EP0166019A1 - Procédé de désulfuration de la fonte - Google Patents

Procédé de désulfuration de la fonte Download PDF

Info

Publication number: EP0166019A1
Authority: EP; European Patent Office
Prior art keywords: blown; pig iron; lime; gas; weight
Prior art date: 1984-06-28
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.): Granted

Application number

EP84107487A

Other languages

German (de)

English (en)

Other versions

EP0166019B1 (fr

Inventor

Rudolf Dr.-Ing. Hammer

Walter Dipl.-Ing. Meichsner

Karl-Heinz Dr.-Ing. Peters

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.)

Thyssen Stahl AG

Original Assignee

Thyssen Stahl AG

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.)

1984-06-28

Filing date

1984-06-28

Publication date

1986-01-02

1984-06-28 Application filed by Thyssen Stahl AG filed Critical Thyssen Stahl AG

1984-06-28 Priority to DE8484107487T priority Critical patent/DE3474568D1/de

1984-06-28 Priority to AT84107487T priority patent/ATE37902T1/de

1984-06-28 Priority to EP84107487A priority patent/EP0166019B1/fr

1985-06-12 Priority to US06/743,854 priority patent/US4586955A/en

1985-06-27 Priority to CA000485473A priority patent/CA1239022A/fr

1985-06-27 Priority to AU44244/85A priority patent/AU570805B2/en

1985-06-28 Priority to CN85104955.9A priority patent/CN1003308B/zh

1986-01-02 Publication of EP0166019A1 publication Critical patent/EP0166019A1/fr

1988-10-12 Application granted granted Critical

1988-10-12 Publication of EP0166019B1 publication Critical patent/EP0166019B1/fr

Status Expired legal-status Critical Current

Links

238000000034 method Methods 0.000 title claims abstract description 17
229910000805 Pig iron Inorganic materials 0.000 title claims description 38
230000003009 desulfurizing effect Effects 0.000 title claims description 13
235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 26
235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 26
239000004571 lime Substances 0.000 claims abstract description 26
239000007789 gas Substances 0.000 claims abstract description 20
XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
229910052782 aluminium Inorganic materials 0.000 claims abstract description 14
239000012159 carrier gas Substances 0.000 claims abstract description 13
239000007787 solid Substances 0.000 claims abstract description 12
ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract 2
239000003795 chemical substances by application Substances 0.000 claims description 23
239000000203 mixture Substances 0.000 claims description 9
OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 4
229910052799 carbon Inorganic materials 0.000 claims description 4
239000000126 substance Substances 0.000 claims description 4
235000019738 Limestone Nutrition 0.000 claims description 3
RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 3
239000003830 anthracite Substances 0.000 claims description 3
239000010436 fluorite Substances 0.000 claims description 3
239000006028 limestone Substances 0.000 claims description 3
229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
150000001342 alkaline earth metals Chemical class 0.000 claims description 2
239000006229 carbon black Substances 0.000 claims description 2
239000010459 dolomite Substances 0.000 claims description 2
229910000514 dolomite Inorganic materials 0.000 claims description 2
239000010439 graphite Substances 0.000 claims description 2
229910002804 graphite Inorganic materials 0.000 claims description 2
239000002006 petroleum coke Substances 0.000 claims description 2
229910052751 metal Inorganic materials 0.000 abstract 3
239000002184 metal Substances 0.000 abstract 3
238000006477 desulfuration reaction Methods 0.000 description 18
230000023556 desulfurization Effects 0.000 description 18
239000000155 melt Substances 0.000 description 10
238000007664 blowing Methods 0.000 description 9
IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
239000002893 slag Substances 0.000 description 7
NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 6
229910052717 sulfur Inorganic materials 0.000 description 6
239000011593 sulfur Substances 0.000 description 6
230000000694 effects Effects 0.000 description 5
XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
238000006243 chemical reaction Methods 0.000 description 4
229910052742 iron Inorganic materials 0.000 description 4
229910052757 nitrogen Inorganic materials 0.000 description 4
239000011248 coating agent Substances 0.000 description 3
238000000576 coating method Methods 0.000 description 3
238000007654 immersion Methods 0.000 description 3
239000002245 particle Substances 0.000 description 3
229910052786 argon Inorganic materials 0.000 description 2
QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
230000015572 biosynthetic process Effects 0.000 description 2
AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
239000006185 dispersion Substances 0.000 description 2
230000009189 diving Effects 0.000 description 2
230000001590 oxidative effect Effects 0.000 description 2
239000001301 oxygen Substances 0.000 description 2
229910052760 oxygen Inorganic materials 0.000 description 2
BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 2
239000001294 propane Substances 0.000 description 2
XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 1
229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
239000005997 Calcium carbide Substances 0.000 description 1
229910001018 Cast iron Inorganic materials 0.000 description 1
FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
229910000831 Steel Inorganic materials 0.000 description 1
238000007792 addition Methods 0.000 description 1
230000002411 adverse Effects 0.000 description 1
150000004645 aluminates Chemical class 0.000 description 1
239000000920 calcium hydroxide Substances 0.000 description 1
229910001861 calcium hydroxide Inorganic materials 0.000 description 1
235000011116 calcium hydroxide Nutrition 0.000 description 1
JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 1
229910052918 calcium silicate Inorganic materials 0.000 description 1
235000012241 calcium silicate Nutrition 0.000 description 1
XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
230000000052 comparative effect Effects 0.000 description 1
150000001875 compounds Chemical class 0.000 description 1
210000003298 dental enamel Anatomy 0.000 description 1
238000005516 engineering process Methods 0.000 description 1
230000002349 favourable effect Effects 0.000 description 1
239000011261 inert gas Substances 0.000 description 1
239000007788 liquid Substances 0.000 description 1
229910052749 magnesium Inorganic materials 0.000 description 1
239000011777 magnesium Substances 0.000 description 1
238000002844 melting Methods 0.000 description 1
230000008018 melting Effects 0.000 description 1
TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
230000002028 premature Effects 0.000 description 1
230000001681 protective effect Effects 0.000 description 1
229910052710 silicon Inorganic materials 0.000 description 1
239000010703 silicon Substances 0.000 description 1
239000010959 steel Substances 0.000 description 1
CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1

