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US 5,310,291 AGranted
Transport duct for abrasive materials
AssigneeAluminum Company of America
InventorsGene S. Miller, Dennis R. Raines, Joseph C. Preston
Life of this patent
Estimating the term…
Abstract
A transport duct for carrying abrasive materials, such as ceramic powders. The duct comprises an outer casing and an axially extending array of alternating ceramic and polymer segments each having an interior wall defining a passageway. The transport duct is useful for transporting streams of alumina powder to an aluminum electrolysis cell and for other uses where abrasion resistance and avoidance of internal material buildup are important.
Claims17
A transport duct comprising:
- (a) an outer casing defining an elongated, axially extending opening;
- and
- (b) an axially extending array of alternating ceramic and polymer segments in said opening, each said segments including an exterior wall adjacent said casing, an interior wall defining a passageway smaller than said opening and side walls spaced apart by less than about 1 cm in an axial direction, each said ceramic segments having at least one side wall adjacent a polymer segment and each said polymer segments having at least one side wall adjacent a ceramic segment.
A transport duct for abrasive materials, comprising:
- (a) an outer casing defining an elongated, axially extending opening;
- (b) an array of axially alternating ceramic and polymer segments in said opening, each said segments including an exterior wall facing said casing and an interior wall extending around an entire circumference of each said segments and defining a passageway smaller than said opening, each said ceramic segments having at least one side wall abutting an axially adjacent polymer segment, and each said polymer segments having a length in an axial direction of less than about 1 cm and at least one side wall abutting an axially adjacent ceramic segment.
Dependencies are inferred from the claim text.