APPARATUS FOR INTRODUCING GAS INTO LIQUID METAL

• US 3,799,522 A
• Filed: 10/06/1972
• Issued: 03/26/1974
• Est. Priority Date: 10/08/1971
• Status: Expired due to Term

• Current Assignee: Malcolm Victor Brant, Michael Edwards
• Original Assignee: Malcolm Victor Brant, Michael Edwards
• Inventors: Brant, Malcolm Victor, Edwards, Michael
• Primary Examiner(s): Lake, Roy
• Assistant Examiner(s): Coan, James F.
• Application Number:
  US05/295,534
• Time in Patent Office: 536 Days
• Field of Search: 266/34T,34PP,34PT,34R 75/45,59,60
• US Class Current: 266/225
• CPC Class Codes: B22D 1/005 Injection assemblies therefor features relating to gas injection, provided on closures of the sliding gate type B22D41/42; provided on pouring nozzles B22D41/58; provided on closures of the stopper-rod type B22D41/186
• CPC Class Codes: B22D 11/117 by treating with gases B22D11/118, B22D11/119 take precedence
• CPC Class Codes: C04B 35/565 based on silicon carbide
• CPC Class Codes: C22B 21/064 using inert or reactive gases C22B21/066 and C22B21/068 take precedence
• 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: Y10S 266/905 Refractory metal-extracting means

Abstract

The invention concerns apparatus for introducing a gas into liquid metal and provides a member formed of silicon carbide or alumina bonded with a binding material comprising the oxides and silicates of zirconium, titanium or aluminium, the member having a tubular stem portion and a diffusing portion at an angle thereto between 45* and 135* and preferably 90*, the stem portion being made gas impermeable preferably by insertion of a gas feed tube coaxially sealed therein.

Claims

2. Apparatus for introducing gas into liquid metal comprising a hollow member moulded in a single piece from silicon carbide bonded with a binding material selected from the group consisting of the oxides and silicates of zirconium, titanium and aluminium, the member having a tubular stem portion made substantially gas impermeable and a diffusing portion in communication with the stem portion and extending at an angle thereto of between 45* and 135*.

3. Apparatus for introducing a gas into liquid metal comprising a hollow member moulded in a single piece from alumina bonded with a binding material selected from the group consisting of the oxides and silicates of zirconium and titanium, the binding material comprising 20 to 33 percent by weight of the whole, the member having a tubular stem portion made substantially gas impermeable and a diffusing portion in communication with the stem portion and extending at an angle thereto of between 45* and 135*.

4. AppaRatus according to claim 3 in which the hollow member is substantially L-shaped.

5. Apparatus for introducing a gas into liquid metal comprising a hollow member of porous refractory material having a hollow stem portion in communication with a diffusing portion extending at an angle to the stem of between 45* and 135*, a hollow impermeable, gas feed tube disposed coaxially within the stem portion and a heat resisting material compressed between the tube and the refractory stem portion, so as to prevent access of gas between the tube and the stem portion, the refractory material being selected from silicon carbide and alumina bonded with a binding material selected from the group consisting of the oxides and silicates of zirconium, titanium and aluminium.

6. Apparatus according to claim 5 in which the tube has lower flange means at its lower end and a further tubular member of larger diameter extends between the tube and the interior wall of the stem portion and has upper flange means, the heat resisting material being compressed between the lower flange means and the lower end of the further tubular member and between the upper flange means and the top of the stem portion.

7. Apparatus according to claim 5 in which the heat resisting material is a refractory fibre and is compressed with a sufficient force to render it impermeable to gas at a pressure of at least 5 p.s.i.

8. Apparatus according to claim 5 in which the tube extends beyond the stem and is adapted for connection to a gas feed pipe.