FIELD: process engineering.
SUBSTANCE: invention relates to recovery of solid filter containing iodine as iodide and/or silver iodate and, possibly, physically sorbed molecular iodine in solid filter containing silver as nitrate. Proposed method comprises the following stages. 1. Removal of iodine from filter by its processing by base aqueous solution containing reducing agent and separation of filter from said base aqueous solution. 2. Extraction of silver from filter obtained at stage 1 by bringing said filter in contact with acid aqueous solution and separation of filter from said acid solution. 3. Impregnation of filter with silver produced at stage 2 by bringing said filter in contact with silver nitrate solution and filter drying.
EFFECT: reuse of used filters, reduced wastes.
10 cl, 3 ex
