WO2005064022A1 - Agent de desulfuration des aciers et son utilisation pour la desulfuration de l'acier - Google Patents
Agent de desulfuration des aciers et son utilisation pour la desulfuration de l'acier Download PDFInfo
- Publication number
- WO2005064022A1 WO2005064022A1 PCT/FR2004/050754 FR2004050754W WO2005064022A1 WO 2005064022 A1 WO2005064022 A1 WO 2005064022A1 FR 2004050754 W FR2004050754 W FR 2004050754W WO 2005064022 A1 WO2005064022 A1 WO 2005064022A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel
- agent
- desulfurization
- slag
- lime
- Prior art date
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
Definitions
- the invention relates to the field of metallurgy and relates in particular to an agent for the desulfurization of steels, comprising a high content of Si0 2 , C2S, and of calcium aluminate, and its use for the desulfurization of steels.
- the production of steel is carried out schematically by two ways: - the transformation of iron ore into steel by means such as blast furnaces or converters, and - the processing of scrap in an electric furnace. It is known that the presence of impurities, phosphorus, sulfur in the steel obtained after refining of the cast iron is particularly harmful to the mechanical properties.
- the apparatuses for purifying cast iron and for preparing steel make it possible to reduce the sulfur content of the metal in part but do not however lead to total desulfurization which makes it possible to eliminate the abovementioned drawbacks, hence the need to refine the steel.
- the general principles of ripening can be summarized as described below. To extract the impurities from the steel, it must be put in intimate contact with a product having more affinity for the impurities, therefore having a lower free enthalpy.
- the essential refining means are: 1 - exchange through a slag 2- the formation of insoluble compounds 3- the decrease in the solubility of impurities in the steel by lowering their partial pressure by subjecting the steel to a vacuum.
- the chemical reaction leading to the desulfurization of steel is as follows:
- an agent for ( desulfurization of steels comprising, relative to the total weight of the agent: at least 10% of SiO 2 , at least 10% of C2S, and - at least 35% of at least one calcium aluminate and optionally a calcium silicoaluminate
- the composition of the desulfurization agent, comprising a high concentration of C2S allows, in addition to obtaining the advantages described above, to obtain an abundance of the desulphurizing agent, and therefore a powder.
- the desulphurizing agent is preferably in the form of a powder having a specific surface of between 1000 and 5000 cm 2 / g, preferably from 1000 to 2000 cm 2 / g.
- the desulfurization agent comprises, relative to the total weight of the agent, the following mineralogical phases: 10 to 60% of C2S, 0 to 50% of C3A, 0 to 50% of C2AS, - 0 to 70% of C12A7, and 0 to 60% of CA, provided that the composition comprises at least 35% of calcium aluminate or of a mixture of calcium aluminate and calcium silicoaluminate.
- the desulfurization agent comprises, with respect to the total weight of the agent, the following mineralogical phases: 10 to 30% of C2S, 30 to 60% of CA, and 10 to 40% of C2AS; or - 20 to 50% of C2S, 20 to 70% of C12A7 and 0 to 40% of C3A, preferably 10 to 40% of C3A.
- the desulfurization agent is obtained from a steel slag. This embodiment of the invention is particularly advantageous from the economic point of view, because it makes it possible to develop by-products from the steel industry.
- the desulfurizing agent according to the invention can be obtained by treating a slag from a molten steelworks in a controlled oxidizing atmosphere so as to modify its mineralogical and chemical composition and to remove the impurities so that it can serve as a sponge instead.
- the mixture of lime and fluxes usually used for refining may consist in producing a mixture of alumina or of products generating alumina and slag from a steelworks, then bring the mixture to a temperature between 1250 ° C and 1450 ° C, under a partial pressure of oxygen, between 10 ⁇ 1 and 10 ⁇ 6 bar.
- the alumina, or alumina-generating product can be added to the slag from the molten steelworks.
