EP0974673B1 - Méthode pour la désulfuration de la fonte liquide - Google Patents

Méthode pour la désulfuration de la fonte liquide Download PDF

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Publication number
EP0974673B1
EP0974673B1 EP99106651A EP99106651A EP0974673B1 EP 0974673 B1 EP0974673 B1 EP 0974673B1 EP 99106651 A EP99106651 A EP 99106651A EP 99106651 A EP99106651 A EP 99106651A EP 0974673 B1 EP0974673 B1 EP 0974673B1
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EP
European Patent Office
Prior art keywords
pig iron
additive
injection
injected
injection rate
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.)
Expired - Lifetime
Application number
EP99106651A
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German (de)
English (en)
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EP0974673A1 (fr
Inventor
Henner Dipl.-Ing. Hornberg
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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Publication of EP0974673A1 publication Critical patent/EP0974673A1/fr
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    • 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
    • C21C1/025—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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising

Definitions

  • the invention relates to a method for desulfurizing a pig iron melt, wherein a fine-grained desulfurizing agent and an additive by means of Transport gas are blown into a pig iron melt bath.
  • a pig iron melt after tapping off a blast furnace in a suitable vessel with calcium-containing desulphurising agents such as Calcium carbide (CaC2) and / or lime (CaO) can be desulfurized by these Desulphurising agent by mono-injection into the pig iron melt bath be injected (within the corresponding vessel).
  • This injection happens pneumatically, wherein a desulfurizing agent from a Carrier discharged and with the help of a transport gas through a Delivery line and a refractory injection lance in the molten iron melt conveyed in, i. blown.
  • the desulfurization so in particular calcium carbide and lime, and mixtures thereof, throughout Treatment time with a constant injection rate and a constant Transport gas rate injected into the pig iron melt.
  • the chemical Composition of the desulphurising agent can be adapted to the respective Requirements of a steelworks and pig iron properties vary.
  • This known Monoinjetechnischsvons with Calcium carbide and / or lime are relatively high Desulphurizer consumptions exposed.
  • EP-A-0 437 769 is a method for injecting powdery Treating agents known in pig iron and steel melts, wherein in one first period of time a low-priced treatment agent and in a second Period a high quality treatment agent is blown into the melt.
  • the treatment agents may be constant, increasing or decreasing in time the melt is blown.
  • the invention is therefore based on the object, a method according to the Preamble of claim 1 to improve such that with relatively simple measures of consumption of desulfurization compared to the known method significantly reduced and the efficiency of this Cast iron desulfurization can be increased.
  • the pig iron desulfurization process does it have a particularly favorable that the Desulphurising agent (calcium carbide and / or lime) and the gas-releasing substance (reagents) conveyed separately and then mixed in a joint delivery line and with relatively low transport gas rates in injected the pig iron melt (pig iron melt bath) with the dynamically changing injection rates, as has already been stated.
  • the Desulphurising agent calcium carbide and / or lime
  • the gas-releasing substance (reagents) conveyed separately and then mixed in a joint delivery line and with relatively low transport gas rates in injected the pig iron melt (pig iron melt bath) with the dynamically changing injection rates, as has already been stated.
  • the Calcium carbide and / or lime-containing, fine-grained Desulphurising agent in the initial stage of pig iron melt treatment with a blowing rate of about 80 up to 200 kg / min, preferably in the region of 100 kg / min, and in the final stage of the pig iron melt treatment with a blowing rate of about 5 to 25 kg / min, preferably in the range of about 20 kg / min, in the melt bath are blown.
  • the Blowing rate of the reducing, carbonaceous, gas-splitting additive from the beginning of Pig iron melt treatment until the end of this melt treatment from about 1 to 5 kg / min, preferably from about 3 kg / min, up to about 6 to 20 kg / min, preferably about 8 kg / min, be increased.
  • FIG. 1 the possibility is illustrated during the whole pig iron melt treatment time the desulphurising agent and the gas releasing agent Additive with the help of the transport gas by co-injection together in the pig iron melt bath blow.
