Rare-earth elements as tracers of the genetic relationship between smectite and palygorskite in marine phosphorites

Clay Minerals ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 419-427 ◽  
Author(s):  
A. Chahi ◽  
N. Clauer ◽  
T. Toulkeridis ◽  
M. Bouabdelli
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Genetic Relationship ◽  
Acid Treatment ◽  
Crystallization Process ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Distribution Patterns ◽  
Dilute Acid ◽  
Before And After

AbstractDetrital smectite in a sandy claystone and a phosphorite, and authigenic palygorskite in a dolomitic marl and a porcellanite from Cretaceous-Tertiary phosphorite deposits of the Ganntour Basin (Morocco) were purified using cation exchange resin, leached with dilute acid, and analysed for the contents and distribution patterns of their REE before and after acid treatment. The normalized patterns confirm a detrital origin for the smectite in the sandy claystone, whereas the origin of the smectite from the phosphorite is obscured by the addition of REE from the phosphogenic environment. The normalized REE patterns of the palygorskite suggest formation in non-oxidizing restricted environments. The Al2O3/ΣREE ratio of the two clay types suggests formation of diagenetic palygorskite (and mixed-layer illite-smectite) from Al-bearing detrital smectite by a dissolution-crystallization process.

Sorption extraction of rare-earth elements on sulfonic cation-exchange resin KU-2-8 from nitrate solutions of loparite concentrate development

2021 ◽  
Vol 22 (7) ◽  
pp. 312-317
Author(s):  
Dmytro Yelatontsev ◽  
◽  
Anatoly Mukhachev ◽  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Raw Materials ◽  
Cation Exchange Resin ◽  
Sodium Content ◽  
Study Results ◽  
Loparite Concentrate ◽  
Nitrate Solutions

The experimental-industrial study results of the process of sorption of rare-earth elements on sulfonic cation-exchange resin KU-2-8 from nitrate solutions of loparite concentrate development are presented. Values of different obtained elements are discussed. Different changes in processes are described. Reprocessing loparine raw materials in the close cycle without hydrochloric and sulfuric acid, and excess of normative sodium content in productional concentrate is possible. Keywords: ionite, sorption, loparite concentrate, rare-earth element, thorium.

scholarly journals Adsorption of rare earth elements by strong acid cation exchange resin thermodynamics, characteristics and kinetics

2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Yasser M. Khawassek ◽  
Ahmed A. Eliwa ◽  
El Sayed A. Haggag ◽  
Sayed A. Omar ◽  
Saad M. Abdel-Wahab
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Strong Acid ◽  
Acid Cation

scholarly journals Concentration of Rare Earth Elements (Sc, Y, La, Ce, Nd, Sm) in Bauxite Residue (Red Mud) Obtained by Water and Alkali Leaching of Bauxite Sintering Dust

Minerals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 500 ◽  
Author(s):  
Leonid Chaikin ◽  
Andrei Shoppert ◽  
Dmitry Valeev ◽  
Irina Loginova ◽  
Julia Napol’skikh
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Red Mud ◽  
Electrostatic Precipitator ◽  
Bauxite Residue ◽  
X Ray ◽  
Before And After ◽  
Shrinking Core ◽  
Alkali Leaching ◽  
Rotary Kilns

One of the potential sources of rare-earth elements (REE) is the industrial waste known as red mud (bauxite residue), in which the majority of REE from the initial bauxite are concentrated via the Bayer process. Therefore, the studies of the subject, both in Russia and outside, focus almost exclusively on red mud processing. This article looks into the possibility of REE concentration into red mud by leaching an intermediate product of the bauxite sintering process at Russian alumina refineries, namely electrostatic precipitator (ESP) dust. The experimental works were performed by X-ray diffraction (XRD)and electron probe microanalysis (EPMA) of the sinter and sinter dust. The determination of major and rare-earth elements in the sinter from the rotary kilns and in the ESP dust before and after leaching was carried out by X-ray fluorescence (XRF) and plasma mass spectrometry (ICP-MS). The study showed that it is possible to obtain red mud that contains three times more REE than traditional waste red mud after two-stage leaching ESP dust in the water at 95 °C followed by leaching in an alkaline-aluminate liquor at 240 °C. The shrinking core model was used to study the kinetics of leaching of the original ESP dust and water-treated dust in alkaline-aluminate liquor. The study showed the change in the limiting stage of the alkaline leaching process after water treatment, with the activation energy growing from 24.98 to 33.19 kJ/mol.

Residence and fractionation of rare earth elements during kaolinization of alkaline peraluminous granites in NW Spain

Clay Minerals ◽  
2007 ◽  
Vol 42 (3) ◽  
pp. 341-352 ◽  
Author(s):  
E. Galán ◽  
J. C. Fernández-Caliani ◽  
A. Miras ◽  
P. Aparicio ◽  
M. G. Márquez
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Dominant Role ◽  
Clay Mineralogy ◽  
Distribution Patterns ◽  
Weathering Profile ◽  
Nw Spain ◽  
Peraluminous Granites ◽  
Mineralogical Study ◽  
Different Grain Size

AbstractA geochemical and mineralogical study has allowed us to address the factors controlling distribution pattern, residence and behaviour of rare earth elements (REE) during kaolinization of Variscan granitoids in NW Spain. Mineral composition of the deeply weathered samples is dominated by kaolinite, with minor amounts of quartz, muscovite-illite, alkaline feldspar and traces of resistant minerals (rutile, ilmenite, zircon and monazite). Variable amounts of Si, Na, Ca, K, Rb, Cs, Ba, U and P were lost from the weathering profile, as a result of feldspars, mica and apatite breakdown, whereas Al, Fe, Ti, Zr, Th, Hf and REE were concentrated in the residual kaolin. Chondrite-normalized REE patterns of the kaolins show an overall enrichment of light REE (LaN/SmN = 1.22–2.53), heavy REE depletion (GdN/YbN = 2.42–15.10) and a strong negative Eu anomaly (Eu/Eu* = 0.11–0.25), probably inherited from the parent granite. Nevertheless, the normalization to the parent granite reveals some REE fractionation and increasing positive Eu anomalies with advancing weathering, in response to the breakdown of feldspars. Different grain-size fractions show similar REE distribution patterns, but differ in concentration levels. Although the fine fractions are the most important REE reservoir, there is no positive correlation with clay mineralogy. The correlative behaviour among P2O5, Th and REE in the <2 mm fraction suggests that monazite plays a dominant role controlling the REE budget in the weathering profile.

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