CN102787211A - Method for producing high-quality low-sulfur steel by using aluminium and calcium premelted refining slag - Google Patents
Method for producing high-quality low-sulfur steel by using aluminium and calcium premelted refining slag Download PDFInfo
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- CN102787211A CN102787211A CN2012102263623A CN201210226362A CN102787211A CN 102787211 A CN102787211 A CN 102787211A CN 2012102263623 A CN2012102263623 A CN 2012102263623A CN 201210226362 A CN201210226362 A CN 201210226362A CN 102787211 A CN102787211 A CN 102787211A
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Abstract
The invention puts forward a method for producing high-quality low-sulfur steel by using aluminium and calcium premelted refining slag, and the method can remove the sulfur in molten steel to be less than 0.0010 % and realize the goal of production of the high-quality low-sulfur steel. The method comprises using the aluminium and calcium premelted refining slag rich in calcium oxide and alumina during the producing process, the components range of the refining slag being 40 to 60 % CaO, 40 to 60 % of Al2O3, not more than 8 % of SiO2, and not more than 2 % of F<->, and the granularity being 5 to 35 mm; respectively adding one third of the refining slag before tapping, before refining and in the refining, with the adding amount being 5 to 10 kg / t steel; blowing argon gas from the bottom and stirring during the whole process of refining, with the stirring intensity not making the molten steel expose; and continuing to lightly blow the argon gas for the molten steel for 5 minutes after refining. The method is simple to operate and stable in desulphurization effect, and does not influence production rhythm. The refining slag used in the invention has characteristics of uniform components, low fluorine and low melting point due to a high-temperature melting processing during a manufacturing process thereof, and can realize quick slagging, achieve the goal of rapid desulphurization and reduce pollution to the environment.
Description
Technical field
The present invention relates to ferrous metallurgy steel-smelting production process technical field, relate in particular to external refining and use the method that the calcareous pre-molten refining slag of aluminium is produced the high-quality low-sulfur steel.
Background technology
Sulphur is harmful element (except the free-cutting steel) in most of steel grades, the ductility and the toughness that are mingled with meeting reduction steel of sulfide in the steel.Therefore, reduce sulphur content in the steel to the defective that reduces steel, improve steel mechanical property most important.So a lot of steel grades all require to fall sulphur content low more good more.Through literature search; " E.T.Turkdogan Fundamentals of Steelmaking " mentions Japanese monarch Tianjin V-KIP of Iron And Steel Plant (Vacuum-Kimizu Injeet Procass, i.e. vacuum-monarch Tianjin inject process LADLE REFINING PROCESS AND) and can sulphur be taken off to 0.0002%～0.0005%, in all refining units; It can be maximum that V-KIP stirs; Sweetening power is the strongest, and still, domestic do not have this kind equipment.Chinese patent 200610047101.X is a kind of deep desulfurizer and method of manufacture that is used for refining ultra-low-carbon steel, changes that to mention its sweetening effectiveness in the document better, but calculates through theoretic material balance, and its aluminium content is the oxide compound in the reduced steel slag inadequately at all.Therefore, can not accomplish dark desulfurization; And its sulfur removal technology is too complicated, and carry out reinforced the branch for 5～15 times, also will carry out temperature detection at every turn, and technological operation becomes difficult point, and repeatedly thermometric has also improved cost indirectly simultaneously.In addition, in this sweetening agent, also contain 1%～3% fluorite, at present, because it not only can influence the work-ing life of body of heater or molten steel jar lining refractories, but also can pollute environment, country has prohibited at steelmaking process and has used fluorite.Therefore, for the high-quality low-sulfur steel, need develop a kind of sweetening agent efficiently and a kind of effective sulfur removal technology or method urgently.
Be rich in the calcareous pre-molten refining slag of aluminium of aluminum oxide and quicklime, fusing point is low, and molten speed is fast; Sulfur capacity is high, forms stable performance through high-temperature fusion; Never degenerate, do not absorb water, not efflorescence, low fluorine; Molten steel is being carried out not only can promote molten steel desulfurizing in the refining process, refractory consumption rate is polluted, reduces in also favourable environmental protection, minimizing.Thereby it is very suitable for being used for producing the high-quality low-sulfur steel.
