Iodine-assisted chalcopyrite leaching in ferric sulfate media: Kinetic study under fully controlled redox potential and pH

Winarko, Ronny; Dreisinger, David; Miura, Akira; Fukano, Yuken; Liu, Wenying

doi:10.1016/j.hydromet.2021.105797

Cited by 10 publications

(2 citation statements)

References 34 publications

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“…While electrocatalysis can be carried out in a variety of media, non-aqueous eutectic mixtures can decrease passivation of some metals, while careful selection of the redox catalyst can enable selective solubilisation of metals from complex mixtures 37 , 61 . For instance, iodine has been reported as a strong oxidising agent for metal and mineral digestion, particularly for solubilising gold in a wide variety of solvents, both aqueous and non-aqueous systems 58 , 59 , 61 – 68 . Iron(III) chloride (FeCl 3 ) and copper(II) chloride (CuCl 2 ) have also been reported as redox catalysts in different ionic fluids and brines, for the dissolution of metals from solar photovoltaic cells and printed circuit boards.…”

Section: Resultsmentioning

confidence: 99%

A novel method for extracting metals from asteroids using non-aqueous deep eutectic solvents

Rivera,

Bird,

Jenkin

et al. 2023

Sci Rep

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Extra-terrestrial mining and metal processing are vital for access to strategic metals for space exploration. This study demonstrates for the first time the catalytic dissolution of metals from meteorite proxies of metal-rich asteroids using a deep eutectic solvent (DES). DESs are of particular interest for extra-terrestrial mining as they can be designed to have relatively low vapour pressures and could potentially be made from organic waste products created in extra-terrestrial settlements. Three types of meteorites were investigated: two chondrites (H3, H5) and one iron (IAB-MG) meteorite. Chondrite samples were composed of silicates (olivine, pyroxene) with metal-rich phases occurring as native metal alloys, sulphides and oxides. Metallic Fe–Ni and troilite (FeS) are the most abundant metal-bearing phases in all three samples, particularly in the iron-rich meteorite. The samples were subjected to chemical micro-etching experiments with iodine and iron(III) chloride as oxidising agents in a DES formed from the mixture of choline chloride and ethylene glycol. Micro-etching experiments demonstrated that Fe–Ni rich phases are effectively leached out in this system, while other mineral phases remain unreactive.

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Section: Resultsmentioning

confidence: 99%

A novel method for extracting metals from asteroids using non-aqueous deep eutectic solvents

Rivera,

Bird,

Jenkin

et al. 2023

Sci Rep

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“…The use of iodide ions (I − ) can be particularly attractive because they improve the recovery of copper ores [ 50 ] and offer an alternative to the ferric ion leaching process [ 51 ]. Even a mixture of these two lixiviants results in higher dissolution created by the duplex (Fe 3+ /I − ) [ 35 , 50 , 52 , 53 , 54 ]. Konyratbekova, Baikonurova [ 49 ] indicates that the use of leaching agents such as Cl 2 , Br 2 , and I 2 salts, together with iodide ions from the KI salt, significantly increases the probability of dissolution of metal sulfides, in particular iron sulfides such as pyrite (FeS 2 ).…”

Section: Introductionmentioning

confidence: 99%

Leaching of Copper Concentrate with Iodized Salts in a Saline Acid Medium: Part 1—Effect of Concentrations

Castellón

Taboada

2023

Materials

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One of the main problems in processing chalcopyrite ore with hydrometallurgical methods is its refractoriness, which is due to the formation of a layer that inhibits the contact of the ore with the leaching solution, thus reducing the dissolution rate. The main objective of this paper is to evaluate the leaching potential of iodide ions in copper extraction from chalcopyrite concentrate in an acidic seawater medium. Leaching tests were carried out in glass reactors stirred at 45 °C. Parameters such as iodide salt concentration and acidity were evaluated in ranges of 0–5000 ppm and 0–1.0 M, respectively. According to the results obtained, adding iodide ions to a medium acid enhances the leaching kinetics in the chalcopyrite concentrate, observing that it improves copper extraction at low concentrations of 100 ppm KI compared to high concentrations of 5000 ppm KI. As a result, part of the iodide required to oxidize copper tends to sublimate or is associated with other ions producing iodinated compounds such as CuI. Copper extraction reached 45% within the first 96 h, while at 216 h, it reached an extraction of close to 70% copper. The recovery rate improves at potentials between 600 and 650 mV, while at lower potentials, the copper extraction decreases. The mineral surface was analyzed using SEM/EDS and XRD analyses for the identification of precipitates on the surface, finding porous elemental sulfur and precipitated jarosite. An increase in iodide ions improves the leaching kinetics in the chalcopyrite concentrate, observing that it improves copper extraction at low concentrations of 100 ppm KI compared to high concentrations of 5000 ppm KI. As a result, part of the iodide required to oxidize copper tends to sublimate or is associated with other ions producing iodinated compounds such as CuI. Copper extraction reached 45% within the first 96 h, while at 216 h, it reached an extraction of close to 70% copper. The recovery rate improves at potentials between 600 and 650 mV, while at lower potentials, the copper extraction decreases. The mineral surface was analyzed using SEM/EDS and XRD analyses for the identification of precipitates on the surface, finding porous elemental sulfur and precipitated jarosite.

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Hydrometallurgical processing of chalcopyrite: A review of leaching techniques

Cheje Machaca,

Botelho,

de Carvalho

et al. 2024

Int J Miner Metall Mater

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Iodine-assisted chalcopyrite leaching in ferric sulfate media: Kinetic study under fully controlled redox potential and pH

Cited by 10 publications

References 34 publications

A novel method for extracting metals from asteroids using non-aqueous deep eutectic solvents

A novel method for extracting metals from asteroids using non-aqueous deep eutectic solvents

Leaching of Copper Concentrate with Iodized Salts in a Saline Acid Medium: Part 1—Effect of Concentrations

Hydrometallurgical processing of chalcopyrite: A review of leaching techniques

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