Precipitation of rare earth elements from acid mine drainage by CO2 mineralization process

Hassas, Behzad Vaziri; Rezaee, Mohammad Ahangarzadeh; Pisupati, Sarma V.

doi:10.1016/j.cej.2020.125716

Cited by 57 publications

(24 citation statements)

References 58 publications

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“…2−4 These complexities have driven interest in obtaining REEs more sustainably from low-grade but abundant nontraditional sources, such as coal byproducts, mine effluents [e.g., acid mine drainage (AMD)], and recycling from electronic waste (E-waste). 5,6 The discovery that biology is able to selectively recognize and utilize the lighter lanthanides, especially La−Nd, 7−12 offers new possibilities for efficient biotechnologies to meet these challenges. 13 This promise has been accelerated with the recent identification of the first native, selective biological chelator for the lanthanides, lanmodulin (LanM).…”

Section: ■ Introductionmentioning

confidence: 99%

“…However, low-grade natural sources of REEs like AMD are acidic and contain very low REE concentrations, <1 ppm, and Tb III at parts per billion levels (1 ppb Tb III ≈ 6 nM). 6 Indeed, to the best of our knowledge, no luminescence-based sensors have been successfully deployed to quantify, or even detect, terbium at natural levels in these matrices.…”

Section: ■ Introductionmentioning

confidence: 99%

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Probing Lanmodulin’s Lanthanide Recognition via Sensitized Luminescence Yields a Platform for Quantification of Terbium in Acid Mine Drainage

2021

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Lanmodulin is the first natural, selective macrochelator for f elementsa protein that binds lanthanides with picomolar affinity at 3 EF hands, motifs that instead bind calcium in most other proteins. Here, we use sensitized terbium luminescence to probe the mechanism of lanthanide recognition by this protein as well as to develop a terbium-specific biosensor that can be applied directly in environmental samples. By incorporating tryptophan residues into specific EF hands, we infer the order of metal binding of these three sites. Despite lanmodulin’s remarkable lanthanide binding properties, its coordination of approximately two solvent molecules per site (by luminescence lifetime) and metal dissociation kinetics (k off = 0.02–0.05 s–1, by stopped-flow fluorescence) are revealed to be rather ordinary among EF hands; what sets lanmodulin apart is that metal association is nearly diffusion limited (k on ≈ 109 M–1 s–1). Finally, we show that Trp-substituted lanmodulin can quantify 3 ppb (18 nM) terbium directly in acid mine drainage at pH 3.2 in the presence of a 100-fold excess of other rare earths and a 100 000-fold excess of other metals using a plate reader. These studies not only yield insight into lanmodulin’s mechanism of lanthanide recognition and the structures of its metal binding sites but also show that this protein’s unique combination of affinity and selectivity outperforms synthetic luminescence-based sensors, opening the door to rapid and inexpensive methods for selective sensing of individual lanthanides in the environment and in-line monitoring in industrial operations.

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Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Probing Lanmodulin’s Lanthanide Recognition via Sensitized Luminescence Yields a Platform for Quantification of Terbium in Acid Mine Drainage

2021

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“…Once saturated, the metal ions will precipitate from the solution as a cluster of corresponding metal oxo/hydroxo species. Depending on the solution matrix and chemical characteristics, different metal ions precipitate in different pH ranges; therefore, products with elevated critical element contents can be obtained by collecting the precipitates formed in certain pH ranges (Honaker et al, 2018;Vaziri Hassas et al, 2020;Zhang and Honaker, 2020). As for sulfide precipitation, it has received attention over the past decade due to several advantages, such as the high degree of metal removal even at low pH, low reactor detention time requirement, higher dewaterability of metal sulfides compared with metal hydroxide sludge, and especially the possibility of separating similar metal ions (Lewis and Van Hille, 2006;Lewis, 2010;Macingova and Luptakova, 2012;Sampaio et al, 2010Sampaio et al, , 2009.…”

Section: Introductionmentioning

confidence: 99%

Process development for recovering critical elements from acid mine drainage

Li¹,

Zhang²

2022

Resources, Conservation and Recycling

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“…Researchers have also used other precipitants to promote better recovery and selectivity. For example, Hassas et al exploited the CO 2 mineralization process to precipitate RE-carbonates from acid mine drainage with 85% of REE recovery in the optimal conditions [25]. Despite these developments, the most common industrial precipitant for REE recovery from strongly acidic solutions is oxalic acid [25,26].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Hassas et al exploited the CO 2 mineralization process to precipitate RE-carbonates from acid mine drainage with 85% of REE recovery in the optimal conditions [25]. Despite these developments, the most common industrial precipitant for REE recovery from strongly acidic solutions is oxalic acid [25,26]. The oxalate ion has a strong affinity to REEs, which in turn prompts high selectivity and high recovery at low pH points.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Experimental and Theoretical Approach to Optimize Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates by Oxalic Acid Precipitation

2022

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The development of processing techniques for the extraction of rare earth elements and critical minerals (REE/CM) from acid mine drainage precipitates (AMDp) has attracted increased interest in recent years. Processes under development often utilize a standard hydrometallurgical approach that includes leaching and solvent extraction followed by oxalic acid precipitation and calcination to produce a final rare earth oxide product. Impurities such as Ca, Al, Mn, Fe and Mg can be detrimental in the oxalate precipitation step and a survey of the literature showed limited data pertaining to the REE precipitation efficiency in solutions with high impurity concentrations. As such, a systematic laboratory-scale precipitation study was performed on a strip solution generated by the acid leaching and solvent extraction of an AMDp feedstock to identify the optimal processing conditions that maximize REE precipitation efficiency and product purity while minimizing the oxalic acid dosage. Given the unique chemical characteristics of AMDp, the feed solution utilized in this study contained a moderate concentration of REEs (440 mg/L) as well a significant concentration (>7,000 mg/L total) of non-REE contaminants such as Ca, Al, Mn, Fe and Mg. Initially, a theoretical basis for the required oxalic acid dose, optimal pH and predicted precipitation efficiency was established by solution equilibrium calculations. Following the solution chemistry calculations, bench-scale precipitation experiments were conducted and these test results indicate that a pH of 1.5 to 2, a reaction time of more than 2 h and an oxalic acid dosage of 30 to 40 g/L optimized the REEs recovery of at ~95% to nearly 100% for individual REE species. The test results validated the optimal pH predicted by the solution chemistry calculations (1.5 to 5); however, the predicted dosage needed for complete REE recovery (10 g/L) was significantly lower than the experimentally-determined dosage of 30 to 40 g/L. The reason for this discrepancy was determined to be due to the large concentration of impurities and large number of potential metal complexes that cause inaccuracies in the solution equilibrium calculations. Based on these findings, a hybrid experimental and theoretical approach is proposed for future oxalic acid precipitation optimization studies.

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Precipitation of rare earth elements from acid mine drainage by CO2 mineralization process

Cited by 57 publications

References 58 publications

Probing Lanmodulin’s Lanthanide Recognition via Sensitized Luminescence Yields a Platform for Quantification of Terbium in Acid Mine Drainage

Probing Lanmodulin’s Lanthanide Recognition via Sensitized Luminescence Yields a Platform for Quantification of Terbium in Acid Mine Drainage

Process development for recovering critical elements from acid mine drainage

A Hybrid Experimental and Theoretical Approach to Optimize Recovery of Rare Earth Elements from Acid Mine Drainage Precipitates by Oxalic Acid Precipitation

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