SHS Immobilization of Radioactive Wastes

Баринова, Т. В.; Borovinskaya, I. P.; Ратников, В. И.; Ignatjeva, T.I.; Zakorzhevsky, Vladimir V.

doi:10.4028/www.scientific.net/kem.217.193

Cited by 20 publications

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“…Pellets of 3 kg in weight, 25mm in diameter, 20mm in height were made from the green mixture by the method of cold pressing. The pellets were subject to self -propagating high -temperatures synthesis (SHS) densification [3,4]. Preparation of sample.…”

Section: Methodsmentioning

confidence: 99%

Consolidation of HLW into Mineral-Like Materials by the SHS

Zhang

et al. 2011

AMR

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Abstract. Samples of mineral-like materials based perovskite and model high-level wastes (strontium) were fabricated by the SHS-densification and tested. The results of MCC-1, XRD and SEM/EDS analysis show that the major phase is well concordant with the design. The samples were characterized by dense structure and fine chemical stability. It is a durable material with high-level waste loading and is in favor for final geological disposal.

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Section: Methodsmentioning

confidence: 99%

Consolidation of HLW into Mineral-Like Materials by the SHS

Zhang

et al. 2011

AMR

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“…Perovskite exists in several crystallographic forms, such as tetragonal, monoclinic, triclinic, hexagonal, cubic, rhombohedral and orthorhombic. It can also show some polymorphism [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…The interest in ABO3 perovskites results in the ease of changing the nature of cations A and B, leading to a change in the intrinsic materials properties, such as: ferroelectricity, antiferro electricity, magnetism, ferromagnetism, antiferromagnetism, superconductivity, and RW confinement [7,[11][12][13][14]19,20].…”

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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“…Besides that, Muthuraman and his coworkers [24] have proposed combustion synthesis (CS, similar as self-propagating high temperature synthesis, SHS) route for the management of nuclear wastes. Because of the special advantages of high speed, low energy consumption, and simple equipment, the CS technique has been considered as a candidate method for environment protection, such as stabilization of radioactive and toxic wastes [25][26][27]. It is worth pointing out that the reaction speed and generated temperature of CS can be tailored by adjusting the ingredients of raw reactants.…”

Section: Introductionmentioning

confidence: 99%

Combustion synthesis of Hf-doped zirconolite-rich composite waste forms and the aqueous durability

Zhang

Yin

et al. 2019

J Adv Ceram

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Zirconolite is recognized as one of the most durable waste matrices for the disposal of high-level radioactive wastes (HLWs). In this study, HfO 2 was employed as the surrogate of tetravalent actinides. Hf-bearing zirconolite-based composite waste forms (CaZr 1-x Hf x Ti 2 O 7 ) were rapidly prepared by combustion synthesis (CS) using CuO as the oxidant, where quick pressing (QP) was introduced to obtain densified samples. Similar as solid state reaction process, the Zr site of zirconolite can be totally occupied by Hf (x = 1.0) under the CS reaction. The original 2M zirconolite structure was maintained and a small amount of perovskite impurity phase was generated in the final products. The aqueous durability of representative sample (Cu-Hf-0.6) was tested, where the 42-day normalized leaching rates (LR i ) of Ca, Cu, and Hf are 0.25, 3.10×10 -2 , and 1.11×10 -8 g·m -2 ·d -1 .glasses is generally recognized as the first generation waste management method. In recent decades, highly durable ceramic materials have been proposed as an alternative medium for HLW immobilization [4][5][6]. The naturally existed zirconolite and pyrochlore are important actinide-bearing ceramic materials, which exhibit excellent chemical and physical durability over geological time scales [7][8][9][10][11][12]. Zirconolite (ideally CaZrTi 2 O 7 ) was also developed as a crystalline phase to sequester Pu from surplus nuclear weapons, which makes it receive great attention as a potential waste form [13].Zirconolite is formed by the stacking layers of edge shared Ti-O polyhedra (TiO 5 and TiO 6 ) and layers of Ca 2+ and Zr 4+ cations [14]. Due to that the Ti 4+ and Zr 4+ ions can be mutually occupied, the zirconolite J Adv Ceram 2019, 8(3): 448-455 449 www.springer.com/journal/40145

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SHS Immobilization of Radioactive Wastes

Cited by 20 publications

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Consolidation of HLW into Mineral-Like Materials by the SHS

Consolidation of HLW into Mineral-Like Materials by the SHS

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

Combustion synthesis of Hf-doped zirconolite-rich composite waste forms and the aqueous durability

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SHS Immobilization of Radioactive Wastes

Cited by 20 publications

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Consolidation of HLW into Mineral-Like Materials by the SHS

Consolidation of HLW into Mineral-Like Materials by the SHS

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

Combustion synthesis of Hf-doped zirconolite-rich composite waste forms and the aqueous durability

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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