Preparation of inorganic hardenable slurry and method for solidi

Details Preparation of inorganic hardenable slurry and method for solidi Preparation of inorganic hardenable slurry and method for solidi

1993-09-17

1995-10-10

Mai, Ngoclan

Hazardous or toxic waste destruction or containment

Destruction or containment of radioactive waste

By fixation in stable solid media

588 4, 588252, 106628, 106717, 106782, 106815, G21F 900

Patent

active

054572622

ABSTRACT:
The present invention discloses a method for preparing the inorganic hardenable slurry and the use of same in the solidification of wastes. In addition to water, the essential parts of the slurry are inorganic components including borates, cement-base powder and other additives such as magnesium oxide, gypsum and silica. The slurry is low in viscosity before solidification and flows freely,and within approximately 30 minutes after preparation the slurry becomes hardened into a highly solidified substance. The solidification of the slurry is resulted mainly from reaction of borates and the cement-base powder and to obtain a best result the weight of borates must be the same as that of the cement-base powder or even higher than the weight of the latter. The solidification mechanism differs entirely from the simple hydration reaction that brings about solidification of cement.
The present invention also teaches a method for solidifying wastes with this hardenable slurry, i.e. to proceed solidification by admixing the various radioactive or non-radioactive dry and wet wastes with the hardenable slurry, or by burying waste pellets with the slurry. The solidified waste form thus obtained has a higher strength and the volume efficiency of the solidification is 2.5 to 10 times that of the conventional cement solidification. When applied to the solidification of low level radioactive wastes, the present method produces especially a tremendous economic efficiency.

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