CN113136479A - Method for desulfurizing semi-steel steelmaking converter after furnace - Google Patents
Method for desulfurizing semi-steel steelmaking converter after furnace Download PDFInfo
- Publication number
- CN113136479A CN113136479A CN202110426655.5A CN202110426655A CN113136479A CN 113136479 A CN113136479 A CN 113136479A CN 202110426655 A CN202110426655 A CN 202110426655A CN 113136479 A CN113136479 A CN 113136479A
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- China
- Prior art keywords
- steel
- steelmaking converter
- oxygen
- post
- slag
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Classifications
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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
- 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
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a method for post-furnace desulfurization of a semisteel steelmaking converter. The invention provides a method for post-furnace desulfurization of a semisteel steelmaking converter, which aims at solving the problems that the existing semisteel steelmaking converter has serious resulfurization and needs to control resulfurization, and comprises the following steps: when tapping is carried out by a converter, controlling the end point carbon to be 0.05-0.08%, and controlling the end point temperature to be: 1660-1680 ℃, and the end-point oxygen activity: 500-600 ppm, a sliding plate slag stopping system is adopted in the tapping process, and the slag discharging amount of a steel ladle is controlled within 20 mm; adding calcium carbide and a slag modifier into a steel ladle in the tapping process, wherein the adding amount of the calcium carbide is 3-5 kg/t of steel, the adding speed is 160kg/min, the adding amount of the slag modifier is 2-5 kg/t of steel, argon is blown into the steel ladle in the whole process, and the argon flow is 0.005m3/(min·tSteel) Then, oxygen is determined on a small platform, and an aluminum wire is fed after oxygen determination. The method can reduce tappingThe oxygen content in the process further reduces the amount of sulfur return.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for post-furnace desulfurization of a semisteel steelmaking converter.
Background
The steel-making vanadium converter adopts semisteel to make steel, and because the Si content in the semisteel is trace, the C content is lower than that of molten iron and the heat source is insufficient, compared with the molten iron steel-making, the semisteel steel-making needs to add SiO-containing material2FeO and Fe2O3In the composite slag, more oxygen needs to be additionally blown to meet the requirement of end point temperature control in the later control of smelting, so that the end point molten steel for semisteel making has lower C content and higher oxygen activity, and the average value of the end point oxygen content is 650 ppm. The converter resulfurization is caused by the higher end point oxygen content. At present, no solution for the resulfurization problem of the semisteel steelmaking converter exists, and the development of a method for the post-furnace desulfurization of the semisteel steelmaking converter is extremely important.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing semisteel steelmaking converter has serious resulfurization and needs to control the resulfurization.
The technical scheme for solving the technical problems comprises the following steps: provides a method for desulfurizing semi-steel steelmaking converter furnace. The method comprises the following steps:
when tapping is carried out by a converter, controlling the end point carbon to be 0.05-0.08%, and controlling the end point temperature to be: 1660-1680 ℃, and the end-point oxygen activity: 500-600 ppm, a sliding plate slag stopping system is adopted in the tapping process, and the slag discharging amount of a steel ladle is controlled within 20 mm;
adding calcium carbide and a slag modifier into a steel ladle in the tapping process, wherein the adding amount of the calcium carbide is 3-5 kg/t of steel, the adding speed is 160kg/min, the adding amount of the slag modifier is 2-5 kg/t of steel, argon is blown into the steel ladle in the whole process, and the argon flow is 0.005m3/min·tSteelThen, oxygen is determined on a small platform, and an aluminum wire is fed after oxygen determination.
In the method for desulfurizing the semi-steel steelmaking converter after the converter is fired, the feeding standard of the aluminum wire is as follows: when the oxygen activity of the molten steel is less than or equal to 100ppm, feeding 150 m; feeding 200m when the oxygen activity of the molten steel is 100-200 ppm; feeding 300m when the oxygen activity of the molten steel is 200-300 ppm; when the oxygen activity of the molten steel is more than 300, 450m is fed.
In the method for desulfurizing the semi-steel steelmaking converter after the converter is fired, the aluminum iron is aluminum iron containing 36-44% of Al and 54-60% of Fe.
In the method for post-furnace desulfurization of the semisteel steelmaking converter, 70-80% of CaC is contained in calcium carbide2，15～20％CaO。
The aluminum wire is a deoxidizing material commonly used for steel making, contains not less than 90% of metal Al based on the weight of the aluminum wire, and has a diameter of 10 mm.
In the method for desulfurizing the semi-steel steelmaking converter after the converter is fired, the aluminum wire contains 99.1-99.5% of aluminum.
In the method for the post-furnace desulfurization of the semisteel steelmaking converter, the content of CaO in the slag modifier is 20-30%, and Al is added2O340-60.0% of Fe2O310-20% of MAl, not less than 15%, not more than 0.05% of P, not more than 0.15% of S, SiO2≤5～15％。
The invention has the beneficial effects that:
the method changes the deoxidation method in the semisteel steelmaking converter, adopts the calcium carbide for deoxidation in the tapping process, then adds the aluminum wire in the small platform for oxygen determination, and simultaneously adds the slag modifier to achieve the desulfurization operation, so that the oxygen content in the tapping process can be reduced, and further the sulfur return amount is reduced.
