CN100564548C - High-alkalinity refining slag for slag washing of converter steelmaking - Google Patents
High-alkalinity refining slag for slag washing of converter steelmaking Download PDFInfo
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- CN100564548C CN100564548C CNB2007102019905A CN200710201990A CN100564548C CN 100564548 C CN100564548 C CN 100564548C CN B2007102019905 A CNB2007102019905 A CN B2007102019905A CN 200710201990 A CN200710201990 A CN 200710201990A CN 100564548 C CN100564548 C CN 100564548C
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- 239000002893 slag Substances 0.000 title claims abstract description 101
- 238000007670 refining Methods 0.000 title claims abstract description 66
- 238000009628 steelmaking Methods 0.000 title claims abstract description 23
- 238000005406 washing Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 23
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 18
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 18
- 239000004571 lime Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 14
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 11
- 239000010436 fluorite Substances 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims abstract description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 10
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 10
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 8
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 22
- 239000002994 raw material Substances 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 14
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 10
- 239000004615 ingredient Substances 0.000 claims description 7
- 238000013467 fragmentation Methods 0.000 claims description 6
- 238000006062 fragmentation reaction Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 5
- 230000004927 fusion Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims 2
- 238000010079 rubber tapping Methods 0.000 abstract description 20
- 238000006477 desulfuration reaction Methods 0.000 abstract description 14
- 230000023556 desulfurization Effects 0.000 abstract description 11
- 238000002844 melting Methods 0.000 abstract description 3
- 230000008018 melting Effects 0.000 abstract description 3
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 229910001634 calcium fluoride Inorganic materials 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
- 229910000029 sodium carbonate Inorganic materials 0.000 abstract 1
- 235000017550 sodium carbonate Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 37
- 239000010959 steel Substances 0.000 description 37
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 16
- 238000003723 Smelting Methods 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000005266 casting Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 239000005864 Sulphur Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to a high-alkalinity refining slag for slag washing of converter steelmaking and a preparation method thereof, the refining slag is prepared by uniformly mixing active lime, fluorite and industrial soda ash in a disc mixer, and the refining slag comprises the following chemical components in percentage by weight: CaO is more than or equal to 70.0 percent and less than or equal to 88 percent, and SiO is more than 0 percent2≤3.0%、0＜Al2O3≤4.5%、2.0%≤Na2O≤4.1%、8.0%≤CaF213.3 percent or less, MgO more than 0 and 5.2 percent or less, and the balance of ignition reducing components, P, S and the likeTrace impurities of binary basicity CaO/SiO2Not less than 23.3. When the high-alkalinity refining slag is applied to slag washing in the converter tapping process, the melting is fast, the splashing is avoided, the desulfurization efficiency is high and stable, and the requirements of refining deoxidation and removing nonmetallic inclusion can be met.
Description
Technical field
The present invention relates to a kind of high basicity refining slag, particularly a kind of high-basicity refining slag for slag washing of revolving furnace steel-making and preparation method thereof belongs to technical field of ferrous metallurgy.
Background technology
Along with The development in society and economy, the user is more and more higher to the specification of quality of steel, high-quality steel is very strict to the content requirement of sulphur, oxygen and non-metallic inclusion, require S≤0.005% in the steel as high-grade pipe line steel, total oxygen in the Pinion Steel requirement steel (T[O])≤0.0015%, and the molten steel of smelting out with common steel melting furnace merely has been difficult to satisfy such specification of quality.On the other hand,, shorten the heat, also wish the part task transfers of steel melting furnace is gone to finish outside stove for enhancing productivity.Therefore, external refining is subject to people's attention day by day, and it has effects such as improving the quality of products, improve Steel Capacity, expansion kind and reduces cost in STEELMAKING PRODUCTION.
The refining deslagging process promptly is a kind of in numerous furnace outer refining technologies, has characteristics such as simple and easy to do, with low cost, is one of important technology of producing high-quality steel.The refining deslagging process is to add refining slag to ladle in the converter tapping process, utilize the powerful stirring kinetic energy of high-temperature molten steel, refining slag and the quick mixing of molten steel are dissolved each other, make it to take place liquid-liquid reactions, reach the effect of desulfurization, removal steel water oxygen and non-metallic inclusion.In existing wash heat technology, refining slag is divided into solid slag and liquid slag two big classes, and Electric furnace steel making is used liquid slag more, converter steelmaking multi-purpose solid slag.The used slag system of solid slag is mainly four big class: CaO (quickened lime), CaO-Al
2O
3, CaO-SiO
2-Al
2O
3, CaO-SiO
2-CaF
2, also add CaC in some refining slags
2, Na
2CO
3, material such as MgO, heat-generating agent.The adding mode of refining slag have add ladle before the tapping at the bottom of, tapping begin to add mix dash and alloying finish to add mix dash etc. several, its with converter under the slag of slag and deoxidation, alloying formation form ladle slag jointly.
