Actions for Nitric-glycolic flowsheet reduction

Email RIS file
Bookmark
Report an Issue

Nitric-glycolic flowsheet reduction/oxidation (redox) model for the defense waste processing facility (DWPF) [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2017.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description
63 pages : digital, PDF file
Additional Creators
United States. Department of Energy. Savannah River Site, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online

Availability

I Want It
I Want It

Finding items...

Restrictions on Access
Free-to-read Unrestricted online access
Summary
Control of the REDuction/OXidation (REDOX) state of glasses containing high concentrations of transition metals, such as High Level Waste (HLW) glasses, is critical in order to eliminate processing difficulties caused by overly reduced or overly oxidized melts. Operation of a HLW melter at Fe+2/ΣFe ratios of between 0.09 and 0.33, retains radionuclides in the melt and thus the final glass. Specifically, long-lived radioactive 99Tc species are less volatile in the reduced Tc4+ state as TcO2 than as NaTcO4 or Tc2O7, and ruthenium radionuclides in the reduced Ru4+ state are insoluble RuO2 in the melt which are not as volatile as NaRuO4 where the Ru is in the +7 oxidation state. Similarly, hazardous volatile Cr6+ occurs in oxidized melt pools as Na2CrO4 or Na2Cr2O7, while the Cr+3 state is less volatile and remains in the melt as NaCrO2 or precipitates as chrome rich spinels. The melter REDOX control balances the oxidants and reductants from the feed and from processing additives such as antifoam.
Report Numbers
E 1.99:srnl-sti--2017-00005
srnl-sti--2017-00005
Subject(s)
Note
Published through SciTech Connect.
06/14/2017.
"srnl-sti--2017-00005"
C. M. Jantzen; M. S. Williams; T. B. Edwards; C. L. Trivelpiece; W. G. Ramsey.
Funding Information
AC09-08SR22470
AC09-76SR00001
AC09-96SR18500
View MARC record | catkey: 24045324