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

Definitions

the present invention relates to a process for the desulfurization of pig iron in a ladle which receives the pig iron, in particular in a torpedo pan, with a diving lance in which aluminum and then lime are blown into the pig iron with the aid of a carrier gas.
lime-based desulphurization agents have also been proposed. However, they have the disadvantage that large amounts are required to achieve the desired desulfurization effect. In practice, this leads to considerable Difficulties due to the large amounts of slag produced.
the considerable volume of the large amounts of slag in the pan leads to a corresponding reduction in the transport capacity of the pan.
the slags tend to stick to the pan walls, which further limits the transport capacity.
the slags also contain large amounts of iron droplets, which lead to significant iron losses.
a further development in the use of lime as a desulfurization agent is to add aluminum to the desulfurization agent (DE-AS 25 31 047) or first to blow aluminum and then lime into the pig iron with the aid of large amounts of conveying gas.
the large amounts of a non-oxidizing gas, such as nitrogen, to promote the lime also serve to disperse the lime particles in the pig iron melt and to generate a bath circulation.
a non-oxidizing gas such as nitrogen
the object of the present invention is to reduce both the amount of feed gas required and the consumption of the calcareous desulfurization agent.
the object is achieved according to the characterizing part of claim 1 by blowing in a solid in the pig iron melt with a quantity of 2 - 20 N1 carrier gas / kg desulfurizing agent together with the lime.
the gas-releasing solid preferably consists of an alkaline earth carbonate and / or an alkaline earth hydrate, limestone or dolomite being blown in as alkaline earth carbonate with particular advantage and hydrated lime hydrate as alkaline earth metal hydrate.
the aluminum is preferably blown into the melt in a fine-grained form with the aid of a carrier gas.
a carrier gas e.g., ethylene glycol
0.2-0.7 kg aluminum per ton of pig iron is mixed with an inert gas such as e.g. Blow propane, nitrogen or argon into the pig iron in 1 - 4 minutes.
the desulfurizing agent mixture preferably consists of 40-70% lime and 30-60 wt.% Gas-releasing solid. Small additions of carbon or carbon-containing substances such as carbon black, anthracite, graphite, petroleum coke, in the range of 1-10 wt.% Of the desulfurizing agent mixture are preferred added. This improves the flow properties of the blown-in mixture, and reducing conditions are created in the melt as a prerequisite for good desulfurization.
the blown-in mixture can contain 1-10% by weight of fluorspar.
Fluorspar (CaFz) lowers the enamel point of the aluminates formed, which therefore do not solidify as easily when the temperature of the melt is lowered.
the iron content absorbed by the melt is reduced.
the amount of aluminum and the amount of desulfurizing agent mixture depend on the desired degree of desulfurization.
a flow improver and / or a protective substance can be blown in together with the aluminum.
the lower amounts of desulfurizing agent lead to a reduction in the desulfurization slag formed and, associated therewith, to a reduction in iron losses.
