Descaling process
AssigneeGardner Bros. & Perrott (W.A.) Pty. Ltd.
InventorDavid J. Lloyd
Life of this patent
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Abstract
The descaling of surface of processing equipment, vessels and piping on which scale, such as that which occurs in the extraction of alumina from bauxites has formed. The surface is cleaned to ensure that it is entirely free of contaminants and then is coated with a suitable resin such as an epoxy resin which is cross linked and thermosetting. The coating may be applied in two or more layers using the same or a different resin. The final layer may be one which readily detaches from the base coating when subjected to a high pressure fluid blast.
Claims13
A method of preparing processing equipment vessels, conduits, piping and the like to facilitate descaling surfaces which are subject to the reactive effects of caustic liquors comprising cleaning the surface to remove substantially all surface contaminants, applying a coating to the surface comprised of at least a base coat which will bond with the surface and an outer coat that reacts to the preceding coat to form a bond therewith said outer coat being resistant to caustic attack and to high pressure fluid blasting, said coating being resistant to penetration by caustic liquor and providing an outer surface which is not reactive to the caustic liquor to promote the formation of scale thereon.
Dependencies are inferred from the claim text.