Comparison of ion exchange methods for lithium-7 isotopic enrichment for application in PWR reactors
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Brazilian Journal of Radiation Sciences
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7Li in the form of lithium hydroxide monohydrate (LiOH·H₂O), remains liquid
over a wide temperature range (180 to 1340ºC), making it an excellent pH controller on
reactor coolant in Pressurized Water Reactors (PWRs). In contrast, 6Li is a strong neutron
absorber and unsuitable for PWRs, whereas 7Li has a low neutron cross-section, making
it ideal for reactor use. Enriching 7Li to over 99.95% is essential but complex. The Colex
method, involving mercury, was used for enrichment but was banned in the USA due to
environmental concerns. Currently, Russia and China are the primary sources of enriched
7Li. A mercury-free procedure to obtain this isotope is necessary, ion exchange
techniques, including frontal analysis, elution, and displacement chromatography, offer
alternative enrichment methods. This study evaluates these techniques to achieve the
required 7Li enrichment for PWR applications. Preliminary results showed an abundance
of 7Li at 95.65% after displacement of 830 cm.
Como referenciar
OTOMO, J.I.; SANTOS, D.C.G.; FERREIRA, J.C.; BERGAMASCHIA, V.S.; BUSTILLOS, J.O.V. Comparison of ion exchange methods for lithium-7 isotopic enrichment for application in PWR reactors. Brazilian Journal of Radiation Sciences, v. 12, n. 4B, p. 1-13, 2025. DOI: 10.15392/2319-0612.2024.2640. Disponível em: https://repositorio.ipen.br/handle/123456789/49655. Acesso em: 29 Apr 2026.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.