EP0064019A1 - Procédé et installation de désulfuration de fer fondu - Google Patents

Procédé et installation de désulfuration de fer fondu Download PDF

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Publication number
EP0064019A1
EP0064019A1 EP82630024A EP82630024A EP0064019A1 EP 0064019 A1 EP0064019 A1 EP 0064019A1 EP 82630024 A EP82630024 A EP 82630024A EP 82630024 A EP82630024 A EP 82630024A EP 0064019 A1 EP0064019 A1 EP 0064019A1
Authority
EP
European Patent Office
Prior art keywords
melt
solids
gases
gas
lime
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.)
Withdrawn
Application number
EP82630024A
Other languages
German (de)
English (en)
Inventor
Paul Metz
François Schleimer
Edouard Legille
Jean Goedert
Antoine Weiner
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.)
Arcelor Luxembourg SA
Original Assignee
Arbed SA
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 Arbed SA filed Critical Arbed SA
Publication of EP0064019A1 publication Critical patent/EP0064019A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
    • B22D1/002—Treatment with gases
    • B22D1/005—Injection assemblies therefor

Definitions

  • the present invention relates to a process for the desulfurization of molten iron, in particular molten steel, and the device required for this.
  • Calcium or calcium compounds such as CaO, CaF2, CaSi, CaC2, are mainly suitable as desulfurizing agents; the carrier gas is a neutral gas, e.g. Argon.
  • the slag should have less than 2% FeO, the mouth of the injection lance should be lower than 2000 mm below the bath level and the deoxidation should have been carried out in such a way that there is more than 0.015% Al in the metal phase.
  • the immersion depth ⁇ of the blowing lance should be at least 2 m; in the specific exemplary embodiment, 2.6 m are specified for a 4 m high pan.
  • calcium is assumed to have a vapor pressure of 2.13 atm at 1600 ° C. has liquid in the melt, provided it is at least 1.7 m below the bath surface. It is taught, for example, that the liquid calcium drops rise much more slowly than the vapor bubbles, which results in an extended reaction time and thus a better use of the calcium quantities used.
  • the aim of the present invention was to propose a method which largely dispenses with the use of strongly cooling aids, which avoids the time-consuming and temperature-sensitive transferring and which does not require the use of expensive and wear-resistant blowing lances and, moreover, through long-term contact between the melt and the Treatment substances prolonged reaction times as well as an improved utilization of the reagents.
  • This goal is achieved by the process according to the invention, which provides for largely removing the steel melt immediately after it has been refreshed, and then supplying it with gases and solids suspended in gases individually and in combination as required, using one and the same feed unit from below, the latter essentially consisting of one there is a refractory vessel bottom stone which is provided with oriented passages of such a type that they are gas-permeable at the same time without allowing the passage of liquid metal and switching on both the gas supply and the solids supply as required, and to control and interrupt them in terms of quantity.
  • the first process step according to the invention is to remove the melt as completely as possible. This step is essential since, as is well known, in the absence of furnace slag, the tendency to absorb nitrogen and hydrogen in the melt is markedly suppressed.
  • the covering of the bath with pure lime according to the invention mentioned later, is to be seen primarily as a protective measure against nitrogen or hydrogen uptake and only secondarily as a hate measure to influence the metallurgical processes at the phase boundaries. In fact, it was found that both nitrogen and hydrogen penetrate into the metal matrix during the subsequent desulfurization, provided that furnace slag of a certain composition is sufficient the quantities are available.
  • the next step consists in introducing pure lime into the melt with the aid of a neutral carrier gas through the charging unit, which is arranged in groups in the bottom of the metallurgical vessel.
