A Comparative Kinetic Study of Chalcopyrite Leaching Using Alternative Oxidants in Methanesulfonic Acid System

Junmo Ahn; Jiajia Wu; Jaeheon Lee

doi:10.1080/08827508.2021.1893719

A Comparative Kinetic Study of Chalcopyrite Leaching Using Alternative Oxidants in Methanesulfonic Acid System

Junmo Ahn, Jiajia Wu, Jaeheon Lee

Mining and Geological Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Methanesulfonic acid was proven to be an alternative lixiviant for copper leaching from chalcopyrite with hydrogen peroxide as an oxidant. Two alternative oxidants, dichromate and nitrate, were studied for the copper dissolution from chalcopyrite, a refractory copper sulfide mineral. During chalcopyrite leaching tests, both oxidants achieved the copper extraction above 90% in 30 g/L methanesulfonic acid at 75^oC. The activation energies in dichromate and nitrate leaching systems were 23 and 43 kJ/mol, classified as mass transfer and chemical reaction-controlled mechanism, respectively. The XRD analysis of a leached residue showed a formation of K-Cr-jarosite from methanesulfonic acid-dichromate system. Methanesulfonic acid with nitrate leaching system could be the most effective and sustainable for chalcopyrite leaching based on the comparative investigation.

Original language	English (US)
Pages (from-to)	390-401
Number of pages	12
Journal	Mineral Processing and Extractive Metallurgy Review
Volume	43
Issue number	3
DOIs	https://doi.org/10.1080/08827508.2021.1893719
State	Published - 2022

Keywords

Chalcopyrite
alternative oxidants
dichromate
methanesulfonic acid
nitrate

ASJC Scopus subject areas

Chemistry(all)
Geotechnical Engineering and Engineering Geology
Mechanical Engineering
Economic Geology

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10.1080/08827508.2021.1893719

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title = "A Comparative Kinetic Study of Chalcopyrite Leaching Using Alternative Oxidants in Methanesulfonic Acid System",

abstract = "Methanesulfonic acid was proven to be an alternative lixiviant for copper leaching from chalcopyrite with hydrogen peroxide as an oxidant. Two alternative oxidants, dichromate and nitrate, were studied for the copper dissolution from chalcopyrite, a refractory copper sulfide mineral. During chalcopyrite leaching tests, both oxidants achieved the copper extraction above 90% in 30 g/L methanesulfonic acid at 75oC. The activation energies in dichromate and nitrate leaching systems were 23 and 43 kJ/mol, classified as mass transfer and chemical reaction-controlled mechanism, respectively. The XRD analysis of a leached residue showed a formation of K-Cr-jarosite from methanesulfonic acid-dichromate system. Methanesulfonic acid with nitrate leaching system could be the most effective and sustainable for chalcopyrite leaching based on the comparative investigation.",

keywords = "Chalcopyrite, alternative oxidants, dichromate, methanesulfonic acid, nitrate",

author = "Junmo Ahn and Jiajia Wu and Jaeheon Lee",

note = "Funding Information: Freeport Foundation{\textquoteright}s support to the Department of Mining and Geological Engineering at the University of Arizona is greatly appreciated. A part of Junmo Ahn and Jiajia Wu{\textquoteright}s graduate assistantship was provided by Freeport-McMoRan Foundation through the Sustaining 21st Century Mining Education in Arizona program. The corresponding author, Jaeheon Lee, also would like to express his appreciation to Freeport-McMoRan and SME foundation for their support of SME Career Development Grant as a recipient of the program. This publication is a portion of Junmo Ahn{\textquoteright}s dissertation “Investigation of Chalcopyrite Leaching Kinetics by Alternative Leaching Chemicals” which was submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the University of Arizona. Publisher Copyright: {\textcopyright} 2021 Taylor & Francis Group, LLC.",

year = "2022",

doi = "10.1080/08827508.2021.1893719",

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pages = "390--401",

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AU - Ahn, Junmo

AU - Wu, Jiajia

AU - Lee, Jaeheon

N1 - Funding Information: Freeport Foundation’s support to the Department of Mining and Geological Engineering at the University of Arizona is greatly appreciated. A part of Junmo Ahn and Jiajia Wu’s graduate assistantship was provided by Freeport-McMoRan Foundation through the Sustaining 21st Century Mining Education in Arizona program. The corresponding author, Jaeheon Lee, also would like to express his appreciation to Freeport-McMoRan and SME foundation for their support of SME Career Development Grant as a recipient of the program. This publication is a portion of Junmo Ahn’s dissertation “Investigation of Chalcopyrite Leaching Kinetics by Alternative Leaching Chemicals” which was submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the University of Arizona. Publisher Copyright: © 2021 Taylor & Francis Group, LLC.

PY - 2022

Y1 - 2022

N2 - Methanesulfonic acid was proven to be an alternative lixiviant for copper leaching from chalcopyrite with hydrogen peroxide as an oxidant. Two alternative oxidants, dichromate and nitrate, were studied for the copper dissolution from chalcopyrite, a refractory copper sulfide mineral. During chalcopyrite leaching tests, both oxidants achieved the copper extraction above 90% in 30 g/L methanesulfonic acid at 75oC. The activation energies in dichromate and nitrate leaching systems were 23 and 43 kJ/mol, classified as mass transfer and chemical reaction-controlled mechanism, respectively. The XRD analysis of a leached residue showed a formation of K-Cr-jarosite from methanesulfonic acid-dichromate system. Methanesulfonic acid with nitrate leaching system could be the most effective and sustainable for chalcopyrite leaching based on the comparative investigation.

AB - Methanesulfonic acid was proven to be an alternative lixiviant for copper leaching from chalcopyrite with hydrogen peroxide as an oxidant. Two alternative oxidants, dichromate and nitrate, were studied for the copper dissolution from chalcopyrite, a refractory copper sulfide mineral. During chalcopyrite leaching tests, both oxidants achieved the copper extraction above 90% in 30 g/L methanesulfonic acid at 75oC. The activation energies in dichromate and nitrate leaching systems were 23 and 43 kJ/mol, classified as mass transfer and chemical reaction-controlled mechanism, respectively. The XRD analysis of a leached residue showed a formation of K-Cr-jarosite from methanesulfonic acid-dichromate system. Methanesulfonic acid with nitrate leaching system could be the most effective and sustainable for chalcopyrite leaching based on the comparative investigation.

KW - Chalcopyrite

KW - alternative oxidants

KW - dichromate

KW - methanesulfonic acid

KW - nitrate

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A Comparative Kinetic Study of Chalcopyrite Leaching Using Alternative Oxidants in Methanesulfonic Acid System

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