Precipitation of cerianite crystals and its effect on the rheology of a simplified nuclear glass melt

IF 2.1 3区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

International Journal of Applied Glass Science Pub Date : 2023-07-05 DOI:10.1111/ijag.16639

Jeanini Jiusti, Elise Regnier, Norma Maria Machado, Mohamed Leith Ghazzai, Vincent Malivert, Muriel Neyret, François Faure

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Abstract

In France, high-activity level wastes resulting from nuclear fission are conditioned in a homogeneous sodium-aluminoborosilicate glass by high-temperature vitrification. The tolerance of even a small fraction of crystals could enable an increase in the waste loadings, in addition to promoting process flexibility. If the waste loading were to be increased in French nuclear glass, cerianite (CeO₂) crystals could precipitate. In this study, we investigated the cerianite crystallization in a simplified nuclear glass melt at different temperatures, Ce₂O₃ wt%, and shear conditions. Furthermore, the evolution of the viscosity along with cerianite precipitation was followed. It was found that Ce₂O₃ is highly soluble in the glass melt, as even for a Ce₂O₃ wt% as high as 10% wt, the cerianite fraction in dynamic conditions at 1100°C after 8 h of crystallization was less than 1% vol. In addition, shear strongly accelerates cerianite crystallization and a high Ce₂O₃ content can engender the precipitation of highly branched dendrites. The evolution of the cerianite fraction did not significantly affect the viscosity of the glass melt. Finally, unlike what has been observed in the well-known platinum group metal (PGM)-bearing melts, a glass melt containing .8 vol% of cerianite crystals remains Newtonian.

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铈矿晶体的析出及其对简化核玻璃熔体流变学的影响

在法国，核裂变产生的高活度废物通过高温玻璃化处理置于均匀的钠铝硼硅酸盐玻璃中。除了提高工艺灵活性外，即使是一小部分晶体的容忍度也可以增加废物负荷。如果法国核玻璃中的废料负荷增加，就会析出铈(CeO2)晶体。在本研究中，我们研究了在不同温度、Ce2O3 wt%和剪切条件下，简化核玻璃熔体中铈矿的结晶。研究了黏度随铈矿沉淀的变化规律。结果表明，Ce2O3在玻璃熔体中具有较高的可溶性，即使Ce2O3 wt%高达10% wt，在1100℃的动态条件下，经过8 h的铈矿结晶后，铈矿分数仍小于1%。此外，剪切作用强烈地促进了铈矿的结晶，高Ce2O3含量可导致高支晶的析出。铈矿组分的演化对玻璃熔体的粘度没有显著影响。最后，与已知的含铂族金属(PGM)的熔体不同，含有0.8%铈矿晶体的玻璃熔体仍然是牛顿态的。

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来源期刊

International Journal of Applied Glass Science MATERIALS SCIENCE, CERAMICS-

CiteScore

4.50

自引率

9.50%

发文量

审稿时长

>12 weeks

期刊介绍： The International Journal of Applied Glass Science (IJAGS) endeavors to be an indispensable source of information dealing with the application of glass science and engineering across the entire materials spectrum. Through the solicitation, editing, and publishing of cutting-edge peer-reviewed papers, IJAGS will be a highly respected and enduring chronicle of major advances in applied glass science throughout this century. It will be of critical value to the work of scientists, engineers, educators, students, and organizations involved in the research, manufacture and utilization of the material glass. Guided by an International Advisory Board, IJAGS will focus on topical issue themes that broadly encompass the advanced description, application, modeling, manufacture, and experimental investigation of glass.