Th(IV) transport from nitrate media through hollow fiber renewal liquid membrane

Allahyari, Sareh Ammari; Minuchehr, A.; Ahmadi, Seyyed Javad; Charkhi, Amir

doi:10.1016/j.memsci.2016.08.009

Cited by 17 publications

(10 citation statements)

References 48 publications

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“…None of the configurations showed signs of membrane instability after 3 h. When running the process in HFSLM configuration, the total molar flux is lower while the yttrium molar fraction in the stripping becomes higher. Higher molar flux in HFRLM as compared to HFSLM is in accordance with previous studies on Th 24 and on extraction of Cu(II) from HCl using D2HEPA as the carrier. 29,31 The enhanced mass transfer in HFRLM could be due to the larger amount of liquid membrane phase extending the accumulation period, during which the mass transfer resistance is potentially lower.…”

Section: Comparison Of Configurations 341 Hfrlm and Hfslm Operating I...supporting

confidence: 91%

“…In the HFRLM configuration, organic solution is soaked into the membrane support and also uniformly dispersed into the aqueous strip solution in order to compensate for the loss of organics into the aqueous phase. This improves the long-term membrane stability, accelerates the mass transfer, and leads to improved operation . The stability of HFRLM and the parameters affecting the selectivity and transport rates through the membrane have been explored − in different applications, e.g., thorium recovery from aqueous waste, , extraction of copper(II) and cobalt(II) from waste water, and separation of Nd(III) from mixed REE. , …”

Section: Introductionmentioning

confidence: 99%

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Separation of Rare-Earth Elements Using Supported Liquid Membrane Extraction in Pilot Scale

Alemrajabi

Ricknell

Samak

et al. 2022

Ind. Eng. Chem. Res.

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The use of supported liquid membrane extraction for recovery and separation of rare-earth elements (REEs) has been investigated. Experiments have been carried out using the different configurations: (1) standard hollow fiber supported liquid membrane operation (HFSLM), (2) renewal liquid membrane operation (HFRLM), and (3) emulsion pertraction technology (EPT). The experiments were performed in pilot scale using a hollow fiber module with a mass transfer surface area of 8 m2. Synthetic feed solution was used with compositions based on a process for recovery of REE from an apatite concentrate. The total concentration of REE in the feed was varied from 1 to 22 mM REE and the pH was varied in the range 1.5–3.2. Di(2-ethylhexyl) phosphoric acid (D2HEPA) diluted in kerosene, 10% (v/v), was used as the organic membrane solution, and 3 M HCl was used as stripping solution. In supported liquid membrane extraction, the extraction performance is governed by both the kinetics of REE transport through the membrane and by thermodynamics. The effect of feed composition on the selectivity and transport of REE through the liquid membrane have been investigated. The results show that the liquid membrane is more selective toward the heavy REE at lower pH values and higher REE concentration. HFRLM shows a higher transport rate than HFSLM, while the HFSLM configuration gives a higher selectivity toward individual REE. The membrane performance in HFSLM configuration rapidly decays with time, while in the HFRLM and EPT configurations, the performance is much more stable. Possible mechanisms for decaying membrane performance are discussed, and gel formation is identified as being of significant importance. Gel formation is observed at an organic loading above ∼46% for Nd, 38% for Y, 46% for Dy, and 65% for Er. The work performed in this study serves as an initial step to demonstrate that HFRLM and EPT can provide stable operation and be feasible options for processing of REE liquors. A process flow diagram for the recovery of the REE, present in the apatite concentrate, in three fractions is proposed based on the results from this study.

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Section: Comparison Of Configurations 341 Hfrlm and Hfslm Operating I...supporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Separation of Rare-Earth Elements Using Supported Liquid Membrane Extraction in Pilot Scale

Alemrajabi

Ricknell

Samak

et al. 2022

Ind. Eng. Chem. Res.

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“…The equilibrium constant of eqn 14is 0.6. 24 In our previous work, 25 the parameters of empirical correlations for k R and k s , mentioned in eqn (12) and 13, were modied and have been used in this study. In addition D eff has been considered as equal to 9.2 Â 10 À11 m 2 s À1 due to the following equation:…”

Section: Th 4þmentioning

confidence: 99%

“…This indicates that the mass transfer resistance in the tube side is higher than the shell side, which is in agreement with our previous study. 25 Enhancement of the tube side velocity causes a decrease in the renewal layer thickness and an increase in the renewal rate of organic layer at the inner surface of hollow ber, which leads to an increase in the local mass transport coefficient. Furthermore, Fig.…”

Section: Effect Of Ow Ratementioning

confidence: 99%

Th(iv) recovery from aqueous waste via hollow fiber renewal liquid membrane (HFRLM) in recycling mode: modelling and experimental validation

et al. 2017

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“…The differences between SLM and LLX systems are as follows: unlike a LLX system, in a SLM process, extraction and stripping processes are carried out in a single stage and a carrier was used within a solid porous membrane is impregnated, as its consumption is less than the amount used in a LLX system. Moreover, easy operation, lower consumption of energy, ease of scaling up, and low investment are the other advantages of SLM systems (Ammari Allahyari et al 2016;Duan et al 2017b;Jahanmahin et al 2016;Swain et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling for facilitated transport of Ge(IV) through supported liquid membrane containing Alamine 336

et al. 2017

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A mathematical model was developed for the germanium facilitated transport from a medium containing tartaric acid using Alamine 336 as a carrier. Modeling was carried out based on the extraction constant (K ext) obtained from the liquid-liquid extraction (LLX) modeling. The LLX data was achieved from experiments with conditions being Alamine 336 concentrations of 0.1-10 %v/v from a solution containing about 1.378 mmol/L Ge (100 mg/L) and tartaric acid as an anionic complexant. The LLX model was attained using the equilibrium-based procedure and fitted to extraction experimental data for various carrier concentrations. This model presented an accurate extraction constant (K ext =0.02) used in the facilitated transport modeling. The flat sheet supported liquid membrane (FSSLM) experiments were conducted in the condition of 1.378 mmol/L Ge (100 mg/L), tartaric acid concertation of 2.760 mmol/L, 1 M HCl as a stripping phase and various Alamine 336 concentrations in the range of 0 to 35 %v/v. The FSSLM model was developed according to the Fick's law, the diffusional transport, and equilibrium equations. According to the model, mass transfer and diffusion coefficients for various concentrations of the carrier were found. In addition, the calculated and experimental values had a good correlation with together showing the validity of the model. This model can be used in the further process simulation such as hollow fiber SLMs.

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Th(IV) transport from nitrate media through hollow fiber renewal liquid membrane

Cited by 17 publications

References 48 publications

Separation of Rare-Earth Elements Using Supported Liquid Membrane Extraction in Pilot Scale

Separation of Rare-Earth Elements Using Supported Liquid Membrane Extraction in Pilot Scale

Th(iv) recovery from aqueous waste via hollow fiber renewal liquid membrane (HFRLM) in recycling mode: modelling and experimental validation

Mathematical modeling for facilitated transport of Ge(IV) through supported liquid membrane containing Alamine 336

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