FIELD: metallurgy. SUBSTANCE: method includes treatment of gases with temperature higher than dew point of vapors of sulfuric acid and rhenium heptoxide by 30-80 C in Ventury tube with aqueous solutions supplied at angle of 45-90 deg. to direction of gas flow at gas flow velocity (m/s)-to-specific consumption of gases by aqueous solution flow rate (1/cu.m) of (20-50):1. EFFECT: higher efficiency. 1 tbl
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