Grinding mill
AssigneeEDI Rail PTY Limited
InventorChristopher George Kelsey
Life of this patent
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Abstract
A grinding mill has a rotating container (40) into which particulate material is fed. The container is rotated above critical speed to form a layer which is retained under high pressure against the container inner surface. Shearing discs (58) mounted inside the container induce shearing of the layer to promote particle fracture by shearing and abrasion in the pressurized layer. Fine ground material travels axially to the container discharge end (64). In one form of the invention, the container is rotated at sufficient speed to form a series of solidified zones (70) alternated with stirred zones (72) next to non-rotating shearing discs (58). These solidified zones act as solid discs rotating with the container.
Claims28
A grinding mill for particulate material, including a rotary container having an inner surface a feed inlet for feeding the particulate material to the container, a rotary drive rotating the container at sufficiently high speed that the particulate material forms a layer retained against the inner surface throughout its rotation, and a shear inducing member contacting said layer so as to induce shearing in said layer, said shear inducing member including one or more radial members extending into the particulate layer, wherein the rotary drive is adapted to rotate the container at a sufficiently high speed to cause one or more substantially solidified zones in particulate material layer.
A method of grinding particulate material, including feeding the particulate material to container which has an inner surface, rotating the container at a sufficiently high speed that the particulate material forms a layer retained against the inner surface throughout its rotation, and contacting the layer with a shear inducing member to induce shear in said layer, wherein the container is rotated at a sufficiently high speed to cause one or more substantially solidified zones in the particulate material layer.
A grinding mill for particulate material, including a rotary container having an inner surface, feed inlet for feeding the particulate material to the container, a rotary drive rotating container at sufficiently high speed that the particulate material forms a layer retained against the inner surface throughout its rotation, a shear inducing member contacting said layer so to induce shearing in said layer, said shear inducing member including one or more radial members extending into the particulate layer, wherein said shear inducing member is non-rotational.
A method of grinding particulate material, including feeding the particulate material to a container which has an inner surface, rotating the container at sufficiently high speed that the particulate material forms a layer retained against the inner surface throughout its rotation, an contacting the layer with a shear inducing member to induce shear in said layer, wherein said shear inducing member includes one or more radial members extending into the particulate material layer, wherein said shear inducing member is non-rotational.
Dependencies are inferred from the claim text.