CN113953473B - Covering slag for continuous casting crystallizer and preparation method thereof - Google Patents
Covering slag for continuous casting crystallizer and preparation method thereof Download PDFInfo
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- CN113953473B CN113953473B CN202111385464.5A CN202111385464A CN113953473B CN 113953473 B CN113953473 B CN 113953473B CN 202111385464 A CN202111385464 A CN 202111385464A CN 113953473 B CN113953473 B CN 113953473B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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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
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- Continuous Casting (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The application relates to the field of cast steel, and particularly discloses a covering slag for a continuous casting crystallizer and a preparation method thereof. The continuous casting crystallizer casting powder comprises the following components of SiO 2 24.00-31.00 parts of CaO26.00-33.00 parts of Al 2 O 3 5.40-5.70 parts of Fe 2 O 3 Not more than 3.00 parts of MgO not more than 3.00 parts of Na 2 O and Li 2 6.50-10.50 parts of O and CaF 2 3.50-7.50 parts of ZrO 2 4.5-5.5 parts of Y 2 O 3 3.5-4.5 parts; the preparation method comprises the following steps: the components are uniformly mixed and ground to obtain the finished product of the covering slag powder slag, and the covering slag powder slag has the advantage of good heat insulation effect.
Description
Technical Field
The application relates to the field of cast steel, in particular to covering slag for a continuous casting crystallizer and a preparation method thereof.
Background
The crystallizer covering slag is a functional material which influences the quality of a casting blank and the stability of a continuous casting process, and during the casting process of molten steel, granular or powdery covering slag is continuously added on the liquid level of the molten steel of the crystallizer, so that the covering slag forms a three-layer structure comprising a liquid slag layer, a sintered layer and a powder slag layer due to the high temperature of the molten steel. The basic functions of the mold flux are as follows: (1) insulating the heat of the exposed molten steel; (2) preventing secondary oxidation of molten steel; (3) absorbing impurities floating to the surface of molten steel; (4) And a liquid film is filled between the wall of the crystallizer and the shell of the casting blank to play a role in lubrication (5) and control the heat transfer of the casting blank to the crystallizer. The casting powder can effectively solve the problems of longitudinal cracks, depressions, bleed-out and the like on the surface of a steel billet.
At present, the heat insulation effect of the casting powder is not good enough, so that the casting blank is longitudinally cracked due to the fact that the outer wall of the crystallizer is cooled too fast to the casting blank, the phenomenon of affecting the quality of the steel blank is very common, the heat transfer of the casting powder can be effectively controlled by increasing carbon black, the proportion of the added carbon black is not easy to calculate, the proportion of the carbon black is too high, the carbon black easily enters the casting blank, the carbon content of the surface of the casting blank is increased, the quality of the casting blank is affected, the proportion of the carbon black is too low, and the heat transfer process is difficult to control.
Disclosure of Invention
In order to improve the heat insulation effect of the covering slag, the application provides the continuous casting crystallizer covering slag and the preparation method thereof.
The continuous casting crystallizer covering slag and the preparation method thereof adopt the following technical scheme:
in a first aspect, a mold flux for a continuous casting mold comprises SiO as the following component 2 24.00-31.00 parts of CaO26.00-33.00 parts of Al 2 O 3 5.40-5.70 parts of Fe 2 O 3 Not more than 3.00 parts of MgO not more than 3.00 parts of Na 2 O and Li 2 6.50-10.50 parts of O and CaF 2 3.50-7.50 parts of ZrO 2 4.5-5.5 parts of Y 2 O 3 3.5-4.5 parts.
