EP4073277A1 - Method for determining and controlling or regulating the phosphorus content in a metallic melt during the refining process of a metallic melt in a metallurgical reactor - Google Patents
Method for determining and controlling or regulating the phosphorus content in a metallic melt during the refining process of a metallic melt in a metallurgical reactorInfo
- Publication number
- EP4073277A1 EP4073277A1 EP20833740.2A EP20833740A EP4073277A1 EP 4073277 A1 EP4073277 A1 EP 4073277A1 EP 20833740 A EP20833740 A EP 20833740A EP 4073277 A1 EP4073277 A1 EP 4073277A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- content
- phosphorus
- metallic melt
- phosphorus content
- metallurgical reactor
- 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- Withdrawn
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
-
- 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
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; 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
- C21C2300/00—Process aspects
- C21C2300/06—Modeling of the process, e.g. for control purposes; CII
-
- 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
- Y02P10/25—Process efficiency
Definitions
- the invention relates to a method for determining and controlling or regulating the phosphorus content in a metallic melt during a fresh process of a metallic melt in a metallurgical reactor.
- a steel quality or material properties of a steel are influenced, among other things, by the phosphorus content (% Ps t). It is therefore necessary to keep the average phosphorus content [% P m ] of a steel melt at the end of a refining process in a metallurgical reactor within narrow limits.
- the fresh process of the molten steel must be controlled or regulated within the narrowest possible target corridors.
- An important control or regulation parameter for influencing the average phosphorus content (% P m ) in the steel melt is, for example, an exact tapping time of the metallurgical reactor. A control or regulation of the fresh process in relation to this tapping time influences both the quality of the steel and the productivity of the metallurgical reactor significantly.
- a steel sample is taken from the molten steel and analyzed in a laboratory for the phosphorus content [% P m ].
- the result of this analysis is usually available to a plant operator in 3 - 6 minutes and is a basis for a tapping decision by the plant operator.
- the accuracy of the analysis of a steel sample from the metallurgical reactor is limited by the fact that only a small sample is taken from a defined point. The plant operator can, for example, use his experience of the analysis result to determine the average phosphorus content [% P m ] of the metallic melt.
- the average phosphorus content (% P m ) in the steel melt during or at the end of the refining process is the goal of many investigations. These investigations and developments are based on a relationship between the average phosphorus content [% P m ] in the steel melt and the average iron oxide content (% Fe x O y ) in an associated slag in the metallurgical reactor.
- the mean iron oxide content (% Fe x O y ) in the slag is determined by means of a local measurement of the oxygen activity (ao) in the slag and the assumption that the measurement is representative.
- the mean phosphorus content (% P S ) of the slag is then derived from the mean iron oxide content (% Fe x O y).
- both the mean phosphorus content [% P m ] of the molten steel and a phosphorus distribution LP in the metallurgical reactor can be calculated.
- the calculation of the average phosphorus content (% P S ) in the slag with the help of the measured local oxygen activity ao is flawed because iron (II) oxide (FeO) and iron (III) oxide (FeaC) are present side by side in the slag and a total value for the iron oxide content (% Fe x O y ) is to be determined by measuring the local oxygen activity ao. It is not possible to determine the present Fe 2+ / Fe 3+ ratio in the iron oxide content (% Fe x O y).
- the ratio or the content of iron (II) oxide (FeO) and iron (III) oxide (Fe 2 03) in the slag is not only dependent on the oxygen activity ao but also, for example, on other slag constituents.
- a direct, reliable determination of the FeO content or Fe 2+ content and thus the reliable determination of the average phosphorus content [% P m ] in the steel melt is therefore not possible or at least provided with an uncertainty by measuring the local oxygen activity .
- the results of the measurement of the oxygen activity are ao strongly dependent on the position of the sensor in the slag.
- the oxygen activity ao is very high due to the injected oxygen and very low in the area of the CO bubbles resulting from the decarburization reaction.
- the slag is a heterogeneous mixture of solid lime, solid mixed phases, liquid components and gas bubbles. The composition of the slag from the different phase components and distribution in the metallurgical reactor changes significantly in the course of the refining process, so that it is difficult to carry out representative oxygen measurements.
- a slag sample is taken from the metallurgical reactor, typically only the liquid portion of the heterogeneous slag mixture is used taken and sampled.
- the slag sample is therefore not a reliable basis for determining the phosphorus content (% Ps) in the slag, since solid phosphorus phases, for example, are not taken and are therefore neglected in the phosphorus determination.
- the object to be solved by the invention consisted in a method which makes it possible to determine a phosphorus content [% P m ] in a metallic melt with sufficient reliability and / or without delay and to control or regulate the fresh process to set the desired average phosphorus content [ % P m ] to be provided.
- Invention :
- the object of the invention is achieved by the features of the method according to the invention according to claim 1 for determining a phosphorus content [% P m ] in a metallic melt.
- the local manganese content [% Mn m ] in the metallic melt is determined and the local manganese content [% Mn m ] becomes a phosphorus content (% P m ) of the metallic melt and / or a phosphorus distribution LP im metallurgical reactor derived from a model.
