CN100494411C - Aluminium calcium strontium composite premelting slag for molten steel secondary-refining - Google Patents
Aluminium calcium strontium composite premelting slag for molten steel secondary-refining Download PDFInfo
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- CN100494411C CN100494411C CNB2006100540344A CN200610054034A CN100494411C CN 100494411 C CN100494411 C CN 100494411C CN B2006100540344 A CNB2006100540344 A CN B2006100540344A CN 200610054034 A CN200610054034 A CN 200610054034A CN 100494411 C CN100494411 C CN 100494411C
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- refining
- slag
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- cao
- steel
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Abstract
The disclosed Al-Ca-Sr composite pre-melt external refining sludge agent is obtained by breaking, mixing, and smelting with the bauxite, caustic-burned dolomite, fluorite, and limestone, and comprises: 28-42% CaO, 26-40% Al2O3, 4-10% SrO, 4-10% MgO, 3-9% CaF2 and 0<SiO2<6%. Wherein, it should control the mass ratio of CaO to Al2O3 within 0.7-1.3. This invention shows stronger desulfurization capacity than the Al-Ca sludge series, and fit to reduce impurity in liquid steel and convert the size-hold brittle inclusion into plastic impurity.
Description
Technical field
The present invention relates to molten steel furnace external refining refining slag agent, particularly a kind of aluminium calcium strontium composite premelting slag for molten steel secondary-refining belongs to steelmaking technical field.
Background technology
The molten steel furnace external refining technology is to improve steel quality, reduction steel inclusion and gas content effective means the most.Desulfurization and control oxygen content in steel are the important component parts of external refining, and using refining agent in the external refining process then is one of important measures.External refining commonly used has CaO-SiO with refining agent
2-Al
2O
3Refining agent, CaO-CaF
2(metal) is that refining agent, CaO-CaC are refining agent and CaO-Al
2O
3It is refining agent.As Chinese patent 200310111426.6 "-kind of steel-making refining agent ", disclose a kind of by SiO28～15%, Al
2O
325～33%, MgO 7～12%, and surplus is the external refining refining agent that CaO formed.CaO-Al
2O
3To be refining agent low owing to basicity height, fusing point, desulfurization and deoxidizing capacity are subjected to extensive concern by force.How further to improve CaO-Al
2O
3The affinability of refining agent makes it to be complementary with various external refining equipments and refining means, reaches various metallurgical requirement, just becomes CaO-Al
2O
3It is the key problem in technology that refining agent continues development.
Summary of the invention
The purpose of this invention is to provide a kind of CaO-Al of ratio
2O
3Slag system has higher desulfurization, deoxidation, absorption and is mingled with ability; Simultaneously, have uniform pre-arcing characterisitics, more low-melting CaO-Al
2O
3-SrO slag system is to improve desulfurization degree, to improve quality, the shortening refining time of molten steel and the aluminium calcium strontium composite premelting slag for molten steel secondary-refining of enhancing productivity.
Another object of the present invention provides the method for the described refining slag agent of preparation.
Purpose of the present invention realizes in the following manner: a kind of aluminium calcium strontium composite premelting slag for molten steel secondary-refining, by bauxitic clay, light dolomite, Wingdale, fluorite and the preparation of industrial Strontium carbonate powder; The chemical ingredients of this refining slag agent (weight %) satisfies: CaO 28-42%, Al
2O
326-40%, SrO 4-10%, MgO 4-10%, CaF
23-9% and 0＜SiO
2＜6%.
For guaranteeing that this refining slag agent has good pre-arcing characterisitics, CaO and Al in this refining agent
2O
3Quality ratio be controlled between 0.7-1.3.Wherein the chemical constitution of raw material satisfies respectively:
Aluminium vanadine: Al
2O
380-90%, 0＜Fe
2O
3＜1.5%, 0＜TiO2＜4.0%, 0＜SiO
2＜6.5%, 0＜S＜0.05%;
Light dolomite: MgO22-26%, CaO35-40%, 0＜SiO
24.0%, 0＜S＜0.05%;
Wingdale: CaO53-55%, 0＜SiO
2＜6.0%, 0＜S＜0.1%;
Fluorite: CaF
285-90%, 0＜SiO
2＜5.0%, 0＜S＜0.05%,
Strontium carbonate powder: SrCO
396%.
The preparation method of aluminium calcium strontium composite premelting slag for molten steel secondary-refining comprises following steps:
1) chemical ingredients of measurement starting material bauxitic clay, light dolomite, Wingdale, fluorite and industrial Strontium carbonate powder;
2) condition that satisfies according to refining slag agent chemical component weight %, i.e. CaO 28-42%, Al
2O
326-40%, SrO 4-10%, MgO 4-10%, CaF
23-9%, 0＜SiO
2＜6%, calculate required raw-material weight;
3) the above-mentioned starting material that take by weighing are in proportion melted evenly the back naturally cooling of coming out of the stove in the hot stove in ore deposit;
4) broken processing pack is stand-by.
Compared to existing technology, the present invention has following characteristics:
1) in the molten steel furnace external refining process, use this slag agent can improve desulfurization degree, improve steel quality, shorten refining time, enhance productivity;
2) refining slag agent of the present invention is mainly by CaO, Al
2O
3, SrO (MgO), CaF
2Form SiO
2Be not in the slag with addition of component, a spot of SiO of 6% that is no more than
2Only be that starting material are brought into; Thereby this refining slag agent has higher basicity;
3) CaO/Al in the refining slag agent of the present invention
2O
3Be controlled at about 1.0, in preprocessing process, can form in the refining slag agent with 12CaO7Al
2O
3Be main mineral composition, the temperature of fusion of refining slag agent can be controlled at below 1350 ℃; Simultaneously, under the steel-making temperature condition, this refining agent combines the (CaOAl that can form liquid state with sulfide inclusion in the steel
2O
3MnO) S is mingled with, thereby makes inclusion distribution spherical in shape, helps the eliminating of inclusion and improves the performance of steel;
4) contain 3-9% CaF in the refining slag agent of the present invention
2, under the temperature of external refining (1500 ℃), CaF
2With the acting in conjunction of other alkaline-earth metal (CaO, MgO, SrO), make the viscosity of this refining slag agent can be controlled at below the 1.0Pa.S;
5) contain in the refining slag agent of the present invention and be not more than 10% SrO, Sr
2+Ionic radius greater than Ca
2+, the optical basicity value is 1.1, SrO provides free O
+ 2Energy force rate CaO strong, thereby the alkalescence of SrO is stronger than CaO; Under the steel-making temperature condition, contain a certain amount of SrO in the slag and help desulfurization, improve the sweetening power of refining slag.
6) preparation method's technology of the present invention is simple, and is convenient feasible.
Embodiment
Embodiment 1:
At first, detect the composition of starting material bauxitic clay, light dolomite, Wingdale, fluorite and Strontium carbonate powder, the starting material that selection meets the following conditions, i.e. aluminium vanadine: Al
2O
380-90%, 0＜Fe
2O
3＜1.5%, 0＜TiO
2＜4.0%, 0＜SiO
2＜6.5%, 0＜S＜0.05%; Light dolomite: MgO22-26%, CaO35-40%, 0＜SiO
24.0%, 0＜S＜0.05%; Wingdale: CaO53-55%, 0＜SiO
2＜6.0%, 0＜S＜0.1%; Fluorite: CaF
285-90%, 0＜SiO
2＜5.0%, 0＜S＜0.05%; Strontium carbonate powder: SrCO
396%; Otherwise, should not use.
Then, according to the condition of refining slag thinner composition such as table 1, be not difficult to calculate required raw-material weight; Again the above-mentioned starting material that take by weighing are in proportion melted evenly the back naturally cooling of coming out of the stove in the hot stove in ore deposit; Broken processing pack is stand-by.
Chemical ingredients, the physicals of refining slag agent see Table 1, and corresponding composition of steel sees Table 2.
