EP0891431B1 - Melange desulfurant a base de carbure de calcium - Google Patents

Melange desulfurant a base de carbure de calcium Download PDF

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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
Application number
EP97919467A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0891431A1 (fr
Inventor
Gilles Nussbaum
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKW BELLEGARDE Sas
Original Assignee
Pechiney Electrometallurgie SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pechiney Electrometallurgie SAS filed Critical Pechiney Electrometallurgie SAS
Publication of EP0891431A1 publication Critical patent/EP0891431A1/fr
Application granted granted Critical
Publication of EP0891431B1 publication Critical patent/EP0891431B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.

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)
EP97919467A 1996-04-04 1997-04-02 Melange desulfurant a base de carbure de calcium Expired - Lifetime EP0891431B1 (fr)

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 (cs)
AU (1) AU2392897A (cs)
BG (1) BG63215B1 (cs)
CZ (1) CZ293175B6 (cs)
DE (1) DE69700665T2 (cs)
ES (1) ES2140232T3 (cs)
FR (1) FR2747132B1 (cs)
HU (1) HU222767B1 (cs)
PL (1) PL183768B1 (cs)
RO (1) RO117712B1 (cs)
RU (1) RU2166548C2 (cs)
SK (1) SK283419B6 (cs)
UA (1) UA49014C2 (cs)
WO (1) WO1997038142A1 (cs)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
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 (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE418074C (de) * 1922-03-12 1925-08-25 Wilhelm Kroll Dr Entschwefelungsmittel fuer Eisen- und Stahlbaeder
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
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
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
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
DE2716457C2 (de) * 1977-04-14 1985-11-21 Skw Trostberg Ag, 8223 Trostberg Verfahren zum Einblasen von Entschwefelungsgemischen in Eisenschmelzen
JPS54136516A (en) * 1978-04-14 1979-10-23 Kobe Steel Ltd Hot iron desulfurizing agent
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 (en) * 1984-05-16 1988-08-23 Heinrich Rellermeyer Method, process and composition for desulfurizing pig-iron melts
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.

Also Published As

Publication number Publication date
WO1997038142A1 (fr) 1997-10-16
ES2140232T3 (es) 2000-02-16
DE69700665D1 (de) 1999-11-25
DE69700665T2 (de) 2000-05-11
SK283419B6 (sk) 2003-07-01
HUP9902168A3 (en) 2001-11-28
PL329220A1 (en) 1999-03-15
HU222767B1 (hu) 2003-10-28
PL183768B1 (pl) 2002-07-31
EP0891431A1 (fr) 1999-01-20
UA49014C2 (uk) 2002-09-16
SK137998A3 (en) 1999-05-07
RU2166548C2 (ru) 2001-05-10
CZ314798A3 (cs) 1999-08-11
HUP9902168A2 (hu) 1999-11-29
BG102700A (en) 1999-03-31
FR2747132A1 (fr) 1997-10-10
BG63215B1 (bg) 2001-06-29
AU2392897A (en) 1997-10-29
CZ293175B6 (cs) 2004-02-18
RO117712B1 (ro) 2002-06-28
FR2747132B1 (fr) 1998-06-19

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