Article
Engineering, Chemical
Mehdi Mostajeran, Jean-Michel Bondy, Nicolas Reynier, Rory Cameron
Summary: Global demand for rare earth elements (REEs) has increased due to rapid technological advancements, leading to attention on recovery from secondary sources. Selective separation techniques like ion exchange are required to overcome challenges in recovering REEs with low metal concentration from mine wastes and tailings. This study demonstrates the first attempt at selective recovery of Sc from coal fly ash using ion exchange separation technique.
MINERALS ENGINEERING
(2021)
Article
Biotechnology & Applied Microbiology
Michael Paper, Max Koch, Patrick Jung, Michael Lakatos, Tom Nilges, Thomas B. Brueck
Summary: This study investigated the potential of 12 cyanobacterial strains for biosorption of rare earth elements, and Nostoc sp. 20.02 showed the highest adsorption capacity. Synechococcus elongatus UTEX 2973, Calothrix brevissima SAG 34.79, Desmonostoc muscorum 90.03, and Komarekiella sp. 89.12 were also promising strains. The adsorption of metals by the strains had fast kinetics and pH value had a significant impact on the process.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2023)
Article
Engineering, Environmental
Hao Zhou, Xinyi Yu, Junjun Wang, Guanzhou Qiu, Hongbo Zhao, Li Shen
Summary: This study investigated the non-contact bioleaching of REEs using Aspergillus niger strain and explored the optimal culture and leaching conditions. Metabolomic analysis revealed the differential metabolites produced by the strain before and after leaching, highlighting the important roles of organic acids and their derivatives in the process.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Sabrina F. Lutke, Marcos L. S. Oliveira, Samuel R. Waechter, Luis F. O. Silva, Tito R. S. Cadaval, Fabio A. Duarte, Guilherme L. Dotto
Summary: This study investigates the leaching conditions and mechanisms of rare earth elements (REE) from phosphogypsum (PG). Through experimental design and optimization, high leaching efficiency values were obtained using sulfuric acid at a concentration of 2.9 mol L-1, a solid/liquid ratio of 1.7/20 g mL(-1), and a temperature of 55 C. The leaching kinetics results indicated that most REE reached equilibrium in about 20 minutes, and the mechanism investigation suggested that surface chemical reaction and diffusion through the boundary layer controlled the leaching process.
Review
Chemistry, Applied
Vladimir Rychkov, Evgeny Kirillov, Sergey Kirillov, Grigory Bunkov, Maxim Botalov, Vladimir Semenishchev, Denis Smyshlyaev, Andrey Malyshev, Aslan Taukin, Ata Akcil
Summary: Selection of appropriate method for rare earth element (REE) preconcentration from industrial by-products is challenging. Liquid extraction and ion exchange methods are commonly used, while sorption processes are gaining attention for the recovery of REE from industrial wastes.
SEPARATION AND PURIFICATION REVIEWS
(2022)
Article
Geochemistry & Geophysics
Junnile L. Romero, Carlito Baltazar Tabelin, Ilhwan Park, Richard D. Alorro, Joshua B. Zoleta, Leaniel C. Silva, Takahiko Arima, Toshifumi Igarashi, Takunda Mhandu, Mayumi Ito, Steffen Happel, Naoki Hiroyoshi, Vannie Joy T. Resabal
Summary: Rare earth elements are crucial for green energy applications, but their extraction faces sustainability challenges due to the concentrated global supply. This study investigates a modified extraction chromatographic resin as a promising adsorbent for REE recovery, providing a potential solution for sustainable supply diversification.
Article
Metallurgy & Metallurgical Engineering
Kang-shi Guo, Yan-feng Zhuang
Summary: This study presents a reactive transport model for the in-situ recovery of weathered crust elution-deposited rare earth ores and validates the model through various experiments. The results show that using a single selection coefficient for modeling is acceptable and that Darcy velocity and leaching solution concentration have significant effects on the leaching process. Optimal cessation of leaching solution injection can conserve solution and reduce pollution. The differences in parameters derived from different experiments highlight the need for further investigation.
Article
Metallurgy & Metallurgical Engineering
Atefeh Azizitorghabeh, Harshit Mahandra, Juliana Ramsay, Ahmad Ghahreman
Summary: This study investigates the selective recovery of gold over copper from synthetic and real thiocyanate pregnant leach solution (PLS) using ion exchange resins. The results demonstrate that 100 g/L MTA 5011 resin can achieve 99% gold extraction and 12% copper extraction, while a solution of 0.01 M thiourea (TU) and 0.1 M H2SO4 is the most efficient for gold elution with 70% gold and 4% copper recovery.
