CA2674131A1 - Process and plant for producing steel - Google Patents
Process and plant for producing steel Download PDFInfo
- Publication number
- CA2674131A1 CA2674131A1 CA002674131A CA2674131A CA2674131A1 CA 2674131 A1 CA2674131 A1 CA 2674131A1 CA 002674131 A CA002674131 A CA 002674131A CA 2674131 A CA2674131 A CA 2674131A CA 2674131 A1 CA2674131 A1 CA 2674131A1
- Authority
- CA
- Canada
- Prior art keywords
- converter
- steel
- slag
- pig iron
- metal product
- 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.)
- Abandoned
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
- 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
- C21C5/36—Processes yielding slags of special composition
-
- 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
-
- 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
- C21C5/285—Plants therefor
-
- 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
- C21C2300/00—Process aspects
- C21C2300/08—Particular sequence of the process steps
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5252—Manufacture of steel in electric furnaces in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Botany (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a process for producing steel and for obtaining slag with a high content of additional elements such as vanadium in a two-stage process, wherein liquid pig iron at a relatively low temperature is first blown onto a high-grade slag, which after tapping is further processed separately, while the pig iron is fed to at least one further converter, in which it is blown at a higher temperature to form steel. The intention is to produce a high-grade slag and to shorten the production process for the steel. This is achieved in terms of the process by the intermediate metal product that is tapped from the first converter being subjected to a heating and/or holding phase before being fed into the second converter.
Description
PROCESS AND PLANT FOR PRODUCING STEEL
The invention is directed to a process and an installation for producing steel and for obtaining slag having a high content of additional elements such as vanadium in a two-step process, wherein the liquid pig iron is initially blown onto a high-grade slag at a lower temperature, the slag being further processed separately after tapping, while the pig iron is supplied to at least one additional converter in which it is blown at a higher temperature to form steel.
The processing times in the first converter in which the high-grade slag is generated are substantially shorter than those for producing the steel in the second converter stage. In order to overcome this disadvantage without having to set aside a waiting time to compensate for the different cycles, two converters are often used in practice in this second processing step.
Another problem which must be considered is that the working temperature in the first step is approximately 14000 C, while the temperature in the steel production step is approximately 1680 C.
Accordingly, whereas waiting times inevitably occur between the first, faster step and the second step in a two-step installation, the installation with two converters in tandem does not make full use of the working capacity of the two converters of the second stage for production of steel.
Apart from this, the total investment costs for two converters in the second stage are naturally higher.
Finally, there are other disadvantages with respect to the process in the installation having only one converter per step because the required waiting time before the second converter can be charged, that is, before this second converter is unoccupied again, leads to loss of production and, in some cases, also considerable problems for the melt because of the inevitable freezing to the transfer vessel.
Therefore, it is the object of the invention to provide a process and an installation which overcome the above-mentioned disadvantages and by which a high-grade slag can be produced on the one hand and the entire steel production process can be shortened on the other hand.
In a process in which the liquid pig iron is initially blown onto a high-grade slag at a lower temperature, the slag being further processed separately after tapping, while the pig iron is supplied to at least one additional converter in which it is blown at a higher temperature to form steel, the above-stated object is met according to the invention in that the intermediate metal product that is tapped from the first converter is subjected to a heating and/or holding phase before being supplied to the second converter.
The heating andlor holding is carried out by metered injection of oxygen.
With respect to the installation, the above-stated object is met according to the invention through the use of a heating stand having an oxygen injection device such as an oxygen lance.
As a result of the process according to the invention, the cycle times between blowing in the first converter and the production of the pig iron in the second converter, which proceeds substantially more slowly, are rendered insignificant because this time period can be bridged in the heating stand.
By supplying oxygen by means of a blowing lance, a portion of the carbon contained in the intermediate metal product is burnt off. The amount of injected oxygen can now be variously metered; specifically, it is possible merely to maintain the temperature during the waiting cycle, that is, to compensate for temperature losses which occur normally.
But, on the other hand, a larger amount of oxygen can also be supplied. In this way, the blowing process in the subsequent converter can be shortened because of the higher carbon burnoff. At the same time, however, the higher burnoff of carbon raises the temperature of the melt so that the higher temperature of about 1680 C for the second blowing process can be reached already when transferring to the second converter. Also, this substantially reduces the treatment time in this second blowing step.