In use there is the following problem in existing wash heat with refining slag:
1, basicity is on the low side, is unfavorable for follow-up refining desulfuration, deoxidation and the removal non-metallic inclusion of Al deoxidization steel.If only use quickened lime as refining slag, though can significantly improve the basicity of the ladle slag that tapping process forms, the fusing point height of quickened lime, required heat fused time of refining process is long, and rhythm of production is caused disadvantageous effect;
2, desulfurization degree is low, about 30%, can not satisfy the production requirement of some low-sulfurs, ultralow-sulfur steel usually;
3, contain CaC
2Synthetic slag in adition process, can produce CO, CO
2Splash takes place in gas, ladle slag easily, has potential safety hazard.
Therefore how research is by disposing the chemical ingredients of refining slag, suitably improve its basicity and desulfurization degree, when being applied to the wash heat of converter tapping process, in ladle, can form high basicity liquid slag layer fast, make the molten steel nitrogen increased amount few, the requirement of satisfying refinement and deoxidation simultaneously and removing non-metallic inclusion.Refining slag with suitable chemical ingredients proportioning can guarantee that quality product can guarantee safety in production again, is that converter steelmaking is enhanced productivity, and guarantees the key problem in technology of technology direct motion.
Summary of the invention
The purpose of this invention is to provide a kind of high-basicity refining slag for slag washing of revolving furnace steel-making, when being applied to the wash heat of converter tapping process, fusing is fast, not splash, and desulfuration efficiency is high and stable, the requirement of satisfying refinement and deoxidation and removing non-metallic inclusion.
Purpose of the present invention is achieved through the following technical solutions: a kind of high-basicity refining slag for slag washing of revolving furnace steel-making, form by quickened lime, fluorite and calcined soda for industry.Be specially quickened lime, fluorite and calcined soda for industry mixed by a certain percentage and form.
The chemical ingredients of high-basicity refining slag for slag washing of revolving furnace steel-making of the present invention contains by weight percentage: 70.0%≤CaO≤88%, 0＜SiO
2≤ 3.0%, 0＜Al
2O
3≤ 4.5%, 2.0%≤Na
2O≤4.1%, 8.0%≤CaF
2≤ 13.3%, 0＜MgO≤5.2%, all the other are igloss composition and trace impurities such as P, S, wherein CaO/SiO
2〉=23.3.
The igloss composition mainly is because remaining CO is arranged in the lime
2(general content be lime weight about 2%) has the active effect of the lime of increasing, and the lime back igloss composition that is heated will decompose the gasification discharge.
Further, the chemical ingredients of high-basicity refining slag for slag washing of revolving furnace steel-making of the present invention is preferably (by weight percentage): 70.8%≤CaO≤85%, 0.3%≤SiO
2≤ 2.9%, 0.8%≤Al
2O
3≤ 3.9%, 2.2%≤Na
2O≤3.8%, 8.4%≤CaF
2≤ 12.9%, 0.2%≤MgO≤4.7%, all the other are igloss composition and trace impurities such as P, S.Refining slag in the preferable range has the ability of good desulfurization, deoxy performance and removal non-metallic inclusion.
The hemisphere point temperature of fusion of high-basicity refining slag for slag washing of revolving furnace steel-making of the present invention: 1400～1450 ℃.
The preparation method of high-basicity refining slag for slag washing of revolving furnace steel-making of the present invention is as follows:
1, detects raw material: the chemical ingredients of quickened lime, fluorite, calcined soda for industry;
2, with the quickened lime fragmentation, granularity is not more than 5mm, crosses 180 mesh sieves after the fluorite fragmentation;
3, the condition that satisfies according to high basicity refining slag chemical component weight per-cent, the weight of calculating desired raw material;
4, take by weighing above-mentioned raw materials mixing in disk mixer in proportion;
5, carry out weather-proof dressing.
High-basicity refining slag for slag washing of revolving furnace steel-making moisture content of finished products of the present invention≤1.0%, granularity≤5.0mm.
Compare with refining slag with general converter steelmaking wash heat, refining slag of the present invention mainly contains higher CaO and lower SiO
2, Al
2O
3Component can increase the basicity of refining slag, strengthens absorbing the ability of inclusion; CaF
2Component is content (CaF in the common refining slag about 10% by weight percentage
2Content is more than 20%), and allocated about 5% calcined soda for industry into, can reduce the fusing point of refining slag and improve liquidity, make its fusing fast, not splash; The CaO/SiO of refining slag
2The ratio height can form high basicity liquid slag layer fast in ladle in the converter tapping process, the calcined soda for industry of adding proper content helps to improve desulfuration efficiency (Na
2CO
3Sweetening power extremely strong, but Na
2CO
3Too high levels serious to material corrosions such as ladle linings, therefore at present generally do not contain this raw material in the refining slag that uses), reduce molten steel nitrogen pick-up, and reach deoxidation and remove the purpose of non-metallic inclusion.
