CN1911558A - Molten steel covering agent and its preparation method - Google Patents
Molten steel covering agent and its preparation method Download PDFInfo
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- CN1911558A CN1911558A CNA200610095064XA CN200610095064A CN1911558A CN 1911558 A CN1911558 A CN 1911558A CN A200610095064X A CNA200610095064X A CN A200610095064XA CN 200610095064 A CN200610095064 A CN 200610095064A CN 1911558 A CN1911558 A CN 1911558A
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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
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Abstract
The present invention is molten steel covering agent and its preparation process. The molten steel covering agent consists of Na2O 1-8 wt%, F- 0-7 wt%, Al2O3 3-40 wt%, CaO 5-40 wt%, Fe2O3 0-2 wt%, foaming agent 0.5-10 wt%, adhesive 1-20 wt% except MgO and SiO2, where the weight ratio (CaO+MgO)/SiO2 is 2-10. The molten steel covering agent is porous grains of grain size 0.1-15 mm. Its preparation process includes the following steps: mixing foaming agent, adhesive and water in a stirring vessel to prepare liquid; mixing the liquid and other components through mechanical stirring to form slurry; forming, drying, crushing and sieving. The molten steel covering agent is used in covering molten steel in ladle and possesses the metallurgical functions of maintaining heat, absorbing impurity, avoiding carburization of molten steel, etc.
Description
Technical field
The present invention relates to the coverture that molten steel surface added in ladle and tundish.
Background technology
Molten steel to the conticaster transport process, will pass through a series of metallurgical reactions from converter in ladle and tundish, for realizing different metallurgical functions, often need to use the agent of corresponding reaction slag.For example, in order to improve molten steel cleanness (as reducing [S], [P] and inclusion content), often in ladle, add refining slag; When adopting electric arc heated (LF stove) in ladle, use foamed slag to reduce the radiation of electric arc to cylinder-packing and clad, the major function of all these slag agent is to strengthen refining process.And, then must add coverture at ladle and tundish molten steel surface with heat insulation function for the serious temperature drop that prevents in molten steel transport process and the casting cycle.Therefore, insulation---be the basic functions of molten steel covering agent.By the insulation effect of coverture, reduce the thermal loss in the molten steel transport process, reduce tapping temperature, extending furnace lining life reduces temperature fluctuation, guarantees the smooth and easy of the normal linking rhythm of steel-making and continuous casting and sequence casting flow process.
Except that heat insulation function, molten steel covering agent also should play the effect that prevents secondary oxidation of steel, absorbs come-up field trash in the molten steel, and does not pollute molten steel and steel mill production environment.The coverture of using in the tundish, except that satisfying above-mentioned requirements, also tackle a little less than stopper, the cylinder-packing corrosion function, avoid slag lining to corrode serious and shorten to connect and water the stove number, has good operability, add fashionable on the molten steel face, sprawling and cover well, be difficult for crust in the casting process, be convenient to clear up and do not influence after cast finishes do not separate package operation.
For realizing the above-mentioned metallurgical function of molten steel covering agent, people are mainly carrying out following research aspect coverture composition and the production technology:
(1) use is made heat preserving agent for liquid steel through the paddy rice of carbonization treatment or the fruit grain involucrum (being referred to as carbonization rice husk) of crops such as corn or wheat.Crops fruit grain involucrum wide material sources, cheap, under the condition of secluding air, it is carried out high temperature distillation and handle, with water and the evaporation of hydrogeneous organic matter wherein, can obtain the carbon content carbonization rice husk of (weight %) 40～60 approximately, the little (about 0.3～0.5g/cm of its bulk density
3), it directly is added on the molten steel face, can play good insulation effect to molten steel.But use carbonization rice husk many shortcomings to be arranged as coverture, as: a large amount of smoke pollution air that produce in the carbonization rice husk production process; Carbonization rice husk does not melt on the molten steel face, can't form liquid slag layer, does not possess the metallurgical function that absorbs come-up field trash in the molten steel, can not cut off the secondary oxidation of air to molten steel; Carbonization rice husk phosphorus content height contacts easily to mild steel and ultra-low-carbon steel carburetting with molten steel; Use carbonization rice husk easily to produce when unpacking and fly upward dust, because its phosphorus content height, electric conductivity is strong, often causes the driving cable short circuit, burns relevant facility, and flies upward the cleaning running that dust is unfavorable for factory.Therefore, carbonization rice husk can't satisfy the demand of the modernized steel-smelting production process that variety and quality improves constantly.
(2) adopt carbonaceous material such as carbonization rice husk, coke and the combined mode of covering slag to realize covering function to molten steel.Usually, with addition of the covering slag of certain content carbonaceous material, fusing back forms melt cinder on the molten steel face, can absorb the field trash that floats in the molten steel, but liquid covering slag also secluding air to the secondary oxidation of molten steel; Carbonization rice husk or coke grain are positioned at above the covering slag, can reduce top of the slag heat radiation, molten steel are played the effect of insulation.This coverture mode can satisfy the demand of most of middle and high carbon steels substantially, but the pollution problem that is caused by the carbonization rice husk dust from flying is not resolved yet, and carbonaceous material is still easily to mild steel and ultra-low-carbon steel carburetting in this coverture.
(3) adopt Powdered carbon-free covering agent, can eliminate the harm of coverture to mild steel and ultra-low-carbon steel carburetting, for guaranteeing the heat insulation function of coverture, add the bulk density that light materials such as vermiculite, perlite reduce coverture usually, or above-mentioned light material is added in the coverture surface.This kind pattern is fully played the metallurgical function of coverture.But because of coverture is Powdered, in the interpolation process, easily produce dust, still be unfavorable for the production that cleans of factory.
(4) for reducing the pollution of dust, adopt methods such as rotation, vibration, atomizing that coverture is made particle,, produce hollow bead with atomizing dry tower as make full particle with granulating disc.The neutrality or the acid particles coverture result of use that wherein contain carbonaceous material are better, but along with absorption being mingled with improving constantly of functional requirement, acid coverture is eliminated gradually, needs to use alkaline covering agent in the production.And alkaline covering agent, particularly do not contain carbonaceous material the easy sintering of alkaline covering agent and on the molten steel face incrustation, duricrust remains in and makes the ladle residue be difficult for being cleaned out and changing in next Baogang's water in the ladle, duricrust is involved in molten steel and enters crystallizer with beam at tundish Nei Zeyi, directly forms strand and is mingled with.Therefore, not only can not realize the metallurgical function of expecting worsening the danger of steel on the contrary in addition with the alkaline carbon-free covering agent of above-mentioned explained hereafter.
Summary of the invention
First purpose of the present invention is, provide a kind of can be to mild steel and ultra-low-carbon steel carburetting, can not bring adverse effect to the metallurgical function of molten steel expection;
Second purpose of the present invention is that a kind of method for preparing above-mentioned molten steel covering agent is provided.
For reaching first goal of the invention, provide a kind of like this molten steel covering agent.The component of this coverture (weight %) is: 1～8 Na
2O, 0～7 F
-, 3～40 Al
2O
3, 5～40 CaO, 0～2 Fe
2O
3, 0.5～10 blowing agent, 1～20 binding agent and be the MgO and the SiO of surplus
2Wherein, (CaO+MgO)/SiO
2Be 2～10.
Further feature is, coverture of the present invention is a porous particle, and its granularity is 0.1～15mm.
For reaching second goal of the invention, 1. the method for preparing above-mentioned molten steel covering agent comprises the steps: that in stirred tank blowing agent and binding agent are added water to be stirred and make liquid, 2. adopt the mechanical agitation mode that other component of this liquid and described coverture stirring and evenly mixing is together made slip, 3. this slip shaping → drying → fragmentation → screening.
Compared with prior art, superiority of the present invention is as follows:
Because coverture phosphorus content of the present invention few (have in calcium carbide, the syrup negligible a little), therefore, to mild steel with ultra-low-carbon steel does not just have unnecessary or to expecting that metallurgical function brings the carburetting consequence of adverse effect; Again owing in coverture of the present invention, added proper addition of MgO, decapacitation and CaO and SiO
2Make this coverture be alkalescence together and regulate outside its basicity, this MgO weakens the cementation of coverture and cylinder-packing, stopper in addition, helps ladle scarfing cinder and tundish and separates package operation.Therefore, the present invention has eliminated the danger that worsens steel again in the advantage that keeps alkaline covering agent.
From further feature, can also see, because coverture of the present invention is porous particle and certain particle is arranged but not some is of the prior art Powdered, therefore, in the interpolation process, can not produce dust pollution, help the production that cleans of factory.
Obviously, prepare the method for molten steel covering agent of the present invention, not only can guarantee to produce this granular molten steel covering agent, and manufacturing process is simple.Also promptly this method can be guaranteed the realization of this molten steel covering agent, can be saved preparation cost again.
