US3724829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the introduction of volatile additives into a melt
Assignee: Georg Fischer AG
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Filing: 1971-12-15
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Granted: 1973-04-03
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Expires: 1991-12-15
Abstract
Abstract Introduction of vaporizable additives, such as magnesium, into an iron melt in which the vaporization is initiated by a tilting movement of a treatment vessel. The vaporizable material is contained in a separate compartment which can be externally charged and which, in one position of the vessel segregates the additive from the melt, but on tilting the vessel, permits communication with the melt through openings located at different levels. The vapor bubbles formed ascend through the melt with such a size and in such a number that at least a portion of the bubbles escape from the surface of the melt. The vapor bubbles have a great surface area to provide, for example with magnesium, a yield of at least 30 percent and preferably more than 40 percent of the additive in the melt while the velocity of the ascending vapor bubbles is such as to produce a flushing action on the melt resulting in a reduction of the reaction products and residual undesirable impurities in the melt.
Inventors
- 👤 A Alt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:08
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
16 words
The vessel of claim 1, wherein said means defining said compartment are formed of refractory material.
Claim 2
Dependent Claim
21 words
The vessel of claim 2, wherein said means defining said compartment comprises clay graphite plates of 10 to 50 mm thickness.
Claim 3
Dependent Claim
38 words
The vessel of claim 1, further including a melt-opening for charging said chamber with melt and a tightly fitting cover member for said melt-opening, said cover member including at least one through passageway of 10 to 50 mm.
Claim 4
Dependent Claim
18 words
The vessel of claim 1, further including stopper means operable from outside said vessel for closing said additive-opening.
Claim 5
Dependent Claim
16 words
The vessel of claim 1, wherein said vessel is provided with a tea can-like pouring spout.
Claim 6
Dependent Claim
56 words
The vessel of claim 1, wherein said means defining said compartment includes apertures at different levels when said vessel is in said treatment position whereby the melt enters said compartment through apertures located at the lower region of said compartment and can escape from said compartment through apertures located at the upper region of said compartment.
Claim 7
Dependent Claim
43 words
The vessel of claim 7, wherein said apertures located at the lower region of said compartment have a diameter of 20 to 40 mm and said apertures located at the upper region of said compartment have a diameter of 10 to 30 mm.
Claim 8
Dependent Claim
39 words
The vessel of claim 7, wherein the entire cross-sectional area of said apertures located at the lower region of said compartment is smaller than the entire cross-sectional area of said apertures located at the upper region of said compartment.
Claim 9
Dependent Claim
176 words
A tiltable treatment vessel for the production of iron-carbon cast materials with spherical graphite through the introduction of vaporizable additives into the melt, especially pure magnesium, comprising means defining a melt-receiving main chamber for the vessel, means defining an additive-receiving compartment for the vessel, means for enabling tilting of such vessel between a filling position and a treatment position, said additive-receiving compartment being provided with a plurality of openings for flow communicating said additive-receiving compartment with said chamber, a first group of said openings providing infeed openings for permitting entry of the melt when filled into said main chamber into said additive-receiving compartment for contact with the additives contained therein to vaporize same, the remainder of said openings defining a second group of openings providing outfeed openings for discharge of the vaporized additives and the melt contained in said additive-receiving compartment inTo said main chamber, said first and second group of openings of said additive-receiving compartment being located at different elevational positions with respect to one another when the vessel is tilted into said treatment position.
Claim 10
Dependent Claim
41 words
The treatment vessel as defined in claim 10, wherein at least a portion of said openings of said second group are upwardly directed towards the upper region of said main chamber when the vessel has been tilted into its treatment position.
Claim 11
Dependent Claim
68 words
The treatment vessel as defined in claim 10, wherein said first group of openings are located at the lower region of said additive-receiving compartment and said second group of openings at the upper region of said additive-receiving compartment when the vessel has assumed its treatment position, the total cross-sectional area of said first group of openings differing from the total cross-sectional area of said second group of openings.
Claim 12
Dependent Claim
71 words
The treatment vessel as defined in claim 10, wherein said first group of openings are located at the lower region of said additive-receiving compartment and said second group of openings are located at the upper region of said additive-receiving compartment when the vessel has been tilted into its treatment position, the total cross-sectional area of said first group of openings equaling the total cross-sectional area of said second group of openings.
Claim 13
Dependent Claim
70 words
The treatment vessel as defined in claim 10, wherein said first group of openings located at the lower region of said additive-receiving compartment when the vessel assumes its treatment position possess a diameter in the range of approximately 20 to 40 mm., and wherein said second group of openings located at the upper region of the treatment compartment possess a diameter in the range of approximately 10 to 30 mm.
Claim 14
Dependent Claim
45 words
The treatment vessel as defined in claim 10, wherein said second group of openings located at the upper region of said additive-receiving compartment when the vessel has assumed its treatment position are distributively arranged over at least one-third of the base surface of the vessel.
References Cited (Backward Citations)
US2698749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |