Ammonium uranyl carbonate (UO2CO3·2(NH4)2CO3) is known in the uranium processing industry as AUC and is also called uranyl ammonium carbonate. This compound is important as a component in the conversion process of uranium hexafluoride (UF6) to uranium dioxide (UO2). The ammonium uranyl carbonate is combined with steam and hydrogen at 500–600 °C to yield UO2. In another process aqueous uranyl nitrate, known as uranyl nitrate liquor (UNL) is treated with ammonium bicarbonate to form ammonium uranyl carbonate as a solid precipitate. This is separated from the solution, dried with methanol and then calcinated with hydrogen directly to UO2 to obtain a sinterable grade powder. The ex-AUC uranium dioxide powder is free-flowing, relatively coarse (10 µ) and porous with specific surface area in the
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| - Ammonium uranyl carbonate (en)
- Amonia uranila karbonato (eo)
- Carbonate mixte d'ammonium et d'uranyle (fr)
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| - Amonia uranila karbonato, karbonato de uranilo kaj amonio aŭ(UO2CO3 2 (NH4)2CO3) estas neorganika substanco, konata en la urania industria procezo kiel AUC, grava kombinaĵo kiel komponanto en la konverto-procezo de la urania heksafluorido (UF6) al urania duoksido (UO2). UF6 + 5 H2O + 10 NH3 + 4 CO2 → UO2CO3.2(NH4)2CO3 + 6 NH4F UO2CO3.2(NH4)2CO3 + H2 → UO2 + 3 CO2 + 4 NH3 + 3 H2O (eo)
- Ammonium uranyl carbonate (UO2CO3·2(NH4)2CO3) is known in the uranium processing industry as AUC and is also called uranyl ammonium carbonate. This compound is important as a component in the conversion process of uranium hexafluoride (UF6) to uranium dioxide (UO2). The ammonium uranyl carbonate is combined with steam and hydrogen at 500–600 °C to yield UO2. In another process aqueous uranyl nitrate, known as uranyl nitrate liquor (UNL) is treated with ammonium bicarbonate to form ammonium uranyl carbonate as a solid precipitate. This is separated from the solution, dried with methanol and then calcinated with hydrogen directly to UO2 to obtain a sinterable grade powder. The ex-AUC uranium dioxide powder is free-flowing, relatively coarse (10 µ) and porous with specific surface area in the (en)
- Le carbonate mixte d'ammonium et d'uranyle ou simplement carbonate d'ammonium et d'uranyle, généralement abrégé en AUC (pour ammonium uranyl carbonate en anglais), est un composé chimique de formule non fixée, le plus souvent écrite UO2CO3·2(NH4)2CO3 (tricarbonate d'uranyle tétra-ammonium), bien que les formules UO2·2(NH4)2CO3, U(NH4)2(CO3)4 et UO2NH4CO3 se rencontrent aussi fréquemment pour décrire le même composé. L'AUC peut entrer dans la composition du yellowcake. (fr)
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| - Ammonium uranyl carbonate (en)
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| - Ammonium uranyl carbonate (en)
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| - Uranyl-ammonium-carbonate-3D-vdW.png (en)
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| - uraniumdioxide tetra-ammonium tricarbonate (en)
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| - AUC (en)
- uranyl ammonium carbonate (en)
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| - Ammonium uranyl carbonate (UO2CO3·2(NH4)2CO3) is known in the uranium processing industry as AUC and is also called uranyl ammonium carbonate. This compound is important as a component in the conversion process of uranium hexafluoride (UF6) to uranium dioxide (UO2). The ammonium uranyl carbonate is combined with steam and hydrogen at 500–600 °C to yield UO2. In another process aqueous uranyl nitrate, known as uranyl nitrate liquor (UNL) is treated with ammonium bicarbonate to form ammonium uranyl carbonate as a solid precipitate. This is separated from the solution, dried with methanol and then calcinated with hydrogen directly to UO2 to obtain a sinterable grade powder. The ex-AUC uranium dioxide powder is free-flowing, relatively coarse (10 µ) and porous with specific surface area in the range of 5 m2/g and suitable for direct pelletisation, avoiding the granulation step. Conversion to UO2 is often performed as the first stage of nuclear fuel fabrication. The AUC process is followed in South Korea and Argentina. In the AUC route, calcination, reduction and stabilization are simultaneously carried out in a vertical fluidized bed reactor. In most countries, sinterable grade UO2 powder for nuclear fuel is obtained by the ammonium diuranate (ADU) process, which requires several more steps. Ammonium uranyl carbonate is also one of the many forms called yellowcake; in this case it is the product obtained by the heap leach process. (en)
- Amonia uranila karbonato, karbonato de uranilo kaj amonio aŭ(UO2CO3 2 (NH4)2CO3) estas neorganika substanco, konata en la urania industria procezo kiel AUC, grava kombinaĵo kiel komponanto en la konverto-procezo de la urania heksafluorido (UF6) al urania duoksido (UO2). UF6 + 5 H2O + 10 NH3 + 4 CO2 → UO2CO3.2(NH4)2CO3 + 6 NH4F UO2CO3.2(NH4)2CO3 + H2 → UO2 + 3 CO2 + 4 NH3 + 3 H2O (eo)
- Le carbonate mixte d'ammonium et d'uranyle ou simplement carbonate d'ammonium et d'uranyle, généralement abrégé en AUC (pour ammonium uranyl carbonate en anglais), est un composé chimique de formule non fixée, le plus souvent écrite UO2CO3·2(NH4)2CO3 (tricarbonate d'uranyle tétra-ammonium), bien que les formules UO2·2(NH4)2CO3, U(NH4)2(CO3)4 et UO2NH4CO3 se rencontrent aussi fréquemment pour décrire le même composé. Il s'agit d'un intermédiaire important de la synthèse du dioxyde d'uranium UO2 à partir de l'hexafluorure d'uranium UF6. Le dioxyde d'uranium est obtenu en traitant l'UAC avec de la vapeur d'eau et de l'hydrogène à 500-600 °C. Un autre procédé consiste à traiter une solution aqueuse de nitrate d'uranyle UO2(NO3)2 (appelée UNL, pour uranyl nitrate liquor en anglais) avec du bicarbonate d'ammonium NH4HCO3 pour former un précipité d'UAC qui est ensuite séparé de la solution, séché au méthanol CH3OH et calciné en présence d'hydrogène pour former directement du dioxyde d'uranium UO2. L'AUC peut entrer dans la composition du yellowcake. (fr)
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| alternative name
| - AUC (en)
- uranyl ammonium carbonate (en)
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| - uranium(VI)dioxide tetra-ammonium tricarbonate (en)
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