Volatilization of heavy metals and radionuclides from soil heated in an induction ``cold`` crucible melter

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The behavior of heavy metals and radionuclides during high-temperature treatment is very important for the design and operational capabilities of the off-gas treatment system, as well as for a better understanding of the nature and forms of the secondary waste. In Russia, a process for high-temperature melting in an induction heated cold crucible system is being studied for vitrification of Low Level Waste (LLW) flyash and SYNROC production with simulated high level waste (HLW). This work was done as part of a Department of Energy (DOE) funded research project for thermal treatment of mixed low level waste (LLW). Soil spiked ... continued below

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10 p.

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Aloy, A.S.; Belov, V.Z.; Trofimenko, A.S.; Dmitriev, S.A.; Stefanovsky, S.V.; Gombert, D. et al. December 31, 1997.

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The behavior of heavy metals and radionuclides during high-temperature treatment is very important for the design and operational capabilities of the off-gas treatment system, as well as for a better understanding of the nature and forms of the secondary waste. In Russia, a process for high-temperature melting in an induction heated cold crucible system is being studied for vitrification of Low Level Waste (LLW) flyash and SYNROC production with simulated high level waste (HLW). This work was done as part of a Department of Energy (DOE) funded research project for thermal treatment of mixed low level waste (LLW). Soil spiked with heavy metals (Cd, Pb) and radionuclides (Cs-137, U-239, Pu-239) was used as a waste surrogate. The soil was melted in an experimental lab-scale system that consisted of a high-frequency generator (1.76 MHz, 60 kW), a cold crucible melter (300 mm high and 90 mm in diameter), a shield box, and an off-gas system. The process temperature was 1,350--1,400 C. Graphite and silicon carbide were used as sacrificial conductive materials to start heating and initial melting of the soil batch. The off-gas system was designed in such a manner that after each experiment, it can be disconnected to collect and analyze all deposits to determine the mass balance. The off-gases were also sampled during an experiment to analyze for hydrogen, NO{sub x}, carbon dioxide, carbon monoxide and chlorine formation. This paper describes distribution and mass balance of metals and radionuclides in various parts of the off-gas system. The leach rate of the solidified blocks identified by the PCT method is also reported.

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10 p.

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INIS; OSTI as DE98054118

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  • International conference on incineration and thermal treatment technologies, Salt Lake City, UT (United States), 11-15 May 1998

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  • Other: DE98054118
  • Report No.: INEEL/CON--97-01241
  • Report No.: CONF-980513--
  • Grant Number: AC07-94ID13223
  • Office of Scientific & Technical Information Report Number: 639739
  • Archival Resource Key: ark:/67531/metadc696425

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  • December 31, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • June 14, 2016, 1:24 p.m.

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Aloy, A.S.; Belov, V.Z.; Trofimenko, A.S.; Dmitriev, S.A.; Stefanovsky, S.V.; Gombert, D. et al. Volatilization of heavy metals and radionuclides from soil heated in an induction ``cold`` crucible melter, article, December 31, 1997; Idaho Falls, Idaho. (digital.library.unt.edu/ark:/67531/metadc696425/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.