Criteria determining the selection of slags for the melt decontamination of radioactively contaminated stainless steel by electroslag remelting

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Electroslag remelting is an excellent process choice for the melt decontamination of radioactively contaminated metals. ESR furnaces are easily enclosed and do not make use of refractories which could complicate thermochemical interactions between molten metal and slag. A variety of cleaning mechanisms are active during melting; radionuclides may be partitioned to the slag by means of thermochemical reaction, electrochemical reaction, or mechanical entrapment. At the completion of melting, the slag is removed from the furnace in solid form. The electroslag process as a whole is greatly affected by the chemical and physical properties of the slag used. When used as ... continued below

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16 p.

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Buckentin, J.M.R.; Damkroger, B.K.; Shelmidine, G.J. & Atteridge, D.G. March 1, 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Electroslag remelting is an excellent process choice for the melt decontamination of radioactively contaminated metals. ESR furnaces are easily enclosed and do not make use of refractories which could complicate thermochemical interactions between molten metal and slag. A variety of cleaning mechanisms are active during melting; radionuclides may be partitioned to the slag by means of thermochemical reaction, electrochemical reaction, or mechanical entrapment. At the completion of melting, the slag is removed from the furnace in solid form. The electroslag process as a whole is greatly affected by the chemical and physical properties of the slag used. When used as a melt decontamination scheme, the ESR process may be optimized by selection of the slag. In this research, stainless steel bars were coated with non-radioactive surrogate elements in order to simulate surface contamination. These bars were electroslag remelted using slags of various chemistries. The slags investigated were ternary mixtures of calcium fluoride, calcium oxide, and alumina. The final chemistries of the stainless steel ingots were compared with those predicted by the use of a Free Energy Minimization Modeling technique. Modeling also provided insight into the chemical mechanisms by which certain elements are captured by a slag. Slag selection was also shown to have an impact on the electrical efficiency of the process as well as the surface quality of the ingots produced.

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16 p.

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INIS; OSTI as DE97004131

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  • International symposium on liquid metal processing and casting, Santa Fe, NM (United States), Feb 1997

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  • Other: DE97004131
  • Report No.: SAND--97-0601C
  • Report No.: CONF-970232--6
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 453468
  • Archival Resource Key: ark:/67531/metadc683754

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  • March 1, 1997

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  • July 25, 2015, 2:21 a.m.

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  • April 14, 2016, 3:28 p.m.

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Buckentin, J.M.R.; Damkroger, B.K.; Shelmidine, G.J. & Atteridge, D.G. Criteria determining the selection of slags for the melt decontamination of radioactively contaminated stainless steel by electroslag remelting, article, March 1, 1997; Albuquerque, New Mexico. (https://digital.library.unt.edu/ark:/67531/metadc683754/: accessed July 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.