US3572671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous degassing of metals
Assignee: Conzinc Riotinto of Australia Ltd
•
Filing: 1968-10-01
•
Granted: 1971-03-30
•
Expires: 1988-10-01
Abstract
Abstract Method for continuously and simultaneously degassing, deoxidizing or desulfurizing of molten metallic material by flowing the material into a removable bell jarlike chamber placed over a dishlike refractory tank bottom while keeping the chamber under reduced pressure and then upwardly over a baffle projecting up into the chamber and electroinductively stirring the upper part of the material in the chamber and flowing it in degassed condition downward and out of the chamber by gravity. The degassing apparatus is a removable bell jarlike chamber placed over a dishlike refractory tank with an upwardly directed baffle to deflect the crossflow of molten metal, the chamber having an inlet and an outlet aperture on opposite sides of the lower rim and external electroinductive stirring coils around its midportion the roof of the chamber is provided with a vacuum line.
Inventors
- 👤 Howard Knox Worner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:38
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; C22; C22B; C22B9/00; C22B9/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
24 words
Apparatus according to claim 1 wherein the means for inductively stirring the molten metal comprises an induction coil located externally of the degassing chamber.
Claim 2
Dependent Claim
16 words
Apparatus according to claim 2 wherein the induction coil is located above the tank or vessel.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 2 wherein a heat shield is disposed between the induction coil and the molten metal in the tank or vessel.
Claim 4
Dependent Claim
35 words
Apparatus according to any one of claim 1 and having a transverse diversion member in the lower part of the degassing chamber which diverts the molten metal upwardly and then downwardly in the degassing chamber.
Claim 5
Dependent Claim
30 words
Apparatus according to claim 5 wherein the inductive stirring of the molten metal is substantially effected in the part of the degassing chamber which is above the transverse diversion member.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 5 wherein the transverse diversion member is approximately of wedge shape in cross section.
Claim 7
Dependent Claim
53 words
Apparatus according to anyone of claim 1 and having an annulus region between the readily removable bell jarlike degassing chamber and the wall of the tank or vessel, the said annulus region being divided into an inlet section and an outlet section by transverse partitions located on opposite sides of the degassing chamber.
Claim 8
Dependent Claim
54 words
Apparatus according to claim 8 wherein metal to be degassed flows continuously into the inlet section of the annulus region and from said inlet section through an inlet opening into the degassing chamber, and degassEd metal flows continuously from the degassing chamber through an outlet opening into the outlet section of the annulus region.
Claim 9
Dependent Claim
61 words
Apparatus according to claim 8 wherein the metal to be degassed flows from an inlet launder or channel into the inlet section of the annulus region, and the degassed metal flows from the outlet section of the annulus region to an outlet launder or channel, the outlet launder or channel being at a lower level than the inlet launder or channel.
Claim 10
Dependent Claim
81 words
Apparatus according to claim 8 wherein the metal to be degassed flows from an inlet launder or channel into the inlet section of the annulus region, and the degassed metal flows from the outlet section of the annulus region to an outlet launder or channel, the outlet launder or channel being at a lower level than the inlet launder or channel, and having means for maintaining an inert atmosphere in contact with the degassed metal in the outlet launder or channel.
Claim 11
Dependent Claim
17 words
Apparatus according to claim 1 and having means for introducing solid additive materials into the degassing chamber.
Claim 12
Dependent Claim
23 words
Apparatus according to claim 1 and having means for introducing additives in gaseous or vapor form into the inlet side of the tank.
Claim 13
Dependent Claim
25 words
Apparatus according to claim 1 and having means for maintaining an inert atmosphere in contact with the degassed metal in the outlet launder or channel.
References Cited (Backward Citations)
US598037A
Cited
CA702588A
Cited
US2587793A
Cited
US3212767A
Cited
US3050798A
Cited
US3179512A
Cited
US3452973A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |