Bioleaching of trace elements and rare earth elements from coal fly ash

Park, Stephen; Liang, Yanna

doi:10.1007/s40789-019-0238-5

Cited by 66 publications

(21 citation statements)

References 38 publications

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“…Harsh leaching conditions with concentrated acid solutions at higher temperatures are normally required to achieve satisfactory recovery. In addition to the direct acid leaching, REE extraction from fly ash using bioleaching was also reported [108]. Three microbial strains, Candida bombicola, Phanerochaete chrysosporium, and Cryptococcus curvatus, were tested by Park and Liang in terms of REE extraction from fly ash.…”

Section: Acid Leaching Of Rees From Coal Combustion Ashesmentioning

confidence: 99%

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A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

et al. 2020

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Many studies have been published in recent years focusing on the recovery of rare earth elements (REEs) from coal-related materials, including coal, coal refuse, coal mine drainage, and coal combustion byproducts particularly fly ash. The scientific basis and technology development have been supported by coal geologists and extractive metallurgists, and through these efforts, the concept has progressed from feasibility assessment to pilot-scale production over the last five years. Physical beneficiation, acid leaching, ion-exchange leaching, bio-leaching, thermal treatment, alkali treatment, solvent extraction, and other recovery technologies have been evaluated with varying degrees of success depending on the feedstock properties. In general, physical beneficiation can be a suitable low-cost option for preliminary upgrading; however, most studies showed exceedingly low recovery values unless ultrafine grinding was first performed. This finding is largely attributed to the combination of small RE-bearing mineral particle size and complex REE mineralogy in coal-based resources. Alternatively, direct chemical extraction by acid was able to produce moderate recovery values, and the inclusion of leaching additives, alkaline pretreatment, and/or thermal pretreatment considerably improved the process performance. The studies reviewed in this article revealed two major pilot plants where these processes have been successfully deployed along with suitable solution purification technologies to continuously produce high-grade mixed rare earth products (as high as +95%) from coal-based resources. This article presents a systematic review of the recovery methods, testing outcomes, and separation mechanisms that are involved in REE extraction from coal-related materials. The most recent findings regarding the modes of occurrence of REEs in coal-related materials are also included.

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Section: Acid Leaching Of Rees From Coal Combustion Ashesmentioning

confidence: 99%

“…Three microbial strains, Candida bombicola, Phanerochaete chrysosporium, and Cryptococcus curvatus, were tested by Park and Liang in terms of REE extraction from fly ash. Candida bombicola provided the optimal results with 63% Sc, 62.2% Y, 67.7% Yb, 64.4% Er, 60% Dy, and 51.9% Gd being extracted at 28 • C for 6 h [108].…”

Section: Chemical/thermal Pretreatmentmentioning

confidence: 99%

A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

et al. 2020

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“…In this work, in a first approach, the release of tungsten (W), a critical raw material according to the European Commission 30 was followed by both biostimulations of the autochthonous microbial community and by bioaugmentation with an autochthonous strain, under different conditions. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was used to study the metal release in the leachate during the incubation period 31 . This technique was chosen primarily due to its high accuracy, low detection limit and the possibility to use multi-element external standards 32 , which allows for the calibration of a greater number of elements.…”

Section: Introductionmentioning

confidence: 99%

Post-measurement compressed calibration for ICP-MS-based metal quantification in mine residues bioleaching

Rito

Almeida

Coimbra

et al. 2022

Sci Rep

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Bioleaching is an actual economical alternative to treat residues, which allows, depending on the chosen strategy, two possible outcomes: (1) a leachate enriched with target metals, or (2) a residue enriched in target metals through the leaching of interfering components (IC). This work aimed to study the metals released by bioprocessing the Panasqueira mine tailings, as a strategy to increase critical metals' relative concentration in residues. Biostimulation of the local microbiota was compared to a bioaugmentation approach using the autochthonous Diaphorobacter polyhydroxybutyrativorans strain B2A2W2. Inductively Coupled Plasma Mass Spectrometry (ICP-MS) was selected to study the metals released in the leachate through multi-element external standards. A new data treatment method was developed to use a preliminary sweep of intensities to quantify the non-initial target metals concentration in the leachate, based on preliminary ICP-MS intensity measurements. The results demonstrated that biostimulation was an efficient bioleaching strategy for the IC silicon, aluminium, magnesium, selenium, manganese, zinc, iron, and copper, by decreasing concentration, resulting in a relative increase in the gallium and yttrium (10x) levels in the treated residue. The strategy followed to quantify a large number of elements with ICP-MS using a reduced number of data points for calibration proved valid and speeded up the analytical process.

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“…Several recent studies have investigated bioleaching REEs from substrates other than monazite. This includes leaching REEs from bastnaesite, another important REE bearing ore (Zhang et al, 2018), and bioleaching to recover REEs from waste products including spent catalysts, rare earth magnets, and coal fly ash (Auerbach et al, 2019;Jin et al, 2019;Park and Liang, 2019).…”

Section: Introductionmentioning

confidence: 99%

Metabolomic Analysis Reveals Contributions of Citric and Citramalic Acids to Rare Earth Bioleaching by a Paecilomyces Fungus

2020

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Conventional methods for extracting rare earth elements from monazite ore require high energy inputs and produce environmentally damaging waste streams. Bioleaching offers a potentially more environmentally friendly alternative extraction process. In order to better understand bioleaching mechanisms, we conducted an exo-metabolomic analysis of a previously isolated rare earth bioleaching fungus from the genus Paecilomyces (GenBank accession numbers KM874779 and KM 874781) to identify contributions of compounds exuded by this fungus to bioleaching activity. Exuded compounds were compared under two growth conditions: growth with monazite ore as the only phosphate source, and growth with a soluble phosphate source (K 2 HPO 4 ) added. Overall metabolite profiling, in combination with glucose consumption and biomass accumulation data, reflected a lag in growth when this organism was grown with only monazite. We analyzed the relationships between metabolite concentrations, rare earth solubilization, and growth conditions, and identified several metabolites potentially associated with bioleaching. Further investigation using laboratory prepared solutions of 17 of these metabolites indicated statistically significant leaching contributions from both citric and citramalic acids. These contributions (16.4 and 15.0 mg/L total rare earths solubilized) accounted for a portion, but not all, of the leaching achieved with direct bioleaching (42 ± 15 mg/L final rare earth concentration). Additionally, citramalic acid released significantly less of the radioactive element thorium than did citric acid (0.25 ± 0.01 mg/L compared to 1.18 ± 0.01 mg/L), suggesting that citramalic acid may have preferable leaching properties for a monazite bioleaching process.

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Bioleaching of trace elements and rare earth elements from coal fly ash

Cited by 66 publications

References 38 publications

A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

A Comprehensive Review of Rare Earth Elements Recovery from Coal-Related Materials

Post-measurement compressed calibration for ICP-MS-based metal quantification in mine residues bioleaching

Metabolomic Analysis Reveals Contributions of Citric and Citramalic Acids to Rare Earth Bioleaching by a Paecilomyces Fungus

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