The effect of redox control on the continuous bioleaching of chalcopyrite concentrate

Lotfalian, Majid; Ranjbar, Mohammad; Fazaelipoor, Mohammad Hassan; Schaffie, Mahin; Manafi, Zahra

doi:10.1016/j.mineng.2015.07.006

Cited by 39 publications

(11 citation statements)

References 22 publications

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“…Combined with the variations of copper extraction during bioleaching, we found that the formation of element sulfur and jarosite did not inhibit the further dissolution of bornite, which was different from the conclusion of chalcopyrite bioleaching (Sandström et al, 2005;Wang et al, 2016). (Hiroyoshi et al, 2008;Lotfalian et al, 2015) pointed out that the redox potential of the leaching solution was primarily determined by the Nernst equation: Fig. 7 indicates that the addition of pyrite increased the concentration of Fe 2+ , and then Fe 2+ was oxidant to Fe 3+ with dissolved oxygen by L. ferriphilum, so the addition of pyrite obviously increased solution redox potential.…”

Section: Accepted Manuscriptmentioning

confidence: 65%

Synergetic effect of pyrite on strengthening bornite bioleaching by Leptospirillum ferriphilum

et al. 2018

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Section: Accepted Manuscriptmentioning

confidence: 65%

Synergetic effect of pyrite on strengthening bornite bioleaching by Leptospirillum ferriphilum

et al. 2018

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“…The interpretation of the data suggested that with an increase in ore pulp density, there was a decrease in Cu solubilization from copper ore. It has been reported that for gaining higher yield of copper from the ores, pulp density must be optimized [2,37].…”

Section: Effect Of Ore Pulp Density On Copper Bioleaching From Orementioning

confidence: 99%

Catalytic Efficiency of <i>Acidithiobacillus ferrooxidans</i> for Bioleaching Copper from Chalcocite Containing Sulfide Ore from Reko Diq Deposits

Furqan¹,

Farooq²,

Liaquat³

et al. 2020

Pol. J. Environ. Stud.

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Bioleaching of low-grade secondary copper sulphide ores using different microbial strains is an ecologically safe technology for the recovery of metals in the mineral and mining industry. The purpose of the present study was to analyze the mineral contents of Reko Diq deposits and to assess the dissolution of copper from sulfide ore by an indigenously isolated strain of acidophilic iron-and sulfur-oxidizing bacterium (BSTFe-2) in shake flask experiments. X-ray diffraction (XRD) analysis of the ore sample suggested that it contained 0.81% Cu on dry matter basis and contained chalcocite (Cu 2 S) and covellite (CuS) as main copper minerals. Pyrite (FeS 2 ) was also present as a sulfide mineral. The other minerals detected in the ore matrix were muscovite (a di-octahedral mica mineral), quartz, feldspar (anorthite) and calcite. Quartz (SiO 2 ) was the main silicate mineral present in the sample. Calcite (CaCO 3 ) was found as the main acid-consuming gangue mineral. We observed that about 80-90% of the total Cu content present in the ore matrix was solubilized during 30 days of the leaching process mediated by Acidithiobacillus ferrooxidans at 30ºC. Copper dissolution from ore was found to be directly related to the reaction pH (1.5-1.9). The leaching data obtained from the pulp densities (5, 10 and 20% wt/

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“…These can be mainly attributed to two factors: (i) the high lattice energy of chalcopyrite, making it difficult to decompose; and (ii) the formation of a surface passivation film during chalcopyrite bioleaching, which is made up of sulfur-containing intermediates such as elemental sulfur, jarosite, polysulphides, and metal-deficient sulphides [5,6]. To prevent such passivation, many approaches have been proposed, for example, use of thermophilic microorganisms [7], lowering pH conditions [8], controlling the redox potential [9], and the addition of catalysts like silver and activated carbon [10,11]. Although each method possesses its own advantages of high activity of bacteria, high reaction efficiency, complete dissolution, or simple technique, it should be noted that they do have specific drawbacks such as a low metal tolerance capability, high acid consumption, complicated process, or high operation cost, which limit their application in industry.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Leaching of Chalcopyrite Using Acidithiobacillus ferrooxidans under the Induction of Surfactant Triton X-100

et al. 2018

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Chalcopyrite is the richest copper sulfide mineral in the world, but it is also the most resistant to biohydrometallurgical processing. To promote the bioleaching of chalcopyrite, a nonionic surfactant, t-octyl phenoxy polyethoxy ethanol (Triton X-100), was employed in this paper. Action of Triton X-100 in chalcopyrite leaching using Acidithiobacillus ferrooxidans was explored in shake flasks. Results showed that 30 mg·L−1 of Triton X-100 increased the bioleaching yield of copper by 42.21% compared to the process without additive after 24 days. Under the stress of Triton X-100, the bioleaching efficiency of chalcopyrite slightly dropped at an early stage, but remarkably increased afterwards. XRD and XPS analysis of the leach residues demonstrated that potassium jarosite and elemental sulfur resulted in surface leaching passivation. Surfactant Triton X-100 appeared to induce the oxidation of elemental sulfur by bacteria owing to the increase in the sulfur surface hydrophobicity. These results suggest that Triton X-100 itself has no ability to leach chalcopyrite, but under its induction, the bioleaching of chalcopyrite can be enhanced due to the removal of the passivation layer.

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The effect of redox control on the continuous bioleaching of chalcopyrite concentrate

Cited by 39 publications

References 22 publications

Synergetic effect of pyrite on strengthening bornite bioleaching by Leptospirillum ferriphilum

Synergetic effect of pyrite on strengthening bornite bioleaching by Leptospirillum ferriphilum

Catalytic Efficiency of <i>Acidithiobacillus ferrooxidans</i> for Bioleaching Copper from Chalcocite Containing Sulfide Ore from Reko Diq Deposits

Enhancing the Leaching of Chalcopyrite Using Acidithiobacillus ferrooxidans under the Induction of Surfactant Triton X-100

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