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Abstract

Ring injectors for aerating fluids, useful for example in flotation systems, have a housing with a mixing section, in which air is added to the through-flowing fluid through an annular slot. A core is arranged in the center of the mixing section. An air-solid mix is formed in the mixing section by deposition of air bubbles on solid particles. An annular injector with a slot width (Q.sub.2) that leads into the airing chamber with a minimum opacifying speed of 2.0 m/s at the inlet of the aerating chamber, has an annex mixing and dispersing section (6) with a cross-section that remains the same until the end (12), as well as a middle piece (10) centrally arranged therein also having a constant cross-section, the length of the mixing and dispersing section (6) being 20 times the width of the annular slot (Q.sub.3). The distributing cone (2) and the middle piece (10) can be screwed together or inserted into each other. The air slot can be regulated by spacing rings (13). Screw-shaped strips (8) within the mixing and dispersing section ( 6) can generate therein a whirl. The aerating device has been tested for the flotation of mineral coal sludges.

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First Claim