Summary of the invention
The objective of the invention is to prior art with the existing problem of invention and combine refining unit practical situation such as domestic LF; The method that is adapted at producing on the refining unit such as LF the high-quality low-sulfur steel more of exploitation; A kind of method that the calcareous pre-molten refining slag of aluminium is produced the high-quality low-sulfur steel of on LF refining units such as (Ladle Furnace ladle refining furnaces), using promptly is provided; Make under normal rhythm of production; Can the sulphur in the molten steel be taken off, reach the purpose of producing the high-quality low-sulfur steel to below 0.0010%.
In order to reach the foregoing invention purpose, technical scheme of the present invention is following,
The method that the calcareous pre-molten refining slag of this use aluminium is produced the high-quality low-sulfur steel is:
Use following refining slag in process of production, promptly adopt the calcareous pre-molten refining slag of aluminium that is rich in quicklime and aluminum oxide, its composition range is: CaO35～50%, Al
2O
335～50%, SiO
2≤8%, F
-≤2%, other content of impurities≤5%, granularity are 5～35mm;
The concrete add-on of refining slag and adding method: the add-on of the calcareous pre-molten refining slag of this aluminium is: 5～10kg/t steel; The adding method is to add in batches, promptly before the tapping, before the refining, respectively add 1/3rd in the refining;
(1) before the tapping: before the pushing off the slag tapping, add the calcareous pre-molten refining slag of 1/3rd these aluminium, the peroxo-steel is suitably added the metallic aluminium deoxidation, tapping back Argon stirs;
(2) before the refining: before refining furnaces such as LF carry out refining desulfuration to molten steel, in steel, add earlier the calcareous pre-molten refining slag of 1/3rd aluminium again;
(3) in the refining: when refining proceeds to 5～10 minutes, in steel, add the remaining calcareous pre-molten refining slag of 1/3rd aluminium more again;
Argon gas stirs: the omnidistance BOTTOM ARGON BLOWING at refining process stirs, and stirring intensity exposes as not make molten steel; After refining finishes, again molten steel is carried out 5 minutes weak Argon.
The calcareous pre-molten refining slag of wherein said aluminium is produced by following method,
The first step: prepare raw material, raw material comprises material that is rich in quicklime and the material that is rich in aluminum oxide;
Second step: the raw material of preparing in the first step is processed powder respectively;
The 3rd step: mix, the powder for preparing in second step is mixed by a certain percentage;
The 4th step: melting, the powder that mixes is added in the high temperature kiln, carry out melting for 1450～1600 ℃ in temperature;
The 5th step: come out of the stove post crystallization cooling of fusion;
The 6th step: broken moulding, through broken, process and be rich in CaO and Al
2O
3, granularity is the calcareous pre-molten refining slag of block lower melting point aluminium of 0～70mm.
Need should be mentioned that the material that the raw material in the first step in the production process of the calcareous pre-molten refining slag of aluminium is rich in quicklime comprises raw mineral materialss such as calcite, Wingdale, rhombspar and is rich in various trade wastes such as the carbide slag of quicklime, calcium lime powder, paper white sludge, calcium powder; The material that is rich in aluminum oxide comprises trade wastes such as the aluminium ash that is rich in aluminum oxide that produces in raw mineral materialss such as bauxitic clay and the Industrial processes, aluminium slag.Trade waste in the above-mentioned materials is its chief component, and mineral material is its less important integral part.
Further, the weight percentage ranges that is rich in the material of aluminum oxide in the raw material is 40%～60%; The weight percentage ranges that is rich in the material of quicklime is 40%～60%.
The weight percent of material that in the raw material that adopts, is rich in quicklime is about 40%, and the weight percent of material that is rich in aluminum oxide is when 60% left and right sides, and smelting temperature is controlled at 1450 ℃～1470 ℃, preferred 1450 ℃.
The weight percent of material that in the raw material that adopts, is rich in quicklime is about 60%, and the weight percent of material that is rich in aluminum oxide is when 40% left and right sides, and smelting temperature is controlled at 1580 ℃～1600 ℃, preferred 1600 ℃.
The material that in the raw material that adopts, is rich in quicklime is close with the weight percent of the material that is rich in aluminum oxide, promptly the two all when 50% left and right sides, smelting temperature is controlled at 1500 ℃～1540 ℃, preferred 1520 ℃.
