Abstract
Leaching rate, phase composition, specific surface area, pore volume, and pore size distribution of synthetic calcium aluminosilicate (SCAS) promising for immobilization of radioactive wastes was studied. The initial SCAS powder for forming monoliths was prepared by superadiabatic combustion of the charge containing fly ash of thermoelectric power stations and limestone. The monoliths were prepared from SCAS by two procedures: (1) solidification with water under common conditions with subsequent prolonged carbonation in air and (2) cold pressing of air-dry powder material. In the first case, a high-strength monolith was formed by filling of the pore volume with a mixture of calcium carbonate in various crystalline polymorphic modifications, and in the second case, by pozzolanic reaction of active silica with the products of β-dicalcium silicate hydration. It was found that, at contact with solution, the pores in the monolithic samples are filled with a calcium hydrosilicate gel decreasing their porosity and, in turn, leaching rate. SCAS matrices exceed special glasses and are close to some ceramic compositions in the safety of immobilization of alkali and alkaline-earth elements.
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Chervonnyi, A.D., Chervonnaya, N.A. Use of Synthetic Calcium Aluminosilicate for Immobilization of Radioactive Wastes. Radiochemistry 46, 190–197 (2004). https://doi.org/10.1023/B:RACH.0000024950.03863.c2
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DOI: https://doi.org/10.1023/B:RACH.0000024950.03863.c2