Separation of Boric Acid from PWR Waste by Volatilization During Evaporation
Separation of Boric Acid from PWR Waste by Volatilization During Evaporation
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DOI：
10.1080/01496399708003227
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发表时间：
1997
影响因子：
2.8
通讯作者：
A. Bruggeman;J. Braet;F. Smaers;P. Regge
中科院分区：
文献类型：
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作者：
A. Bruggeman;J. Braet;F. Smaers;P. Regge
摘要SCK·CEN开发了一种在压水式轻水反应堆废液蒸发过程中和/或之后分离硼酸的工艺。关键目标是实现更高的废物体积减少系数，同时保持较低的活动排放限制。另一个目标是获得精制的硼酸以供循环使用。该工艺是基于硼酸在水蒸气中的挥发性。液体废物在半连续蒸发器中处理，该蒸发器比目前的蒸发器在更高的温度下优先运行。装入硼酸的蒸气被送到塔中进行部分回流的分步冷凝。通过这种方法，可以得到高度浓缩的废物，其中含有所有的放射性和化学杂质以及少量的硼，还可以得到可重复使用的浓缩的硼酸溶液，以及不含硼的高度净化的废水。如果更换或改装现有蒸发器不太可行，可以调整工艺以处理蒸气。
Abstract SCK·CEN has developed a process to separate boric acid during and/or after evaporation of the liquid waste from pressurized light-water reactors. The key goal is to achieve higher waste volume reduction factors, while maintaining low activity discharge limits. An additional goal is to obtain purified boric acid for recycling. The process is based on the volatility of boric acid in steam. The liquid waste is treated in a semicontinuous evaporator, which operates preferentially at a higher temperature than the present evaporators. The stream loaded with boric acid is fed to a column for fractional condensation with partial reflux. In this way, one obtains a highly concentrated waste that contains all the radioactive and chemical impurities and little boron, a concentrated boric acid solution which can be reused, as well as a highly decontaminated effluent without boron. In case replacement or adaptation of existing evaporators is less practical, one can adapt the process for the treatment of evapor...