Article
Chemistry, Applied
Jingjing Dai, Denghong Wang, Zhenghui Chen
Summary: Ion-absorption rare earth ores are a significant mineral resource in China, but unauthorized mining has led to serious water pollution and REE wastage. Reflectance spectroscopy is shown to be a suitable and cost-effective technique for estimating the concentration of dissolved REEs in water bodies near mines. The study established linear regression models for estimating the total concentration of REEs based on their reflectance characteristics, with a detection limit of about 30 μg/L.
JOURNAL OF RARE EARTHS
(2021)
Article
Metallurgy & Metallurgical Engineering
Binyuan Gao, Min Gan, Chongran Sun, Hui Chen, Xi Liu, Qianzi Liu, Yuguang Wang, Haina Cheng, Hongbo Zhou, Zhu Chen
Summary: A cell-free cascade enzymatic process was developed to produce gluconate from low-cost rice straw as an alternative to ammonium sulfate for leaching ion-adsorption rare earth ores. Compared to fermentation, the enzymatic process showed higher yield and superior leaching efficiency. This study provides a new avenue for potentially economical production of biogenic lixiviants from renewable and cheap feedstocks.
Article
Geosciences, Multidisciplinary
T. Brenko, S. Borojevic Sostaric, T. Karavidovic, S. Ruzicic, T. Sekelj Ivancan
Summary: The study investigated the mineralogical and geochemical characteristics of local bog iron and roasted iron ores in the Podravina region. Different mineral compositions and distributions were found in various types of ores, with iron having little influence on the behavior of rare earth elements and microelements. The use of microelements and REEs as tracers established a geographical connection between bog iron ores and roasted iron ores in the area.
Article
Energy & Fuels
James C. Hower, John G. Groppo, Heileen Hsu-Kim, Ross K. Taggart
Summary: The distribution of Rare Earth elements (REE) in coal-derived fly ashes varies depending on the coal source and basins. Different coal types exhibit variations in REE concentration and distribution in fly ashes. The signature of REE in fly ashes can be indicative of their behavior in extraction processes, but the actual distribution may differ between fly ashes from different basins.
Article
Chemistry, Multidisciplinary
Xiangqian Liu, Chunhua Yan, Duanyang An, Chengen Yue, Tianlong Zhang, Hongsheng Tang, Hua Li
Summary: Rare earth ores require high technical requirements for their selection. This study establishes a rapid quantitative analysis method for rare earth elements Lu and Y in rare earth ores using LIBS combined with the iPLS-VIP and PLS calibration model. The results show that this method has good prediction performance for Lu and Y, providing a new method for in situ quantitative analysis of rare earth elements in rare earth ores.
Article
Metallurgy & Metallurgical Engineering
Y. Chen, D. He, J. H. Potgieter
Summary: This paper reviews and discusses the ore characteristics and conventional beneficiation techniques of four typical rare earth element deposits in China, and presents the latest laboratory findings, industrial applications, and development of novel reagents for rare earth element processing in China.
JOURNAL OF THE SOUTHERN AFRICAN INSTITUTE OF MINING AND METALLURGY
(2022)
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
Chemistry, Physical
A. Sheikhani, R. Roumina, R. Mahmudi
Summary: The study investigated the hot deformation behavior of an extruded Mg-3 wt% Al-1 wt% Zn (AZ31) alloy with and without rare-earth (RE) elements. It was found that the addition of RE elements enhanced the plasticity of the alloy and reduced the instability region according to the processing maps.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Environmental
Zeynep Cicek, Alejandro Agudelo Mira, Qingqing Huang
Summary: The study developed a separation approach to recover rare earth elements (REEs) from AMD treatment sludge. Parametric leaching tests were conducted to determine optimum leaching conditions. Stage-wise precipitation tests were applied to illustrate precipitation behaviors. Selective removal of impurities and enhancement of rare earth oxide purity were achieved through solvent extraction methodologies. The developed process produced a mixed rare earth product with a purity of 80% by weight.
RESOURCES CONSERVATION AND RECYCLING
(2023)
Article
Geochemistry & Geophysics
Amir Fayyaz, Raheel Ali, Muhammad Waqas, Usman Liaqat, Rizwan Ahmad, Zeshan A. Umar, Muhammed A. Baig
Summary: The present study aimed to analyze rare earth elements in geological ores from the Northern Areas of Pakistan using laser-induced breakdown spectroscopy (LIBS) and laser ablation time-of-flight mass spectrometry (LA-TOF-MS). The results showed that LIBS could provide quick and reliable qualitative and quantitative analysis of unknown geological samples.
Article
Spectroscopy
Susumu Imashuku
Summary: This study presents a method of using cathodoluminescence (CL) imaging to identify and estimate the rough content of bastnaesite in mineral ores. By analyzing CL images and spectra emitted by minerals, the author found that bastnaesite can be identified by detecting specific luminescence colors and areas in the images. This approach can greatly reduce the time required to explore mines with potential REE reserves.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Materials Science, Multidisciplinary
M. Mosayebi, A. Zarei-Hanzaki, M. Tahaghoghi, H. R. Abedi, A. Moshiri, A. Ghaderi
Summary: The present research investigates the texture and microstructure evolution of a magnesium composite reinforced with SiC particles and rare earth (RE) during friction stir processing. The study reveals that the mechanical stirring and frictional heat induce dynamic recrystallization and develop a strong basal texture component. The presence of second phase particles stimulates continuous dynamic recrystallization and particle stimulated nucleation while delaying discontinuous dynamic recrystallization. The formation of a new rare earth texture component is observed through simultaneous activity of basal and non-basal slip systems during dynamic recrystallization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Environmental Sciences
Catia Figueiredo, Miguel Caetano, Mario Mil-Homens, Ines Tojeira, Joana R. Xavier, Rui Rosa, Joana Raimundo
Summary: The study characterizes rare earth elements and trace elements in five genera of deep-sea sponges collected in the North Atlantic. These sponges showed an increased accumulation of trace elements compared to other organisms, possibly influenced by volcanic activity. Additionally, a Light REE enrichment and a negative Ce anomaly were observed in all studied species, providing a baseline for future comparisons.
MARINE POLLUTION BULLETIN
(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
Chemistry, Applied
Qiang He, Jiang Qiu, Jinfa Chen, Miaomiao Zan, Yanfei Xiao
Summary: This paper analyzes the impurity removal and green enrichment technologies for rare earth elements in the leaching process of rare earth ores, and proposes an efficient and environmentally friendly approach for the recovery of rare earth elements, addressing the issues of losses and pollution.
JOURNAL OF RARE EARTHS
(2022)