WO1998054368A1 - Procede de production de fonte liquide a partir d'eponge de fer et installation pour sa mise en oeuvre - Google Patents
Procede de production de fonte liquide a partir d'eponge de fer et installation pour sa mise en oeuvre Download PDFInfo
- Publication number
- WO1998054368A1 WO1998054368A1 PCT/BE1998/000063 BE9800063W WO9854368A1 WO 1998054368 A1 WO1998054368 A1 WO 1998054368A1 BE 9800063 W BE9800063 W BE 9800063W WO 9854368 A1 WO9854368 A1 WO 9854368A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- iron
- metallurgical
- sponge
- furnace
- iron sponge
- 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.)
- Ceased
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
Definitions
- the present invention relates to a process for producing liquid cast iron from pre-reduced iron ores, also called iron sponges, with a view to supplying liquid iron to a steelworks furnace, as well as an installation for its implementation .
- the charge of the electric furnace can be of mixed origin, namely a part coming in liquid form from the blast furnace and the other formed by an addition in solid form of scrap, HBI, DRI, or other.
- liquid iron constitutes a very interesting source of heat to preheat various components used in the charge of electric ovens, because it contributes to a strong reduction in the electric energy consumed.
- the present invention provides a solution to this problem, taking as a starting point the fact that iron sponges constitute, for electric ovens, a charge. interesting, if not even more interesting than scrap. Indeed, these materials contain much less undesirable elements than scrap
- iron sponges are generally advantageous because their price is not only more constant, but also often lower than that of scrap.
- loading hot iron sponges saves appreciable amounts of electrical energy during their melting. This procedure is particularly advantageous in the case where the pre-reduced production unit is in the immediate vicinity of the electric melting furnace.
- iron sponge that is to say free of the majority of the gangue which accompanies it during its passage in the production furnace.
- iron sponge and available at the outlet of the latter in clean form at high temperature, at least greater than 900 ° C.
- a final non-negligible advantage of our process for producing liquid cast iron from iron sponge is that it provides a solution to the problem posed by the continuous operation of certain furnaces for producing iron sponge, with the effect a continuous extraction of the latter, and by the discontinuous operation of electric ovens which is clocked by the loading, the treatment of the load and the unloading of the liquid steel.
- a method for producing liquid cast iron in which an iron sponge is used as a raw material, the metallization rate of which is greater than 80% and which is extracted from the iron sponge production oven. at a temperature above 900 ° C., is characterized in that a metallurgical container in which an quantity of liquid iron, called heel, in that it causes the fusion, the reduction of the remaining FeO and the carburetion of the above-mentioned iron sponge, and in that a part is transferred, preferably more than 60%, of the liquid charge of pig iron produced during the aforementioned metallurgical operations in an electric steel furnace.
- this pig iron is fed into the steelworks electric furnace continuously and under electric charge.
- part of said charge is carburetted in a metallurgical vessel so as to produce cast iron to form the heel of liquid iron.
- a metallurgical container is supplied with hot iron sponge, the iron sponge is melted by appropriate means, it is reduced and carburized, to produce the cast iron to form the heel liquid iron.
- an iron sponge is used whose metallization rate is between 85% and 90%.
- iron sponge containing less than 2% of C. is used.
- part of the gangue which accompanies the iron sponge is removed from the oven for producing iron sponge.
- a metallurgical container is supplied with an iron sponge, the temperature of which is greater than 900 ° C., preferably greater than 1100 ° C.
- the carbon concentration of the iron bath present in a metallurgical vessel is controlled so that it is greater than 3.5%.
- carbon or materials containing carbon, preferably carbon are injected into the melting bath present in a metallurgical vessel, as and when the iron sponge.
- the cast iron bath present in a metallurgical container is heated so as to maintain its temperature above 1300 ° C., preferably 1450 ° C.
- the heating is of the electric type, preferably of the electric induction type or of the electric arc type.
- the heating is of the fossil fuel type, preferably of the thermal type, either by flame with air, oxygenated air or oxygen as oxidant, preferably oxidant. is preheated.
- a modality of the invention either only a solid, liquid or gaseous fuel is used, or different fuels are combined to optimize the efficiency of the heating operation, preferably pulverized or non-pulverized coal is used.
- the addition of carbonaceous materials and the additional heat are regulated so as to produce, in a metallurgical container, cast iron containing at least 3.5% of C.
- the basicity of the slag present in a metallurgical vessel is regulated so as to obtain a basicity index i, defined by the ratio of CaO to SiO2, both being expressed as a percentage by weight, greater than 1, while producing a cast iron whose S concentration is less than 0.05%, preferably by injecting lime into the cast iron bath.
- most of the gases generated during the operation of feeding a metallurgical container with iron sponge are confined and directed towards the iron sponge production furnace, said gases being almost exclusively made up of CO.
- the abovementioned gases are used in the abovementioned iron sponge production furnace either as a heat source, or as a reducing agent for the charge of the furnace, or both.
- the molten metal present in a metallurgical container is stirred by blowing an inert gas into the latter, preferably argon or nitrogen.
- the gases produced in a metallurgical container are used to preheat materials introduced into the electric steel furnace.
- the present invention also relates to an installation for implementing the method of the present invention.