- the amount of alumina to be added to obtain the desulfurizing agent from the slag from the steelworks is 10 to 30% relative to the total weight of the slag, depending on the composition of the slag and / or the composition sought for the desulfurizing agent.
- the addition of alumina or an alumina-generating compound makes the slag more fusible and more suitable for desulfurization.
- the source of alumina is chosen from: bauxite, aluminum residues and red mud.
- the invention also relates to a process for desulfurization of steel comprising the addition to steel, of the desulfurizing agent as described above and of lime (CaO).
- the desulfurizing agent and the lime are mixed together before being added to the steel.
- the weight ratio of the desulfurizing agent to lime varies from 1 / 0.5 to 1/2, and preferably is 1/1.
- the desulfurization process for steels preferably takes place at a temperature between 1500 ° C and 1600 ° C, and most preferably at 1550 ° C.
- the slag and bauxite were mixed at a temperature between 1250 ° C and 1450 ° C, under a partial pressure of oxygen, between 10 "1 and 10 " 6 bar, then mixed with lime in the proportions, expressed as a percentage by weight, described in Table 3.
- composition in the mineralogical phase of the desulfurization agents obtained from the compositions described in Table 3 is given in Table 4 below.
- the capacity of the desulfurization agents has been tested in the laboratory.
- the desulfurization agents were mixed with molten steel in a 1/1 weight proportion.
- the concentrations (P / P) of sulfur, of the molten steel and of the desulfurization agent were measured by X-ray fluorescence, before and after treatment of the steel with the desulfurization agent. The results are collated in Table 5.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/584,214 US7563303B2 (en) | 2003-12-24 | 2004-12-23 | Steel desulphurating agent and use thereof in the desulphuration of steel |
EP04816601A EP1699940A1 (fr) | 2003-12-24 | 2004-12-23 | Agent de desulfuration des aciers et son utilisation pour la desulfuration de l acier |
JP2006546288A JP2007517137A (ja) | 2003-12-24 | 2004-12-23 | 鋼脱硫剤および鋼の脱硫におけるその使用 |
BRPI0418087-9A BRPI0418087A (pt) | 2003-12-24 | 2004-12-23 | agente de dessulfuração dos aços e processo de dessulfuração do aço |
CA002551270A CA2551270A1 (fr) | 2003-12-24 | 2004-12-23 | Agent de desulfuration des aciers et son utilisation pour la desulfuration de l'acier |
US12/176,698 US20080302210A1 (en) | 2003-12-24 | 2008-07-21 | Steel desulphurating agent and use thereof in the desulphuration of steel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0351202A FR2864551B1 (fr) | 2003-12-24 | 2003-12-24 | Agent de desulfuration des aciers et son utilisation pour la desulfuration de l'acier |
FR0351202 | 2003-12-24 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/176,698 Division US20080302210A1 (en) | 2003-12-24 | 2008-07-21 | Steel desulphurating agent and use thereof in the desulphuration of steel |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005064022A1 true WO2005064022A1 (fr) | 2005-07-14 |
Family
