CN101191170A - Method for smelting stainless steel oxidizing slag by using argon oxygen furnace - Google Patents
Method for smelting stainless steel oxidizing slag by using argon oxygen furnace Download PDFInfo
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- CN101191170A CN101191170A CNA2006101186253A CN200610118625A CN101191170A CN 101191170 A CN101191170 A CN 101191170A CN A2006101186253 A CNA2006101186253 A CN A2006101186253A CN 200610118625 A CN200610118625 A CN 200610118625A CN 101191170 A CN101191170 A CN 101191170A
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- slag
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- stainless steel
- lime
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- 239000002893 slag Substances 0.000 title claims abstract description 77
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 27
- 239000010935 stainless steel Substances 0.000 title claims abstract description 27
- 238000003723 Smelting Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 title abstract description 9
- 230000001590 oxidative effect Effects 0.000 title description 2
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 38
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 38
- 239000004571 lime Substances 0.000 claims abstract description 38
- 230000003647 oxidation Effects 0.000 claims abstract description 37
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 37
- 239000011572 manganese Substances 0.000 claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 17
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 17
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000007664 blowing Methods 0.000 claims abstract description 16
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052786 argon Inorganic materials 0.000 claims abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007670 refining Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 239000012452 mother liquor Substances 0.000 claims description 24
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 239000010436 fluorite Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 6
- 238000002844 melting Methods 0.000 abstract description 6
- 238000005261 decarburization Methods 0.000 abstract description 5
- 230000008018 melting Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 abstract 1
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 abstract 1
- 229910052698 phosphorus Inorganic materials 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 13
- 238000005262 decarbonization Methods 0.000 description 6
- 230000002829 reductive effect Effects 0.000 description 6
- 229910004261 CaF 2 Inorganic materials 0.000 description 5
- 239000004411 aluminium Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 235000019739 Dicalciumphosphate Nutrition 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- NEFBYIFKOOEVPA-UHFFFAOYSA-K dicalcium phosphate Chemical compound [Ca+2].[Ca+2].[O-]P([O-])([O-])=O NEFBYIFKOOEVPA-UHFFFAOYSA-K 0.000 description 1
- 229940038472 dicalcium phosphate Drugs 0.000 description 1
- 229910000390 dicalcium phosphate Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 235000021321 essential mineral Nutrition 0.000 description 1
- 229910052840 fayalite Inorganic materials 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HUAUNKAZQWMVFY-UHFFFAOYSA-M sodium;oxocalcium;hydroxide Chemical compound [OH-].[Na+].[Ca]=O HUAUNKAZQWMVFY-UHFFFAOYSA-M 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910052841 tephroite Inorganic materials 0.000 description 1
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a slag melting method for Argon-Oxygen furnace smelting stainless steel oxidized dross, comprising the procedures that, 1) mass percentage chemical compositions of the crude stainless steel liquid are; 1.5 to 3.5 percent of C, 0 to 0.40 percent of Si, 0 to 0.40 percent of Mn, 8.0 to 30.0 percent of Cr, 0 to 20.0 percent of Ni, no more than 0.03 percent of S, no more than 0.04 percent of P, the balance Fe and incidental impurities; 2) oxidation phase, 3) reduction phase, 4) refining phase. The 2) Oxidation phase is that: lime is added before charging crude stainless steel liquid into Argon-Oxygen furnace to increase the degree of basicity of initial dross. The temperature of steel liquid increases gradually as blowing refinement processes; lime and low-grade manganese ore are added in batches to form complete liquid dross. The 3) reduction phase is that: silicon iron is added to reduce steel liquid and slag, during which only argon gas is used for blowing refinement. The 4) refining phase is that: components are adjusted to target components, during which argon or nitrogen gas is used for blowing refinement. The invention has good slag melting effect during oxidation phase with the Argon-Oxygen furnace, increases decarburization speed, decreases smelting period, thereby improving manufacture efficiency, extending the service life of furnace lining and reducing consumption and cost.
