Alkaline Leaching of Key, Non-Radioactive Components from Simulants and Hanford Tank Sludge 241-S-110: Results of FY01 Studies

Rapko, Brian M. ; Vienna, John D. ; Sinkov, Serguei I. ; Kim, Jinseong ; Cisar, Alan J.

Pacific Northwest National Laboratory (U.S.)

关键词: Leaching;    Sludges;    Radioactive Waste Processing Chromium, Mercury, 241-S-110;    Hydroxides;    Hanford Tank Sludge;   

DOI  :  10.2172/860128
RP-ID  :  PNNL-14018
RP-ID  :  AC05-76RL01830
RP-ID  :  860128

美国|英语

来源: UNT Digital Library

【 摘 要 】

This study addressed three aspects in selected alkaline leaching: first, the use of oxidants persulfate, permanganate, and ferrate as selective chromium-leaching agents from washed Hanford Tank S-110 solids under varying conditions of hydroxide concentration, temperature, and time was investigated. Second, the selective dissolution of solids containing mercury(II) oxide under alkaline conditions was examined. Various compounds were studied for their effectiveness in dissolving mercury under varying conditions of time, temperature, and hydroxide concentration in the leachate. Three compounds were studied: cysteine, iodide, and diethyldithiophosphoric acid (DEDTPA). Finally, the possibility of whether an oxidant bound to an anion-exchange resin can be used to effectively oxidize chromium(III) in alkaline solutions was addressed. The experimental results remain ambiguous to date; further work is required to reach any definitive conclusions as to the effectiveness of this approach.