Recovery of rare earths from industrial wastewater using extraction-precipitation strategy for resource and environmental concerns

Ni, Shuainan; Chen, Qianwen; Gao, Yun; Guo, Xiaoying; Sun, Xiaoqi

doi:10.1016/j.mineng.2020.106315

Cited by 35 publications

(8 citation statements)

References 45 publications

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“…As they are rich in middle and heavy rare earths, ion-adsorption-type rare earth ores (IREOs) are an indispensable strategic resource for modern science and technology [1]. Rare earth elements (REEs) in IREOs are mainly adsorbed in ionic form in kaolinite-based clay minerals [2]. The ion-exchange adsorption properties of minerals are the theoretical basis for the extraction of REEs [3].…”

Section: Introductionmentioning

confidence: 99%

Effects of Salinity and pH on Clay Colloid Aggregation in Ion-Adsorption-Type Rare Earth Ore Suspensions by Light Scattering Analysis

Wang

Liu

2022

Minerals

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Ion-adsorption-type rare earth ores (IREOs) are an indispensable strategic resource. Rare earths can be extracted from IREOs by means of in situ leaching, which is strongly influenced by the migration of clay components. In order to clarify the effect of the interaction between mineral particles on the rare earth leaching process, the aggregation of IREO colloids was investigated in suspension after NaCl concentration and pH value were disturbed based on a light scattering method. The results show that IREO colloids are prone to unstable aggregation, which can be affected by salinity and pH in suspension. Combined with the analysis of the surface acid–base properties and the zeta potential of the IREO colloids, the long-range electrostatic attraction between mineral heterogeneous charge surfaces plays a leading role in the interaction between mineral particles. In suspension, electrolyte concentration and pH can adjust the strength of the electrostatic force and the force field overlapping between the surface double electric layers to influence the aggregation of the IREO colloids. The above conclusion can enrich and supplement the rare earth extraction theory, which has a certain guiding significance for green exploitation of IREOs.

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Section: Introductionmentioning

confidence: 99%

Effects of Salinity and pH on Clay Colloid Aggregation in Ion-Adsorption-Type Rare Earth Ore Suspensions by Light Scattering Analysis

Wang

Liu

2022

Minerals

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“…Ion-exchange and solvent extraction are modern methods that have effectively replaced the classical methods. 8 REEs have been recovered from waste solutions using ionexchange methods, 9,10 chemical precipitation, 11 membrane separation, 12 biosorption, 13 extraction, and adsorption 14 with zeolite, clay, and active carbon. 15 The solvent extraction process has advantages such as low power consumption and continuous system setup, and allows for complete solvent regeneration.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive capacity and kinetic studies of PK216 resin for the extraction of Pr, Gd, and Dy rare earth elements

Hidayah

Roslan

Osazuwa

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUNDThe removal of rare earth elements (REE) ions from aqueous solutions is a challenging task, and it requires a cost‐effective and readily available adsorbent material with excellent performance. In this study, PK216 resin was utilized for the adsorption kinetics and mechanism studies of REE ions owing to its outstanding performance, low cost, and easy availability.RESULTSThe findings revealed that higher loading resulted in increased adsorption capacity, while pH and temperature adjustments had minimal effects on the adsorption process, which remained constant within the pH range of 1–6 and a temperature range of 25–85 °C. Moreover, the thermodynamic parameters showed that the adsorption reaction for praseodymium (Pr) and gadolinium (Gd) was spontaneous and exothermic, whereas for dysprosium (Dy) it was endothermic due to its high hydration enthalpy. This characteristic nature of Dy requires additional energy from the surroundings to dissociate from the aqueous phase and proceed to the PK216 resin surface compared to Pr and Gd. The Langmuir model and pseudo‐second‐order reaction were found to be the fitting models for the adsorption process on PK216 resin. Additionally, the chemisorption of Pr, Gd, and Dy resulted in monolayer coverage. The diffusion process was found to be intraparticle and film diffusion, as it fitted the Boyd kinetic model as opposed to the Weber–Morris intraparticle model.CONCLUSIONThe results indicate that higher loading enhances the adsorption capacity, and the Langmuir model and pseudo‐second‐order reaction are the most suitable models for the adsorption process on PK216 resin. © 2023 Society of Chemical Industry

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“…REEs have never been found to be in the form of pure metal in nature but in the form of oxides, silicates, carbonates, phosphates, and halides. According to the structure and physicochemical properties of REEs, they could be classified as light REEs (La–Nd), middle REEs (Sm–Dy), and heavy REEs (Ho–Lu plus Y). − REEs become extremely important in many industries due to their unique properties, such as aerospace, petrochemical, glass ceramic, and agriculture. − Among the REEs, heavy REEs (HREEs) are identified as super industrial monosodium glutamate for manufacture . For example, Y is broadly applied in rare-earth functional materials such as aluminum alloy, ceramics, and laser crystal.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Data of Separating Yttrium from Heavy Rare Earths via a Phenoxypropionate-Based Ionic Liquid

Gao

Bie

et al. 2023

J. Chem. Eng. Data

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Ion-adsorbed rare-earth minerals often contain high proportions of yttrium; it is a technical challenge to separate yttrium from rare-earth elements (REEs). For the purpose of separating yttrium effectively, a novel ionic liquid [trioctylmethylammonium][(2,6-dimethylheptyl propionate] ([N1888][POPA]) was prepared to separate Y from heavy rare-earth elements (HREEs). The thermodynamic data of the separation process was studied systematically. The extraction mechanism of [N1888][POPA] was demonstrated to be ion association, which conduces to avoid the saponification wastewater. [N1888][POPA] revealed better selectivities for Y and other HREEs (Ho–Lu); also, deionized water could be utilized for stripping the HREE-loaded organic phase. On this basis, the fractional extraction process based on [N1888][POPA] was carried out. This extraction system showed satisfying performance as shown by the fractional extraction, i.e., Y was purified from 85.2 to 99.1 wt % accompanying 85.37% yield by means of nine extraction stages and six scrubbing stages. The developed extraction process has shown application potential in the field of clean production of ion-adsorbed rare-earth minerals.

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Recovery of rare earths from industrial wastewater using extraction-precipitation strategy for resource and environmental concerns

Cited by 35 publications

References 45 publications

Effects of Salinity and pH on Clay Colloid Aggregation in Ion-Adsorption-Type Rare Earth Ore Suspensions by Light Scattering Analysis

Effects of Salinity and pH on Clay Colloid Aggregation in Ion-Adsorption-Type Rare Earth Ore Suspensions by Light Scattering Analysis

Adsorptive capacity and kinetic studies of PK216 resin for the extraction of Pr, Gd, and Dy rare earth elements

Thermodynamic Data of Separating Yttrium from Heavy Rare Earths via a Phenoxypropionate-Based Ionic Liquid

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