Pyroprocess Technology Division, Korea Atomic Energy Research Institute 111, Daedeok-daero, 989beon-gil, Yuseong-gu, Daejeon 34057, Republic of Korea.
Pyroprocess Technology Division, Korea Atomic Energy Research Institute 111, Daedeok-daero, 989beon-gil, Yuseong-gu, Daejeon 34057, Republic of Korea.
J Hazard Mater. 2017 Oct 5;339:73-81. doi: 10.1016/j.jhazmat.2017.05.062. Epub 2017 Jun 8.
Radioactive Cs released from damaged fuel materials in the event of nuclear accidents must be controlled to prevent the spreading of hazardous Cs into the environment. This study describes a simple and novel process to safely manage Cs gas by capturing it within ceramic filters and converting it into monolithic waste forms. The results of Cs trapping tests showed that CsAlSiO was a reaction product of gas-solid reactions between Cs gas and our ceramic filters. Monolithic waste forms were readily prepared from the Cs-trapping filters by the addition of a glass frit followed by thermal treatment at 1000°C for 3h. Major findings revealed that the Cs-trapping filters could be added up to 50wt% to form durable monoliths. In 30-50wt% of waste fraction, CsAlSiO was completely converted to pollucite (CsAlSiO), which is a potential phase for radioactive Cs due to its excellent thermal and chemical stability. A static leaching test for 28 d confirmed the excellent chemical resistance of the pollucite structure, with a Cs leaching rate as low as 7.21×10gm/d. This simple scheme of waste processing promises a new route for radioactive Cs immobilization by synthesizing pollucite-based monoliths.
在核事故中，从受损燃料材料中释放的放射性 Cs 必须加以控制，以防止危险的 Cs 扩散到环境中。本研究描述了一种简单而新颖的工艺，通过将 Cs 气体捕获在陶瓷过滤器中并将其转化为整体式废物形式来安全地管理 Cs 气体。Cs 捕获测试的结果表明，CsAlSiO 是 Cs 气体与我们的陶瓷过滤器之间气固反应的产物。通过添加玻璃料并在 1000°C 下热处理 3h，很容易从 Cs 捕获过滤器制备整体式废物。主要发现表明，Cs 捕获过滤器可以添加高达 50wt%以形成耐用的整体式。在 30-50wt%的废物部分中，CsAlSiO 完全转化为泡沸石（CsAlSiO），由于其优异的热稳定性和化学稳定性，泡沸石是放射性 Cs 的潜在相。28 天的静态浸出试验证实了泡沸石结构的优异耐化学性，Cs 的浸出率低至 7.21×10gm/d。通过合成基于泡沸石的整体式废物，这种简单的废物处理方案为放射性 Cs 的固定化提供了一条新途径。
