Use of mesophilic and thermophilic bacteria for the improvement of copper extraction from a low-grade ore

Darezereshki,; Schaffie,; Lotfalian,; Seiedbaghery,; Ranjbar,

doi:10.1007/s12613-201-0413-6

Cited by 2 publications

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“…Chemical leaching is expensive and cause environmental pollution. Therefore, biological leaching (bioleaching) is gained huge interest as an alternative method against chemical method [4,5]. Bioleaching principle is the metal extraction using pure or consortium of sulphur oxidizing and/or iron-oxidizing microbes [6,7].…”

Section: Introductionmentioning

confidence: 99%

Bioleaching of Arsenic from Realgar Using Leptosprillum ferriphilum: Effect of Ferrous Iron and Kinetics Aspects

2020

IJETER

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The eco-friendly technique of metal leaching, called, bioleaching is gaining huge interest in bio-hydrometallurgical process. This method is a promising technology for extraction of several valuable metals. In this investigation, biological extraction of arsenic (As) from realgar was focused. The bacteria, Leptospirillum ferriphilum was used as microbial agent. The shaker flask experiments were done at 180 rpm, with 0.3% (w/v) pulp density. The temperature and initial pH were maintained at 313 K and 1.5, respectively. The concentration of Fe(II) was varied from 1−12 g/L. The influence of Fe(II) bioleaching of arsenic was studied. The experiment results explicated that arsenic bioleaching were greatly affected by Fe(II) concentration used in the media. After 30 days, it was observed that 75.42% of arsenic was extracted at maximum when using 6 g/L of Fe(II). Kinetics on the bioleaching data were observed to be the maximum rate constant value (1.4643 d 1 ) was attained while using the optimum concentration of Fe(II). Shrinking core model (SCM) was used to identify the rate-limiting step. From the study, it was observed that the bioleaching rate of arsenic was controlled by diffusion through ash layer.

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Section: Introductionmentioning

confidence: 99%

Bioleaching of Arsenic from Realgar Using Leptosprillum ferriphilum: Effect of Ferrous Iron and Kinetics Aspects

2020

IJETER

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Effect of Particle Size on the Column Bioleaching of Tibet Yulong Copper Ore

Li¹,

Wang²,

Zhang³

et al. 2015

AMR

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This study aimed to investigate the effect of ore particle size on the bioleaching of Yulong copper ore in the bench-scale columns using the mixed culture of moderately thermophilic microorganisms. Bioleaching experiments were carried out on particle sizes of 5-10, 10-15 and 15-25mm in the same kind of column reactors. In the control test of acid leaching, the column reactor was charged with the middle particle size (10-15mm). The results indicated that copper extraction in the column reactor with particle size of 5-10 mm was highest among the three particle sizes. After 110-days leaching, 89% of copper was leached at 5-10 mm particle size while 57% was extracted at 15-25 mm particle size and 80% at 10-15 mm. Under the same particle size (10-15 mm), copper recovery in the column reactor with inoculation of microorganisms was 25% higher in comparison to the control test of acid leaching, while sulfuric acid consumption was 33% less than that.

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Use of mesophilic and thermophilic bacteria for the improvement of copper extraction from a low-grade ore

Cited by 2 publications

References 0 publications

Bioleaching of Arsenic from Realgar Using Leptosprillum ferriphilum: Effect of Ferrous Iron and Kinetics Aspects

Bioleaching of Arsenic from Realgar Using Leptosprillum ferriphilum: Effect of Ferrous Iron and Kinetics Aspects

Effect of Particle Size on the Column Bioleaching of Tibet Yulong Copper Ore

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