Synroc immobilization of high level waste (HLW) bearing a high content of sodium

Luo, Shaohua; Li, Liyu; Tang, Baolong; Wang, Dexi

doi:10.1016/s0956-053x(97)00019-6

Cited by 25 publications

(5 citation statements)

References 6 publications

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“…It is shown here that fluorapatite can accommodate large concentrations of U(VI), and the substitution of this ion leads to a unique distortion of the structure creating a near octahedral coordination. It is interesting to note that the site geometry of U(VI) in apatite is similar to that in other structures, i.e., perovskites, being considered as solid waste forms ( − ). The stability of fluorapatite with high loadings of U(VI) has yet to be determined.…”

Section: Resultsmentioning

confidence: 81%

Structural Characterization of U(VI) in Apatite by X-ray Absorption Spectroscopy

Rakovan

Reeder

Elzinga

et al. 2002

Environ. Sci. Technol.

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X-ray absorption spectroscopy was used to determine the local structure of U(VI) within synthetic fluorapatite at a concentration of 2.3 wt %. Extended X-ray absorption fine structure indicates that U(VI) substitutes into the Ca1 site. To accommodate this substitution the apatite structure significantly distorts such that the Ca1 site approximates octahedral coordination, with six uniform U-0 distances of 2.06A. An X-ray adsorption edge structure, with two inflection points, and optical emission spectra are consistent with 6d orbital crystal field splitting. These results indicate that significant amounts of U(VI) can be accommodated in the apatite structure but with an unexpected coordination, which may bear on the ultimate development of apatite-hosted nuclear-waste forms.

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Section: Resultsmentioning

confidence: 81%

Structural Characterization of U(VI) in Apatite by X-ray Absorption Spectroscopy

Rakovan

Reeder

Elzinga

et al. 2002

Environ. Sci. Technol.

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“…Luo et al 44 presented the leaching rate data on 1 atom percent Cs and Sr doped SYNROC at 110°C in pure water (table 17). It is observed that the leaching rates of these two elements from SYNROC at 110°C are within the same order of magnitude of that of leaching of Cs from 1 atom percent doped Cs-Sr NZP.…”

Section: Discussionmentioning

confidence: 99%

Microwave-assisted low temperature synthesis of sodium zirconium phosphate (NZP) and the leachability of some selected fission products incorporated in its structure — A case study of leachability of cesium

Naik¹,

Deb²,

Chalke

et al. 2010

J Chem Sci

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Microwave-assisted procedure for low temperature solid state synthesis of sodium zirconium phosphate (NZP), a material with the potential for immobilization and disposal of high level nuclear waste, was developed. Three selected fission products, namely, Cesium, Strontium and Tellurium were introduced (substituted) in the NZP matrix during its synthesis at 450°C. Leaching studies were carried out on the fission product substituted NZP sintered at 1000°C, in pure de-ionized water and 80% saturated brine solution at the ambient temperatures of 30°C and 90°C for four weeks. The major part of leaching in all the cases was observed in the first week. The extent of leaching after four weeks was found not exceeded from 12 to 15% of the elements substituted in NZP, which later became negligibly small. The effect of temperature and the nature of leachant on the leaching rate did not indicate any systematic trend. The EDX analysis of the surfaces of the leached NZP pellets showed that the leaching of the dopants is limited mainly to the surface region of the sintered pellets.

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“…Perovskite is a major mineral of Synroc (Synthetic Rock) material. It is able to confine both alkaline and alkaline-earth elements contained in radioactive waste (RW) [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Ftir and Raman Spectroscopic Study of a Complex Perovskite: Ca_0.91-XCe_0.09Rb_0.04Cs_x[(Zr_0.50Ti_0.45)Al_0.05]O₃, X=0.2 to 0.4, Dedicated for Radioactive Waste Confinement

M.Hasnat¹,

Kamel

Moudir

et al. 2020

Advances in Materials Science

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AbstractPerovskite is able to sequester simultaneously, in its structure, both actinides and alkaline-earth elements. This study is an attempt to synthesize a complex perovskite Ca0.91-xCe0.09Rb0.04Csx[(Zr0.50Ti0.45)Al0.05]O3 (0.2≤x≤0.4), doped in the same time, with Ce, Cs and Rb. The synthesis is conducted by sintering at 1150°C during 16h. XRX analysis confirms the perovskite formation. SEM observations show a less porous microstructure. FTIR analysis reveals TiO6, Ti-O-Ti, Ti-O and Zr-O vibrations. Raman spectroscopy indicates many orthorhombic perovskite active modes, as: Ti-O6 and Ti-O3 torsions, ZrO7, CaO8 vibrations, the totally symmetric oxygen, and the O-octahedron cage rotation.

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Synroc immobilization of high level waste (HLW) bearing a high content of sodium

Cited by 25 publications

References 6 publications

Structural Characterization of U(VI) in Apatite by X-ray Absorption Spectroscopy

Structural Characterization of U(VI) in Apatite by X-ray Absorption Spectroscopy

Microwave-assisted low temperature synthesis of sodium zirconium phosphate (NZP) and the leachability of some selected fission products incorporated in its structure — A case study of leachability of cesium

Ftir and Raman Spectroscopic Study of a Complex Perovskite: Ca_0.91-XCe_0.09Rb_0.04Cs_x[(Zr_0.50Ti_0.45)Al_0.05]O₃, X=0.2 to 0.4, Dedicated for Radioactive Waste Confinement

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Synroc immobilization of high level waste (HLW) bearing a high content of sodium

Cited by 25 publications

References 6 publications

Structural Characterization of U(VI) in Apatite by X-ray Absorption Spectroscopy

Structural Characterization of U(VI) in Apatite by X-ray Absorption Spectroscopy

Microwave-assisted low temperature synthesis of sodium zirconium phosphate (NZP) and the leachability of some selected fission products incorporated in its structure — A case study of leachability of cesium

Ftir and Raman Spectroscopic Study of a Complex Perovskite: Ca0.91-XCe0.09Rb0.04Csx[(Zr0.50Ti0.45)Al0.05]O3, X=0.2 to 0.4, Dedicated for Radioactive Waste Confinement

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Ftir and Raman Spectroscopic Study of a Complex Perovskite: Ca_0.91-XCe_0.09Rb_0.04Cs_x[(Zr_0.50Ti_0.45)Al_0.05]O₃, X=0.2 to 0.4, Dedicated for Radioactive Waste Confinement