By adopting the technical scheme, the zirconia has the advantages of high melting point, difficult oxidation and the like, has stable chemical property, good heat insulation effect, corrosion resistance and oxidation resistance under specific high-temperature environment, is non-volatile and pollution-free, is a refractory material with good performance,
when the mold flux is added to the liquid level of the molten steel, the mold flux is melted due to the high temperature of the molten steel, and the mold flux forms a three-layer structure, namely a liquid slag layer, a sintered layer and a powder slag layer. Because the crystallizer rocks, make and form the gap between casting blank and the crystallizer wall, the liquid slag layer flows into between casting blank and the crystallizer wall, play the role of lubricating and controlling heat transfer, because add zirconia in the covering slag, zirconia is high temperature resistant, chemical stability, and the heat-proof quality is good, can be better reduce the heat transfer efficiency of covering slag, reduce because the casting blank cooling rate is too fast, thus make the casting blank produce the cracked possibility, in addition, still avoided the phenomenon that the covering slag carburizes to the casting blank surface.
The zirconium oxide is added into the covering slag, the heat transfer efficiency of the covering slag is well controlled, but the zirconium oxide increases the viscosity of a liquid slag layer of the covering slag, and the liquid slag layer is not beneficial to permeating into a gap between a crystallizer and a casting blank, so that the casting blank is not easy to pull out from the crystallizer, and even a viscous breakout accident is caused.
The zirconium oxide and the yttrium oxide have synergistic effect, so that the heat transfer performance of the covering slag is improved, the viscosity of liquid covering slag is not weakened, and the possibility of generating cracks in a casting blank is reduced.
Alternatively, the Na 2 O and Li 2 The weight ratio of 0 is 1:1-2:1.
By adopting the technical scheme, na 2 O and Li 2 O can destroy the chain structure of the casting powder, reduce the viscosity of the liquid slag layer of the casting powder, and simultaneously reduce the crystallization temperature, na 2 O and Li 2 0 weight ratio of 2:1, the protective slag is easy to separate nepheline and is not beneficial to lubrication, and Na 2 O and Li 2 The weight ratio of 0 is less than 1:1, which affects the crystallization rate and vitrification degree of the mold flux.
Optionally, the CaO and SiO 2 In a weight ratio of 0.95:1-1.15:1.
By adopting the technical scheme, caO and SiO 2 The alkalinity is an important index of the reaction protecting slag for absorbing the inclusions in the molten steel, and the alkalinity is properly increased, so that the protecting slag is favorable for absorbing the inclusions in the molten steel.
On the other hand, the preparation method of the continuous casting crystallizer covering slag is to mix SiO 2 24.00-31.00 parts of CaO26.00-33.00 parts of Al 2 O 3 5.40-5.70 parts of Fe 2 O 3 Not more than 3.00 parts of MgO not more than 3.00 parts of Na 2 O and Li 2 6.50-10.50 parts of O and CaF 2 3.50-7.50 parts of ZrO 2 4.5-5.5 parts of Y 2 O 3 3.5 to 4.5 portions of the powder slag of the finished product of the covering slag are obtained after uniform mixing and grinding.
Optionally, the finished mold flux powder is dried.
By adopting the technical scheme, the content of water in the casting powder is reduced, so that the quality of a casting blank is not influenced.
Optionally, the milling process uses a ball mill.
Optionally, the particle size of the finished product of the covering slag powder is 100-200 meshes.
By adopting the technical scheme, the particle density is fine, which is beneficial to melting the casting powder, but the particle density is too fine, so that the liquid film is not beneficial to controlling the heat transfer temperature after passing.
Optionally, the finished mold flux is stored in a dry environment.
In summary, the present application has the following beneficial effects:
1. when the mold flux is added to the liquid level of the molten steel, the mold flux is melted due to the high temperature of the molten steel, and the mold flux forms a three-layer structure, namely a liquid slag layer, a sintered layer and a powder slag layer. Because the crystallizer rocks, make and form the gap between casting blank and the crystallizer wall, the liquid slag layer flows into between casting blank and the crystallizer wall, play the role of lubricating and controlling heat transfer, because add zirconia in the covering slag, zirconia is high temperature resistant, chemical stability, and the heat-proof quality is good, can be better reduce the heat transfer efficiency of covering slag, reduce because the casting blank cooling rate is too fast, thus make the casting blank produce the cracked possibility, in addition, still avoided the phenomenon that the covering slag carburizes to the casting blank surface.