- the installation for producing liquid iron for implementing the method comprises at least one furnace for producing iron sponge, one or more metallurgical vessels intended to contain a heel of liquid iron , at least one electric furnace for producing liquid steel and means for transferring a quantity of iron sponge to at least one of the aforementioned metallurgical vessels.
- At least one of the metallurgical vessels comprises an induction heating means.
- At least one of the metallurgical vessels is a pocket oven with arc heating.
- At least one of the metallurgical vessels is provided with a heating means with at least one plasma torch, preferably with a transferred arc.
- the metallurgical container or containers are provided with means for introducing both solid and fluid materials, preferably they comprise at least one brick device porous located in the bottom of the container and / or at least one device with an injection lance.
- the metallurgical container or containers are provided with heating means comprising one or more electrodes.
- the metallurgical container or containers are provided with O 2 injection means.
- the metallurgical container or containers are provided with burners, preferably with coal with or without additional addition of air or oxygen.
- At least one of the metallurgical vessels is provided with means for confining the gases from the liquid iron it contains and also with means for recycling said gases to the iron sponge production furnace.
- Metallurgical vessels initial characteristics: heel: t 20.0 20.0 C% 4.70 4.70 S% 0.020 0.020 temp. ° C 1350 1350
- the load of 65 t of cast iron is taken to the electric steel furnace where 45 t are poured, which will be used with the addition of grapeshot and other metallic materials for the production of 1 50 t of liquid steel; the balance of 20 t of cast iron constitutes the heel for the next cycle.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (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)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Furnace Details (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP50002599A JP2001518145A (ja) | 1997-05-30 | 1998-05-04 | 鉄スポンジからの溶融銑鉄の製造方法及びその実行のための装置 |
| EP98916678A EP0929699A1 (fr) | 1997-05-30 | 1998-05-04 | Procede de production de fonte liquide a partir d'eponge de fer et installation pour sa mise en oeuvre |
| AU70178/98A AU7017898A (en) | 1997-05-30 | 1998-05-04 | Method for producing liquid cast iron from iron sponge and installation for its implementation |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE9700469 | 1997-05-30 | ||
| BE9700469A BE1011186A3 (fr) | 1997-05-30 | 1997-05-30 | Procede de production de fonte liquide a partir d'eponge de fer et installation pour sa mise en oeuvre. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998054368A1 true WO1998054368A1 (fr) | 1998-12-03 |
Family
ID=3890545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/BE1998/000063 Ceased WO1998054368A1 (fr) | 1997-05-30 | 1998-05-04 | Procede de production de fonte liquide a partir d'eponge de fer et installation pour sa mise en oeuvre |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0929699A1 (fr) |
| JP (1) | JP2001518145A (fr) |
| AU (1) | AU7017898A (fr) |
| BE (1) | BE1011186A3 (fr) |
| WO (1) | WO1998054368A1 (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1067381A (fr) * | 1951-12-08 | 1954-06-15 | Procédé d'élaboration du fer et de l'acier directement à partir de minerais | |
| DE2127847A1 (en) * | 1970-06-05 | 1971-12-16 | Gonzalez de,Castejon, Javier , Madrid | Iron smelting - using low-grade ores and coal in low-cost appts |
| FR2262114A1 (fr) * | 1974-02-22 | 1975-09-19 | Voest Ag | |
| DE3300867A1 (de) * | 1983-01-13 | 1984-07-19 | Mannesmann AG, 4000 Düsseldorf | Verfahren zur erzeugung von stahl durch einschmelzen von eisenschwamm im lichtbogenofen |
| EP0117318A1 (fr) * | 1983-02-10 | 1984-09-05 | Metallgesellschaft Ag | Procédé pour la fusion en continu d'éponge de fer |
-
1997
- 1997-05-30 BE BE9700469A patent/BE1011186A3/fr active
-
1998
- 1998-05-04 WO PCT/BE1998/000063 patent/WO1998054368A1/fr not_active Ceased
- 1998-05-04 AU AU70178/98A patent/AU7017898A/en not_active Abandoned
- 1998-05-04 EP EP98916678A patent/EP0929699A1/fr not_active Withdrawn
- 1998-05-04 JP JP50002599A patent/JP2001518145A/ja active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1067381A (fr) * | 1951-12-08 | 1954-06-15 | Procédé d'élaboration du fer et de l'acier directement à partir de minerais | |
| DE2127847A1 (en) * | 1970-06-05 | 1971-12-16 | Gonzalez de,Castejon, Javier , Madrid | Iron smelting - using low-grade ores and coal in low-cost appts |
| FR2262114A1 (fr) * | 1974-02-22 | 1975-09-19 | Voest Ag | |
| DE3300867A1 (de) * | 1983-01-13 | 1984-07-19 | Mannesmann AG, 4000 Düsseldorf | Verfahren zur erzeugung von stahl durch einschmelzen von eisenschwamm im lichtbogenofen |
| EP0117318A1 (fr) * | 1983-02-10 | 1984-09-05 | Metallgesellschaft Ag | Procédé pour la fusion en continu d'éponge de fer |
Also Published As
| Publication number | Publication date |
|---|---|
| AU7017898A (en) | 1998-12-30 |
| EP0929699A1 (fr) | 1999-07-21 |
| JP2001518145A (ja) | 2001-10-09 |
| BE1011186A3 (fr) | 1999-06-01 |
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