CN117607383A - Method for evaluating matching property of steel slag at end of LF refining - Google Patents
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- 239000002893 slag Substances 0.000 title claims abstract description 171
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 125
- 239000010959 steel Substances 0.000 title claims abstract description 125
- 238000007670 refining Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 36
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 42
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 42
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 34
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 30
- 230000000694 effects Effects 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 25
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 230000009471 action Effects 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000007547 defect Effects 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 description 12
- 230000008569 process Effects 0.000 description 7
- 229910052596 spinel Inorganic materials 0.000 description 5
- 239000011029 spinel Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000003749 cleanliness Effects 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 239000011777 magnesium Substances 0.000 description 3
- -1 magnesium aluminate Chemical class 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/202—Constituents thereof
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/205—Metals in liquid state, e.g. molten metals
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- 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
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Abstract
The invention relates to the technical field of ferrous metallurgy, in particular to a method for evaluating the matching property of steel slag at the end of LF refining, which comprises the following steps: obtaining the content of Al and Si in molten steel and the content of MgO and CaO in slag; determining the activity of each component in the molten steel according to a Wagner equation; calculating CaO-SiO by combining the steel slag balance principle and the slag coexistence theory 2 ‑Al 2 O 3 -the activity of each component in the slag in the MgO quaternary slag system, the equilibrium oxygen content of the slag interface; according to the activity of each component in the slag and the law of conservation of mass, al in balance with the content of Al and Si in molten steel in the slag is calculated 2 O 3 、SiO 2 And will be theoretical Al 2 O 3 、SiO 2 Content and Al in actual slag 2 O 3 、SiO 2 And comparing the contents, and evaluating the matching degree of the steel slag. The method can be used for evaluating whether balance is achieved between slag at the end of refining of actual production steel gradeThe defect caused by steel-slag mismatch is traced to the cost and sources, the production cost of enterprises is reduced, and the direction is indicated for improving the quality of steel.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for evaluating steel slag matching at the end of LF refining.
Background
High quality steel requires more stringent requirements for clean-up, precision, homogenization and grain refining during manufacturing. Whether the steel material cleaning and purifying meets the standard is one of indexes for judging the quality and the performance of the steel material. In the LF refining process, the physicochemical reaction of refining slag and molten steel can play roles in deoxidization, desulfurization, inclusion modification, inclusion adsorption and the like, and the process can effectively improve the cleanliness of the molten steel. The chemical components of the refining slag determine the melting temperature, viscosity, surface tension, alkalinity, low oxidability and other physical and chemical properties of the refining slag, and the refining slag components matched with the molten steel components not only further promote the deoxidation, desulfurization and adsorption of inclusions in the molten steel, but also can effectively inhibit SiO in the steel slag 2 The components have the functions of secondary oxidation of molten steel and the like. Therefore, the evaluation of the matching degree between steel slag at the end of LF refining plays an important role in the backtracking process of unqualified quality and property of steel due to cleanliness, and has guiding significance for the addition of slag in the LF refining process of staff.
Through search, patent publication No.: CN112501390a, a method for designing a refining slag system for removing magnesia-alumina spinel inclusions. The design method comprises the steps of establishing a magnesium aluminate spinel inclusion movement model, obtaining the relation between the displacement of the magnesium aluminate spinel inclusion and time, and judging the state of the magnesium aluminate spinel inclusion; calculating viscosity and interface characteristic conditions of the refining slag system which are required to be met by removing the inclusions with different sizes; drawing a map of the removed dominant region; obtaining the maximum size of unremoved inclusions in steel according to the steel grade requirement, and selecting the viscosity and the surface tension coefficient of target slag according to the dominant removal zone diagram; and respectively calculating to obtain a first refining slag component composition and a second refining slag component composition according to the target slag viscosity and the surface tension coefficient, and taking the intersection of the first refining slag component composition and the second refining slag component composition to determine the target refining slag component composition. The method is favorable for designing refining slag used for removing the magnesia-alumina spinel inclusions, and aims to improve the cleanliness of molten steel. However, the method lacks consideration of the movement time of the inclusions at the steel-slag interface in industrial actual production, and the longer the time is, the greater the probability that the inclusions are reeled into molten steel, and the more difficult the inclusions are to be removed. The method does not mention the matching property of the steel water component and the refining slag component, the viscosity of the refining slag, the melting temperature and other properties, and cannot ensure the influence of the steel slag interface reaction degree on deoxidation, desulfurization and molten steel component adjustment.
