CN113122672A - Method for dephosphorizing semisteel steelmaking converter after furnace - Google Patents
Method for dephosphorizing semisteel steelmaking converter after furnace Download PDFInfo
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- CN113122672A CN113122672A CN202110425687.3A CN202110425687A CN113122672A CN 113122672 A CN113122672 A CN 113122672A CN 202110425687 A CN202110425687 A CN 202110425687A CN 113122672 A CN113122672 A CN 113122672A
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- converter
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a method for dephosphorizing at the rear of a semisteel steelmaking converter. The invention provides a method for dephosphorizing after a semisteel steelmaking converter, which is lack of a method for controlling the vortex effect slag at the middle and later stages of semisteel steelmaking and reducing the phosphorus content, and comprises the following steps: a. smelting in a 120t converter, namely adding half steel into the converter, blowing, and adding 20-25 kg/t of active lime, 30-35 kg of high-magnesium lime and 8-12 kg/t of acidic composite slagging agent into the converter; b. the distance between the oxygen lance nozzle and the molten pool metal liquid surface is 1.4-2 m, the converting lance position is 1.4-1.8 m, the blowing lance position is 2m, and the carbon drawing lance position is 1.4 m; c. after blowing is finished, adding 8-10 kg/t of light-burned dolomite steel and 8-10 kg/t of steel slag into a converter before tapping; in the tapping process, infrared slag discharge detection and sliding plate slag stopping are adopted to control the slag discharge amount to be 1-6 kg/t steel; and adding 2-5 kg/t of steel into the ladle in the tapping process. The method can obviously reduce the phosphorus recovery amount and has important significance.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for dephosphorizing at the rear of a semisteel steelmaking converter.
Background
Because the slag is inevitably discharged in the converter tapping process and the slag contains oxides of phosphorus, the oxides of phosphorus in the slag are reduced into steel in the deoxidation and refining processes, and the oxides of phosphorus in the slag can be reduced by reducing the slag discharge amount, thereby reducing the rephosphorization in the steelmaking process. After converter smelting is finished, the next step is tapping operation, because the density of the steel slag is less than that of the molten steel, the steel slag can float on the molten steel, and the slag discharging during converter tapping comprises three stages, namely early-stage slag, vortex effect slag in the tapping process and later-stage slag.
At present, converter tapping slag stopping at home and abroad adopts more methods of blocking early-stage slag by using iron sheet slag stopping caps, soft slag stopping plugs and sliding water gaps; slag blocking balls, slag blocking marks, pneumatic slag blocking and early-stage slag blocking of the sliding water gap; slag stopping balls, slag stopping marks, pneumatic slag stopping and later-stage slag stopping of the sliding water gap; the amount of the slag entrainment and the slag shedding due to the vortex effect at the later period of the tapping process is controlled, and the semi-steel steelmaking needs to add SiO-containing SiO in comparison with the ordinary molten iron steelmaking because the Si content in the semi-steel is a trace and the C content is lower than that of the ordinary molten iron, thereby causing the shortage of a furnace-entering heat source of a converter2FeO and Fe2O3And in the compound slag of the materials, more oxygen needs to be blown in to meet the requirement of end point temperature control in the later control of smelting, so that the C content of molten steel at the end point of semisteel making is lower than that of common molten iron making, the oxygen activity is higher, the slag state is thinner, and the difficulty in controlling slag discharging during tapping is higher.
At present, no method for controlling the slag entrainment amount of the vortex effect in the middle and later period of semisteel steelmaking so as to reduce the phosphorus content exists, and the development is urgently needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the prior art lacks a method for controlling the vortex effect slag at the middle and later stages of semisteel steelmaking so as to reduce the phosphorus content.
The technical scheme for solving the technical problems comprises the following steps: provides a method for dephosphorizing after a semisteel steelmaking converter. The method comprises the following steps:
a. smelting in a 120t converter, namely adding half steel into the converter, blowing, and adding 20-25 kg/t of active lime, 30-35 kg of high-magnesium lime and 8-12 kg/t of acidic composite slagging agent into the converter;
b. the distance between the oxygen lance nozzle and the molten pool metal liquid surface is 1.4-2 m, the converting lance position is 1.4-1.8 m, the blowing lance position is 2m, and the carbon drawing lance position is 1.4 m;
c. after blowing is finished, adding 8-10 kg/t of light-burned dolomite steel and 8-10 kg/t of steel slag into a converter before tapping; in the tapping process, infrared slag discharge detection and sliding plate slag stopping are adopted to control the slag discharge amount to be 1-6 kg/t steel; and adding 2-5 kg/t of steel into the ladle in the tapping process.
In the method for dephosphorizing the semisteel steelmaking converter after the converter, the active lime in the step a is the active lime with the CaO content of 85-90%.
In the method for dephosphorizing the semisteel steelmaking converter after the converter, the high-magnesium lime in the step a is the high-magnesium lime with the CaO content of 48-55% and the MgO content of 30-40%.
In the method for dephosphorizing semisteel steelmaking converter after the converter, the acidic composite slagging agent in the step a contains SiO2：48％，MgO：6％，CaO：12％，TFe：20％，MnO：8％，Al2O3：2％。
In the method for dephosphorizing after the semi-steel steelmaking converter is fired, the steel slag in the step c contains 18-23% of FeO and 8-12% of Fe2O35-10% of MFe, 35-43% of CaO, 10-15% of SiO21 to 3% of Al2O31-2% of MnO, 10-15% of MgO, 0.8-1.3% of P and 0.02-0.05% of S.
Wherein, in the method for dephosphorizing after the semi-steel steelmaking converter is fired, the dolomite in the step c is CaMg (CO)3)2The composition comprises more than or equal to 30.0 percent of CaO, more than or equal to 20.0 percent of MgO, more than or equal to 45.0 percent of CO2, less than 0.01 percent of P and less than 0.01 percent of S; the burning loss is 44.5-47.0. The particle size is 5-20 mm.
In the method for dephosphorizing the semisteel steelmaking converter after the converter is fired, the content of CaO in the slag modifier in the step c is 20-30%, and Al is added2O340-60.0% of Fe2O310-20 percent of MAl, less than or equal to 0.5 percent of P, less than or equal to 0.05 percent of S, less than or equal to 0.15 percent of SiO2≤5～15％。
Wherein, in the method for dephosphorizing after the semi-steel steelmaking converter is heated, the steel ladle is used for steel tapping in the step cArgon blowing is carried out in the whole process, and the flow rate of the argon is 0.003m3/(min·tSteel) And blowing argon for 20min and then slagging off.
The invention has the beneficial effects that:
the invention provides a method for controlling the vortex effect slag entrainment in the middle and later stages of semisteel steelmaking so as to dephosphorize and reduce the phosphorus content. According to the invention, the rapid slagging and the early slagging in the blowing process are controlled by the adding time and the adding amount of the active lime, the high-magnesium lime and the acidic composite slagging agent, the slag is actively melted, and the process is not dried and splashed, so that the dephosphorization effect is good, and the phosphorus content is reduced from 0.010% to 0.006%. The method has simple operation and obvious effect of reducing the phosphorus content, and is suitable for popularization and application in production.
Detailed Description
The technical scheme for solving the technical problems comprises the following steps: provides a method for dephosphorizing after a semisteel steelmaking converter. The method comprises the following steps:
a. smelting in a 120t converter, namely adding half steel into the converter, blowing, and adding 20-25 kg/t of active lime, 30-35 kg of high-magnesium lime and 8-12 kg/t of acidic composite slagging agent into the converter;
b. the distance between the oxygen lance nozzle and the molten pool metal liquid surface is 1.4-2 m, the converting lance position is 1.4-1.8 m, the blowing lance position is 2m, and the carbon drawing lance position is 1.4 m;
c. after blowing is finished, adding 8-10 kg/t of light-burned dolomite steel and 8-10 kg/t of steel slag into a converter before tapping; in the tapping process, infrared slag discharge detection and sliding plate slag stopping are adopted to control the slag discharge amount to be 1-6 kg/t steel; and adding 2-5 kg/t of steel into the ladle in the tapping process.
In the method for dephosphorizing the semisteel steelmaking converter after the converter, the active lime in the step a is the active lime with the CaO content of 85-90%.
In the method for dephosphorizing the semisteel steelmaking converter after the converter, the high-magnesium lime in the step a is the high-magnesium lime with the CaO content of 48-55% and the MgO content of 30-40%.
In the method for dephosphorizing semisteel steelmaking converter after the converter, the acidic composite slagging agent in the step a contains SiO2：48％，MgO：6％，CaO：12％，TFe：20％，MnO：8％，Al2O3：2％。
In the method for dephosphorizing after the semi-steel steelmaking converter is fired, the steel slag in the step c contains 18-23% of FeO and 8-12% of Fe2O35-10% of MFe, 35-43% of CaO, 10-15% of SiO21 to 3% of Al2O31-2% of MnO, 10-15% of MgO, 0.8-1.3% of P and 0.02-0.05% of S.
