Method and apparatus for fine comminution of granular mill feed material
AssigneeKrupp Polysius AG
InventorOtto Heinemann
Life of this patent
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Abstract
A method and apparatus for comminuting granular mill feed material wherein the material is delivered in a stream to a gap between two rotary grinding tracks which confront one another, one of which is positioned at a small angle to the other so that in response to relative rotation of such tracks the width of the gap decreases to a minimum at an initial rate of at least 1 m/s. At the minimum width of the gap the material is subjected to comminuting pressure greater than 50 MPa.
Claims10
A method of comminuting granular material comprising delivering a stream of said material to a variable thickness gap between two relatively rotating grinding surfaces and reducing the thickness of said gap at a peripheral zone to a minimum and at an initial rate of at least 1 m/s, the thickness of said gap at said zone enabling said grinding surfaces to generate on said material at said zone a pressure greater than about 50 MPa.
A method of comminuting granular material comprising delivering a stream of said material in sufficient quantity to occupy a variable thickness gap between two relatively rotatable grinding surfaces, and reducing at an initial rate of at least 1 m/s to a minimum the thickness of said gap at a peripheral zone thereof, thereby subjecting said material at said zone to a comminuting force.
Apparatus for comminuting granular material comprising a pair of confronting grinding members spaced apart a distance to form a grinding gap therebetween;
- means mounting one of said members at a shallow angle to the other for wobbling rotary movement;
- and means for rotating said one of said members for reducing at a rate at least as great as 1 m/s the width of said gap to a minimum at a peripheral zone at which granular material occupying said zone is subjected to comminuting force.
Dependencies are inferred from the claim text.