Letter Report on the Issue of Noble Metals in the DWPF Melter

The major factor limiting waste loading in continuous high-level radioactive waste (HL W) melters is an accumulation of particles in the glass discharge riser during a frequent and periodic idling of more than 20 days. An excessive accumulation can produce robust layers a few centimeters thick, which may clog the riser, preventing molten glass from being poured into canisters. Since the accumulation rate is driven by the size of particles we investigated with xray microtomography, scanning electron microscopy, and image analysis the impact of spinel forming components, noble metals, and alumina on the size, concentration, and spatial distribution of particles, and on the accumulation rate. Increased concentrations of Fe and Ni in the baseline glass resulted in the formation of large agglomerates that grew over the time to an average size of ~185±155 11m, and produced >3 mm thick layer after 120 h at 850°C. The noble metals decreased the particle size, and therefore significantly slowed down the accumulation rate. Addition of alumina resulted in the formation of a network of spinel dendrites which prevented accumulation of particles into compact layers.

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Letter Report on the Issue of Noble Metals in the DWPF Melter

Cited by 2 publications

References 10 publications

Determination of Stokes Shape Factor for Single Particles and Agglomerates

Determination of Stokes Shape Factor for Single Particles and Agglomerates

Impact of Particle Agglomeration on Accumulation Rates in the Glass Discharge Riser of HLW Melter

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