Ducts serving for the exhaustion of dust-laden waste gases from a converter and from ancillary equipment lead to two scrubbing stations whence the purified gases escape through respective chimneys. The effluent from the main scrubbing station, serving the converter, is cleansed in a settling tank for recirculation to both scrubbing stations; the effluent from the secondary scrubbing station is fed to a preliminary stage of the main station through which it also returns to the settling tank. An annular cowl for the interception of peripherally escaping converter gases is connected to a duct normally communicating with the secondary scrubbing station; during charging of the converter, however, this duct is switched to the main scrubbing station which is then not traversed by converter gases.
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