Treatment of spent electropolishing solution for removal of cobalt-60

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The Irradiated Materials Examination and Testing (IMET) Facility at Oak Ridge National Laboratory electropolishes various types of irradiated metal specimens prior to examination of metallurgical and mechanical properties. The standard electropolishing solution used at IMET for most specimens consists of a 7:1 methanol/sulfuric acid mixture, with smaller amounts of a 3:1 methanol/nitric acid solution and a 10:6:1 methanol/2-butoxyethanol/perchloric acid solution also being used. Cobalt-60 is the primary source of gamma radiation in the spent solutions, with lesser amounts from manganese-54 and iron-59. A treatment method is needed to remove most of the Co-60 from these solutions to allow the waste ... continued below

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11 p.

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Taylor, P.A.; Youngblood, E.L. & Macon, R.J. February 1, 1996.

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The Irradiated Materials Examination and Testing (IMET) Facility at Oak Ridge National Laboratory electropolishes various types of irradiated metal specimens prior to examination of metallurgical and mechanical properties. The standard electropolishing solution used at IMET for most specimens consists of a 7:1 methanol/sulfuric acid mixture, with smaller amounts of a 3:1 methanol/nitric acid solution and a 10:6:1 methanol/2-butoxyethanol/perchloric acid solution also being used. Cobalt-60 is the primary source of gamma radiation in the spent solutions, with lesser amounts from manganese-54 and iron-59. A treatment method is needed to remove most of the Co-60 from these solutions to allow the waste solutions to be contact-handled for disposal. A wide range of adsorbents was tested for removing cobalt from the electropolishing solutions. No adsorbent was found that would treat full strength solution, but a complexing ion exchange resin (Chelex 100, BioRad Labs, or Amberlite IRC-718, Rohm and Haas Co.) will remove cobalt and other heavy metals from partially neutralized (pH=3) solution. A 5 wt% sodium hydroxide solution is used for pH adjustment, since more concentrated caustic caused sodium sulfate precipitates to form. Lab-scale column tests have shown that about 10 bed volumes of methanol/sulfuric acid solution, 30 bed volumes of methanol/nitric acid solution or 15 bed volumes of methanol/2-butoxyethanol/perchloric acid solution can be treated prior to initial Co-60 breakthrough.

Physical Description

11 p.

Notes

INIS; OSTI as DE96006725

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  • American Institute of Chemical Engineers (AIChE) spring meeting, New Orleans, LA (United States), 26-29 Feb 1996

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  • Other: DE96006725
  • Report No.: CONF-960271--5
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 211395
  • Archival Resource Key: ark:/67531/metadc670186

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  • February 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Jan. 21, 2016, 1:24 p.m.

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Taylor, P.A.; Youngblood, E.L. & Macon, R.J. Treatment of spent electropolishing solution for removal of cobalt-60, article, February 1, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc670186/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.