Apparatus for the on-line treatment of degassing and filtration of aluminum and its alloys

• US 4,844,425 A
• Filed: 04/18/1988
• Issued: 07/04/1989
• Est. Priority Date: 05/19/1987
• Status: Expired due to Fees

• Current Assignee: Aluminia SPA
• Original Assignee: Alumina SPA
• Inventors: Piras, Leonardo, Lazzaro, Giuseppe
• Primary Examiner(s): McDowell, Robert
• Application Number:
  US07/182,411
• Time in Patent Office: 442 Days
• Field of Search: 266/215, 266/220, 266/229, 266/233, 75/68 R
• US Class Current: 266/215
• CPC Class Codes: C22B 21/066 Treatment of circulating aluminium, e.g. by filtration C22B21/068 takes precedence

Abstract

Apparatus for on-line degassing and filtering aluminum and its alloys, constituted by a thermally insulated container body, provided with a removable lid (2) incorporating heating means (7) for heating the metal to be processed, said container body being internally subdivided, by means of a vertical partitioning wall (11) into two chambers communicating with each other only near the bottom of the container, wherein in one of said two chambers, provided with an inlet for the liquid metal to be processed, injection means (13, 14) are provided, for injecting inert, and/or active gases, which are so located as to perform a degassing in countercurrent relatively to the entering metal stream, while at the bottom of the second chamber at least a substantially horizontal plate, or wall (12) is provided, made of a porous material, such as ceramic, graphite, or the like, which is positioned spaced apart from the bottom of the container, such to allow the metal, coming from the first chamber, to flow upwards, and pass through said porous plate, with a rising movement of laminar type.

Claims

1. An apparatus for processing molten aluminum and its alloys including on-line degassing by means of fluxing gas and the filtering of the molten aluminum and its alloys by means of a porous plate, comprising:

a hollow container body having an open top;

a removable, thermally insulated lid for covering said container top and incorporating a heating means for heating the metal to be processed;

a partitioning wall dividing said container body into a first and second chamber;

an inlet port in a wall of said container body for introducing the molten metal to be processed into said first chamber;

a discharge port in the bottom of said second chamber for the discharge of the processed metal, said partitioning wall being spaced from a bottom of said container body to define a passageway communicating between said first and second chambers;

means for introducing a fluxing gas into said first chamber for degassing the molten aluminum and its alloys; and

,

a generally horizontal filtering plate made of an inert porous material located in a portion of said partitioning wall forming a bottom of said second chamber so that the molten aluminum and its alloys flows downwardly from said first chamber into said passageway and then flows upwardly through said porous plate in a calm, non-turbulent rising movement of laminar flow into said second chamber and through said discharge port.

2. The apparatus according to claim 1, wherein said bottom of said container body under said filtering plate includes a discharge channel for the removal of the slag filtered by the filtering plate and settling on said bottom of said container body.

3. Apparatus according to claim 1, wherein said injection means for injecting inert and/or active gases comprise downwardly extending pipes, supported by said removable lid, and provided, at their bottom ends with a, gas distribution element comprised of a porous material.

4. Apparatus according to claim 1, wherein said heating means, for heating the metal under treatment, are constituted by electrical resistors which are installed on an inner surface of said removable lid of said container body.