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Basic study of formation of acicular crystals by chemical reactions between RuO2 and NaNO3 in a waste vitrification process
Journal of Nuclear Science and Technology ( IF 1.5 ) Pub Date : 2020-12-28 , DOI: 10.1080/00223131.2020.1864493
Tsuyoshi Usami 1 , Kazuyoshi Uruga 1 , Takeshi Tsukada 1
Affiliation  

ABSTRACT

Aggregates of acicular RuO2 occur in high-level waste glass. Large aggregates may settle rapidly in the glass, providing a more efficient electrical path on the melter bottom and interfering with the Joule heating of the glass. To clarify the formation mechanism of aggregates and to develop countermeasures to such formation, chemical reactions between RuO2 and NaNO3 with/without borosilicate glass were observed. Sodium ruthenates were formed from a RuO2–NaNO3 mixture heated without the glass or on a flat glass. On the flat glass, aggregates of acicular crystals of RuO2 appeared with a decreasing amount of sodium ruthenates at high temperature. Neither sodium ruthenates nor acicular crystals of RuO2 were formed from the RuO2–NaNO3 mixture well mixed with powdery glass and heated. Results of a series of experiments suggest that acicular crystals of RuO2 and their aggregates formed through the formation and decomposition of sodium ruthenate when the dissolution of sodium into the glass was slower than its reaction with RuO2. Promoting the dissolution of sodium into a glass or reducing the amount of sodium in liquid waste is expected to suppress the formation of aggregates and their sedimentation.



中文翻译:

废物玻璃化过程中RuO2和NaNO3化学反应形成针状晶体的基础研究

摘要

针状RuO 2聚集体出现在高放废玻璃中。大的聚集体可能会在玻璃中迅速沉淀,从而在熔炉底部提供更有效的电气路径并干扰玻璃的焦耳加热。为了阐明聚集体的形成机制并制定针对这种形成的对策,观察了有/无硼硅玻璃的RuO 2和NaNO 3之间的化学反应。钌酸钠是由 RuO 2 -NaNO 3混合物在没有玻璃的情况下或在平板玻璃上加热形成的。在平板玻璃上,RuO 2针状晶体的聚集体在高温下随着钌酸钠的量减少而出现。将 RuO 2 -NaNO 3混合物与玻璃粉充分混合并加热,既没有形成钌酸钠,也没有形成RuO 2 的针状晶体。一系列实验的结果表明,二氧化钌的针状晶体2和它们的聚集体通过钌钠的形成和分解时形成的钠溶解到玻璃是慢于它的用RuO反应2。促进钠溶解到玻璃中或减少液体废物中的钠含量有望抑制聚集体的形成及其沉淀。

更新日期:2020-12-28
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