2. CaO and SiO 2 The alkalinity is an important index of the capability of reacting the covering slag to absorb inclusions in the molten steel, and the alkalinity is properly improved, so that the covering slag is favorable for absorbing the inclusions in the molten steel.
Detailed Description
The present application will be described in further detail with reference to examples.
Examples
Example 1
The continuous casting crystallizer casting powder comprises the following components of SiO 2 24.00kg、CaO26.00kg、Al 2 O 3 5.40kg、Fe 2 O 3 3.00kg、MgO3.00kg、Na 2 O and Li 2 06.5kg、CaF 2 3.50-7.50 parts of ZrO 2 4.5-5.5 parts of, Y 2 O 3 3.5-4.5 parts of Na 2 O and Li 2 The weight ratio of 0 is 1:1.
A preparation method of continuous casting crystallizer covering slag comprises the following steps: mixing 24.00kgSiO 2 、26.00kgCaO、5.40kgAl 2 O 3 、3.00kgFe 2 O 3 、3.00kgMgO、3.50kgCaF 2 、4.5kgZrO 2 、3.5kgY 2 O 3 、6.50kgNa 2 O and Li 2 0, uniformly mixing, grinding by using a ball mill, and drying to obtain the finished product of the covering slag powder, wherein the particle size of the finished product of the covering slag powder corresponds to 100 meshes, and Na is contained in the powder 2 O and Li 2 0 weight ratio of 1 2 The weight ratio of (1.08): 1.
examples 2 to 9 and comparative examples 1 to 2
Examples 2 to 9 and comparative examples 1 to 2 are different from example 1 in the ratio of raw materials, and specific ratios of raw materials are shown in tables 1 to 1 and tables 1 to 2.
TABLE 1-1 raw material ratios of examples 2-9 and comparative examples 1-2
Tables 1-1 the mass of each example was set to 1kg and the remaining data were homogeneously expressed as follows:
TABLE 1-2 raw material compounding ratio of examples 2-9 and comparative examples 1-2
Performance test
Viscosity test: and testing the viscosity of the casting powder according to a standard YB/T185-2017 continuous casting powder viscosity test method.
The heat transfer efficiency test method comprises the following steps: and testing the heat flux density of the casting powder by using an HF-200 crystallizer slag film heat flux simulator.
A heat flow test slag film preparation step: at 1300 ℃, 350g of prepared slag materials are uniformly mixed and then put into a graphite crucible, the graphite crucible is added into a silicon-molybdenum furnace, the temperature is raised, the melting and the stirring are uniform, after the temperature of a hearth reaches 1400 ℃, a stirring rod is used for uniformly melting protective slag, a lifting arm is started after the position of a sensor is positioned at the center of the furnace tube to drive a positioning sensor to descend to the slag liquid level, and the sensor can immediately and automatically ascend when contacting the liquid level. And the lifting arm descends again to drive the copper probe to be immersed into the slag liquid, the sensor starts timing, and the sensor below the slag liquid surface is taken out after 80s to obtain a solid liquid film adhered to the sensor and the water temperature of the inlet and the outlet automatically acquired by the computer.
