Grinding process and a continuous high-capacity micronizing mill for its implementation
AssigneeSnamprogetti S.p.A.
InventorTarcisio Orlandi
Life of this patent
Estimating the term…
Abstract
A continuous micronizing mill for granular material consisting of a rotary drum with a high length/diameter ratio, divided by separator baffles into several grinding chambers in which grinding loads having a progressively decreasing body size are placed and in which the ratios of granular material to grinding load are different.
Claims14
A device for grinding granular material in a stream comprising:
- a) a rotary drum having a plurality of successive grinding chambers wherein said rotary drum has a length to diameter ratio of at least 5;
- b) hard solid grinding bodies located within each of the grinding chambers, wherein each grinding chamber of the rotary drum has a mixture of sizes of said grinding bodies, wherein said mixture of sizes comprises a mean particle size and wherein said mean particle size of said grinding bodies progressively decreases from one grinding chamber to another successive downstream grinding chamber;
- and
- c) a baffle wall within and connected to the rotary drum for separating the grinding chambers from one another, wherein said baffle wall comprises:
- 1) a first traverse wall connected to the rotary drum having an intermediate circular band of slots therethrough;
- 2) a second traverse wall having a central aperture and connected to the rotary drum, wherein said second wall is located downstream of said first wall;
- 3) transfer blades connected to said first and second walls and positions therebetween for moving the material through and within said baffle wall;
- and
- 4) a flared solid connected to said first and second walls and positioned therebetween, wherein said flared solid is coaxial with said central aperture of said second wall so that when the granular material is fed to the device, the granular material is ground in each successive grinding chamber by said grinding bodies and passed from each successive downstream grinding chambers through said baffle walls.
A device for grinding coal in a stream by a continuous cylindrical multicompartment grinding mill comprising a rotary drum divided into successive grinding compartments and separatory baffles separating each of said grinding compartments from the next successive compartment wherein each of said grinding compartments communicate with the next successive compartment through a central aperture;
- and an open frustoconical body positioned within said central aperture, wherein two adjacent grinding compartments contain grinding bodies of at least two different sizes and the last grinding compartment of said successive grinding compartments contains grinding bodies of the same size of about 15-30 mm in diameter, and wherein said separatory baffles comprise an upstream centrally perforated wall and a downstream perforated wall parallel said upstream wall and wherein said upstream wall has a plurality of perforations for providing supplementary communication between two adjacent grinding compartments;
- and wherein said separatory baffles further comprise a set of blades secured at one end to the peripheral wall of the mill and positioned within the grinding compartment.
Dependencies are inferred from the claim text.