EP0891431B1 - Melange desulfurant a base de carbure de calcium - Google Patents
Melange desulfurant a base de carbure de calcium Download PDFInfo
- Publication number
- EP0891431B1 EP0891431B1 EP97919467A EP97919467A EP0891431B1 EP 0891431 B1 EP0891431 B1 EP 0891431B1 EP 97919467 A EP97919467 A EP 97919467A EP 97919467 A EP97919467 A EP 97919467A EP 0891431 B1 EP0891431 B1 EP 0891431B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- powder
- calcium carbide
- particle size
- aluminum
- 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.)
- Expired - Lifetime
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 for be injected using a lance into the liquid iron obtained from the blast furnace before its passage to the converter.
- the pig iron and the slag are poured separately from the blast furnace, there remains a significant amount of slag in the pocket, of the order of 5 kg / t. Otherwise, the use of a desulphurizing product creates sulfur-rich dross which must be separate from the metal leaving for the converter. At this stage, the scrub is done mechanically, which causes metal losses by training.
- FR 1168646 patent filed by IRSID in 1957 FR 2317361 patent KLOCKNER-WERKE describes a desulfurizer based on calcium carbide powder, calcium cyanamide or lime to which 0.5 to 3.5% powder is added of aluminum or magnesium of the same particle size.
- the Applicant has found that a desulfurizing mixture based on micronized powder of calcium carbide and containing both magnesium powder and powder of aluminum, the latter in a well-defined concentration range, allowed a significant reduction in iron losses during desulfurization.
- the subject of the invention is therefore a desulfurizing mixture of refining pig iron constituted at least 50% (by weight) of powdered calcium carbide with a particle size ⁇ 0.2 mm, from 1 to 20% magnesium powder with a particle size ⁇ 0.8 mm and from 5 to 15% aluminum powder with a particle size ⁇ 0.8 mm, with possibly other powder additives such as lime, calcium carbonate, carbon 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 contains generally around 80% by weight of C2Ca, the rest being lime, ground to a particle size less than 0.2 mm, with less than 25% of particles in the range with a grain size of 0.1 - 0.2 mm.
- This carbide can be added with lime in supplement to that which results from the manufacture of technical carbide, carbonate of calcium, carbon products such as carbon black, graphite or anthracite, or other products intended to improve the flowability of the mixture or to release gas allowing a good distribution of the desulfurizer in the liquid iron.
- We can also add up to 2% of a grain coating binder, for example oil of hydrogenated castor as described in patent EP 0511121 of the applicant.
- Magnesium is added to the mixture in the form of powder or metal granules pure 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 EP 0485309 patent of the applicant.
- the mixing of the powders or granules is advantageously done 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 lead to any overconsumption of product, which is quite unexpected since aluminum, unlike magnesium, is not by itself a desulfurizer.
- aluminum unlike magnesium, is not by itself a desulfurizer.
- dross does not contain no environmentally harmful products 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, l aluminum is not in itself a desulfurizing product.
- the iron loss is defined by the ratio of the mass of cast iron contained in the dross to the mass of cast iron contained in the desulphurization pocket.
Description
Mélange | Efficacité | Perte fer |
1 | 22% | 1,1% |
2 | 18% | 0,9% |
3 | 23% | 0,3% |
Claims (2)
- Mélange désulfurant pour injection dans la fonte d'affinage liquide, constitué en poids d'au moins 50% de carbure de calcium en poudre de granulométrie < 0,2 mm, de 1 à 20% de magnésium en poudre ou granules de granulométrie < 0,8 mm et de 5 à 15% d'aluminium en poudre ou granules de granulométrie < 0,8 mm, avec éventuellement d'autres additifs en poudre tels que la chaux, le carbonate de calcium, des produits carbonés et/ou des agents d'enrobage des grains, la quantité totale d'additifs étant d'au plus 30%.
