CN112961960B - Process method for improving abnormal condition of slag discharge during tapping - Google Patents
Process method for improving abnormal condition of slag discharge during tapping Download PDFInfo
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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
- C21C7/06—Deoxidising, e.g. killing
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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
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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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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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
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
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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
- C21C7/072—Treatment with gases
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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
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a process method for improving abnormal tapping slag conditions, which comprises the following steps: tapping by a converter, and deslagging after slag stopping failure; adding a deoxidizer, a thick slag modifier and refined lime into the molten steel; entering a CAS refining furnace, adding aluminum particles into molten steel top slag for deoxidation, adding a molten steel heat preservation agent, and stirring by adopting strong argon blowing for at least a first argon blowing time; closing argon gas for oxygen determination, supplementing and feeding an aluminum wire after oxygen determination, blowing argon for temperature adjustment, carrying out calcium treatment after soft argon blowing, and adding a molten steel heat preservation agent after the soft argon blowing lasts for more than the second argon blowing time. According to the invention, the aluminum particles and the molten steel heat insulating agent are added in the refining process, so that the deoxidation modification effect of the top slag is improved, the capacity of absorbing impurities of the top slag is improved, and molten steel impurities are fully removed; meanwhile, the method is also beneficial to preventing the molten steel from secondary oxidation caused by the fact that the molten steel is exposed to absorb oxygen in air, the cleanliness of the molten steel is improved, the castability of the molten steel is improved, and the quality of casting blanks is improved.
Description
Technical Field
The invention belongs to the technical field of steel smelting, and particularly relates to a process method for improving abnormal slag tapping during tapping.
Background
The method is characterized in that molten steel is refined outside a furnace, aiming at the technical route of converter blowing, ladle argon blowing and continuous casting, and the condition of abnormal slag discharging caused by slag blocking failure in the process of converter smelting and tapping is that the oxygen content in slag is increased, so that the molten steel is secondarily oxidized, oxide inclusions are increased, and the quality of the molten steel is deteriorated. In order to reduce secondary oxidation of oxygen in slag on molten steel, a top slag modification method is usually adopted in response to the abnormal condition of slag blocking failure in the smelting and tapping process of a converter, but the existing method has poor top slag modification effect, and even if the addition of a slag thickening agent and a deoxidation modifier is increased, the deoxidation modification effect is influenced due to top slag crusting and high top slag viscosity, so that the purity of the molten steel is influenced, and production accidents and the quality of steel billets are reduced.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a process for improving abnormal slag tapping during tapping, which is used to solve the problem of poor molten steel purity when slag stopping fails in the converter smelting tapping process in the prior art, so as to improve the slag-removing oxygen effect and sufficiently remove inclusions.
In order to achieve the above objects and other related objects, the present invention provides a process for improving abnormal slag discharge during tapping, which comprises the following steps:
1) tapping by a converter, and discharging slag due to slag stopping failure in the tapping process;
2) adding a deoxidizer, a thick slag modifier and refined lime into the molten steel;
3) entering a CAS refining furnace, adding aluminum particles into molten steel top slag for deoxidation, adding a molten steel heat preservation agent, and stirring by adopting strong argon blowing for at least a first argon blowing time;
4) closing argon gas for oxygen determination, feeding an aluminum wire after oxygen determination, blowing argon for temperature regulation of molten steel, performing calcium treatment after soft argon blowing, and adding a molten steel heat preservation agent after the soft argon blowing lasts for more than the second argon blowing time;
5) and (5) exiting.
Further, in the step 2), the addition amount of the deoxidizer is set according to the end-point oxygen content of the converter, the addition amount of the dense slag modifier is 2-2.5 kg/t of molten steel, and the addition amount of the refined lime is 3-6 kg/t of molten steel.
Further, in the step 2), the components of the thick slag modifier mainly comprise CaO and partial Al 2 O 3 、CaF 2 And SiO 2 。
Further, in the step 3), the aluminum particles and the molten steel heat-insulating agent are required to be uniformly paved on the slag surface of the molten steel; the adding amount of the aluminum particles is 2.5-20.0 kg/t slag, and the adding amount of the molten steel heat-insulating agent is 0.4-0.6 kg/t molten steel.
Further, in the step 3), the molten steel heat preservation agent mainly comprises SiO 2 And part of FCd, Al 2 O 3 、Fe 2 O 3 And MgO.
Further, in the step 3), the granularity of the molten steel heat-preserving agent is less than or equal to 3mm, and the number of the granularity of less than or equal to 1mm is less than or equal to 20%.
