Preformed minerals as Synroc precursors - a technique for mitigating acid attack during Synroc processing

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dc.contributor.authorStewart, MWAen_AU
dc.contributor.authorBartlett, JRen_AU
dc.contributor.authorReeve, KDen_AU
dc.date.accessioned2025-08-27T04:20:04Zen_AU
dc.date.available2025-08-27T04:20:04Zen_AU
dc.date.issued1989en_AU
dc.date.statistics2025-08-01en_AU
dc.descriptionPhysical copy of the journal held by ANSTO Library at DDC: 666/47. Conference name also called "2nd International Ceramic Conference and Exhibition" on prefaceen_AU
dc.description.abstractThe chemical durability of "preformed mineral-route" Synroc precursors in acidic simulated high level nuclear waste (HLW) solutions was examined. The precursor powders were prepared from mixtures of CaTiO3, BaTiO3, CaZrO3, Ca3Al2O6, AI(OH)3 and TiO2. Except for Ca3Al2O6, less than 5% of the Ba and Ca was leached from these powders over a 4 hour interval in 2 mole per dm3 HNO3 solutions, whereas essentially all the Ba and Ca were leached from conventional "alkoxideroute" precursor powders under comparable conditions. Leaching in this latter case can be minimised by neutralising with NH4OH during mixing of the HLW and precursor powder. However, this strategy has a number of disadvantages, namely: (5) the NH4NO3 formed may decompose explosively during calcination; (ii) it will lead to hydrolysis and subsequent inhomogeneous precipitation of some cationic species from the HLW solution; and (iii) it represents an additional processing step. Hot-pressed Synroc samples prepared from the "preformed mineral-route" powders had properties similar to those of consolidated "oxide-route" Synroc. The microstructure, chemical durability and phase composition of monoliths incorporating HLW will be discussed.en_AU
dc.identifier.citationStewart, M. W. A., Bartlett, J. R., & Reeve, K. D. (1989). Preformed minerals as Synroc precursors - a technique for mitigating acid attack during Synroc processing. Presentation to the International Ceramic Conference (AUSTCERAM 90: ceramics technology - sharing the knowledge), Perth, Western Australia, 26-31 August 1990. In Journal of the Australian Ceramic Society, 25(2), 75.en_AU
dc.identifier.conferenceenddate1990-08-31en_AU
dc.identifier.conferencenameInternational Ceramic Conference (AUSTCERAM 90: ceramics technology - sharing the knowledge)en_AU
dc.identifier.conferenceplacePerth, Western Australiaen_AU
dc.identifier.conferencestartdate1990-08-26en_AU
dc.identifier.issn0004-881 Xen_AU
dc.identifier.issue2en_AU
dc.identifier.journaltitleJournal of the Australian Ceramic Societyen_AU
dc.identifier.pagination75en_AU
dc.identifier.urihttps://apo.ansto.gov.au/handle/10238/16415en_AU
dc.identifier.volume25en_AU
dc.language.isoenen_AU
dc.publisherTrans Tech Publicationsen_AU
dc.subjectMineralsen_AU
dc.subjectSynroc processen_AU
dc.subjectLeachingen_AU
dc.subjectPrecipitationen_AU
dc.subjectDecompositionen_AU
dc.subjectPowdersen_AU
dc.subjectCalcinationen_AU
dc.subjectHot pressingen_AU
dc.subjectOxidesen_AU
dc.subjectMicrostructureen_AU
dc.titlePreformed minerals as Synroc precursors - a technique for mitigating acid attack during Synroc processingen_AU
dc.typeConference Abstracten_AU
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