Patent publication No.: CN113761477a, a method for constructing slag viscosity prediction and composition control model. The method comprises the steps of selecting a slag component range in advance, and designing a secondary regression orthogonal test scheme through the slag component range to obtain a slag component mass fraction range. And testing the viscosity value of the slag by using a rotary column method, constructing a viscosity parameter equation by using an Arrhenius equation in combination with slag components, constructing a slag viscosity prediction model, and drawing a viscosity contour map. And (3) carrying out XRF component analysis on slag sampling by combining slag volatility, correcting a viscosity prediction model and an isograph, and finally realizing effective control on slag viscosity and components. However, the method uses an empirical slag component design, and slag components are selected in advance, so that whether the molten steel components are matched with the slag components is not considered; secondly, the method only considers the problem of slag viscosity, and a plurality of effective indexes such as slag oxidizing property, melting temperature, alkalinity and the like are not considered, so that the effect is single.
Patent publication No.: CN108875285a, a method for designing components of molten steel refining slag. Firstly, establishing and solving an inclusion motion model at a steel slag interface, quantitatively evaluating the influence of inclusion size, inclusion density, slag phase viscosity, molten steel density, molten steel viscosity and wettability of the inclusion at the steel slag interface on a motion removal process of the inclusion at the steel slag interface, determining a slag phase viscosity range and a slag phase component range when the inclusion can be removed, and simultaneously determining an optimal refining slag component range by combining with control requirements of inclusion target components in steel. The method can control the inclusion components, reduce the number of the inclusions and predetermine the target of the refining slag components required by different steel grades, but ignores the transverse stress and the transverse displacement of the inclusions when considering the stress analysis and the displacement of the inclusions, and prolongs the time after the inclusions enter a slag layer, and still possibly is reeled into molten steel again to increase the displacement parameter error.
In view of the above, we propose a method for evaluating the matching property of steel slag at the end of LF refining, the invention determines the activity of components in molten steel according to specific steel components and Wagner equation, and then calculates the mass action concentration of each component in slag by combining the steel slag balance theory and the slag coexistence theory, thereby obtaining the theoretical balance slag component which is matched with the steel components. Based on the classical theories, calculating theoretical slag components matched with molten steel components, and evaluating whether the actual slag components are matched with the molten steel components by utilizing the theoretical slag components, so that the method has guiding significance on slag component adjustment and slag addition in the refining process in actual production, and is beneficial to reducing the production cost of enterprises and improving the performance and quality of steel products.
Disclosure of Invention
The invention aims to provide a method for evaluating the matching property of steel slag at the end of LF refining, which is characterized in that a steel-slag equilibrium thermodynamic model is constructed according to specific steel type components based on steel-slag equilibrium thermodynamic conditions and combined with Wagner equation and slag structure coexistence theory, and theoretical CaO-Al which is matched with the steel type components best is calculated 2 O 3 -SiO 2 The MgO quaternary slag system slag component aims at defining the problems and the improvement direction existing in the production process, reducing the production cost of enterprises and improving the performance and the quality of steel products.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for evaluating the matching of steel slag at the end of LF refining, comprising the following steps:
s1, obtaining the content of Al and Si in molten steel and the content of MgO and CaO in slag;
s2, calculating the activities of Al and Si elements in the molten steel according to the contents of Al and Si in the step S1 and by combining with a Wagner equation;
s3, calculating the activities of all components in slag and the balanced oxygen content of a steel slag interface according to the activities of Al and Si elements in the molten steel in the step S2 and by combining a steel slag balance principle and a slag coexistence theory;
s4, calculating the balance between the slag and Al and Si in the molten steel according to the activity of the components in the slag calculated in the step S3 and the law of conservation of massAl of (2) 2 O 3 、SiO 2 Content and will be theoretical Al 2 O 3 、SiO 2 Content and Al in actual slag 2 O 3 、SiO 2 And comparing the contents, and evaluating the matching degree of the steel slag.