Description
Technical field
The invention belongs to the stainless steel smelting field, particularly the slagging method of argon oxygen stove (AOD stove) smelting stainless steel technology and oxidation sludge thereof.
Background technology
Argon oxygen stove (AOD stove) converter is the major equipment of smelting stainless steel, and according to incompletely statistics, the whole world accounts for about 70% of stainless steel ultimate production via the stainless steel of AOD converter smelting at present.Adopt AOD converter smelting stainless steel whole process to be broadly divided into oxidation period, reduction period and refining period.Wherein the used time of oxidation period accounts for the 60-70% of one heat steel smelting cycle.
The purpose of oxidation period is to realize under atmospheric condition molten steel " decarburization and cr yield ", and promptly [Cr] lacks under the prerequisite of oxidation as far as possible in guaranteeing molten steel, [C] in the oxidation removal molten steel, and finally reach the requirement of target value.The main method of taking is determined the volume ratio of blowing gas according to [C] content in the molten steel, oxidation period different phasic change blowing gas volume ratio (for example: O
2: Ar=3: 1,1: 1,1: 2,1: 3 etc.), thus the purpose of realization " decarburization and cr yield ".
Mainly carry out the molten steel decarburization oxidation period, according to carbon content in the molten steel carbon rejection process roughly is divided into four-stage usually, adopts different argon oxygen volume ratios to blow in each different stage.Should be pointed out that the part steel grade in the stainless steel also adopts nitrogen and argon gas proportioning to blow.Typical blowing oxidation period pattern sees Table 1.
Table 1
| The blowing stage | The carbon content scope | Argon oxygen volume ratio | Oxygen flow | Argon flow amount | Remarks |
| The 1st stage | ＞0.6％ | O 2∶Ar＝3∶1 | 120m 3 | 40m 3 | Adopt the top rifle |
| The 2nd stage | 0.3-0.6％ | O 2∶Ar＝1∶1 | 80m 3 | 80m 3 | - |
| The 3rd stage | 0.1-0.3％ | O 2∶Ar＝1∶2 | 50m 3 | 110m 3 | - |
| The 4th stage | 0.005-0.1％ | O 2∶Ar＝1∶3 | 40m 3 | 120m 3 | - |
After carbon content reaches target call in the molten steel, promptly change reduction period over to.Reduction period mainly be to add reductive agent (ferrosilicon and/or metallic aluminium etc.) molten steel is carried out deoxidation, the and (Cr in the reduced blast furnace
2O
3).Concrete chemical equation is as follows:
Steel liquid deoxidation [Si]+2[O]=SiO
2(1)
Cr in the reduced blast furnace
2O
33[Si]+2 (Cr
2O
3)=4[Cr]+3SiO
2(2)
" steel-making is exactly to refine slag ", slag plays crucial effect in smelting process.(FeO), (Cr in the oxidation period slag
2O
3) with steel in [C] oxidizing reaction takes place, can remove carbon contained in the molten steel.Chemical equation is as follows:
[C]+(FeO)＝[Fe]+CO (3)
3[C]+(Cr
2O
3)＝2[Cr]+3CO (4)
In addition, need to store a large amount of lime oxidation period in the slag, ready for forming the good reduction period slag of reductibility.
Reduction period adopts ferro-silicon (Si content is about 65-75%) that molten steel and slag are reduced usually, can form a large amount of SiO after the reaction
2Enter slag, see reaction formula (1).According to chemical equation, the 1kg pure silicon will oxidation generates the SiO of 2.14kg
2Enter slag.
Good in order to guarantee the reduction of molten steel and slag, need be with reduction period basicity of slag (CaO/SiO
2) be controlled at 〉=1.5 level.Because the reduction period time is lacked (5-15min), add lime when adding ferrosilicon, lime is scorification rapidly, forms the satisfactory slag of basicity.Therefore before just requiring to add ferrosilicon, promptly stock enough lime (containing CaO about 90%) in the slag so that the SiO that after the deoxidation of the rapid balance ferrosilicon of reduction period, generates in oxidation period
2, form the good slag of reductibility, so must in slag, add excessive lime oxidation period.
