METHOD OF PRODUCING CERAMIC BLOCK-CELLULAR FILTER-SORBENTS FOR TRAPPING GASEOUS RADIOACTIVE AND HARMFUL SUBSTANCES Russian patent published in 2013 - IPC C04B38/06 C04B35/111 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering of highly porous ceramic materials and is meant for use directly for filtering and adsorbing gaseous radioactive and harmful substances in high temperature conditions (above 1000°C) and chemically aggressive media in processes for handling gaseous radioactive wastes and spent nuclear fuel at nuclear power plants and radiochemical companies in the nuclear industry. To obtain universal ceramic filter-sorbents based on a corundum highly porous block-cellular matrix, obtained by reproducing the structure of reticulated polyurethane foam, a mixture of alumina sol and silica sol in ratio of 20:80-80:20 is deposited by repeated saturation, followed by heat treatment. After the first saturation, heat treatment is carried out at 950-1100°C, and at 500-550°C after further saturation. Total content of deposited aluminium and silicon oxides deposited is equal to 5-20 wt % of the weight of the matrix.

EFFECT: obtaining an active layer with a highly developed surface, which enables to use the obtained sorption-filter elements as supports for depositing special sorbents and selective trapping of separate components of gaseous radioactive and harmful wastes.

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