CN1238134C - Tundish covering agent for pure steel, and its making method - Google Patents
Tundish covering agent for pure steel, and its making method Download PDFInfo
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- CN1238134C CN1238134C CNB021119007A CN02111900A CN1238134C CN 1238134 C CN1238134 C CN 1238134C CN B021119007 A CNB021119007 A CN B021119007A CN 02111900 A CN02111900 A CN 02111900A CN 1238134 C CN1238134 C CN 1238134C
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- Prior art keywords
- tundish covering
- covering flux
- raw material
- bauxite
- calcium carbonate
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 82
- 239000010959 steel Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims description 17
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 58
- 239000002994 raw material Substances 0.000 claims abstract description 45
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 29
- 239000006004 Quartz sand Substances 0.000 claims abstract description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 26
- 239000004411 aluminium Substances 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 17
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 15
- 239000010436 fluorite Substances 0.000 claims abstract description 15
- 239000000571 coke Substances 0.000 claims abstract description 9
- 230000004907 flux Effects 0.000 claims description 53
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 52
- 239000000395 magnesium oxide Substances 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 19
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 16
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 16
- 239000004571 lime Substances 0.000 claims description 16
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005054 agglomeration Methods 0.000 claims description 9
- 230000002776 aggregation Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 6
- 238000010411 cooking Methods 0.000 claims description 3
- 238000003672 processing method Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 239000000843 powder Substances 0.000 abstract description 9
- 239000003795 chemical substances by application Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000853 adhesive Substances 0.000 abstract 3
- 230000001070 adhesive effect Effects 0.000 abstract 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 2
- 239000000920 calcium hydroxide Substances 0.000 abstract 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 2
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 2
- 238000005266 casting Methods 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 28
- 239000002893 slag Substances 0.000 description 17
- 239000000292 calcium oxide Substances 0.000 description 14
- 235000012255 calcium oxide Nutrition 0.000 description 14
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 239000005864 Sulphur Substances 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 239000000203 mixture Substances 0.000 description 10
- 229910004298 SiO 2 Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000009749 continuous casting Methods 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000009866 aluminium metallurgy Methods 0.000 description 2
- 239000003575 carbonaceous material Substances 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 235000019353 potassium silicate Nutrition 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000006253 efflorescence Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005713 exacerbation Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000320 mechanical mixture Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 206010037844 rash Diseases 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000009628 steelmaking Methods 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
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
The present invention relates to a tundish covering agent for pure steel, which comprises clinkers, raw materials and adhesives, wherein the clinkers are premelted and account for 69 to 98.8%; the raw materials are not premelted and account for 0.1 to 30%, the adhesives account for 1 to 5%, and the alkalinity R is larger than or equal to 5.0. The clinkers are prepared by that several kinds or all of slaked lime, calcium carbonate, fluorite, bauxite, quartz sand, aluminium ash, etc. are processed; the raw materials comprise calcium carbonate, bauxite, quartz sand, etc. The manufacturing method of the present invention comprises the following steps: firstly, the raw materials, such as slaked lime, calcium carbonate, fluorite, bauxite, quartz sand, aluminium ash, etc. are ground into powders, uniformly mixed and manufactured into blocks; the raw materials are premelted by an electric furnace, or the raw materials are premelted into the clinkers by a cupola furnace according to the coke ration of 200 to 400 after the raw materials are manufactured into the blocks; the raw materials are added in the clinkers, ground into the powders and uniformly mixed; the adhesives, etc. are added to manufacture pulp; the covering agent of a hollow ball shape or a granular shape is manufactured. The covering agent can effectively prevent the resulfurization of tundish molten steel, and prevent the carburization of the molten steel; the present invention can prevent the pollution of the molten steel because of the reaction of the covering agent and the molten steel, and have obvious effects on improving the quality of casting blanks.
Description
Technical field
The present invention relates to a kind of steel-making continuous casting with auxiliary material and manufacture method thereof, relate in particular to clean steel carbon-free tundish covering flux of the high basicity of pre-melted type and manufacture method thereof.
