Solution-derived sodalite made with Si- and Ge-ethoxide precursors for immobilizing electrorefiner salt

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• 作者：Brian J. Riley ; ^{brian.riley@pnnl.gov" class="auth_mail" title="E-mail the corresponding author} ; William C. Lepry ; Jarrod V. Crum
• 关键词：Sodalite ; Electrochemical waste forms ; Eutectic salt ; Ethoxide ; Alkoxide
• 刊名：Journal of Nuclear Materials
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：468
• 期：Complete
• 页码：140-146
• 全文大小：1852 K

文摘

Chlorosodalite has the general form of Na₈(AlSiO₄)₆Cl₂ and this paper describes experiments conducted to synthesize sodalite with a solution-based approach to immobilize a simulated spent electrorefiner salt solution containing a mixture of alkali, alkaline earth, and lanthanide chlorides. The reactants used were the salt solution, NaAlO₂, and either Si(OC₂H₅)₄ or Ge(OC₂H₅)₄. Additionally, seven different glass sintering aids (at loadings of 5 mass%) were evaluated as sintering aids for consolidating the as-made powders using a cold-press-and-sinter technique. This process of using alkoxide additives for the Group IV component can be used to produce large quantities of sodalite at near-room temperature as compared to a method where colloidal silica was used as the silica source. However, the small particle sizes inhibited densification during heat treatments.