DE2740842A1 - Bottom blown steel refining agent - consists of oxygen entirely or partly in form of carbon di:oxide, and/or solid oxide and/or carbonate - Google Patents

Bottom blown steel refining agent - consists of oxygen entirely or partly in form of carbon di:oxide, and/or solid oxide and/or carbonate

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Publication number
DE2740842A1
DE2740842A1 DE19772740842 DE2740842A DE2740842A1 DE 2740842 A1 DE2740842 A1 DE 2740842A1 DE 19772740842 DE19772740842 DE 19772740842 DE 2740842 A DE2740842 A DE 2740842A DE 2740842 A1 DE2740842 A1 DE 2740842A1
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DE
Germany
Prior art keywords
oxide
partly
carbonate
oxygen
solid oxide
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Withdrawn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
DE19772740842
Other languages
German (de)
Inventor
Ernst Peter Prof Dipl I Franke
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.)
Franke ernst Peter profdipl-Ing
Original Assignee
Franke ernst Peter profdipl-Ing
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 Franke ernst Peter profdipl-Ing filed Critical Franke ernst Peter profdipl-Ing
Priority to DE19772740842 priority Critical patent/DE2740842A1/en
Publication of DE2740842A1 publication Critical patent/DE2740842A1/en
Withdrawn legal-status Critical Current

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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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/34—Blowing through the bath

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

Steel which is refined by bottom blowing a reagent consisting entirely or partly of O2 in the form of gaseous CO2, and/or solid oxide, and/or carbonate which are easily dissociated. The proportions of the constituents are chosen so that overheating of the hearth of the refining furnace is avoided. Advantageously the CO produced in the reaction can be utilised as a stirring agent in the melt.

Description

Beschreibuns, Verfahren und VorrichtungDescription, method and device

Titel: (technische Bezeichnung) Frischmittel bei bodenblasenden Stahlerzeugungsverfahren.Title: (technical name) Fresh agent in bottom blowing steelmaking processes.

Anwendungsgebiet: (Wiedergabe des Oberbegriffs des Patentanspruchs 1) Die Erfindung betrifft feste und gasförmige Frischmittel, die bei bodenblasenden Stahlerzeugungsverfahren mit Inertgasen oder gasförmigen Sauerstoffträgern durch Bodendüsen zugeführt werden.Area of application: (Reproduction of the preamble of the patent claim 1) The invention relates to solid and gaseous fresh agents that are used in bottom blowing Steelmaking process with inert gases or gaseous oxygen carriers Floor nozzles are fed.

Zweck: Bei bodenblasenden Stahlerzeugungsverfahren soll Sauerstoff in solcher Form der zu frischenden Schmelze zugeführt werden, daß eine Uberhitzung des Bodens vermieden wird.Purpose: In the case of bottom-blowing steelmaking processes, oxygen be fed in such a form to the melt to be freshened that overheating of the soil is avoided.

Stand der Technik mit Fundstellen: Es ist bekannt, daß bei diskontinuierlich arbeitenden bodenblasenden Stahlerzeugungsverfahren Feststoffe als Schlackenbildner mit metallurgisch reinem Sauerstoff eingeblasen werden.Prior art with references: It is known that in discontinuous working bottom-blowing steelmaking process solids as slag formers be blown in with metallurgically pure oxygen.

Um den Boden vor Überhitzung zu schützen, wird der O2-Stahl von Kohlenwasserstoffen eingehüllt.To protect the soil from overheating, the O2 steel is made of hydrocarbons enveloped.

Kritik des Standes der Technik: Bei den bekannten bodenblasenden StahlerzeugungF verfahren wird die Überhitzung des Gefäßbodens dadurch vermieden, daß der 02-St*ahl von Kohlenwasserstoffen eingehüllt wird und die Reaktion des Bades mit dem gasförmigen °2 verzögert wird.Criticism of the Prior Art: In the known bottom-blowing steelmaking F. procedure, the overheating of the bottom of the vessel is avoided by the fact that the 02-St * ahl is enveloped by hydrocarbons and the reaction of the bath with the gaseous ° 2 is delayed.

Durch die thermische Dissoziation der Kohlenwasserstoffe erfolgt eine große Aufnahme von Wasserstoff durch den Stahl. Dieser Wasserstoff muß durch Nachläsen mit Luft oder anderen Gasen ausgespült werden. Dadurch zugibt sich eine eventuelle Erhöhung des S*ickstoffgehaltes im Stahl.The thermal dissociation of the hydrocarbons causes a large absorption of hydrogen by steel. This hydrogen has to be relieved flushed with air or other gases. This gives a possible Increase in the nitrogen content in the steel.

