Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Chemical compound
Ammonium uranyl carbonate (UO2CO3·2(NH4)2CO3) is known in the uranium processing industry as AUC[2] 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).[3] 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.[4] 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.[5]
The AUC process is followed in South Korea[6] and Argentina.[7] 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.
^ abcGraziani, R.; Bombieri, G.; Forsellini, E. (1972). "Crystal structure of tetra-ammonium uranyl tricarbonate". Journal of the Chemical Society, Dalton Transactions (19): 2059. doi:10.1039/DT9720002059.
^Mellah, A.; Chegrouche, S.; Barkat, M. (2007-03-01). "The precipitation of ammonium uranyl carbonate (AUC): Thermodynamic and kinetic investigations". Hydrometallurgy. 85 (2–4): 163–171. Bibcode:2007HydMe..85..163M. doi:10.1016/j.hydromet.2006.08.011. ISSN 0304-386X.
^Krishnan, V. N.; Visweswaraih, M. S.; Shringarpure, P. D.; Koppiker, K. S.; Date, V. G. "Studies on the preparation and characterisation of ammonium uranyl carbonate (AUC)". {{cite journal}}: Cite journal requires |journal= (help)
^Johnson, Timothy J.; Sweet, Lucas E.; Meier, David E.; Mausolf, Edward J.; Kim, Eunja; Weck, Philippe F.; Buck, Edgar C.; McNamara, Bruce K. (2015-05-22). Fountain, Augustus W (ed.). "Dehydration of uranyl nitrate hexahydrate to uranyl nitrate trihydrate under ambient conditions as observed via dynamic infrared reflectance spectroscopy". Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI. 9455: 945504. doi:10.1117/12.2179704. S2CID 121901323.
^Glazoff, Michael; J. van Rooen, Isabella; D. Coryell, Benjamin; J. Parga, Clemente (2016-05-05). Comparison of Nuclear Fuels for TREAT: UO2 vs. U3O8.
^Dominguez, C. A.; Leyva, A. G.; Marajofsky, A. "Conditions study of ammonium uranyl tricarbonate precipitation through ammonium carbonate" (in Spanish). {{cite journal}}: Cite journal requires |journal= (help)
and 18 Related for: Ammonium uranyl carbonate information
Ammoniumuranylcarbonate (UO2CO3·2(NH4)2CO3) is known in the uranium processing industry as AUC and is also called uranylammoniumcarbonate. This compound...
executive/administrative branch or secretariat of the supranational organisation Ammoniumuranylcarbonate, a chemical compound used in uranium processing Appropriate use...
Other examples include potassium sodium tartrate, ammonium iron(II) sulfate (Mohr's salt), potassium uranyl sulfate (used to discover radioactivity) and bromlite...
devitrification of glass materials; removal of ammonium ions in the synthesis of zeolites; defluorination of uranyl fluoride to create uranium dioxide and hydrofluoric...
the individual metal centre with a polyatomic complex, as shown by the uranyl ion example. If an ion contains unpaired electrons, it is called a radical...
remains in the form of uranyl nitrate (UO2(NO3)2). The solution is treated with a reducing agent and neutralized with ammoniumcarbonate to pH = 8 that results...
sulfuric and nitric acids. The uranium dissolves to form uranyl sulfate and sodium carbonate is added to precipitate impurities. If the uranium in the...
are expected to differ, even though they are both polymorphs of calcium carbonate and have the same chemical formula.[clarification needed] The solubility...
compounds containing caesium, oxalate and another anion also exist, such as the uranyl sulfate above, and caesium bis(oxalato)borate (CsBOB) (Cs[B(C2O4)2]). Atherton...
wine-red and warm gray. Neodymium(III) acetate can be used as a substitute for uranyl acetate, which is used in electron microscopy. Burke M.W. (1996) Lighting...
ion exchange in ammoniumcarbonate has been reported. Other methods for the extraction of uranium using ion exchange in alkaline carbonate and "fumed" lead...
The volume of the ions is 47.8 cm3/mol. Most metal ions, and quaternary ammonium ions, can form fluorosulfate salts. Different ways to make these salts...