Development of Alkaline Oxidative Dissolution Methods for Chromium (III) Compounds Present in Hanford Site Tank Sludges

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Description

The high-level radioactive waste sludge in the underground storage tanks at the Hanford Site contains various chromium(III)solid phases. Dissolution and removal of chromium from tank waste sludges is desirable prior to high-level waste vitrification because increased volume is required to incorporate the residual chromium. Unfortunately, dissolution of chromium from the sludge to form Cr(OH){sub 4}{sup {minus}} through treatment with heated NaOH solution (also used to dissolve aluminum phases and metathesize phosphates to sodium salts) generally has been unsuccessful in tests with both simulated and genuine Hanford waste sludges. Oxidative dissolution of the Cr(III) compounds to form soluble chromate has been ... continued below

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Medium: P; Size: 54 pages

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Krot, NN; Shilov, VP; Fedoseev, AM; Budantseva, NA; Nikonov, MV; Yusov, AB et al. July 2, 1999.

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Description

The high-level radioactive waste sludge in the underground storage tanks at the Hanford Site contains various chromium(III)solid phases. Dissolution and removal of chromium from tank waste sludges is desirable prior to high-level waste vitrification because increased volume is required to incorporate the residual chromium. Unfortunately, dissolution of chromium from the sludge to form Cr(OH){sub 4}{sup {minus}} through treatment with heated NaOH solution (also used to dissolve aluminum phases and metathesize phosphates to sodium salts) generally has been unsuccessful in tests with both simulated and genuine Hanford waste sludges. Oxidative dissolution of the Cr(III) compounds to form soluble chromate has been proposed as an alternative chromium solid phase dissolution method and results of limited prior testing have been reported.

Physical Description

Medium: P; Size: 54 pages

Notes

INIS; OSTI as DE00008396

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  • Other Information: PBD: 2 Jul 1999

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  • Report No.: PNNL-12209
  • Report No.: EW4010
  • Grant Number: AC06-76RL01830
  • DOI: 10.2172/8396 | External Link
  • Office of Scientific & Technical Information Report Number: 8396
  • Archival Resource Key: ark:/67531/metadc782168

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  • July 2, 1999

Added to The UNT Digital Library

  • Dec. 3, 2015, 9:30 a.m.

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  • April 6, 2016, 6:42 p.m.

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Krot, NN; Shilov, VP; Fedoseev, AM; Budantseva, NA; Nikonov, MV; Yusov, AB et al. Development of Alkaline Oxidative Dissolution Methods for Chromium (III) Compounds Present in Hanford Site Tank Sludges, report, July 2, 1999; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc782168/: accessed September 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.