Separation of Radioactive Strontium from Alkaline Nuclear Waste Solutions with the Highly Effective Ion Exchanger SrTreat
Separation of Radioactive Strontium from Alkaline Nuclear Waste Solutions with the Highly Effective Ion Exchanger SrTreat
复制标题
使用高效离子交换剂 SrTreat 从碱性核废料溶液中分离放射性锶
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
E. Tusa
中科院分区：
文献类型：
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作者：
J. Lehto;L. Brodkin;R. Harjula;E. Tusa
SrTreat 是一种无机离子交换剂，其结构基于钛酸钠。它呈颗粒状，适用于填充床操作。事实证明，这种交换器在去除碱性核废料溶液中的放射性锶方面非常有效。 SrTreat 于 1996 年在俄罗斯摩尔曼斯克首次用于工业规模的分离过程。在此操作期间，对 2500 个床体积的中等盐浓度的低活性 (22 kBq/) 废液进行了 90 Sr 净化，平均净化系数为 7400。该交换器特别适合对碱性浓缩硝酸钠溶液进行净化，这种溶液是一些核燃料后处理厂中和储存废物的特征。日本原子能研究所 (JAERI) 于 1997 年夏天投入使用了一种新的放射性核素去除系统，成功地利用 SrTreat 从中和的碱性后处理废液中去除了 90 Sr (7.4 GBq/)。在使用 JAERI 模拟物进行的实验室规模测试中，将 pH 值调整为 10，NaNO 3 的浓度为 2.4 mol/ 。使用SrTreat柱可以从超过1000个床体积中去除锶，从而获得2000至15 000之间的净化因子。除了SrTreat柱去除锶的性能之外，还讨论了SrTreat上锶离子交换平衡的基础研究以及pH和干扰阳离子对锶交换的影响。
SrTreat is an inorganic ion exchanger whose structure is based on a sodium titanate. It is available in granular form and is suitable for use in packed-bed operations. This exchanger has proved to be highly effective in the removal of radioactive strontium from alkaline nuclear waste solutions. SrTreat was used for the first time in an industrial-scale separation process in 1996 in Murmansk, Russia. During that operation 2500 bed volumes of low-active (22 kBq/) waste solution with a moderate salt concentration was decontaminated from 90 Sr with an average decontamination factor of 7400. The exchanger is especially suited for the decontamination of alkaline concentrated sodium nitrate solutions that are characteristic of neutralized stored wastes from some nuclear-fuel-reprocessing plants. At the Japanese Atomic Energy Research Institute (JAERI), a new radionuclide-removal system, successfully utilizing SrTreat for the removal of 90 Sr (7.4 GBq/) from a neutralized alkaline reprocessing waste solution, was commissioned in the summer of 1997. In the laboratory-scale tests with a JAERI simulant, adjusted to pH 10 and having 2.4 mol/ of NaNO 3 . strontium could be removed from more than 1000 bed volumes with an SrTreat column, thereby obtaining a decontamination factor between 2000 and 15 000. In addition to the performance of SrTreat columns in strontium removal, basic studies on the ion exchange equilibrium of strontium on SrTreat and the effects of pH and interfering cations on strontium exchange are discussed.