Wherein, in the method for dephosphorizing after the semi-steel steelmaking converter is fired, the dolomite in the step c is CaMg (CO)3)2The composition comprises more than or equal to 30.0 percent of CaO, more than or equal to 20.0 percent of MgO, more than or equal to 45.0 percent of CO2, less than 0.01 percent of P and less than 0.01 percent of S; the burning loss is 44.5-47.0. The particle size is 5-20 mm.
In the method for dephosphorizing the semisteel steelmaking converter after the converter is fired, the content of CaO in the slag modifier in the step c is 20-30%, and Al is added2O340-60.0% of Fe2O310-20 percent of MAl, less than or equal to 0.5 percent of P, less than or equal to 0.05 percent of S, less than or equal to 0.15 percent of SiO2≤5～15％。
In the method for dephosphorizing semisteel steelmaking converter after the converter, argon is blown to the ladle in the whole process during tapping in the step c, and the argon flow is 0.003m3/(min·tSteel) And blowing argon for 20min and then slagging off.
The invention can accelerate the melting of lime by controlling the adding time and the adding amount of the active lime, the high-magnesium lime and the acidic composite slagging agent. If the addition amount is too much, the temperature of a molten pool is reduced too much, so that slag materials are agglomerated, and a layer of metal skull is formed on the surface of a lime block to delay slagging; if the amount of the phosphorus is too small, the dephosphorization effect cannot be achieved.
On the other hand, the invention controls the position of the blow gun, mainly aiming at preventing the blow gun from burning; and meanwhile, the carbon drawing gun position is controlled, so that the slag is ensured to have good fluidity, the slag is melted early, more phosphorus is removed, and a furnace lining is protected. Wherein the oxygen lance position refers to the distance from the spray head tail end of the oxygen lance spray head to the liquid level of the molten pool.
The overall converting control principle in the invention is as follows: rapid slagging and early slagging, active slag, and no drying or splashing in the process.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1 dephosphorization of a semi-steel steelmaking converter after heat treatment according to the invention
In a 120t converter of a certain factory, semisteel is adopted for steelmaking, the carbon content of the semisteel fed into the converter is 3.5%, the temperature is 1301 ℃, the phosphorus content is 0.074%, 21.5kg/t steel of active lime, 31.2kg of high-magnesium lime and 8.2kg/t steel of an acidic composite slagging agent are added into the converter while blowing is carried out, the adding time and adding amount of slag materials are controlled in the range so as to accelerate the melting of the lime, if the slag materials are added too much, the temperature of a molten pool is reduced too much, the slag materials are agglomerated, and a layer of metal skull is formed on the surface of a lime block to delay slagging; if the amount of the phosphorus is too small, the dephosphorization effect cannot be achieved. After blowing, 8.5kg/t of light-burned dolomite steel and 8.6kg/t of steel slag thick slag are added into the converter before tapping. And the sliding plate is used for pushing off slag to control the slag discharging amount in the tapping process.
The end point steel sample phosphorus is 0.011 percent, and the phosphorus content after slag skimming is 0.0050 percent. Therefore, the method can effectively dephosphorize.
Example 2 dephosphorization of a semi-steel steelmaking converter after heat treatment according to the invention
In a 120t converter of a certain factory, semisteel is adopted for steelmaking, the carbon content of the semisteel fed into the converter is 3.6%, the temperature is 1289 ℃, the phosphorus content is 0.079%, 22.5kg/t steel of active lime, 32.2kg of high-magnesium lime and 8.9kg/t steel of an acidic composite slagging agent are added into the converter while blowing is started, the adding time and adding amount of slag materials are controlled in the range so as to accelerate the melting of the lime, if the slag materials are added too much, the temperature of a molten pool is reduced too much, the slag materials are agglomerated, and a layer of metal skull is formed on the surface of a lime block to delay slagging; if the amount of the phosphorus is too small, the dephosphorization effect cannot be achieved. After blowing, 8.9kg/t of light-burned dolomite steel and 8.82kg/t of steel slag thick slag are added into the converter before tapping. And the sliding plate is used for pushing off slag to control the slag discharging amount in the tapping process.
The end point steel sample phosphorus content is 0.0086%, and the phosphorus content after slag skimming is 0.0055%. Thus, the dephosphorization can be effectively carried out by adopting the method.
