FIELD: chemistry.
SUBSTANCE: unit contains identical columns 5 and 6 of two absorption stages, which are countercurrent scrubbers designed to purify fluorine gas from the flue gas coming from the fluorine hydration tower. Absorption columns 5 and 6 of both stages are equipped with the gas-liquid separators 52 and 62 of silicofluoric acid and washing tubes 51 and 61 of silicofluoride acid dipping. In the upper parts of the gas-liquid separators 52 and 62, there are outlets 12 of the flue gas, and layers of foam are installed. The outlets of the silicofluoric acid of the absorption columns 5 and 6 are communicated with the nozzles of the washing tubes 51 and 61 by means of pipelines with circulation pumps 2. In addition, the outlet 53 of the silicofluoride acid of the second stage column 6 is communicated with the gas-liquid separator 52 of the first stage column 5. The flue gas outlet 12 of the first stage column 5 is communicated with the flushing tube 61 of the second stage column 6, and the flue gas outlet 12 of the second stage column 6 is communicated with the vacuum spray tower 7, at the top of which the flue gas outlet 12 is formed. Excesses of the silicofluoric acid solution from the first stage column 5 are fed to the unit 21 for treatment on the filter press and subsequent purification in the device 54.
EFFECT: invention provides a high degree of fluorine capture and its absence into the atmosphere.
10 cl, 5 dwg, 1 ex
