Installation for the treating of a molten metal

• US 3,961,778 A
• Filed: 05/28/1974
• Issued: 06/08/1976
• Est. Priority Date: 05/30/1973
• Status: Expired due to Term

• Current Assignee: Groupement Pour Les Activities Atomiques et Advancees "Gaaa"
• Original Assignee: Groupement Pour Les Activities Atomiques et Advancees "Gaaa"
• Inventors: Carbonnel, Henri, Vaury, Pierre
• Primary Examiner(s): Andrews, M. J.
• Application Number:
  US05/473,980
• Time in Patent Office: 742 Days
• Field of Search: 75/68, 75/93 R, 266/34 T, 266/34 PP, 266/ 34 V
• US Class Current: 266/217
• CPC Class Codes: C22B 21/066 Treatment of circulating aluminium, e.g. by filtration C22B21/068 takes precedence
• CPC Class Codes: C22B 9/04 Refining by applying a vacuum
• CPC Class Codes: C22B 9/05 Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
• CPC Class Codes: F04D 7/065 for liquid metal

Abstract

Industrial treating of corrosive molten metals by a gas within molten liquid duct of a treating electromagnetic pump comprising an installation in which the input of said treating pump is connected to an ascending pump immersed in said molten metal and the output of said treating pump is connected to a degassing tank provided with a spout pouring out the treated molten metal.

Claims

1. An installation for the industrial treating of a molten metal comprising in combination:

a furnace for holding said liquid metal,

a duct mounted on said furnace and extending upwardly therefrom and formed of a refractory substance having a predetermined porosity,

a sealed metallic tube surrounding said duct, spaced therefrom and connected to a source of treatment gas under pressure,

a liquid metal ascending pump immersed in said molten metal below said duct and operatively coupled thereto for forcing under pressure molten metal through said duct for treatment by said gas, said duct being connected at its upper end to a decanting and degassing tank,

an electromagnetic treating pump mounted above said furnace and surrounding said duct for carrying the molten metal for providing a pumping force acting in opposition to that of said liquid metal ascending pump,

the capacity of said liquid metal ascending pump being such that when liquid metal is forced upwardly through said duct, a back pressure is exerted by said electromagnetic treating pump to provide turbulence and metal is discharged from said duct into said decanting and degassing tank under pressure,

and said installation further comprising a treatment gas high-discharge pump at the upper end of said decanting and degassing tank for lowering the pressure of the treatment gas within said decanting and degassing tank after gas treatment of the metal.

2. The installation for treating molten metal according to claim 1, wherein the inlet passage for feeding the molten metal of the treating pump to the decanting tank is coaxial at its input with an annular rim defining the output of the treating pump.

3. The installation for the industrial treating of a molten metal according to claim 1 wherein the immersed pump is an electromagnetic pump.

4. The installation for the industrial treating of a molten metal according to claim 3, wherein the immersed electromagnetic pump is an annular induction pump.

5. The installation for the industrial treating of a molten metal according to claim 3, wherein the treating pump is an induction pump.

6. The installation for the industrial treating of a molten metal according to claim 5, wherein the treating pump is an induction pump having two stators.

7. The installation for the industrial treating of a molten metal according to claim 5 wherein the decanting and degassing tank arranged at the out-put of the treating pump is covered with a removable sealed cowl connected to said gas high-discharge pump.

8. The installation for the industrial treating of a molten metal according to claim 7, wherein the decanting and degassing tank arranged at the output of the treating pump is provided with a spout for pouring out the treated molten metal.

9. The installation for treating molten metal according to claim 3, wherein the immersed electromagnetic pump is a conduction pump.