Copper and iron dissolution of Zijinshan low-grade copper sulfide ores was investigated in ore-packed columns. At 60 °C and pH 1.0, 37.1 g Fe(III) L−1 permitted effective copper dissolution and inhibited the activity of iron-oxidizing microorganisms. At 30 °C, microorganisms stimulated Fe(II) and pyrite oxidation, resulting in 85 and 54% of copper and pyrite extraction yields, respectively. Bacteria belonging to the genera Acidithiobacillus and Leptospirillumwere dominant as observed by real-time PCR assay. Aeration and inoculation of columnswere not necessary. Solutions had a higher pH of 1.7 in the columns operated without recirculation. Under these conditions, copper extraction was not affected and Fe(III) precipitated as jarosite, indicating a novel method for iron control in Zijinshan copper mine.

Column leaching of low-grade sulfide ore from Zijinshan copper mine / Zou, Gang; Papirio, Stefano; Lai, Xiaokang; Wu, Zengling; Zou, Laichang; Puhakka, Jaakko A.; Ruan, Renman. - In: INTERNATIONAL JOURNAL OF MINERAL PROCESSING. - ISSN 0301-7516. - 139:(2015), pp. 11-16. [10.1016/j.minpro.2015.04.005]

Column leaching of low-grade sulfide ore from Zijinshan copper mine

PAPIRIO, Stefano;
2015

Abstract

Copper and iron dissolution of Zijinshan low-grade copper sulfide ores was investigated in ore-packed columns. At 60 °C and pH 1.0, 37.1 g Fe(III) L−1 permitted effective copper dissolution and inhibited the activity of iron-oxidizing microorganisms. At 30 °C, microorganisms stimulated Fe(II) and pyrite oxidation, resulting in 85 and 54% of copper and pyrite extraction yields, respectively. Bacteria belonging to the genera Acidithiobacillus and Leptospirillumwere dominant as observed by real-time PCR assay. Aeration and inoculation of columnswere not necessary. Solutions had a higher pH of 1.7 in the columns operated without recirculation. Under these conditions, copper extraction was not affected and Fe(III) precipitated as jarosite, indicating a novel method for iron control in Zijinshan copper mine.
2015
Column leaching of low-grade sulfide ore from Zijinshan copper mine / Zou, Gang; Papirio, Stefano; Lai, Xiaokang; Wu, Zengling; Zou, Laichang; Puhakka, Jaakko A.; Ruan, Renman. - In: INTERNATIONAL JOURNAL OF MINERAL PROCESSING. - ISSN 0301-7516. - 139:(2015), pp. 11-16. [10.1016/j.minpro.2015.04.005]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/662197
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