Background technology
Tundish covering flux is to join a kind of artificial synthetic auxiliary material that cover molten steel surface in the tundish in the molten steel continuous casting process.It has following function:
Heat-insulation and heat-preservation reduces molten steel face heat loss;
Secluding air prevents secondary oxidation of steel;
Dissolve the non-metallic inclusion that floats to the molten steel face, purify hot metal.
Along with people are more and more higher to the requirement of steel quality, tundish enters crystallizer last refractory material container before as molten steel, and it more and more comes into one's own to the influence of steel quality, the research work Showed Very Brisk in relevant tundish metallurgy field; One of them is exactly the influence of tundish covering flux to steel quality, as: avoid and the molten steel reaction, prevent to pollute molten steel; Prevent molten steel oxygenation; Prevent that molten steel from returning sulphur, even desulfurization or the like.
Present tundish covering flux mostly is by containing CaO, SiO
2, Al
2O
3, the mineral substance raw material of component such as the MgO carbonaceous material that adds a certain amount of flux and control burn-off rate again directly processes through operations such as Mechanical Crushing, abrasive dust, mixing, granulation, packings; Its basicity R (R=CaO/SiO
2, down together) usually all less than 2.0, phosphorus content is between 2～5%.
Tundish covering flux is opened at continuous casting and is just joined in the tundish when watering, usually all be the required amount of disposable adding, water owing to just opened, tundish is cold bag, the heat of molten steel in it is injected in absorption from big bag, be unavoidable, the coverture of non-pre-melted type all contains a certain amount of carbonate and the crystallization water, just joined in the tundish and can absorb a large amount of heat on the molten steel surface, cause that easily molten steel temperature drop is excessive in the tundish, even can in tundish, produce floating steel, severe exacerbation steel quality by molten steel surface.
Common tundish covering flux all is the mechanical mixture type, its basicity R≤2.0.Studies show that in recent years, the basicity of raising tundish covering flux reduces SiO
2Content to improving the cleannes of molten steel, suppress molten steel and return sulphur etc. tangible effect is all arranged.Research as people such as German B.Bergmann, Britain H.Wdtkinson has all shown this point; Though patent US6174347B1, US6179895B1 also are a kind of tundish covering fluxs of high basicity, but it is not the pre-melted type hollow particle, but the slag charge that utilized ladle metallurgy stove (Ladle Metallgy Furnace) refining to finish is processed into coverture; In addition, be equal in use under the condition of raw mineral materials, impurity contents such as the slag charge sulfur-bearing that refining finishes, iron oxide are handled the slag charge height that obtains than directly using raw mineral materials to carry out fritting, are unfavorable for producing high-quality steel grade, as senior ultralow-sulfur steel etc.Though patent CN1280892A also is a kind of coverture of hollow particle, it is not a pre-melted type, neither high basicity, but magnesia; The fusing point height of this type of coverture joins molten steel surface and is difficult to form effective molten slag layer, the weak effect of secluding air, the production of the clean steel that is unfavorable for.
The content of [C] also is one of the element that must control in the clean steel production process in the steel, effectively prevent the carburetting of molten steel in the tundish, then preferably uses the tundish covering flux of carbon-free or little carbon.Pointing out to use carbon-free covering agent as patent CN1065281C is favourable to production Ultra-low carbon class steel, can effectively prevent the carburetting of molten steel in the tundish.
For high purity steel, except the content of elements such as strictness control nitrogen in steel, sulphur, oxygen, phosphorus, the content of carbon also has strict requirement (generally requiring less than 30ppm), therefore, prevents that tundish covering flux from also being to produce one of key of this series products to the carburetting of molten steel.This just requires the content of carbonaceous material in the tundish covering flux low as far as possible, does not preferably have.One of important process technology of producing high purity steel is exactly to adopt high basicity carbon-free (little carbon) tundish covering flux.