Embodiment
The invention will be further elaborated below in conjunction with embodiment.Embodiment only is used to illustrate the present invention, rather than limits the present invention by any way.
The raw material that embodiment adopts is as follows, all is weight percentage when below relating to percentage ratio:
The chemical constitution of quickened lime: 100%＞CaO 〉=90.0%, 5% 〉=MgO＞0,2.5% 〉=SiO
2＞0, all the other are igloss and Al
2O
3, trace impurities such as P, S;
The chemical constitution of fluorite: 100%＞CaF
2〉=90%, 6% 〉=SiO
2＞0,4% 〉=Al
2O
3＞0;
The chemical constitution of calcined soda for industry: 100%＞Na
2CO
3〉=95%.
At first detect the chemical ingredients of raw material, and with the quickened lime fragmentation, granularity is not more than 5mm, cross 180 mesh sieves after the fluorite fragmentation, according to the satisfied condition of high basicity refining slag chemical component weight per-cent, calculate the weight of desired raw material again, the concrete raw material consumption of following examples sees Table 1:
The consumption of raw material among table 1 embodiment
Embodiment 1
Take by weighing desired raw material in ratio shown in the table 1, with making high basicity refining slag behind the disk mixer mixing.The high basicity refining slag composition (weight percent) that obtains is: CaO:72.2%, SiO
2: Al 2.7%,
2O
3: Na 3.2%,
2O:2.8%, CaF
2: MgO:3.5% 11.6%,, all the other are igloss composition and trace impurities such as P, S, wherein CaO/SiO
2=26.7.
When this high basicity refining slag is used for converter smelting 20CrMoH steel, be 0.010% in the smelting endpoint molten steel sulphur content, full iron (TFe) content of smelting endpoint slag is 30.5%, CaO/SiO
2=6.0.The quantity of slag is 10kg/t under the tapping process
SteelCondition under, when beginning tapping pressed 7kg/t
SteelAmount add this high basicity refining slag and carry out wash heat, the tapping process desulfurization degree is 50%, the molten steel nitrogen increased amount is 0.00050%, formed ladle slag CaO/SiO
2=7.5, square billet S:0.005%, the T[O of casting]: 0.0010%.High about 20 percentage points of the general deslagging process of the desulfurization degree of tapping process, the molten steel nitrogen increased amount descends about 40%, the square billet of casting satisfies high-quality steel requirement, and rolling bar A, the rank that category-B is mingled with are in 1.5 grades, and the rank that C, D class are mingled with is in 1.0 grades.Do not see that materials such as ladle lining have erosion.
Embodiment 2
Take by weighing desired raw material in ratio shown in the table 1, with making high basicity refining slag behind the disk mixer mixing.The high basicity refining slag composition (weight percent) that obtains is: CaO:74.6%, SiO
2: Al 1.8%,
2O
3: Na 2.6%,
2O:2.7%, CaF
2: MgO:4.4% 9.4%,, all the other are igloss composition and trace impurities such as P, S, wherein CaO/SiO
2=41.4.
When this high basicity refining slag is used for converter smelting 20CrMoH steel, be 0.008% in the smelting endpoint molten steel sulphur content, full iron (TFe) content of smelting endpoint slag is 25.6%, CaO/SiO
2=6.1.The quantity of slag is 10kg/t under the converter tapping process
SteelCondition under, when beginning tapping pressed 7.8kg/t
SteelAmount add this high basicity refining slag and carry out wash heat, the tapping process desulfurization degree is 75%, the molten steel nitrogen increased amount is 0.00040%, formed ladle slag CaO/SiO
2=8.4, square billet S:0.002%, the T[O of casting]: 0.00090%.High about 20 percentage points of the general deslagging process of the desulfurization degree of tapping process, the molten steel nitrogen increased amount descends about 40%, the square billet of casting satisfies high-quality steel requirement, and rolling bar A, the rank that category-B is mingled with are in 1.5 grades, and the rank that C, D class are mingled with is in 1.0 grades.Do not see that materials such as ladle lining have erosion.
