PURPOSE: To increase adsorbing and removing capacity of the titled adsorbent, by forming a heat resistant and corrosion resistant adsorbent with means of adding silver or silver nitrate to α-alumina having ≥20m2/g specific surface area and transforming a radioactive iodine to silver iodide.
CONSTITUTION: After 0.7kg calcined alumina particle and 0.3kg dried alumina gel are mixed, added with nitric acid together with 30g bentonite and sufficiently kneaded with a kneader-mixer, the obtained mixture is extruded with a die having 1mm diameter, cut and formed to spherical particles having 1W2mm diameter with a granulator. The α-alumina support having ≥20m2/g specific surface area and fine pore size ≤200 pore size is obtained by calcining the above-mentioned spherical particle at 1,100W1,400°C. The silver nitrate is adhered on the above-mentioned α-alumina support by putting the alumina support particle of 50g in the 1N nitric acid of 50cc, keeping for 15min at room temp., filtering, adding 8.2g silver nitrate/20cc H2O and drying at 100°C.
MATSUDA MASAMI
KOMORI ITARU
MIURA HIDEKAZU
