Resolving the structural state of heavy rare earth elements in lateritic ion adsorption clays
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F19%3A43917211" target="_blank" >RIV/62156489:43410/19:43917211 - isvavai.cz</a>
Result on the web
<a href="https://www.sga2019glasgow.com/abstract" target="_blank" >https://www.sga2019glasgow.com/abstract</a>
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Resolving the structural state of heavy rare earth elements in lateritic ion adsorption clays
Original language description
Lateritic Ion Adsorption Deposits (IADs) are the world's dominant source for heavy rare earth elements (HREE: Gd-Lu), currently mostly mined from China. IADs in Brazil, Madagascar and South East Asia may provide alternative supply for HREE. However, the exact nature of REE in the IADs is unclear; for example whether deposits elsewhere are directly analogous to the easily-leachable Chinese laterites, and whether the REE are truly adsorbed, structurally bound in clays or hosted in other mineral phases. This study compares economically mineralized IADs from the Zhaibei granite, China to prospective IADs developed on peralkaline igneous rocks from Madagascar. We use synchrotron X-Ray Fluorescence (SXRF) element mapping and X-ray Absorption Spectroscopy (XAS) to study the distribution and coordination state of light and heavy REE. We explore sites of adsorption to clays and the presence of HREE in other mineral phases. The Malagasy and Chinese laterites have kaolinite as the dominant REE-hosting clay phase, with minor halloysite. XAS data demonstrate that the REE occur as 8 to 9-coordinated outer-sphere basal surface complexes on kaolinite, rather than 5- or 6-coordinated edge complexes, or 6- or 8-coordinated interlayer complexes, thus confirming the truly adsorbed nature of REE in lateritic IAD's from both localities.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Proceedings of the 15th SGA Biennial Meeting on Life with Ore Deposits on Earth. Volume 4
ISBN
978-0-85261-965-0
ISSN
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e-ISSN
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Number of pages
4
Pages from-to
1748-1751
Publisher name
University of Glasgow
Place of publication
Glasgow
Event location
Glasgow
Event date
Aug 27, 2019
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000503111600457