CN117683962A - Method for predicting FeO content of converter final slag - Google Patents
Method for predicting FeO content of converter final slag Download PDFInfo
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- CN117683962A CN117683962A CN202311694438.XA CN202311694438A CN117683962A CN 117683962 A CN117683962 A CN 117683962A CN 202311694438 A CN202311694438 A CN 202311694438A CN 117683962 A CN117683962 A CN 117683962A
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- 239000002893 slag Substances 0.000 title claims abstract description 157
- 238000000034 method Methods 0.000 title claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 122
- 239000010959 steel Substances 0.000 claims abstract description 122
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000007664 blowing Methods 0.000 claims abstract description 73
- 229910052742 iron Inorganic materials 0.000 claims abstract description 52
- 238000012360 testing method Methods 0.000 claims abstract description 36
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 24
- 230000003647 oxidation Effects 0.000 claims abstract description 24
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 63
- 239000000463 material Substances 0.000 claims description 47
- 239000011572 manganese Substances 0.000 claims description 29
- 239000010936 titanium Substances 0.000 claims description 25
- 238000001816 cooling Methods 0.000 claims description 15
- 239000011777 magnesium Substances 0.000 claims description 14
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 13
- 239000002826 coolant Substances 0.000 claims description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052698 phosphorus Inorganic materials 0.000 claims description 12
- 239000011574 phosphorus Substances 0.000 claims description 12
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 11
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 11
- 239000011575 calcium Substances 0.000 claims description 11
- 229910052710 silicon Inorganic materials 0.000 claims description 11
- 239000010703 silicon Substances 0.000 claims description 11
- 229910052748 manganese Inorganic materials 0.000 claims description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 9
- 229910052719 titanium Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 5
- 239000011593 sulfur Substances 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 4
- 238000009628 steelmaking Methods 0.000 claims description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 235000012255 calcium oxide Nutrition 0.000 claims description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 2
- 239000001569 carbon dioxide Substances 0.000 claims description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims 2
- 238000002844 melting Methods 0.000 claims 2
- 230000008018 melting Effects 0.000 claims 2
- 239000002994 raw material Substances 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 abstract description 2
- 238000003556 assay Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 238000007670 refining Methods 0.000 description 10
- 238000003723 Smelting Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 3
- 238000010079 rubber tapping Methods 0.000 description 3
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 201000004569 Blindness Diseases 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Abstract
The invention relates to a method for predicting FeO content of converter slag, which specifically comprises the following steps: collecting field actual production data; calculating the initial steel liquid amount and the slag amount in the post-blowing stage; calculating the heat required to be provided by the temperature rise of the post-blowing process (blowing process from TSC process test to TSO end point test); calculating the heat generated by oxidation of carbon element in the back blowing process; calculating the temperature rise and heat release of iron oxidation required in the back blowing process; calculating the amount of iron oxidized into FeO in molten steel; the FeO content in the slag was calculated. The method has the beneficial effects that the problems of high FeO assay hysteresis in the slag and high assay cost are solved, the accurate calculation of slag components is facilitated, and the guiding effect on the subsequent addition of the slag forming agent is achieved.
Description
Technical Field
The invention relates to the field of converter steelmaking, in particular to a prediction method for predicting the FeO content in converter final slag.
Background
Steelmaking, i.e., slag, proper slag composition and precise control of the smelting process have been pursuing goals for metallurgical workers. For the modern steelmaking technology, slag and metal melt are accompanied with each other from primary smelting to refining to solidification and forming, and play important metallurgical functions. Particularly, in the refining step, the refining slag is accompanied with molten steel from the start of tapping from a converter to the end of casting, and is important for controlling the quality and stability of molten steel.
The requirements of various industries on steel quality are higher and higher, and the requirements on the control precision and cleanliness of molten steel chemical components are higher and higher, so that the requirements on metallurgical slag, particularly the metallurgical functions of the refining slag, are higher and higher.
For quality control of high-quality steel, the explicitly-adapted refining slag system is far from enough, and accurate, rapid and stable control of the components of the refining slag is also important to realize the metallurgical functions of the refining slag. The refining slag is formed by a converter oxidizing slag system (CaO-SiO) 2 -Fe x O-MeO x ) To a reducing slag system (CaO-SiO) 2 -Al 2 O 3 -MeO x ) Is converted into the product. In actual production, slag is unavoidable in the tapping process of a converter, slag forming targets are required to be accurately realized, parameters such as slag forming amount, final slag components and the like are required to be obtained, however, due to the fact that detection means are missing or lagged, the parameters cannot be timely and effectively obtained, so that slag forming agents are often added empirically, the slag forming agents have great blindness, the refined slag components are difficult to quickly and accurately hit targets, and the quality and uniformity of molten steel are directly affected.
CaO, mgO, siO in the final slag component of the converter 2 The amount of the alloy can be obtained according to the addition amount of the slag former and chemical reaction, but for FeO components, the content influence factors are complex, the alloy is not only related to the manganese content of the smelting end point of the converter, but also influenced by the operation of the end point of the converter, and the accuracy prediction difficulty is high. At present, the final slag components of the converter are mainly calculated through an empirical formula, the physical meaning is undefined, and the deviation is large.
Disclosure of Invention
First, the technical problem to be solved
In view of the above-mentioned shortcomings and disadvantages of the prior art, the invention provides a method for calculating the FeO content of converter final slag, which solves the technical problems that the prediction accuracy of an empirical formula is poor and the method cannot be applied to actual production due to direct detection data lag.
(II) technical scheme
In order to achieve the above purpose, the invention mainly provides a method for predicting the FeO content of converter final slag, which mainly comprises the following steps:
s1, acquiring molten iron and scrap steel data of a current smelting heat, acquiring material consumption data in a smelting process, and acquiring TSC and TSO test data;
s2, calculating the initial molten steel and slag quantity in the post-blowing stage;
s3, calculating heat required to be provided by heating in a post-blowing process (a middle converting process from TSC test to TSO test);
s4, calculating the heat generated by oxidization of carbon elements in the back blowing process;
s5, calculating the temperature rise and heat release of iron oxidation required in the back blowing process;
s6, calculating the amount of iron oxidized into FeO in the molten steel;
s7, calculating the final slag quantity;
s8, calculating the FeO content in the final slag.
(III) beneficial effects
According to the method for predicting the FeO content of the final slag of the converter, the content of the FeO of the final slag of the converter is calculated according to the TSC data, the TSO data, the process charging and other real-time data measured in the smelting process, and further, the addition amount of a slag former can be calculated according to the FeO content of the final slag of the converter, so that ladle slag modification operation of tapping steel of the converter is guided, the hit rate of target components of refining slag is improved, and further, the quality of molten steel and refining efficiency are improved.
Drawings
FIG. 1 is a schematic flow chart of a method for predicting FeO content of final slag of a converter according to an embodiment of the invention;
FIG. 2 is a schematic flow chart of calculating FeO content of final slag of a converter according to an embodiment of the present invention;
FIG. 3 is a graph showing the comparison between the FeO content prediction and the actual test data of the final slag of the converter according to an embodiment of the present invention;
Detailed Description
The invention will be better explained by the following detailed description of the embodiments with reference to the drawings.
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The specific implementation is as follows:
s1, acquiring molten iron and scrap steel data of a current smelting heat, acquiring material consumption data in a smelting process, and acquiring TSC and TSO test data;
s2, calculating the initial molten steel and slag quantity in the post-blowing stage;
s3, calculating heat required to be provided by heating in a post-blowing process (a middle converting process from TSC test to TSO test);
s4, calculating the heat generated by oxidization of carbon elements in the back blowing process;
s5, calculating the temperature rise and heat release of iron oxidation required in the back blowing process;
s6, calculating the amount of iron oxidized into FeO in the molten steel;
s7, calculating the final slag quantity;
s8, calculating the FeO content in the final slag.
S1, collecting actual production data of a steel mill, wherein the required data are complete, and the main data comprise the following aspects:
TSC test information, TSO test information, molten iron information, scrap steel information, coolant information for a heat generating agent, magnesia calcia material information, and the like.
The initial quantity of the steel material mainly consists of two parts of molten iron and scrap steel.
m Main-Star-Steel ＝m Molten-Iron +m Scrap (2.1)
Primary blowing of primary steel materials in a furnace time comprises the following average components:
1. calculating the carbon content (furnace gas charge) of the primary blowing initial material:
w Main-Start-C ＝(m Molten-Iron ×w Molten-Iron-C +m Scrap ×w Scrap-C )/m Main-Star-Steel (2.2)
2. calculating the silicon content of the primary blowing initial material (slag entering):
w Main-Start-Si ＝(m Molten-Iron ×w Molten-Iron-Si +m Scrap ×w Scrap-Si )/m Main-Star-Steel (2.3)
3. calculating the manganese content of the primary blowing initial material (slag entering):
w Main-Start-Mn ＝(m Molten-Iron ×w Molten-Iron-Mn +m Scrap ×w Scrap-Mn )/m Main-Star-Steel (2.4)
4. calculating the phosphorus content of the primary blowing initial material (slag entering):
w Main-Start-P ＝(m Molten-Iron ×w Molten-Iron-P +m Scrap ×w Scrap-P )/m Main-Star-Steel (2.5)
5. calculating the sulfur content (furnace gas inlet) of the primary blowing initial material:
w Main-Start-S ＝(m Molten-Iron ×w Molten-Iron-S +m Scrap ×w Scrap-S )/m Main-Star-Steel (2.6)
6. calculating the titanium content of the primary blowing initial material (slag entering):
w Main-Start-Ti ＝(m Molten-Iron ×w Molten-Iron-Ti +m Scrap ×w Scrap-Ti )/m Main-Star-Steel (2.7)
calculating the oxidation amount of the element entering the slag:
and (3) calculating the oxidation slag amount of the main magnesium oxide and calcium material:
m Main-Mg-Slag ＝m Main-Mg ×(1-L Mg-Rate ) (2.12)
m Main-Ca-Slag ＝m Main-Ca ×(1-L Ca-Rate ) (2.13)
element oxidation to slag amount in main blowing stage:
the initial slag amount in the post-blowing stage is as follows:
m Reblow-Star-Slag ＝m Last-Slag +m Main-De-Ele-Slag +m FeO-Slag-Reblow-Star (2.15)
wherein, the ferrous oxide content in the slag at the initial stage of back blowing can not be calculated, and 3 percent of the slag amount is taken as the ferrous oxide content according to practical production experience.
The initial molten steel amount in the post-blowing stage is as follows:
m Reblow-Star-Steel ＝m Molten-Iron +m Scrap -(R De-Mn ×w Main-Start-Mn ×m Main-Star-Steel +m Main-Star-Steel ×(w Main-Start-P -w Aim-P ))-w Main-Start-Si ×m Main-Star-Steel -w Main-Start-Ti ×m Main-Star-Steel -w Ld-S ×m Ld -(w Main-Star-C -w Tsc-Testing-C )×m Main-Star-Steel +w Cooling-Fe ×m Cooling (2.16)
and respectively calculating the heat required by the temperature rise of the slag and the molten steel in the process from TSC to TSO, wherein the heat required by the temperature rise of the slag and the heat required by the temperature rise of the molten steel are specifically included.
A1. The temperature of the slag needs heat
H Need-Slag ＝(T TSO-Testing -T TSC-Testing )×m Reblow-Star-Slag ×C Slag-Solid ×H Slag-Latent +T TSC-Testing ×m Reblow-Star-Slag ×C Slag-Solid ×H Slag-Latent ×R Heat-Loss (2.17)
A2. The heat is needed for heating the molten steel
H Need-Steel ＝(T TSO-Testing -T TSC-Testing )×m Reblow-Star-Steel ×C Steel ×H Steel-Latent +T TSC-Testing ×m Reblow-Star-Steel ×C Steel ×H Steel-Latent ×R Heat-Loss (2.18)
Wherein the specific heat capacity of the solid slag is 1.045kJ/kg, the latent heat of slag fusion is 209kJ/kg, the specific heat capacity of steel is 0.837kJ/kg, the latent heat of steel fusion is 272kJ/kg, and the average back-blowing heat loss rate is 2.07%.
The heat of the post-blowing temperature rise comprises two parts of slag and molten steel:
H Need-Reblow ＝H Need-Slag +H Need-Steel (2.19)
the post-blowing carbon oxidation exotherm was calculated from the C values in the molten steel measured for TSO and TSC:
here, it is emphasized that the TSO detection cannot directly detect the carbon content in the molten steel, but can detect the dissolved oxygen content in the molten steel, since the carbon oxygen product in the molten steel at a certain temperature is a constant value. Therefore, the carbon content in the molten steel can be obtained as C by setting the carbon-oxygen product to 0.0025 Tso-Testin g，
m C-Reblow ＝(C Tso-Testing -C Tsc-Testing )×m Main-Star-Steel (2.20)
According to actual production, in the post-blowing stage, the ratio of carbon to carbon monoxide is 0.8, and the ratio of carbon to carbon dioxide is 0.2.
In the post-blow stage, when the oxidation exotherm of carbon is insufficient to provide the heat of elevated temperature, the exotherm is provided by the oxidation of iron to FeO, and therefore:
H Fe-Reblow ＝H Need-Reblow -H C-Reblow (2.22)
further, the step S6 of calculating the ferrite amount further includes:
m Fe-FeO ＝H Fe-Reblow /H Fe-FeO (2.23)
post-blowing initial average components of the steel and iron materials in the furnace time:
calculating the content of the elements of the generated slag in the molten steel:
w Reblow-Start-Si ＝(w Si-Hot ×m Hot-Reblow +w Si-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (2.24)
w Reblow-Start-Mn ＝(w Mn-Hot ×m Hot-Reblow +w Mn-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (2.25)
w Reblow-Start-P ＝(w P-Hot ×m Hot-Reblow +w P-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (2.26)
w Reblow-Start-Ti ＝(w Ti-Hot ×m Hot-Reblow +w Ti-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (2.27)
calculating the oxidation slag amount of slag forming elements:
post-blown magnesium material produces slag:
m Reblow-Mg-Slag ＝m Mg ×(1-R Loi-Mg ) (2.32)
post-blowing calcareous material produces slag:
m Reblow-Ca-Slag ＝m Ca ×(1-R Loi-Ca ) (2.33)
m Ending-Slag ＝m Start-Reblow-Slag +m Reblow-De-Ele-Slag (2.35)
further, the step S8 of calculating the ferrous oxide content in the slag further includes:
w FeO-Slag ＝(m FeO-Slag +m Fe-FeO )/m Ending-Slag (2.36)
the results of the 10 groups of calculation were compared with the actual test data to make a data comparison chart as shown in fig. 3.
Claims (9)
1. A method for predicting the FeO content of final slag of a converter is used for predicting the FeO content in the final slag during converter steelmaking and is characterized in that:
s1, collecting field actual production data;
s2, calculating the initial molten steel and slag quantity in the post-blowing stage;
s3, calculating heat required to be provided by heating in a post-blowing process (a middle converting process from TSC test to TSO test);
s4, calculating the heat generated by oxidization of carbon elements in the back blowing process;
s5, calculating the temperature rise and heat release of iron oxidation required in the back blowing process;
s6, calculating the amount of iron oxidized into FeO in the molten steel;
s7, calculating the final slag quantity;
s8, calculating the FeO content in the final slag.
2. The method for predicting the FeO content of the final slag according to claim 1, further comprising, in the step S1:
comprehensive information of the heat should be collected, including molten iron information, scrap steel information, material information (magnesium material, calcium material, heat generating agent, coolant), etc.
3. The method according to claim 1, further comprising, in the step S2:
wherein the oxidation of the primary blowing stage elements into slag comprises the following steps: the slag amount of element oxidation in the raw materials such as main-blowing magnesia material, main-blowing calcia material, main-blowing exothermic agent, main-blowing coolant, scrap steel, molten iron and the like.
The initial quantity of the steel materials mainly comprises two parts of molten iron and scrap steel:
m Main-Star-Steel ＝m Molten-Iron +m Scrap (1.1)
wherein m is Main-Star-Steel The initial steel and iron material amount is mainly blown, and kg is obtained;
m Molten-Iron the amount of molten iron is kg;
m Scrap the addition amount of the scrap steel is kg;
primary blowing of primary steel materials in a furnace time comprises the following average components:
w Main-Start-C ＝(m Molten-Iron ×w Molten-Iron-C +m Scrap ×w Scrap-C )/m Main-Star-Steel (1.2) wherein w Main-Start-C The carbon content of the primary blowing initial steel material is%;
w Molten-Iron-C the carbon content of molten iron is percent;
w Scrap-C carbon content of scrap steel,%;
w Main-Start-Si ＝(m Molten-Iron ×w Molten-Iron-Si +m Scrap ×w Scrap-Si )/m Main-Star-Steel (1.3)
wherein w is Main-Start-Si The silicon content of the primary blowing initial steel iron material is%;
w Molten-Iron-Si the silicon content of molten iron is percent;
w Scrap-Si silicon content of scrap steel,%;
w Main-Start-Mn ＝(m Molten-Iron ×w Molten-Iron-Mn +m Scrap ×w Scrap-Mn )/m Main-Star-Steel (1.4)
wherein w is Main-Start-Mn The manganese content of the primary blowing initial steel iron material is%;
w Molten-Iron-Mn the manganese content of molten iron is percent;
w Scrap-Mn manganese content of scrap steel,%;
w Main-Start-P ＝(m Molten-Iron ×w Molten-Iron-P +m Scrap ×w Scrap-P )/m Main-Star-Steel (1.5)
wherein w is Main-Start-P The phosphorus content of the primary steel material is%;
w Molten-Iron-P the content of phosphorus in molten iron is percent;
w Scrap-P the phosphorus content of the scrap steel is percent;
w Main-Start-S ＝(m Molten-Iron ×w Molten-Iron-S +m Scrap ×w Scrap-S )/m Main-Star-Steel (1.6)
wherein w is Main-Start-S Sulfur content of primary blowing initial steel and iron material,%;
w Molten-Iron-S sulfur content of molten iron,%;
w Scrap-S sulfur content of scrap steel,%;
w Main-Start-Ti ＝(m Molten-Iron ×w Molten-Iron-Ti +m Scrap ×w Scrap-Ti )/m Main-Star-Steel (1.7)
wherein w is Main-Start-Ti The titanium content of the primary steel material is%;
w Molten-Iron-Ti titanium content of molten iron,%;
w Scrap-Ti titanium content of scrap steel,%;
oxidation of main blowing iron and steel elements into slag:
wherein,oxidizing silicon element in the steel material into slag quantity, kg;
w Hot-Si silicon content in the exothermic agent,%;
m Hot the heating agent is added in an amount of kg;
w Cooling-Si is the silicon content,%;
m Cooling the amount of the coolant is kg;
wherein,oxidizing manganese element in the steel material into slag quantity, kg;
w Hot-Mn manganese content in the exothermic agent,%;
w Cooling-Mn manganese content in the coolant,%;
wherein,oxidizing phosphorus element in the steel material into slag quantity, kg;
w Hot-P phosphorus content in the exothermic agent,%;
w Cooling-P the content of phosphorus in the coolant is percent;
wherein,the amount of the slag is kg when titanium element in the steel material is oxidized;
w Hot-Ti titanium content in the exothermic agent,%;
w Cooling-Ti titanium content in the coolant,%;
m Main-Mg-Slag ＝m Main-Mg ×(1-L Mg-Rate )(1.12)
wherein m is Main-Mg-Slag Slag quantity and kg are generated for magnesium materials in the main blowing stage;
m Main-Mg the magnesium material is added in the main blowing stage, and kg is obtained;
L Mg-Rate percent of the burning rate of the magnesia material;
m Main-Ca-Slag ＝m Main-Ca ×(1-L Ca-Rate ) (1.13)
wherein m is Main-Ca-Slag Slag quantity and kg are generated for the calcareous material in the main blowing stage;
m Main-Ca the addition amount of the calcareous material in the main blowing stage is kg;
L Ca-Rate the burning rate of the calcareous material,%;
wherein m is Main-De-Ele-Slag The slag is oxidized into slag quantity by the main blowing element, kg;
the initial slag amount in the post-blowing stage is as follows:
m Reblow-Star-Slag ＝m Last-Slag +m Main-De-Ele-Slag +m FeO-Slag-Reblow-Star (1.15)
wherein m is Reblow-Star-Slag The initial slag amount is blown back, kg;
m Last-Slag slag is left for the upper furnace, kg;
m FeO-Slag-Reblow-Star the ferrous oxide content in the slag is kg after the back blowing;
the initial molten steel amount in the post-blowing stage is as follows:
m Reblow-Star-Steel ＝m Molten-Iron +m Scrap -(R De-Mn ×w Main-Start-Mn ×m Main-Star-Steel +m Main-Star-Steel ×(w Main-Start-P -w Aim-P ))-w Main-Start-Si ×m Main-Star-Steel -w Main-Start-Ti ×m Main-Star-Steel -w Ld-S ×m Ld -(w Main-Star-C -w Tsc-Testing-C )×m Main-Star-Steel +w Cooling-Fe ×m Cooling (1.16)
wherein m is Reblow-Star-Ste The initial iron and steel material amount is back-blown, and kg is obtained;
R De-Mn manganese element conversion,%;
w Aim-P for the target phosphorus content,%;
w Ld-S sulfur content in the furnace dust,%;
m Ld the amount of the dust is kg;
w Tsc-Testing-C carbon content,%;
w Cooling-Fe for the iron content in the coolant,%.
4. The method according to claim 1, further comprising, in the step S3:
the heat required by the temperature rise of the slag and the molten steel in the process of TSC to TSO is calculated respectively, and the heat required by the temperature rise of the slag and the heat required by the temperature rise of the molten steel are specifically:
A1. the temperature of the slag needs heat
H Need-Slag ＝(T TSO-Testing -T TSC-Testing )×m Reblow-Star-Slag ×C Slag-Solid ×H Slag-Latent +T TSC-Testing ×m Reblow-Star-Slag ×C Slag-Solid ×H Slag-Latent ×R Heat-Loss (1.17)
Wherein H is Need-Slag Heat kJ is needed for heating the back-blowing slag;
T TSO-Testing testing the temperature for TSO, and the temperature is DEG C;
T TSC-Testing testing the temperature for TSC, and the temperature is DEG C;
m Slag kg for entering the slag quantity of the post-blowing stage;
C Slag-Solid kJ/(kg. Deg.C) for solid slag specific heat capacity;
H Slag-Latent kJ/kg, the latent heat of slag melting;
R Heat-Loss heat loss rate,%;
A2. the heat is needed for heating the molten steel
H Need-Steel ＝(T TSO-Testing -T TSC-Testing )×m Reblow-Star-Steel ×C Steel ×H Steel-Latent +T TSC-Testing ×m Reblow-Star-Steel ×C Steel ×H Steel-Latent ×R Heat-Loss (1.18)
Wherein H is Need-Steel Heat is needed for heating up the post-blown molten steel, kJ;
C Steel kJ/(kg. Deg.C) is the specific heat capacity of molten steel;
H Steel-Latent is the latent heat of molten steel melting, kJ/kg.
5. The method according to claim 1, further comprising, in the step S4:
the heat of the post-blowing temperature rise comprises two parts of slag and molten steel:
H Need-Reblow ＝H Need-Slag +H Need-Steel (1.19)
wherein H is Need-Reblow The heat required to be provided for the post-blowing temperature rising process is kJ;
the post-blowing carbon oxidation exotherm was calculated from the C values in the molten steel measured for TSO and TSC:
m C-Reblow ＝(C Tso-Testing -C Tsc-Testing )×m Main-Star-Steel (1.20)
wherein m is C-Reblow Carbon oxidation amount in the post-blowing stage, kg;
C Tso-Testing carbon values,%;
C Tsc-Testing carbon values,%;
wherein H is C-Reblow Exothermic heat for carbon oxidation in the post-blowing stage, kJ;
m C-Reblow the carbon oxidation amount is kg in the post-blowing stage;
H C-CO the carbon in unit mass is converted into carbon monoxide to emit heat, kJ;
the carbon per unit mass is converted to carbon dioxide exotherm, kJ.
6. The method according to claim 1, further comprising, in the step S5:
in the post-blow stage, when the oxidation exotherm of carbon is insufficient to provide the heat of elevated temperature, the exotherm is provided by the oxidation of iron to FeO, and therefore:
H Fe-Reblow ＝H Need-Reblow -H C-Reblow (1.22)
wherein H is Fe-Reblow The iron oxidation exotherm for the post-blow stage, kJ.
7. The method according to claim 1, further comprising, in the step S6:
m Fe-FeO ＝H Fe-Reblow /H Fe-FeO (1.23)
wherein m is Fe-FeO The amount of iron in the post-blown molten steel is oxidized into ferrous oxide, and kg.
8. The method according to claim 1, further comprising, in the step S7:
post-blowing initial average components of the steel and iron materials in the furnace time:
w Reblow-Start-Si ＝(w Si-Hot ×m Hot-Reblow +w Si-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (1.24)
wherein w is Reblow-Start-Si The silicon element content in molten steel is the percent for starting the back blowing;
w Si-Hot silicon content in the post-blow exothermic agent,%;
m Hot-Reblow the adding amount of the post-blowing exothermic agent is kg;
w Si-Cooling silicon content in post-blow coolant,%;
m Cooling-Reblow the addition amount of the post-blowing cooling agent is kg;
w Reblow-Start-Mn ＝(w Mn-Hot ×m Hot-Reblow +w Mn-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (1.25)
wherein w is Reblow-Start-Mn The manganese element content in molten steel is the percent for starting the back blowing;
w Mn-Hot manganese content in the post-blow exothermic agent,%;
w Mn-Cooling manganese content in post-blow coolant,%;
w Reblow-Start-P ＝(w P-Hot ×m Hot-Reblow +w P-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (1.26)
wherein w is Reblow-Start-P The content of phosphorus element in molten steel is calculated as percent for the start of back blowing;
w P-Hot the content of phosphorus in the post-blowing exothermic agent is percent;
w P-Cooling phosphorus content in post-blow coolant,%;
w Reblow-Start-Ti ＝(w Ti-Hot ×m Hot-Reblow +w Ti-Cooling ×m Cooling-Reblow )/m Reblow-Star-Steel (1.27)
wherein w is Reblow-Start-Ti Titanium element content in molten steel is calculated for the beginning of back blowing,%;
w Ti-Hot titanium content in the post-blow exothermic agent,%;
w Ti-Cooling titanium content in post-blow coolant,%;
wherein,kg of slag amount for silicon oxidation;
wherein,the manganese is oxidized into slag quantity, kg;
wherein,the amount of the slag is kg when phosphorus is oxidized into slag;
wherein,is formed by oxidizing titanium intoSlag amount, kg;
post-blown magnesium material produces slag:
m Reblow-Mg-Slag ＝m Mg ×(1-R Loi-Mg ) (1.32)
wherein m is Reblow-Mg-Slag Slag amount and kg are generated for the back-blown magnesium material;
R Loi-Mg the percent is the burning rate of the magnesia material;
post-blowing calcareous material produces slag:
m Reblow-Ca-Slag ＝m Ca ×(1-R Loi-Ca ) (1.33)
wherein m is Reblow-Ca-Slag Slag amount and kg are generated for the back blowing of calcareous material;
R Loi-Ca the burning rate of the calcium material is percent;
post-blowing process element oxidation to slag:
wherein m is Reblow-De-Ele-Slag Oxidizing the back blowing element into slag quantity, kg;
m Ending-Slag ＝m Start-Reblow-Slag +m Reblow-De-Ele-Slag (1.35)
wherein m is Ending-Slag The final slag amount was expressed as kg.
9. The method according to claim 1, further comprising, in the step S8:
w FeO-Slag ＝(m FeO-Slag +m Fe-FeO )/m Ending-Slag (1.36)
wherein w is FeO-Slag Is the ferrous oxide content in the slag,%.
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| CN202311694438.XA CN117683962A (en) | 2023-12-11 | 2023-12-11 | Method for predicting FeO content of converter final slag |
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| CN202311694438.XA CN117683962A (en) | 2023-12-11 | 2023-12-11 | Method for predicting FeO content of converter final slag |
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