Volume 4, 2020

Radiochemistry

TITANATE-BASED CERAMIC AS A MATRIX FOR CURIUM AND RARE EARTH ELEMENT FRACTION OF RADIOACTIVE WASTE IMMOBILIZATION

S.S. Danilov, A.V. Frolova, S. E. Vinokurov, S.V. Yudintsev, B.F. Myasoedov

Pages: 138-141

DOI: 10.21175/RadProc.2020.29

The effective isolation of radioactive waste (RW) from the environment is the main problem for the further development of nuclear power. The main phases in titanate-based ceramics are perovskite, rutile, zirconolite and murataite. Murataite grains have a zonal structure with high content of rare earth elements at the center of structure and low content of these at edges, that precludes their leaching in contact with a solution. Murataite-based ceramics containing simulated rare earth elements of high level waste (HLW) were produced via melting of oxide mixtures in a resistance furnace at 1500°C. All samples were composed of mainly murataite and minor perovskite, crichtonite, zirconolite, and pyrophanite/ilmenite phases. Thus, murataite is the dominant host phase for a sample containing zirconium oxide. All samples were analyzed by scanning electron microscopy with an energy dispersive X-ray spectroscopy. Elemental leaching rates from the ceramic with low perovskite content were lower by one order of magnitude then leaching rates for high perovskite content.
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S.S. Danilov, A.V. Frolova, S.E. Vinokurov, S.V. Yudintsev, B.F. Myasoedov, "Titanate-based ceramic as a matrix for curium and rare earth elements fraction of radioactive waste immobilization," RAD Conf. Proc, vol. 4, 2020, pp. 138–141, http://doi.org/10.21175/RadProc.2020.29