Patent ID: 7748653

Claim:
A method for treating materials or material mixtures in an apparatus which comprises a treatment apparatus operating on the principle of a double-action impact mill which comprises a housing with a feed opening, and at least one discharge opening, a first rotor fitted inside the housing, equipped with blades having impact surfaces wherein said blades form one or several coaxial rings with said rotor, and a stator, which is coaxial with the first rotor, or a second rotor, coaxial with the first rotor, fitted inside the housing, wherein said stator or the second rotor are equipped with blades having impact surfaces wherein said blades form one or several coaxial rings with said stator or the second rotor, wherein said rings are staggered with the ring or rings of the first rotor, and wherein said discharge opening is in association with an outermost ring, and a discharge conveyor, and wherein said method includes the following steps feeding material to be treated through the feed opening, into a hub of the treatment apparatus, formed of ring blades, from where the material to be treated is transported by the effect of the rotor or rotors, through the rings formed by said blades, to said outermost ring, and is discharged from the treatment apparatus through said discharge opening located in the housing at a location where the collision speed of the ring blades with the material is highest, and transporting the material discharged from the housing by said discharge conveyor, wherein from the material exiting from the outermost ring through the discharge opening, a material layer is maintained between the discharge opening and the discharge conveyor, which material layer prevents a free discharge of the material to be treated through the discharge opening from the treatment apparatus.