Chalcopyrite leaching with iodine (JX Iodine Process) for various ore types

Fukano, Yuken; Miura, Akira

doi:10.1016/j.hydromet.2021.105752

Cited by 7 publications

(2 citation statements)

References 5 publications

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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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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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“…Iodine is a very efficient oxidising agent which has been used for metal and mineral digestion, as it is strong enough to dissolve gold in both aqueous [20][21][22] and DES systems 19,[23][24][25][26] under mild conditions, along with other metals found in printed circuit boards 27 and minerals. [28][29][30] Phosphonium halide and trihalide ionic liquids have also been successfully used to digest metals. [31][32][33] Iodine has a high solubility in ionic media, despite normally only being soluble in non-polar solvents if a complex anion is formed with another halide species, e.g.…”

Section: Introductionmentioning

confidence: 99%