Comparative example 3 dephosphorization of semisteel steelmaking converter after-furnace by means of conventional method
In a 120t converter of a certain factory, semisteel is adopted for steelmaking, the carbon content of the semisteel fed into the converter is 3.9%, the temperature is 1310 ℃, the phosphorus content is 0.081%, 22.5kg/t steel of active lime, 32.2kg of high-magnesium lime and 8.6kg/t steel of an acidic composite slagging agent are added into the converter while blowing is started, the adding time and adding amount of slag materials are controlled within the range so as to accelerate the melting of the lime, if the slag materials are added too much, the temperature of a molten pool is reduced too much, the slag materials are agglomerated, and a layer of metal skull is formed on the surface of a lime block to delay slagging; if the amount of the phosphorus is too small, the dephosphorization effect cannot be achieved. After blowing is finished, thick slag operation is not adopted. And the sliding plate is used for pushing off slag to control the slag discharging amount in the tapping process.
The final phosphorus content of the steel sample is 0.0100%, the small platform phosphorus content is 0.013%, and the phosphorus content is 0.003%.
As can be seen from the examples and the comparative examples, the operation of adopting the dense slag reduces the rephosphorization by 0.002 percent on average compared with the operation of not adopting the dense slag, and the rephosphorization amount can be effectively reduced by adopting the dense slag operation.
Claims (8)
1. The method for dephosphorizing the semisteel steelmaking converter after the converter is characterized by comprising the following steps of:
a. smelting in a 120t converter, namely adding half steel into the converter, blowing, and adding 20-25 kg/t of active lime, 30-35 kg of high-magnesium lime and 8-12 kg/t of acidic composite slagging agent into the converter;
b. the distance between the oxygen lance nozzle and the molten pool metal liquid surface is 1.4-2 m, the converting lance position is 1.4-1.8 m, the blowing lance position is 2m, and the carbon drawing lance position is 1.4 m;
c. after blowing is finished, adding 8-10 kg/t of light-burned dolomite steel and 8-10 kg/t of steel slag into a converter before tapping; in the tapping process, infrared slag discharge detection and sliding plate slag stopping are adopted to control the slag discharge amount to be 1-6 kg/t steel; and adding 2-5 kg/t of steel into the ladle in the tapping process.
2. The method for dephosphorization of semisteel steelmaking converter after-furnace according to claim 1, characterized in that: the active lime in the step a is active lime with the CaO content of 85-90%.
3. The method for dephosphorization of semisteel steelmaking converter after-furnace according to claim 1, characterized in that: the high-magnesium lime in the step a is high-magnesium lime with 48-55% of CaO and 30-40% of MgO.
4. The method for dephosphorization of semisteel steelmaking converter after-furnace according to claim 1, characterized in that: the acidic composite slagging agent in the step a contains SiO2：48％，MgO：6％，CaO：12％，TFe：20％，MnO：8％，Al2O3：2％。
5. The method for dephosphorization of semisteel steelmaking converter after-furnace according to claim 1, characterized in that: the steel slag in the step c contains 18-23% of FeO and 8-12% of Fe2O35-10% of MFe, 35-43% of CaO, 10-15% of SiO21 to 3% of Al2O31-2% of MnO, 10-15% of MgO, 0.8-1.3% of P and 0.02-0.05% of S.
6. The method for dephosphorization of semisteel steelmaking converter after-furnace according to claim 1, characterized in that: the dolomite in the step c is CaMg (CO)3)2The composition comprises more than or equal to 30.0 percent of CaO, more than or equal to 20.0 percent of MgO, more than or equal to 45.0 percent of CO2, less than 0.01 percent of P and less than 0.01 percent of S; the burning loss is 44.5-47.0. The particle size is 5-20 mm.
7. The method for dephosphorization of semisteel steelmaking converter after-furnace according to claim 1, characterized in that: the content of CaO in the slag modifier in the step c is 20-30%, and Al2O340-60.0% of Fe2O310-20 percent of MAl, less than or equal to 0.5 percent of P, less than or equal to 0.05 percent of S, less than or equal to 0.15 percent of SiO2≤5～15％。
8. The method for dephosphorization of semisteel steelmaking converter after-furnace according to claim 1, characterized in thatCharacterized in that: c, during tapping, argon is blown into the ladle in the whole process, and the argon flow is 0.003m3/min·tSteelAnd blowing argon for 20min and then slagging off.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114807510A (en) * | 2022-05-09 | 2022-07-29 | 首钢水城钢铁（集团）有限责任公司 | Method for controlling rephosphorization in tapping process of high-titanium molten iron smelted by converter |
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| CN114807510A (en) * | 2022-05-09 | 2022-07-29 | 首钢水城钢铁（集团）有限责任公司 | Method for controlling rephosphorization in tapping process of high-titanium molten iron smelted by converter |
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Application publication date: 20210716 |
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