DE1932162A1 - Reducing the amount of undesirable ferrous - cpds in a cupola furnace during batch - Google Patents

Reducing the amount of undesirable ferrous - cpds in a cupola furnace during batch

Info

Publication number
DE1932162A1
DE1932162A1 DE19691932162 DE1932162A DE1932162A1 DE 1932162 A1 DE1932162 A1 DE 1932162A1 DE 19691932162 DE19691932162 DE 19691932162 DE 1932162 A DE1932162 A DE 1932162A DE 1932162 A1 DE1932162 A1 DE 1932162A1
Authority
DE
Germany
Prior art keywords
undesirable
reducing
cpds
amount
metallic
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.)
Pending
Application number
DE19691932162
Other languages
German (de)
Inventor
Daniel Fleming
Kruetzner Dipl-Ing Fritz
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.)
STRICO GES fur METALLURG und
Original Assignee
STRICO GES fur METALLURG und
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 STRICO GES fur METALLURG und filed Critical STRICO GES fur METALLURG und
Priority to DE19691932162 priority Critical patent/DE1932162A1/en
Publication of DE1932162A1 publication Critical patent/DE1932162A1/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B11/00—Making pig-iron other than in blast furnaces
    • C21B11/02—Making pig-iron other than in blast furnaces in low shaft furnaces or shaft furnaces

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)

Abstract

Quantity reduction of the undesirable cpds. is effected by maintaining thermal equilibrium during the transitional phase and keeping the melt zone constant. For the physical separation of different successive batch types a non-metallic material that melts at melt zone temp. is charged and melted. Pref. stones, synthetic slag and mixtures of these are used as the non-metallic material.

Description

"Verfahren zur Verminderung der Eisenmenge unerwünschter chemischer Zusammensetzung beim Wechsel von Satztypen im Supolofenbetrieb" Beim Wechsel von Satztypen im Kupolofenbetrieb ist bekannt, daß durch Zugabe von zusätzlichem Koks zwischen zwei Sätzen unterschiedlicher Komponentenmischung (sogenanntem Zwischenkoks) eine physikalische Trennung-der unterschiedlichen Gattierungen im Ofen erreicht wird. "Method of reducing the amount of iron undesirable chemical Composition when changing record types in Supolofen operation "When changing from Set types in cupola operation is known that by adding additional coke between two sets of different component mixes (so-called intermediate coke) a physical separation of the different types in the furnace is achieved will.

Ebenso ist bekannt, daß die Vollständigkeit der physikalischen Trennung vom Verhältnis der Nöhe der Zwischenkokssäule zur höhenmäßigen Ausdehnung der Schmelzzone abhängt. Bei einer zu geringen Bemessung der Zwischenkokssäule beginnt der nach, folgende Satztyp zu schmelzen, bevor der vorausgehende Satztyp vollständig erschmolzen ist, so daß über einen begrenzten Zeitraum ein Eisen erschmolzen wird, dessen chemische Zusammensetzung eine Mischung aus vorausgehender und nachfolgender Qualität darstellt, welche auch als Zwischeneisen bezeichnet wird.It is also known that the completeness of the physical separation the ratio of the height of the intermediate coke column to the height of the melting zone depends. If the size of the intermediate coke column is too small, the to melt the following sentence type before completely melting the preceding sentence type is, so that an iron is melted over a limited period of time, its chemical Composition is a mixture of previous and next quality, which is also known as an intermediate iron.

Ferner ist als Nachteil des geschilderten Verfahrens bekannt, daß durch Zugabe von Zwischenkoks vorübergehend die FUllkoksäule des Kupolofens erhöht und damit die Lage der Schmelzzone beeinflußt wird. Während der erneuten Einstellung des verbrennungs- und schmeltztechnischen Gleichgewichtes entsteht eine übermäßige Aufkohlung der nachfolgenden Gattierung, was sich besonders störend dann auswirkt, wenn das nachfolgende Eisen einen niedrigen Kohlenstoffgehalt besitzen soll. Diese Nachteile sollen durch das erfindungsgemäße Verfahren ausgeschaltet werden.A further disadvantage of the method described is known that temporarily increased the coke column of the cupola furnace by adding intermediate coke and thus the position of the melting zone is influenced. During the re-adjustment the combustion and smelting equilibrium results in an excessive Carburization of the subsequent type, which has a particularly disruptive effect if the subsequent iron is to have a low carbon content. These The method according to the invention is intended to eliminate disadvantages.

