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Kinetic Investigation on Leaching of Copper from a Low-Grade Copper Oxide Deposit in Sulfuric Acid Solution: A Case Study of the Crushing Circuit Reject of a Copper Heap Leaching Plant.

Hosseinzadeh, Mostafa, Entezari Zarandi, Ali, Pasquier, Louis-César ORCID: https://orcid.org/0000-0002-7155-3257 et Azizi, Asghar (2021). Kinetic Investigation on Leaching of Copper from a Low-Grade Copper Oxide Deposit in Sulfuric Acid Solution: A Case Study of the Crushing Circuit Reject of a Copper Heap Leaching Plant. Journal of Sustainable Metallurgy , vol. 7 , nº 3. p. 1154-1168. DOI: 10.1007/s40831-021-00408-5.

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Résumé

In this study, the reject fraction of the jaw crusher, located in the frst part of the crushing circuit, is used as a consider able stock in copper tank-leaching plant. High market value of copper and ease of practice were the motivating forces on studying the leaching kinetics under controlled conditions. In this regard, frst, the infuencing parameters such as the acid concentration, solid-to-liquid ratio, agitation speed, particle size, and temperature were assessed on the leaching fraction of copper. The fndings showed that the leaching rate is nearly independent of the agitation rate at the high values of 300 rpm. The recovery of copper strongly promoted from 2 to 90% by increasing sulfuric acid concentration from 0.3 to 1.8 M. The increase in the solid-to-liquid ratio and temperature were found to be benefcial as well. Additionally, it was found that above 71% copper could be leached from the reject samples in the size range of 0–2 mm by 0.9 M sulfuric acid after 30 min contact time at 25 °C temperature. In the second stage, the leaching kinetics was studied by shrinking core models to gain a better description of the dissolution process of copper from crushing circuit reject. The results indicated that the dissolution rate could be controlled by both chemical reaction and difusion process. However, difusion process was the dominant mecha nism in the system investigated. Ultimately, a mixed kinetic model with an activation energy of 11.72 kJ/mol was proposed as the leaching rate-controlling step.

Type de document: Article
Mots-clés libres: crushing circuit reject; copper; leaching; kinetics; shrinking core model; activation energy
Centre: Centre Eau Terre Environnement
Date de dépôt: 15 oct. 2021 17:40
Dernière modification: 15 févr. 2022 21:02
URI: https://espace.inrs.ca/id/eprint/12020

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