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Title: Selective Leaching of Chromium from Hanford Tank Sludge 241-U-108

Abstract

This study evaluated the oxidants permanganate, MnO4-, and peroxynitrite, ONOO-, as selective chromium-leaching agents from washed 241-U-108 tank sludge under varying conditions of hydroxide concentration, temperature, and time. The mass changes and final sludge compositions were evaluated using glass-property models to ascertain the relative impacts of the various oxidative alkaline leach conditions on the amount of borosilicate glass required to immobilize a given amount of washed 241-U-108 Hanford tank sludge. Only permanganate leaching removes sufficient chromium to make the chromium concentration in the oxidatively alkaline leached solids non-limiting. In the absence of added oxidants, continued washing or caustic leaching have no beneficial effects. Peroxynitrite addition reduces the amount of glass required to immobilize a given amount of washed 241-U-108 tank sludge by approximately a factor of two. Depending on the leach conditions and the exact chromium concentration limits, contact with alkaline permanganate solutions reduces the amount of immobilized high-level waste glass by a factor of 10 to 30.

Authors:
;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
860129
Report Number(s):
PNNL-14019
EY4049110; TRN: US0504826
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; BOROSILICATE GLASS; CHROMIUM; HYDROXIDES; LEACHING; OXIDIZERS; PERMANGANATES; SLUDGES; WASHING; HANFORD RESERVATION; RADIOACTIVE WASTE PROCESSING; chromium; oxidative alkaline leaching; permanganate; peroxynitrite; U-108

Citation Formats

Rapko, Brian M, and Vienna, John D. Selective Leaching of Chromium from Hanford Tank Sludge 241-U-108. United States: N. p., 2002. Web. doi:10.2172/860129.
Rapko, Brian M, & Vienna, John D. Selective Leaching of Chromium from Hanford Tank Sludge 241-U-108. United States. doi:10.2172/860129.
Rapko, Brian M, and Vienna, John D. Mon . "Selective Leaching of Chromium from Hanford Tank Sludge 241-U-108". United States. doi:10.2172/860129. https://www.osti.gov/servlets/purl/860129.
@article{osti_860129,
title = {Selective Leaching of Chromium from Hanford Tank Sludge 241-U-108},
author = {Rapko, Brian M and Vienna, John D},
abstractNote = {This study evaluated the oxidants permanganate, MnO4-, and peroxynitrite, ONOO-, as selective chromium-leaching agents from washed 241-U-108 tank sludge under varying conditions of hydroxide concentration, temperature, and time. The mass changes and final sludge compositions were evaluated using glass-property models to ascertain the relative impacts of the various oxidative alkaline leach conditions on the amount of borosilicate glass required to immobilize a given amount of washed 241-U-108 Hanford tank sludge. Only permanganate leaching removes sufficient chromium to make the chromium concentration in the oxidatively alkaline leached solids non-limiting. In the absence of added oxidants, continued washing or caustic leaching have no beneficial effects. Peroxynitrite addition reduces the amount of glass required to immobilize a given amount of washed 241-U-108 tank sludge by approximately a factor of two. Depending on the leach conditions and the exact chromium concentration limits, contact with alkaline permanganate solutions reduces the amount of immobilized high-level waste glass by a factor of 10 to 30.},
doi = {10.2172/860129},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {9}
}

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