Development of monazite glass-ceramic wasteforms for the immobilisation of pyroprocessing wastes

Abstract

Pyrochemical reprocessing is a potential route for the reprocessing of fuels from next-generation reactors. Lanthanide fission products may be separated from the reprocessing salt by a number of methods; however, salts may be entrained in the resultant product. This work demonstrates conceptual monazite glass-ceramic wasteforms based on the quarternary (100−x)(10Na2O–36Fe2O3–54P2O5)–xLa2O3 (x = 5, 10, 15), with La2O3 as a surrogate for the lanthanide oxide waste stream. Samples were produced by the melting of La2O3 with a sodium-iron-phosphate glass frit and characterised by XRD and SEM–EDX. The monazite phase was successfully formed at all waste loadings with clear segregation of La to the crystalline phase; however, high La2O3 loading (>10 mol%) was found to destabilise the glass system resulting in gross crystallisation. These initial results indicate that monazite glass-ceramics are promising wasteforms for this waste stream.

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Item Type:	Article
Authors/Creators:	Bailey, D.J. https://orcid.org/0000-0002-0313-8748 Gardner, L.J. https://orcid.org/0000-0003-3126-2583 Harrison, M.T. McKendrick, D. Hyatt, N.C.
Copyright, Publisher and Additional Information:	© 2022 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
Dates:	Published: March 2022 Published (online): 9 March 2022 Accepted: 2 February 2022
Institution:	The University of Sheffield
Academic Units:	The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield)
Funding Information:	Funder Grant number Engineering and Physical Sciences Research Council EP/S011935/1; EP/S01019X/1; EP/T011424/1
Depositing User:	Symplectic Sheffield
Date Deposited:	01 Apr 2022 09:59
Last Modified:	01 Apr 2022 09:59
Status:	Published
Publisher:	Springer Nature
Refereed:	Yes
Identification Number:	10.1557/s43580-022-00230-5
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:185328

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Development of monazite glass-ceramic wasteforms for the immobilisation of pyroprocessing wastes

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