Erfindungsgemäß wird vorgeschlagen, den Ofen während der Ubergangszeit zwischen vorausgehenden und nachfolgendem Satztyp im thermtschen Gleichgewicht zu halten und den Bereich der Schmelzzone konstant zu halten, indem zur physikalischen Trennung der aufeinanderfolgenden Satztypen unterschiedlicher Gattierung ein nicht metallisches bei Schmelzzonentemperatur schmlezendes Material chargiert und geschmolzen wird.According to the invention it is proposed to use the furnace during the transition period between the preceding and following sentence type in Thermt's equilibrium keep and the area of Keeping the melting zone constant by for the physical separation of the successive record types of different Composition a non-metallic material which melts at the melting zone temperature is charged and melted.

Dabei soll dem nichtmetallischen Material jeweils soviel Brennstoff - vorwiegend Koks - zugegeben werden, wie zur Aufbringung der Aufheiz- und Schmelzwärme ftir dieses Material erforderlich ist.The non-metallic material should each have as much fuel - mainly coke - can be added, such as for the application of the heating and melting heat is required for this material.

Geeignete nicht metallische Schmelzen sind Schmelzen von Steinen, Steinmischungen und Ihnlichen Mineralien und/oder Mischungen von Mineralien, um eine geeignete Schlacke zu erreichen. Geeignete Mineralien sind auch vorgeschmolzene Schlacken, insbesondere Schlackenstücke von vorausgegangenen Schmelzen im Ofen selbst, u.a. auch sogenannte Restschlacke, die beim Restabstich des Ofens anfällt.Suitable non-metallic melts are stone melts, Stone mixtures and similar minerals and / or mixtures of minerals to to achieve a suitable slag. Suitable minerals are also premelted Slag, especially slag pieces from previous smelting in the furnace itself, including so-called residual slag, which occurs when the furnace is still tapped.

Claims (4)

P a t e n t a n s p r ü c h eP a t e n t a n s p r ü c h e 1.) Verfahren zur Verminderung der Eisenmenge unerwtinschter chemischer Zusammensetzung beim Wechsel von Satztypen bei jeder Art des Kupolofenbetriebes, dadurch gekennzeichnet, daß zur physikalischen Trennung aufeinanderfolgender Satztypen unterschiedlicher Gattierung ein nicht metallisches, bei Schmelzzone'ntemperatur schmelzendes Material chargiert und geschmolzan wird.1.) Method for reducing the amount of iron in undesired chemical Composition when changing set types in any type of cupola furnace operation, characterized in that for the physical separation of successive record types of different genera a non-metallic, at melting zone temperature melting material is charged and melted. 2.) Verfahren zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß dem zur phyzikalischen Trennung der metallischen Sätze dienenden nicht metallischen Material soviel Brennstoff, vorwiegend Koks, zugogeben wird, wie zur Erzeugung der Schaelzvlrae dient.2.) Method for performing the method according to claim 1, characterized characterized in that the one used for the physical separation of the metallic sentences as much fuel, mainly coke, is added to non-metallic material, how it is used to create the Schaelzvlrae. 3.) Verfahren zur Durchführung des Verfahrens nach Anspruch 1, dadurch gekennzeichnet, daß als nicht metallisches Material vorgeschmolzene Schlacke, Ersats- oder synthetische Schlacke, Steine, Steinmischungen oder ähnliche Mineralien verwendet werden.3.) Method for performing the method according to claim 1, characterized characterized that, as a non-metallic material, pre-melted slag, replacement or synthetic slag, stones, stone mixtures or similar minerals are used will. 4.) Anwendung der Verfahren nach Ansprüchen 1 bis 3 zur Verminderung von Analysenschwankungen beim Kupolofenbetrieb mit wechselnden Statztypen.4.) Application of the method according to claims 1 to 3 for reduction of analysis fluctuations in cupola operation with changing types of data.
DE19691932162 1969-06-25 1969-06-25 Reducing the amount of undesirable ferrous - cpds in a cupola furnace during batch Pending DE1932162A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19691932162 DE1932162A1 (en) 1969-06-25 1969-06-25 Reducing the amount of undesirable ferrous - cpds in a cupola furnace during batch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19691932162 DE1932162A1 (en) 1969-06-25 1969-06-25 Reducing the amount of undesirable ferrous - cpds in a cupola furnace during batch

Publications (1)

Publication Number Publication Date
DE1932162A1 true DE1932162A1 (en) 1971-01-07

Family

ID=5737951

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19691932162 Pending DE1932162A1 (en) 1969-06-25 1969-06-25 Reducing the amount of undesirable ferrous - cpds in a cupola furnace during batch

Country Status (1)

Country Link
DE (1) DE1932162A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992004587A1 (en) * 1990-09-12 1992-03-19 Cokeless Cupolas Limited Metal-melting furnaces

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992004587A1 (en) * 1990-09-12 1992-03-19 Cokeless Cupolas Limited Metal-melting furnaces
US5294243A (en) * 1990-09-12 1994-03-15 Cokeless Cupolas Limited Method of operating cokeless cupola

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