Patent US3716352A successfully refreshed from Google Patents.
US3716352A
Expired / Lapsed
US
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Sintered desulfurizer for off-furnace use
Assignee: JFE Steel Corp
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Filing: 1970-10-21
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Granted: 1973-02-13
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Expires: 1990-10-21
Abstract
Abstract A desulfurization composition for off-furnace use consisting of crushed particles of sintered material comprising 100 parts by weight of calcium oxide and 3 to 50 parts by weight, in total, of at least one compound selected from the group consisting of up to 30 parts by weight of calcium fluoride, sodium fluoride, magnesium fluoride, barium fluoride, and sodium silicofluoride, and up to 40 parts by weight, in terms of sodium carbonate, of sodium carbonate, sodium hydroxide, and sodium oxide.
Inventors
- 👤 H Ooi
- 👤 H Nakato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:40
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/04; C21C7/064
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
A granular desulfurizer composition for quickly desulfurizing pig iron in off-furnace treatment consisting of crushed particles of material sintered at a temperature of 800*-1,600* C, whereby the sulfur content is substantially reduced, comprising 100 parts by weight of calcium oxide and 3 to 50 parts by weight, in total, of at least one compound selected from the group consisting of up to 30 parts by weight of calcium fluoride, sodium fluoride, magnesium fluoride, barium fluoride, and sodium silicofluoride, and up to 40 parts by weight, in terms of sodium carbonate, of at least one compound selected From the group consisting of sodium carbonate, sodium hydroxide, and sodium oxide, the particle size of said desulfurizer composition being smaller than 4 mm and each granule of said desulfurizer composition includes calcium oxide particles of not greater than 0.3 mm diameter which are bonded by said compound, whereby the pig iron is substantially desulfurized in an off-furnace treatment.
Claim 2
Dependent Claim
155 words
A granular desulfurizer composition for quickly desulfurizing pig iron in off-furnace treatment consisting of crushed particles of material sintered at a temperature of 800*-1,600* C, whereby the sulfur content is substantially reduced, comprising 100 parts by weight of calcium oxide and 3 to 50 parts by weight, in total, of at least one compound selected from the group consisting of up to 30 parts by weight of calcium fluoride, sodium fluoride, magnesium fluoride, barium fluoride, and sodium silicofluoride, and up to 40 parts by weight, in terms of sodium carbonate, of at least one compound selected From the group consisting of sodium carbonate, sodium hydroxide, and sodium oxide, the particle size of said desulfurizer composition being smaller than 4 mm and each granule of said desulfurizer composition includes calcium oxide particles of not greater than 0.3 mm diameter which are bonded by said compound, whereby the pig iron is substantially desulfurized in an off-furnace treatment.
Claim 3
Dependent Claim
52 words
The granular desulfurizer composition according to claim 1, consisting of crushed particles of sintered material comprising 100 parts by weight of calcium oxide and 3 to 30 parts by weight of at least one compound selected from the group consisting of calcium fluoride, sodium fluoride, magnesium fluoride, barium fluoride and sodium silicofluoride.
Claim 4
Dependent Claim
53 words
The granular desulfurizer composition according to Claim 1, consisting of crushed particles of sintered material comprising 100 parts by weight of calcium oxide and 3 to 40 parts by weight, in terms of sodium carbonate, of at least one compound selected from the group consisting of sodium carbonate, sodium hydroxide, and sodium oxide.
Claim 5
Dependent Claim
105 words
The granular desulfurizer composition according to Claim 1, consisting of crushed particles of sintered material comprising 100 parts by weight of calcium oxide, and 3 to 50 parts by weight of at least two compounds, at least one of said two compounds being up to 40 parts by weight, in terms of sodium carbonate, of at least one compound selected from the group consisting of sodium carbonate, sodium hydroxide and sodium oxide, while the other one of said two compounds being selected from the group consisting of up to 30 parts by weight of calcium fluoride, sodium fluoride, magnesium fluoride, barium fluoride, and sodium silicofluoride.
Claim 6
Dependent Claim
43 words
A granular desulfurizer composition for quickly desulfurizing pig iron in off-furnace treatment according to claim 1, characterized in that said sintered material comprises a binding amount of a binder selected from the group consisting of sodium dihydrogen phosphate, calcium chloride, starch, and clay.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-13 | 1976-08-14 | 1977-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-13 | 1980-08-14 | 1981-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-13 | 1984-08-14 | 1985-02-13 | $7700.00 | Window Closed / Lapsed |