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Influence of silica fume on radioactive fluoride concentrate liquid waste solidified by magnesium potassium phosphate cement

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Abstract

This paper investigated the influence of silica fume on radioactive fluoride concentrate liquid waste cementation with magnesium potassium phosphate cement (MKPC). The results showed that when the silica fume mass fraction increased from 0 to 20%, the setting time and fluidity of the MKPC slurry decreased, while the 28-day compressive strength of the solidified form increased. The main hydration products were MgKPO4·6H2O and magnesium silicate hydrate (M–S–H). Silica fume had good physical adsorption of cesium, whose 42-day cumulative leaching fraction decreased from 0.083 ± 0.003 to 0.044 ± 0.002 cm. The formation of magnesium fluosilicate and its hydrate led to a decrease of fluorine leaching.

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Acknowledgements

This work was supported by “Young Potential Program of Shanghai Institute of Applied Physics, Chinese Academy of Sciences” (Y955031031) and “Shanghai Sailing Program” (19YF1458100).

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Authors and Affiliations

  1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201800, China

    Zheng-hua Qian, Bo-wen Yu, Shun Zhou, Yan-bo Qiao, Xue-yang Liu, Shuai Wang, Qiang Qin, Ji-fei Ma & Xiao-ling Wu

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  1. Zheng-hua Qian
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  2. Bo-wen Yu
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Qian, Zh., Yu, Bw., Zhou, S. et al. Influence of silica fume on radioactive fluoride concentrate liquid waste solidified by magnesium potassium phosphate cement. J Radioanal Nucl Chem 324, 1013–1019 (2020). https://doi.org/10.1007/s10967-020-07151-3

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  • DOI: https://doi.org/10.1007/s10967-020-07151-3

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