CN103952508B - A kind of tap before add the operational approach of modification agent - Google Patents
A kind of tap before add the operational approach of modification agent Download PDFInfo
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Abstract
The invention belongs to steel-smelting technology Technology field, before disclosing a kind of tapping, add the operational approach of modification agent, reach home catch carbon including: converter smelting；Measure terminal oxygen content α；According to terminal oxygen content α, in stove, add modification agent；Converter tapping operates；Converter tapping carries out slag splashing operation after terminating；Wherein, as α≤800ppm, the scope of the modification agent added before tapping is 500kg～1000kg；As 800ppm < α≤900ppm, the scope of the modification agent added before tapping is 1000kg～1500kg；As 900ppm < α≤1000ppm, the scope of the modification agent added before tapping is 1500kg～2000kg；As α > 1000ppm, the scope of the modification agent added before tapping is 2000kg～2500kg；All after-blow heats, adding modification agent scope before tapping is: 1500kg～2000kg.The present invention method by adding modification agent, solves strong oxidizing property slag and spatters the difficult problem that slag consumption is high, cannot not spatter dryly, achieve good effect.
Description
Technical field
The present invention relates to process for making technical field, particularly to the operational approach adding modification agent before a kind of tapping.
Background technology
Current iron and steel enterprise competition, under these circumstances, reduction consumes, control production cost is just particularly important.Convertor steelmaking process adopts and is blown into oxygen in stove, oxygen and the auxiliary material added in stove: Calx, light dolomite, sintering deposit etc. react, form converter slag, converter slag under the stirring of oxygen stream stock with the molten iron generation chemical reaction in stove, finally realize carbon elimination, go functions such as being mingled with.
Converter smelting endpoint slag is called finishing slag, in converter finishing slag, full ferrum Tfe content is the important indicator weighing finishing slag oxidisability, under normal production conditions, converter finishing slag Tfe data fluctuate between 10%-30%, Tfe content is more high, converter finishing slag oxidisability is more strong, stronger oxidisability directly affects the operation of next heat splashing slag in converter, cause auxiliary materials such as spattering slag modification agent, light dolomite and spatter slag nitrogen consumption increase, the more important thing is, when remaining slag operation, the slag that oxidisability is stronger not easily spatters dry, there is the potential safety hazard of iron making process generation splash.In existing process for making, strong oxidizing property slag spatters that slag consumption is high, it is not thorough to spatter slag.
Summary of the invention
The technical problem to be solved is to provide a kind of strong oxidizing property slag that reduces and spatters slag slag charge consumption, promotes the process spattering slag efficiency simultaneously.
For solving above-mentioned technical problem, add the operational approach of modification agent before the invention provides a kind of tapping, comprise the following steps:
Converter smelting is reached home catch carbon；
Measure terminal oxygen content α；
According to terminal oxygen content α, in stove, add modification agent；
Carry out converter tapping operation；
After converter tapping terminates, carry out slag splashing operation；
Wherein, as α≤800ppm, the scope of the modification agent added before tapping is 500kg～1000kg；
As 800ppm < α≤900ppm, the scope 1000kg～1500kg of the modification agent added before tapping；
As 900ppm < α≤1000ppm, the scope of the modification agent added before tapping is 1500kg～2000kg；
As α > 1000ppm, the scope of the modification agent added before tapping is 2000kg～2500kg；
All after-blow heats, adding modification agent scope before tapping is: 1500kg～2000kg.
Further, described modification agent includes: magnesium oxide MgO, calcium oxide CaO, silicon dioxide SiO2, carbon C and a small amount of impurity；Wherein, the content range of described magnesium oxide MgO is: 55%～60%, the content range of described calcium oxide CaO is: 5%～10%, and the content range of described silicon dioxide SiO2 is: 3%～5%, and the content range of described carbon C is: 10%～15% all the other be a small amount of impurity.
Further, described terminal oxygen content α is measured by TSO auxiliary lance probe.
Add the operational approach of modification agent before tapping provided by the invention, by measuring the terminal oxygen content of converter smelting endpoint, and on this basis, in converter, add a certain amount of modification agent converter finishing slag is carried out pre-deoxidation, enhance slag splashing effect；Meanwhile, greatly reduce strong oxidizing property slag and spatter slag slag charge consumption, promote simultaneously and spatter slag efficiency, improve and spatter slag and spatter and do not do, halfway problem.
Accompanying drawing explanation
The front flow chart adding modification agent of tapping that Fig. 1 provides for the embodiment of the present invention.
Detailed description of the invention
Referring to Fig. 1, the embodiment of the present invention adds the operational approach of modification agent before providing a kind of tapping, be used for strengthening slag splashing effect, reduces strong oxidizing property slag and spatters slag slag charge consumption, promotes simultaneously and spatters slag efficiency, improves and spatters slag and spatter and do not do, halfway problem.Comprise the following steps:
Converter smelting is reached home catch carbon；
Measure terminal oxygen content α；
According to terminal oxygen content α, in stove, add modification agent；
Carry out converter tapping operation；
After converter tapping terminates, carry out slag splashing operation；
Wherein, as α≤800ppm, the scope of the modification agent added before tapping is 500kg～1000kg；
As 800ppm < α≤900ppm, the scope 1000kg～1500kg of the modification agent added before tapping；
As 900ppm < α≤1000ppm, the scope of the modification agent added before tapping is 1500kg～2000kg；
As α > 1000ppm, the scope of the modification agent added before tapping is 2000kg～2500kg；
All after-blow heats, adding modification agent scope before tapping is: 1500kg～2000kg.
Pneumatic steelmaking, the operation of oxygen feeding stop immediately, i.e. catch carbon when carbon content reaches required value.Owing to the decarburizing reaction speed of smelting process is fast, carbon content in steel when accurately judging close to terminal, stop oxygen blast in time, particularly significant.
After completing catch carbon operation, measure terminal oxygen content α in converter, by this, as the foundation adding modification agent in converter；Preferably, the measurement terminal oxygen content of auxiliary lance probe TSO precise and high efficiency is adopted.
After measuring terminal oxygen content α, in converter, add modification agent, select the dosage added according to actual needs, with reference to above-mentioned standard, with terminal oxygen content for standard, be illustrated by the following example.In order to ensure to spatter the smooth of slag reaction, thoroughly carry out, required by the content of each component is had, it is preferred that the content range of magnesium oxide MgO is: 55%～60%；The content range of calcium oxide CaO is: 5%～10%；Silicon dioxide SiO2Content range be: 3%～5%；The content range of carbon C is: 10%～15% all the other be a small amount of impurity.
Embodiment one
Experiment one
As α≤800ppm, the dosage of the modification agent added before tapping is 500kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, it is ensured that Minimum requirements amount.
Magnesium oxide content of MgO is 60%, it is ensured that in slag, magnesium oxide content of MgO is in high level, fully saturated, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 15% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.But ferrous oxide FeO content is unsuitable too low, and FeO content is too low in marc, converter slag-making can be caused again and remove P, S difficulty.Therefore operation must strictly control FeO content in slag.In consideration of it, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon dioxide SiO2Content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in high level so that it can fully react, and promotes slag splashing effect.
Experiment two
As α≤800ppm, the dosage of the modification agent added before tapping is 750kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative experimental one, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide content of MgO is 57%, it is ensured that magnesium oxide content of MgO high level in slag, basically reaches saturation, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 12% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon dioxide SiO2Content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
Experiment three
As α≤800ppm, the dosage of the modification agent added before tapping is 1000kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative to experiment two, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.Modification agent can be in high level level all the time simultaneously, it is ensured that faster reaction efficiency, and then realizes efficiently spattering slag.
Magnesium oxide content of MgO is 55%, it is ensured that in slag, magnesium oxide content of MgO can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thus ensureing that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, ensure that reaction between carbon and oxygen, realize the deoxygenation of ferrous oxide FeO in slag, reduce the content of ferrous oxide in slag, it is at lower standard, thus slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, ensure that furnace lining possesses certain corrosion resistance, it is ensured that slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon dioxide SiO2Content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
Embodiment two
Experiment four
As 800ppm < α≤900ppm, the dosage of the modification agent added before tapping is 1000kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, it is ensured that Minimum requirements amount.
Magnesium oxide content of MgO is 60%, it is ensured that in slag, magnesium oxide content of MgO is in high level, fully saturated, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 15% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.But ferrous oxide FeO content is unsuitable too low, and FeO content is too low in marc, converter slag-making can be caused again and remove P, S difficulty.Therefore operation must strictly control FeO content in slag.In consideration of it, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon dioxide SiO2Content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in high level so that it can fully react, and promotes slag splashing effect.
Experiment five
As 800ppm < α≤900ppm, the dosage of the modification agent added before tapping is 1250kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative to experiment four, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide content of MgO is 57%, it is ensured that magnesium oxide content of MgO high level in slag, basically reaches saturation, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 12% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon dioxide SiO2Content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
Experiment six
As 800ppm < α≤900ppm, the dosage of the modification agent added before tapping is 1500kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative to experiment five, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.Modification agent can be in high level level all the time simultaneously, it is ensured that faster reaction efficiency, and then realizes efficiently spattering slag.
Magnesium oxide content of MgO is 55%, it is ensured that in slag, magnesium oxide content of MgO can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thus ensureing that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, ensure that reaction between carbon and oxygen, realize the deoxygenation of ferrous oxide FeO in slag, reduce the content of ferrous oxide in slag, it is at lower standard, thus slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, ensure that furnace lining possesses certain corrosion resistance, it is ensured that slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon dioxide SiO2Content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
Embodiment three
Experiment seven
As 900ppm < α≤1000ppm, the dosage of the modification agent added before tapping is 1500kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, it is ensured that Minimum requirements amount.
Magnesium oxide content of MgO is 60%, it is ensured that in slag, magnesium oxide content of MgO is in high level, fully saturated, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 15% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.But ferrous oxide FeO content is unsuitable too low, and FeO content is too low in marc, converter slag-making can be caused again and remove P, S difficulty.Therefore operation must strictly control FeO content in slag.In consideration of it, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon dioxide SiO2Content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in high level so that it can fully react, and promotes slag splashing effect.
Experiment eight
As 900ppm < α≤1000ppm, the dosage of the modification agent added before tapping is 1750kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative to experiment seven, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide content of MgO is 57%, it is ensured that magnesium oxide content of MgO high level in slag, basically reaches saturation, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 12% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon dioxide SiO2Content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
Experiment nine
As 900ppm < α≤1000ppm, the dosage of the modification agent added before tapping is 2000kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative to experiment eight, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.Modification agent can be in high level level all the time simultaneously, it is ensured that faster reaction efficiency, and then realizes efficiently spattering slag.
Magnesium oxide content of MgO is 55%, it is ensured that in slag, magnesium oxide content of MgO can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thus ensureing that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, ensure that reaction between carbon and oxygen, realize the deoxygenation of ferrous oxide FeO in slag, reduce the content of ferrous oxide in slag, it is at lower standard, thus slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, ensure that furnace lining possesses certain corrosion resistance, it is ensured that slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon dioxide SiO2Content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
Embodiment four
Experiment ten
As α > 1000ppm, the dosage of the modification agent added before tapping is 2000kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, it is ensured that Minimum requirements amount.
Magnesium oxide content of MgO is 60%, it is ensured that in slag, magnesium oxide content of MgO is in high level, fully saturated, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 15% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.But ferrous oxide FeO content is unsuitable too low, and FeO content is too low in marc, converter slag-making can be caused again and remove P, S difficulty.Therefore operation must strictly control FeO content in slag.In consideration of it, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon dioxide SiO2Content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in high level so that it can fully react, and promotes slag splashing effect.
Test 11
As α > 1000ppm, the dosage of the modification agent added before tapping is 2250kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative to experiment ten, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide content of MgO is 57%, it is ensured that magnesium oxide content of MgO high level in slag, basically reaches saturation, and the meltage of the magnesium oxide MgO in furnace lining is lower, thus ensureing that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening；Slag possesses good viscosity simultaneously, it is possible to stable is attached on furnace wall, strengthens its corrosion resistance, strengthens slag splashing ability.
The content 12% of carbon C in modification agent, under the premise of mix homogeneously, it is possible to ensure sufficient reaction between carbon and oxygen, it is possible to the deoxygenation efficiency being substantially improved in slag ferrous oxide FeO, reduce the content of ferrous oxide in slag, it is at lower standard, thus significantly slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, reduce slag fluidity, make slag be more easy to and be attached on furnace lining, it is ensured that furnace lining possesses superior corrosion resistance, strengthen slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon dioxide SiO2Content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
Test 12
As α > 1000ppm, the dosage of the modification agent added before tapping is 2500kg；Now ensure that amounts of reactants, it is achieved the pre-deoxidation of converter finishing slag, under the premise of mix homogeneously, relative to experiment 11, it is possible to promoting reaction efficiency, slag effect is spattered in strengthening.Modification agent can be in high level level all the time simultaneously, it is ensured that faster reaction efficiency, and then realizes efficiently spattering slag.
Magnesium oxide content of MgO is 55%, it is ensured that in slag, magnesium oxide content of MgO can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thus ensureing that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, ensure that reaction between carbon and oxygen, realize the deoxygenation of ferrous oxide FeO in slag, reduce the content of ferrous oxide in slag, it is at lower standard, thus slag promotes fusing point, reduces the content of all kinds of low melting point ferrite, ensure that furnace lining possesses certain corrosion resistance, it is ensured that slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon dioxide SiO2Content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C is in higher level so that it can fully react, and promotes slag splashing effect.
All after-blow heats, adding modification agent scope before tapping is: 1500kg～2000kg.Thus, under ensureing the premise spattering slag effect, reduce strong oxidizing property slag and spatter slag slag charge consumption, promote simultaneously and spatter slag efficiency, improve and spatter slag and spatter and do not do, halfway problem.
Add the operational approach of modification agent before the tapping that the embodiment of the present invention provides, by measuring the terminal oxygen content of converter smelting endpoint, and on this basis, in converter, add a certain amount of modification agent converter finishing slag is carried out pre-deoxidation, enhance slag splashing effect；Meanwhile, greatly reduce strong oxidizing property slag and spatter slag slag charge consumption, promote simultaneously and spatter slag efficiency, improve and spatter slag and spatter and do not do, halfway problem.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme and unrestricted, although the present invention being described in detail with reference to example, it will be understood by those within the art that, technical scheme can be modified or equivalent replacement, without deviating from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (3)
1. add the operational approach of modification agent before a tapping, it is characterised in that comprise the following steps:
Converter smelting is reached home catch carbon；
Measure terminal oxygen content α；
According to terminal oxygen content α, in stove, add modification agent；
Carry out converter tapping operation；
After converter tapping terminates, carry out slag splashing operation；
Wherein, as α≤800ppm, the scope of the modification agent added before tapping is 500kg～1000kg；
As 800ppm < α≤900ppm, the scope 1000kg～1500kg of the modification agent added before tapping；
As 900ppm < α≤1000ppm, the scope of the modification agent added before tapping is 1500kg～2000kg；
As α > 1000ppm, the scope of the modification agent added before tapping is 2000kg～2500kg；
All after-blow heats, adding modification agent scope before tapping is: 1500kg～2000kg；
Wherein, pneumatic steelmaking, the operation of oxygen feeding stop immediately when carbon content reaches required value.
2. add the operational approach of modification agent before tapping as claimed in claim 1, it is characterised in that described modification agent includes: magnesium oxide MgO, calcium oxide CaO, silicon dioxide SiO2, carbon C and a small amount of impurity；Wherein, the content range of described magnesium oxide MgO is: 55%～60%, and the content range of described calcium oxide CaO is: 5%～10%, described silicon dioxide SiO2Content range be: 3%～5%, the content range of described carbon C is: 10%～15%, and the content range of described impurity is: 1%～3%.
3. before tapping as claimed in claim 2, add the operational approach of modification agent, it is characterised in that: described terminal oxygen content α is measured by TSO auxiliary lance probe.
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| CN104745761B (en) * | 2015-04-23 | 2017-03-29 | 攀钢集团研究院有限公司 | The method of semisteel smelting converter terminal residue adjustment |
| CN105463152B (en) * | 2015-12-07 | 2017-10-03 | 北京首钢股份有限公司 | A kind of converter slag splashing method |
| CN106947845A (en) * | 2017-05-23 | 2017-07-14 | 攀钢集团西昌钢钒有限公司 | A kind of method of slag splashing |
| CN110129512A (en) * | 2019-06-17 | 2019-08-16 | 河钢股份有限公司承德分公司 | A kind of final slag modifier and converter semi-steel making finishing slag method for modifying |
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|---|---|---|---|---|
| CN1264745A (en) * | 2000-02-22 | 2000-08-30 | 伍发贵 | Final slag modifier for smelting steel in converter |
| CN101413043A (en) * | 2008-12-05 | 2009-04-22 | 攀枝花钢城集团有限公司 | Steel-smelting regulator and preparation thereof |
| CN102876834A (en) * | 2012-08-23 | 2013-01-16 | 攀钢集团研究院有限公司 | Method for modifying semisteel converter steelmaking final slag |
| CN103695593A (en) * | 2013-12-16 | 2014-04-02 | 新余钢铁集团有限公司 | Automatic steelmaking and slag-leaving operation method for converter |
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