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Sodium diuranate, also known as the yellow oxide of uranium, is an inorganic chemical compound with the chemical formula . It is a sodium salt of a diuranate anion. It forms a hexahydrate . Sodium diuranate is commonly referred to by the initials SDU.Meredith, A. D. (2013). Modified Sodium Diuranate Process for the Recovery of Uranium from Uranium Hexafluoride Transport Cylinder Wash Solution. (Doctoral dissertation). Retrieved from http://scholarcommons.sc.edu/etd/2466 Along with ammonium diuranate it was a component in early . The ratio of the two compounds is determined by process conditions; however, yellowcake is now largely a mix of .
These older methods of extracting uranium from its uraninite has been replaced in current practice by such procedures as solvent extraction, ion exchange, and volatility methods.Gindler, J. E. (1962). The Radiochemistry of Uranium p. 39–235
Sodium uranate may be obtained in the amorphous form by heating together urano-uranic oxide and sodium chlorate; or by heating sodium uranyl acetate or Uranyl carbonate. The crystalline form is produced by adding the green oxide in small quantities to fused sodium chloride, or by dissolving the amorphous form in fused sodium chloride, and allowing crystallization to take place. It yields reddish-yellow to greenish-yellow prisms or leaflets.
It was also used in porcelain dentures to give them a fluorescence similar to that of natural teeth and once used in pottery to produce ivory to yellow shades in ceramic glaze. It was added to these products as a mix with cerium oxide. The final uranium composition was from 0.008 to 0.1% by weight uranium with an average of about 0.02%. The practice appears to have stopped in the late 1980s.
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