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

Vakylabad, Ali Behrad; Schaffie, Mahin; Ranjbar, Mohammad; Manafi, Zahra; Darezereshki, Esmaeel

doi:10.1016/j.jhazmat.2012.09.031

Cited by 36 publications

(6 citation statements)

References 33 publications

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“…28 The increasing concentrations of the ferrous and ferric ions in the liquid microenvironment gradually initiated and enhanced the "indirect contact" mechanism. 29,30 Also, the accumulated ferric ions partly participated during the formation of jarosite, as shown in eqn (6). In the "direct contact" mechanism's sulfur metabolism (A. thiooxidans ZJJN-3/A.…”

Section: Overall Assessment Effects Of Adsorption Behavior In Bioleac...mentioning

confidence: 99%

Insights into the enhancement mechanism coupled with adapted adsorption behavior from mineralogical aspects in bioleaching of copper-bearing sulfide ore by Acidithiobacillus sp.

Feng

Yang

2015

RSC Adv.

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Section: Overall Assessment Effects Of Adsorption Behavior In Bioleac...mentioning

confidence: 99%

Insights into the enhancement mechanism coupled with adapted adsorption behavior from mineralogical aspects in bioleaching of copper-bearing sulfide ore by Acidithiobacillus sp.

Feng

Yang

2015

RSC Adv.

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“…Tank leaching is regarded as the expensive method of commercial leaching amongst other methods. It has been showing good performance for implementing bioleaching (Bosecker, 1997; Vakylabad et al., 2012). In the view of increasing the extraction rate from the ores, leaching carried out at shaker flask level in lab scale is then shifted to large bioreactor which has proper agitation facilities.…”

Section: Bioleaching Methodsmentioning

confidence: 99%

Recent bioleaching approaches employed for the extraction of metals in mining fields for the purpose of utilization and creating the sustainable future

Devi¹,

Sambasivam²

2023

Environmental Quality Mgmt

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Recovery of the resources is considered to be a significant thing in the perspective of saving the cost economically and also for sustainable future utilization efficiently. Metals are extracted by mining processes in mines located on all over the world to consummate the needs put forth by the developing society. But mining process was found to be possessing and creating negative impact on environment during the time of mining and even after closed completely. This negative impact mainly relies on the process which is employed during the extraction of metals. Chemical methods were conventionally used from then until today for the extraction purposes. But it was reported that it has been severely affecting the surroundings. So, many mining industries started to find out the way for shifting themselves towards eco‐friendly procedures. As a result, microorganisms are employed to promote the process towards non‐polluting and naturally sustainable way. This process of using microorganisms for the extraction purposes was termed as bioleaching. It is now regarded as one of the effective ways for extraction purposes, but in limited cases. So, rather than using the chemical leaching method which highly includes chemical reactions that may be toxic or non‐toxic, this bioleaching method could be followed for its cost‐effective nature. It is a more environmentally friendly method when compared with traditional methods of industrial mining. Bacterial and Fungal species were importantly used for carrying out bioleaching. This method has now become a possible thing because of biotechnological improvements and advancements. It is also worth to note here that many researches have been going on currently to study the diversity of this concept. This article mainly aims at elucidating the overall concept of bioleaching using microorganisms in the mining industry as well as its mechanisms, applications, recent advancements and its future expectations.

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“…Despite the high production levels, deep concerns arise about the significant emissions of sulfur dioxide caused by these operations. For example, the Peruvian copper smelters emit about 1.5 × 10 6 tons of SO2 (Vakylabad et al, 2012, Carn et al, 2007. In this context, extending hydrometallurgy to sulfide minerals is presented as a promising option to reduce environmental impacts; however, the perplexity lies in the low operation efficiencies of the processes, especially at the room temperature and atmospheric pressure (Toro et al, 2020;Torres et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Regardless of the process, principle concern in conjunction with its leaching is a slow and incomplete dissolution of the mineral. This is mainly because of the formation of passive layers like polysulfide, metal-deficient sulfides, iron hydroxysulfate species, and elemental sulfur (S 0 ) on its surface (Nazari, 2012;Khoshkhoo et al, 2014;Klauber 2008;Vakylabad et al, 2016;Vakylabad et al, 2012, Hassanzadeh et al, 2021. These passive layers render electron transfers from chalcopyrite to pyrite and limite galvanic reactions.…”

Section: Introductionmentioning

confidence: 99%

Effect of externally adding pyrite and electrical current on galvanic leaching of chalcopyrite concentrate

Asgari¹,

Hassanzadeh²,

Nazari³

et al. 2021

Physicochem. Probl. Miner. Process.

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Although the operating properties of Galvanox TM leaching have been widely studied in the literature, several factors concerning chalcopyrite passivation during the process remain unknown so far. The present work hence aims at investigating the significant effect of externally added pyrite features with a particular focus on its particle size (d80 of 0.52, 20, 45 and 2000 µm) through a series of experiments performed in a 2-L stirred-tank electro-reactor. To this end, the role of pyrite: chalcopyrite ratio (0.49:1, 2:1 and 4:1) and presence of electrical current were examined while the rest of the parameters kept constant (80 °C temperature, 400-500 mV (Ag/AgCl) redox potential, pulp density of 10% (w/v), and stirring rate of 1200 rpm). Plus, kinetic models of the leaching tests were studied based on the diffusion and chemical controlling concepts. It was found that the coarser the pyrite particles, the more favorable the copper extraction from the concentrate due to acceleration of reactions in the cathodic electrode and high mass transfers. However, this was in contradiction with the existing reports in the literature. Moreover, galvanic interactions became intensive in the presence of pyrite meaning extensive chalcopyrite dissolution with significantly reduced passivation. Ultimate copper extraction values of 24.17±1.25%, 55.79±0.91% and 57.26±1.59% were resulted at Py:Cp ratios of 0.49:1 (natural), 2:1 and 4:1, respectively. The results showed that maximum copper recovery of 67.32±2.34% was obtained at an optimum condition of pyrite grain size=2000 µm, Py:Cp=4:1, current application=500 mA, 8 h and 80 °C. Finally, detailed kinetic modeling indicated that the chemical control mechanism was dominant in the early reaction stages (t<3.5 h) concerning the availability of fresh surface for chemical agents; however, the second half of the process (8.0 h>t>3.5 h) was controlled by the diffusion control.

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

Cited by 36 publications

References 33 publications

Insights into the enhancement mechanism coupled with adapted adsorption behavior from mineralogical aspects in bioleaching of copper-bearing sulfide ore by Acidithiobacillus sp.

Insights into the enhancement mechanism coupled with adapted adsorption behavior from mineralogical aspects in bioleaching of copper-bearing sulfide ore by Acidithiobacillus sp.

Recent bioleaching approaches employed for the extraction of metals in mining fields for the purpose of utilization and creating the sustainable future

Effect of externally adding pyrite and electrical current on galvanic leaching of chalcopyrite concentrate

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