The present invention is further illustrated below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is in the sequence casting process, melt cinder fusion temperature in the tundish (comparison diagram of embodiment 1 and comparative example 1)
Fig. 2 is in the sequence casting process, liquid steel temperature situation of change figure in the tundish
The specific embodiment
A kind of molten steel covering agent.The component of this coverture (weight %) is: 1～8 Na
2O, 0～7 F
-, 3～40 Al
2O
3, 5～40 CaO, 0～2 Fe
2O
3, 0.5～10 blowing agent, 1～20 binding agent and be the MgO and the SiO of surplus
2Wherein, (CaO+MgO)/SiO
2Be 2～10.
Further, this molten steel covering agent is a porous particle, and its granularity is 0.1～15mm.
A kind of method for preparing above-mentioned molten steel covering agent.This method comprises the steps: weigh batching → produce mother liquor → slurrying → shaping → drying → fragmentation → screening.That is:
(1) according to the various material of coverture proportioning weighing;
(2) blowing agent that will be wherein and binding agent add and add water in the stirred tank and stir and obtain mixing material (mother liquor);
(3) mix and adopt mechanical agitation mode mixing to obtain compound other coverture component except that blowing agent and binding agent;
(4) add above-mentioned mother liquor in the compound and stirring and evenly mixing makes slip;
(5) slip is injected solidified forming in the mould;
(6) after the baking of the slip after will the solidifying drying, again through broken and screening, getting granularity is that 0.1～15mm is partly for the finished product coverture---remainder returns pulping process.
In molten steel covering agent of the present invention, CaO, MgO, SiO
2Be base-material, by they [(CaO+MgO)/SiO
2] ratio control the basicity of this coverture, its purpose remains and makes it be alkalescence, is beneficial to absorb the field trash that floats in the molten steel, purify hot metal, and reduce etch to alkaline cylinder-packing.Wherein, the cementation that weakens coverture and cylinder-packing, stopper is played in the adding of MgO, helps ladle scarfing cinder and tundish and separates package operation.
Al in coverture of the present invention
2O
3, be formed with the eutectic that is beneficial to absorption oxide and sulphide inculsion with compositions such as CaO, MgO, improve the function of coverture purify hot metal.When the molten steel that covers is aluminum killed steel, Al in ladle covering agent
2O
3Contain and measure the middle upper limit; For in the tundish and non-aluminum killed steel ladle in molten steel, Al in the coverture
2O
3Contain and measure lower limit.
In coverture of the present invention, Fe
2O
3(weight %) 0～2 mainly brought into by raw material, lower Fe in the control coverture
2O
3Content can strengthen the effect that coverture prevents secondary oxidation of steel.
In coverture of the present invention, Na
2O is used for and CaO, MgO and SiO
2The fusion temperature of acting in conjunction control coverture is 1300～1500 ℃, guarantee that coverture forms liquid slag layer on the molten steel face, contact with the molten steel face with air-isolation, prevent secondary oxidation of steel, and the non-metallic inclusion by floating in liquid slag layer absorption and the assimilation molten steel.Because Na
2O self fusing point (920 ℃) is lower, in coverture with CaO, MgO and SiO
2Can form low melting point eutectic, thereby reduce the fusion temperature of coverture, when the steel grade liquidus temperature is lower, or when alloying element content was higher in the steel, the coverture fusion temperature was got lower limit in above-mentioned scope, Na
2O content is value between the middle limit of the present invention regulation and the upper limit, on the contrary Na
2O content is value between the middle limit of the present invention regulation and lower limit.
In coverture of the present invention, F
-Be used to regulate the viscosity of coverture melt cinder, make it have good mobility.Because F
-Interrupt complicated anion radical structure by replacing the bridging oxygen position, make slag micro unit size decreases be easy to migration, reduce coverture melt cinder viscosity thus.As basicity (CaO+MgO)/SiO
2≤ 3, F in the coverture
-Content can be between the middle limit of the present invention regulation and the upper limit value; As (CaO+MgO)/SiO
2＞3, F in the coverture
-Content can be between the middle limit of the present invention regulation and lower limit value, even content is 0, promptly obtains floride-free coverture, is very beneficial for reducing the pollution of steel mill fluorine to environment.
In coverture of the present invention, the blowing agent purpose is to increase coverture hollow core hole by blowing agent, reduces the bulk density of coverture thus, improves the adiabatic heat-insulation action effect of coverture to molten steel.In this specific embodiment, its blowing agent is any one or any two sum in sodium abietate, calcium carbide, silico-calcium, aluminium, the syrup; And when blowing agent was two kinds of materials, the volume fraction of each material equated.The basic principle that blowing agent plays foaming effect is: blowing agent produces gas in forming liquid process, as shown in the formula:
The gas that reaction is produced is dispersed in the coverture slip with the form of many minute bubbles, slip is expanded, after slip is shaped, its profile is cured, bubble position then stays hollow hole, and the slip after the shaping promptly becomes the coverture with many micropores by further dry.Because the effect of a large amount of micropores, although CaO, MgO, SiO
2Deng composition than great, but through the foaming after the little (0.4～0.7g/cm of coverture bulk density
3), certain condition descends the bulk density (0.3～0.5g/cm with carbonization rice husk
3) quite, therefore, this foaming coverture has good insulation capacity.
