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Method of treating alpha-active nitrogenous acid solutions, containing trivalent (ferric) iron

Author: O.M. Slyunchev, D.E. Rezchikov

Reference: Patent, 27.10.2004, Ozersk patent holder: Mayak Production Association

Keywords: liquid waste, treatment, evaporation

Abstract: The invention relate to treatment of liquid radioactive wastes. The method consists of preliminary evaporation of the solution with obtainment of regenerated nitric acid and distillation residue. Then, neutralization of the distillation residue to pH1~2, and partial reduction of ferric iron, using sodium sulfite, to mixed valence state of Fe3+:Fe2+=2:1, are conducted.   

URL: http://www.findpatent.ru/patent/225/2257626.html

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