ID=34639756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2004/050754 WO2005064022A1 (fr) | 2003-12-24 | 2004-12-23 | Agent de desulfuration des aciers et son utilisation pour la desulfuration de l'acier |
Country Status (12)
Country | Link |
---|---|
US (2) | US7563303B2 (fr) |
EP (1) | EP1699940A1 (fr) |
JP (1) | JP2007517137A (fr) |
KR (1) | KR20060127038A (fr) |
CN (1) | CN1906313A (fr) |
BR (1) | BRPI0418087A (fr) |
CA (1) | CA2551270A1 (fr) |
FR (1) | FR2864551B1 (fr) |
RU (1) | RU2006126687A (fr) |
UA (1) | UA84723C2 (fr) |
WO (1) | WO2005064022A1 (fr) |
ZA (1) | ZA200605217B (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007514634A (ja) * | 2003-12-18 | 2007-06-07 | ラファルジュ | 水硬性無機組成物、その製造方法、並びにそのような組成物を含有するセメント製品および水硬性バインダー |
Families Citing this family (9)
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---|---|---|---|---|
JP5251360B2 (ja) * | 2008-08-25 | 2013-07-31 | 新日鐵住金株式会社 | 取鍋精錬法による清浄鋼の製造方法 |
JP2010095793A (ja) * | 2008-09-22 | 2010-04-30 | Tohoku Univ | フッ素含有脱硫スラグの再生法 |
CN102876842A (zh) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | 以12CaO_7Al2O3和3CaO_5Al2O3为主相的预熔型化渣脱硫剂 |
CN103738988B (zh) * | 2013-12-26 | 2015-07-29 | 张延大 | 利用工业废渣资源制备造渣脱硫剂的方法 |
CN104451032B (zh) * | 2015-01-06 | 2016-06-01 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种半钢用的脱磷脱硫剂及其制备方法和用途 |
CN104561446B (zh) * | 2015-01-06 | 2016-09-14 | 攀钢集团攀枝花钢铁研究院有限公司 | 一种半钢脱磷脱硫剂及其制备方法和用途 |
EP3670677A1 (fr) * | 2018-12-17 | 2020-06-24 | S.A. Lhoist Recherche Et Developpement | Procédé de fabrication d'un agent de conditionnement de laitier pour la désulfuration d'acier |
EP3942080A1 (fr) * | 2019-03-22 | 2022-01-26 | Tata Steel Nederland Technology B.V. | Procédé de fabrication de fer dans un récipient métallurgique |
CN112391510A (zh) * | 2020-10-29 | 2021-02-23 | 张家港宏昌钢板有限公司 | 一种新的铁水脱硫工艺 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2541310A1 (fr) * | 1983-02-18 | 1984-08-24 | Lafarge Fondu Int | Procede de fabrication d'une scorie de desulfuration de l'acier |
US4560405A (en) * | 1984-09-03 | 1985-12-24 | Nippon Kokan Kabushiki Kaisha | Process for desulfurizing molten steel |
JPH05117735A (ja) * | 1991-10-30 | 1993-05-14 | Kawasaki Steel Corp | 溶銑脱硫剤及び該脱硫剤を用いる溶銑脱硫方法 |
JPH06228626A (ja) * | 1993-01-29 | 1994-08-16 | Kawasaki Steel Corp | 脱硫前処理としてのスラグ改質方法 |
JP2002060832A (ja) * | 2000-08-08 | 2002-02-28 | Nippon Magnetic Dressing Co Ltd | カルシウムアルミネート系脱硫剤 |
JP2002339014A (ja) * | 2001-03-16 | 2002-11-27 | Kawasaki Steel Corp | 極低硫鋼の製造方法 |
JP2003129122A (ja) * | 2001-10-25 | 2003-05-08 | Denki Kagaku Kogyo Kk | 鉄鋼添加剤 |
JP2003328022A (ja) * | 2002-05-16 | 2003-11-19 | Nippon Magnetic Dressing Co Ltd | 溶鋼用脱硫剤及びその製造方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2839066B1 (fr) * | 2002-04-24 | 2005-02-04 | Lafarge Aluminates | Liant ettringitique pour mortier dense, comprenant des sulfates de calcium et un compose mineral d'aluminates de calcium |
-
2003
- 2003-12-24 FR FR0351202A patent/FR2864551B1/fr not_active Expired - Fee Related
-
2004
- 2004-12-23 EP EP04816601A patent/EP1699940A1/fr not_active Withdrawn
- 2004-12-23 KR KR1020067013913A patent/KR20060127038A/ko not_active Application Discontinuation