the lower formation of slag causes less formation of slag in the torpedo pan and, seen over a longer period of time, leads to the capacity of the torpedo pan being changed only slightly. This also means that the bath geometry in the torpedo pan hardly changes, so that the favorable conditions remain constant over a longer period of time.
the amount of feed gas amounted to 75 Nl / kg of solid, both for blowing in the aluminum powder and for blowing in the lime.
the immersion lance which was provided with a thick refractory coating, had two nozzle-shaped outlet openings and therefore had to be inserted vertically through the mouth opening of the torpedo pan.
the desulfurization agent consisting of 60% by weight of lime, 40% by weight of limestone and 0.05% by weight of flow improver in the form of propyl alcohol blown into the melt using compressed air as the carrier gas.
the amount of feed gas was 5 Nl / kg solid.
a simple tube with a thin refractory coating was used as a lance, which was dipped diagonally into the pig iron. Despite the reduction in the blowing time from 25 to 12 minutes (including Al blowing) and a higher filling level of the torpedo pan, there was no significant cast iron ejection.
the desulfurization agent consisting of 55% by weight of lime, 35% by weight of lime hydrate, 5% by weight of CaF z , 5% by weight of anthracite and 0.03% by weight of flow improver in the form of Monoglyceride is blown into the melt using compressed air as the carrier gas.
the amount of feed gas was 4 Nl / kg.

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)
Treatment Of Steel In Its Molten State (AREA)

EP84107487A 1984-06-28 1984-06-28 Procédé de désulfuration de la fonte Expired EP0166019B1 (fr)

Priority Applications (7)

Application Number	Priority Date	Filing Date	Title
DE8484107487T DE3474568D1 (en)	1984-06-28	1984-06-28	Method for desulfurizing pig iron
AT84107487T ATE37902T1 (de)	1984-06-28	1984-06-28	Verfahren zur entschwefelung von roheisen.
EP84107487A EP0166019B1 (fr)	1984-06-28	1984-06-28	Procédé de désulfuration de la fonte
US06/743,854 US4586955A (en)	1984-06-28	1985-06-12	Process for desulphurizing hot metal
CA000485473A CA1239022A (fr)	1984-06-28	1985-06-27	Desulfuration des metaux en fusion
AU44244/85A AU570805B2 (en)	1984-06-28	1985-06-27	Desulphurisation of molten iron
CN85104955.9A CN1003308B (zh)	1984-06-28	1985-06-28	金属液脱硫工艺

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
EP84107487A EP0166019B1 (fr)	1984-06-28	1984-06-28	Procédé de désulfuration de la fonte

Publications (2)

Publication Number	Publication Date
EP0166019A1 true EP0166019A1 (fr)	1986-01-02
EP0166019B1 EP0166019B1 (fr)	1988-10-12

Family

ID=8192020

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP84107487A Expired EP0166019B1 (fr)	1984-06-28	1984-06-28	Procédé de désulfuration de la fonte

Country Status (7)

Country	Link
US (1)	US4586955A (fr)
EP (1)	EP0166019B1 (fr)
CN (1)	CN1003308B (fr)
AT (1)	ATE37902T1 (fr)
AU (1)	AU570805B2 (fr)
CA (1)	CA1239022A (fr)
DE (1)	DE3474568D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2780070A1 (fr) *	1998-06-22	1999-12-24	Elf Antar France	Procede de moussage d'un laitier recouvrant un bain d'acier en fusion

