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Study on the immobilization of cesium absorbed by copper ferrocyanide using allophane through pressing/sintering method
Journal of Nuclear Materials ( IF 3.1 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.jnucmat.2020.152008
Yang Cheng , Yiqi Wang , Hongji Sang , Yan Wu , Yuezhou Wei

The development of the Cs stable immobilization method contributes to the treatment of insoluble ferrocyanide sludge containing radioactive Cs (Cs–CuFC) generated by the Fukushima nuclear accident. Cs–CuFC begins to decompose at 200 °C, and Cs in Cs–CuFC volatilizes after being oxidized to Cs2O in air at high temperature. Therefore, Cs has an immobilization ratio of less than 4% at 1000 °C. Meanwhile, Cs–CuFC generates poisonous gases, such as HCN, NO, and NH3, and the release of HCN is suppressed in active atmosphere. For the stable immobilization of Cs, a pressing/sintering method that uses allophane as an additive is examined. Allophane is mixed uniformly with Cs–CuFC in a mass ratio of 1:1, and the mixture is sintered at different temperatures to obtain solidified bodies. A stable crystal called pollucite is formed after sintering above 900 °C, and the immobilization ratio of Cs is approximately 100%. Part of pollucite is concentrated on some spots on the surface of solidified bodies. These bodies have good mechanical properties for geological storage. The leaching percentage of Cs for the solidified bodies sintered at 1100 °C in distilled water is less than 0.01% and 0.4% at 25 °C and 90 °C, respectively, thereby indicating that the solidified bodies have excellent immobilization properties and chemical stability.



中文翻译:

铝镁石压榨/烧结法固定亚铁氰化铜吸收的铯的研究

Cs稳定固定方法的发展有助于处理由福岛核事故产生的含有放射性Cs(Cs–CuFC)的不溶性亚铁氰化物污泥。Cs–CuFC在200°C时开始分解,并且Cs–CuFC中的Cs在高温下在空气中被氧化为Cs 2 O后挥发。因此,Cs在1000℃下的固定率小于4%。同时,Cs–CuFC会产生有毒气体,例如HCN,NO和NH 3,并且在活跃的气氛中抑制了HCN的释放。为了稳定地固定Cs,研究了使用铝脲烷作为添加剂的压制/烧结方法。铝脲烷与Cs-CuFC以1:1的质量比均匀混合,并在不同温度下烧结混合物以获得凝固体。在高于900°C的温度下烧结后,形成了稳定的结晶物,称为钙土,Cs的固定率约为100%。一部分的石灰石集中在凝固体表面的一些斑点上。这些物体具有良好的地质存储机械性能。在1100°C的蒸馏水中烧结的凝固体中Cs的浸出率分别在25°C和90°C时小于0.01%和0.4%,

更新日期:2020-01-22
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