FIELD: metallurgy.
SUBSTANCE: claimed process comprises processing of off-gases by the mix of alkaline reagent with carbamide water solution. Off-gases are subjected to two-step purification. At second step, off-gases are subjected to countercurrent processing by the mix of sodium hydroxide water solution with carbamide water solution. Note here that carbamide water solution is added to sodium hydroxide water solution in amount 20-60% exceeding stoichiometry. Obtained mix is cycled in recycling circuit the tank-pump-scrubber to residual concentration of sodium hydroxide of 20-40 g/dm3 and used solution saturated with sodium chloride is removed from said circuit.
EFFECT: lower costs and content of sodium hypochlorite and active chlorine, longer life of equipment.
3 cl, 2 ex
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