The heat flux density of the slag film is calculated as follows: phi = W.C.DELTA.T/(F.1000)
Phi-heat flow density, mw m -2 (ii) a Cooling water flow rate of W-heat flow sensor, kg.s -1 (ii) a Delta T-temperature difference of water at the inlet and the outlet of the heat flow sensor, DEG C; effective heat transfer area of F-heat flow sensor, m 2 (ii) a C-specific Heat of Water, kg · (kg ℃) -1 。
The following table shows the viscosity and heat flow density for examples 2-9 and comparative examples 1-2:
TABLE 2 viscosity vs. Heat flow Density for examples 2-9 and comparative examples 1-2
Example 2 improved SiO compared to example 1 2 Content of (3), data show, siO 2 In a specific range, siO 2 The content is increased, so that the protective slag forms a glass phase, which is beneficial to lubricating a casting blank;
compared with the embodiment 1, the embodiment 3 improves the content of CaO, and the data show that the content of CaO is in a specific range, the content of CaO is improved, the viscosity of the casting powder is obviously reduced, and the capacity of absorbing impurities is improved;
al in example 4 in comparison with example 1 2 O 3 The content is unchanged, and the viscosity is unchanged;
fe in example 5 compared to example 1 2 O 3 Is reduced, but the viscosity of the mold flux is not changed, which proves that in Fe 2 O 3 The content of (b) does not affect the viscosity of the mold flux within a specific range;
compared with the embodiment 1, the MgO content in the embodiment 6 is reduced, the viscosity of the mold flux is increased, the MgO content is in a specific range, the MgO can reduce the viscosity and the solidifying point of the mold flux, the fluidity of the mold flux is increased, and the chemical stability of the mold flux is favorable;
CaF in example 6 in comparison with example 1 2 The content is reduced, the viscosity of the casting powder is increased, and CaF is increased within a specific content range 2 The content of (3) can reduce the viscosity of the mold flux;
examples 1 and 7 to 8 in combination with comparative examples 1 to 2, it was found that ZrO 2 In a specific range, zrO 2 The content of (2) is increased, the viscosity of the covering slag is increased, and the heat flow density of the covering slag is reduced, so that the heat-insulating property of the covering slag is enhanced, and the possibility of generating cracks on a casting blank due to the fact that the cooling speed of the casting blank is too high is reduced.
Examples 10 to 14 and comparative examples 3 to 4
Examples 10 to 14 and comparative examples 3 to 4 are different from example 1 in the ratio of raw materials, and specific ratios of raw materials are shown in tables 3 to 1 and 3 to 2.
TABLE 3-1 raw material compounding ratios of examples 10 to 14 and comparative examples 3 to 4
The mass of each example is set to 1kg in tables 3-1 and the remaining data are homogeneously expressed as follows:
TABLE 3-2 raw material compounding ratios of examples 10 to 14 and comparative examples 3 to 4
| Example 10 | Example 11 | Example 12 | Example 13 | Example 14 | Comparative example 3 | Comparative example 4 | |
| SiO 2 /kg | 0.30 | 0.29 | 0.30 | 0.33 | 0.29 | 0.32 | 0.29 |
| CaO/kg | 0.32 | 0.31 | 0.33 | 0.31 | 0.33 | 0.34 | 0.32 |
| Al 2 O 3 /kg | 0.07 | 0.06 | 0.07 | 0.07 | 0.07 | 0.07 | 0.07 |
| Fe 2 O 3 /kg | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 |
| MgO/kg | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 |
| CaF 2 /kg | 0.04 | 0.04 | 0.04 | 0.04 | 0.04 | 0.05 | 0.04 |
| ZrO 2 /kg | 0.06 | 0.05 | 0.06 | 0.05 | 0.06 | 0.06 | 0.06 |
| Y 2 O 3 /kg | 0.06 | 0.04 | 0.04 | 0.04 | 0.04 | 0.00 | 0.07 |
| Na 2 O and Li 2 O/kg | 0.08 | 0.13 | 0.08 | 0.08 | 0.08 | 0.09 | 0.08 |
| Na 2 O/Li 2 0 | 1 | 1 | 2 | 1 | 1 | 1 | 1 |
| CaO/SiO 2 | 1.08 | 1.08 | 1.08 | 0.95 | 1.15 | 1.08 | 1.08 |
The following table shows the viscosity and heat flow density for examples 10-14 and comparative examples 3-4:
table 4 viscosity versus heat flow density of examples 10-14 and comparative examples 3-4
Example 10 increased Y compared to example 1 2 O 3 In a specific content range, Y is increased 2 O 3 The viscosity of the mold flux is reduced, and the heat flux density of the mold flux is reduced;
example 1 and example 10 in combination with comparative examples 3 to 4, it was found that within a specific content range, Y 2 O 3 The higher the content of (A), the lower the viscosity of the mold flux, and the higher the viscosity of ZrO 2 In cooperation, the heat flux density of the mold flux is reduced, that is, the heat insulating property of the mold flux is synergistically increased.