  • the abscissa the blowing time t (in min) entered, while in the left coordinate the admission rates (for desulphurising agent and additive) ER (in kg / min) and in the right coordinate the transport gas rates TGR (in mol / min) are removed.
  • the injection rate desulphurising agent in this case especially calcium carbide, is represented by the curve a (solid line), the injection rate of the additive, in this case, for example, flame coal, is by a dot-dash line b and the transport gas rate (for example nitrogen as transport gas) is entered with a dashed straight line c. From this it can be clearly seen that the desulphurisation agent injection rate (a) of a relatively high Initial value (about 60 kg / min) at the beginning of the melt treatment time for about 13 1/2 min continuously is reduced and then in the final stages of Einblaszeit remains approximately constant.
  • the Blowing rate of the additive according to line b from the beginning the melt treatment time of about 3 kg / min until End of treatment time (about 20 minutes) up to 7 kg / min continuously on.
  • the transport gas rate (straight line c) is constant throughout this melt treatment time maintained at about 22.3 mol / min.
  • the injection of desulphurising agent and gas-releasing additive takes place here with relatively small and constant Transport volumes of gas.
  • FIG. 2 shows a graphic representation after which is assumed to be in an initial phase of about 1 1/2 to 2 minutes of the pig iron melt treatment time a pre-injection of pig iron melt only with the gas-releasing Additive is performed to a Deoxidation of pig iron melt and blast furnace slag bring about before the joint blowing (Co-injection) of this additive and the desulfurizing agent he follows.
  • the reaction time of the desulphurising agent in the pig iron melt be extended by the fact that - like Fig.2 also shows - in a final phase of about 2 1/2 min of pig iron melt treatment time only the gas-splitting additive into the pig iron melt is injected (so-called post-injection).
  • the injection rate decreases - according to line a in Figure 2 - from about 60 kg / min to about 20 kg / min, where the desulphurising agent (according to the line a) only is injected over a shortened treatment time, namely starting after about 2 1/2 min and ending about 2 1/2 min before the end of the injection time of the additive (Straight line b) or the pig iron melt treatment time (about 20 minutes).
  • the injection rate ER of the desulphurising agent according to the straight line a continuously from the beginning of the injection phase until reduced to the end of the injection phase, while the injection rate of the additive according to the curve b during the initial phase of about 2 1/2 min continuously with about 4 kg / min, then continuously increasing to about 17 1/2 min blowing time increases to about 8 kg / min and then continuously in the final phase of the blowing time this injection rate is left.
  • the pig iron according to the raw materials used as well as others Parameters have very different properties and compositions can, it is appropriate, at least the desulfurizing agent accordingly to assemble or adapt.
  • the desulfurizing agent may be a calcium carbide mixture having about 20 to 100% technical CaC2 content, preferably about 60 to 95% technical CaC 2 content and 0 to 80% CaO, preferably about 0 to 35% CaO while adding a carbonaceous, gas-releasing additive with a proportion of 1 to 10%, preferably about 1 to 5%, is used.
  • a desulfurizing agent Lime mixture with about 85 to 97% CaO, preferably with about 93 to 97% CaO, and to a carbonaceous, gas-releasing additive in a proportion of 3 up to 15%, preferably about 3 to 7% used.
  • a so-called “Gasabspaltender” is useful with reducing action, preferably gas coal, flame coal or others Hydrocarbons used.
  • the desulfurizing agent still further additives such as CaF2, Na2C03, Al2O3 or Na2O (albite) contains to the To reduce slag viscosity, so that pig iron particles from the slag again can slip down and thereby pig iron losses are reduced.
  • the desulfurizing agent still further additives such as CaF2, Na2C03, Al2O3 or Na2O (albite) contains to the To reduce slag viscosity, so that pig iron particles from the slag again can slip down and thereby pig iron losses are reduced.
  • transport gas is expediently nitrogen, argon, Natural gas or dried compressed air, but preferably Nitrogen used.
  • test series were on the one hand after the known mono-injection method (a) and on the other hand after the dynamic co-injection method according to the invention (b) performed in which the pig iron melt baths were recorded in torpedo pans.