Summary of the invention
Studies show that may there be following reaction in the slag steel in tundish between molten steel and the coverture at the interface:
The generation of above-mentioned reaction can make the total oxygen in the steel increase Al
2O
3Type impurity increases, and is totally unfavorable to producing clean steel.
Calculating according to Lee and Suito shows, belongs to CaO-SiO for composition
2-Al
2O
3Ternary system also has the tundish covering flux of systems such as a spot of other oxide such as MgO, and along with the increase of basicity, the activity coefficient of FeO reduces.Basicity increases, SiO
2Activity also reduce.Therefore, the tundish covering flux of high basicity helps suppressing the carrying out that the slag steel reacts (1), (2) at the interface, avoids the reaction of coverture and molten steel, pollutes molten steel.By following reaction:
As can be known: improve basicity, increase the content of CaO in the slag, help the carrying out of reaction (3), can effectively suppress time sulphur of molten steel in the tundish, improve molten steel desulfurizing efficient.
In a word, in order to make coverture quick slagging in tundish, reduce the temperature drop of molten steel in the tundish; Prevent the reaction of coverture and molten steel, pollute molten steel; Suppress molten steel and in tundish, return sulphur, improve desulfuration efficiency; Prevent that molten steel from being the basic goal of the high basicity of invention pre-melted type carbon-free (little carbon) tundish covering flux in tundish carburetting etc.
Basic ideas of the present invention are with the main source of white lime as alkaline matter (CaO); Metallic aluminium in waste material with the aluminium metallurgy industry---aluminium ash or the AD-powder is an exothermic mixture, reacted product Al
2O
3Be flux; With fluorite and soda is modifier and flux; Carry out the composition adjustment with calcium carbonate, bauxite, magnesia, quartz sand etc., make the high basicity tundish covering flux of pre-melted type of the present invention.
The source of its alkaline matter of tundish covering flux (CaO) of the high basicity of manufacturing pre-melted type is limited, mainly is calcium carbonate, white lime, quick lime.By equation (4), (5) as can be known, under the situation that obtains equivalent CaO, when carrying out the fritting processing with calcium carbonate, the gas flow of its caloric receptivity and generation is all greater than using white lime.This just is being to use white lime, without the reason of calcium carbonate.In addition, when fritting was handled, behind all necessary fragmentation earlier of various raw materials, abrasive dust, the mixing, fritting was carried out in agglomeration again (or granulation).If directly use the source of quick lime as CaO, because quick lime deliquescence very easily absorbs airborne moisture age lime, volumetric expansion makes the material efflorescence again of having made a piece (or make), can make the fritting treatment process to carry out.So when making the tundish covering flux of the high basicity of pre-melted type, also be not suitable for using the source of quick lime as CaO.
By equation (6) as can be known, the reaction of metallic aluminium and oxygen can be emitted a large amount of heat, and the waste material aluminium ash of aluminium metallurgy industry or AD-powder all contain amount of metallic aluminum, utilize it as the raw material of making the high basicity tundish covering flux of pre-melted type, energy consumption in the time of can reducing the fritting processing greatly reduces production costs.
Clean steel tundish covering flux disclosed in this invention comprises the grog of handling through fritting, without the raw material and the binding agent of fritting processing, per distribution ratio by weight, grog accounts for 71.5～95.8%, and raw material account for 0.2～27%, binding agent accounts for 1.5～4.5%, its basicity R 〉=5.0.
Process the required material component of described grog and raw material proportioning (by weight percentage) is: white lime 35.3～63.6%, calcium carbonate 0～15.6%, fluorite 2.5～6.6%, bauxite 0～32.3%, magnesia 0～8.2%, soda 0～3.7%, quartz sand 0～3.5%, aluminium ash 4.0～35.9%;
The proportioning of described raw material (by weight percentage) is: calcium carbonate 0～14%, bauxite 0～10%, magnesia 0～8%, quartz sand 0～2.5%.
Tundish covering flux be shaped as graininess, be preferably the hollow spheres graininess.