Because of the resulting overall reduction in treatment time in the installation, productivity can be substantially increased at comparatively lower installation costs compared to an installation with three converters which is limited by the required cycle compensation.
The invention will be described in the following with reference to the drawings.
The invention is directed to a process and an installation for producing steel and for obtaining slag having a high content of additional elements such as vanadium in a two-step process, wherein the liquid pig iron is initially blown onto a high-grade slag at a lower temperature, the slag being further processed separately after tapping, while the pig iron is supplied to at least one additional converter in which it is blown at a higher temperature to form steel.
The processing times in the first converter in which the high-grade slag is generated are substantially shorter than those for producing the steel in the second converter stage. In order to overcome this disadvantage without having to set aside a waiting time to compensate for the different cycles, two converters are often used in practice in this second processing step.
Another problem which must be considered is that the working temperature in the first step is approximately 14000 C, while the temperature in the steel production step is approximately 1680 C.
Accordingly, whereas waiting times inevitably occur between the first, faster step and the second step in a two-step installation, the installation with two converters in tandem does not make full use of the working capacity of the two converters of the second stage for production of steel.
Apart from this, the total investment costs for two converters in the second stage are naturally higher.
Finally, there are other disadvantages with respect to the process in the installation having only one converter per step because the required waiting time before the second converter can be charged, that is, before this second converter is unoccupied again, leads to loss of production and, in some cases, also considerable problems for the melt because of the inevitable freezing to the transfer vessel.
Therefore, it is the object of the invention to provide a process and an installation which overcome the above-mentioned disadvantages and by which a high-grade slag can be produced on the one hand and the entire steel production process can be shortened on the other hand.
In a process in which the liquid pig iron is initially blown onto a high-grade slag at a lower temperature, the slag being further processed separately after tapping, while the pig iron is supplied to at least one additional converter in which it is blown at a higher temperature to form steel, the above-stated object is met according to the invention in that the intermediate metal product that is tapped from the first converter is subjected to a heating and/or holding phase before being supplied to the second converter.
The heating andlor holding is carried out by metered injection of oxygen.
With respect to the installation, the above-stated object is met according to the invention through the use of a heating stand having an oxygen injection device such as an oxygen lance.
As a result of the process according to the invention, the cycle times between blowing in the first converter and the production of the pig iron in the second converter, which proceeds substantially more slowly, are rendered insignificant because this time period can be bridged in the heating stand.
By supplying oxygen by means of a blowing lance, a portion of the carbon contained in the intermediate metal product is burnt off. The amount of injected oxygen can now be variously metered; specifically, it is possible merely to maintain the temperature during the waiting cycle, that is, to compensate for temperature losses which occur normally.
But, on the other hand, a larger amount of oxygen can also be supplied. In this way, the blowing process in the subsequent converter can be shortened because of the higher carbon burnoff. At the same time, however, the higher burnoff of carbon raises the temperature of the melt so that the higher temperature of about 1680 C for the second blowing process can be reached already when transferring to the second converter. Also, this substantially reduces the treatment time in this second blowing step.
Because of the resulting overall reduction in treatment time in the installation, productivity can be substantially increased at comparatively lower installation costs compared to an installation with three converters which is limited by the required cycle compensation.
The invention will be described in the following with reference to the drawings.
Fig. I is a schematic diagram showing the process flow in an installation according to the invention with a heating stand;
Fig. 2 is a schematic view of the heating stand;
Fig. 3 shows a two-step installation according to the prior art with three converters;
and Fig. 4 shows a corresponding installation with two converters.
Figures 3 and 4 show that the liquid pig iron is initially blown in the converter 1 with the aim of achieving a high-grade slag. The temperature is approximately 1400 C. After tapping the slag which is then fed to a refining step, the intermediate metal product is fed after a compulsory waiting period to two converters 2 and 3, where it is blown at approximately 16800 C to form crude steel which is then subjected to further treatment, for example, in a vacuum installation.
As was already mentioned above, the two converters in tandem in an installation of this kind can often not reach the working capacity of these converters. This disadvantage does not occur in the installation shown in Figure 4, but in this case the waiting times required for adapting the blowing cycle of the first converter to the second converter constitute a significant, negative factor.
This disadvantage is remedied by the installation according to the invention in which a heating stand is provided between the two converter stages.
