PRODUCTION OF UO2 POWDER FROM URANYL NITRATE SERIES

PURPOSE:To obtain UO2 powder capable of pelletizing as it is by adding aqueous ammonia into an uranyl nitrate soln. of prescribed concn. controlling the addition velocity. CONSTITUTION:The precipitate of ammonium biuranate is produced by adding aqueous ammonia of 20-35% concn. to an uranyl nitrate s...

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Bibliographische Detailangaben
Hauptverfasser:	HAMAGUCHI KAZUHIKO, HASEGAWA SHINICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OFSOLID INORGANIC COMPOUNDS INORGANIC CHEMISTRY METALLURGY NUCLEAR ENGINEERING NUCLEAR PHYSICS NUCLEAR REACTORS PHYSICS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain UO2 powder capable of pelletizing as it is by adding aqueous ammonia into an uranyl nitrate soln. of prescribed concn. controlling the addition velocity. CONSTITUTION:The precipitate of ammonium biuranate is produced by adding aqueous ammonia of 20-35% concn. to an uranyl nitrate soln. of 50-100g/l uranium concn. and 0-2.5N concn. of free nitric acid while controlling the addition velocity at 0.01-0.025gNH3/min per 1g uranium in the case of 3.5-4.5 pH of the uranyl nitrate soln. and at 0.1-0.5g/min per 1b uranium in the case of >=4.5 pH thereof and holding the mixture. Then after separating and drying this precipitate, it is calcined at 660-760 deg.C for 2-4hr in an air current of 0.3-0.3M /h.kgU flow rate and then reduced for 20-1hr in the reducing atmosphere of 2-5M /h.kgU flow rate of H2 to obtain UO2 powder.