Article
Nanoscience & Nanotechnology
Ji-Ming Yu, Da Luo, Zhong-Jie Ma, Bing Zheng, Fang-Fang Cheng, Wei-Wei Xiong
Summary: In this study, the thiostannate K2Sn2S5 (KTS-2) was used as an ion-exchange material for capturing rare-earth elements (REEs) from wastewater, demonstrating excellent performance with removal rates exceeding 95% for all 16 REEs without causing secondary pollution. KTS-2 showed high capture capacity, short equilibrium time, and a high distribution coefficient for Yb3+ ions, making it a promising eco-friendly material for REE ion exchange.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Polymer Science
Ruth Oye Auke, Guilhem Arrachart, Romain Tavernier, Ghislain David, Stephane Pellet-Rostaing
Summary: A solid-phase extraction system was investigated for the extraction and recovery of rare-earth elements. Phenolic ion-exchange resins were synthesized using a non-toxic aromatic dialdehyde as a substitute for toxic formaldehyde. The resins showed a high ion-exchange capacity and the ability to back-extract the rare-earth elements using an acid solution.
Review
Engineering, Biomedical
Huafang Li, Pengyu Wang, Guicai Lin, Jinyan Huang
Summary: Biodegradable metals, a new generation of medical metallic materials, degrade completely in the human body, eliminating the need for further surgeries. However, current biodegradable metal systems have limitations in clinical applications. Alloying with Rare Earth elements, known for their unique properties, is considered as an important strategy to enhance the properties of biodegradable metals. Recent research progress on Rare Earth alloying elements in biodegradable metals and their effects on mechanical properties, degradation behavior, and biocompatibility are summarized in detail.
ACTA BIOMATERIALIA
(2021)
Review
Polymer Science
Gabriel Salfate, Julio Sanchez
Summary: The demand for rare earth elements (REEs) has been increased by contemporary industrial processes and the application of new technologies. However, the increased mining of REEs has led to a supply crisis. Researchers have recently started considering the viability of recovering REEs from secondary sources such as mining wastewaters and acid mine drainage. In order to find more sustainable processes, the performance of various adsorption/ion exchange materials in capturing REEs from water sources is being evaluated.
Article
Chemistry, Physical
Glaydson S. dos Reis, Guilherme L. Dotto, Julien Vieillard, Marcos L. S. Oliveira, Sabrina F. Luetke, Luis F. O. Silva, Eder C. Lima, Nina P. G. Salau, Ulla Lassi
Summary: This study focuses on the application and evaluation of diatomite as an adsorbent for Nd3+, Ce3+, and La3+ rare earth elements (REEs). The results show that diatomite has a porous and cylindrical structure with a specific surface area of 150 m2/g. The diatomite can effectively adsorb cationic REEs, with the uptake percentage increasing in the order of La3+, Ce3+, and Nd3+. Kinetic and equilibrium processes were best described by the Avrami-fractional order (AFO) and Liu isotherm model, respectively. The research demonstrates that diatomite is a sustainable and low-cost adsorbent for REEs recovery from synthetic and real effluents.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Xu Feng, Oznur Onel, Mcalister Council-Troche, Aaron Noble, Roe-Hoan Yoon, John R. Morris
Summary: Synthesized rare earth ion-adsorption clays prepared from kaolinite at basic pH exhibit high rare earth ion-exchange efficiency, with the adsorption of REEs on kaolinite surface concentration being pH dependent.
APPLIED CLAY SCIENCE
(2021)
Article
Engineering, Environmental
Gabriela Cordeiro Silva, Alexandre Carvalho Bertoli, Helio Anderson Duarte, Ana Claudia Queiroz Ladeira
Summary: The ion exchange process for the recovery of rare earth elements from acid waters was studied using experimental and theoretical approaches. The results showed that La had a higher preference than Y during the loading experiments, and approximately 80% of the adsorbed REE could be eluted using a CaCl2 solution. DFT calculations indicated that the functional group in the cation exchange resin acted as a complexing agent.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Metallurgy & Metallurgical Engineering
Arsyad Maulana Dzulqornain, Ana Belen Cueva-Sola, Kyeong Woo Chung, Jin-Young Lee, Rajesh Kumar Jyothi
Summary: This study presents a hydrometallurgical process for the separation of light rare earth elements (LREEs) using oxidation, precipitation, solvent extraction, and stripping techniques. Selective oxidation with potassium permanganate was employed for the separation of cerium (III). Solvent extraction with Cyanex 572 and cross-current scrubbing were used to achieve the separation of lanthanum (III) from neodymium (III) and praseodymium (III).
