METHOD FOR RECOVERING ALPHA-ACTIVE NITRIC ACID SOLUTIONS CONTAINING TRIVALENT IRON Russian patent published in 2005 - IPC

FIELD: recovery of liquid radioactive wastes.

SUBSTANCE: proposed method for recovering alpha-active nitric acid solution containing trivalent iron includes pre-concentration of solution being recovered by its evaporation to produce regenerated nitric acid in still bottoms, whereupon still bottoms are neutralized to pH of 1 - 2 and trivalent iron is partially recovered by sodium sulfate until valence forms ratio Fe³⁺ : Fe² = 2 : 1 is attained. This is followed by next neutralization with alkali to pH = 10 - 11. Magnetite sediment obtained after settling down is conveyed for curing. Then solution is decanted, clarified solution is magnetically separated and additionally cleaned.

EFFECT: reduced volume of secondary wastes, reduced consumption of chemical agents used for the purpose.

2 cl, 1 tbl, 1 ex