Detailed Description
The original treatment process comprises the steps of molten iron pretreatment, top and bottom combined blown converter, LF (ladle furnace) continuous casting, wherein the operation after the converter is to add aluminum and iron into a ladle for deoxidation, and add lime, aluminum particles and other slagging materials into the LF for reduction and desulfurization.
According to the invention, particularly, in the tapping process, after the calcium carbide is adopted for deoxidation, the aluminum wire is added on a small platform for oxygen determination, and meanwhile, the slag modifier is added to achieve the aim of desulfurization, so that the desulfurization can be more effectively realized, the sulfur return amount is controlled, and the desulfurization effect is better.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example the method of the invention is adopted to carry out desulfurization on a semisteel steelmaking converter
Making steel by adopting semisteel in a 120t converter, smelting SPHC steel, measuring the oxygen activity of molten steel at the end point, and initially deoxidizing by adopting calcium carbide in the tapping process; and secondly, adjusting the deoxidation degree by feeding an aluminum wire through a small platform station.
The comparative example is that only ferro-aluminium is added to deoxidize in the deoxidation process, the deoxidation is completed in one step, and the deoxidation degree is required according to the specification of a steel mill.
TABLE 1 parameters during desulfurization of examples and comparative examples
As can be seen from the above examples, the method of the present invention can make the desulfurization rate after the furnace reach more than 40%.
Claims (6)
1. The method for desulfurizing the semisteel steelmaking converter after the converter is characterized by comprising the following steps of:
when tapping is carried out by a converter, controlling the end point carbon to be 0.05-0.08%, and controlling the end point temperature to be: 1660-1680 ℃, and the end-point oxygen activity: 500-600 ppm, a sliding plate slag stopping system is adopted in the tapping process, and the slag discharging amount of a steel ladle is controlled within 20 mm;
adding calcium carbide and a slag modifier into a steel ladle in the tapping process, wherein the adding amount of the calcium carbide is 3-5 kg/t of steel, the adding speed is 160kg/min, the adding amount of the slag modifier is 2-5 kg/t of steel, argon is blown into the steel ladle in the whole process, and the argon flow is 0.005m3/min·tSteelThen, oxygen is determined on a small platform, and an aluminum wire is fed after oxygen determination.
2. The method for post-furnace desulfurization of a semisteel steelmaking converter according to claim 1, characterized in that: the aluminum wire feeding standard is as follows: when the oxygen activity of the molten steel is less than or equal to 100ppm, feeding 150 m; feeding 200m when the oxygen activity of the molten steel is 100-200 ppm; feeding 300m when the oxygen activity of the molten steel is 200-300 ppm; when the oxygen activity of the molten steel is more than 300, 450m is fed.
3. The method for post-furnace desulfurization of a semisteel steelmaking converter according to claim 1, characterized in that: the aluminum iron is aluminum iron containing 36-44% of Al and 54-60% of Fe.
4. The method for post-furnace desulfurization of a semisteel steelmaking converter according to claim 1, characterized in that: the calcium carbide contains 70-80% of CaC2，15～20％CaO。
5. The method for post-furnace desulfurization of a semisteel steelmaking converter according to claim 1, characterized in that: the aluminum wire contains 99.1-99.5% of aluminum.
6. The method for post-furnace desulfurization of a semisteel steelmaking converter according to claim 1, characterized in that: the slag modifier contains 20-30% of CaO and Al2O340-60.0% of Fe2O310-20% of MAl, not less than 15%, not more than 0.05% of P, not more than 0.15% of S, SiO2≤5～15％。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110426655.5A CN113136479A (en) | 2021-04-20 | 2021-04-20 | Method for desulfurizing semi-steel steelmaking converter after furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110426655.5A CN113136479A (en) | 2021-04-20 | 2021-04-20 | Method for desulfurizing semi-steel steelmaking converter after furnace |
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| CN113136479A true CN113136479A (en) | 2021-07-20 |
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| CN202110426655.5A Pending CN113136479A (en) | 2021-04-20 | 2021-04-20 | Method for desulfurizing semi-steel steelmaking converter after furnace |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN104060045A (en) * | 2013-10-24 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method using vanadium-titanium molten iron for smelting low oxygen low carbon IF (interstitial-free) steel |
| CN108913846A (en) * | 2018-08-30 | 2018-11-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Sulfur method after semi-steel making Converter |
| CN109022666A (en) * | 2018-08-30 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Reduce Al in aluminum killed steel2O3The method of deoxidation being mingled with |
-
2021
- 2021-04-20 CN CN202110426655.5A patent/CN113136479A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103205524A (en) * | 2013-04-15 | 2013-07-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting low-sulfur steel from semi-steel |
| CN104060045A (en) * | 2013-10-24 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method using vanadium-titanium molten iron for smelting low oxygen low carbon IF (interstitial-free) steel |
| CN108913846A (en) * | 2018-08-30 | 2018-11-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Sulfur method after semi-steel making Converter |
| CN109022666A (en) * | 2018-08-30 | 2018-12-18 | 攀钢集团攀枝花钢铁研究院有限公司 | Reduce Al in aluminum killed steel2O3The method of deoxidation being mingled with |
Non-Patent Citations (1)
| Title |
|---|
| 雷建: "含钒钛铁水KR脱硫工艺优化", 《山东冶金》 * |
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Application publication date: 20210720 |