HIGHLY POROUS CERAMIC HONEYCOMB-BLOCK SORBENTS FOR RETENTION OF RADIOACTIVE IODINE AND ITS COMPOUNDS FROM THE GAS PHASE Russian patent published in 2016 - IPC C04B35/111 C04B38/06 G21F9/02 

FIELD: recycling and waste management; nucleonics.

SUBSTANCE: invention relates to the field of radioactive waste and spent nuclear fuel, and is designed to capture radioactive iodine and its compounds from the gas phase in ventilation systems and in systems of iodine purification of nuclear power plants. A highly porous ceramic honeycomb block sorbent is a porous substrate of corundum highly porous block of cellular material with a mesh size of 0.5-1.2 mm, with an open porosity of 85 to 90% and the active substrate from γ-alumina, applied in an amount of up to 6.5 wt.%, soaked sorption-active ingredient - silver nitrate - to the total content of AgNO₃, equal to 8-18 wt.%. Effect of the invention - increasing the mechanical strength during the operation and regeneration of the sorbent, its chemical and corrosion resistance in aggressive environments, an increase in surface and bulk porosity. These sorbents provide a ceramic in the temperature range studied (170-210°C) and airflow (12-600 liters / hour), the cleaning efficiency of CH₃ ¹³¹I with a concentration in the air 3.6-290 mg/m³ in the range of 99.92-99.97%, which corresponds to the requirements for iodine sorbent ratio of radioiodine treatment - not less than 10³.

EFFECT: these characteristics are highly porous ceramic honeycomb block sorbents to improve performance and reduce by several times the size of the gas cleaning devices, extend the life of the sorbents, more efficient use of expensive silver.

1 cl, 4 ex