Example 11 increased Na over example 1 2 O and Li 2 0 content of Na in the mold flux 2 O and Li 2 0 is capable of destroying the network structure of the silicate inThe viscosity of the mold flux can be reduced within a specific content range.
Example 12 increased Na over example 1 2 O/Li 2 0, in a specific content range, na 2 The increase in O content increases the tendency to crystallize, and nepheline is likely to precipitate, which is not favorable for lubrication.
In comparison with example 1, examples 13 to 14 show that in the specified content range, caO/SiO 2 The ratio of (2) is increased, namely the alkalinity is increased, the crystallization is improved, and the heat transfer is reduced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. The covering slag for the continuous casting crystallizer is characterized by comprising the following components of SiO 2 24.00-31.00 parts of CaO26.00-33.00 parts of Al 2 O 3 5.40-5.70 parts of Fe 2 O 3 Not more than 3.00 parts of MgO not more than 3.00 parts of Na 2 O and Li 2 6.50-10.50 parts of O and CaF 2 3.50-7.50 parts of ZrO 2 4.5-5.5 parts of Y 2 O 3 3.5-4.5 parts;
the Na is 2 O and Li 2 The weight ratio of 0 is 1:1-2:1;
the CaO and SiO 2 In a weight ratio of 0.95:1-1.08:1.
2. A method for producing the mold flux for a continuous casting crystallizer claimed in claim 1, wherein: mixing SiO 2 24.00-31.00 parts of CaO26.00-33.00 parts of Al 2 O 3 5.40-5.70 parts of Fe 2 O 3 Not more than 3.00 parts of MgO not more than 3.00 parts of Na 2 O and Li 2 6.50 to 10.50 portions of O and CaF 2 3.50-7.50 parts of ZrO 2 4.5-5.5 parts of Y 2 O 3 3.5 to 4.5 portions of the powder slag of the finished product of the covering slag are obtained after uniform mixing and grinding.
3. The method for preparing the mold flux for the continuous casting mold as defined in claim 2, wherein: and drying the finished product of the covering slag powder slag.
4. The method for preparing the mold flux for the continuous casting mold according to claim 2, characterized in that: the milling process uses a ball mill.
5. The method for preparing the mold flux for the continuous casting mold as defined in claim 2, wherein: the particle size of the finished product of the covering slag powder is 100-200 meshes.
6. The method for preparing the mold flux for the continuous casting mold as defined in claim 2, wherein: and storing the finished product of the casting powder in a dry environment.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03193248A (en) * | 1989-12-25 | 1991-08-23 | Sumitomo Metal Ind Ltd | Mold powder for continuously casting steel |
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| KR100349151B1 (en) * | 1997-12-17 | 2003-02-07 | 주식회사 포스코 | Mold flux containing Zr02 for continous casting medium carbon steel |
| JP4337748B2 (en) * | 2005-03-14 | 2009-09-30 | 住友金属工業株式会社 | Mold powder for continuous casting of steel |
| EP2441541A4 (en) * | 2009-07-07 | 2017-03-15 | Nippon Steel & Sumitomo Metal Corporation | Mold flux for continuous casting of steel and method for continuous casting of steel using same |
| CN104607607B (en) * | 2014-12-31 | 2017-02-01 | 中南大学 | Fluoride-free mould flux for continuous casting of zirconium-containing medium-carbon steel |
| CN107498014B (en) * | 2017-09-06 | 2019-11-15 | 中南大学 | One kind containing ZrO2Automobile TWIP steel covering slag and its application |
| CN109095896A (en) * | 2018-08-21 | 2018-12-28 | 北京利尔高温材料股份有限公司 | A kind of ladle slag line brick of useless submersed nozzle slag line material pug |
| CN113084105A (en) * | 2021-03-31 | 2021-07-09 | 重庆大学 | Low-reactivity casting powder containing yttrium oxide for high-aluminum steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH03193248A (en) * | 1989-12-25 | 1991-08-23 | Sumitomo Metal Ind Ltd | Mold powder for continuously casting steel |
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