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Preparation and characterisation of Synroc precursor powders
Journal article   Peer reviewed

Preparation and characterisation of Synroc precursor powders

J L Woolfrey and John R Bartlett
Key Engineering Materials, Vol.53-55, pp.686-692
1991
DOI: https://doi.org/10.4028/www.scientific.net/KEM.53-55.686
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https://doi.org/10.4028/www.scientific.net/KEM.53-55.686View
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Abstract

Engineering
A series of chemical processes, based on alkoxide hydrolysis, have been developed at ANSTO for preparing multicomponent titanate powders, such as Synroc. Synroc is a complex, multiphase, titanate ceramic designed to immobilise High Level Waste (HLW) from nuclear reactors. The precursor powder contains TiO2, ZrO2, Al2O3, BaO, and CaO in relative mass abundances of (70.4 to 76.4), (5.5 to 8.5), (3.5 to 5.5), (4.6 to 6.6) and (10.1 to 12.1) percent, respectively. Synroc powders are routinely produced by a method involving the base-catalysed hydrolysis of Ti, Zr and Al alkoxides, with simultaneous sorption of Ca2+ and Ba2+ cations. This paper discusses selected aspects of the process chemistry of two different chemical routes, involving the hydrolysis of ethanolic solutions containing either 3 or 5 alkoxide components, and examines the variations in particle morphology which occurs during processing. The physical characteristics of the powders produced and their effect on subsequent calcination and hot-pressing operations are also examined.

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Chemistry, Applied
Engineering, Mechanical
Materials Science, Ceramics
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