Abstract
The physicochemical properties of synthetic calcium aluminosilicate (SCAS) monoliths produced from fly ash, limestone, and sand in a three-stage process (filtration combustion with superadiabatic heating, fine grinding, and pressing) were studied. It was found that hydration and carbonization in a SCAS monolith during long hardening under natural (laboratory) conditions lead to perfection of the structure of pores, which improves its physicochemical properties. The presence of unreacted β-Ca2SiO4 in the SCAS monolith throughout the hardening period ensures its high immobilizing properties under the action of the hydrosphere on the matrix containing hazardous (including radioactive) wastes because of calcium hydrosilicate gel formation, which decreases the pore space volume. Examples were given for determining the dependence of the total rate of leaching of SCAS monoliths by deionized water at 90°C on the treatment time (MCC-1 test). The rate of leaching of a SCAS-MRW monolith (where MRW is model radioactive waste of closed nuclear fuel cycle) was found to be 6.7 × 10−7, 7.2 × 10−7, and 8.3 × 10−7 g cm−2 day−1 at MRW contents of 10, 20, and 30 wt %, respectively. The possibility of integrated solutions of some environmental problems using energy- and resource-saving technologies was considered.
Published Version
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