US4076522A
Expired / Lapsed
US
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Method for the desulfurization of molten iron
Assignee: Aikoh Co Ltd
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Filing: 1976-07-22
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Granted: 1978-02-28
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Expires: 1996-07-22
Abstract
Abstract A method for the desulfurization of molten iron comprising blowing into the molten iron, together with an inert gas, fine particles or powder of magnesium, which are coated with fine particles or powder of at least one selected from the group consisting of magnesia, zirconia, titania, graphite, coke, charcoal, fluorite and magnesium fluoride.
Inventors
- 👤 Hiroshi Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:24
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
A method for the desulfurization of molten iron comprising blowing into the molten iron, together with an inert gas, magnesium particles in an amount sufficient to reduce the sulfur content of said molten iron, said magnesium particles having a particle size of less than 2 mm. and being coated with fine particles having a particle size of less than 0.15 mm. which are selected from the group consisting of magnesia, zirconia, titania, graphite, coke, charcoal, fluorspar, magnesium fluoride and mixtures thereof.
Claim 2
Independent Claim
81 words
A method for the desulfurization of molten iron comprising blowing into the molten iron, together with an inert gas, magnesium particles in an amount sufficient to reduce the sulfur content of said molten iron, said magnesium particles having a particle size of less than 2 mm. and being coated with fine particles having a particle size of less than 0.15 mm. which are selected from the group consisting of magnesia, zirconia, titania, graphite, coke, charcoal, fluorspar, magnesium fluoride and mixtures thereof.
Claim 3
Dependent Claim
23 words
A method according to claim 1 in which said fine particles are bonded to said magnesium particles by means of an organic binder.
Claim 4
Dependent Claim
54 words
A method according to claim 2 in which the organic binder consists of at least one material selected from the group consisting of starch, dextrin, molasses, glue, casein, gluten, alubumin, methyl cellulose, carboxymethylcellulose, phenol resin, urea resin, melamine resin, furan resin, epoxy resin, polyester resin, vinyl chloride, vinyl acetate, polyvinyl alcohol, pitch and tar.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |