WO1997038142A1 - Melange desulfurant a base de carbure de calcium - Google Patents
Melange desulfurant a base de carbure de calcium Download PDFInfo
- Publication number
- WO1997038142A1 WO1997038142A1 PCT/FR1997/000592 FR9700592W WO9738142A1 WO 1997038142 A1 WO1997038142 A1 WO 1997038142A1 FR 9700592 W FR9700592 W FR 9700592W WO 9738142 A1 WO9738142 A1 WO 9738142A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- particle size
- calcium carbide
- pulverulent
- powder
- magnesium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or desulfurising
Definitions
- the invention relates to a desulfurizing mixture based on calcium carbide intended to be injected using a lance into the liquid cast iron obtained at the blast furnace before passing it to the converter.
- the Applicant has found that a desulfurizing mixture based on micronized powder of calcium carbide and containing both magnesium powder and aluminum powder, the latter in a well defined concentration range, allows a significant reduction iron losses during desulfurization.
- the subject of the invention is therefore a desulfurizing mixture of refining pig iron consisting of at least 50% (by weight) of powdered calcium carbide with a particle size ⁇ 0.2 mm, from 1 to 20% of powdered magnesium with a particle size ⁇ 0.8 mm and from 5 to 15% of aluminum powder with a particle size ⁇ 0.8 mm, with optionally other powder additives such as lime, calcium carbonate, carbonaceous products and / or coating agents in a total amount of at most 30%.
- the mixture according to the invention is based on technical calcium carbide, which generally contains around 80% by weight of C 2 Ca, the rest being lime, ground to a particle size less than 0.2 mm, with less than 25% of particles in the particle size range 0.1 - 0.2 mm
- This carbide can be added with lime in addition to that resulting from the manufacture of technical carbide, calcium carbonate, carbon products such as carbon black , graphite or anthracite, or other products intended to improve the flowability of the mixture or to release gases allowing a good distribution of the desulfurizer in the hot melt. It is also possible to add up to 2% of a binder for coating the grains, for example hydrogenated castor oil as described in patent EP 0511121 of the applicant.
- the magnesium is added to the mixture in the form of a powder or granules of pure metal or of a magnesium-based alloy with a particle size ⁇ 0.8 mm.
- the grains can also be coated, like those of calcium carbide, with an organic product, for example based on saturated aliphatic acids or their esters as described in patent EP 0485309 of the applicant.
- the mixing of the powders or granules is advantageously carried out in a mixer operating under neutral gas, for example nitrogen.
- the mixtures according to the invention have a desulfurization efficiency at least equal to that of mixtures where aluminum is replaced in equal quantity by magnesium and therefore do not cause any overconsumption of product, which is quite unexpected since aluminum, unlike magnesium, is not by itself a desulfurizer.
- a slag is formed which is more fluid, easier to clean and whose cleaning leads to much lower iron losses.
- dross does not contain any products harmful to the environment such as sodium oxide.
- the tests were carried out on pockets of 300 t of cast iron.
- the initial sulfur content was close to 250 ppm, while the final content was around 55 ppm.
- the effectiveness of a desulfurizer is defined by the ratio of the number of moles removed from the cast iron to the number of moles of desulfurizer injected, that is to say, in the present case, moles of C 2 Ca and Mg, raluminium not being in itself a desulfurizing product.
- the iron loss is defined by the ratio of the mass of pig iron contained in dross to the mass of pig iron contained in the desulfurization pocket. The following results were obtained for the 3 mixtures, which are the average of 20 tests carried out under conditions as close as possible.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
Description
Claims
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97919467A EP0891431B1 (fr) | 1996-04-04 | 1997-04-02 | Melange desulfurant a base de carbure de calcium |
| UA98115805A UA49014C2 (uk) | 1996-04-04 | 1997-04-02 | Десульфуюча суміш на основі карбіду кальцію |
| PL97329220A PL183768B1 (pl) | 1996-04-04 | 1997-04-02 | Mieszanka odsiarczająca na bazie karbidu |
| AU23928/97A AU2392897A (en) | 1996-04-04 | 1997-04-02 | Desulphurising calcium carbide blend |
| RO98-01446A RO117712B1 (ro) | 1996-04-04 | 1997-04-02 | Amestec desulfurant pe baza de carbura de calciu |
| SK1379-98A SK283419B6 (sk) | 1996-04-04 | 1997-04-02 | Odsírovacia zmes na báze karbidu vápnika |
| DE69700665T DE69700665T2 (de) | 1996-04-04 | 1997-04-02 | Entschwefelnde kalzium-karbidmischung |
| CZ19983147A CZ293175B6 (cs) | 1996-04-04 | 1997-04-02 | Odsiřovací směs na bázi karbidu vápníku |
| HU9902168A HU222767B1 (hu) | 1996-04-04 | 1997-04-02 | Kalciumkarbid-alapú kéntelenítő keverék |
| BG102700A BG63215B1 (bg) | 1996-04-04 | 1998-08-19 | Десулфурираща смес на основата на калциев карбид |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR96/04493 | 1996-04-04 | ||
| FR9604493A FR2747132B1 (fr) | 1996-04-04 | 1996-04-04 | Melange desulfurant a base de carbure de calcium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997038142A1 true WO1997038142A1 (fr) | 1997-10-16 |
Family
ID=9491082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR1997/000592 Ceased WO1997038142A1 (fr) | 1996-04-04 | 1997-04-02 | Melange desulfurant a base de carbure de calcium |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0891431B1 (fr) |
| AU (1) | AU2392897A (fr) |
| BG (1) | BG63215B1 (fr) |
| CZ (1) | CZ293175B6 (fr) |
| DE (1) | DE69700665T2 (fr) |
| ES (1) | ES2140232T3 (fr) |
| FR (1) | FR2747132B1 (fr) |
| HU (1) | HU222767B1 (fr) |
| PL (1) | PL183768B1 (fr) |
| RO (1) | RO117712B1 (fr) |
| RU (1) | RU2166548C2 (fr) |
| SK (1) | SK283419B6 (fr) |
| UA (1) | UA49014C2 (fr) |
| WO (1) | WO1997038142A1 (fr) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016004493A1 (fr) * | 2014-07-11 | 2016-01-14 | Tecnosulfur Sistema De Tratamiento De Metais Liquidos S/A. | Composition de désulfuration et son procédé de production, méthode de conditionnement et d'utilisation dans des cuves de petite taille pour la production de fontes liquides |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19857733A1 (de) * | 1998-12-15 | 2000-06-21 | Almamet Gmbh | Entschwefelungsmittel |
| FR2789697B1 (fr) * | 1999-02-12 | 2001-04-06 | Pechiney Electrometallurgie | Melange desulfurant a base de carbure de calcium et/ou de chaux |
| CN101367025B (zh) * | 2008-08-13 | 2011-07-27 | 陈宏� | 一种循环流化床锅炉钙基复合催化干法脱硫剂及其制备方法 |
| CN107245549B (zh) * | 2017-06-15 | 2018-12-18 | 王强 | 一种电解铝厂铝灰的高效利用工艺 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE418074C (de) * | 1922-03-12 | 1925-08-25 | Wilhelm Kroll Dr | Entschwefelungsmittel fuer Eisen- und Stahlbaeder |
| DE2447918A1 (de) * | 1974-10-08 | 1976-04-29 | Gammal Tarek Prof Dr Ing El | Verfahren zur desoxidation und/oder entschwefelung von eisenschmelzen durch oxidfreie caalmg(c)-legierung |
| FR2317361A1 (fr) * | 1975-07-11 | 1977-02-04 | Kloeckner Werke Ag | Procede pour desulfurer de la fonte brute |
| DE2709062A1 (de) * | 1977-03-02 | 1978-09-07 | Sueddeutsche Kalkstickstoff | Mittel und verfahren zur entschwefelung von eisenschmelzen |
| JPS54136516A (en) * | 1978-04-14 | 1979-10-23 | Kobe Steel Ltd | Hot iron desulfurizing agent |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3929464A (en) * | 1973-08-31 | 1975-12-30 | Union Carbide Corp | Desulfurization of molten ferrous metals |
| SU466280A1 (ru) * | 1974-01-09 | 1975-04-05 | Донецкий Научно-Исследовательский Институ Черной Металлургии | Способ десульфурации чугуна |
| SU532633A1 (ru) * | 1975-07-09 | 1976-10-25 | Грузинский Ордена Ленина И Трудового Красного Знамени Политехничнский Институт Имени В.И.Ленина | Смесь дл десульфурации чугуна и стали |
| DE2716457C2 (de) * | 1977-04-14 | 1985-11-21 | Skw Trostberg Ag, 8223 Trostberg | Verfahren zum Einblasen von Entschwefelungsgemischen in Eisenschmelzen |
| DE2934193A1 (de) * | 1979-08-23 | 1981-03-26 | Denki Kagaku Kogyo K.K., Tokio/Tokyo | Mittel zur entschwefelung von geschmolzenem eisen. |
| US4462823A (en) * | 1982-12-11 | 1984-07-31 | Foseco International Limited | Treatment agents for molten steel |
| CA1240842A (fr) * | 1984-05-16 | 1988-08-23 | Heinrich Rellermeyer | Methode et composition de desulfuration de la fonte grise en fusion |
| DE3908071A1 (de) * | 1989-03-13 | 1990-09-20 | Hoechst Ag | Mittel und verfahren zum entschwefeln von metallschmelzen |
| US4941914A (en) * | 1989-05-18 | 1990-07-17 | Elkem Metals Company | Desulfurization agent |
| FR2668776B1 (fr) * | 1990-11-05 | 1994-05-13 | Pechiney Electrometallurgie | Produit pour desulfuration des fontes ou aciers liquides a base de magnesium enrobe. |
-
1996
- 1996-04-04 FR FR9604493A patent/FR2747132B1/fr not_active Expired - Fee Related
-
1997
- 1997-04-02 ES ES97919467T patent/ES2140232T3/es not_active Expired - Lifetime
- 1997-04-02 DE DE69700665T patent/DE69700665T2/de not_active Expired - Fee Related
- 1997-04-02 RO RO98-01446A patent/RO117712B1/ro unknown
- 1997-04-02 CZ CZ19983147A patent/CZ293175B6/cs not_active IP Right Cessation
- 1997-04-02 AU AU23928/97A patent/AU2392897A/en not_active Abandoned
- 1997-04-02 PL PL97329220A patent/PL183768B1/pl not_active IP Right Cessation
- 1997-04-02 EP EP97919467A patent/EP0891431B1/fr not_active Expired - Lifetime
- 1997-04-02 WO PCT/FR1997/000592 patent/WO1997038142A1/fr not_active Ceased
- 1997-04-02 SK SK1379-98A patent/SK283419B6/sk unknown
- 1997-04-02 UA UA98115805A patent/UA49014C2/uk unknown
- 1997-04-02 RU RU98119951/02A patent/RU2166548C2/ru not_active IP Right Cessation
- 1997-04-02 HU HU9902168A patent/HU222767B1/hu not_active IP Right Cessation
-
1998
- 1998-08-19 BG BG102700A patent/BG63215B1/bg unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE418074C (de) * | 1922-03-12 | 1925-08-25 | Wilhelm Kroll Dr | Entschwefelungsmittel fuer Eisen- und Stahlbaeder |
| DE2447918A1 (de) * | 1974-10-08 | 1976-04-29 | Gammal Tarek Prof Dr Ing El | Verfahren zur desoxidation und/oder entschwefelung von eisenschmelzen durch oxidfreie caalmg(c)-legierung |
| FR2317361A1 (fr) * | 1975-07-11 | 1977-02-04 | Kloeckner Werke Ag | Procede pour desulfurer de la fonte brute |
| DE2709062A1 (de) * | 1977-03-02 | 1978-09-07 | Sueddeutsche Kalkstickstoff | Mittel und verfahren zur entschwefelung von eisenschmelzen |
| JPS54136516A (en) * | 1978-04-14 | 1979-10-23 | Kobe Steel Ltd | Hot iron desulfurizing agent |
Non-Patent Citations (1)
| Title |
|---|
| PATENT ABSTRACTS OF JAPAN vol. 004, no. 002 (C - 069) 9 January 1980 (1980-01-09) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016004493A1 (fr) * | 2014-07-11 | 2016-01-14 | Tecnosulfur Sistema De Tratamiento De Metais Liquidos S/A. | Composition de désulfuration et son procédé de production, méthode de conditionnement et d'utilisation dans des cuves de petite taille pour la production de fontes liquides |
Also Published As
| Publication number | Publication date |
|---|---|
| DE69700665D1 (de) | 1999-11-25 |
| HU222767B1 (hu) | 2003-10-28 |
| EP0891431A1 (fr) | 1999-01-20 |
| AU2392897A (en) | 1997-10-29 |
| SK283419B6 (sk) | 2003-07-01 |
| EP0891431B1 (fr) | 1999-10-20 |
| FR2747132A1 (fr) | 1997-10-10 |
| CZ293175B6 (cs) | 2004-02-18 |
| HUP9902168A2 (hu) | 1999-11-29 |
| PL329220A1 (en) | 1999-03-15 |
| RU2166548C2 (ru) | 2001-05-10 |
| RO117712B1 (ro) | 2002-06-28 |
| FR2747132B1 (fr) | 1998-06-19 |
| CZ314798A3 (cs) | 1999-08-11 |
| SK137998A3 (en) | 1999-05-07 |
| DE69700665T2 (de) | 2000-05-11 |
| BG102700A (en) | 1999-03-31 |
| UA49014C2 (uk) | 2002-09-16 |
| PL183768B1 (pl) | 2002-07-31 |
| ES2140232T3 (es) | 2000-02-16 |
| BG63215B1 (bg) | 2001-06-29 |
| HUP9902168A3 (en) | 2001-11-28 |
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