Acidophilic bioleaching: A Review on the Process and Effect of Organic–inorganic Reagents and Materials on its Efficiency

Jafari, M; Abdollahi, Hadi; Shafaei, Sied Ziaedin; Gharabaghi, Mahdi; Jafari, Hossein; Akçıl, Ata; Panda, Sandeep

doi:10.1080/08827508.2018.1481063

Cited by 65 publications

(24 citation statements)

References 171 publications

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“…The microorganisms functions in a cooperative manner, the enhanced copper recovery have been widely reported in several studies using the mixed culture of iron and sulfur-oxidizing microbes [10, 11, 12]. Several bench-scale bioleaching studies have been carried out to determine the effects of process parameters such as the effect of pH, Fe 2+ /Fe 3+ concentration, size fraction and pulp density on metal recovery from primary sulfide/oxide minerals as well as the secondary waste [13, 14, 15, 16]. The studies on bioleaching of the PCB are still on a laboratory scale [17, 18] and did not implement at an industrial level due to its low efficiency at higher feed concentrations such as toxic effects [19].…”

Section: Introductionmentioning

confidence: 99%

Bench scale microbial catalysed leaching of mobile phone PCBs with an increasing pulp density

Garg

Nagar

Ellamparuthy

et al. 2019

Heliyon

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The study reports the effect of increasing pulp density on the bio-catalyzed leaching of metals from waste mobile phone printed circuit boards. Mixed microbial consortia of iron and sulfur-oxidizing microorganisms were used for batch bioleaching at varying pulp density of 7%, 10% and 15% (w/v). The copper content in the feed material was 26.3% (w/w) and the prime focus was to recover maximum copper along with other minor metals, such as zinc, aluminum, and nickel. All the bioleaching experiments resulted with 98–99% of copper recovery together with reasonable extraction Zn, Al, and Ni. The optimum copper recovery from bioleaching experiments demonstrates the possibility of scaling up with high pulp density, which could be economical as well as eco-friendly.

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Section: Introductionmentioning

confidence: 99%

Bench scale microbial catalysed leaching of mobile phone PCBs with an increasing pulp density

Garg

Nagar

Ellamparuthy

et al. 2019

Heliyon

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“…Thus, frothers can change the surface properties of energy resources in the culture, limit the surface tension of the media, and inhibit microorganism activities [74,75]. The toxicity of flotation reagents depends on their chemical composition, and their dosages [25][26][27]32,76]. When flotation concentrate of sulfides is subjected for metal extraction via bioleaching, presence of frothers in the solution can increase the pH at the initial stage of the process [28,29,43,77].…”

Section: Discussionmentioning

confidence: 99%

“…However, on one hand, few investigations studied the effects of flotation reagents on the bioleaching of sulfide flotation concentrates [25][26][27][28][29][30][31][32]. On the other hand, those studies (Table 1) are mainly focused on the cultures consisted one specific microorganism while in the industry, mixed microorganisms are mostly used for the bioleaching process [33].…”

Section: Introductionmentioning

confidence: 99%

Effects of Conventional Flotation Frothers on the Population of Mesophilic Microorganisms in Different Cultures

et al. 2019

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Bioleaching is an environment-friendly and low-investment process for the extraction of metals from flotation concentrate. Surfactants such as collectors and frothers are widely used in the flotation process. These chemical reagents may have inhibitory effects on the activity of microorganisms through a bioleaching process; however, there is no report indicating influences of reagents on the activity of microorganisms in the mixed culture which is mostly used in the industry. In this investigation, influences of typical flotation frothers (methyl isobutyl carbinol and pine oil) in different concentrations (0.01, 0.10, and 1.00 g/L) were examined on activates of bacteria in the mesophilic mixed culture (Acidithiobacillus ferrooxidans, Leptospirillum ferrooxidans, and Acidithiobacillus thiooxidans). For comparison purposes, experiments were repeated by pure cultures of Acidithiobacillus ferrooxidans and Leptospirillum ferrooxidans in the same conditions. Results indicated that increasing the dosage of frothers has a negative correlation with bacteria activities while the mixed culture showed a lower sensitivity to the toxicity of these frothers in comparison with examined pure cultures. Outcomes showed the toxicity of Pine oil is lower than methyl isobutyl carbinol (MIBC). These results can be used for designing flotation separation procedures and to produce cleaner products for bio extraction of metals.

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“…Regarding pH conditions, acidophiles grow optimally at pH values of 3.0 or below (Johnson and Schippers 2017). They are used in bioleaching, a process employing microorganisms such as bacteria or archaea for the extraction of valuable metals from low-grade ore, has long depended on mesophilic acidophiles such as Acidithiobacillus, Ferroplasma, Leptospirillum (Bosecker 1987;Jafari et al 2019). Similarly, thermoacidophiles ( growing at pH values around zero, and temperatures up to 65ºC) and thermoalkaliphiles (pH 6.0 -10.0) exhibit clear applicability for industrial purposes, particularly hydrolases for the degradation of biomass for biofuel production (Sharma, Kawarabayasi, and Satyanarayana 2012;Zhao et al 2018;Maruthamuthu and Van Elsas 2017;Zaparty and Siebers 2011).…”

Section: Extremozymesmentioning

confidence: 99%

Thermophilic Enzymes

Viegas

Ramos

Fernandes

2021

UPjeng

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Substantial improvements in the industrial production of goods led to a widespread feeling of unlimited access to food, commodities, and energy. As greener alternatives for industrial processes are in demand, scientists have turned to enzymes, looking for apt biocatalysts. Focusing on extremophiles, this mini review draws a comparison between thermophiles and their mesophilic counterparts, exploring what features are instrumental to their thermostability. A higher number of ion-pairs, hydrophobicity of buried side chains, compact tertiary structure cores, and a complex network of hydrogen bonds are the four main characteristics responsible for the robustness of thermophilic enzymes.

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Acidophilic bioleaching: A Review on the Process and Effect of Organic–inorganic Reagents and Materials on its Efficiency

Cited by 65 publications

References 171 publications

Bench scale microbial catalysed leaching of mobile phone PCBs with an increasing pulp density

Bench scale microbial catalysed leaching of mobile phone PCBs with an increasing pulp density

Effects of Conventional Flotation Frothers on the Population of Mesophilic Microorganisms in Different Cultures

Thermophilic Enzymes

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