Clean steel disclosed by the invention comprises the steps: with the manufacture method of tundish covering flux
A. at first white lime, calcium carbonate, fluorite, bauxite, magnesia, soda, quartz sand, aluminium ash are carried out fritting with electric furnace after according to the following per distribution ratio abrasive dust that accounts for the gross weight of tundish covering flux, mixing, agglomeration and handle and make grog, grog accounts for 71.5～95.8% of tundish covering flux gross weight;
The weight percent proportioning of processing the required material component of described grog and each raw material is: white lime 35.3～63.6%, calcium carbonate 0～15.6%, fluorite 2.5～6.6%, bauxite 0～32.3%, magnesia 0～8.2%, soda 0～3.7%, quartz sand 0～3.5%, aluminium ash 4.0～35.9%;
B. then calcium carbonate, bauxite, magnesia, quartz sand are made raw material according to the following per distribution ratio that accounts for the gross weight of tundish covering flux, raw material account for 0.2～27% of tundish covering flux gross weight:
Described raw material component and its per distribution ratio that accounts for the gross weight of tundish covering flux are: calcium carbonate 0～14%, bauxite 0～10%, magnesia 0～8%, quartz sand 0～2.5%;
C. grog add raw material through abrasive dust, mixing after, add percentage by weight and be 1.5～4.5% binding agent slurrying after make hollow spheres particle coverture after the high-pressure fog, air cooking.
Wherein, the fritting processing method can also be to allocate the material after the agglomeration coke ratio of 200～400kg coke into by material per ton among the described step a, carries out fritting with furnace cupola and handles and make grog.
Described step c can also be after grog is added raw material process abrasive dust, mixing, and adding percentage by weight is that 1.5～4.5% binding agent slurrying is after disk rolls or make the graininess coverture after extruder grain, oven dry.
Tundish covering flux of the present invention is its essential characteristic with fritting, high basicity (R 〉=5.0).The tundish covering flux of pre-melted type is owing to handle through fritting, join in the tundish after, with comparing of non-pre-melted type, slagging is fast, heat absorption is few, the molten steel temperature drop that causes is little.
The specific embodiment
(1) the present invention is that the high basicity of a kind of pre-melted type does not have (little) carbon granule shape tundish covering flux.Allocate part again into by the slag charge of handling through fritting (grog) and form its basicity R 〉=5.0 without the material (raw material) of fritting processing.Grog is the chief component of coverture of the present invention, and raw material mainly are to be used for the composition adjustment.By weight percentage, grog accounts for 71.5～95.8%, and raw material account for 0.2～27%, and binding agent accounts for 1.5～4.5%, its basicity R 〉=5.0.
Grog (fritting handle basic slag charge) manufacture method is: with several in the raw materials such as white lime, calcium carbonate, fluorite, bauxite, magnesia, soda, AD-powder, quartz sand, aluminium ash or all carry out fritting with electric furnace after abrasive dust, mixing, agglomeration and handle; Or with the material after the agglomeration by 200～400 coke ratio (being that material per ton is allocated 200～400kg coke into), carry out fritting with furnace cupola (shaft furnace) and handle.Its proportioning of basic slag charge (percentage by weight) that fritting is handled is:
| White lime 32.0～66.0% | Calcium carbonate 0～18.0% | Fluorite 0.2～7.0% |
| Bauxite 0～35.0% | Magnesia 0～10.0% | Soda 0～5.0% |
| AD-powder 0～15.0% | Quartz sand 0～10.0% | Aluminium ash 2.0～38.0% |
The raw material of allocating into are mainly: these four kinds whole or wherein a kind of of calcium carbonate, bauxite, magnesia, quartz sand or several combination.The consumption of different types of raw material is respectively (by accounting for the tundish covering flux total weight percent): calcium carbonate 0～14%, bauxite 0～10%, magnesia 0～8%, quartz sand 0～2.5%.
The basic slag charge that fritting is handled add raw material through abrasive dust, mixing after, add that binding agent (waterglass, flour etc. wherein one or more) waits slurrying after disk rolls or make the graininess coverture through extruder grain, after drying.
