scholarly journals Rare Earth Elements (La, Ce, Pr, Nd, and Sm) from a Carbonatite Deposit: Mineralogical Characterization and Geochemical Behavior

Minerals ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 55 ◽  
Author(s):  
Mohamed Edahbi ◽  
Benoît Plante ◽  
Mostafa Benzaazoua ◽  
Lori Kormos ◽  
Mia Pelletier
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Mineralogical Characterization ◽  
Geochemical Behavior

scholarly journals Extraction of Rare Earth Elements from Phospho-Gypsum: Concentrate Digestion, Leaching, and Purification

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 131 ◽  
Author(s):  
Lisa Brückner ◽  
Tobias Elwert ◽  
Thomas Schirmer
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Raw Materials ◽  
Leach Solution ◽  
Ammonium Bicarbonate ◽  
Production Plant ◽  
Mineralogical Characterization ◽  
Process Route ◽  
Cooperative Project ◽  
The Rare Earth

Rare earth-bearing gypsum tailings from the fertilizer industry are a potential source for an economically viable and sustainable production of rare earth elements. Large quantities are generated inter alia in Catalão, Brazil, as a by-product in a fertilizer production plant. Hitherto, the gypsum has been used as soil conditioner in agriculture or was dumped. The cooperative project, “Catalão Monazite: Economical exploitation of rare earth elements from monazite-bearing secondary raw materials,” intends to extract rare earth elements from these gypsum tailings. In this paper, a chemical process route to obtain a mixed rare earth carbonate from a monazite concentrate, was investigated. The results of the digestion, leaching, and precipitation experiments are presented and discussed herein. This includes reagent choice, process parameter optimization through experimental design, mineralogical characterization of the feed material and residues, purification of the leach solution, and precipitation of the rare earth as carbonates. The results showed that a rare earth extraction of about 90% without the mobilization of key impurities is possible during a sulfuric acid digestion with two heating stages and subsequent leaching with water. In the following purification step, the remaining impurities were precipitated with ammonium solution and the rare earth elements were successfully recovered as carbonates with a mixture of ammonium solution and ammonium bicarbonate.

Geochemical behavior of rare earth elements during the evolution of CO2-rich groundwater: A study from the Kangwon district, South Korea

2009 ◽  
Vol 262 (3-4) ◽  
pp. 318-327 ◽  
Author(s):  
Hyeon-Su Choi ◽  
Seong-Taek Yun ◽  
Yong-Kwon Koh ◽  
Bernhard Mayer ◽  
Seong-Sook Park ◽  
...  
Keyword(s):  
Rare Earth ◽  
South Korea ◽  
Rare Earth Elements ◽  
Geochemical Behavior

Geochemical behavior of rare earth elements in acid drainages: Modeling achievements and limitations

2020 ◽  
Vol 216 ◽  
pp. 106577 ◽  
Author(s):  
Alba Lozano ◽  
Carlos Ayora ◽  
Francisco Macías ◽  
Rafael León ◽  
María José Gimeno ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Geochemical Behavior

Long-lived Radioactive Elements and REE as Fingerprints of Deep Groundwater Flow

2021 ◽  
Author(s):  
Marina Ćuk Đurović ◽  
Maja Todorović ◽  
Igor Jemcov ◽  
Petar Papić
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Groundwater Flow ◽  
Natural Radioactivity ◽  
Thermal Waters ◽  
Geochemical Behavior ◽  
Deep Circulation ◽  
Regional Groundwater ◽  
Hydrogeological Systems

<p>Groundwater originating from great depths provide a valuable geochemical sampling medium for exploring the development of the Earth's crust, geological, and hydrogeological resources. This particularly applies to sites of natural springs, where favorable hydrogeological conditions enabled regional discharge. Despite the numerous occurrences of mineral and thermal waters in Serbia, the current understanding of the regional groundwater flow is associated with many open questions that need to be addressed. From a geological standpoint, Serbia is part of the Alpine-Mediterranean mountain belt. From the middle of the Mesozoic to the present, this area underwent processes of subduction, collision, and extensions with accompanying voluminous magmatism and volcanism. As a result of the mentioned geodynamic events, the Serbian territory was a zone of intensive tectonomagmatic processes which had a significant impact on the formation of the hydrogeological structures for forming groundwater enriched with specific elements and elevated temperatures.</p><p>Understanding groundwater origin and characterization of a deep circulation is a big challenge since the groundwater pathways and aqueous chemistry are significantly influenced by various factors. To contribute to the characterization of the hydrogeological systems in which the mineral and thermal waters of Serbia are formed, a general hydrochemical study was conducted. During this research 190 of the most significant sources of mineral and thermal waters were sampled, belonging to different geological (geotectonic) units all over Serbia. The applied hydrochemical approach of recognition of deep circulation patterns is based on an analysis of rare earth elements (REE) and natural radioactivity. REE and long-lived radionuclides <sup>40</sup>K, <sup>238</sup>U, <sup>232</sup>Th, <sup>226,228</sup>Ra, gross alpha, and beta radioactivity, have proven to be significant fingerprints of water-rock interaction as well as groundwater flow tracers.</p><p>The integrated approach of the hydrogeochemical analysis and multivariate statistical method, including spatial mapping of obtained results, was an important process for meaningful interpretation of the data set. The applied approach summarized the complex hydrochemical properties on a general level defining specific hydrochemical fingerprints of hydrogeological systems with distinct geochemical characteristics and flow patterns. Geochemical behavior of natural tracers (REE) and radioactivity contributed to further characterization of deep hydrogeological systems in basins structures, hard rocks (igneous and metamorphic rocks), as well as carbonate environments.</p><p>Rare-earth element data (including abundances and fractionation patterns along with anomalies of Ce and Eu and interelement ratios), relationships of U and Th as elements with different geochemical behavior, and the content of Ra in groundwaters have been singled out as important indicators of deep hydrogeological systems. The results showed that the isolated regional hydrogeological systems are in the function of significant tectonic structures/dislocations, but also hydrogeological characteristics and circulation conditions. Further use of the proposed methodology will provide important data from the assessment of the origin of hydro-geofluids in Serbia and contribute to the wider picture in the understanding of the hydrogeological evolution of regional groundwater flow.</p><p><strong>Keywords:</strong> natural radioactivity, rare earth elements, hydrogeochemical fingerprints, regional groundwater flow</p>

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