- 2004-12-23 CA CA002551270A patent/CA2551270A1/fr not_active Abandoned
- 2004-12-23 JP JP2006546288A patent/JP2007517137A/ja active Pending
- 2004-12-23 CN CNA2004800407718A patent/CN1906313A/zh active Pending
- 2004-12-23 WO PCT/FR2004/050754 patent/WO2005064022A1/fr active Application Filing
- 2004-12-23 UA UAA200606955A patent/UA84723C2/ru unknown
- 2004-12-23 US US10/584,214 patent/US7563303B2/en not_active Expired - Fee Related
- 2004-12-23 BR BRPI0418087-9A patent/BRPI0418087A/pt not_active Application Discontinuation
- 2004-12-23 RU RU2006126687/02A patent/RU2006126687A/ru not_active Application Discontinuation
-
2006
- 2006-06-23 ZA ZA200605217A patent/ZA200605217B/xx unknown
-
2008
- 2008-07-21 US US12/176,698 patent/US20080302210A1/en not_active Abandoned
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2541310A1 (fr) * | 1983-02-18 | 1984-08-24 | Lafarge Fondu Int | Procede de fabrication d'une scorie de desulfuration de l'acier |
US4560405A (en) * | 1984-09-03 | 1985-12-24 | Nippon Kokan Kabushiki Kaisha | Process for desulfurizing molten steel |
JPH05117735A (ja) * | 1991-10-30 | 1993-05-14 | Kawasaki Steel Corp | 溶銑脱硫剤及び該脱硫剤を用いる溶銑脱硫方法 |
JPH06228626A (ja) * | 1993-01-29 | 1994-08-16 | Kawasaki Steel Corp | 脱硫前処理としてのスラグ改質方法 |
JP2002060832A (ja) * | 2000-08-08 | 2002-02-28 | Nippon Magnetic Dressing Co Ltd | カルシウムアルミネート系脱硫剤 |
JP2002339014A (ja) * | 2001-03-16 | 2002-11-27 | Kawasaki Steel Corp | 極低硫鋼の製造方法 |
JP2003129122A (ja) * | 2001-10-25 | 2003-05-08 | Denki Kagaku Kogyo Kk | 鉄鋼添加剤 |
JP2003328022A (ja) * | 2002-05-16 | 2003-11-19 | Nippon Magnetic Dressing Co Ltd | 溶鋼用脱硫剤及びその製造方法 |
Non-Patent Citations (7)
Title |
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PATENT ABSTRACTS OF JAPAN vol. 017, no. 478 (C - 1104) 31 August 1993 (1993-08-31) * |
PATENT ABSTRACTS OF JAPAN vol. 018, no. 604 (C - 1275) 17 November 1994 (1994-11-17) * |
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 06 4 June 2002 (2002-06-04) * |
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 03 5 May 2003 (2003-05-05) * |
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 09 3 September 2003 (2003-09-03) * |
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05) * |
VIKHLEVSHCHUK V A ET AL: "COMPLEX PRACTICE FOR PRODUCING LOW SULPHUR STEEL", STEEL IN THE USSR, METALS SOCIETY. LONDON, GB, vol. 18, no. 3, 1 March 1988 (1988-03-01), pages 107 - 109, XP000023501 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007514634A (ja) * | 2003-12-18 | 2007-06-07 | ラファルジュ | 水硬性無機組成物、その製造方法、並びにそのような組成物を含有するセメント製品および水硬性バインダー |
Also Published As
Publication number | Publication date |
---|---|
FR2864551B1 (fr) | 2006-07-07 |
BRPI0418087A (pt) | 2007-04-17 |
CN1906313A (zh) | 2007-01-31 |
ZA200605217B (en) | 2008-09-25 |
FR2864551A1 (fr) | 2005-07-01 |
US20080302210A1 (en) | 2008-12-11 |
EP1699940A1 (fr) | 2006-09-13 |
RU2006126687A (ru) | 2008-01-27 |
UA84723C2 (ru) | 2008-11-25 |
JP2007517137A (ja) | 2007-06-28 |
US7563303B2 (en) | 2009-07-21 |
CA2551270A1 (fr) | 2005-07-14 |
KR20060127038A (ko) | 2006-12-11 |
US20070144306A1 (en) | 2007-06-28 |
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