The original chemical ingredients (%) of table 1 refining slag and physicals (1550 ℃)
Experiment condition is: slag steel ratio is: 0.01, and 1550 ℃ of experimental temperatures are with corundum matter crucible splendid attire steel sample and refining agent.Experiment is carried out in the molybdenum disilicide High Temperature Furnaces Heating Apparatus, logical nitrogen protection.
Measure behind the desulfurization, sulphur content reduces to 0.009% by 0.051% in the steel, and desulfurization degree is 82.3%, and sulfur partition ratio is 113.
Embodiment 2:
Its method is identical with embodiment 1, and the starting material of refining slag agent also are bauxitic clay, light dolomite, Wingdale, fluorite and Strontium carbonate powder, and chemical ingredients, the physicals of refining slag agent see Table 3, and corresponding composition of steel sees Table 4.
The original chemical ingredients (%) of table 3 refining slag and physicals (1550 ℃)
The original chemical ingredients of the corresponding steel of table 4
Experiment condition is: slag steel ratio is: 0.01, and 1550 ℃ of experimental temperatures are with corundum matter crucible splendid attire steel sample and refining agent.Experiment is carried out in the molybdenum disilicide High Temperature Furnaces Heating Apparatus, logical nitrogen protection.
Measure behind the desulfurization, sulphur content reduces to 0.010% by 0.051% in the steel, and desulfurization degree is 81.37%, and sulfur partition ratio is 97.7.
Embodiment 3:
Its method is identical with embodiment 1, and the starting material of refining slag agent also are bauxitic clay, light dolomite, Wingdale, fluorite and Strontium carbonate powder, and after join slag, operations such as fritting were handled, chemical ingredients, the physicals of refining slag agent saw Table 5.Test sees Table 6 with corresponding steel grade and composition.
The original chemical ingredients (wt%) of table 5 refining slag and physicals (1550 ℃)
The corresponding test of the table 6 original chemical ingredients of steel
Test conditions is: test is carried out in 80 tons of LF ladle furnaces, ratio in steel weight 7% adds refining slag in the LF ladle furnace, refining temperature is 1620 ℃, and refining time 15 minutes is after refining treatment, sulphur content reduces to 0.008% by 0.026% in the steel, desulfurization degree reaches 69.2%, and total oxygen content is reduced to 57ppm by 237ppm, contrasts with the steel of handling without refining agent, under the steel-making temperature condition, steel inclusion is by solid-state (CaOAl
2O
3) the CaS sex change is liquid (CaOAl
2O
3) CaS, distributions spherical in shape in strand.
The present invention is at CaO-Al
2O
3On the basis of slag system, strict control CaO, Al
2O
3Ratio, make it between 0.7-1.3; Add the alkalescence SrO stronger than CaO, make slag system under the steel-making temperature condition, can discharge the more freedom alkaline-earth metal ions, improve the desulfurization and the affinability of slag system, the dystectic category-B of fragility is mingled with and combines the more low-melting sphere of formation (CaO (SrO) Al in slag system and the slag simultaneously
2O
3) be mingled with, make that brittle deformation does not take place inclusion in the rolling course of processing of strand, guarantee the stable and homogeneity of the internal soundness of steel.
1) experimental studies have found that, in slag system involved in the present invention, work as CaO/Al
2O
3When being 1 left and right sides, slag system at high temperature forms low melting point 12CaO7Al easily
2O
3, the temperature of fusion and the viscosity of slag system are lower, help the quick slagging of refining process and accelerate desulfurization rate.Thereby with the CaO/Al of slag system of the present invention
2O
3(wt%) be controlled in the scope of 0.7-1.3.
2) under SrO content is lower than 10% condition, the content that improves SrO can reduce slag system viscosity, improve sulfur partition ratio and absorb the speed of alumina inclusion, and its ability is better than CaO and MgO; SrO content is greater than after 10%, can cause forming the high-melting-point material in the slag and slag inhomogeneous, thereby require SrO content to be not more than 10% in the slag system of the present invention.
