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Synthesis and Assement of Immofilization-Rock for Simulated HLLW

模拟 HLLW 固定岩石的合成与评估

基本信息

批准号：
60880025
负责人：
TETSUO YOSHIO
金额：
$ 2.11万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1987
项目状态：
已结题

项目摘要

SYNROC technology has been inversitgated as an alternative method for borosilicate glass to immobilize HLLW (high level radioactive liquid waster). We payed particular attertion to rhe following resewarch subjects;1) Synthesizing waste forms immobilizing high-alkali containing waste in Japan (simulated waste were used), 2) applying the pressureless-sintering metrhod to synthesize the waste forms in order to develop conventional and financial process. In addition, the leaching characteristics of SYNROC were compared with that of borosilicate glass. Optimum preparation conditions were derermined ad follows; firing rermperatures were 1200, 1170 and 1130 C for waste loading 10,20 and 30 wt%, respectively, in Ar and H_2 mixed gas. The waste-form specimens were characterized by X-ray diffraction analysis and SEM. and their stability assessed by leach-testing. The waste-form specimens have desitable characteristice,i.e., fairly high density ( 3.8 g/cm^3), high waste loading ( 30 wt%), and leach resistance. Component leach rate in SYNROC specimens except for alkali component, Cs_2O and Na_2O, showed significantly low value compared to that of borosilicate glass. However, alkali-component leach rate in SYNROC showed nearly the same value for similat waste-loading borosilicate glass. SEM observation revealed that the leaching from SYNROC were mainly originated from depostted alkali in grain boundary. This finding suggests that improving the grain boundary of SYNROC should result in a further improved waste-form procuct.

SYNROC技术是硼硅酸盐玻璃处理高放废液的替代方法。本文着重研究了以下几个方面的问题：1）合成日本高碱废弃物固化剂（模拟废弃物）; 2）应用无压烧结法合成废弃物固化剂，以发展传统的、经济的工艺。此外，SYNROC的浸出特性进行了比较，硼硅酸盐玻璃。确定了最佳制备条件为：在Ar和H_2混合气体中，垃圾含量分别为10、20和30wt%时，烧成温度分别为1200、1170和1130 ℃。通过X射线衍射分析和扫描电镜对废弃物试样进行了表征。并通过热稳定性试验评价其稳定性。废物形式的标本具有desitable特性，即，相当高的密度（3.8 g/cm^3）、高废物负载（30 wt%）和抗浸出性。与硼硅酸盐玻璃相比，SYNROC样品中除碱组分Cs_2O和Na_2O外的组分浸出率均显着降低。然而，SYNROC中的碱组分浸出率显示出与类似废物装载硼硅酸盐玻璃几乎相同的值。扫描电镜观察表明，SYNROC的浸出主要来自于晶界上的碱沉淀。这一发现表明，改善SYNROC的晶界应导致进一步改善废物形式的产品。