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  • 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)

Claims (13)

  1. Procédé de désulfuration d'une fonte en fusion, dans lequel un agent de désulfuration en grains fins, ainsi qu'un additif, sont injectés à l'aide d'un gaz de transport dans un bain de fusion de fonte, l'agent de désulfuration et l'additif étant amenés séparément, et étant injectés ensemble dans le bain de fusion de la fonte, par co-injection, sur la plus grande partie de la durée de traitement de la fonte en fusion, de telle sorte que l'agent de désulfuration est injecté avec un débit d'injection plus élevé au début de sa phase d'injection qu'à la fin de la phase d'injection, tandis que le débit d'injection de l'additif est plus faible au début de sa phase d'injection qu'à la fin, avec utilisation de charbon à gaz, de charbon flambant ou d'hydrocarbures comme additif,
    caractérisé en ce que
    on utilise un mélange de carbure de calcium constitué de (en % en poids)
       20 % ou plus de CaC2 industriel,
       0 à 80 % de CaO et
       1 à 10 % d'additif
    et/ou un mélange de chaux constitué de (en % en poids)
       85 à 97 % de CaO,
       3 à 15% d'additif.
  2. Procédé selon la revendication 1, caractérisé en ce que le débit d'injection de l'agent de désulfuration diminue en continu ou par étapes, du début de la phase d'injection jusqu'à la fin de la phase d'injection, tandis que le débit d'injection de l'hydrocarbure augmente en continu ou par étapes, du début à la fin de la phase d'injection.
  3. Procédé selon la revendication 2, caractérisé en ce que l'agent de désulfuration est injecté dans le bain de fusion de la fonte avec un débit d'injection de 50 à 200 kg/min au cours de la phase initiale du traitement de la fonte en fusion, et avec un débit d'injection de 5 à 25 kg/min au cours de la phase finale du traitement de la fonte en fusion, tandis que le débit d'injection de l'additif passe de 1 à 5 kg/min à 6 à 20 kg/min, du début à la fin du traitement de la fonte en fusion.
  4. Procédé selon la revendication 1, caractérisé en ce que l'agent de désulfuration et l'additif sont injectés ensemble dans le bain de fusion de la fonte, à l'aide du gaz de transport, pendant toute la durée de traitement de la fonte en fusion.
  5. Procédé selon la revendication 1, caractérisé en ce que, au cours d'une phase initiale de la durée de traitement de la fonte en fusion, on effectue une désoxydation de la fonte en fusion, et on n'y injecte que l'additif (pré injection).
  6. Procédé selon la revendication 1 et/ou 5, caractérisé en ce que la durée de réaction de l'agent de désulfuration dans la fonte en fusion est allongé en ce que, dans une phase terminale de la durée de traitement de la fonte en fusion, on n'injecte plus que l'additif (post injection).
  7. Procédé selon les revendications 5 et 6, caractérisé en ce que, lors de l'injection du seul additif, ce dernier est injecté avec une quantité accrue de gaz de transport dans le bain de fusion de la fonte.
  8. Procédé selon la revendication 1, caractérisé en ce que l'on utilise comme agent de désulfuration un mélange de carbure de calcium avec 60 à 95 % de CaC2 industriel, 0 à 35 % de CaO, de même que 1 à 5 % d'additif.
  9. Procédé selon la revendication 1, caractérisé en ce que l'on utilise comme agent de désulfuration un mélange de chaux à 93 à 97 % de CaO, de même qu'un additif à 3 à 7 %.
  10. Procédé selon la revendication 8 ou 9, caractérisé en ce que l'agent de désulfuration contient des additifs de CaF2, Na2CO3, Al2O3 ou Na2O (Albite) pour réduire la viscosité des scories.
  11. Procédé selon la revendication 1, caractérisé en ce que les agents de traitement sont injectés avec une quantité de gaz de transport constante ou variable, de 44,6 à 67,0 mol/min, de préférence de 13,4 à 26,8 mol/min, dans le bain de fusion de la fonte.
  12. Procédé selon la revendication 11, caractérisé en ce que l'on utilise comme gaz de transport de l'azote, de l'argon, du gaz naturel ou de l'air comprimé séché, de préférence cependant de l'azote.
  13. Procédé selon la revendication 1, caractérisé en ce que, avant le début de la désulfuration de la fonte, au moins une partie des scories de haut fourneau entraínées dans la poche de réception du bain de fusion de la fonte, est éliminée.
EP99106651A 1998-07-22 1999-03-31 Méthode pour la désulfuration de la fonte liquide Expired - Lifetime EP0974673B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833037 1998-07-22
DE19833037A DE19833037A1 (de) 1998-07-22 1998-07-22 Verfahren zum Entschwefeln einer Roheisenschmelze

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Publication Number Publication Date
EP0974673A1 EP0974673A1 (fr) 2000-01-26
EP0974673B1 true EP0974673B1 (fr) 2005-03-09

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EP99106651A Expired - Lifetime EP0974673B1 (fr) 1998-07-22 1999-03-31 Méthode pour la désulfuration de la fonte liquide

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EP (1) EP0974673B1 (fr)
AT (1) ATE290611T1 (fr)
DE (2) DE19833037A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3577997B2 (ja) * 1999-06-07 2004-10-20 Ｊｆｅスチール株式会社 溶銑の脱硫方法
AT412477B (de) * 2003-07-14 2005-03-25 Donau Chemie Ag Mittel zur entschwefelung von metallschmelzen

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE788338A (fr) * 1971-09-22 1973-01-02 Polysius Ag Procede et installation de desulfuration chimique de fer en fusion
DE2261138C3 (de) * 1972-12-14 1975-05-15 Polysius Ag, 4723 Neubeckum Verfahren zum Einführen von Zuschlagstoffen in ein metallurgisches Bad
DE2716457C2 (de) * 1977-04-14 1985-11-21 Skw Trostberg Ag, 8223 Trostberg Verfahren zum Einblasen von Entschwefelungsgemischen in Eisenschmelzen
JPS5450416A (en) * 1977-09-30 1979-04-20 Denki Kagaku Kogyo Kk Hot iron desulfurizing agent
DE3544563C2 (de) * 1985-12-17 1998-07-16 Sueddeutsche Kalkstickstoff Mittel zur Entschwefelung von geschmolzenem Eisen
DE3942405A1 (de) * 1989-12-21 1991-06-27 Krupp Polysius Ag Verfahren und foerderanlage zum einblasen von pulverfoermigem behandlungsmittel in roheisen- und stahlschmelzen
DE4128499C2 (de) * 1991-08-28 1994-11-24 Thyssen Stahl Ag Verfahren zur Behandlung von Roheisenschmelzen zu deren Entschwefelung

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Publication number Publication date
ATE290611T1 (de) 2005-03-15
DE19833037A1 (de) 2000-01-27
EP0974673A1 (fr) 2000-01-26
DE59911720D1 (de) 2005-04-14

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