Further, in the step 3), the argon blowing intensity of the strong argon blowingThe degree is 0.3-0.6 Nm/min 3 The amount of argon blown into molten steel is 1.0-2.0 Nm 3 And (2) molten steel, wherein the first argon blowing time is 3 min.
Further, in the step 4), the feeding amount of the aluminum wire is 0-1.5 m/t molten steel.
Further, in the step 4), the argon blowing intensity is 0.2-0.6 Nm/min when the molten steel is subjected to argon blowing temperature regulation 3 Pert molten steel, the argon blowing amount is 0.6Nm 3 The temperature range of the molten steel after argon blowing and temperature regulation is 1570-1590 ℃.
Further, in the step 4), the feeding amount of the calcium silicate wire in the calcium treatment process is 3.0-4.0 m/t molten steel, so that [ Ca ] in the molten steel after the calcium treatment is ensured]/[Al]Not less than 0.09; the argon blowing intensity of the soft argon blowing is 0.05-0.2 Nm/min 3 The second argon blowing time is 5 min; the addition amount of the molten steel heat preservation agent is 0.5-1.0 kg/t molten steel.
As mentioned above, the process method for improving the abnormal condition of tapping slag of the invention has the following beneficial effects:
by adding aluminum particles and a molten steel heat insulating agent in the refining process, the deoxidation modification effect of the top slag is improved, the capacity of absorbing impurities of the top slag is improved, and molten steel impurities are fully removed; meanwhile, the method is also beneficial to preventing the molten steel from secondary oxidation caused by the fact that the molten steel is exposed to absorb oxygen in air, the cleanliness of the molten steel is improved, the castability of the molten steel is improved, and the quality of a casting blank is improved; the process method does not need to add additional equipment or cost, only optimizes the refining operation, and has strong operability, good effect and strong stability.
Drawings
Fig. 1 is a process flow diagram provided in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Referring to the process route of converter blowing, ladle argon blowing and continuous casting, the invention provides a process for improving abnormal slag discharging during tapping, which is shown in figure 1.
The method specifically comprises the following steps:
1) tapping by the converter, and slagging due to slag stopping failure in the tapping process.
The tapping temperature of the converter is set according to different steel grades, and specifically is 1600-1650 ℃.
2) And adding a deoxidizer, a thick slag modifier and refined lime into the molten steel to perform top slag deoxidation and modification.
In the step 2), the addition amount of the deoxidizer is set according to the end-point oxygen content of the converter, the addition amount of the heavy slag modifier is 2-2.5 kg/t molten steel, and the addition amount of the refined lime is 3-6 kg/t molten steel. Specifically, the deoxidizer can be aluminum pellets, aluminum-iron alloy or silicon-calcium-barium-aluminum alloy. In this embodiment, the deoxidizer is aluminum. The addition amount of the heavy slag modifier is based on the premise that 210 tons of molten steel are added into a furnace by 400kg, the addition amount of the refined lime in a converter-argon station-casting machine process route is 600-1200 kg/furnace, namely 3-6 kg/t of molten steel, and the addition amount of the heavy slag modifier in a converter-LF furnace-casting machine process route or a converter-LF furnace-RH furnace-casting machine process route is 800-1200 kg/furnace, namely 4-6 kg/t of molten steel. The main component of the dense slag modifier contains CaO and the second component contains Al 2 O 3 And CaF 2 Containing small amounts of SiO 2 . Specifically, the physical and chemical indexes are as follows: CaO is greater than or equal to 66%, SiO 2 ≤5.0％，S≤0.14，CaF 2 ≥4.0％，Al 2 O 3 Not less than 14 ℃, the melting point of the dense slag modifier is not more than 1400 ℃, and the total water content is not more than 1.6%. The particle size requirement of the dense slag modifier meets 10-30 mm, wherein the proportion of the thick slag modifier smaller than 10mm and larger than 30mm is less than or equal to 5%.
3) And (3) entering a CAS refining furnace, adding aluminum particles into molten steel top slag for deoxidation, adding a molten steel heat preservation agent, and stirring by adopting strong argon blowing for at least the first argon blowing time.
