range compared to Fe ion and has high sensitivity in measuring iron ions. 29 Fig . 6 shows the UV-visible spectrum of 10 ml of the 0.001 molar Fe (III)-TPTZ, exposed to 0.01 g of (a) PAni, (b) PPy and (c) Poly(Ani-co-Py) for 30 min.…”

Section: Ferric Ion Reductionmentioning

confidence: 99%

Iron(III) reduction as a measure of “antioxidant power” using homo and copolymer of pyrrole and aniline electrosynthesized

Hajiabdolah¹,

Parsa²,

Anaraki‐Ardakani³

et al. 2020

Rev.Roum.Chim.

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Ferric Reducing Antioxidant Power (FRAP) assay is a measure of assessment of the total antioxidant power of compounds. In this study, the ability of homo and copolymer of Aniline (Ani) and Pyrrole (Py) to act as an antioxidant on ferric ion reduction is investigated. The oxidative homo and copolymerization on composite 2B pencil graphite were accomplished in citric acid medium containing calcium chloride (CaCl 2) as the supporting electrolyte by cyclic voltammetry method. The morphology and structural analysis of homo and copolymer was confirmed by SEM and FTIR. The FTIR and UV-visible spectra indicated that the increase of aniline monomer in the copolymer chain enhances the ferric ion reduction ability. The electrochemical impedance spectroscopy (EIS) is used for further investigation. It was revealed that the increase of aniline ring in polymeric chain decreased the charge transfer resistance (Rct) and thus increases the reduction effect and improved the free radical scavenging activity of copolymers.

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“…The most often used lixiviants are acidic chloride media, acidic sulfate media and basic ammonia solutions, together with various oxidizing agents. [3][4][5][6][7] The most often used oxidizing agents are oxygen, ferric sulfate, ferric chloride or cupric chloride. [8][9][10][11][12][13] Various other oxidizing agents were investigated as well, such as hydrogen peroxide, ammonium persulfate, hypochlorite and ozone.…”

Section: Introductionmentioning

confidence: 99%

Solvometallurgical process for extraction of copper from chalcopyrite and other sulfidic ore minerals

Monnens

et al. 2020

Green Chem.

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Extraction of copper from sufidic ores, either by pyrometallurgy or hydrometallurgy, has various limitations. In this study, a solvometallurgical process for the extraction of copper from sulfidic ore minerals (chalcopyrite, bornite, chalcocite and digenite) was developed by using an organic lixiviant (FeCl 3 as oxidizing agent and ethylene glycol (EG) as organic solvent). All the studied copper sulfide minerals could be leached efficiently with a FeCl 3 -EG solution. Other lixiviant systems, namely CuCl 2 -EG, FeCl 3 -ethanol and FeCl 3 -propylene glycol could also extract copper, but they did not perform as well as the FeCl 3 -EG solutions. The mechanistic study of chalcopyrite leaching in FeCl 3 -EG solutions confirmed that the leaching products of chalcopyrite were FeCl 2 , CuCl and solid elemental sulfur, where the Fe(II) and Cu(I) were quantified by UV-Vis absorption spectroscopy and solid sulfur was identified by powder XRD. A kinetic study showed that the leaching process was a surface chemical controlled process and the apparent activation energy was calculated to be 60.1 kJ mol −1 . Subsequently, electrodeposition of copper from the pregnant leachate was investigated, and SEM-EDX analysis showed that uniform cubic crystalline deposits of pure copper were produced. Meanwhile, the Fe(III) was regenerated by oxidizing Fe(II) at the anode, with a Morgane membrane in between two electrode compartments to prevent the transfer of Fe(III) to the cathode. Finally, a closed-loop solvometallurgical process was designed with three operational steps: leaching, electrodeposition and removal of Fe(II). The regeneration of the FeCl 3 -EG solution and the use of EG contribute to the sustainability and the greenness of the process.

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Kinetics of Ferric Ion Reduction on Chalcopyrite and its Influence on Leaching up to 150 °C

Cited by 31 publications

References 73 publications

A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS₂ in a Fixed Bed Flow Cell

A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS₂ in a Fixed Bed Flow Cell

Iron(III) reduction as a measure of “antioxidant power” using homo and copolymer of pyrrole and aniline electrosynthesized

Solvometallurgical process for extraction of copper from chalcopyrite and other sulfidic ore minerals

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Kinetics of Ferric Ion Reduction on Chalcopyrite and its Influence on Leaching up to 150 °C

Cited by 31 publications

References 73 publications

A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS2 in a Fixed Bed Flow Cell

A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS2 in a Fixed Bed Flow Cell

Iron(III) reduction as a measure of “antioxidant power” using homo and copolymer of pyrrole and aniline electrosynthesized

Solvometallurgical process for extraction of copper from chalcopyrite and other sulfidic ore minerals

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Product

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A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS₂ in a Fixed Bed Flow Cell

A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS₂ in a Fixed Bed Flow Cell