Recovery of rare earth elements from sulfate-rich acid mine water: Looking through the keyhole the exchange reaction for cationic resin

Silva, Gabriela Cordeiro; Bertoli, Alexandre C.; Duarte, Hélio A.; Ladeira, Ana Cláudia Queiroz

doi:10.1016/j.jece.2022.108715

Cited by 8 publications

(13 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the acid effluent of a closed uranium mine in Brazil contains 130 µg/ml REE. This acid effluent is treated with lime to produce a precipitate containing 7 % of REE [133], though there are other methods like ion exchange, solvent extraction, and co-precipitation for their recovery. The , treatment of acid mine drainage is often carried out by neutralization, oxidation, and metal hydroxide precipitation.…”

Section: Acid Mine Drainagementioning

confidence: 99%

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Balaram¹

2023

Preprint

View full text Add to dashboard Cite

Currently, there is increasing industrial demand for rare earth elements (REE) as these elements are now integral to the manufacture of many carbon-neutral technologies. The depleting REE ores and increasing mining costs are prompting to look for alternative sources for these valuable metals, particularly from waste streams. Although REE concentrations in most of the alternate resources are lower than current REE ores, some sources such as marine sediments, coal ash, and industrial wastes like red mud are looking promising with significant concentrations of REE in them. This review focuses on the alternative resources for REE such as ocean bottom sediments, continental shelf sediments, river sediments, stream sediments, lake sediments, phosphorites deposits, industrial waste products like red mud, and phosphogypsum, coal, coal fly ash, and related materials, waste rock sources from old and closed mines, acid mine drainage, and recycling of e-waste. Possible future Moon exploration and mining for REE and other valuable minerals are also discussed. It is evident that REE extractions from both primary and secondary ores alone are not adequate to meet the current demand, and sustainable REE recovery from the alternative resources described here is also necessary to meet the growing REE demand. An attempt is made to identify the potential of these alternative resources and sustainability challenges, benefits, and possible environmental hazards to meet the growing challenges in meeting the future REE requirements.

show abstract

Section: Acid Mine Drainagementioning

confidence: 99%

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Balaram¹

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…However, elution with inorganic acids was not effective in terms of both recovery and fractionation, which showed the need for further studies. In addition, another elution study carried out with cationic resins and using different inorganic eluents (acids and salts) showed that calcium chloride presents the highest elution percentages, managing to elute 100% of light REE and almost 90% of heavy REE adsorbed [20]. However, there was no fractionation.…”

Section: Introductionmentioning

confidence: 99%

“…The most challenging step in REE production is the fractionation into pure elements, as it entails separating elements with closely similar properties. Few works in the literature deal with using ion exchange to recover REE from AMD and focus on concentrating REE, not fractionating them [6,7,19,20]. Table 1 summarizes previous studies regarding the use of ion exchange technique to recover REE from different aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fractionation Columns on the Elution of Rare Earth Elements Recovered from Acid Mine Drainage

Silva,

Souza,

Ferreira

et al. 2024

Minerals

View full text Add to dashboard Cite

Rare earth elements (REE) can be found in expressive contents in different secondary sources, such as acid mine drainage (AMD). This work evaluated separation of light and heavy rare earth elements (REE) from an acid mine drainage (AMD) generated in a former uranium mine in Brazil by using ion exchange. This AMD presents pH 3.50, total REE content of 97 mg L−1 and 1.3 g L−1 of sulfate and was used in the REE loading experiments. Loading experiments were carried out in columns using a commercial strong acid cation (SAC) exchange resin. Elution was performed with 0.01 mol L−1 NH4EDTA in systems with one, two and three columns. Regarding the loading step, the resin presented a total loading capacity of 0.58 mmol g−1. The resin proved to be more selective for light REE with adsorption efficiency of 78% and 48% for heavy REE. Regarding elution, high efficiencies between 90 and 100% were achieved for REE. The final REE solution is approximately 10 times more concentrated in the liquor related to the acid mine water. Better fractionation results were achieved for the system with three columns. Although the complete separation of the REE into pure elements was not possible, two distinct fractions of heavy and light REE could be obtained, and La was completely separated from the other REE. In order to improve fractionation and separate the REE into individual ones, the concentrated fractions can proceed to subsequent ion exchange systems.

show abstract

“…Many works used ion exchange resins containing sulfonic, iminodiacetic and aminophosphonic groups to recover and fractionate REE from different solutions, mainly chloride or nitrate solutions [9][10][11]. However, unlike nitrate and chloride ions, sulphate ions can form multiple complexes with REE, which makes ion exchange more complex [12].…”

Section: Introductionmentioning

confidence: 99%

“…Once the sorption performance of the resins depends on the aqueous medium (chloride, sulphate, nitrate or fluoride), the studies with this type of solution are relevant [12,13]. In previous work from our group with a sample similar to AMD [14], it was demonstrated that the use of strongly acidic cation resin promoted an overall recovery of REE of around 83%.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Chelating Resins Efficiency in Recovering Rare Earth Elements from Sulphate-Rich Acid Solutions

José¹,

Silva

Ladeira

2023

Environmental Protection Research

View full text Add to dashboard Cite

This work investigates the use of chelating resins for recovering rare earth elements (REE) from a laboratory solution with pH and sulphate concentrations similar to those of an acid mine drainage (AMD). The loading experiments were performed in ion exchange columns, fed with a solution at pH 3.5 containing 0.49 g L-1 of REE, 0.06 g L-1 of impurities and 1.11 g L-1 of sulphate ions. The highest loading was obtained for the PUROLITE® MTS 9500 resin activated with Na+, and it was 101.8 mg g-1, which corresponds to a sorption efficiency of 73%. The loading results showed that the resins have greater selectivity for REE over impurities. Regarding elution, greater efficiency (i.e., 96%) was obtained with the resin PUROLITE® MTS 9300; however, this resin presented lower loadings. A final liquor with a maximum REE concentration of 1.72 g L-1 and maximum impurities concentration of 0.02 g L-1 was obtained for PUROLITE® MTS 9500 resin activated with H+, which presents an elution efficiency of 80%.

show abstract

Recovery of rare earth elements from sulfate-rich acid mine water: Looking through the keyhole the exchange reaction for cationic resin

Cited by 8 publications

References 38 publications

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Potential Future Alternative Resources for Rare Earth Elements: Opportunities and Challenges

Effect of Fractionation Columns on the Elution of Rare Earth Elements Recovered from Acid Mine Drainage

Evaluation of Chelating Resins Efficiency in Recovering Rare Earth Elements from Sulphate-Rich Acid Solutions

Contact Info

Product

Resources

About