Figure 2 is a schematic view showing how this heating stand might look, namely, by way of the example of an installation having two receptacles for transfer vessels. The left-hand side of the drawing shows the transfer vessel with the intermediate metal product contained therein in the blowing position in which oxygen is supplied or injected through a lance. The right-hand side of the drawing shows a transfer vessel which can be closed by a cover.
Fig. 2 is a schematic view of the heating stand;
Fig. 3 shows a two-step installation according to the prior art with three converters;
and Fig. 4 shows a corresponding installation with two converters.
Figures 3 and 4 show that the liquid pig iron is initially blown in the converter 1 with the aim of achieving a high-grade slag. The temperature is approximately 1400 C. After tapping the slag which is then fed to a refining step, the intermediate metal product is fed after a compulsory waiting period to two converters 2 and 3, where it is blown at approximately 16800 C to form crude steel which is then subjected to further treatment, for example, in a vacuum installation.
As was already mentioned above, the two converters in tandem in an installation of this kind can often not reach the working capacity of these converters. This disadvantage does not occur in the installation shown in Figure 4, but in this case the waiting times required for adapting the blowing cycle of the first converter to the second converter constitute a significant, negative factor.
This disadvantage is remedied by the installation according to the invention in which a heating stand is provided between the two converter stages.
Figure 2 is a schematic view showing how this heating stand might look, namely, by way of the example of an installation having two receptacles for transfer vessels. The left-hand side of the drawing shows the transfer vessel with the intermediate metal product contained therein in the blowing position in which oxygen is supplied or injected through a lance. The right-hand side of the drawing shows a transfer vessel which can be closed by a cover.
Claims (5)
1. Process for producing steel and for obtaining slag having a high content of additional elements such as vanadium in a two-step process, wherein liquid pig iron is initially blown onto a high-grade slag at a lower temperature, the slag being further processed separately after tapping, while the pig iron is supplied to at least one additional converter in which it is blown at a higher temperature to form steel, characterized in that the intermediate metal product that is tapped from the first converter is subjected to a heating and/or holding phase before being supplied to the second converter.
2. Process according to claim 1, characterized in that the intermediate metal product is heated during the holding phase by injecting oxygen.
3. Installation for implementing the process according to one of the preceding claims, characterized by a first converter for blowing liquid pig iron, at least one additional converter for receiving the intermediate metal product that is tapped from the first converter and for producing crude steel, and a heating stand between the first converter and the second converter in which the transfer vessel transferring the intermediate metal product from the first converter to the second converter can be stationed.
4. Installation according to claim 3, characterized in that the heating stand is designed to receive a plurality of transfer vessels.
5. Installation according to one of the preceding claims 3 to 4, characterized in that a device for injecting oxygen into the transfer vessel is provided in the heating stand.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007001098A DE102007001098A1 (en) | 2007-01-04 | 2007-01-04 | Process and plant for the production of steel |
| DE102007001098.4 | 2007-01-04 | ||
| PCT/DE2007/002236 WO2008080379A1 (en) | 2007-01-04 | 2007-12-10 | Process and plant for producing steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2674131A1 true CA2674131A1 (en) | 2008-07-10 |
Family
ID=39232915