3) this refining agent can be prepared by following starting material, bauxitic clay, light dolomite, Wingdale, fluorite and Strontium carbonate powder.The chemical constitution of raw material is respectively, aluminium vanadine: Al
2O
380-90%, 0＜Fe
2O
3＜1.5%, 0＜TiO
2＜4.0%, 0＜SiO
2＜6.5%, 0＜S＜0.05%; Light dolomite: MgO22-26%, CaO35-40%, 0＜SiO
24.0%, 0＜S＜0.05%; Wingdale: CaO53-55%, 0＜SiO
2＜6.0%, 0＜S＜0.1%; Fluorite: CaF
285-90%, 0＜SiO
25.0%, 0＜S＜0.05%; Strontium carbonate powder: SrCO
396%.
4) refining agent can melt slagging rapidly in the external refining process in order to be implemented in, shorten refining time, reduce the temperature drop of refining process molten steel, refining agent of the present invention adopts following technique process refining: be mixed by the prescription weighing after the starting material fragmentation, fusing evenly in the hot stove in ore deposit, naturally cooling after coming out of the stove, broken again back is stand-by.
Claims (1)
1, a kind of aluminium calcium strontium composite premelting slag for molten steel secondary-refining, it is characterized in that, this refining agent is by bauxitic clay, light dolomite, Wingdale, fluorite and the preparation of industrial Strontium carbonate powder, and the weight % chemical ingredients of this refining slag agent is: CaO41.3%, Al
2O
333.91%, SrO 8.7%, MgO 4%, CaF
23% and 0＜SiO
2＜6%.
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|---|---|---|---|
| CNB2006100540344A CN100494411C (en) | 2006-01-16 | 2006-01-16 | Aluminium calcium strontium composite premelting slag for molten steel secondary-refining |
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|---|---|---|---|
| CNB2006100540344A CN100494411C (en) | 2006-01-16 | 2006-01-16 | Aluminium calcium strontium composite premelting slag for molten steel secondary-refining |
Publications (2)
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| CN1804052A CN1804052A (en) | 2006-07-19 |
| CN100494411C true CN100494411C (en) | 2009-06-03 |
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| CN101332497B (en) * | 2007-06-25 | 2010-05-19 | 宝山钢铁股份有限公司 | Continuous casting protection slag for high-alumina steel and manufacture method thereof |
| CN101649371B (en) * | 2009-08-26 | 2011-06-15 | 武汉科技大学 | Desulfurating agent for out-of-furnace treatment and preparation method thereof |
| CN108385035B (en) * | 2018-01-26 | 2020-06-16 | 兰州兰石集团有限公司 | Method for refining 14Cr1Mo alloy steel outside furnace by adopting premelted refining slag |
| CN111893241A (en) * | 2020-06-23 | 2020-11-06 | 辽宁科大托田炉料有限公司 | Pre-melted aluminum-magnesium-calcium synthetic slag and preparation method thereof |
| CN112011684A (en) * | 2020-08-25 | 2020-12-01 | 武汉钢铁有限公司 | Preparation method of iron-containing dust and mud pellets |
| CN113699404B (en) * | 2021-08-25 | 2022-06-24 | 苏州大学 | Composite salt for purifying aluminum waste and preparation and use methods thereof |
| CN115287464B (en) * | 2022-07-30 | 2023-04-28 | 宝钢轧辊科技有限责任公司 | Electroslag remelting method for preventing abnormal precipitation of carbide on surface layer of cold roll |
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2006
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Non-Patent Citations (2)
| Title |
|---|
| Al_2O_3-CaO基预熔精炼渣冶金物化性能的研究. 赵和明.重庆大学 硕士论文. 2003 * |
| 铝钙型预熔精炼渣熔化温度和粘度的研究. 赵和明，王新华，谢兵.钢铁钒钛，第25卷第2期. 2004 * |
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Granted publication date: 20090603 Termination date: 20120116 |