Tank bioleaching of copper from combined flotation concentrate and smelter dust

Vakylabad, Ali Behrad; Ranjbar, Mohammad; Manafi, Zahra; Bakhtiari, Fereshteh

doi:10.1016/j.ibiod.2011.09.006

Cited by 18 publications

(13 citation statements)

References 15 publications

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“…The bioleaching tests were conducted by using the fractional method [5]. In the bioleaching reactors, the tests were started in batch mode by introducing 5% concentrate and inoculating with 10% v/v of a mixed mesophilic and mixed moderately thermophilic microbial consortium, and temperatures were controlled at 35 • C or 50 • C. Initial test work performed on the concentrate (results not shown) indicated that the highest bacterial population occurred on day 7.…”

Section: Bioleaching Experimentsmentioning

confidence: 99%

“…In spite of the reports in this regard [4,5], two questions are central to the debate here: firstly, which is the best option for the bioleaching operation, stirred tank or airlift reactors?…”

Section: Introductionmentioning

confidence: 99%

“…Copper extraction from combined flotation concentrate and smelter dust has been studied [5]. The results of the study revealed that it is possible to efficiently extract copper from the combined using STRs at 50 • C inoculated by moderately thermophilic bacteria [5].…”

Section: Introductionmentioning

confidence: 99%

“…However, the bioleaching of chalcopyrite is still a major challenge due to relatively slow kinetics and poor extractions [4,5,12], which have mainly been attributed to passivity [18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bio-processing of copper from combined smelter dust and flotation concentrate: A comparative study on the stirred tank and airlift reactors

Vakylabad

Schaffie

Ranjbar

et al. 2012

Journal of Hazardous Materials

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Section: Bioleaching Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Bio-processing of copper from combined smelter dust and flotation concentrate: A comparative study on the stirred tank and airlift reactors

Vakylabad

Schaffie

Ranjbar

et al. 2012

Journal of Hazardous Materials

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“…Temperature, pH, physiologies of individual species, and other factors, such as metals and toxic ions, are determinative factors for the "logically designed" consortium. Previous reports indicated that cultures prepared on the basis of the bottom-up approach were more efficient in accelerating mineral oxidation (2,7,(24)(25)(26)(27)(28)(29). A previous study by us had demonstrated that a culture containing autotrophs and mixotrophs was far more effective in promoting chalcopyrite leaching than a mixed culture containing any combination of two or three of the four species (Acidithiobacillus caldus, Leptospirillum ferriphilum, Sulfobacillus sp., and Ferroplasma thermophilum) (30).…”

mentioning

confidence: 99%

A Moderately Thermophilic Mixed Microbial Culture for Bioleaching of Chalcopyrite Concentrate at High Pulp Density

Wang

Zeng

Qiu

et al. 2014

Appl Environ Microbiol

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Three kinds of samples (acid mine drainage, coal mine wastewater, and thermal spring) derived from different sites were collected in China. Thereafter, these samples were combined and then inoculated into a basal salts solution in which different substrates (ferrous sulfate, elemental sulfur, and chalcopyrite) served as energy sources. After that, the mixed cultures growing on different substrates were pooled equally, resulting in a final mixed culture. After being adapted to gradually increasing pulp densities of chalcopyrite concentrate by serial subculturing for more than 2 years, the final culture was able to efficiently leach the chalcopyrite at a pulp density of 20% (wt/vol). At that pulp density, the culture extracted 60.4% of copper from the chalcopyrite in 25 days. The bacterial and archaeal diversities during adaptation were analyzed by denaturing gradient gel electrophoresis and constructing clone libraries of the 16S rRNA gene. The results show that the culture consisted mainly of four species, including Leptospirillum ferriphilum, Acidithiobacillus caldus, Sulfobacillus acidophilus, and Ferroplasma thermophilum, before adapting to a pulp density of 4%. However, L. ferriphilum could not be detected when the pulp density was greater than 4%. Real-time quantitative PCR was employed to monitor the microbial dynamics during bioleaching at a pulp density of 20%. The results show that A. caldus was the predominant species in the initial stage, while S. acidophilus rather than A. caldus became the predominant species in the middle stage. F. thermophilum accounted for the greatest proportion in the final stage.

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Optimization of staged bioleaching of low-grade chalcopyrite ore in the presence and absence of chloride in the irrigating lixiviant: ANFIS simulation

Vakylabad

Schaffie

Naseri

et al. 2016

Bioprocess Biosyst Eng

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In this investigation, copper was bioleached from a low-grade chalcopyrite ore using a chloride-containing lixiviant. In this regard, firstly, the composition of the bacterial culture media was designed to control the cost in commercial application. The bacterial culture used in this process was acclimated to the presence of chloride in the lixiviant. Practically speaking, the modified culture helped the bio-heap-leaching system operate in the chloridic media. Compared to the copper recovery from the low-grade chalcopyrite by bioleaching in the absence of chloride, bioleaching in the presence of chloride resulted in improved copper recovery. The composition of the lixiviant used in this study was a modification with respect to the basal salts in 9 K medium to optimize the leaching process. When leaching the ore in columns, 76.81 % Cu (based on solid residues of bioleaching operation) was recovered by staged leaching with lixiviant containing 34.22 mM NaCl. The quantitative findings were supported by SEM/EDS observations, X-ray elemental mapping, and mineralogical analysis of the ore before and after leaching. Finally, Adaptive neuro-fuzzy inference system (ANFIS) was used to simulate the operational parameters affecting the bioleaching operation in chloride-sulfate system.

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Tank bioleaching of copper from combined flotation concentrate and smelter dust

Cited by 18 publications

References 15 publications

Bio-processing of copper from combined smelter dust and flotation concentrate: A comparative study on the stirred tank and airlift reactors

Bio-processing of copper from combined smelter dust and flotation concentrate: A comparative study on the stirred tank and airlift reactors

A Moderately Thermophilic Mixed Microbial Culture for Bioleaching of Chalcopyrite Concentrate at High Pulp Density

Optimization of staged bioleaching of low-grade chalcopyrite ore in the presence and absence of chloride in the irrigating lixiviant: ANFIS simulation

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