Experimental study of graphite reactivity in sulfuric acid solutions with or without uranium: spectroscopic characterization of graphite intercalation compounds
Description
This work is devoted to the study of the reactivity of graphite in sulfuric solutions with or without uranyl ions between 20 and 300 deg. C. Its aim is to explain the alteration phenomena observed on natural graphite close to uranium deposits and to determine the possible role of graphite in the precipitation of this mineral. With sulfuric acid, the first spontaneous synthesis of insertion compounds is carried out chemically without the addition of oxidants. The introduction of uranyl ions into the sulfuric solution not only facilitates the insertion of the sulphates thanks to their oxidizing nature, but also leads to the formation of a new phase in which the uranyl ions are associated with the sulphates. The structure of the uranyl-sulfate phase was studied by X-ray diffraction. The compounds obtained were characterized by Raman and infrared spectroscopies. The inserted species were also highlighted. Finally, a pressure study is carried out to determine the classic redox reactions between graphite and dilute sulfuric solutions
Abstract (French)
Ce travail est consacre a l'etude de la reactivite du graphite dans les solutions sulfuriques avec ou sans ions uranyles entre 20 et 300 deg. C. Il avait pour but d'expliquer les phenomenes d'alteration observes sur le graphite naturel proche de gisements d'uranium et de determiner l'eventuel role du graphite dans la precipitation de ce minerai. Avec l'acide sulfurique, la premiere synthese spontanee de composes d'insertion a ete realisee par voie chimique sans adjonction d'oxydants. L'introduction d'ions uranyles dans la solution sulfurique facilite non seulement l'insertion des sulfates grace a leur caractere oxydant, mais aussi entraine la formation d'une nouvelle phase dans laquelle les ions uranyles sont associes aux sulfates. La structure de la phase uranyle-sulfate a ete etudiee par diffraction des rayons X. Les composes obtenus ont ete caracterises par les spectroscopies Raman et infrarouge. Les especes inserees ont ete egalement mises en evidence. Enfin, une etude sous pression a ete realisee pour determiner les reactions redox classiques entre graphite et solutions sulfuriques diluees. (auteur)Files
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Additional details
Additional titles
- Original title (French)
- Reactivite du graphite avec les solutions sulfatees acides en presence ou non d'uranium: caracterisation spectroscopique des composes d'insertion
Publishing Information
- Imprint Pagination
- 259 p.
- Report number
- FRNC-TH--11397
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 52011305
- Subject category
- S11: NUCLEAR FUEL CYCLE AND FUEL MATERIALS; S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; S58: GEOSCIENCES;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- CHEMICAL REACTION KINETICS; CHEMICAL REACTIONS; CLATHRATES; GEOCHEMISTRY; GRAPHITE; INFRARED SPECTROMETERS; OXIDATION; PRECIPITATION; RAMAN SPECTROSCOPY; REACTIVITY; REDOX REACTIONS; SULFATES; SULFURIC ACID; URANIUM; URANIUM DEPOSITS; URANYL COMPOUNDS; X-RAY DIFFRACTION
- Descriptors DEC
- ACTINIDE COMPOUNDS; ACTINIDES; CARBON; CHEMICAL REACTIONS; CHEMISTRY; COHERENT SCATTERING; DIFFRACTION; ELEMENTS; GEOLOGIC DEPOSITS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; INORGANIC COMPOUNDS; KINETICS; LASER SPECTROSCOPY; MEASURING INSTRUMENTS; METALS; MINERAL RESOURCES; MINERALS; NONMETALS; OXYGEN COMPOUNDS; REACTION KINETICS; RESOURCES; SCATTERING; SEPARATION PROCESSES; SPECTROMETERS; SPECTROSCOPY; SULFUR COMPOUNDS; URANIUM COMPOUNDS
Optional Information
- Notes
- 92 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses