Abstract
A complex ammonium uranium fluoride was prepared by the reduction of uranium hexafluoride with ammonia in the gaseous phase at 40 deg. C. The very fine product was retained in electrical precipitators and converted into uranium dioxide by pyrohydrolysis with water vapour and hydrogen in the temperature interval between 500 and 600 deg. C. The reaction was followed by differential thermal and thermogravimetrical analysis. The uranium dioxide was analysed for fluorine and oxygen content and the crystal structure was checked by X-ray analysis. Several physico-chemical characteristics, such as specific surface area, particle size and tap density of the powder, have been determined. From the powder, the pellets have been pressed and sintered at 1350 deg. C. Depending on the various conditions of preparation, densities up to 94% of the theoretical values were achieved. (author) [French] Les auteurs ont prepare un fluorure complexe d'uranium et d'ammonium par reduction d'hexafluorure d'uranium avec du gaz ammoniac a 40 deg. C. Le produit obtenu, tres fin, a ete retenu dans des precipitateurs electriques et transforme en bioxyde d'uranium par hydrolyse a chaud avec de la vapeur d'eau et de l'hydrogene, a des temperatures se trouvant entre 500 et 600 deg. C. La reaction a
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Kolar, D.;
Slivnik, J.;
Volavsek, B.
[1]
- Jozef Stefan Nuclear Institute, Ljubljana, Yugoslavia (Slovenia)
Citation Formats
Kolar, D., Slivnik, J., and Volavsek, B.
On the Conversion of UF{sub 6} to UO{sub 2}; Conversion de UF{sub 6} en UO{sub 2}; O prevrashchenii UF{sub 6} v UO{sub 2}; Transformacion del UF{sub 6} en UO{sub 2}.
IAEA: N. p.,
1963.
Web.
Kolar, D., Slivnik, J., & Volavsek, B.
On the Conversion of UF{sub 6} to UO{sub 2}; Conversion de UF{sub 6} en UO{sub 2}; O prevrashchenii UF{sub 6} v UO{sub 2}; Transformacion del UF{sub 6} en UO{sub 2}.
IAEA.
Kolar, D., Slivnik, J., and Volavsek, B.
1963.
"On the Conversion of UF{sub 6} to UO{sub 2}; Conversion de UF{sub 6} en UO{sub 2}; O prevrashchenii UF{sub 6} v UO{sub 2}; Transformacion del UF{sub 6} en UO{sub 2}."
IAEA.
@misc{etde_22109651,
title = {On the Conversion of UF{sub 6} to UO{sub 2}; Conversion de UF{sub 6} en UO{sub 2}; O prevrashchenii UF{sub 6} v UO{sub 2}; Transformacion del UF{sub 6} en UO{sub 2}}
author = {Kolar, D., Slivnik, J., and Volavsek, B.}
abstractNote = {A complex ammonium uranium fluoride was prepared by the reduction of uranium hexafluoride with ammonia in the gaseous phase at 40 deg. C. The very fine product was retained in electrical precipitators and converted into uranium dioxide by pyrohydrolysis with water vapour and hydrogen in the temperature interval between 500 and 600 deg. C. The reaction was followed by differential thermal and thermogravimetrical analysis. The uranium dioxide was analysed for fluorine and oxygen content and the crystal structure was checked by X-ray analysis. Several physico-chemical characteristics, such as specific surface area, particle size and tap density of the powder, have been determined. From the powder, the pellets have been pressed and sintered at 1350 deg. C. Depending on the various conditions of preparation, densities up to 94% of the theoretical values were achieved. (author) [French] Les auteurs ont prepare un fluorure complexe d'uranium et d'ammonium par reduction d'hexafluorure d'uranium avec du gaz ammoniac a 40 deg. C. Le produit obtenu, tres fin, a ete retenu dans des precipitateurs electriques et transforme en bioxyde d'uranium par hydrolyse a chaud avec de la vapeur d'eau et de l'hydrogene, a des temperatures se trouvant entre 500 et 600 deg. C. La reaction a ete suivie d'une analyse thermique et thermogravimetrique differentielle. Les auteurs ont aussi analyse le bioxyde d'uranium pour determiner la teneur en oxygene et en fluor et ils ont verifie la structure des cristaux par une analyse aux rayons X. Ils ont determine plusieurs caracteristiques physico-chimiques de la poudre, telles que la surface specifique, la grosseur des particules et la densite apparente apres vibration. A partir de cette poudre, les pastilles ont ete frittees sous pression a 1350 deg. C. Les densites obtenues atteignaient 94% des valeurs theoriques, suivant les diverses conditions de preparation. (author) [Spanish] Los autores prepararon un fluoruro de uranio y amonio complejo por reduccion del hexafluoruro de uranio con amoniaco en fase gaseosa a 40 deg. C. Mediante una pirohidrolisis con vapor de agua e hidrogeno entre 500 y 600 deg. C, transformaron en dioxido de uranio el producto de grano muy fino retenido en precipitadores electricos. Por analisis termodiferencial y termogravimetrico observaron el desarrollo de la reaccion. Determinaron el fluor y el oxigeno contenidos en el dioxido de uranio y examinaron su estructura cristalina por analisis roentgenografico. Evaluaron diversas caracteristicas fisicoquimicas tales como el area superficial especifica, las dimensiones de las particulas y la densidad del polvo vibrado. A partir del polvo, prepararon pastillas prensadas y