Patent US3436346A successfully refreshed from Google Patents.
US4159906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for the desulfurization of molten metals
Assignee: Evonik Operations GmbH
•
Filing: 1977-05-18
•
Granted: 1979-07-03
•
Expires: 1997-05-18
Abstract
Abstract Molten metals, especially molten pig iron, are desulfurized by contacting them with a composition comprising calcium carbide or calcium cyanamide and an additive agent yielding water or hydrogen at the temperature of the molten metal; preferred as the additive agents are the alkali metal hydrides, polyethylene or polyamide for yielding hydrogen and hydrate of lime and alkaline earth borates for yielding water.
Inventors
- 👤 Walter Meichsner
- 👤 Heinrich Rock
- 👤 Alfred Freissmuth
- 👤 Horst Prietzel
- 👤 Heinrich Rellermeyer
- 👤 Wolfgang Ullrich
- 👤 Erich Pfluger
- 👤 Raymund Sindermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:51
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02; C21C1/025
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
78 words
Composition for the desulfurization of molten metals comprising at least one member selected from the group consisting of calcium carbide and calcium cyanamide as the desulfurizing agent present in an amount of at least 30 percent by weight and, in addition, a solid substance yielding water at desulfurization temperatures selected from the group consisting of calcium hydroxide, aluminum hydroxide, clay, perlite, kaolin, a carbohydrate, phthalic acid, glucolic acid, an organic polymer containing hydrogen and oxygen, and a polyalcohol.
Claim 2
Dependent Claim
78 words
Composition for the desulfurization of molten metals comprising at least one member selected from the group consisting of calcium carbide and calcium cyanamide as the desulfurizing agent present in an amount of at least 30 percent by weight and, in addition, a solid substance yielding water at desulfurization temperatures selected from the group consisting of calcium hydroxide, aluminum hydroxide, clay, perlite, kaolin, a carbohydrate, phthalic acid, glucolic acid, an organic polymer containing hydrogen and oxygen, and a polyalcohol.
Claim 3
Dependent Claim
30 words
Composition as claimed in claim 1, wherein said additive agent is a water-yielding solid substance present in an amount of from 1 to 60% by weight of the total composition.
Claim 4
Dependent Claim
27 words
Composition as claimed in claim 2, wherein said water-yielding solid substance is present in an amount of from 5 to 40% by weight of the total composition.
Claim 5
Dependent Claim
14 words
Composition as claimed in claim 1, wherein said hydrogen-yielding solid substance is a polyolefin.
Claim 6
Dependent Claim
14 words
Composition as claimed in claim 1, wherein said hydrogen-yielding solid substance is a polyamide.
Claim 7
Dependent Claim
14 words
Composition as claimed in claim 1, wherein said hydrogen-yielding solid substance is a polystyrene.
Claim 8
Dependent Claim
14 words
Composition as claimed in claim 1, wherein said hydrogen-yielding solid substance is a polyacrylonitrile.
Claim 9
Dependent Claim
20 words
Composition as claimed in claim 1, wherein said hydrogen-yielding solid substance is at least one of urea, guanidine and biguanidine.
Claim 10
Dependent Claim
19 words
Composition as claimed in claim 1, wherein said hydrogen-yielding solid substance is at least one of dicyandiamide and dicyandiamidine.
Claim 11
Dependent Claim
13 words
Composition as claimed in claim 1, wherein said hydrogen-yielding solid substance is melamine.
Claim 12
Dependent Claim
20 words
Composition as claimed in claim 2, wherein said water-yielding solid substance is an alkaline earth borate containing water of crystallization.
Claim 13
Dependent Claim
14 words
Composition as claimed in claim 2, wherein said water-yielding solid substance is aluminum hydroxide.
Claim 14
Dependent Claim
20 words
Composition as claimed in claim 2, wherein said water-yielding solid substance is at least one of clay, perlite and kaolin.
Claim 15
Dependent Claim
14 words
Composition as claimed in claim 2, wherein said water-yielding solid substance is a carbohydrate.
Claim 16
Dependent Claim
21 words
Composition as claimed in claim 2, wherein said water-yielding solid substance is at least one of phthalic acid and glycolic acid.
Claim 17
Dependent Claim
19 words
Composition as claimed in claim 2, wherein said water-yielding solid substance is an organic polymer containing hydrogen and oxygen.
Claim 18
Dependent Claim
16 words
Composition as claimed in claim 16, wherein said organic polymer is polyvinyl alcohol or polyvinyl acetate.
Claim 19
Dependent Claim
14 words
Composition as claimed in claim 5, wherein said water-yielding solid substance is a polyalcohol.
