METHOD FOR RECOVERING LIQUID WASTES INCORPORATING METAL AZIDES AND HYDRONITRIC ACID Russian patent published in 2002 - IPC

FIELD: recovery of liquid wastes in chemical and radiochemical industries. SUBSTANCE: permanganates and/or bichromates, and/or alkali metal ferrites are introduced in hydronitric acid or its mixture with alkali solution in desired molar proportion to azide-ions or hydronitric acid. Solution being treated is exposed to temperature not over 30±0,5 up to complete disintegration of azide-ions or hydronitric acid, then mixed up with other alkali waste solution to pH of 7-8, and conveyed for further treatment. Such procedure makes it possible to fully disintegrate azide-ions or hydronitric acid for comprehensive range of compounds dispensing with fire- and explosion-hazard chemical agents, to reduce disintegration time by minimum two times, and to use standard process equipment for the purpose. EFFECT: facilitated procedure, enhanced safety of process. 1 tbl