A device for mixing gas bubbles into a fiber suspension in order to enable the floatation to remove impurities from the fiber suspension

摘要

PCT No. PCT/SE84/00305 Sec. 371 Date May 28, 1985 Sec. 102(e) Date May 28, 1985 PCT Filed Sep. 21, 1984 PCT Pub. No. WO85/01888 PCT Pub. Date May 9, 1985.Apparatus for the mixing of gas bubbles into fiber suspensions in order to remove impurities from the fiber suspension by means of flotation is disclosed, including an inlet, an outlet including diverging upper and lower walls, an intermediate mixing section including upper and lower wall surfaces and a wing suspended between them in order to create upper and lower passages in the intermediate mixing section, the wing including an initial diverging portion, a central portion and a subsequent converging portion so that the central portion has a maximum thickness corresponding to the minimum transverse dimension for the upper and lower passages, the converging portion of the wing corresponding with the diverging upper and lower wall portions of the outlet so that the upper and lower passages diverge substantially symmetrically in the direction of flow, and an aperture for injecting a gas such as air at a location corresponding to the central portion of the wing.