Claim 20
Dependent Claim
14 words
Composition as claimed in claim 1 wherein said water yielding solid substance is sorbitol.
Claim 21
Dependent Claim
28 words
Composition as claimed in claim 1, wherein said additive agent is calcium hydroxide contained in an amount of from 1 to 60% by weight of the total composition.
Claim 22
Dependent Claim
16 words
Composition as claimed in claim 20, wherein said amount is from 5 to 40% by weight.
Claim 23
Dependent Claim
28 words
Composition as claimed in claim 1, wherein said additive agent is a carbohydrate contained in an amount of from 1 to 30% by weight of the total composition.
Claim 24
Dependent Claim
34 words
Composition as claimed in claim 1 wherein said additive agent is an alkaline earth borate containing water of crystallization contained in an amount of from 1 to 50% by weight of the total composition.
Claim 25
Dependent Claim
51 words
Composition as claimed in claim 1 wherein said water yielding solid substance contains carbon-containing substances in an amount up to about 20% by weight of the total composition with calcium hydroxide, wherein the molar ratio of calcium hydroxide to the carbon contained in said carbon-containing substance is from 10.0 to 0.1.
Claim 26
Dependent Claim
27 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 30- 95% Diamide lime: 0- 49.7% Dicyandiamide: 0.3- 20% by weight of total composition.
Claim 27
Dependent Claim
27 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 30- 99.7% Calcium hydroxide: 0- 50% Dicyandiamide: 0.3- 20% by weight of total composition.
Claim 28
Dependent Claim
23 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 85- 99% Dicyandiamide: 1- 5% by weight of total composition.
Claim 29
Dependent Claim
24 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 65- 95% Calcium hydroxide: 5- 35% by weight of total composition.
Claim 30
Dependent Claim
27 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium Carbide: 30- 95% Carbon: 0- 20% Calcium hydroxide: 5- 60% by weight of total composition.
Claim 31
Dependent Claim
27 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 60- 80% Carbon: 5- 20% Calcium hydroxide: 5- 35% by weight of total composition.
Claim 32
Dependent Claim
27 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 72- 78% Carbon: 5- 7% Calcium hydroxide: 15- 23% by weight of total composition.
Claim 33
Dependent Claim
27 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium cyanamide: 60- 85% Carbon: 1- 10% Calcium hydroxide: 5- 30% by weight of total composition.
Claim 34
Dependent Claim
26 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 30- 95% Carbon: 0- 20% Colemanite: 5- 50% by weight of total composition.
Claim 35
Dependent Claim
27 words
Composision as claimed in claim 1 consisting essentially of the following: Calcium carbide: 30- 90% Diamide lime: 0- 49% Colemanite: 1- 50% by weight of total composition.
Claim 36
Dependent Claim
31 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 50- 80% Diamide lime: 10- 20% Colemanite: 5- 15% Coke dust: 1- 15% by weight of total composition.
Claim 37
Dependent Claim
28 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 50- 80% Coke dust: 5- 20% sd Colemanite: 10- 30% by weight of total composition.
Claim 38
Dependent Claim
30 words
Composition as claimed in claim 1 consisting essentially of the following: Calcium carbide: 50- 70% Diamide lime: 15- 25% Colemanite: 10- 34% Aluminum: 1- 5% by weight of total composition.
Claim 39
Dependent Claim
60 words
Method of desulfurizing a molten metal, which method comprises contacting said metal at a temperature from about 1200° to 1450° C. with a composition as claimed in claim 1 wherein said composition comprises an additive agent selected from the hydrides of other alkaline earth and alkali metals; organic polymers containing hydrogen and osygen; urea, guanidines, biguanidines; dicyandiamide, dicyandiamidine; and melamine.
Claim 40
Dependent Claim
65 words
Method of desulfurizing a molten metal, which method comprises contacting said metal at a temperature from about 1200° to 1450° C. with a composition as claimed in claim 1 wherein said composition comprises an additive agent selected from calcium hydroxide, aluminum hydroxide, alkaline earth borates containing water of crystallization, perlite, kaolin, clay, carbohydrates, glycolic acid, solid organic oxygen compounds, polyvinyl alcohol, polyvinyl acetate and sorbitol.
References Cited (Backward Citations)
US3551139A
Cited
US3716352A
Cited
US3809547A
Cited
US3827880A
Cited
US3884679A
Cited
US4049442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-02 | 1983-01-01 | 1983-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-02 | 1987-01-01 | 1987-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-02 | 1991-01-01 | 1991-07-03 | $7700.00 | Window Closed / Lapsed |