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
RU2159290C1 (ru) *	1999-07-07	2000-11-20	ОАО "Новолипецкий металлургический комбинат"	Способ обработки стали в ковше
RU2156309C1 (ru) *	1999-07-07	2000-09-20	ОАО "Новолипецкий металлургический комбинат"	Способ обработки стали в ковше
RU2203963C2 (ru) *	2001-01-16	2003-05-10	Открытое акционерное общество "Северсталь"	Способ обработки стали
RU2185448C1 (ru) *	2001-06-28	2002-07-20	Открытое акционерное общество "Новолипецкий металлургический комбинат"	Способ обработки стали в ковше
RU2184154C1 (ru) *	2001-06-28	2002-06-27	Урцев Владимир Николаевич	Способ производства горячекатаного листового проката
RU2204613C2 (ru) *	2001-07-23	2003-05-20	Открытое акционерное общество "Северсталь"	Способ внепечного рафинирования стали
RU2186857C1 (ru) *	2001-12-18	2002-08-10	ООО "Техномаг"	Способ производства проката круглого сечения
RU2201458C1 (ru) *	2002-06-04	2003-03-27	ООО "Сорби стил"	Способ модифицирования стали
RU2286393C1 (ru) *	2005-04-04	2006-10-27	Техком Импорт Экспорт Гмбх	Способ раскисления стали в ковше
US9365907B1 (en)	2013-03-14	2016-06-14	ALMAMET USA, Inc.	Conversion of troublesome lime fines to useful high quality fluidized lime in feeding flux lime to a BOF converter
RU2562848C1 (ru) *	2014-07-11	2015-09-10	Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН)	Способ раскисления стали в ковше
KR20220075376A (ko) *	2019-09-30	2022-06-08	자미폴 리미티드	칸바라 반응기(kr) 공정에서의 용선 탈황

Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2531047A1 (de) *	1975-07-11	1977-01-27	Kloeckner Werke Ag	Verfahren zum entschwefeln von roheisen
DE3015024C2 (de) *	1980-04-18	1982-12-23	Skw Trostberg Ag, 8223 Trostberg	Entschwefelungsmittel für Roheisen
EP0110508A1 (fr) *	1982-09-22	1984-06-13	Kawasaki Steel Corporation	Procédé pour la désulfuration de la fonte en fusion par injection
DE3004973C2 (de) *	1979-02-15	1987-10-01	Kawasaki Steel Corp., Kobe, Hyogo	Injektions-Entschwefelungsmittel

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US3998625A (en) *	1975-11-12	1976-12-21	Jones & Laughlin Steel Corporation	Desulfurization method
US4126453A (en) *	1976-05-17	1978-11-21	Esm, Inc.	Composition for a fluidizing flux in the production of iron and steel
US4137072A (en) *	1976-12-01	1979-01-30	Toyo Soda Manufacturing Co., Ltd.	Additive for use in refining iron
JPS55110711A (en) *	1979-02-16	1980-08-26	Nippon Steel Corp	Desulfurization of molten pig iron
US4462823A (en) *	1982-12-11	1984-07-31	Foseco International Limited	Treatment agents for molten steel

1984
- 1984-06-28 AT AT84107487T patent/ATE37902T1/de not_active IP Right Cessation
- 1984-06-28 EP EP84107487A patent/EP0166019B1/fr not_active Expired
- 1984-06-28 DE DE8484107487T patent/DE3474568D1/de not_active Expired
1985
- 1985-06-12 US US06/743,854 patent/US4586955A/en not_active Expired - Fee Related
- 1985-06-27 CA CA000485473A patent/CA1239022A/fr not_active Expired
- 1985-06-27 AU AU44244/85A patent/AU570805B2/en not_active Ceased
- 1985-06-28 CN CN85104955.9A patent/CN1003308B/zh not_active Expired

