Abstract

With regard to the radioactive waste vitrification technology, literature data on the behavior of technetium and its release into the gas phase are reviewed. In various types of spent nuclear fuel (SNF), the content of technetium varies from 16 to 1350 g per 1 ton of SNF. In nitric acid solutions, technetium exists mainly in the form of pertechnetate anions TcO₄^– and, when heated, is released into the gas phase in the form of Тс₂О₇ and НТсО₄. The volatility of technetium during vitrification varies from fractions of a percent to 70%. Two directions of technological solutions for capturing technetium from the gas phase are described: low-temperature methods using liquid-type apparatus and high-temperature methods with capturing onto zeolite and aluminosilicate filters.

中文翻译：

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放射性废物玻璃化技术气体排放中的锝（科技信息概览）

摘要

关于放射性废物玻璃化技术，回顾了有关锝行为及其向气相释放的文献数据。在各种类型的乏核燃料 (SNF) 中，锝的含量从每 1 吨 SNF 16 到 1350 克不等。在硝酸溶液中，锝主要以高锝酸盐阴离子 TcO ₄的形式存在^-加热时，以 Тс ₂ О ₇和 НТсО ₄的形式释放到气相中. 玻璃化过程中锝的挥发性从百分之几到 70% 不等。描述了从气相中捕获锝的技术解决方案的两个方向：使用液体型设备的低温方法和使用沸石和铝硅酸盐过滤器捕获的高温方法。