Pilot plant development of processes for the production of ammonium diuranate

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dc.contributor.authorJanov, Jen_AU
dc.contributor.authorAlfredson, PGen_AU
dc.contributor.authorVilkaitis, VKen_AU
dc.date.accessioned2007-11-22T04:24:20Zen_AU
dc.date.accessioned2010-04-30T04:36:12Zen_AU
dc.date.available2007-11-22T04:24:20Zen_AU
dc.date.available2010-04-30T04:36:12Zen_AU
dc.date.issued1975-01en_AU
dc.description.abstractNuclear grade ammonium diuranate (ADU) and UO powders were produced on a pilot plant scale by the continuous single-stage precipitation of ADU with ammonium hydroxide, dewatering with a rotary drum vacuum filter or a solid bowl centrifuge, and batch-tray drying and calcination-reduction to UO powder. Precipitation at 50ºC and pH values in the range 7.2 to 8.0 produced ADU materials which could be converted to UO powder by calcination and reduction at temperatures of 600 to 730ºC, and fabricated into sintered pellets with densities of 10.37 to 10.77 g cm-3. The lower the pH of precipitation the lower was the reduction temperature required to achieve a specified pellet density. Precipitation with ammonium hydroxide at 80ºC and with ammonia gas at 50ºC offered no advantages over precipitation with ammonium hydroxide at 50ºC. The UO2 powders and sintered pellets produced from ADU powders precipitated by the three methods were similar. Precipitation at pH 7.5 and 50ºC is recommended since a reasonably filterable precipitate can be produced reproducibly without a need for stringent control, and considerable flexibility is available in the subsequent production of a sinterable UO2 powder. Dewatering of ADU slurries was carried out more efficiently using a solid bowl centrifuge rather than a rotary drum vacuum filter. Clearer discharge liquids were produced at a higher rate of throughput in the solid bowl centrifuge.en_AU
dc.identifier.citationJanov, J., Alfredson, P., & Vilkaitis, V. (1975). Pilot plant development of processes for the production of ammonium diuranate (AAEC/E333). Lucas Heights, N.S.W.: Australian Atomic Energy Commission, Research Establishment.en_AU
dc.identifier.govdoc548en_AU
dc.identifier.isbn0642996695en_AU
dc.identifier.otherAAEC-E-333en_AU
dc.identifier.placeofpublicationLucas Heights, New South Walesen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/538en_AU
dc.language.isoen_auen_AU
dc.publisherAustralian Atomic Energy Commissionen_AU
dc.subjectCalcinationen_AU
dc.subjectPrecipitationen_AU
dc.subjectSlurriesen_AU
dc.subjectAmmonium hydroxidesen_AU
dc.subjectUranium dioxideen_AU
dc.subjectPilot plantsen_AU
dc.titlePilot plant development of processes for the production of ammonium diuranateen_AU
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