Pro-Formed Minerals as Synroc Precursors: A Technique for Mitigating Acid Attack during Processing

M W A Stewart; John R Bartlett; K D Reeve

doi:10.4028/www.scientific.net/KEM.53-55.704

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Pro-Formed Minerals as Synroc Precursors: A Technique for Mitigating Acid Attack during Processing

Journal article

Peer reviewed

Pro-Formed Minerals as Synroc Precursors: A Technique for Mitigating Acid Attack during Processing

M W A Stewart, John R Bartlett and K D Reeve

Key Engineering Materials, Vol.53-55, pp.704-710

1991

DOI: https://doi.org/10.4028/www.scientific.net/KEM.53-55.704

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Abstract

Engineering

Synroc is a multi-phase Ti-Zr-Al-Ca-Ba oxide ceramic, designed to immobilise high level radioactive wastes (HLW) resulting from the reprocessing of spent UO2 nuclear fuel. The current reference Synroc precursor is prepared by hydrolysing an ethanolic solution of Ti, Al and Zr alkoxides with an aqueous solution containing Ba(OH)2 and Ca(OH)2. Consolidated Synroc monoliths, consisting of a mixture of barium hollandite, zirconolite, perovskite, titanium oxides and metallic alloys, are produced by mixing the precursor powder with the HLW solution (containing 2 to 6 mol dm-3 excess HNO3), followed by appropriate drying, calcination and hot-pressing steps. Nearly all of the HLW elements are taken into solid solution in the mineral phases. In this paper, the authors present the results of a theoretical and experimental investigation of cation leaching from selected pre-formed minerals in acidic media. The properties of consolidated Synroc samples produced from these preformed mineral precursors are also discussed.

Details

Title: Pro-Formed Minerals as Synroc Precursors: A Technique for Mitigating Acid Attack during Processing
Authors: M W A Stewart (Author) - Australian Nuclear Science and Technology Organisation Materials Division
John R Bartlett (Author) - Australian Nuclear Science and Technology Organisation Materials Division
K D Reeve (Author) - Australian Nuclear Science and Technology Organisation Materials Division
Publication details: Key Engineering Materials, Vol.53-55, pp.704-710
Publisher: Trans Tech Publications Inc.
Date published: 1991
DOI: 10.4028/www.scientific.net/KEM.53-55.704
ISSN: 0252-1059
Organisation Unit: School of Science and Engineering - Legacy; University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450185202621
Output Type: Journal article

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Web Of Science research areas: Chemistry, Applied; Engineering, Mechanical; Materials Science, Ceramics