SEPARATION OF SCANDIUM AND THORIUM FROM RARE EARTH MINERALS

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

SEPARATION OF SCANDIUM AND THORIUM FROM RARE EARTH MINERALS

Popis výsledku v původním jazyce

In addition to a significant amount of thorium, uranium ores and the phosphorus mineral monazite also contain industrially usable amounts of rare earth elements - lanthanides, including scandium and yttrium. Similar variations have been identified following the recent announcement of the discovery of new lanthanide deposits in the Kiruna region of Sweden. The processing of such raw materials for the extraction of rare earth elements and scandium primarily requires the removal or isolation of radioactive thorium. This can be achieved by carbide of the raw material followed by the conversion of hydrolyzable carbides into soluble compounds, suitable for ion exchange separation. The possibility of thorium carbide formation by reaction with carbon at a temperature of 2200 degrees C using Spark plasma sintering was verified on a raw material from the Czech uranium deposit Jachymov. The temperature was sufficient only for the formation of Sc2OC and Sc4C3 carbides. The reaction of thorium dioxide present in the raw material to carbide occurred only when heated above 2500 degrees C in an Acheson-type microfurnace. After hydrolysis with the release of allylene, scandium was transferred to a solution whose radioactivity did not exceed the values for further safe processing permitted by the Office for Nuclear Safety SUJB.

Název v anglickém jazyce

SEPARATION OF SCANDIUM AND THORIUM FROM RARE EARTH MINERALS

Popis výsledku anglicky

In addition to a significant amount of thorium, uranium ores and the phosphorus mineral monazite also contain industrially usable amounts of rare earth elements - lanthanides, including scandium and yttrium. Similar variations have been identified following the recent announcement of the discovery of new lanthanide deposits in the Kiruna region of Sweden. The processing of such raw materials for the extraction of rare earth elements and scandium primarily requires the removal or isolation of radioactive thorium. This can be achieved by carbide of the raw material followed by the conversion of hydrolyzable carbides into soluble compounds, suitable for ion exchange separation. The possibility of thorium carbide formation by reaction with carbon at a temperature of 2200 degrees C using Spark plasma sintering was verified on a raw material from the Czech uranium deposit Jachymov. The temperature was sufficient only for the formation of Sc2OC and Sc4C3 carbides. The reaction of thorium dioxide present in the raw material to carbide occurred only when heated above 2500 degrees C in an Acheson-type microfurnace. After hydrolysis with the release of allylene, scandium was transferred to a solution whose radioactivity did not exceed the values for further safe processing permitted by the Office for Nuclear Safety SUJB.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 11th International Conference on Chemical Technology

ISBN

978-80-88307-21-1

ISSN

2336-811X

e-ISSN

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Počet stran výsledku

5

Strana od-do

148-152

Název nakladatele

Česká společnost chemická

Místo vydání

Praha

Místo konání akce

Mikulov

Datum konání akce

15. 4. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001678797800025