  • a neutral carrier gas for example, serves as the carrier gas. This measure serves to cover the melt and thus to protect against the absorption of unwanted gases from the air.
  • a further protective measure against the uptake of N2 or H2 is carried out by closing the vessel with a tightly fitting lid, which only has openings for inserting measuring probes to record the temperature and possibly the oxygen activity.
  • the lime supply is throttled and metallic aluminum is mixed in with the aid of which the melt is deoxidized.
  • the aluminum powder introduced from below deoxidizes the melt particularly effectively; It is important to use aluminum in a mixture with lime in a ratio of 1: 1 to 1: 5 for the smooth passage of the aluminum through the charging unit.
  • melt is deoxidized to a maximum of 35 ppm 02, then a mixture consisting of metallic aluminum at 0-30% by weight, from flux paste at 0-20% by weight and from lime at 50-100 is always passed through the same charging unit % By weight in the melt.
  • the blowing process itself, it must be said that it takes place according to the invention by setting a constant carrier gas flow through the charging unit and varying the amount of mixture to be introduced per unit of time, as required. Depending on the melting temperature, the amount of mixture will be kept constant over the treatment period, or the main proportion will be entered within the initial period. Alternatively, it is provided according to the invention that the amount of mixture per unit of time is kept constant and the carrier gas flow is varied, in particular if, at certain points in time, greater or weaker whirling of the bath is important.
  • the Flexibility of the method according to the invention allows the solids supply to be throttled, interrupted and switched on again after sufficient swirling in the bath.
  • Each loading unit understands a refractory, gas-permeable structure, which consists of at least two fire-resistant, unfired, e.g. with a carbon carrier bound or chemically bound material existing segments are built, which are provided on at least one longitudinal surface with a wear-resistant pad.
  • the segments are combined by a common metal housing, which lies tightly against the longitudinal surfaces of the segments, possibly with the interposition of a mortar layer, with at least one connection and a distribution space for the material supply being arranged on an end face of the structure and the connection with at least one gas and is connected to at least one solid material feed device, each of which understands a metering device.
  • gas-permeable structures which are provided in accordance with the prior art for supplying gases into liquid metals and as described by the applicant in her Germany patents LU 82.552, 82.553, 82.554, 82.597 are used for the combined introduction of gases and solids, what by coupling the structure with also known, but in others Connections used solid feed devices is enabled.
  • the dosing device for solids is usefully a per se known cellular wheel blow-through lock as the applicant has described it eg in its Luxembourg patent LU 80.692.
  • the latter enables a stepless variation of the amount of mixture to be entered per unit of time, which can only be brought about by changing the cellular wheel rotation speed, the carrier gas flow rate being able to be varied independently of this.
  • a particularly favorable procedure is also made possible by the fact that the amount of desulphurization agents actually blown in can be determined continuously, and it is sufficient to do this by continuously measuring the weight of the emptying mixture storage container; a measure that does not allow the construction of most conventional systems.
  • melts desulphurized by the process according to the invention not only have the desired low sulfur content, but the metal itself is characterized by an extremely low content of inclusions, the latter being extremely spherical in character.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
EP82630024A 1981-04-24 1982-03-24 Procédé et installation de désulfuration de fer fondu Withdrawn EP0064019A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU83314A LU83314A1 (de) 1981-04-24 1981-04-24 Verfahren und vorrichtung zum entschwefeln von eisenschmelzen
LU83314 1981-04-24

