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- W268467281 abstract "During the transformation of radioactive waste liquors into solids by incorporating them into glasses and ceramic materials or by calcining the residue from evaporation, a large portion of the Ru is volatilized. The volatilization rate depends on the temperature, the duration of the soaking, and the compositions of the gaseous and solid phases. The process is due to the oxidation of Ru to its tetravalent form. Tests were carried out with suspensions of various hydroxides coprecipitated with Ru, using Ru/sup 106/ as tracer. The suspension was dried at 80 deg C andd the activity of the residue determined by means of a BETA counter; this counting operation was repeated after exposure to elevated temperatures for calculating the amount volatilized. The material was heated at a rate of 6.7 deg C/min, soaking at 1200 deg C Eor 15 minutes. Tests with coprecipitated Cr and Fe oxides heated under and Ar blanket showed an absence of volatility of the Ru. In air, the volatilization, due to the formation of RuO/sub 4/, was found to start at 750 deg C with both Fe/sub 2/O/sub 3/ and Cr/sub 2/O/sub 3/. Tests were also made with binary systems consisting of Fe/sub 2/O/sub 3/ and CaOmore » or SiO/sub 2/. The results indicated that 3 stages are included in the volatilization reaction: direct volatilization of Ru from the surface of the particles according to a monomolecular reaction; a transition stage and finally, a diffusion stage. In the case of the binary mixtures, the volatilization follows the liquidus line, reaching its msximum at the lowest melting temperature. (TTT)« less" @default.
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- W268467281 date "1963-09-01" @default.
- W268467281 modified "2023-09-23" @default.
- W268467281 title "INVESTIGATION OF THE HIGH-TEMPERATURE VOLATILIZATION MECHANISM OF RUTHENIUM COPRECIPITATED WITH VARIOUS DEPOSITS" @default.
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