(2) the present invention is that the high basicity of a kind of pre-melted type does not have (little) carbon hollow ball-type tundish covering flux.Allocate part again into by the slag charge of handling through fritting (grog) and form its basicity R 〉=5.0 without the material (raw material) of fritting processing.Grog is the chief component of coverture of the present invention, and raw material mainly are to be used for the composition adjustment.By weight percentage, grog accounts for 71.5～95.8%, and raw material account for 0.2～27%, and binding agent accounts for 1.5～4.5%, its basicity R 〉=5.0.
Grog (fritting handle basic slag charge) manufacture method is: with several in the raw materials such as white lime, calcium carbonate, fluorite, bauxite, magnesia, soda, AD-powder, quartz sand, aluminium ash or all carry out fritting with electric furnace after abrasive dust, mixing, agglomeration and handle; Or with the material after the agglomeration by 200～400 coke ratio (being that material per ton is allocated 200～400kg coke into), carry out fritting with furnace cupola (shaft furnace) and handle.Its proportioning of basic slag charge (percentage by weight) that fritting is handled is:
| White lime 32.0～66.0% | Calcium carbonate 0～18.0% | Fluorite 0.2～7.0% |
| Bauxite 0～35.0% | Magnesia 0～10.0% | Soda 0～5.0% |
| AD-powder 0～15.0% | Quartz sand 0～9.0% | Aluminium ash 2.0～38.0% |
The raw material of allocating into are mainly: these four kinds whole or wherein a kind of of calcium carbonate, bauxite, magnesia, quartz sand or several combination.The consumption of different types of raw material is respectively (by accounting for the tundish covering flux total weight percent): calcium carbonate 0～14%, bauxite 0～10%, magnesia 0～8%, quartz sand 0～2.5%.
The basic slag charge of fritting add raw material through abrasive dust, mixing after, add slurrying such as binding agent (waterglass, CMC, flour etc. wherein one or more) after make hollow spheres particle coverture after the high-pressure fog, air cooking.
Tundish covering flux basicity height of the present invention, Al
2O
3Also high, easy aquation caking stops up spray orifice when carrying out mist projection granulating.Therefore when fritting is handled, add fluorite, soda on the one hand as flux, on the other hand slag charge is carried out modification, reduce the reactivity of slag charge and water.
The tundish covering flux (comparative example 1,2,3) of the high basicity tundish covering flux of pre-melted type of the present invention and original low basicity is tested 100 kilograms of enterprising enforcements usefulness of induction furnace.Under identical condition, use example 1～10 and comparative example 1,2,3 respectively.Example slagging speed is fast, does not corrode furnace lining, and is little to the pollution level of molten steel, causes that the carbon increasing amount of molten steel is little, and have desulfurization significantly, suppress the effect that molten steel returns sulphur.
Table 1 is the batching composition situation of example when of the used grog of example, and table 2 is main chemical compositions and results of use of example and comparative example.As shown in Table 2, example slagging speed is fast, does not corrode furnace lining, and the degree that molten steel is polluted is little, causes that the carbon increasing amount of molten steel is little, suppresses molten steel and returns the effective of sulphur.
