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Low melting high lithia glass compositions and methods

United States Patent

September 23, 2003
View the Complete Patent at the US Patent & Trademark Office
Savannah River National Laboratory - Visit the Technology Transfer Website
The invention relates to methods of vitrifying waste and for lowering the melting point of glass forming systems by including lithia formers in the glass forming composition in significant amounts, typically from about 0.16 wt % to about 11 wt %, based on the total glass forming oxides. The lithia is typically included as a replacement for alkali oxide glass formers that would normally be present in a particular glass forming system. Replacement can occur on a mole percent or weight percent basis, and typically results in a composition wherein lithia forms about 10 wt % to about 100 wt % of the alkali oxide glass formers present in the composition. The present invention also relates to the high lithia glass compositions formed by these methods. The invention is useful for stabilization of numerous types of waste materials, including aqueous waste uranium oxides The decrease in melting point achieved by the present invention desirably prevents volatilization of hazardous or radioactive species during vitrification.
Jantzen; Carol M. (Aiken, SC), Pickett; John B. (Aiken, SC), Cicero-Herman; Connie A. (Aiken, SC), Marra; James C. (Aiken, SC)
Westinghouse Savannah River Company, LLC (
09/ 850,777
May 8, 2001
The United States Government has rights in this invention pursuant to Contract No. DEAC0989SR18035 between the U.S. Department of Energy and Westinghouse Savannah River Company.