Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Nverify (what is YN ?)
Infobox references
Chemical compound
Ammonium diuranate or (ADU) ((NH4)2U2O7), is one of the intermediate chemical forms of uranium produced during yellowcake production. The name "yellowcake" originally given to this bright yellow salt, now applies to mixtures of uranium oxides which are actually hardly ever yellow. It also is an intermediate in mixed-oxide (MOX) fuel fabrication. Although it is usually called "ammonium diuranate" as though it has a "diuranate" ion U 2O2− 7, this is not necessarily the case. It can also be called diammonium diuranium heptaoxide. The structure is said to be similar to that of uranium dioxide dihydrate.[1][2]
It is precipitated by adding aqueous ammonium hydroxide after uranium extraction by tertiary amines in kerosene. This precipitate is then thickened and centrifuged before being calcined to uranium oxide. Canadian practice favours the production of uranium oxide from ammonium diuranate, rather than from uranyl nitrate as is the case elsewhere.[citation needed]
Ammonium diuranate was once used to produce colored glazes in ceramics.[3] However when being fired this will decompose to uranium oxide, so the uranate was only used as a lower cost material than the fully purified uranium oxide.
^C. N. Turcanu & R. Deju (May 10, 2017). "Thermal Analysis of Ammonium Diuranate". Nuclear Technology. 45 (2): 188–192. doi:10.13182/NT79-A32310. All types of ADU when analyzed by x-ray diffraction have a structure similar to UO3-2H2O
^C. N. Turcanu; et al. (Apr 1976). "Analiza termica a diuranatului de amoniu" (PDF). Analiza cu raze X arată pentru ADU o structură cristalină apropiată de UO3·2H2O{{cite journal}}: Cite journal requires |journal= (help), citing J. B. Ainscough, B. W. Oldfield (Sep 1962). "Effect of ammonium diuranate precipitation conditions on the characteristics and sintering behaviour of uranium dioxide". Journal of Applied Chemistry. 12 (9): 418–424. doi:10.1002/jctb.5010120907. and E.H.P.Cordfunke (Mar 1962). "On the uranates of ammonium—I: The ternary system NH3-UO3-H2O". Journal of Inorganic and Nuclear Chemistry. 24. doi:10.1016/0022-1902(62)80184-5.
^Safford, Hurd W.; Kuebel, A. (1943-02-01). "Preparations and properties of ammonium diuranate". Journal of Chemical Education. 20 (2): 88. Bibcode:1943JChEd..20...88S. doi:10.1021/ed020p88. ISSN 0021-9584.
and 18 Related for: Ammonium diuranate information
Ammoniumdiuranate or (ADU) ((NH4)2U2O7), is one of the intermediate chemical forms of uranium produced during yellowcake production. The name "yellowcake"...
oxides are the foundation of the nuclear fuel cycle ("ammoniumdiuranate" and "sodium diuranate" are intermediates in the production of uranium oxide...
a diuranate anion. It forms a hexahydrate Na2U2O7·6H2O. Sodium diuranate is commonly referred to by the initials SDU. Along with ammoniumdiuranate it...
precipitate formed in the milling process and considered it to be ammoniumdiuranate or sodium diuranate. The compositions were variable and depended upon the leachant...
be used in new MOX fuel rods. Ammoniumdiuranate or sodium diuranate (Na2U2O7·6H2O) may be decomposed. Sodium diuranate, also known as yellowcake, is...
converted by treatment with a base such as ammonia to form a mixture of ammoniumdiuranate and plutonium hydroxide. After heating in a mixture of 5% hydrogen...
obtained by solvent extraction, then treated with ammonia to produce ammoniumdiuranate ("ADU", [NH4]2U2O7). Reduction with hydrogen gives UO2, which is converted...
dwelling unit or secondary suite Adu (surname) Adú, 2020 Spanish film Ammoniumdiuranate Analog-to-digital converter or Analog-to-digital unit Application...
uranium hexafluoride by reacting with ammonia to form a solid called ammoniumdiuranate, (NH4)2U2O7. This is then heated (calcined) to form UO 3 and U3O8...
for nuclear fuel is obtained by the ammoniumdiuranate (ADU) process, which requires several more steps. Ammonium uranyl carbonate is also one of the...
and precipitated by the addition of ammonia, producing ammoniumdiuranate. The ammoniumdiuranate was heated in a furnace and reduced with hydrogen and...
using kerosene with amine then stripped with ammonium sulphate solution and gaseous ammonia. Ammoniumdiuranate is precipitated by increasing the pregnant...
hour was available. The UO2F2-HF solution can then be neutralized to ammoniumdiuranate, filtered, washed, and dried to UO2 using components of the system...
uranyl chloride solution is subsequently refined to nuclear grade ammoniumdiuranate by a purification process involving precipitation and solvent extraction...
started production in 1853 of uranium pigments (sodium, potassium and ammoniumdiuranates, uranium oxides) for the production of uranium glass from high-grade...
earlier. Klaproth was able to precipitate a yellow compound (likely sodium diuranate) by dissolving pitchblende in nitric acid and neutralizing the solution...
includes thorium and the rare earths as their hydroxides, uranium as sodium diuranate, and phosphate as trisodium phosphate. This crystallises trisodium phosphate...
Global Information
verify (what is 
?)