Preferably, the reaction between aluminum, silicon and oxygen simultaneously occurs at the interface of the steel slag, as shown in the following formula:
wherein,% Al and% Si are the contents of Al and Si in molten steel, and% O is the equilibrium oxygen content of a steel slag interface,f Al 、f Si the activity coefficients of Al and Si elements,f O is the equilibrium oxygen activity of the steel slag interface,、/>is Al 2 O 3 、SiO 2 The mass acting concentration of (3) is determined,K Al 、K Si the equilibrium constant of the chemical reaction of Al and Si elements in molten steel.
Preferably, in the step S3, according to the steel slag balance principle and the slag coexistence theory, the balance mole fraction of each structural unit is defined as the mass action concentration, and the expression is shown in (1):
(1) In N i Is the mass acting concentration of the structural unit, n i Is the equilibrium mole number of the component in the slag,is the total mole number in the slag;
combining each structural unit in the slag, and obtaining the following relational expression (2) by the mole number and the mass action concentration:
N 1 —N 22 CaO-SiO respectively 2 -Al 2 O 3 Mass action concentration, k, of 22 molecules in MgO quaternary slag system 1 —k 18 CaO-SiO respectively 2 -Al 2 O 3 -chemical reaction equilibrium constants of 18 complex molecular compounds in MgO quaternary slag system;
according to the law of conservation of mass, the sum of the mass action concentrations of all the structural units is 1, the following formula can be obtained: n (N) 1 +N 2 +N 3 +...+N 20 +N 21 +N 22 =1（3）。
Preferably, in step S3, the following equation may be formed by combining the Al and Si contents in the molten steel, the relation (2), the equilibrium constant of the chemical reaction, and the equilibrium oxygen content of the steel slag interface:
（4）
（5）
wherein,% Al and% Si are the Al content and the Si content in molten steel, and% O is the equilibrium oxygen content of a steel slag interface; n (N) 3 Is Al 2 O 3 Concentration of N 4 Is SiO 2 The mass action concentration of (2), T is absolute temperature;
obtaining CaO-SiO in an equilibrium state corresponding to the content of Al and Si in the molten steel according to the calculation result 2 -Al 2 O 3 Theoretical Al in MgO quaternary slag system 2 O 3 、SiO 2 Activity.
Compared with the prior art, the invention has the beneficial effects that: the method for evaluating the steel slag matching property at the end of LF refining gives the molten steel component, combines a Wagner equation, a steel slag balancing principle and a molecule-ion slag coexistence theory, calculates slag components balanced with the molten steel component at the end of LF, and judges the matching degree of molten steel and slag at the end of LF refining by comparing the slag components with actual slag components. The method can be used for evaluating whether the balance relation is achieved between the steel slag at the end of refining of the actual production steel grade, tracing the defects caused by the mismatching of the steel and the slag, solving the source, reducing the production cost of enterprises and indicating the direction for improving the quality of the steel.
Drawings
FIG. 1 shows theoretical Al of slag at the end of refining in examples 1 to 62 of the present invention 2 O 3 And actual Al 2 O 3 A comparison chart;
FIG. 2 is a theoretical SiO of the slag at the end of refining in examples 1 to 62 according to the invention 2 And actual SiO 2 A comparison chart;
fig. 3 is a flowchart of a method for evaluating the matching degree of steel slag at the end of LF refining.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides a technical scheme:
a method for evaluating the matching of steel slag at the end of LF refining, comprising the following steps:
s1, obtaining the contents of Al and Si in molten steel and the contents of MgO and CaO in steel slag, and simultaneously generating a reaction between aluminum, silicon and oxygen at a steel slag interface, wherein the reaction is shown in the following formula:
wherein: % Al and Si are the Al and Si contents in molten steel, and% O is the equilibrium oxygen content of the steel slag interface,f Al 、f Si the activity coefficients of Al and Si elements,f O the oxygen activity is balanced for the interface of the steel slag,、/>is Al 2 O 3 、SiO 2 The mass acting concentration of (3) is determined,K Al 、K Si the equilibrium constant of the chemical reaction of Al and Si elements in the molten steel;
s2, calculating the activities of Al and Si elements in the molten steel according to the content in the step S1 and combining a Wagner equation; as can be seen from the existing phase diagram, caO-SiO 2 -Al 2 O 3 22 molecules of CaO and SiO respectively exist in the MgO quaternary slag system 2 、Al 2 O 3 、MgO、CaO·SiO 2 、2CaO·SiO 2 、3CaO·SiO 2 、CaO·Al 2 O 3 、CaO·2Al 2 O 3 、CaO·6Al 2 O 3 、3CaO·Al 2 O 3 、12CaO·7Al 2 O 3 、MgO·SiO 2 、2MgO·SiO 2 、MgO·Al 2 O 3 、CaO·MgO·SiO 2 、CaO·MgO·2SiO 2 、2CaO·MgO·2SiO 2 、3CaO·MgO·2SiO 2 、2CaO·Al 2 O 3 ·SiO 2 、CaO·Al 2 O 3 ·2SiO 2 、3Al 2 O 3 ·2SiO 2 The chemical reaction equilibrium constant calculation process of 18 complex molecular compounds in the above molecules is as follows by combining with a Gibbs free energy calculation formula and an empirical formula:
wherein: r is a gas constant; t is absolute temperature, and the Gibbs free energy parameter in the formula is obtained according to the 'computational thermodynamics of metallurgical melt and solution'.
S3, calculating the activities of all components in slag and the balanced oxygen content of a steel slag interface according to the activities of Al and Si elements in the molten steel in the step S2 and by combining a steel slag balance principle and a slag coexistence theory; according to the balance principle of steel slag and the coexistence theory of slag, the balance mole fraction of each structural unit is defined as mass action concentration,
the expression is shown as (1):
（1）
in N i Is the mass acting concentration of the structural unit, n i Is the equilibrium mole number of the component in the slag,is the total mole number in the slag;
combining each structural unit in the slag, and obtaining the following relation formula by the mole number and the mass action concentration:
N 1 —N 22 CaO-SiO respectively 2 -Al 2 O 3 Mass action concentration, k, of 22 molecules in MgO quaternary slag system 1 —k 18 CaO-SiO respectively 2 -Al 2 O 3 -chemical reaction equilibrium constants of 18 complex molecular compounds in MgO quaternary slag system;
according to the law of conservation of mass, the sum of the mass action concentrations of all the structural units is 1, the following formula can be obtained: n (N) 1 +N 2 +N 3 +...+N 20 +N 21 +N 22 =1 （3）。
The following equation can be formed by combining the Al and Si contents in the molten steel, the relation (2), the chemical reaction equilibrium constant and the steel slag interface equilibrium oxygen content:
（4）
（5）
wherein,% Al,% Si is the content of Al and Si in molten steel,% O is the interfacial equilibrium oxygen content of steel slag, and N 3 Is Al 2 O 3 Concentration of N 4 Is SiO 2 Is the mass action concentration of TAbsolute temperature.
Obtaining CaO-SiO in an equilibrium state corresponding to the content of Al and Si in the molten steel according to the calculation result 2 -Al 2 O 3 Theoretical Al in MgO quaternary slag system 2 O 3 、SiO 2 Activity.
S4, calculating Al balanced with Al and Si in molten steel according to the activity of the components in the slag calculated in the step S3 and by combining with a mass conservation law 2 O 3 、SiO 2 Content and will be theoretical Al 2 O 3 、SiO 2 Content and Al in actual slag 2 O 3 、SiO 2 Comparing the contents, and evaluating the matching degree of the steel slag; the mole numbers of the components in 100g of slag are respectively defined asI.e. +.> （6）
By combining the formulas (1) and (2),
the above formula is referred to EISENH Ü TTENLEUTE, V D, ALLIBERT M, slag Atlas, england: woodhead Publishing Ltd Press, 1995.
Since the Al and Si contents in the molten steel and the MgO and CaO contents in the steel slag are known, simultaneous equations (3), (4), (5) and (6) can be obtainedFurther, a +.>The equilibrium mass fraction can be obtained by multiplying the corresponding molar mass by the values, respectively, as shown in equations (11) and (12):
（11）
（12）
the CaO-SiO in the equilibrium state can be obtained according to the calculation result 2 -Al 2 O 3 Theoretical Al in MgO quaternary slag system 2 O 3 、SiO 2 Content and will be theoretical Al 2 O 3 、SiO 2 Content and Al in actual slag 2 O 3 、SiO 2 And comparing the contents, and evaluating the matching degree of the steel slag.
Table 1 shows the molten steel composition, actual slag composition, and theoretical slag composition parameters of examples 1 to 34.
Table 2 shows the molten steel composition, actual slag composition, and theoretical slag composition parameters of examples 35 to 62.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that the above-described embodiments and descriptions are only preferred embodiments of the present invention, and are not intended to limit the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A method for evaluating the matching of steel slag at the end of LF refining, which is characterized by comprising the following steps:
s1, obtaining the content of Al and Si in molten steel and the content of MgO and CaO in slag;
s2, calculating the activities of Al and Si elements in the molten steel according to the contents of Al and Si in the step S1 and by combining with a Wagner equation;
s3, calculating the activities of all components in slag and the balanced oxygen content of a steel slag interface according to the activities of Al and Si elements in the molten steel in the step S2 and by combining a steel slag balance principle and a slag coexistence theory;
s4, calculating Al balanced with Al and Si in molten steel according to the activity of the components in the slag calculated in the step S3 and by combining with a mass conservation law 2 O 3 、SiO 2 Content and will be theoretical Al 2 O 3 、SiO 2 Content and Al in actual slag 2 O 3 、SiO 2 And comparing the contents, and evaluating the matching degree of the steel slag.
2. The method for evaluating the matching of steel slag at the end of LF refining according to claim 1, wherein the reaction between aluminum, silicon and oxygen occurs simultaneously at the steel slag interface, as shown in the following formula:
；
wherein,% Al and% Si are the contents of Al and Si in molten steel, and% O is the equilibrium oxygen content of a steel slag interface,f Al 、f Si the activity coefficients of Al and Si elements,f O is the equilibrium oxygen activity of the steel slag interface,、/>is Al 2 O 3 、SiO 2 The mass acting concentration of (3) is determined,K Al 、K Si the equilibrium constant of the chemical reaction of Al and Si elements in molten steel.
3. The method for evaluating the matching property of the steel slag at the end of the LF refining as set forth in claim 2, wherein in the step S3, the equilibrium mole fraction of each structural unit is defined as the mass action concentration according to the steel slag equilibrium principle and the slag coexistence theory, and the expression is as shown in (1):
（1）；
in N i Is the mass acting concentration of the structural unit, n i Is the equilibrium mole number of the component in the slag,is the total mole number in the slag;
combining each structural unit in the slag, and obtaining the following relational expression (2) by the mole number and the mass action concentration:
；
N 1 —N 22 CaO-SiO respectively 2 -Al 2 O 3 Mass action concentration, k, of 22 molecules in MgO quaternary slag system 1 —k 18 CaO-SiO respectively 2 -Al 2 O 3 -chemical reaction equilibrium constants of 18 complex molecular compounds in MgO quaternary slag system;
according to the law of conservation of mass, the sum of the mass action concentrations of all the structural units is 1, the following formula can be obtained: n (N) 1 +N 2 +N 3 +...+N 20 +N 21 +N 22 =1 （3）。
4. The method for evaluating the matching property of steel slag at the end of LF refining according to claim 3, wherein in the step S3, the following equation is formed by combining Al and Si contents in molten steel, the relation (2), the equilibrium constant of chemical reaction and the equilibrium oxygen content of steel slag interface:
（4）
（5）
wherein,% Al and% Si are the Al content and the Si content in molten steel, and% O is the equilibrium oxygen content of a steel slag interface; n (N) 3 Is Al 2 O 3 Concentration of N 4 Is SiO 2 The mass action concentration of (2), T is absolute temperature; obtaining CaO-SiO in an equilibrium state corresponding to the content of Al and Si in the molten steel according to the calculation result 2 -Al 2 O 3 Theoretical Al in MgO quaternary slag system 2 O 3 、SiO 2 Activity.
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| US11326217B1 (en) * | 2020-11-10 | 2022-05-10 | University Of Science And Technology Beijing | Method and system for predicting addition amount of slagging lime during LF refining, and LF refining method |
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| CN102534066A (en) * | 2011-12-13 | 2012-07-04 | 河南科技大学 | High-temperature molten steel slag treating method |
| US11326217B1 (en) * | 2020-11-10 | 2022-05-10 | University Of Science And Technology Beijing | Method and system for predicting addition amount of slagging lime during LF refining, and LF refining method |
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