- Mélange selon la revendication 1 dans lequel moins de 25% des grains de carbure de calcium ont une granulométrie comprise entre 0,1 et 0,2 mm.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9604493A FR2747132B1 (fr) | 1996-04-04 | 1996-04-04 | Melange desulfurant a base de carbure de calcium |
FR9604493 | 1996-04-04 | ||
PCT/FR1997/000592 WO1997038142A1 (fr) | 1996-04-04 | 1997-04-02 | Melange desulfurant a base de carbure de calcium |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0891431A1 EP0891431A1 (fr) | 1999-01-20 |
EP0891431B1 true EP0891431B1 (fr) | 1999-10-20 |
Family
ID=9491082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97919467A Expired - Lifetime EP0891431B1 (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) |
Families Citing this family (5)
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 |
BR102014017197A2 (pt) * | 2014-07-11 | 2016-02-16 | Tecnosulfur Sist De Tratamento De Metais Liquidos S A | composição dessulfurante e seu processo de produção, método de acondicionamento e de aplicação em panelas de pequeno porte para produção de ferros fundidos |
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 |
Family Cites Families (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 |
DE2531047B2 (de) * | 1975-07-11 | 1978-07-06 | Kloeckner-Werke Ag, 4100 Duisburg | Verfahren zum Entschwefeln von Roheisen |
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 |
-
1996
- 1996-04-04 FR FR9604493A patent/FR2747132B1/fr not_active Expired - Fee Related
-
1997
- 1997-04-02 HU HU9902168A patent/HU222767B1/hu not_active IP Right Cessation
- 1997-04-02 RO RO98-01446A patent/RO117712B1/ro unknown
- 1997-04-02 WO PCT/FR1997/000592 patent/WO1997038142A1/fr active IP Right Grant
- 1997-04-02 EP EP97919467A patent/EP0891431B1/fr not_active Expired - Lifetime
- 1997-04-02 ES ES97919467T patent/ES2140232T3/es not_active Expired - Lifetime
- 1997-04-02 SK SK1379-98A patent/SK283419B6/sk unknown
- 1997-04-02 AU AU23928/97A patent/AU2392897A/en not_active Abandoned
- 1997-04-02 CZ CZ19983147A patent/CZ293175B6/cs not_active IP Right Cessation
- 1997-04-02 RU RU98119951/02A patent/RU2166548C2/ru not_active IP Right Cessation
- 1997-04-02 DE DE69700665T patent/DE69700665T2/de not_active Expired - Fee Related
- 1997-04-02 PL PL97329220A patent/PL183768B1/pl not_active IP Right Cessation
- 1997-04-02 UA UA98115805A patent/UA49014C2/uk unknown
-
1998
- 1998-08-19 BG BG102700A patent/BG63215B1/bg unknown
Also Published As
Publication number | Publication date |
---|---|
EP0891431A1 (fr) | 1999-01-20 |
WO1997038142A1 (fr) | 1997-10-16 |
HU222767B1 (hu) | 2003-10-28 |
HUP9902168A2 (hu) | 1999-11-29 |
HUP9902168A3 (en) | 2001-11-28 |
AU2392897A (en) | 1997-10-29 |
FR2747132A1 (fr) | 1997-10-10 |
SK137998A3 (en) | 1999-05-07 |
DE69700665D1 (de) | 1999-11-25 |
UA49014C2 (uk) | 2002-09-16 |
BG102700A (en) | 1999-03-31 |
CZ314798A3 (cs) | 1999-08-11 |
RU2166548C2 (ru) | 2001-05-10 |
BG63215B1 (bg) | 2001-06-29 |
FR2747132B1 (fr) | 1998-06-19 |
ES2140232T3 (es) | 2000-02-16 |
PL183768B1 (pl) | 2002-07-31 |
SK283419B6 (sk) | 2003-07-01 |
RO117712B1 (ro) | 2002-06-28 |
PL329220A1 (en) | 1999-03-15 |
CZ293175B6 (cs) | 2004-02-18 |
DE69700665T2 (de) | 2000-05-11 |
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