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

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Details

Original languageEnglish
Article number2730
Pages (from-to)11-16
Number of pages6
JournalInternational Journal of Mineral Processing
Volume139
DOIs
Publication statusPublished - 15 Jul 2015
Publication typeA1 Journal article-refereed

Abstract

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<sup>- 1</sup> 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 Leptospirillum were dominant as observed by real-time PCR assay. Aeration and inoculation of columns were 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.

Keywords

  • Chalcocite, Column bioleaching, Ferric leaching, Jarosite, Temperature

Publication forum classification

Field of science, Statistics Finland