- the determined manganese content is determined taking into account system parameters, other measured values, for example temperature, exhaust gas composition and / or other process or system-related Assumptions converted into a phosphorus distribution.
- a fresh process of a metallic melt in a metallurgical reactor is dependent on the phosphorus content [% P m ] of the metallic melt and / or the phosphorus distribution LP in the metallurgical reactor controlled or regulated and from the manganese content [% Mn m ] of the metallic melt, the phosphorus content [% P m ] of the metallic melt and / or a phosphorus distribution LP in the metallurgical reactor is derived by means of a model.
- the derivation of the phosphorus content [% P m ] in the metallic melt by means of a model offers the advantages mentioned above for the accuracy of the determination of the phosphorus content [% P m ] by taking into account the known influences.
- a system operator is provided with a reliable instrument for control or regulation with the negative Influences on the steel quality can be avoided while at the same time optimizing productivity.
- reaction kinetic, thermodynamic, statistically determined relationships, measured values and / or reactor-specific system parameters can be taken into account as influences.
- reaction kinetic, thermodynamic, statistically determined relationships, measured values and / or reactor-specific system parameters can be taken into account as influences.
- the derivation and consideration of these two parameters is also important for the productivity of the metallurgical reactor and the quality of the metallic melt.
- the phosphorus content [% P m ] and / or the phosphorus distribution LP is continuously derived by means of a continuous measurement of the manganese content [% Mn m] of the metallic melt and used for continuous regulation or control.
- this version has the advantage that deviations in the process can be quickly recognized and responded to.
- the metallic melt advantageously has iron [Fe] as its main component.
- an iron content [% Fe m ] in the metallic melt of more than 30% is preferred.
- the metallurgical reactor is a converter.
- the manganese content [% Mn m ] is ideally determined continuously and / or online using a spectrometer or LIBS (laser-induced breakdown spectroscopy).
- the determined manganese content [% Mn m ] is converted into a phosphorus content [% P m ] of the metallic melt and / or a phosphorus distribution LP in the metallurgical reactor with the aid of further relationships and / or influencing variables.
- the relationships taken into account when deriving the phosphorus content [% P m ] describe, for example, the relationship between a manganese content [% Mn m ] at a specific measuring point in the metallurgical reactor compared to the average manganese content [% Mn m ] the metallic melt in the metallurgical reactor. Furthermore, time-dependent effects can be taken into account or suppressed with the aid of thermodynamic or reaction kinetic relationships.
- the model can be adapted to the respective metallurgical reactor and furthermore, for example, changes in the reactor over time, such as wear and / or
- the relationships and / or influencing variables are determined in advance and the model is integrated into the control or regulation of the fresh process.
- the advantageous continuous measurement of the manganese content [% Mn m ] enables the model to continuously calculate a phosphorus content [% P m ]. This enables online or continuous control or regulation of the process.
- time-dependent relationships and influencing variables have been determined in advance to make it possible
- the model is used to derive the average phosphorus content [% P m ] of the metallic melt from the manganese content [% Mn m ] and the average phosphorus content [% P m ] is the control or regulating variable of the control or regulation of the metallurgical Reactor. This has the advantage that the control or regulation can take place without the experience of a system operator. In addition, it is conceivable, by making appropriate changes to the model, to convert both local contents into mean and mean into local contents.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019219623.3A DE102019219623A1 (en) | 2019-12-13 | 2019-12-13 | Method for determining and controlling or regulating the phosphorus content in a metallic melt during a fresh process of a metallic melt in a metallurgical reactor |
PCT/EP2020/085604 WO2021116324A1 (en) | 2019-12-13 | 2020-12-10 | Method for determining and controlling or regulating the phosphorus content in a metallic melt during the refining process of a metallic melt in a metallurgical reactor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4073277A1 true EP4073277A1 (en) | 2022-10-19 |
Family
ID=74105978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20833740.2A Withdrawn EP4073277A1 (en) | 2019-12-13 | 2020-12-10 | Method for determining and controlling or regulating the phosphorus content in a metallic melt during the refining process of a metallic melt in a metallurgical reactor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP4073277A1 (en) |
DE (1) | DE102019219623A1 (en) |
WO (1) | WO2021116324A1 (en) |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE786791A (en) * | 1971-07-27 | 1973-01-26 | Uss Eng & Consult | STEEL PROCESSING TECHNOLOGY |
AT336053B (en) * | 1974-01-15 | 1977-04-12 | Voest Ag | STATIC PROCESS FOR CONTROLLING THE FRESH REACTIONS OF STEEL IRON IN AN OXYGEN INFLATION CONVERTER |
-
2019
- 2019-12-13 DE DE102019219623.3A patent/DE102019219623A1/en active Pending
-
2020
- 2020-12-10 EP EP20833740.2A patent/EP4073277A1/en not_active Withdrawn
- 2020-12-10 WO PCT/EP2020/085604 patent/WO2021116324A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
WO2021116324A1 (en) | 2021-06-17 |
DE102019219623A1 (en) | 2021-06-17 |
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