Oxidation period is when existing excessive lime in the slag, and lime just can not scorification, and lime is bulk and is present in the slag, and in this case, oxidation sludge seems to be block to be piled up, i.e. the part adhesion of slag of having melted is at not molten lime particle outside surface.Because the proportion of lime is less, slag will float over the molten steel surface in the oxidation period converting process, and such slag is unfavorable for fully contact and reaction between steel, the slag.Being unfavorable for that decarburizing reaction gets fully between steel, the slag carries out, and causes that decarbonization rate is on the low side, tap to tap time is long, consumption and cost be higher.
Because [Cr] content higher (usually＞10%) therefore in the process of AOD converter smelting oxidation period, should not adopt following common method slag (fusing lime) in the mother liquor of stainless steel.
1) adopts firebrick piece (SiO
2The about 60-70% of content) changes slag.SiO in the firebrick piece
2Can following reaction take place with the CaO in the lime:
nCaO+SiO
2＝nCaO·SiO
2 (5)
Generate CaOSiO
2(1550 ℃ of fusing points), 2CaOSiO
2(2130 ℃ of fusing points), 3CaOSiO
2Mineral such as (1480 ℃ of fusing points), thus lime is melted.But this method can not be used for the oxidation period of AOD stove, and reason is to adopt SiO
2Change the basicity (CaO/SiO that slag will reduce slag oxidation period significantly
2), common basicity can be reduced to about below 3.0, that is to say, does not have enough CaO to can be used for the SiO that balance ferrosilicon reduction molten steel generates in the oxidation sludge
2, cause the reduction period basicity of slag to be reduced to below 1.0, can't realize reduction to molten steel and slag, realize predetermined smelting target.
2) adopt iron scale (FeO (Fe
2O
3) account for 85-95%) change slag.FeO (Fe
2O
3) can form low-melting CaOFe with CaO
2O
3(1220 ℃ of fusing points), 2CaOFe
2O
3(1420 ℃ of fusing points), thus lime melted preferably, form liquid slag.Reaction formula is as follows:
nCaO+Fe
2O
3＝nCaO·Fe
2O
3 (6)
But, owing to [Cr] content in the mother liquor of stainless steel that is blended into the AOD converter higher (usually 〉=10%), FeO (Fe in the slag
2O
3) when higher, can make [Cr] a large amount of oxidations in the molten steel, chemical equation is as follows:
3(FeO)+2[Cr]＝3[Fe]+(Cr
2O
3) (7)
[Cr] a large amount of oxidations are just in time opposite with the target of smelting stainless steel " decarburization and cr yield " in the molten steel.Therefore, can not adopt adding iron scale slag.
3) adopt fluorite (CaF
2Account for 75-85%) the change slag.CaF
2Can form low melting point CaOCaF mutually with CaO
2(1400 ℃ of fusing points), can be very fast with the lime fusing, still, adopt CaF oxidation period at AOD
2The subject matter of changing the existence of slag is the CaF in the slag
2Be lower than at 10% o'clock and change slag DeGrain, CaF in the slag
2Erosion to the AOD converter lining when content is higher is very serious, will cause lining life to shorten, and CaF
2It is shorter to change the slag effect hold-time.Reason is to have following reaction in the slag:
(SiO
2)+2(CaF
2)＝2(CaO)+SiF
4(g) (8)
CaF in the general slag
2Do not influence the basicity of slag during content not high (＜10%), along with the carrying out of reaction, CaF
2Can consume the SiF of generation
4Be the gaseous state volatilization, the basicity of slag and viscosity will increase gradually.
