Solidification of borate radioactive resins using sulfoaluminate cement blending with zeolite

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• 作者：Qina  ; Sun^a ; Junfeng  ; Li^b ; Jianlong  ; Wang^a ;   ; ^b ;   ; ^{wangjl@tsinghua.edu.cn}
• 刊名：Nuclear Engineering and Design
• 出版年：2011
• 出版时间：December 2011
• 年：2011
• 卷：241
• 期：12
• 页码：5308-5315
• 全文大小：394 K

文摘

The solidification of borate radioactive resins using sulfoaluminate cement (SAC) blending with zeolite was investigated, and the performance of SAC¨Czeolite matrix for immobilizing borate resin was evaluated based on the compressive strength, leachability and mineral phases of solidified waste forms. The experimental results showed that the 28 d compressive strength of resin SAC¨Czeolite waste forms was 18.8 MPa, the cemented waste forms meet the requirement of water, freezing, irradiation and impact resistance tests. The leaching processes of Cs⁺ and Co²⁺ were diffusion-limit step. The leachability of Cs⁺ was higher than Co²⁺ no matter what the matrix contained zeolite or not, but leachability of both cations was reduced by adding 5 % zeolite. For SAC¨Czeolite matrix, the leaching rates of Cs⁺ and Co²⁺ were 6.40 ¡Á 10^? cm/d and 1.62 ¡Á 10^? cm/d, and the cumulative leaching fractions were 2.9 ¡Á 10^? cm and 2.3 ¡Á 10^? cm, respectively. The X-ray diffraction (XRD) analysis suggested that B(OH)₄^{?/sup> was incorporated by substitution of SO₄?/sup> in the crystalline structure of ettringite (3CaO¡¤Al₂O₃¡¤3CaSO₄¡¤32H₂O).}