TEST PROGRAM FOR ALUMINA REMOVAL AND SODIUM HYDROXIDE REGENERATION FROM HANFORD WASTE BY LITHIUM HYDROTALCITE PRECIPITATION Page: 4 of 103
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RPP-43328, Rev. 0
Lithium aluminum layered double hydroxides ("Lithium hydrotalcite", LiHT) have been proposed as
an option to reduce the amount of aluminum from the liquid waste stream of the feed to the waste
treatment plant (WTP). Aluminum is a key element in the waste stream; it controls the amount of
caustic needed to be kept in solution during the low activity waste (LAW) stream in the WTP, thus
controlling the amount of glass logs produced and the overall mission duration.
The process consists primarily of the precipitation of aluminum as lithium hydrotalcite (LiHT) using
lithium hydroxide. The LiHT reaction has been demonstrated with Hanford single-shell tank (SST)
and double-shell tank (DST) simulants and alumina and aluminosilicate gels in one-liter bench-scale
experiments. The technology readiness level (TRL) of the process is estimated to be TRL-31 as
defined by the DOE EM Technology Readiness Assessment/Technology Maturity Plan Process
Guide, March 2008.
A test program is proposed to define a multi-phased development path to raise the TRL from 3 to 6.
It is organized into three specific tasks of chemical and engineering research and development and
process demonstration. The tasks are organized in a graduated basis; from scientific research to
development of integrated pilot facilities. Specific test plans for each activity will be developed to
precisely define the purpose, methods, measurements, and precautions to perform the experiments
safely and to generate the necessary insight into the proposed treatment methods. The plan provides
sufficient information to researchers and engineers in the form of descriptions, block flow diagrams,
and mass balances to execute research and develop necessary data to support the design and
operation of pilot and full-scale facilities.
TRL-3 is defined as "analytical and experimental critical function and/or characteristic proof of concept." This readiness level was achieved
when analytical results from laboratory simulant experiments validated thermodynamic predictions of product composition, yield, and extent of
decontamination. Analytical results of these experiments are presented in RPT-3001622-000.
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TL, SAMS & D, GEINESSE. TEST PROGRAM FOR ALUMINA REMOVAL AND SODIUM HYDROXIDE REGENERATION FROM HANFORD WASTE BY LITHIUM HYDROTALCITE PRECIPITATION, report, January 28, 2011; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc836210/m1/4/: accessed January 16, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.