Method and apparatus for drying and grinding moist material
OwnerJoseph E. Doumetinventor
Life of this patent
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Abstract
Apparatus and method for drying and grinding moist raw cement or other material wherein the moist material is introduced to a grinding zone at which it is ground to produce relatively fine and relatively coarse particles which are separated and delivered to separate outlets. Hot drying gas is delivered to the path of fresh material flowing to the grinding zone to pre-dry such material, and the ground particles flowing to the respective discharge outlets are further dried by hot gas. The further dried relatively coarse particles are delivered the fresh material inlet and mixed with fresh material therein.
Claims13
A method of drying and grinding moist feed material comprising delivering fresh, moist feed material long a path in the presence of hot drying gas and through an inlet to a grinder, thereby pre-drying said material upstream of said inlet;
- grinding the pre-dried material to produce relatively fine and relatively coarse particles of said material;
- delivering the relatively fine and relatively coarse particles to separate discharge outlets;
- further drying the relatively fine and relatively coarse particles as such particles move toward the respective outlets;
- and introducing the further dried relatively coarse particles to said path upstream of said grinder.
Apparatus for drying and grinding moist feed material comprising a housing;
- means forming a grinding zone in said housing;
- a source of fresh, moist feed material;
- inlet means for delivering fresh feed material from said source to said grinding zone;
- means at said grinding zone for grinding the material delivered thereto and producing relatively fine particles and relatively coarse particles;
- separator means in said housing for transferring the relatively fine and relatively coarse particles to separate discharge outlets;
- duct means for delivering relatively coarse particles from the coarse particles discharge outlet to said inlet means upstream from said grinding zone for mixing said relatively coarse particles with fresh material in said inlet means;
- means for delivering hot gas into said inlet means upstream from said grinding zone for pre-drying fresh material prior to grinding thereof;
- and means for delivering hot gas to said separator means for drying said relatively fine and relatively coarse particles.
A method of drying and grinding moist feed material comprising delivering fresh, moist feed material along a path in the presence of hot drying gas and through an inlet to a grinder, thereby pre-drying said material upstream of said grinder;
- grinding the pre-dried material to produce relatively fine and relatively coarse particles of said material;
- delivering the relatively fine and relatively coarse particles to separate discharge outlets;
- further drying the relatively fine and relatively coarse particles as such particles move toward the respective outlets;
- introducing the further dried relatively coarse particles to said path upstream of said grinder;
- and introducing the hot drying gas to said fresh material upstream from the introduction of the relatively coarse particles to said path.
Dependencies are inferred from the claim text.