Patent US3985546A successfully refreshed from Google Patents.
US3985546A
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US
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Method of fluidizing acid cupola slag
Assignee: Ford Motor Co
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Filing: 1974-12-23
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Granted: 1976-10-12
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Expires: 1994-12-23
Abstract
Abstract A composition and method is disclosed for fluxing and fluidizing the slag in an acid-operated cupola, the method comprising adding to the charge therein a fluxing material effective to provide, by weight analysis of the slag, 30-42% CaO, 41-44% SiO 2 , 7-15% Al 2 O 3 , 0.5-4.0 TiO 2 , 1.6-3.2% MnO, less than 0.05% P 2 O 5 and less than 1% sulfur. A fluxing composition is disclosed which is comprised by weight percentage of the metal charge comprising, when used with a limestone or a dolomitic limestone charge: 1.5-3.5% limestone or dolomitic limestone, 0.5-1.5% FeO . Fe 2 O 3 . TiO 2 .
Inventors
- 👤 Robert Mrdjenovich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:37
CPC Classifications
C; C21; C21B; C21B11/00; C21B11/02; C21C; C21C1/00; C21C1/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
A method of fluxing and fluidizing a slag in an acid operated cupola, to produce grey cast iron by adding to the cupola charge an effective amount of fluxing composition comprising, by weight relative to the metal charge, from 1.5-3.5% limestone or dolomitic limestone and 0.5-1.5% 2Fe x O y . TiO 2 .
Claim 2
Independent Claim
54 words
A method of fluxing and fluidizing a slag in an acid operated cupola, to produce grey cast iron by adding to the cupola charge an effective amount of fluxing composition comprising, by weight relative to the metal charge, from 1.5-3.5% limestone or dolomitic limestone and 0.5-1.5% 2Fe x O y . TiO 2 .
Claim 3
Dependent Claim
44 words
The method as in claim 1, in which the fluxing composition is varied in an amount to provide a controlled reversion of the titanium compound to titanium in the resultant grey cast iron at low carbon equivalent and thereby provide a limited chill factor.
Claim 4
Dependent Claim
34 words
The method as in claim 1, in which said fluxing composition has said 2Fe x O y . TiO 2 limited in an amount to 0.5-1.1% of the total metal charge to said cupola.
Claim 5
Dependent Claim
49 words
In a method of fluxing and fluidizing a slag in an acid operated cupola as in claim 1, which further includes the addition of fused soda ash for a portion of said 2Fe x O y . TiO 2 so that the resulting slag contains 0.2-3.0% Na 2 O.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |