Leaching of rare earth elements from coal ashes using acidophilic chemolithotrophic microbial communities

Muravyov, Maxim; Булаев, А. Г.; Melamud, V. S.; Tf, Kondrat'eva

doi:10.1134/s0026261715010087

Cited by 36 publications

(15 citation statements)

References 5 publications

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“…As shown in Table 3, the TREE content in the studied kaolinite sample was 245 ppm, which is higher than that in Upper Continental Crust (168.4 ppm) and the average content of World coals (68.5 ppm) [57]. Moreover, several studies have proved it is feasible to extract REEs from materials with a similar level of REE content, such as bauxite residue (259 ppm), coal ashes (239.6 ppm), and phosphate rock tailings (162 ppm) [58][59][60]. Therefore, the kaolinite sample used in this study has a great potential to become an alternative source of REEs.…”

Section: Sample Characterizationmentioning

confidence: 78%

Rare earth elements (REEs) recovery and porous silica preparation from kaolinite

Zhang

2021

Powder Technology

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Section: Sample Characterizationmentioning

confidence: 78%

Rare earth elements (REEs) recovery and porous silica preparation from kaolinite

Zhang

2021

Powder Technology

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“…19 Although they have relatively low REE concentrations, geofluids are abundant and have the advantage of requiring minimal pretreatment prior to REE extraction, unlike solid feedstocks such as ores and ion adsorption clays, for which chemical leaching is generally required. 19,25,31 Herein, we systematically examined the effects of TDS, competing metals, pH, and temperature on REE adsorption efficiency and selectivity. Results define the geochemical conditions that are amenable to REE biosorption, information that is key to the future development of a high-performance biosorption technology for REE recovery from geofluids.…”

Section: ■ Introductionmentioning

confidence: 99%

Recovery of Rare Earth Elements from Geothermal Fluids through Bacterial Cell Surface Adsorption

Brewer

Chang

Park

et al. 2019

Environ. Sci. Technol.

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The increasing demand for rare earth elements (REEs) in the modern economy motivates the development of novel strategies for cost-effective REE recovery from nontraditional feedstocks. We previously engineered E. coli to express lanthanide binding tags on the cell surface, which increased the REE biosorption capacity and selectivity. Here we examined how REE adsorption by the engineered E. coli is affected by various geochemical factors relevant to geothermal fluids, including total dissolved solids (TDS), temperature, pH, and the presence of specific competing metals. REE biosorption is robust to TDS, with high REE recovery efficiency and selectivity observed with TDS as high as 165,000 ppm. Among several metals tested, U, Al, and Pb were found to be the most competitive, causing >25% reduction in REE biosorption when present at concentrations ∼3to 11-fold higher than the REEs. Optimal REE biosorption occurred between pH 5−6, and sorption capacity was reduced by ∼65% at pH 2. REE recovery efficiency and selectivity increased as a function of temperature up to ∼70°C due to the thermodynamic properties of metal complexation on the bacterial surface. Together, these data define the optimal and boundary conditions for biosorption and demonstrate its potential utility for selective REE recovery from geofluids.

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“…In the same study, by using Pseudomonas aeruginosa, the REE leaching efficiency was 63.5%. The only study that focused on coal ash was reported by Muravyov et al (2015) where leaching efficiency of three REEs were listed. All other studies have target different raw materials (Desouky et al 2011;Ibrahim and El-Sheikh 2011;Shin et al 2015) and the results are difficult to be compared.…”

Section: Leaching Efficiency (%)mentioning

confidence: 99%

“…With regard to Uraniferous Gibbsite ore containing 4,900 ppm of REEs, 55.1% of which was leached by the presence of an Acidithiobacillus ferrooxidans strain cultivated at 30°C (Ibrahim and El-Sheikh 2011). Regarding coal ash studied in Russia, through incubation with an acidophilic chemolithotrophic microbial community, 52%.0, 52.6%, and 59.5% of Se, Y and La were recovered, respectively (Muravyov et al 2015). Use of other microbial strains, however, resulted in REE leaching efficiencies of \ 0.2% on Monazite-bearing ore (Shin et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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

Park

Liang

2019

Int J Coal Sci Technol

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Coal fly ash originated from coal combustion has high concentrations of metals. If suitable leaching techniques are identified, then coal fly ash could serve as a useful source of valuable minerals including rare earth elements (REEs). In this study, three microbial strains, Candida bombicola, Phanerochaete chrysosporium and Cryptococcus curvatus were tested on their performance of leaching trace elements and REEs from fly ash. Through comparing mineral loss and leaching efficiencies resulting from indirect leaching or use of the culture supernatant, C. bombicola was identified to be the best leading to the highest mineral loss and extracting efficiencies of trace elements and REEs among the three strains. The highest mineral loss observed from using the supernatant of this yeast strain was 59.7%. Among all trace elements, As and Mo had the highest leaching efficiency of 80.9% and 79.5%, respectively. The same leaching test led to 67.7% of Yb and 64.6% of Er dissolved from the ash. This study, thus, demonstrated that bioleaching is feasible for leaching metals out of fly ash. The C. bombicola strain deserves further investigation due to its robust actions on metal leaching. Keywords Cryptococcus curvatus Á Candida bombicola Á Phanerochaete chrysosporium Á Coal fly ash Á Bioleaching Á Rare earth elements Á Trace metals Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the

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Leaching of rare earth elements from coal ashes using acidophilic chemolithotrophic microbial communities

Cited by 36 publications

References 5 publications

Rare earth elements (REEs) recovery and porous silica preparation from kaolinite

Rare earth elements (REEs) recovery and porous silica preparation from kaolinite

Recovery of Rare Earth Elements from Geothermal Fluids through Bacterial Cell Surface Adsorption

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

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