Article
Metallurgy & Metallurgical Engineering
Bo Chen, Shenxu Bao, Yimin Zhang
Summary: This study investigated the effects of Al, Fe, P, Si and Na on the precipitation characteristics of vanadium in the ultrasound precipitation system. The concentration upper limits and the negative influence on the precipitation kinetics were determined for each impurity. The findings provide theoretical and technical support for the industrial application of ultrasound precipitation technology.
Article
Metallurgy & Metallurgical Engineering
Chunlin He, Mingwei Qi, Yun Liu, Zunzhang Liu, Yuezhou Wei, Toyohisa Fujita, Guifang Wang, Shaojian Ma, Wenchao Yang, Junyuan Gan
Summary: In this study, D201 x 7 resin and tartaric acid were used as materials and complexing agents for the separation of germanium from sulfuric acid solution. The study successfully achieved the separation of germanium and demonstrated the high selectivity and adsorption performance of the resin.
Article
Metallurgy & Metallurgical Engineering
Xiaobo Zhu, Yue Liu, Chen Ma, Wang Li
Summary: A selective and highly effective method for the extraction and separation of V(IV) and Fe(III) using N235 and P507 as solvent extractants is proposed. The pH, composition, and concentration of the extractant mixture have significant effects on the extraction efficiency and separation factor. The mixing of P507 and N235 generates the P507 monomer, which enhances the extraction efficiency and weakens the stability of vanadium containing extraction complex. Cation exchange process forms the extraction complexes.
Article
Metallurgy & Metallurgical Engineering
B. Behnajady, J. Yousefi Seyf, S. Karimi, M. Moradi, M. Sohrabi
Summary: Deep eutectic solvents (DES) have potential as environmentally-friendly solvents for recovering metals from spent lithium-ion batteries (LIBs). Experimental and molecular dynamics simulation results showed that the chloride ions in DES can form complexes with lithium, manganese, and nickel ions, facilitating their extraction.
Review
Metallurgy & Metallurgical Engineering
Sebastian Kinas, Dorota Jermakowicz-Bartkowiak, Anna Dzimitrowicz, Piotr Cyganowski
Summary: The high demand for platinum-group metals (PGMs) and Re in economical and industrial applications related to environmental protection and energy conversion/storage has led to resource scarcity. Thus, it is crucial to recover and recycle these rare metals. This study critically reviews the recent progress in the effective recovery of PGMs and Re from materials relevant to sustainable technologies, emphasizing practical aspects, environmental impact, and issues related to the unit processes of recovery.
Article
Metallurgy & Metallurgical Engineering
Guopeng Yang, Qinggang Li, Guiqing Zhang, Mingyu Wang, Zuoying Cao, Wenjuan Guan, Jiawei Du, Shengxi Wu
Summary: The study proposes an efficient, clean, and economical process for recovering V2O5 from titanium-white waste through hydrogen peroxide stripping and precipitation of vanadium products by heating. Experimental results show that the use of D2EHPA as a modifier prolongs the duration of maximum stripping efficiency, enabling continuous operation.
Article
Metallurgy & Metallurgical Engineering
Guisu Yu, Shuainan Ni, Yun Gao, Ditang Mo, Zhiyuan Zeng, Xiaoqi Sun
Summary: This research proposes a novel green process for the selective recovery of rare earth elements (RE) from spent NdFeB permanent magnet using hydrophobic deep eutectic solvent (HDES). Through optimization of extraction conditions and stripping method, efficient and clean separation and recovery have been achieved.
Article
Metallurgy & Metallurgical Engineering
Jia Li, Xinsheng Wu, Xiaozhou Zhou, Li Zeng, Shengxi Wu, Mingyu Wang, Wenjuan Guan, Zuoying Cao, Qinggang Li, Guiqing Zhang
Summary: This paper presents a complete hydrometallurgical route for the full-component utilization of deep-sea polymetallic nodules (DPN), achieving high recovery efficiency and near-zero waste production with low energy consumption.
Article
Metallurgy & Metallurgical Engineering
Sanae Elmisaoui, Abderrazak M. Latifi, Lhachmi Khamar
Summary: A first principles model is developed to describe the dissolution mechanism of phosphate ore particles in a solution of phosphoric acid. The model accounts for non-uniform size of ore particles using particle size distributions and quantifies their influence on the model predictions. A global estimability analysis is carried out to determine the estimable parameters from experimental data, and the predictions show good agreement with the experimental data. The computed activation energy indicates that diffusion is the rate limiting step of the dissolution process.
