WO1997038142A1 - 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
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
Application number
PCT/FR1997/000592
Other languages
English (en)
French (fr)
Inventor
Gilles Nussbaum
Original Assignee
Pechiney Electrometallurgie
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 filed Critical Pechiney Electrometallurgie
Priority to DE69700665T priority Critical patent/DE69700665T2/de
Priority to AU23928/97A priority patent/AU2392897A/en
Priority to UA98115805A priority patent/UA49014C2/uk
Priority to RO98-01446A priority patent/RO117712B1/ro
Priority to CZ19983147A priority patent/CZ293175B6/cs
Priority to PL97329220A priority patent/PL183768B1/pl
Priority to EP97919467A priority patent/EP0891431B1/fr
Priority to HU9902168A priority patent/HU222767B1/hu
Priority to SK1379-98A priority patent/SK283419B6/sk
Publication of WO1997038142A1 publication Critical patent/WO1997038142A1/fr
Priority to BG102700A priority patent/BG63215B1/bg

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)
PCT/FR1997/000592 1996-04-04 1997-04-02 Melange desulfurant a base de carbure de calcium WO1997038142A1 (fr)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DE69700665T DE69700665T2 (de) 1996-04-04 1997-04-02 Entschwefelnde kalzium-karbidmischung
AU23928/97A AU2392897A (en) 1996-04-04 1997-04-02 Desulphurising calcium carbide blend
UA98115805A UA49014C2 (uk) 1996-04-04 1997-04-02 Десульфуюча суміш на основі карбіду кальцію
RO98-01446A RO117712B1 (ro) 1996-04-04 1997-04-02 Amestec desulfurant pe baza de carbura de calciu
CZ19983147A CZ293175B6 (cs) 1996-04-04 1997-04-02 Odsiřovací směs na bázi karbidu vápníku
PL97329220A PL183768B1 (pl) 1996-04-04 1997-04-02 Mieszanka odsiarczająca na bazie karbidu
EP97919467A EP0891431B1 (fr) 1996-04-04 1997-04-02 Melange desulfurant a base de carbure de calcium
HU9902168A HU222767B1 (hu) 1996-04-04 1997-04-02 Kalciumkarbid-alapú kéntelenítő keverék
SK1379-98A SK283419B6 (sk) 1996-04-04 1997-04-02 Odsírovacia zmes na báze karbidu vápnika
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
FR9604493A FR2747132B1 (fr) 1996-04-04 1996-04-04 Melange desulfurant a base de carbure de calcium
FR96/04493 1996-04-04

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 WO1997038142A1 (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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016004493A1 (pt) * 2014-07-11 2016-01-14 Tecnosulfur Sistema De Tratamiento 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

Families Citing this family (4)

* 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
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)

* 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
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)

* Cited by examiner, † Cited by third party
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 (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.

Patent Citations (5)

* 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
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)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 004, no. 002 (C - 069) 9 January 1980 (1980-01-09) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016004493A1 (pt) * 2014-07-11 2016-01-14 Tecnosulfur Sistema De Tratamiento 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

Also Published As

Publication number Publication date
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
EP0891431B1 (fr) 1999-10-20

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