Diversity and activity of phosphate bioleaching bacteria from a high-phosphorus iron ore

Delvasto, Pedro; Valverde, Ángel; Ballester, A.; Muñoz, J.A.; González, F.; Blázquez, M.L.; Igual, José M.; García-Balboa, C.

doi:10.1016/j.hydromet.2008.02.007

Cited by 105 publications

(52 citation statements)

References 24 publications

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“…In this respect, the bioleaching properties of Leifsonia spp. have been widely recognized (Hansen et al 2007;Delvasto et al 2008;Frey et al 2010).…”

Section: Microbial Community Along Transectmentioning

confidence: 99%

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

et al. 2012

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Glacier forelands are excellent sites in which to study microbial succession because conditions change rapidly in the emerging soil. Development of the bacterial community was studied along two transects on lateral moraines of Ecology Glacier, King George Island, by culture-dependent and culture-independent approaches (denaturating gradient gel electrophoresis). Environmental conditions such as cryoturbation and soil composition affected both abundance and phylogenetic diversity of bacterial communities. Microbiocenosis structure along transect 1 (severe cryoturbation) differed markedly from that along transect 2 (minor cryoturbation). Soil physical and chemical factors changed along the chronosequence (time since exposure) and influenced the taxonomic diversity of cultivated bacteria, particularly along transect 2. Arthrobacter spp. played a pioneer role and were present in all soil samples, but were most abundant along transect 1. Cultivated bacteria isolated from transect 2 were taxonomically more diverse than those cultivated from transect 1; those from transect 1 tended to express a broader range of enzyme and assimilation activities. Our data suggest that cryoturbation is a major factor in controlling bacterial community development in postglacial soils, shed light on microbial succession in glacier forelands, and add a new parameter to models that describe succession phenomena.

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“…In this respect, the bioleaching properties of Leifsonia spp. have been widely recognized (Hansen et al 2007;Delvasto et al 2008;Frey et al 2010).…”

Section: Microbial Community Along Transectmentioning

confidence: 99%

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

et al. 2012

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“…The first method is the direct enrichment culture method where the mineral is added to a defined medium for the purpose of isolation and leaching of the mineral (Goebel and Stackerbrandt, 1994). The other method involves direct isolation from the surface of the mineral and subsequent utilisation of the isolates for leaching processes (Delvasto et al, 2008). This study followed the first method which allowed the isolation of two fungal isolates namely NTS-1 and NTS-2.…”

Section: Resultsmentioning

confidence: 99%

FUNGAL LEACHING OF IRON ORE: ISOLATION, CHARACTERIZATION AND BIOLEACHING STUDIES OF <i>PENICILLIUM VERRUCULOSUM</i>

Chaudhary¹,

Banerjee²,

Ibrahim³

et al. 2014

American Journal of Microbiology

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Pyrometallurgical and hydrometallurgical technologies for recovery of metals from low grade ores require high energy and capital costs. Use of microorganisms in leaching of mineral ores is gaining importance due to the implementation of stricter environmental rules. Microbes convert metal compounds into their water soluble forms and are biocatalysts of leaching processes. This study was performed to isolate and characterize iron solubilizing fungi from low grade iron ore for bioleaching process. Soil samples from iron mine area were used for isolation of iron solubilizing fungi and two fungal species (NTS-1 and NTS-2) were obtained from enrichment culture method. Bioleaching experiments were carried out in batch culture to determine the iron solubilising efficiencies of the isolates. Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) was used to determine the solubilized iron concentration and strain NTS-2 exhibited 40% higher iron solubilization than strain NTS-1. The strain was subjected to 18S-ITS sequence of rRNA studies and the phylogenetic analyses justify a taxonomic position for the strain as a member of Penicillium verruculosum. The isolated strain could be used in solubilizing iron from low grade ores as an efficient, economical and eco-friendly alternative to conventional operations.

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“…However, the acid-leaching method causes equipment corrosion and environmental pollution in addition to high operation cost. Bio-leaching is another method for removal of phosphorus from high phosphorus iron ores [17][18][19]. For example, more than 80% phosphorus was removed from iron ore containing 1.04% phosphorus after 21 days of leaching using sulfur-oxidizing bacteria with a particle size +0.074-0.1 mm.…”

Section: Introductionmentioning

confidence: 99%

Reaction Behavior of Phosphorus in Coal-Based Reduction of an Oolitic Hematite Ore and Pre-Dephosphorization of Reduced Iron

Gao

Han

et al. 2016

Metals

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Coal-based reduction followed by magnetic separation is an effective way to recover iron from high phosphorus-containing oolitic hematite ore. Given that high quantities of dephosphorization agent are needed to obtain low phosphorus reduced iron, a novel approach is proposed by the authors. Without prior phosphorus removal, the phosphorus was enriched in the reduced iron during a reduction process, then high-phosphorus reduced iron was refined to low phosphorus molten iron and high phosphorus dephosphorization slag to be used as a phosphate fertilizer. The influences of various parameters, including the reduction temperature, the reduction time, and the C/O molar ratio, on the reaction behavior of phosphorus during reduction process were studied. Experimental results indicate that a higher reduction temperature, a longer reduction time, or a higher C/O molar ratio was favorable for the reduction of apatite to phosphorus and the enrichment of phosphorus in reduced iron. X-ray diffraction (XRD) analysis demonstrated that the apatite was reduced to phosphorus and Ca 2 SiO 4 (or Ca(Al 2 Si 2 O 8 )) in the presence of SiO 2 and Al 2 O 3 , whilst the phosphorus enriched in reduced iron formed Fe 3 P. The migration behavior of phosphorus was investigated using line scanning analysis of reduction products at different reduction times. The results show that the phosphorus primarily existed in the slag phase 10 min before reduction, and a large amount of phosphorus migrated into iron phase from slag phase with a reduction time of 40 min. The phosphorus content in the iron phase only slightly changed after 50 min. The pre-dephosphorization of reduced iron was performed at 1873 K, indicating a higher basicity or Fe t O content of CaO-based slag was beneficial to dephosphorization of the reduced iron.

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Diversity and activity of phosphate bioleaching bacteria from a high-phosphorus iron ore

Cited by 105 publications

References 24 publications

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

Culturable bacteria community development in postglacial soils of Ecology Glacier, King George Island, Antarctica

FUNGAL LEACHING OF IRON ORE: ISOLATION, CHARACTERIZATION AND BIOLEACHING STUDIES OF <i>PENICILLIUM VERRUCULOSUM</i>

Reaction Behavior of Phosphorus in Coal-Based Reduction of an Oolitic Hematite Ore and Pre-Dephosphorization of Reduced Iron

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