The invention has the beneficial effects as follows: the method for using the calcareous pre-molten refining slag of aluminium on refining units such as LF, to produce the high-quality low-sulfur steel, simple to operate, sweetening effectiveness is stablized, and does not influence rhythm of production, can sulphur be taken off to below 0.0010%.Employed sweetening agent is the calcareous pre-molten refining slag of aluminium, in its manufacturing processed, has adopted the high-temperature fusion processing, has even, the low fluorine of composition, low-melting characteristics, can realize rapid slag, reaches the purpose of desulfurization rapidly, and has reduced the pollution to environment.
Embodiment
Below, specify the preferred embodiments of the present invention.Need to prove before this; Employed term or word can not limited interpretation be common implication or the implication in the dictionary in this specification sheets and claims, and should be based on being interpreted as implication and the notion that meets technological thought of the present invention for the principle that can suitably define the notion of term with its invention contriver of best mode explanation.Thereupon; The structure of representing among the embodiment that this specification sheets is put down in writing is one of most preferred embodiment of the present invention; Can not represent technological thought of the present invention fully, therefore should be understood that to have various equivalents and the variation that to replace for the present invention.
Table 1 is depicted as and on the LF refining unit, uses the implementation result that the calcareous pre-molten refining slag of iron is produced the high-quality low-sulfur steel, LF stove tonnage: 100t, and test number (TN): 6 times, refining effect: see table 1.
Table 1LF uses the implementation result that the calcareous pre-molten refining slag of iron is produced the high-quality low-sulfur steel
The concrete composition of the calcareous pre-molten refining slag of the iron that uses in the foregoing description is seen table 2.
The concrete composition % of the calcareous pre-molten refining slag of iron that table 2LF uses
| Component | Al 2O 3 | CaO | SiO 2 | MgO | Fe 2O 3 | P | S | F | TiO 2 |
| Content % | 45～50 | 40～45 | ≤4.0 | ?≤4.0 | ≤2.5 | ≤0.08 | ≤0.15 | ?≤0.15 | ≤0.80 |
The calcareous pre-molten refining slag of iron granularity is 5～35mm in the table.
Practical application effect through the above table demonstration; Can find out; In secondary refinings such as LF, the method that adopts the calcareous pre-molten refining slag of application aluminium of the present invention to produce the high-quality low-sulfur steel, simple to operate, sweetening effectiveness is stablized; Do not influence rhythm of production, and can sulphur be taken off to below 0.0010%.
Describe and illustrate with reference to embodiment although it should be noted that the present invention, and in embodiment, provided the step of the method for using the calcareous pre-molten refining slag production of aluminium high-quality low-sulfur steel.But and do not mean that the present invention is limited to the embodiment of these descriptions.Those skilled in the art can therefrom derive many different variants, and they all will be covered in the true spirit and scope of claim of the present invention.
Claims (8)
1. method of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel is characterized in that:
Use following refining slag in process of production, promptly adopt the calcareous pre-molten refining slag of aluminium that is rich in quicklime and aluminum oxide, its composition range is: CaO35～50%, Al
2O
335～50%, SiO
2≤8%, F
-≤2%, other content of impurities≤5%, granularity are 5～35mm;
The concrete add-on of refining slag and adding method: the add-on of the calcareous pre-molten refining slag of this aluminium is: 5～10kg/t steel; The adding method is to add in batches, promptly before the tapping, before the refining, respectively add 1/3rd in the refining;
(1) before the tapping: before the pushing off the slag tapping, add the calcareous pre-molten refining slag of 1/3rd these aluminium, the peroxo-steel is suitably added the metallic aluminium deoxidation, tapping back Argon stirs;
(2) before the refining: before refining furnaces such as LF carry out refining desulfuration to molten steel, in steel, add earlier the calcareous pre-molten refining slag of 1/3rd aluminium again;
(3) in the refining: when refining proceeds to 5～10 minutes, in steel, add the remaining calcareous pre-molten refining slag of 1/3rd aluminium more again;
Argon gas stirs: the omnidistance BOTTOM ARGON BLOWING at refining process stirs, and stirring intensity exposes as not make molten steel; After refining finishes, again molten steel is carried out 5 minutes weak Argon.
2. a kind of method of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel according to claim 1, it is characterized in that: the calcareous pre-molten refining slag of described aluminium is produced by following method,
The first step: prepare raw material, raw material comprises material that is rich in quicklime and the material that is rich in aluminum oxide;
Second step: the raw material of preparing in the first step is processed powder respectively;
The 3rd step: mix, the powder for preparing in second step is mixed by a certain percentage;
The 4th step: melting, the powder that mixes is added in the high temperature kiln, carry out melting for 1450～1600 ℃ in temperature;
The 5th step: come out of the stove post crystallization cooling of fusion;
The 6th step: broken moulding, through broken, process and be rich in CaO and Al
2O
3, granularity is the calcareous pre-molten refining slag of block lower melting point aluminium of 0～70mm.
