Apparatus and a method for treating particulate materials

An apparatus for producing and/or processing a particulate material, having a chamber encircled by a wall being substantially rotation-symmetrical around a vertical axis, in the bottom portion of said chamber a substantially horizontal tight disc mounted on a vertical shaft axially in the chamber, means for rotating said shaft and said disc, an annular slot between the periphery of said disc and said wall, means for pneumatically keeping said slot and an area immediately above the slot free from particulate material and for pneumatically supporting a transportation of particulate material upwards along the wall, and at least one nozzle for spraying a liquid or steam into the chamber above the disc, characterized in having at least one gas injector debouching in said chamber, said injector being located and directed to provide a gas stream inward against the axis of the chamber or the disc to promote movement of the material being treated towards the centre of the disc in the upper part of the area which during the operation of the apparatus is occupied by said material in moving state in non-fluidized condition.