Fixation by ion exchange of toxic materials in a glass matrix

Details Fixation by ion exchange of toxic materials in a glass matrix Fixation by ion exchange of toxic materials in a glass matrix

G - Physics

21

F

23/185, 362/40,

G21F 9/12 (2006.01) B01J 39/14 (2006.01) B09B 3/00 (2006.01) G21F 9/30 (2006.01)

Patent

CA 1129188

ABSTRACT OF THE DISCLOSURE This invention relates to the immobilization of toxic, e.g., radioactive, materials in a silicate glass or silica gel matrix for extremely long periods of time. Toxic materials, such as radioactive wastes containing radioactive cations, which may be in the form of liquids, or solids dissolved or dispersed in liquids or gases, are incorporated into a glass or silica gel matrix, having alkali metal, Group Ib metal and/or ammonium cations bonded to silicon atoms of said glass or silica gel through divalent oxygen linkages, by a process which involves the ion exchange of said toxic or radioactive cations with said alkali metal, Group Ib metal and/or ammonium cations to bind said toxic or radioactive cations to silicon atoms of said glass or silica gel through said silicon-bonded divalent oxygen linkages. Thereafter, the glass or silica gel is sintered to collapse the pores thereof.

339611

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