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
DE2531047A1 (de) *	1975-07-11	1977-01-27	Kloeckner Werke Ag	Verfahren zum entschwefeln von roheisen
DE3004973C2 (de) *	1979-02-15	1987-10-01	Kawasaki Steel Corp., Kobe, Hyogo	Injektions-Entschwefelungsmittel
DE3015024C2 (de) *	1980-04-18	1982-12-23	Skw Trostberg Ag, 8223 Trostberg	Entschwefelungsmittel für Roheisen
EP0110508A1 (fr) *	1982-09-22	1984-06-13	Kawasaki Steel Corporation	Procédé pour la désulfuration de la fonte en fusion par injection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
FR2780070A1 (fr) *	1998-06-22	1999-12-24	Elf Antar France	Procede de moussage d'un laitier recouvrant un bain d'acier en fusion

Also Published As

Publication number	Publication date
ATE37902T1 (de)	1988-10-15
AU570805B2 (en)	1988-03-24
EP0166019B1 (fr)	1988-10-12
AU4424485A (en)	1986-01-02
CN1003308B (zh)	1989-02-15
CN85104955A (zh)	1987-01-07
DE3474568D1 (en)	1988-11-17
CA1239022A (fr)	1988-07-12
US4586955A (en)	1986-05-06

Publication	Publication Date	Title
EP0164592B2 (fr)	1991-08-14	Agent de désulfuration à grain fin pour des bains de fonte brute et procédé de désulfuration
DE1758250B1 (de)	1971-10-28	Mittel zum Entschwefeln von Eisenschmelzen
EP0166019B1 (fr)	1988-10-12	Procédé de désulfuration de la fonte
DE2455802C2 (de)	1986-09-11	Zuschlag zur Entschwefelung von Eisen
DE3004973A1 (de)	1980-08-21	Entschwefelungsmittel
DE2708522A1 (de)	1978-08-31	Behandeln von eisenschmelzen mit erdalkalihaltigen, karbidischen und metallischen mitteln durch einblasen mit einem traegergas
DD202182A5 (de)	1983-08-31	Entschwefelungsgemisch und verfahren zu seiner herstellung
DE2642838C2 (de)	1985-04-18	Verfahren zum Desoxydieren und Entschwefeln von Stahlschmelzen
EP0220522B1 (fr)	1989-12-13	Mélange désulfurant pour bains métalliques, son procédé de fabrication et son utilisation
EP0038417B1 (fr)	1984-12-05	Agent de désulfuration
EP0175924B1 (fr)	1988-12-28	Procédé pour l'affinage de la fonte
DE3836549C1 (en)	1990-01-18	Process for desulphurising molten crude iron
DE3120138C3 (de)	1994-02-24	Pulverförmiges Entschwefelungsmittel
EP0582970B1 (fr)	1998-04-08	Produit pour désulfuration des fontes et des aciers liquides et procédé de désulfuration
DE2612500B2 (de)	1977-08-25	Reduktionsmittel fuer die stahlherstellung
EP0387580A1 (fr)	1990-09-19	Agent et procédé de désulfuration de métaux en fusion
DE2303668C3 (de)	1979-01-25	Zubereitungen zur Behandlung von geschmolzenem Stahl
DE2709062A1 (de)	1978-09-07	Mittel und verfahren zur entschwefelung von eisenschmelzen
DE2907069C3 (de)	1981-12-10	Mittel zur Entschwefelung von Metallschmelzen
EP0565763B1 (fr)	1997-01-29	Réactif et procédé pour le traitement de l'acier par le calcium
AT337231B (de)	1977-06-27	Verfahren zur herstellung von stahlen hoher reinheit im elektrischen lichtbogenofen
DE3644518A1 (de)	1988-07-14	Verwendung von magnesit und verfahren zur durchfuehrung einer solchen verwendung
DE1583268B1 (de)	1971-08-05	Mittel zur Entschwefelung von fluessigem Eisen auf der Basis von technischem Kalkstickstoff und Verfahren zur Entschwefelung von Eisen
DE2708403C2 (de)	1981-09-24	Feinkörnige Entschwefelungsgemische für Eisenschmelzen auf Basis von Erdalkalikarbonaten, sowie Verfahren zur Entschwefelung von Eisenschmelzen unter Verwendung dieser Entschwefelungsgemische
AT243837B (de)	1965-12-10	Verfahren zum Entschwefeln von Roheisen

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EP0166019A1 - Procédé de désulfuration de la fonte - Google Patents

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