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Spectroscopic Studies of Aluminosilicate Formation in Tank WasteSimulants

Published online by Cambridge University Press:  03 September 2012

Yali Su ,
Liqiong Wang ,
Bruce C. Bunker  and
Charles F. Windisch
Yali Su
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Liqiong Wang
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Bruce C. Bunker
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Charles F. Windisch
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
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Abstract

Aluminosilicates are one of the major class of species controlling thevolume of radioactive high-level waste that will be produced from futureremediation at Hanford site. Here we present studies of the phases andstructures of aluminosilicates as a function of sludge composition usingX-ray powder diffraction, solid state 27Al and 29SiNMR, and Raman spectroscopy. The results show that the content of NaNO3 in solution has significant effects on the nature of theinsoluble aluminosilicate phases produced. It was found that regardless ofthe initial Si:Al ratio, nitrate cancrinite was the main phase formed in thesolution with pH of 13.5 and 5 MNaNO3. However, at lower NaNO3 concentration with initial Si:Al ratios of 1.1, 2.2, and11.0 in the solutions, a range of aluminosilicate zeolites was produced withSi: Al ratios of 1.1, 1.3, and 1.5, respectively. Lowering the solution pHappears to promote the formation of amorphous aluminosilicates. The resultspresented here are important for the prediction of the solubility anddissolution rate of Al in tank wastes.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 465: Symposium II – Scienfific Basis for Nuclear Waste Management XX , 1996 , 465
Copyright
Copyright © Materials Research Society 1997

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References

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