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Abstract

A method of bloating a granular material residing in that a flow of rising gases heated to a temperature of 800.degree.-1000.degree. C. is formed, and a flow of raw granular material is formed to be introduced directly into said flow of rising gases at a velocity 1.5 to 9 times the velocity of rising gases, whereafter said material is roasted to obtain completely or partially bloated granules which are carried by the flow of exit gases away from the zone of roasting. The partially bloated granules of said material are returned to the zone of roasting to roast further until they are completely bloated. A unit for carrying out this method comprises a vertical furnace for bloating the raw granular material having a chamber the walls of which in the upper portion thereof in the zone of outlet of the bloated granular material are defined by inclined planes having an angle of inclination in excess of the natural angle of repose of the material, a reflector fashioned as a dihedron, a means for feeding the raw granular material, and pockets for collecting the bloated granular material connected to a settling chamber for the bloated material to settle in.

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First Claim