3. a kind of method of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel according to claim 2; It is characterized in that: the material that the raw material in the first step in the production process of the calcareous pre-molten refining slag of aluminium is rich in quicklime comprises raw mineral materialss such as calcite, Wingdale, rhombspar and is rich in various trade wastes such as the carbide slag of quicklime, calcium lime powder, paper white sludge, calcium powder that wherein trade waste is a chief component.
4. a kind of method of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel according to claim 2; It is characterized in that: the material that the raw material in the first step in the production process of the calcareous pre-molten refining slag of aluminium is rich in aluminum oxide comprises trade wastes such as the aluminium ash that is rich in aluminum oxide that produces in raw mineral materialss such as bauxitic clay and the Industrial processes, aluminium slag, and wherein trade waste is a chief component.
5. according to claim 3 or 4 described a kind of methods of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel, it is characterized in that: the weight percentage ranges that the raw material in the first step is rich in the material of aluminum oxide is 40%～60%; The weight percentage ranges that is rich in the material of quicklime is 40%～60%.
6. a kind of method of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel according to claim 5; It is characterized in that: the weight percent of material that in the raw material that adopts, is rich in quicklime is about 40%; The weight percent of material that is rich in aluminum oxide is when 60% left and right sides; Smelting temperature is controlled at 1450 ℃～1470 ℃, preferred 1450 ℃.
7. a kind of method of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel according to claim 5; It is characterized in that: the weight percent of material that in the raw material that adopts, is rich in quicklime is about 60%; The weight percent of material that is rich in aluminum oxide is when 40% left and right sides; Smelting temperature is controlled at 1580 ℃～1600 ℃, preferred 1600 ℃.
8. a kind of method of using the calcareous pre-molten refining slag of aluminium to produce the high-quality low-sulfur steel according to claim 5; It is characterized in that: the material that in the raw material that adopts, is rich in quicklime is close with the weight percent of the material that is rich in aluminum oxide; Be that the two is all when 50% left and right sides; Smelting temperature is controlled at 1500 ℃～1540 ℃, preferred 1520 ℃.
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| CN109576442A (en) * | 2018-12-29 | 2019-04-05 | 西峡县耀辉冶金材料有限公司 | A kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method |
| CN109628694A (en) * | 2018-12-29 | 2019-04-16 | 西峡县耀辉冶金材料有限公司 | A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method |
| CN109971920A (en) * | 2019-05-20 | 2019-07-05 | 刘持强 | The method for preparing pre-melted type refining agent using Industrial Solid aluminium scrap ash |
| CN110106312A (en) * | 2019-03-19 | 2019-08-09 | 新疆中合大正冶金科技有限公司 | A kind of technique using electrolytic aluminium carbon slag production LF slagging agent |
| CN111485063A (en) * | 2020-06-06 | 2020-08-04 | 内蒙古铧钰环保材料有限公司 | High-efficiency utilization process of aluminum ash in electrolytic aluminum plant |
| CN111996336A (en) * | 2020-08-30 | 2020-11-27 | 中南大学 | Refining method for smelting low-sulfur steel with high efficiency and low cost |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109576442A (en) * | 2018-12-29 | 2019-04-05 | 西峡县耀辉冶金材料有限公司 | A kind of ultralow boron molten steel refining agent of ultralow nitrogen and preparation method |
| CN109628694A (en) * | 2018-12-29 | 2019-04-16 | 西峡县耀辉冶金材料有限公司 | A kind of ultralow nitrogen ultralow titanium molten steel refining agent and preparation method |
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| CN111485063A (en) * | 2020-06-06 | 2020-08-04 | 内蒙古铧钰环保材料有限公司 | High-efficiency utilization process of aluminum ash in electrolytic aluminum plant |
| CN111996336A (en) * | 2020-08-30 | 2020-11-27 | 中南大学 | Refining method for smelting low-sulfur steel with high efficiency and low cost |
| CN111996336B (en) * | 2020-08-30 | 2022-04-15 | 中南大学 | Refining method for smelting low-sulfur steel with high efficiency and low cost |
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Application publication date: 20121121 |