The composition % (percentage by weight) of the proportioning of table 1. example grog and example
| The batching example | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||
| The grog proportioning | White lime | 45.8 | 51.6 | 57.1 | 38.9 | 39.4 | 58.1 | 63.6 | 35.3 | 52.8 | 54.0 | |
| Calcium carbonate | 8.2 | 0 | 0 | 6.5 | 13.0 | 0 | 0 | 15.6 | 4.6 | 0 | ||
| Fluorite | 4.7 | 2.8 | 2.5 | 4.7 | 4.5 | 6.6 | 3.2 | 4.5 | 6.0 | 3.2 | ||
| Bauxite | 9.1 | 3.1 | 0 | 14.3 | 0 | 11.8 | 0 | 22.1 | 1.1 | 32.3 | ||
| Soda | 1.9 | 0 | 2.3 | 2.3 | 2.8 | 0 | 0 | 0 | 3.7 | 1.2 | ||
| Magnesia | 4.7 | 6.5 | 0 | 8.2 | 3.0 | 2.6 | 4.2 | 2.7 | 6.1 | 3.5 | ||
| The AD-powder | 0 | 0 | 0 | 6.1 | 12.9 | 0 | 0 | 0 | 1.8 | 0 | ||
| The aluminium ash | 22.6 | 35.9 | 34.6 | 15.5 | 22.6 | 18.7 | 28.0 | 18.4 | 23.5 | 4.0 | ||
| Quartz sand | 3.0 | 0 | 3.5 | 3.5 | 1.8 | 2.2 | 1.0 | 1.4 | 0.4 | 1.8 | ||
| Example is formed | Raw material | Calcium carbonate | 14.0 | 14.0 | 0.2 | 10.0 | 9.0 | 0 | 0 | 7.0 | 5.0 | 0 |
| Bauxite | 6.0 | 0 | 0 | 10.0 | 8.0 | 0 | 0 | 5.0 | 3.0 | 2.0 | ||
| Magnesia | 7.0 | 2.0 | 0 | 1.5 | 3.0 | 8.0 | 0.1 | 0.5 | 1.0 | 3.0 | ||
| Quartz sand | 0 | 0 | 0 | 2.5 | 0 | 0 | 1.0 | 0.5 | 1.0 | 0 | ||
| ∑ | 27.0 | 16.0 | 0.2 | 24.0 | 20.0 | 8.0 | 1.1 | 13.0 | 10.0 | 5.0 | ||
| Grog | 71.5 | 81.5 | 95.8 | 74.1 | 77.4 | 89.0 | 94.4 | 84.6 | 86.7 | 91.5 | ||
| Binding agent | 1.5 | 2.5 | 4.0 | 1.9 | 2.6 | 3.0 | 4.5 | 2.4 | 3.2 | 3.5 | ||
The main chemical compositions of table 2. example and comparative example and result of use
| Main chemical compositions, % | Result of use | ||||||||||
| CaO | SiO 2 | Al 2O 3 | R | Slagging speed | Molten steel temperature drop | Lining wear | Pollute molten steel | Molten steel returns sulphur | Molten steel recarburization | ||
| Example | 1 | 50.6 | 6.0 | 29.7 | 8.4 | Hurry up | Little | Do not have | ＝ | × | - |
| 2 | 49.2 | 2.7 | 36.7 | 18.2 | Hurry up | Little | Do not have | ＝ | × | - | |
| 3 | 49.4 | 6.5 | 39.0 | 7.6 | Hurry up | Little | Slightly | ＝ | × | - | |
| 4 | 33.71 | 6.56 | 36.5 | 5.1 | Hurry up | Little | Do not have | ＝ | × | - | |
| 5 | 46.1 | 4.7 | 38.0 | 9.8 | Hurry up | Little | Do not have | ＝ | × | - | |
| 6 | 51.7 | 5.3 | 26.8 | 9.8 | Hurry up | Little | Do not have | ＝ | × | - | |
| 7 | 48.3 | 4.4 | 31.0 | 11.0 | Hurry up | Little | Do not have | ＝ | × | - | |
| 8 | 43.6 | 6.5 | 40.2 | 6.7 | Hurry up | Little | Slightly | ＝ | × | - | |
| 9 | 50.7 | 4.5 | 29.0 | 11.3 | Hurry up | Little | Do not have | ＝ | × | - | |
| 10 | 44.8 | 7.9 | 31.8 | 5.7 | Hurry up | Little | Do not have | ＝ | × | - | |
| Comparative example | 1 | 27.6 | 33.8 | 24.4 | 0.82 | Slowly | Greatly | Seriously | ++ | √ | + |
| 2 | 31.4 | 14.6 | 21.8 | 2.2 | Slowly | Greatly | Slightly | ++ | √ | + | |
| 3 | 33.4 | 37.2 | 4.0 | 0.90 | Slowly | Greatly | Seriously | ++ | √ | + | |
| Illustrate: 1.R=CaO/SiO 22. it is little to the pollution level of molten steel that comparative example 1,2,3 contains the expression of 1.0～5.0% carbon 3. "=", " ++ " expression is polluted molten steel 4. " * " expression molten steel and is not returned sulphur, " √ " represents that molten steel returns sulphur 5. "-" expression not carburetting of molten steel or carbon increasing amount is little, "+" expression molten steel recarburization | |||||||||||
Claims (7)
1. clean steel tundish covering flux, it is characterized in that: its component and percentage by weight are: grog accounts for 71.5～95.8%, and raw material account for 0.2～27%, and binding agent accounts for 1.5～4.5%;
