Immobilization of sodium and phosphorus-bearing PW-7a waste in SYNROC. Progress report. [SYNROC C]

Ringwood, A. E.

doi:10.2172/6749181

Cited by 1 publication

(2 citation statements)

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“…Perovskite remains as the predominant original Synroc‐C titanate phase with a new major peak in the XRD pattern at 2 θ = 32.3° indicating the presence of magnetoplumbite‐type phase (PDF: 01‐072‐0738, space group P 6 3 / mmc ). Magnetoplumbite phases were reported previously with Synroc‐C phases under highly reducing conditions 23 . Further, the low intensity peaks at 2 θ = 26.6°, 29.7°, 36.2° in the XRD pattern for the 8 wt.% Ti sample are consistent with the presence of loveringite (PDF: 00‐042‐1368).…”

Section: Resultssupporting

confidence: 82%

“…Magnetoplumbite phases were reported previously with Synroc-C phases under highly reducing conditions. 23 Further, the low intensity peaks at 2θ = 26.6 • , 29.7 • , 36.2 • in the XRD pattern for the 8 wt.% Ti sample are consistent with the presence of loveringite (PDF: 00-042-1368). However, unequivocal phase identification for these low intensity peaks for this sample was challenging given the wide range of phases possible via solid solutions within the CaO-Al 2 O 3 -ZrO 2 -TiO 2 and BaO-TiO 2 -Al 2 O 3 systems.…”

Section: Phase Assemblage and Structure Of Synroc-c With Ti Additionsupporting

confidence: 56%

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Effect of Ti‐metal addition on hot‐isostatically pressed (HIPed) Synroc‐C

et al. 2023

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Synroc, a candidate nuclear wasteform and Synroc technology, a waste treatment solution utilizing hot‐isostatic pressing (HIPing) have significant potential for the immobilisation of challenging nuclear wastes from both current and innovative reactors and fuel cycles. Hot isostatic press (HIP) consolidation is undertaken within sealed metal HIP canisters, where metal buffers (e.g., Ti, Fe and Ni) can be incorporated to control the redox environment within the canister. This study, for the first time, reports the effect of varying Ti‐metal addition (0, 2, 4, and 8 wt.%) on phase formation, microstructural characteristics, and wasteform performance for HIP consolidated Synroc‐C containing 20 wt.% simulated PUREX type (PW‐4b) high level waste. Quantitative X‐ray diffraction analysis, scanning electron microscopy‐energy dispersive X‐ray spectroscopy (EDS) and transmission electron microscopy‐EDS analyses were undertaken for analytical investigations. The chemical durability of the samples was assessed using ASTM C1220‐21 standard test. Hot‐isostatically pressed (HIPed) samples with 0 and 8 wt.% Ti added for redox control produced unfavourable phase formation. However, the HIPed samples with Ti additions of 2 and 4 wt.% as a redox buffer showed the desired phase formation of Synroc‐C without any significant change to the partitioning of waste elements among the phases along with compatible durability results, when compared to previous literature for hot uniaxial pressing (HUPed) or sintered materials.

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Section: Resultssupporting

confidence: 82%

Section: Phase Assemblage and Structure Of Synroc-c With Ti Additionsupporting

confidence: 56%