In coverture of the present invention, binding agent is to promote each powder composition of coverture to be combined into the material with certain intensity particle.This binding agent is any one or any two sum or wantonly three kinds of sums in waterglass, starch, cellulose, the syrup; And when binding agent was made up of two or more material, the volume fraction of each material equated.
In view of those skilled in the art is doing a large amount of work aspect the research of molten steel covering agent and preparation method thereof, aspect theory and practice, all accumulate a large amount of, rich experience.Therefore, after conscientiously having read this specific embodiment and corresponding analysis the thereof, one surely according to other actual conditions, in the scope of component that the present invention proposes and corresponding proportion thereof, (doing the test of limited several times routine at the most again) select one group of coverture prescription that satisfies other conditions particularly, realizing the present invention, and reach technique effect of the present invention.So, below only enumerate the checking embodiment of two the bests.
A checking embodiment adds coverture in the tundish, and another checking embodiment adds coverture in the ladle comparative example 1, comparative example 2, comparative example 3 existing three kinds of covertures.
Embodiment 1:
In being 30 tons tundish, capacity carried out molten steel covering agent of the present invention and comparative example 1, comparative example 2 compare checking.The casting carbon content is smaller or equal to the ultra-low-carbon steel of 50ppm, and the tundish liner uses MgO matter coating, and the stopper material is MgO-Cr
2O
3Matter, the chemical composition and the performance of each coverture see Table 1.The preparation technology of each coverture is:
The preparation technology of embodiment 1 coverture is: carbon-free alkalescence foaming molten steel covering agent preparation technology of the present invention, that is: weigh batching → produce mother liquor → slurrying → shaping → drying → fragmentation → screening → test package and use.
The preparation technology of comparative example 1 coverture is: weigh batching → mix → drying → test package and use, this coverture are Powdered.
The preparation technology of comparative example 2 covertures is: weigh batching → slurrying → mist projection granulating → drying → screening → test package and use.
Present embodiment molten steel covering agent consumption is the 0.25Kg/T steel, unwraps when watering in the middle of first stove, and 2/3 of total addition is added on the tundish molten steel face, adds 1/3 of remainder after the 4th stove is opened and watered again.This coverture melts the formation liquid slag layer rapidly with the molten steel contact portion after adding tundish, gets the melt cinder sample and test its fusion temperature in the sequence casting process, (see figure 1) between basicly stable 1195～1250 ℃; Except that liquid slag layer, the part that contacts with atmosphere is a not crucible zone of solid shape, and the phenomenon of coverture bonding cylinder-packing and stopper does not appear in no sintering caking, conglomeration, crust phenomenon; Molten steel temperature in tundish is stable, satisfies continuous casting process control target call (see figure 2); Because of this coverture does not contain carbonaceous material substantially, molten steel there is not carburetting harm; Casting finishes the back and checks cylinder-packing and stopper slag lining, does not almost have erosion, and it is easy to unpack, and turns over that residue comes off voluntarily in the packet procedures.
Comparative example 1 coverture consumption is the 0.3Kg/T steel, and the adding method is identical with embodiment 1 coverture with the joining day.The part that this coverture contacts with molten steel is a liquid slag layer, and the part that contacts with atmosphere is a not crucible zone of solid shape, no sintering caking, conglomeration, crust phenomenon; But prolong with casting time, connect and water the stove number and increase, the melt cinder fusion temperature (see figure 1) that constantly raises is unfavorable for absorbing the field trash that floats in the molten steel; Because carbon content height in this coverture causes molten steel recarburization 10～20ppm; Casting finishes the back and checks cylinder-packing and stopper slag lining, corrodes serious; When unpacking, dust from flying is serious.
Comparative example 2 coverture consumptions are the 0.35Kg/T steel, and the adding method is identical with embodiment 1 coverture with the joining day.Because this coverture fusion temperature height, just begin to occur melt cinder up to the 3rd stove, a large amount of sintering group, piece have appearred in the coverture during to the 4th stove, skull is suspended on cylinder-packing wall and the stopper when middle Baogang liquid level descends, skull is submerged in the molten steel when molten steel face rising rear section, and causing molten steel to be mingled with slag inclusion increases.
