Integration of nanofiltration membranes in recovery options of rare earth elements from acidic mine waters

López, J.; Reig, Mònica; Gibert, Oriol; Cortina, José Luis

doi:10.1016/j.jclepro.2018.11.096

Cited by 53 publications

(15 citation statements)

References 34 publications

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“…In the face of an ever-increasing stringent environmental criteria, applications of RO and NF are gaining acceptance from the mining industry. It is considered that NF offers a good opportunity compared to conventional methods to treat AMD, such as the preferential passage of mono-charged ions (e.g., hydrogen sulfate, protons) allowing for further recovery of sulphuric acid and high rejection of multi-charged ions, such as transition metals and rare earth elements [12]. NF is preferred over RO when treating metal pollutants as it provides a higher permeate flux at a lower pressure while yielding acceptable rejection performance [13].…”

Section: Introductionmentioning

confidence: 99%

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Nanofiltration of Simulated Acid Mine Drainage: Effect of pH and Membrane Charge

Siew¹,

Zedda²,

Велизаров³

2020

Applied Sciences

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Acid mine drainage (AMD) is a severe form of environmental pollution that has the potential to contaminate surface and ground waters by introducing heavy metals and lowering the pH. The feasibility of using nanofiltration (NF) as a potentially attractive and cost-effective remediation method to treat acid mine drainage was investigated in this study. The performance of an acid-stable NF membrane focusing on the effects of the water pH and membrane charge on ion rejection was systematically studied. A single salt solution experiment showed that Mg, Cu, and Mn containing species were highly rejected at above 97%. Below the membrane iso-electric point (IEP), Mn showed an increased rejection of 99%, while Mg and Mn rejections were relatively constant within the investigated pH range of pH 2 to 7. Rejection of monovalent Cl− decreased with increasing concentration of an accompanying divalent SO42−, showing that Donnan related effects are more prominent at higher ionic concentrations. The sulfate rejection decreased drastically below pH 3 due to the formation of HSO4−, which permeated through the membrane, which can be utilized as a way of separation of the metals from the accompanying sulfur-containing compounds. For mixed salt solutions, rejection of silicate dropped from 52% to 38% when magnesium sulfate was added, owing to shielding of the membrane surface charge by Mg2+ ions. The NF process performance with a simulated AMD solution was found to be similar to that with model salt solution experiments, both in terms of ion rejection values and general pH-dependent rejection trends. The results obtained can be used as a fast preliminary tool for evaluating the feasibility of using NF for treating AMD with a given ionic composition and pH.

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Section: Introductionmentioning

confidence: 99%

“…This leads to reduced capital investment, and lower system operating and maintenance costs. Moreover, NF can be used to concentrate and recover target metals from AMD, which can be exploited as an invaluable resource commodity [12,14].…”

Section: Introductionmentioning

confidence: 99%

Nanofiltration of Simulated Acid Mine Drainage: Effect of pH and Membrane Charge

Siew¹,

Zedda²,

Велизаров³

2020

Applied Sciences

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“…Low-concentration REEs were also extracted using a bubbling organic liquid membrane with un-saponified P507 [18]. Nanofiltration membranes [19,20], dispersion micro-extractor membranes [21,22] or hollow-fiber membrane extractor [23] were also considered in recovery options of REEs.…”

Section: Introductionmentioning

confidence: 99%

Recovery of rare earth elements from electronic waste by diffusion dialysis

Hammache

Bensaadi

Berbar

et al. 2021

Separation and Purification Technology

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Recycling rare earth elements (REEs) contained in electronic waste is of utmost importance due to their ever-increasing use in the high-tech sector. In this context, the use of non-polluting techniques represents a real challenge for scientists. In this work, we demonstrated that a clean and energy-efficient process, diffusion dialysis, has great potential for the recovery of neodymium (Nd) and praseodymium (Pr), contained in the Nd-Fe-B magnets of end-of-life computer hard disk drives (HDDs). Four kinds of polymer membranes were prepared by blending cellulose triacetate (CTA) and polyethylenimine (PEI) with the addition of di-(2ethylhexyl) phosphoric acid (D2EHPA), tridodecylamine (TDDA), trioctylamine (TOA) or trioctylphosphine oxide (TOPO). The membranes were first characterized by several techniques such as water uptake, contact angle, ATR-FTIR, SEM, XRD and zeta potential. They were further implemented in diffusion dialysis experiments in which diluted HDDs leachates were used as feed solutions. The relevance of the diffusion dialysis process for the recovery of REEs was demonstrated as it was possible to extract up to 15% of the boron by spontaneous diffusion through the CTA / PEI / TOA membrane in 6 hours with a lab-scale cell operating in batch mode. All membranes were positively charged under the operating conditions and then, REEs (present mainly in the form of trivalent cations Nd 3+ and Pr 3+) were strongly rejected. A fairly good correlation was found between the membrane water uptake and boron transfer, with boric acid molecules passing more easily through the more hydrated membranes. The selectivity factor between boron and REEs resulted from the interplay between the membrane structure, its water uptake ability and surface charge. It was also found to be dependent on the leachate composition. The CTA / PEI / TDDA membrane was found to exhibit the greatest B / REE selectivity factors, with values reaching up to 3706 and 140 for Nd and Pr, respectively. The lower selectivity towards Pr was explained by the weaker Gibbs energy of hydration of Pr 3+ cations compared with Nd 3+ .

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“…However, they are weathered in contact with water and oxygen, releasing metal ions and sulphuric acid (Younger et al, 2002). As a result of the weathering process, the AMW contains elements dissolved in high concentrations, such as heavy metals (e.g., Cu, Zn, Fe, Cd), non-metals (e.g., As, Se) and sulphuric acid (pH = 1-3), as well as rare earth elements (REE) at low concentrations (Ayora et al, 2016;Bwapwa, 2017;López et al, 2019a). For that reason, AMWs are considered a source of valuable metals and a source of process water (García et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Valorisation options for Zn and Cu recovery from metal influenced acid mine waters through selective precipitation and ion-exchange processes: promotion of on-site/off-site management options

Vecino

Reig

López

et al. 2021

Journal of Environmental Management

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Integration of nanofiltration membranes in recovery options of rare earth elements from acidic mine waters

Cited by 53 publications

References 34 publications

Nanofiltration of Simulated Acid Mine Drainage: Effect of pH and Membrane Charge

Nanofiltration of Simulated Acid Mine Drainage: Effect of pH and Membrane Charge

Recovery of rare earth elements from electronic waste by diffusion dialysis

Valorisation options for Zn and Cu recovery from metal influenced acid mine waters through selective precipitation and ion-exchange processes: promotion of on-site/off-site management options

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