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Spectroscopic Studies of Aluminosilicate Formation in Tank Waste Simulants

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 the volume of radioactive high-level waste that will be produced from future remediation at Hanford site. Here we present studies of the phases and structures of aluminosilicates as a function of sludge composition using X-ray powder diffraction, solid state 27Al and 29Si NMR, and Raman spectroscopy. The results show that the content of NaNO3 in solution has significant effects on the nature of the insoluble aluminosilicate phases produced. It was found that regardless of the initial Si:Al ratio, nitrate cancrinite was the main phase formed in the solution with pH of 13.5 and 5 MNaNO3. However, at lower NaNO3 concentration with initial Si:Al ratios of 1.1, 2.2, and 11.0 in the solutions, a range of aluminosilicate zeolites was produced with Si: Al ratios of 1.1, 1.3, and 1.5, respectively. Lowering the solution pH appears to promote the formation of amorphous aluminosilicates. The results presented here are important for the prediction of the solubility and dissolution rate of Al in tank wastes.

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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