Coating of solids
AssigneeImperial Chemical Industries PLC
InventorsJohn E. Gillett, John Isherwood, Richard A. Hann, Philip Norton-Berry, Margaret L. Steel
Life of this patent
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Abstract
A process wherein solid particles are coated with either liquids or solids while the particles are moving as a uniform layer over the surface of a rotating body and subsequently discharged from the surface by centrifugal force. Two forms of coating apparatus designed to coat prills are shown, the preferred apparatus having a flexible conical disc carrying a layer of existing material which touches the rim of the rotating body from which the solid is discharged.
Claims4
A device suitable for coating particulate solid materials, comprising a body rotatable about an axis and having a surface of rotation facing towards the axis and said surface has a concavity in the axial direction, means to supply solid particulate material to a supply zone on the said surface of rotation, means to rotate the body to thereby cause the particulate material to travel across the surface of rotation from the supply zone to a discharge zone axially remote from the supply zone, a member adapted to rotate independently of the body and mounted coaxially with the said surface of rotation of the body, and means to feed coating material to a second surface being a surface on the member, the second surface being positioned adjacent to at least a part of said surface of rotation so as to contact the particulate material as the latter travels across said part of the surface of rotation to thereby transfer the coating material to the particulate material when the member is rotating.
Dependencies are inferred from the claim text.