Embodiment 2:
In being 50 tons ladle, capacity carried out molten steel covering agent of the present invention and comparative example 3 compares checking (component and performance see Table 1).
Carbon content of molten steel is (weight %) 0.02～0.06.The preparation technology of embodiment 2 covertures is identical with the preparation technology of embodiment 1 coverture, and the preparation technology of comparative example 3 covertures is identical with the preparation technology of comparative example 2 covertures.Each coverture consumption is the 0.15Kg/T steel, after liquid steel refining finishes, and disposable respectively being added on the ladle molten steel face.Use embodiment 2 coverture molten steel not have the carburetting phenomenon, use comparative example 3 coverture carbon content of molten steel to increase (weight %) 0.015.
Table 1
| Embodiment 1 | Comparative example 1 | Comparative example 2 | Embodiment 2 | Comparative example 3 | |
| CaO (weight %) | 18.60 | 29.64 | 5.52 | 37.25 | 36.51 |
| SiO 2(weight %) | 15.26 | 37.44 | 14.36 | 13.74 | 14.84 |
| MgO (weight %) | Surplus | Surplus | Surplus | Surplus | Surplus |
| (CaO+MgO)/SiO 2 | 5.04 | 0.94 | 5.49 | 3.91 | 3.04 |
| Al 2O 3(weight %) | 3.10 | 3.85 | 3.52 | 27.61 | 23.07 |
| Fe 2O 3(weight %) | 1.65 | 2.31 | 1.87 | 0.65 | 1.97 |
| Na 2O (weight %) | 3.58 | 4.87 | 1.48 | 2.86 | 2.19 |
| F -(weight %) | 3.62 | 1.35 | 2.34 | ||
| C (weight %) | 12.65 | 10.43 | |||
| Fusion temperature, ℃ | 1370 | 1225 | 1600 | 1460 | 1420 |
| Bulk density, g/cm 3 | 0.47 | 0.73 | 0.78 | 0.54 | 0.76 |
| Use station | Tundish | Tundish | Tundish | Ladle | Ladle |
Claims (6)
1, a kind of molten steel covering agent is characterized in that, the component of this coverture (weight %) is: 1～8 Na
2O, 0～7 F
-, 3～40 Al
2O
3, 5～40 CaO, 0～2 Fe
2O
3, 0.5～10 blowing agent, 1～20 binding agent and be the MgO and the SiO of surplus
2Wherein, (CaO+MgO)/SiO
2Be 2～10.
2, molten steel covering agent according to claim 1 is characterized in that: described blowing agent is any one or any two sum in sodium abietate, calcium carbide, silico-calcium, aluminium, the syrup; When blowing agent was two kinds of materials, the volume fraction of each material equated.
3, according to the molten steel covering agent described in claim 1 or 2, it is characterized in that: described binding agent is any one or any two it or wantonly three kinds of sums in waterglass, starch, cellulose, the syrup; When binding agent was made up of two or more material, the volume fraction of each material equated.
4, according to the molten steel covering agent described in claim 1 or 2, it is characterized in that this coverture is a porous particle, its granularity is 0.1～15mm.
5, according to the molten steel covering agent described in the claim 3, it is characterized in that this coverture is a porous particle, its granularity is 0.1～15mm.
6, a kind of method for preparing described molten steel covering agent, it is characterized in that 1. this method comprises the steps: that in stirred tank blowing agent and binding agent are added water to be stirred and make liquid, 2. adopt the mechanical agitation mode that other component of this liquid and described coverture stirring and evenly mixing is together made slip, 3. this slip shaping → drying → fragmentation → screening.
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|---|---|---|---|
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610095064XA CN100371105C (en) | 2006-08-25 | 2006-08-25 | Molten steel covering agent and its preparation method |
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| Publication Number | Publication Date |
|---|---|
| CN1911558A true CN1911558A (en) | 2007-02-14 |
| CN100371105C CN100371105C (en) | 2008-02-27 |
Family
ID=37720704
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| CN106623880B (en) * | 2016-12-13 | 2018-06-15 | 武汉钢铁有限公司 | Remove the slagging agent and sweep-out method of ladle dry slag |
| CN111850236A (en) * | 2020-07-23 | 2020-10-30 | 芜湖县天海耐火炉料有限公司 | Covering agent for steelmaking and preparation method thereof |
| CN112662840A (en) * | 2021-01-08 | 2021-04-16 | 荆门市嘉恩冶金材料有限公司 | Light environment-friendly covering agent and preparation method thereof |
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| CN100371105C (en) | 2008-02-27 |
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