In the step 3), the aluminum particles and the molten steel heat-insulating agent are required to be uniformly spread on the slag surface of the molten steel. The adding amount of the aluminum particles is 2.5-20.0 kg/t slag, and the adding amount of the molten steel heat-preserving agent is 0.4-0.6 kg/t molten steel. Specifically, the amount of aluminum particles added during deoxidation of the slag is shown in the following table:
| content of (FeO + MnO) in slag | 4％ | 5％ | 6％ | 7％ | 8％ | 9％ | 10％ | 11％ |
| During slag deoxidation, the adding amount of aluminum particles is kg/ton of slag | 2.5 | 5.0 | 7.5 | 10.0 | 12.5 | 15.0 | 17.5 | 20.0 |
The main component of the molten steel heat-preserving agent is SiO 2 Containing a small amount of FCd and Al 2 O 3 、Fe 2 O 3 And MgO. Specifically, the physical and chemical indexes are as follows: FCd is less than or equal to 2 percent, SiO 2 ≥86％，Al 2 O 3 ≤1.0％，Fe 2 O 3 Less than or equal to 2.0 percent and less than or equal to 0.5 percent of MgO. The ratio of the absorbed water is less than or equal to 2.0 percent, and the volume density is less than or equal to 300Kg/m 3 The melting point is not less than 1450 ℃. The granularity of the molten steel heat-insulating agent is less than or equal to 3mm, and the quantity of the granularity of less than or equal to 1mm accounts for less than or equal to 20%. The molten steel heat insulating agent should be clean and dry, and should have good spreadability and good heat insulating performance.
After adding deoxidation materials such as aluminum particles and molten steel heat insulating agent, the stirring intensity is operated according to the strong argon blowing stirring intensity. The blowing strength of the strong blowing argon is 0.3-0.6 Nm/min 3 The amount of argon blown into molten steel is 1.0-2.0 Nm 3 And/t molten steel, wherein the first argon blowing time is 3 min.
4) Closing argon gas for oxygen determination, supplementing and feeding an aluminum wire after oxygen determination, then blowing argon for temperature regulation on the molten steel, carrying out calcium treatment after soft argon blowing is adopted, and adding a molten steel heat preservation agent after the soft argon blowing lasts for more than the second argon blowing time.
In the step 4), feeding the aluminum wire after oxygen determination according to the oxygen determination result, wherein the feeding amount of the aluminum wire is 0-1.5 m/t molten steel in the aluminum wire feeding process. Specifically, the feeding amount of the aluminum wire is 0-0.5 m/t molten steel in general; the abnormal condition can reach 1.5m/t molten steel. Then, the argon blowing intensity is 0.2-0.6 Nm/min when the molten steel is subjected to argon blowing temperature regulation 3 The amount of argon blown into molten steel is ensured to be 0.6 Nm/t 3 And (2) adjusting the temperature of the molten steel to the temperature required by the tapping of the refining furnace in the argon station (different according to steel types and steel ladle grades) through an argon blowing temperature adjusting procedure, wherein the temperature range of the molten steel after argon blowing temperature adjustment in the argon station is 1570-1590 ℃. The temperature adjusting range can be adjusted to be 10-20 ℃.
Then, the argon gas is adjusted to soft argon blowing, and the argon blowing intensity of the soft argon blowing is 0.05-0.2 Nm/min 3 And/t molten steel. The molten steel is subjected to calcium treatment by feeding calcium-silicon wires (or calcium-iron wires,Pure calcium wire) for inclusion Al in steel 2 O 3 、SiO 2 And (4) performing denaturation treatment. On one hand, sulfur and calcium in steel form CaS inclusion, the generation total amount of MnS in the solidification process of molten steel is inhibited, and the influence of the MnS inclusion on the quality of steel is reduced; on the other hand, the calcium treatment process can ensure that the deoxidation product of the aluminum deoxidized steel is brittle Al 2 O 3 The inclusion is denatured into low-melting-point calcium aluminate inclusion which is easy to float upwards and be removed in the molten steel, and the molten steel can be purified, the problem of water gap blockage in the casting process caused by high-melting-point oxide inclusion can be solved, and the castability of the molten steel can be improved. The feeding amount of the calcium silicate wire in the calcium treatment process is 3.0-4.0 m/t molten steel, so that [ Ca ] in the molten steel after the calcium treatment is ensured]/[Al]Not less than 0.09. The calcium silicate wire is an inner-drawing wire disc, the outer iron sheet is 08Al or Q195L, the thickness of the iron sheet is 0.3-0.4 mm, and the outer diameter of the calcium silicate wire is 13+0.6 mm. The weight of the calcium silicate wire core powder is more than or equal to 210 g/m.
And then, adding a molten steel heat-preserving agent after soft argon blowing is carried out for more than 5min, wherein the adding amount of the molten steel heat-preserving agent is 0.5-1.0 kg/t of molten steel. If the steel ladle is covered for heat preservation, the molten steel heat preservation agent can not be added after the soft argon blowing is finished.
6) And (5) exiting.
After the process is carried out, the top slag property is improved, so that the slag deoxidation effect is improved, the content of FeO (decaMnO) in slag can be reduced to be within 5%, the content of total oxygen T.O in steel can be reduced to be within 70ppm, the molten steel cleanliness is improved, the molten steel castability is improved, and the casting blank quality is improved.