Embodiment 3
Take by weighing desired raw material in ratio shown in the table 1, with making high basicity refining slag behind the disk mixer mixing.The high basicity refining slag composition (weight percent) that obtains is: CaO:73.3%, SiO
2: Al 2.4%,
2O
3: Na 2.7%,
2O:2.8%, CaF
2: MgO:4.0% 10.5%,, all the other are igloss composition and trace impurities such as P, S, wherein CaO/SiO
2=30.5.
When this high basicity refining slag is used for the smelting of P510L steel converter, be 0.011% in the smelting endpoint molten steel sulphur content, full iron (TFe) content of smelting endpoint slag is 30.6%, CaO/SiO
2=4.8.Quantity of slag 9.5kg/t under the converter tapping process
SteelCondition under, when beginning tapping pressed 5.3kg/t
SteelAmount add this high basicity refining slag and carry out wash heat, the tapping process desulfurization degree is 45.5%, the molten steel nitrogen increased amount is 0.00030%, formed ladle slag CaO/SiO
2=6.4, slab S:0.006%, the T[O of casting]: 0.00170%.High about 20 percentage points of the general deslagging process of the desulfurization degree of tapping process, the molten steel nitrogen increased amount descends about 40%, and A, B, C, D class are mingled with grading and all satisfy standard-required well after the slab hot rolling of casting.Do not see that materials such as ladle lining have erosion.
Claims (7)
1, a kind of high-basicity refining slag for slag washing of revolving furnace steel-making is characterized in that: the moiety of described refining slag is by weight percentage: 70.0%≤CaO≤88%, 0＜SiO
2≤ 3.0%, 0＜Al
2O
3≤ 4.5%, 2.0%≤Na
2O≤4.1%, 8.0%≤CaF
2≤ 13.3%, 0＜MgO≤5.2%, all the other are igloss composition and trace impurity, dual alkalinity CaO/SiO
2〉=23.3; Described trace impurity is P, S.
2, high-basicity refining slag for slag washing of revolving furnace steel-making as claimed in claim 1 is characterized in that: the moiety that described refining slag contains is by weight percentage: 70.8%≤CaO≤85%, 0.3%≤SiO
2≤ 2.9%, 0.8%≤Al
2O
3≤ 3.9%, 2.2%≤Na
2O≤3.8%, 8.4%≤CaF
2≤ 12.9%, 0.2%≤MgO≤4.7%, all the other are igloss composition and trace impurity, dual alkalinity CaO/SiO
2〉=23.3; Described trace impurity is P, S.
3, high-basicity refining slag for slag washing of revolving furnace steel-making as claimed in claim 1 or 2 is characterized in that: the hemisphere point temperature of fusion of described refining slag: 1400～1450 ℃.
4, high-basicity refining slag for slag washing of revolving furnace steel-making as claimed in claim 1 or 2 is characterized in that: described refining slag is made by quickened lime, fluorite and calcined soda for industry mixing in disk mixer.
5, high-basicity refining slag for slag washing of revolving furnace steel-making as claimed in claim 1 or 2 is characterized in that: refining slag moisture content of finished products≤1.0%, granularity≤5.0mm.
6, a kind of preparation method of high-basicity refining slag for slag washing of revolving furnace steel-making as claimed in claim 1 is characterized in that: this method is made up of following steps:
A) detect raw material: the chemical ingredients of quickened lime, fluorite and calcined soda for industry;
B) with quickened lime and fluorite fragmentation;
C) condition that satisfies according to high basicity refining slag chemical component weight per-cent, the weight of calculating desired raw material;
D) take by weighing above-mentioned raw materials mixing in disk mixer in proportion;
E) carry out weather-proof dressing.
7, the preparation method of high-basicity refining slag for slag washing of revolving furnace steel-making as claimed in claim 6 is characterized in that: described step b) is not more than 5mm for quickened lime is crushed to granularity, crosses 180 mesh sieves after the fluorite fragmentation.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4014685A (en) * | 1973-11-27 | 1977-03-29 | Foseco International Limited | Manufacture of steel |
| CN1182799A (en) * | 1997-10-08 | 1998-05-27 | 冶金工业部钢铁研究总院 | Pre-dephosporizing method for molten iron |
| CN1818093A (en) * | 2006-03-08 | 2006-08-16 | 许震 | High-efficient metallurgical refiner and preparation thereof |
-
2007
- 2007-10-10 CN CNB2007102019905A patent/CN100564548C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4014685A (en) * | 1973-11-27 | 1977-03-29 | Foseco International Limited | Manufacture of steel |
| CN1182799A (en) * | 1997-10-08 | 1998-05-27 | 冶金工业部钢铁研究总院 | Pre-dephosporizing method for molten iron |
| CN1818093A (en) * | 2006-03-08 | 2006-08-16 | 许震 | High-efficient metallurgical refiner and preparation thereof |
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