Patent ID: 7798092

Claim:
An apparatus for treating a particulate material, comprising: a container having a base, an upright wall widening in an upward direction, and a deflection element adjoining said wall in an upper region of said container in order to deflect a direction of movement of said material; said wall being rotatable about a vertical axis of rotation; an opening for placing particulate material in to the container; a first air gap in an upper portion of the wall that transitions from said wall to said deflection element; and an air feed device for feeding an air stream through said first air gap into said container, at least one of said first air gap and said air feed device being configured such that said air stream introduced through said first air gap has a flow component oriented substantially in an upward direction and, in a region adjoining said air gap, oriented substantially tangentially with respect to at least one of said wall and said deflection element.