Co-immobilization of cesium and strontium containing waste by metakaolin-based geopolymer: Microstructure, mineralogy and mechanical properties

被引:9
作者
Mukiza, Emile [1 ,2 ]
Phung, Quoc Tri [1 ]
Frederickx, Lander [1 ]
Jacques, Diederik [1 ]
Seetharam, Suresh [1 ]
De Schutter, Geert [2 ]
机构
[1] Belgian Nucl Res Ctr, Inst Sustainable Waste & Decommissioning, B-2400 Mol, Belgium
[2] Univ Ghent, Dept Struct Engn & Bldg Mat, Magnel Vandepitte Lab, Technologiepk-Zwijnaarde 60, B-9052 Ghent, Belgium
关键词
Geopolymer; Radioactive waste; Caesium; Strontium; Co-immobilization; FLY-ASH; CRYSTALLINE PHASES; IMMOBILIZATION; TEMPERATURE;
D O I
10.1016/j.jnucmat.2023.154639
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The present study investigated the possibility of co-immobilization of caesium and strontium containing waste by metakaolin-based (MK) geopolymer. 4% of CsNO3 and 4% of Sr(NO3)2 by weight were used as simulants for radioactive Cs and Sr. The effect of Cs and Sr on the geopolymerization kinetics was determined via isothermal calorimetry. Furthermore, the evolution of mechanical properties, microstructure, and mineralogy was analysed. The results showed that Cs exerted no noticeable effect on reaction kinetics while Sr lowered the geo-polymerization degree of MK geopolymer due to part of OH- from the activating solution being consumed by Sr2+, thereby reducing the activating capacity of pore solution. In addition, the pore structure analysis showed that the incorporation of Sr coarsened the microstructure of MK geopolymer while no significant change was observed with Cs. The phase analysis showed that no new phase was formed because of Cs or Sr incorporation. The mechanical properties decreased with Cs and Sr addition and a higher strength loss was observed for Sr-bearing geopolymers than that of Cs-bearing matrices. The strength reduction in Cs-bearing matrices is associ-ated with the accompanying nitrate ions while a more pronounced strength reduction in Sr-bearing specimens is due to the synergistic effect of nitrates and Sr2+ on the geopolymerization. Despite that, the compressive strengths for all tested MK recipes met the minimum Belgian waste form acceptance criteria indicating that MK geopolymer preserved sufficient strength even at high Cs and Sr waste loadings. Thermodynamic modelling based on speciation and saturation index revealed that Cs+ was mainly bound through ion exchange, whereas Sr2+ largely precipitated as SrCO3. More importantly, it was observed that the co-immobilization of Cs and Sr by MK geopolymer is largely influenced by Sr behaviour. Based on the findings, it can be concluded that MK geopolymer is an excellent host material for Cs and Sr-based waste.
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页数:13
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共 59 条
  • [1] Effect of cement addition, solution resting time and curing characteristics on fly ash based geopolymer concrete performance
    Aliabdo, Ali A.
    Abd Elmoaty, Abd Elmoaty M.
    Salem, Hazem A.
    [J]. CONSTRUCTION AND BUILDING MATERIALS, 2016, 123 : 581 - 593
  • [2] Aqueous leachability of metakaolin-based geopolymers with molar ratios of Si/Al=1.5-4
    Aly, Z.
    Vance, E. R.
    Perera, D. S.
    Hanna, J. V.
    Griffith, C. S.
    Davis, J.
    Durce, D.
    [J]. JOURNAL OF NUCLEAR MATERIALS, 2008, 378 (02) : 172 - 179
  • [3] Process intensification of element extraction using centrifugal contactors in the nuclear fuel cycle
    Baker, Alastair
    Fells, Alex
    Carrott, Michael J.
    Maher, Chris J.
    Hanson, Bruce C.
    [J]. CHEMICAL SOCIETY REVIEWS, 2022, 51 (10) : 3964 - 3999
  • [4] Formulation of caesium based and caesium containing geopolymers
    Berger, S.
    Frizon, F.
    Joussot-Dubien, C.
    [J]. ADVANCES IN APPLIED CERAMICS, 2009, 108 (07) : 412 - 417
  • [5] Transmission electron microscopy and nuclear magnetic resonance studies of geopolymers for radioactive waste immobilization
    Blackford, Mark G.
    Hanna, John V.
    Pike, Kevin J.
    Vance, Eric R.
    Perera, Dan S.
    [J]. JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2007, 90 (04) : 1193 - 1199
  • [6] Thermal Resistance Variations of Fly Ash Geopolymers: Foaming Responses
    Cheng-Yong, Heah
    Yun-Ming, Liew
    Abdullah, Mohd Mustafa Al Bakri
    Hussin, Kamarudin
    [J]. SCIENTIFIC REPORTS, 2017, 7
  • [7] Christophe B., 2023, P WAST MAN 2023 PHOE, P8
  • [8] Nanoparticles of Sr(OH)2:: synthesis in homogeneous phase at low temperature and application for cultural heritage artefacts
    Ciliberto, E.
    Condorelli, G. G.
    La Delfa, S.
    Viscuso, E.
    [J]. APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2008, 92 (01): : 137 - 141
  • [9] Impact of sulfate and nitrate incorporation on potassium- and sodium-based geopolymers: geopolymerization and materials properties
    Desbats-Le Chequer, Charlene
    Frizon, Fabien
    [J]. JOURNAL OF MATERIALS SCIENCE, 2011, 46 (17) : 5657 - 5664
  • [10] Profex: a graphical user interface for the Rietveld refinement program BGMN
    Doebelin, Nicola
    Kleeberg, Reinhard
    [J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2015, 48 : 1573 - 1580