Publications (1)

Publication Number Publication Date
EP0064019A1 true EP0064019A1 (fr) 1982-11-03

Family

ID=19729633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82630024A Withdrawn EP0064019A1 (fr) 1981-04-24 1982-03-24 Procédé et installation de désulfuration de fer fondu

Country Status (4)

Country Link
US (1) US4415358A (fr)
EP (1) EP0064019A1 (fr)
JP (1) JPS57181321A (fr)
LU (1) LU83314A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263255A1 (fr) * 1986-08-11 1988-04-13 Arbed S.A. Procédé et agent pour chauffer et purifier simultanément des bains métalliques
DE4003879C1 (fr) * 1990-02-08 1991-07-18 China Steel Corp., Kaohsiung City, Hsiao-Kang, Tw

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2256427B (en) * 1991-06-01 1994-05-11 B & K Engineering Co Flux injecting machines
US5324341A (en) * 1992-05-05 1994-06-28 Molten Metal Technology, Inc. Method for chemically reducing metals in waste compositions
LU92813B1 (en) * 2015-09-02 2017-03-20 Wurth Paul Sa Enhanced pressurising of bulk material in lock hoppers

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE928955C (de) * 1952-08-17 1955-06-16 Huettenwerk Haspe Ag Verfahren zum Entschwefeln von Roheisen
DE1583219A1 (de) * 1967-11-28 1970-07-30 Basf Ag Verfahren zur Behandlung von Metallschmelzen,vorzugsweise von Stahlschmelzen
DE2209902B2 (de) * 1972-03-01 1975-01-16 Thyssen Niederrhein Ag Huetten- Und Walzwerke, 4200 Oberhausen Verfahren zur Entschwefelung von Stahlschmelzen
DE2559188A1 (de) * 1975-01-14 1976-07-15 Inteco Int Techn Beratung Verfahren zur entschwefelung von stahlschmelzen
DE2602536A1 (de) * 1975-01-23 1976-07-29 Uss Eng & Consult Verfahren zur herstellung von schwefelarmen blasstahl
EP0013550A1 (fr) * 1978-12-21 1980-07-23 Arbed S.A. Procédé et installation de désulfuration de fer fondu
EP0021861A1 (fr) * 1979-04-25 1981-01-07 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Pièce réfractaire perméable aux gaz et son procédé de fabrication
EP0043338A1 (fr) * 1980-06-25 1982-01-06 Arbed S.A. Elément réfractaire perméable aux gaz
EP0043787A1 (fr) * 1980-07-09 1982-01-13 Arbed S.A. Elément réfractaire perméable aux gaz

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR90350E (fr) * 1965-10-21 1967-11-24 Air Liquide Procédé de traitement des métaux liquides, applicable notamment à l'élaboration de fonte nodulaire
US3574596A (en) * 1967-09-15 1971-04-13 Amsted Ind Inc Method for producing stainless steel
US3598383A (en) * 1969-01-14 1971-08-10 William H Moore Method and apparatus for incorporating additives in a melt
US3610602A (en) * 1969-10-14 1971-10-05 United States Steel Corp Gas-permeable refractory plug and method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE928955C (de) * 1952-08-17 1955-06-16 Huettenwerk Haspe Ag Verfahren zum Entschwefeln von Roheisen
DE1583219A1 (de) * 1967-11-28 1970-07-30 Basf Ag Verfahren zur Behandlung von Metallschmelzen,vorzugsweise von Stahlschmelzen
DE2209902B2 (de) * 1972-03-01 1975-01-16 Thyssen Niederrhein Ag Huetten- Und Walzwerke, 4200 Oberhausen Verfahren zur Entschwefelung von Stahlschmelzen
DE2559188A1 (de) * 1975-01-14 1976-07-15 Inteco Int Techn Beratung Verfahren zur entschwefelung von stahlschmelzen
DE2602536A1 (de) * 1975-01-23 1976-07-29 Uss Eng & Consult Verfahren zur herstellung von schwefelarmen blasstahl
EP0013550A1 (fr) * 1978-12-21 1980-07-23 Arbed S.A. Procédé et installation de désulfuration de fer fondu
EP0021861A1 (fr) * 1979-04-25 1981-01-07 INSTITUT DE RECHERCHES DE LA SIDERURGIE FRANCAISE (IRSID) France Pièce réfractaire perméable aux gaz et son procédé de fabrication
EP0043338A1 (fr) * 1980-06-25 1982-01-06 Arbed S.A. Elément réfractaire perméable aux gaz
EP0043787A1 (fr) * 1980-07-09 1982-01-13 Arbed S.A. Elément réfractaire perméable aux gaz

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0263255A1 (fr) * 1986-08-11 1988-04-13 Arbed S.A. Procédé et agent pour chauffer et purifier simultanément des bains métalliques
DE4003879C1 (fr) * 1990-02-08 1991-07-18 China Steel Corp., Kaohsiung City, Hsiao-Kang, Tw

Also Published As

Publication number Publication date
US4415358A (en) 1983-11-15
LU83314A1 (de) 1983-03-24
JPS57181321A (en) 1982-11-08

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE DE FR GB IT NL SE

17P Request for examination filed

Effective date: 19830425

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19841016

RIN1 Information on inventor provided before grant (corrected)

Inventor name: SCHLEIMER, FRANCOIS

Inventor name: GOEDERT, JEAN

Inventor name: WEINER, ANTOINE

Inventor name: LEGILLE, EDOUARD

Inventor name: METZ, PAUL