National Institute for Material Science, 1-2-1, Sengen, Tsukuba, Ibaraki, 305-0047, Japan.
Vietnam Atomic Energy Institute, Nuclear Research Institute, Da Lat, Vietnam.
Sci Rep. 2018 Oct 9;8(1):15051. doi: 10.1038/s41598-018-32943-9.
The present paper describes an extremely efficient, reproducible and inexpensive chemical handling method for converting the nuclear wastes contaminated by radioactive cesium to stable inorganic crystal, pollucite (CsAlSiO), which is promising as a form of the final storage. In this processing, the clays are used as a source for aluminum and silicon, and it is important to get a well-mixed homogenous solution by the aid of some heat and pressure. The present method proposes the use of ethylene glycol as a solvent, rather than water. It has been found that one can obtain crystalline pollucite by heating up to 350 °C in a high-pressure container (15 MPa), mixed with montmorillonite - an abundant natural clay and ethylene glycol. It has been found that the reduction of the amount of water helps to achieve very high confinement rate in a reasonable time of few20 h. This will be fairly important in processing contaminated water in the nuclear power plant. The influence of seawater has been also examined.
本文描述了一种极其高效、可重复且廉价的化学处理方法，可将放射性铯污染的核废料转化为稳定的无机晶体泡沸石（CsAlSiO），有望作为最终储存形式。在该处理过程中，粘土被用作铝和硅的来源，通过加热和加压来获得均匀混合的均相溶液非常重要。本方法提出使用乙二醇作为溶剂，而不是水。已经发现，通过在高压容器（~15 MPa）中加热至 350°C，可以与蒙脱石（一种丰富的天然粘土和乙二醇）混合获得结晶泡沸石。已经发现，减少水量有助于在合理的 20 小时内实现非常高的约束率。这在处理核电站污染水中将非常重要。还研究了海水的影响。