In conclusion, in the process method for improving the abnormal condition of tapping slag provided by the embodiment of the invention, the aluminum particles and the molten steel heat insulating agent are added in the refining process, so that the deoxidation modification effect of the top slag is improved, the capacity of absorbing impurities by the top slag is improved, and the molten steel impurities are fully removed; meanwhile, the method is also beneficial to preventing the molten steel from secondary oxidation caused by the fact that the molten steel is exposed to absorb oxygen in air, the cleanliness of the molten steel is improved, the castability of the molten steel is improved, and the quality of a casting blank is improved; the process method does not need to add extra equipment or cost, only optimizes the refining operation, and has strong operability, good effect and strong stability.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A process method for improving abnormal condition of tapping slag is characterized by comprising the following steps:
1) tapping by a converter, and discharging slag due to slag stopping failure in the tapping process;
2) adding a deoxidizer, a thick slag modifier and refined lime into molten steel, wherein the thick slag modifier mainly comprises CaO and partial Al 2 O 3 、CaF 2 And SiO 2 ；
3) Entering a CAS refining furnace, adding aluminum particles into molten steel top slag for deoxidation, then adding a molten steel heat insulating agent, and adopting strong argon blowing stirring for at least a first argon blowing time, wherein the first argon blowing time is 3 min;
4) closing argon gas for oxygen determination, supplementing an aluminum wire after oxygen determination, then blowing argon for temperature regulation on the molten steel, performing calcium treatment after soft argon blowing is adopted, and adding a molten steel heat preservation agent after the soft argon blowing lasts for more than a second argon blowing time, wherein the second argon blowing time is 5 min;
5) exiting;
in the step 3), the aluminum particles and the molten steel heat-insulating agent are uniformly paved on the top slag surface of the molten steel; the adding amount of the aluminum particles is 2.5-20.0 kg/t slag, and the adding amount of the molten steel heat-insulating agent is 0.4-0.6 kg/t molten steel;
the molten steel heat insulating agent mainly comprises SiO 2 And part of FCd, Al 2 O 3 、Fe 2 O 3 And MgO.
2. The process method for improving abnormal tapping condition according to claim 1, wherein the process method comprises the following steps: in the step 2), the addition amount of the deoxidizer is set according to the end-point oxygen content of the converter, the addition amount of the heavy slag modifier is 2-2.5 kg/t molten steel, and the addition amount of the refined lime is 3-6 kg/t molten steel.
3. The process method for improving abnormal tapping condition according to claim 1, wherein the process method comprises the following steps: in the step 3), the granularity of the molten steel heat-preserving agent is less than or equal to 3mm, and the number of the granularity of less than or equal to 1mm is less than or equal to 20%.
4. The process method for improving abnormal slag tapping condition in steel tapping according to claim 1, wherein the process method comprises the following steps: in the step 3), the argon blowing intensity of the strong argon blowing is 0.3-0.6 Nm/min 3 Per ton molten steel, the argon blowing amount is 1.0-2.0 Nm 3 And/t molten steel.
5. The process method for improving abnormal tapping condition according to claim 1, wherein the process method comprises the following steps: in the step 4), the feeding amount of the aluminum wire is 0-1.5 m/t molten steel.
6. The process method for improving abnormal slag tapping condition in steel tapping according to claim 1, wherein the process method comprises the following steps: in the step 4), the argon blowing intensity is 0.2-0.6 Nm/min when the molten steel is subjected to argon blowing and temperature regulation 3 Pert molten steel, the argon blowing amount is 0.6Nm 3 The temperature range of the molten steel after argon blowing and temperature adjustment is 1570-1590 ℃.
7. The process method for improving abnormal slag tapping condition in steel tapping according to claim 1, wherein the process method comprises the following steps: in the step 4), the feeding amount of the calcium silicate wire in the calcium treatment process is 3.0-4.0 m/t molten steel, so that [ Ca ] in the molten steel after the calcium treatment is ensured]/[Al]Not less than 0.09; the argon blowing intensity of the soft argon blowing is 0.05-0.2 Nm/min 3 The amount of molten steel is/t; the addition amount of the molten steel heat preservation agent is 0.5-1.0 kg/t molten steel.
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| CN102134628B (en) * | 2011-03-04 | 2013-04-17 | 河北钢铁股份有限公司承德分公司 | Smelting method of low-carbon aluminium killed steel with low silicon content |
| KR20140002937A (en) * | 2012-06-28 | 2014-01-09 | 현대제철 주식회사 | Method for preventing slag inclusion in converter steel tapping |
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