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US 4,318,941 AGranted
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.
Claims8
A process for coating the particles of a particulate solid material, wherein
- (a) the particulate solid material is supplied to a supply zone on the surface of a rotating body, the surface being a surface of rotation facing towards the axis of rotation of the body and having concavity in the axial direction,
- (b) due to the acceleration imparted by the rotation of the body the particles of the solid material are caused to travel across the surface of rotation from the supply zone to a discharge zone axially remote from the supply zone,
- (c) coating material is brought into contact with the particulate solid and distributed over the surface thereof during its travel across the surface of rotation and
- (d) particles of the solid coated with coating material are discharged from the surface at the discharge zone using forces generated by the rotation of the body.
1 more element
Dependencies are inferred from the claim text.