Aufgabe: Der Erfindung liegt die Aufgabe zugrunde, bei bodenblasenden Stahlerzeugungsverfahren den Sauerstoff in solcher Form zuzuführen, daß 1. eine Überhitzung des Bodens vermieden wird, 2. ein für den Stahl nicht schädliches Rührgas (also z.3. Vermeidung von Wasserstoff) zur Verfügung steht.Task: The invention is based on the task of bottom blowing Steelmaking process to supply the oxygen in such a form that 1. a Overheating of the soil is avoided, 2. a stirring gas that is not harmful to the steel (i.e. z.3. Avoidance of hydrogen) is available.

Lösung: (Wiedergabe des kennzeichnenden Teils des Patentanspruchs 1) Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß bei bodenblasenden Stahlerzeugungsverfahren Sauerstoff als Gemenge von gasförmigem und chemisch gebundenem Sauerstoff in Form dissoziierbaren Oxiden oder Karbonaten in den Reaktionsraum eingeblasen wird.Solution: (Reproduction of the characterizing part of the claim 1) This object is achieved according to the invention in that, in the case of bottom blowing steelmaking processes Oxygen as a mixture of gaseous and chemically bound oxygen in the form dissociable oxides or carbonates is blown into the reaction chamber.

Durch Variation der Idengenverhältnisse der einzublasenden Stoffe zueinander kann aufgrund der endothermen Dissoziationsreaktionen die Temperatur über dem Gefäßboden so gesteuert werden, daß eine Uberhitzung vermieden wird.By varying the proportions of the substances to be injected due to the endothermic dissociation reactions, the temperature can be controlled above the bottom of the vessel so that overheating is avoided.

Gleichzeitig wird kein schädliches Fremdgas als Rührgas benötigtlsondern das bei der Reduktion des C02 übriggebliebene CO als Rührgas verwendet.At the same time, no harmful foreign gas is required as the stirring gas the CO left over from the reduction of the CO 2 is used as stirring gas.

Claims (1)

Patentansprüche: Oberbegriff: Frischmittel bei bodenblasenden Stanlerzeugungsverfahren. Claims: Generic term: Fresh agent in bottom blowing stanchion production processes. Kennzeichnender Teil: dadurch gekennzeichnet, daß 1. Sauerstoff ganz oder teilweise chemisch gebunden als leicht dissoziierbares gasförmiges CO2 und/oder festes Oxid und/oder Xarbonat zugeführt wird und 2. die Mengenverhältnisse der Sauerstoffträger zueinander so eingestellt werden, daß eine Uberhitzung des Gefäßbodens vermieden wird.Characteristic part: characterized in that 1. whole oxygen or partially chemically bound as easily dissociable gaseous CO2 and / or solid oxide and / or xarbonate is supplied and 2. the proportions of the oxygen carriers be adjusted to each other so that overheating of the bottom of the vessel is avoided will.
DE19772740842 1977-09-10 1977-09-10 Bottom blown steel refining agent - consists of oxygen entirely or partly in form of carbon di:oxide, and/or solid oxide and/or carbonate Withdrawn DE2740842A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19772740842 DE2740842A1 (en) 1977-09-10 1977-09-10 Bottom blown steel refining agent - consists of oxygen entirely or partly in form of carbon di:oxide, and/or solid oxide and/or carbonate

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772740842 DE2740842A1 (en) 1977-09-10 1977-09-10 Bottom blown steel refining agent - consists of oxygen entirely or partly in form of carbon di:oxide, and/or solid oxide and/or carbonate

Publications (1)

Publication Number Publication Date
DE2740842A1 true DE2740842A1 (en) 1979-03-22

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Family Applications (1)

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DE19772740842 Withdrawn DE2740842A1 (en) 1977-09-10 1977-09-10 Bottom blown steel refining agent - consists of oxygen entirely or partly in form of carbon di:oxide, and/or solid oxide and/or carbonate

Country Status (1)

Country Link
DE (1) DE2740842A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0049148A1 (en) * 1980-09-26 1982-04-07 Nippon Steel Corporation A method of preventing damage to an immersed tuyere of a decarburization furnace in steel making

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0049148A1 (en) * 1980-09-26 1982-04-07 Nippon Steel Corporation A method of preventing damage to an immersed tuyere of a decarburization furnace in steel making

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