The weight percent proportioning of processing the required material component of described grog and each raw material is: white lime 35.3～63.6%, calcium carbonate 0～15.6%, fluorite 2.5～6.6%, bauxite 0～32.3%, magnesia 0～8.2%, soda 0～3.7%, quartz sand 0～3.5%, aluminium ash 4.0～35.9%;
Described raw material component and its per distribution ratio that accounts for the gross weight of tundish covering flux are: calcium carbonate 0～14%, bauxite 0～1 0%, magnesia 0～8%, quartz sand 0～2.5%.
2. clean steel tundish covering flux according to claim 1 is characterized in that: its basicity R 〉=5.0.
3. clean steel tundish covering flux according to claim 1 is characterized in that: it is shaped as the graininess coverture.
4. clean steel tundish covering flux according to claim 3 is characterized in that: it is shaped as hollow spheres particle coverture.
5. the manufacture method of a clean steel usefulness tundish covering flux comprises the steps:
A. at first white lime, calcium carbonate, fluorite, bauxite, magnesia, soda, quartz sand, aluminium ash are carried out fritting with electric furnace after according to following proportioning abrasive dust, mixing, agglomeration and handle and to make grog, grog accounts for 71.5～95.8% of tundish covering flux gross weight;
The weight percent proportioning of processing the required material component of described grog and each raw material is: white lime 35.3～63.6%, calcium carbonate 0～15.6%, fluorite 2.5～6.6%, bauxite 0～32.3%, magnesia 0～8.2%, soda 0～3.7%, quartz sand 0～3.5%, aluminium ash 4.0～35.9%;
B. then calcium carbonate, bauxite, magnesia, quartz sand are made raw material according to the following per distribution ratio that accounts for the gross weight of tundish covering flux, raw material account for 0.2～27% of tundish covering flux gross weight;
Described raw material component and its per distribution ratio that accounts for the gross weight of tundish covering flux are: calcium carbonate 0～14%, bauxite 0～10%, magnesia 0～8%, quartz sand 0～2.5%;
C. grog add raw material through abrasive dust, mixing after, add percentage by weight and be 1.5～4.5% binding agent slurrying after make hollow spheres particle coverture after the high-pressure fog, air cooking.
6. the clean steel according to claim 5 manufacture method of tundish covering flux is characterized in that:
The fritting processing method can also be to allocate the material after the agglomeration coke ratio of 200～400kg coke into by material per ton among the described step a, carries out fritting with furnace cupola and handles and make grog.
7. the clean steel according to claim 5 manufacture method of tundish covering flux, it is characterized in that: described step c can also be after grog is added raw material process abrasive dust, mixing, and adding percentage by weight is that 1.5～4.5% binding agent slurrying is after disk rolls or make the graininess coverture after extruder grain, oven dry.
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| TWI403589B (en) * | 2009-04-10 | 2013-08-01 | China Steel Corp | Granular humectant liquid steel and its manufacturing method |
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| TWI403589B (en) * | 2009-04-10 | 2013-08-01 | China Steel Corp | Granular humectant liquid steel and its manufacturing method |
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