sinterizadas a 1350 deg. C. Obtuvieron densidades, variables segun las diversas condiciones de preparacion, que alcanzaron hasta el 94% del valor teorico. (author) [Russian] Vosstanovleniem geksaftorida urana ammiakom v gazovoj faze pri 40 deg. C byl poluchen kompleksnyj ammonij ftorid urana. Ehtot melkij poroshok uderzhivalsya v ehlektroosaditelyakh i perevodilsya v dvuokis' urana metodom pirogidrolieha vodyanymi parami i vodorodom pri temperature ot 500 do 600 deg. C. Khod reaktsii kontrolirovalsya metodom termicheskogo i termogravimetricheskogo analizov. V dvuokisi urana analiticheski opredelyalos' soderzhanie ftora i kisloroda, a kristallicheskaya struktura proveryalas' metodom rentgenovskogo analiza. Opredeleny nekotorye fiziko- khimicheskie' kharakteristiki , kak udel'naya poverkhnost', razmer chastits i konechnaya plotnost' poroshka. Iz poroshka pressovalis' tabletki, kotorye spekalis' pri 1350 deg. C. V zavisimosti ot razlichnykh uslovij izgotovleniya byli dostignuty plotnosti do 94% teoreticheskoj. (author)}
place = {IAEA}
year = {1963}
month = {Nov}
}
title = {On the Conversion of UF{sub 6} to UO{sub 2}; Conversion de UF{sub 6} en UO{sub 2}; O prevrashchenii UF{sub 6} v UO{sub 2}; Transformacion del UF{sub 6} en UO{sub 2}}
author = {Kolar, D., Slivnik, J., and Volavsek, B.}
abstractNote = {A complex ammonium uranium fluoride was prepared by the reduction of uranium hexafluoride with ammonia in the gaseous phase at 40 deg. C. The very fine product was retained in electrical precipitators and converted into uranium dioxide by pyrohydrolysis with water vapour and hydrogen in the temperature interval between 500 and 600 deg. C. The reaction was followed by differential thermal and thermogravimetrical analysis. The uranium dioxide was analysed for fluorine and oxygen content and the crystal structure was checked by X-ray analysis. Several physico-chemical characteristics, such as specific surface area, particle size and tap density of the powder, have been determined. From the powder, the pellets have been pressed and sintered at 1350 deg. C. Depending on the various conditions of preparation, densities up to 94% of the theoretical values were achieved. (author) [French] Les auteurs ont prepare un fluorure complexe d'uranium et d'ammonium par reduction d'hexafluorure d'uranium avec du gaz ammoniac a 40 deg. C. Le produit obtenu, tres fin, a ete retenu dans des precipitateurs electriques et transforme en bioxyde d'uranium par hydrolyse a chaud avec de la vapeur d'eau et de l'hydrogene, a des temperatures se trouvant entre 500 et 600 deg. C. La reaction a ete suivie d'une analyse thermique et thermogravimetrique differentielle. Les auteurs ont aussi analyse le bioxyde d'uranium pour determiner la teneur en oxygene et en fluor et ils ont verifie la structure des cristaux par une analyse aux rayons X. Ils ont determine plusieurs caracteristiques physico-chimiques de la poudre, telles que la surface specifique, la grosseur des particules et la densite apparente apres vibration. A partir de cette poudre, les pastilles ont ete frittees sous pression a 1350 deg. C. Les densites obtenues atteignaient 94% des valeurs theoriques, suivant les diverses conditions de preparation. (author) [Spanish] Los autores prepararon un fluoruro de uranio y amonio complejo por reduccion del hexafluoruro de uranio con amoniaco en fase gaseosa a 40 deg. C. Mediante una pirohidrolisis con vapor de agua e hidrogeno entre 500 y 600 deg. C, transformaron en dioxido de uranio el producto de grano muy fino retenido en precipitadores electricos. Por analisis termodiferencial y termogravimetrico observaron el desarrollo de la reaccion. Determinaron el fluor y el oxigeno contenidos en el dioxido de uranio y examinaron su estructura cristalina por analisis roentgenografico. Evaluaron diversas caracteristicas fisicoquimicas tales como el area superficial especifica, las dimensiones de las particulas y la densidad del polvo vibrado. A partir del polvo, prepararon pastillas prensadas y sinterizadas a 1350 deg. C. Obtuvieron densidades, variables segun las diversas condiciones de preparacion, que alcanzaron hasta el 94% del valor teorico. (author) [Russian] Vosstanovleniem geksaftorida urana ammiakom v gazovoj faze pri 40 deg. C byl poluchen kompleksnyj ammonij ftorid urana. Ehtot melkij poroshok uderzhivalsya v ehlektroosaditelyakh i perevodilsya v dvuokis' urana metodom pirogidrolieha vodyanymi parami i vodorodom pri temperature ot 500 do 600 deg. C. Khod reaktsii kontrolirovalsya metodom termicheskogo i termogravimetricheskogo analizov. V dvuokisi urana analiticheski opredelyalos' soderzhanie ftora i kisloroda, a kristallicheskaya struktura proveryalas' metodom rentgenovskogo analiza. Opredeleny nekotorye fiziko- khimicheskie' kharakteristiki , kak udel'naya poverkhnost', razmer chastits i konechnaya plotnost' poroshka. Iz poroshka pressovalis' tabletki, kotorye spekalis' pri 1350 deg. C. V zavisimosti ot razlichnykh uslovij izgotovleniya byli dostignuty plotnosti do 94% teoreticheskoj. (author)}
place = {IAEA}
year = {1963}
month = {Nov}
}