Bioleaching of zinc and nickel from silicates using Aspergillus niger cultures

Castro, Ieso de Miranda; Fietto, Juliana Lopes Rangel; Vieira, R.X.; Trópia, Maria José Magalhães; Campos, Lígia Maria Moreira de; Paniago, Eucler B.; Brandão, Rogélio Lopes

doi:10.1016/s0304-386x(00)00088-8

Cited by 123 publications

(49 citation statements)

References 9 publications

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“…Fungi appeared to participate in the leaching process or citric acid appeared to be used more effectively in the presence of the fungus. Similar observations were made by other researchers (Alibhai et al 1993;Kar et al 1995;Castro et al 2000;Valix et al 2001). Kar et al (1995) attributed the enhanced leaching of nickel from lateritic ore to a higher local concentration of the bioacids formed in the presence of fungus than in fungusfree spent medium.…”

Section: Resultssupporting

confidence: 79%

Bioleaching of nickel from equilibrium fluid catalytic cracking catalysts

Bayraktar

2005

World J Microbiol Biotechnol

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SummaryThis study investigates the possibility of reusing metal-contaminated equilibrium fluid catalytic cracking (FCC) catalyst after bioleaching. Leaching with Aspergillus niger culture was found to be more effective in the mobilization of nickel from the catalyst particles compared to chemical leaching with citric acid. Bioleaching achieved 32% nickel removal whereas chemical leaching achieved only 21% nickel removal from catalyst particles. The enhanced nickel removal from the catalysts in the presence of A. niger culture was attributed to the biosorption ability of the fungal mycelium and to the higher local concentration of citric acid on the catalyst surface. It was found that 9% of solubilized nickel in the liquid medium was biosorbed to fungal biomass. After nickel leaching with A. niger culture, the hydrogen-to-methane molar ratio and coke yield, which are the measures of dehydrogenation reactions catalysed by nickel during cracking reactions, decreased significantly.

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Section: Resultssupporting

confidence: 79%

Bioleaching of nickel from equilibrium fluid catalytic cracking catalysts

Bayraktar

2005

World J Microbiol Biotechnol

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“…Figure 2 suggests that biogenic acids produced by A. niger were largely responsible for its better bioleaching performance. This is consistent with the finding of Castro et al [5], who compared various bacteria and fungi for the leaching of nickel and zinc from calamine and garnierite silicates, and concluded that fungi were more effective due to the production of citric and oxalic acids together with other organic metabolites (e.g., amino acids, peptides and proteins [10]). Therefore, the subsequent set of experiments focused on the leaching behavior of various fungi towards olivine.…”

Section: Bioleaching Of Fresh Olivine By Bacterium Versus Fungussupporting

confidence: 81%

“…These can be classified into two groups: autotrophic bacteria and archaea, and heterotrophic bacteria, archaea and fungi [5]. Autotrophic microorganisms use carbon dioxide as their carbon source, whereas heterotrophic microorganisms use organic compounds as a carbon source.…”

Section: Introductionmentioning

confidence: 99%

Chemoorganotrophic Bioleaching of Olivine for Nickel Recovery

et al. 2014

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Bioleaching of olivine, a natural nickel-containing magnesium-iron-silicate, was conducted by applying chemoorganotrophic bacteria and fungi. The tested fungus, Aspergillus niger, leached substantially more nickel from olivine than the tested bacterium, Paenibacillus mucilaginosus. Aspergillus niger also outperformed two other fungal species: Humicola grisae and Penicillium chrysogenum. Contrary to traditional acid leaching, the microorganisms leached nickel preferentially over magnesium and iron. An average selectivity factor of 2.2 was achieved for nickel compared to iron. The impact of ultrasonic conditioning on bioleaching was also tested, and it was found to substantially increase nickel extraction by A. niger. This is credited to an enhancement in the fungal growth rate, to the promotion of particle degradation, and to the detachment of the stagnant biofilm around the particles. Furthermore, ultrasonic conditioning enhanced the selectivity of A. niger for nickel over iron to a value of 3.5. Pre-carbonating the olivine mineral, to OPEN ACCESSMinerals 2014, 4 554 enhance mineral liberation and change metal speciation, was also attempted, but did not result in improvement as a consequence of the mild pH of chemoorganotrophic bioleaching.

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“…In the study conducted on Aspergillus and Penicillium by Valix et al (2001) it was discovered that a combination of both microbial activities and production of organic acids produced effective leaching of cobalt and nickel. In another study, Castro et al (2000) confirmed the better potential of A. niger compared to bacteria (Bacillus and Pseudomonas) in the leaching of zinc and nickel. Aspergillus niger HNA-1 isolated from the surface of iron ore samples was also used by Delvasto et al (2005) for the desphosphorisation of iron ore while was able to use metabolites produced by Aspergillus sp.…”

Section: Introductionmentioning

confidence: 53%

Mobilisation of potassium and phosphorus from iron ore by ectomycorrhizal fungi

Adeleke

Cloete

Bertrand

et al. 2010

World J Microbiol Biotechnol

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Mutualistic roles of ectomycorrhizal (ECM) fungi have been linked to their ability to produce organic acids that aid in the dissolution of insoluble minerals in the rhizosphere. This ability of ECM fungi was utilised to investigate their potential participation in the mobilisation of nutrients such as phosphorus (P) and potassium (K) from a typical insoluble ore-iron ore. In vitro pure cultures of four different ECM fungi; Pisolithus tinctorius, Paxillus involutus, Phialocephala fortini, and Suillus tomentosus were screened for their ability to mobilise P and K from two types of non-exportable Sishen iron ore. When present in iron ore, these elements are deleterious and reduce the commercial values of the ore. Experiment was set up with different treatments that included two ore types (KGT and SK) and five particle sizes of each ore type. Results indicated the potential of the four fungi to mobilise P and K from the two iron ore types though at different levels. Ore type, particle size, organic acid production and attachment of the fungi to the iron ore were all found to play important roles in the mobilisation of nutrients from these ores.

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Bioleaching of zinc and nickel from silicates using Aspergillus niger cultures

Cited by 123 publications

References 9 publications

Bioleaching of nickel from equilibrium fluid catalytic cracking catalysts

Bioleaching of nickel from equilibrium fluid catalytic cracking catalysts

Chemoorganotrophic Bioleaching of Olivine for Nickel Recovery

Mobilisation of potassium and phosphorus from iron ore by ectomycorrhizal fungi

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