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Process and composition for the immobilization of high alkaline radioactive and hazardous wastes in silicate-based glasses

  • US 8,115,044 B2
  • Filed: 03/20/2007
  • Issued: 02/14/2012
  • Est. Priority Date: 03/20/2006
  • Status: Expired due to Fees
First Claim
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1. A silicate-based glass comprising:

  • rock-forming components selected from the group consisting of SiO2, Al2O3, ZrO2, alkaline earth oxides, alkaline oxides and mixtures thereof; and

    glass-forming components selected from the group consisting of SiO2, Al2O3, ZrO2, B2O3, P2O5, TiO2, Li2O, F, alkaline earth oxides, alkaline oxides and mixtures thereof;

    said silicate-based glass consisting essentially of;

    about 1.6 to about 2.2 parts in weight percent of a combination of monovalent cation oxides (R2O) and divalent cation oxides (RO);

    about 1 part in weight percent of trivalent cation oxides (R2O3);

    about 1 to about 3 parts in weight percent of a combination of tetravalent cation oxides (RO2) and pentavalent cation oxides (R2O5); and

    wherein Na2O is present in an amount greater than 23 weight percent, Al2O3 is present in an amount greater than about 13 weight percent and less than about 20 weight percent, SiO2 is present in an amount greater than about 30 weight percent and less than about 48 weight percent, and B2O3 and other flux components are present in a total amount greater than about 9 weight percent and less than about 15 weight percent.

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