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002674131A Abandoned CA2674131A1 (en) | 2007-01-04 | 2007-12-10 | Process and plant for producing steel |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20100064856A1 (en) |
| EP (1) | EP2108049B1 (en) |
| JP (1) | JP5144681B2 (en) |
| KR (1) | KR20090085156A (en) |
| CN (1) | CN101573457B (en) |
| CA (1) | CA2674131A1 (en) |
| DE (1) | DE102007001098A1 (en) |
| RU (1) | RU2418073C2 (en) |
| TW (1) | TW200848518A (en) |
| UA (1) | UA93610C2 (en) |
| WO (1) | WO2008080379A1 (en) |
| ZA (1) | ZA200903500B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014222727A1 (en) * | 2014-11-06 | 2016-05-12 | Sms Group Gmbh | Method and device for producing a stainless steel |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3484088A (en) * | 1966-06-03 | 1969-12-16 | Impianti Spa Soc It | Multi-converters pneumatic steelmaking plant |
| JPS5423017A (en) | 1977-07-23 | 1979-02-21 | Sumitomo Metal Ind Ltd | Manufacture of low phosphorus steel |
| AT382639B (en) * | 1985-04-26 | 1987-03-25 | Voest Alpine Ag | METHOD FOR PRODUCING STEEL FROM SPONGE OF IRON, AND SYSTEM FOR IMPLEMENTING THE METHOD |
| DE3530043A1 (en) | 1985-08-22 | 1987-02-26 | Linde Ag | METHOD AND DEVICE FOR KEEPING A MEL IN A PAN |
| DE3575949D1 (en) * | 1985-08-22 | 1990-03-15 | Ural Nii Cernych Metallov | METHOD FOR PRODUCING VANADIUM SLAG. |
| SU1425213A1 (en) * | 1986-01-10 | 1988-09-23 | Уральский научно-исследовательский институт черных металлов | Method of converter treatment of vanadium pig iron in duplex process |
| FR2664516B1 (en) * | 1990-07-13 | 1993-06-18 | Air Liquide | TEMPERATURE MAINTAINING AND METALLURGICAL TREATMENT OVEN. |
| RU2118376C1 (en) * | 1997-07-14 | 1998-08-27 | Александров Борис Леонидович | Method of producing vanadium slag and naturally vanadium-alloyed steel |
| RU2194079C2 (en) * | 2000-11-15 | 2002-12-10 | Открытое акционерное общество "Нижнетагильский металлургический комбинат" | Method of melting steel in converter |
| JP3776778B2 (en) * | 2001-09-26 | 2006-05-17 | 株式会社神戸製鋼所 | Method of removing vanadium from molten iron |
| WO2005094360A2 (en) * | 2004-03-29 | 2005-10-13 | Gerdau Ameristeel Us, Inc | High strength steel |
| DE102005032929A1 (en) * | 2004-11-12 | 2006-05-18 | Sms Demag Ag | Production of stainless steel of the ferritic steel group AISI 4xx in an AOD converter |
| CN100427630C (en) * | 2005-12-29 | 2008-10-22 | 攀枝花钢铁(集团)公司 | Production method of high-strength atmospheric corrosion resistant section steel |
| JP5423017B2 (en) * | 2009-01-30 | 2014-02-19 | 三菱樹脂株式会社 | Roll and manufacturing method thereof |
-
2007
- 2007-01-04 DE DE102007001098A patent/DE102007001098A1/en not_active Withdrawn
- 2007-12-10 EP EP07856087A patent/EP2108049B1/en active Active
- 2007-12-10 KR KR1020097013789A patent/KR20090085156A/en not_active Ceased
- 2007-12-10 RU RU2009129676/02A patent/RU2418073C2/en not_active IP Right Cessation
- 2007-12-10 CN CN200780048952.9A patent/CN101573457B/en not_active Expired - Fee Related
- 2007-12-10 UA UAA200908162A patent/UA93610C2/en unknown
- 2007-12-10 JP JP2009544358A patent/JP5144681B2/en not_active Expired - Fee Related
- 2007-12-10 WO PCT/DE2007/002236 patent/WO2008080379A1/en not_active Ceased
- 2007-12-10 US US12/522,186 patent/US20100064856A1/en not_active Abandoned
- 2007-12-10 CA CA002674131A patent/CA2674131A1/en not_active Abandoned
- 2007-12-24 TW TW096149772A patent/TW200848518A/en unknown
-
2009
- 2009-05-20 ZA ZA200903500A patent/ZA200903500B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| WO2008080379A1 (en) | 2008-07-10 |
| RU2418073C2 (en) | 2011-05-10 |
| EP2108049B1 (en) | 2013-02-27 |
| US20100064856A1 (en) | 2010-03-18 |
| EP2108049A1 (en) | 2009-10-14 |
| RU2009129676A (en) | 2011-02-10 |
| TW200848518A (en) | 2008-12-16 |
| CN101573457B (en) | 2015-05-20 |
| CN101573457A (en) | 2009-11-04 |
| ZA200903500B (en) | 2010-04-28 |
| DE102007001098A1 (en) | 2008-07-10 |
| KR20090085156A (en) | 2009-08-06 |
| JP2010514942A (en) | 2010-05-06 |
| JP5144681B2 (en) | 2013-02-13 |
| UA93610C2 (en) | 2011-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |
Effective date: 20121210 |