RADIATION-SHIELDING COMPOSITION, URANIUM DIOXIDE BASED AGGREGATE AND METHOD FOR ITS PRODUCTION Russian patent published in 2008 - IPC G21F1/04 C04B14/00 

FIELD: protective means for atomic industry and radiation technology, manufacture of containers for radioactive material storage and shipment.

SUBSTANCE: heavy concrete has aggregate, coat, and depleted uranium dioxide unit, fractional composition of particles being as follows, volume percent: those measuring 5 to 10 mm, 20-50; 1.25 to 5 mm, 10-30; and 0.63 to 1.25 mm, 10-20; it also has steel or cast-iron pellet measuring 0.3 to 0.6 mm in amount of 10-20 volume percent. Uranium dioxide based aggregate includes SiO₂, TiO₂, ZrO₂, Na₂O, K₂O, CaO, MgO, Fe₂O₃, Al₂O₃, UO₂, B₂O₃ and inevitable impurities in definite proportion. Aggregate production includes preparation of uranium dioxide powders and reaction additive, mixing of components, compression of mixture obtained, crushing, sizing into fractions, and sintering of briquettes at regular cooling. Reaction additive is prepared basing on mixture of natural datolite and bentonite materials whose masses are taken in 0.5 to 0.9 ratio of first to second ones; they are sources of SiO₂, Na₂O, K₂O, CaO , MgO, Fe₂O₃, and Al₂O₃; then desired amount of TiO₂, ZrO₂, Ka₂CO₃, Na₂SiO₃ is added to mixture obtained.

EFFECT: enhanced density, strength, lambda-ray absorption characteristics of homogeneous heat-conducting and radiation-shielding composition.

1 cl, 2 dwg