Patent US3721547A successfully refreshed from Google Patents.
US3721547A
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Method of fluxing and fluidizing slag in a cupola
Assignee: Cleveland Flux Co
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Filing: 1971-09-15
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Granted: 1973-03-20
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Expires: 1991-09-15
Abstract
Abstract A method of fluxing and fluidizing the slag in a cupola by adding to the charge therein a fluxing material comprising, by weight, from 30 to 60% CaO, as limestone; from 5 to 25% Al2O3 (alumina); from 20 to 50% Na2O; and from 0 to 1% SiO2. For basic and neutral operating cupolas, the flux will be used in amounts ranging from about 0.25 to 2.5% by weight, based upon the metal charge. Acid operations require somewhat less (about 0.15 to 2.0% of the metal charge). The flux serves to improve the fluidity of the slag, lower oxidation losses, remove sulfur and improve carbon pick-up of the metal without emitting gases harmful to the atmosphere.
Inventors
- 👤 J Dvorak
- 👤 J Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:37
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/08
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
29 words
The method of claim 1 further characterized in that the amount of flux employed is from 0.15 to 2.5% by weight, based upon the weight of the metal charge.
Claim 2
Dependent Claim
36 words
The method of claim 2 further characterized in that the fluxing material is comprised of from 35 to 55% CaO, from 10 to 20% Al2O3, from 30 to 40% Na2O and from 0 to 20% SiO2.
Claim 3
Dependent Claim
19 words
The method of claim 3 further characterized in that the flux is added to the furnace is agglomerated form.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |