CN103952508A - Operation method for adding modifier before tapping - Google Patents
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- CN103952508A CN103952508A CN201410176094.8A CN201410176094A CN103952508A CN 103952508 A CN103952508 A CN 103952508A CN 201410176094 A CN201410176094 A CN 201410176094A CN 103952508 A CN103952508 A CN 103952508A
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Abstract
The invention belongs to the technical field of steel making, and discloses an operation method for adding a modifier before tapping. The operation method comprises the following steps: performing converter smelting to an end point for catch carbon; measuring the content alpha of oxygen at the end point; according to the content alpha of oxygen at the end point, adding the modifier in a converter; performing converter tapping operation; after the converter tapping is over, carrying out slag splashing converter protection operation, wherein when alpha is less than or equal to 800ppm, the modifier added before tapping ranges from 500kg to 1000kg; when alpha is more than 800ppm and less than or equal to 900ppm, the modifier added before tapping ranges from 1000kg to 1500kg; when alpha is more than 900ppm and less than or equal to 1000ppm, the modifier added before tapping ranges from 1500kg to 2000kg; when alpha is more than 1000ppm, the modifier added before tapping ranges from 2000kg to 2500kg; and for all after-blow converters, the modifier added before tapping ranges from 1500kg to 2000kg. By utilizing the method for adding the modifier, the difficulties that the strongly oxidized converter slag splashing consumption is high and splashing is not dry can be solved, and an excellent effect can be achieved.
Description
Technical field
The present invention relates to process for making technical field, particularly before a kind of tapping, add the working method of modification agent.
Background technology
Current iron and steel enterprise competition, under these circumstances, reduction consumes, production control cost just seems particularly important.Convertor steelmaking process adopts and be blown into oxygen in stove, oxygen with add the auxiliary material in stove: lime, light dolomite, agglomerate etc. react, form converter slag, converter slag under the stirring of Oxygen Flow thigh with stove in molten iron generation chemical reaction, the function such as finally realize carbon elimination, go to be mingled with.
Converter smelting endpoint slag is called finishing slag, in converter finishing slag, full iron Tfe content is the important indicator of weighing finishing slag oxidisability, under normal production conditions, converter finishing slag Tfe data fluctuate between 10%-30%, Tfe content is higher, converter finishing slag oxidisability is stronger, stronger oxidisability directly affects next heat splashing slag in converter operation, cause and spatter slag modification agent, auxiliary materials such as light dolomite and spatter the consumption of slag nitrogen and increase, the more important thing is, under remaining slag operation condition, the slag that oxidisability is stronger is difficult for spattering dry, the potential safety hazard of iron process generation splash is converted in existence.In existing process for making, strong oxidizing property slag spatter slag consume high, to spatter slag not thorough.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of reduction strong oxidizing property slag and spatters the consumption of slag slag charge, promotes the processing method of spattering slag efficiency simultaneously.
For solving the problems of the technologies described above, the invention provides the working method that adds modification agent before a kind of tapping, comprise the following steps:
The converter smelting catch carbon of reaching home;
Measure terminal oxygen level α;
According to terminal oxygen level α, in stove, add modification agent;
Carry out converter tapping operation;
After converter tapping finishes, carry out slag splashing operation;
Wherein, when α≤800ppm, the scope of the modification agent adding before tapping is 500kg～1000kg;
When 800ppm < α≤900ppm, the scope 1000kg～1500kg of the modification agent adding before tapping;
When 900ppm < α≤1000ppm, the scope of the modification agent adding before tapping is 1500kg～2000kg;
When α > 1000ppm, the scope of the modification agent adding before tapping is 2000kg～2500kg;
All after-blow heats, add modification agent scope to be: 1500kg～2000kg before tapping.
Further, described modification agent comprises: 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%, the content range of described silicon-dioxide SiO2 is: 3%～5%, the content range of described carbon C is: 10%～15% all the other be a small amount of impurity.
Further, described terminal oxygen level α measures by TSO auxiliary lance probe.
The working method that adds modification agent before tapping provided by the invention by measuring the terminal oxygen level of converter smelting endpoint, and on this basis, adds a certain amount of modification agent to carry out pre-deoxidation to converter finishing slag in converter, has strengthened slag splashing effect; Meanwhile, greatly reduce strong oxidizing property slag and spatter the consumption of slag slag charge, promote simultaneously and spatter slag efficiency, improved and spattered slag and cannot not spatter dryly, halfway problem.
Accompanying drawing explanation
The flow chart that adds modification agent before the tapping that Fig. 1 provides for the embodiment of the present invention.
Embodiment
Referring to Fig. 1, the embodiment of the present invention provides the working method that adds modification agent before a kind of tapping, for strengthening slag splashing effect, reduces strong oxidizing property slag and spatters the consumption of slag slag charge, promotes and spatters slag efficiency simultaneously, has improved to spatter slag and cannot not spatter dryly halfway problem.Comprise the following steps:
The converter smelting catch carbon of reaching home;
Measure terminal oxygen level α;
According to terminal oxygen level α, in stove, add modification agent;
Carry out converter tapping operation;
After converter tapping finishes, carry out slag splashing operation;
Wherein, when α≤800ppm, the scope of the modification agent adding before tapping is 500kg～1000kg;
When 800ppm < α≤900ppm, the scope 1000kg～1500kg of the modification agent adding before tapping;
When 900ppm < α≤1000ppm, the scope of the modification agent adding before tapping is 1500kg～2000kg;
When α > 1000ppm, the scope of the modification agent adding before tapping is 2000kg～2500kg;
All after-blow heats, add modification agent scope to be: 1500kg～2000kg before tapping.
Converter steelmaking, the operation of oxygen feeding stop, i.e. catch carbon immediately when carbon content reaches required value.Because the decarburizing reaction speed of smelting process is fast, carbon content in steel when accurately judgement approaches terminal, stops oxygen blast in time, very important.
Complete after catch carbon operation, measure terminal oxygen level α in converter, will using this as add the foundation of modification agent in converter; Preferably, adopt the measurement terminal oxygen level of auxiliary lance probe TSO precise and high efficiency.
Measure after terminal oxygen level α, in converter, add modification agent, the dosage that selection adds according to actual needs, with reference to above-mentioned standard, take terminal oxygen level as standard, by following embodiment, illustrates.In order to guarantee to spatter the smooth of slag reaction, thoroughly carry out, to the requirement to some extent of the content of each component, preferred, the content range of magnesium oxide MgO is: 55%～60%; The content range of calcium oxide CaO is: 5%～10%; Silicon-dioxide SiO
2content range be: 3%～5%; The content range of carbon C is: 10%～15% all the other be a small amount of impurity.
Embodiment mono-
Experiment one
When α≤800ppm, the dosage of the modification agent adding before tapping is 500kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, guarantee Minimum requirements amount.
Magnesium oxide MgO content is 60%, guarantees that in slag, magnesium oxide MgO content is in high level, and completely saturated, the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 15% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.But iron protoxide FeO content is unsuitable too low, as too low in FeO content in pomace, can causes again converter slag-making and remove P, S difficulty.Therefore in operation, must strictly control FeO content in slag.Given this, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon-dioxide SiO
2content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in high level, can fully react it, promotes slag splashing effect.
Experiment two
When α≤800ppm, the dosage of the modification agent adding before tapping is 750kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, relatively test one, can promote reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide MgO content is 57%, guarantees magnesium oxide MgO content high level in slag, the state that substantially reaches capacity, and the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 12% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon-dioxide SiO
2content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
Experiment three
When α≤800ppm, the dosage of the modification agent adding before tapping is 1000kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, with respect to experiment two, can promote reaction efficiency, slag effect is spattered in strengthening.Modification agent can guarantee faster reaction efficiency all the time in high level level simultaneously, and then slag is efficiently spattered in realization.
Magnesium oxide MgO content is 55%, guarantees that in slag, magnesium oxide MgO content can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thereby guarantees that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, can guarantee reaction between carbon and oxygen, realize the deoxygenation of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby slag promotes fusing point, reduce the content of all kinds of low melting point wustites, guarantee that furnace lining possesses certain corrosion resistance, guarantee slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon-dioxide SiO
2content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
Embodiment bis-
Experiment four
When 800ppm < α≤900ppm, the dosage of the modification agent adding before tapping is 1000kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, guarantee Minimum requirements amount.
Magnesium oxide MgO content is 60%, guarantees that in slag, magnesium oxide MgO content is in high level, and completely saturated, the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 15% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.But iron protoxide FeO content is unsuitable too low, as too low in FeO content in pomace, can causes again converter slag-making and remove P, S difficulty.Therefore in operation, must strictly control FeO content in slag.Given this, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon-dioxide SiO
2content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in high level, can fully react it, promotes slag splashing effect.
Experiment five
When 800ppm < α≤900ppm, the dosage of the modification agent adding before tapping is 1250kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, with respect to experiment four, can promote reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide MgO content is 57%, guarantees magnesium oxide MgO content high level in slag, the state that substantially reaches capacity, and the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 12% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon-dioxide SiO
2content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
Experiment six
When 800ppm < α≤900ppm, the dosage of the modification agent adding before tapping is 1500kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, with respect to experiment five, can promote reaction efficiency, slag effect is spattered in strengthening.Modification agent can guarantee faster reaction efficiency all the time in high level level simultaneously, and then slag is efficiently spattered in realization.
Magnesium oxide MgO content is 55%, guarantees that in slag, magnesium oxide MgO content can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thereby guarantees that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, can guarantee reaction between carbon and oxygen, realize the deoxygenation of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby slag promotes fusing point, reduce the content of all kinds of low melting point wustites, guarantee that furnace lining possesses certain corrosion resistance, guarantee slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon-dioxide SiO
2content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
Embodiment tri-
Experiment seven
When 900ppm < α≤1000ppm, the dosage of the modification agent adding before tapping is 1500kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, guarantee Minimum requirements amount.
Magnesium oxide MgO content is 60%, guarantees that in slag, magnesium oxide MgO content is in high level, and completely saturated, the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 15% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.But iron protoxide FeO content is unsuitable too low, as too low in FeO content in pomace, can causes again converter slag-making and remove P, S difficulty.Therefore in operation, must strictly control FeO content in slag.Given this, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon-dioxide SiO
2content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in high level, can fully react it, promotes slag splashing effect.
Experiment eight
When 900ppm < α≤1000ppm, the dosage of the modification agent adding before tapping is 1750kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, with respect to experiment seven, can promote reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide MgO content is 57%, guarantees magnesium oxide MgO content high level in slag, the state that substantially reaches capacity, and the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 12% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon-dioxide SiO
2content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
Experiment nine
When 900ppm < α≤1000ppm, the dosage of the modification agent adding before tapping is 2000kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, with respect to experiment eight, can promote reaction efficiency, slag effect is spattered in strengthening.Modification agent can guarantee faster reaction efficiency all the time in high level level simultaneously, and then slag is efficiently spattered in realization.
Magnesium oxide MgO content is 55%, guarantees that in slag, magnesium oxide MgO content can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thereby guarantees that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, can guarantee reaction between carbon and oxygen, realize the deoxygenation of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby slag promotes fusing point, reduce the content of all kinds of low melting point wustites, guarantee that furnace lining possesses certain corrosion resistance, guarantee slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon-dioxide SiO
2content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
Embodiment tetra-
Experiment ten
When α > 1000ppm, the dosage of the modification agent adding before tapping is 2000kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, guarantee Minimum requirements amount.
Magnesium oxide MgO content is 60%, guarantees that in slag, magnesium oxide MgO content is in high level, and completely saturated, the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 15% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.But iron protoxide FeO content is unsuitable too low, as too low in FeO content in pomace, can causes again converter slag-making and remove P, S difficulty.Therefore in operation, must strictly control FeO content in slag.Given this, carbon C content maximum occurrences 15%.
Wherein, the content 10% of calcium oxide CaO, silicon-dioxide SiO
2content 5%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in high level, can fully react it, promotes slag splashing effect.
Test 11
When α > 1000ppm, the dosage of the modification agent adding before tapping is 2250kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, with respect to experiment ten, can promote reaction efficiency, slag effect is spattered in strengthening.
Magnesium oxide MgO content is 57%, guarantees magnesium oxide MgO content high level in slag, the state that substantially reaches capacity, and the meltage of the magnesium oxide MgO in furnace lining is lower, thereby guarantees that furnace lining possesses better erosion prevention, reaches the slag splashing effect of strengthening; Slag possesses good viscosity simultaneously, and can be stable be attached on furnace wall, strengthens its corrosion resistance, strengthening slag splashing ability.
The content 12% of carbon C in modification agent, under the prerequisite mixing, can guarantee sufficient reaction between carbon and oxygen, can significantly promote the deoxygenation efficiency of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby significantly slag promotes fusing point, reduce the content of all kinds of low melting point wustites, reduce slag fluidity, slag is more easily attached on furnace lining, guarantees that furnace lining possesses superior corrosion resistance, strengthening slag splashing effect.
Wherein, the content 7% of calcium oxide CaO, silicon-dioxide SiO
2content 4%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
Test 12
When α > 1000ppm, the dosage of the modification agent adding before tapping is 2500kg; Now can guarantee amounts of reactants, realize the pre-deoxidation of converter finishing slag, under the prerequisite mixing, with respect to experiment 11, can promote reaction efficiency, slag effect is spattered in strengthening.Modification agent can guarantee faster reaction efficiency all the time in high level level simultaneously, and then slag is efficiently spattered in realization.
Magnesium oxide MgO content is 55%, guarantees that in slag, magnesium oxide MgO content can complete reaction, and the meltage of the magnesium oxide MgO in furnace lining will reduce, thereby guarantees that furnace lining possesses certain erosion prevention, reaches slag splashing effect.
The content 10% of carbon C in modification agent, can guarantee reaction between carbon and oxygen, realize the deoxygenation of iron protoxide FeO in slag, reduce the content of iron protoxide in slag, make it in lower standard, thereby slag promotes fusing point, reduce the content of all kinds of low melting point wustites, guarantee that furnace lining possesses certain corrosion resistance, guarantee slag splashing effect.
Wherein, the content 5% of calcium oxide CaO, silicon-dioxide SiO
2content 3%, all the other are a small amount of impurity.The content of magnesium oxide MgO and carbon C, in higher level, can fully react it, promotes slag splashing effect.
All after-blow heats, add modification agent scope to be: 1500kg～2000kg before tapping.Thereby, spatter under the prerequisite of slag effect guaranteeing, reduce strong oxidizing property slag and spatter the consumption of slag slag charge, promote and spatter slag efficiency simultaneously, improved and spattered slag and cannot not spatter dryly, halfway problem.
The working method that adds modification agent before the tapping that the embodiment of the present invention provides by measuring the terminal oxygen level of converter smelting endpoint, and on this basis, adds a certain amount of modification agent to carry out pre-deoxidation to converter finishing slag in converter, has strengthened slag splashing effect; Meanwhile, greatly reduce strong oxidizing property slag and spatter the consumption of slag slag charge, promote simultaneously and spatter slag efficiency, improved and spattered slag and cannot not spatter dryly, halfway problem.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (3)
1. before tapping, add a working method for modification agent, it is characterized in that, comprise the following steps:
The converter smelting catch carbon of reaching home;
Measure terminal oxygen level α;
According to terminal oxygen level α, in stove, add modification agent;
Carry out converter tapping operation;
After converter tapping finishes, carry out slag splashing operation;
Wherein, when α≤800ppm, the scope of the modification agent adding before tapping is 500kg～1000kg;
When 800ppm < α≤900ppm, the scope 1000kg～1500kg of the modification agent adding before tapping;
When 900ppm < α≤1000ppm, the scope of the modification agent adding before tapping is 1500kg～2000kg;
When α > 1000ppm, the scope of the modification agent adding before tapping is 2000kg～2500kg;
All after-blow heats, add modification agent scope to be: 1500kg～2000kg before tapping.
2. before tapping as claimed in claim 1, add the working method of modification agent, it is characterized in that, described modification agent comprises: magnesium oxide MgO, calcium oxide CaO, silicon-dioxide SiO
2, 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%, the content range of described silicon-dioxide SiO2 is: 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 working method of modification agent, it is characterized in that: described terminal oxygen level α measures by TSO auxiliary lance probe.
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| CN104745761A (en) * | 2015-04-23 | 2015-07-01 | 攀钢集团研究院有限公司 | Method for carrying out slag regulation at endpoint of semisteel smelting converter |
| 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 |
| CN105463152A (en) * | 2015-12-07 | 2016-04-06 | 北京首钢股份有限公司 | 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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