4) adopt aluminium slag (Al
2O
3Account for 70-80%) the change slag.Al in the aluminium slag
2O
3Can generate low-melting calcium aluminate with the CaO reaction, reaction formula is as follows:
nCaO+Al
2O
3＝nCaO·Al
2O
3 (9)
But, because konite furnace lining, the Al in the slag are all adopted in the AOD converter of smelting stainless steel usually
2O
3Also can react with the CaO in the furnace lining, thus very serious to the erosion action of furnace lining, so can not adopt aluminium slag (Al
2O
3) the change slag.
Summary of the invention
The object of the present invention is to provide a kind of slagging method of AOD stove smelting stainless steel oxidation sludge, adopt this method fusing lime, form good liquid slag, thereby promote fully contact and reaction between steel, the slag, improve decarbonization rate, shorten the heat, reduce consuming and cost.
For achieving the above object, technical scheme of the present invention is:
A kind of slagging method of AOD stove smelting stainless steel oxidation sludge, it comprises the steps:
1) the chemical ingredients mass percent of mother liquor of stainless steel is: C 1.5-3.5, Si 0-0.40, Mn0-0.40, Cr 8.0-30.0, Ni 0-20.0, S≤0.03, P≤0.04, surplus are Fe and inevitable impurity;
2) oxidation period
2.1AOD before stove is blended into mother liquor of stainless steel, in the AOD stove, add lime 4-25kg/ ton steel, then mother liquor is blended into, the mother liquor temperature is at 1450-1550 ℃, and C content is at 1.5-3.5wt%;
2.2 be blown into blowing gas, proportioning O by the air port
2: Ar (or N
2) volume ratio is (3-10): 1, when the mother liquor temperature after 1530-1720 ℃, add lime 4-17kg/ ton steel successively, and add poor manganese ore 0.4-21Kg/ ton steel (account for the 5-50% that adds the lime total amount, down with);
2.3 when mother liquor 0.3%＜[C]＜0.6%, blowing gas mixing ratio O
2: Ar (or N
2) volume ratio is (0.5-3): 1, the mother liquor temperature adds lime 4-8kg/ ton steel, poor manganese ore 0.2-4Kg/ ton steel again at 1530-1720 ℃;
2.4 when mother liquor 0.1%＜[C]＜0.3%, blowing gas mixing ratio O
2: Ar (or N
2) be 1: (1-3), the mother liquor temperature adds lime 4-8kg/ ton steel, poor manganese ore 0.2-4Kg/ ton steel once more at 1530-1720 ℃;
2.5 mother liquor [C] content is from 0.1% until aim carbon content, blowing gas mixing ratio O
2: Ar (or N
2) be 1: (3-10), generally no longer add slag charge;
3) reduction period: add ferrosilicon 8-30kg/ ton steel to steel liquid and slag and reduce, and add lime 0-17kg/ ton steel, fluorite 8-17kg/ ton steel, during only blow with Ar gas.
4) refining period: the molten steel composition is adjusted in the scope of target composition requirement, blow with argon gas (or nitrogen) refining period.
Further, the chemical ingredients mass percent of described poor manganese ore is: SiO
222-32, MnO41-49, Al
2O
34-5, TFe 11-18, surplus are unavoidable impurities.
Described MnO comprises MnO
2, Mn
2O
3
Before being blended into mother liquor of stainless steel, the main effect that adds lime (step 2.1) is the basicity of raising initial stage slag, alleviates the erosion action of initial stage slag to furnace lining.Carrying out along with converting process, molten steel temperature improves gradually, add slag charge (step 2.2,2.3,2.4) successively in batches, it mainly acts on is to be the enough lime of reduction period deposit, simultaneously, add poor manganese ore according to corresponding ratio, so just can promote the scorification of stove sodalime, the full liquid slag of very fast formation.
Such slag can increase the contact area of slag and molten steel greatly, quickens the decarburizing reaction between steel, the slag, thereby can shorten smelting cycle, and extending furnace lining life reduces cost and consumes.
The purpose that in batches adds lime successively is to avoid the large quantities of concentrated addings of slag charge to cause molten steel temperature to descend rapidly on the one hand, thereby reduces decarbonization rate; The 2nd, avoid under molten steel carbon content condition with higher, can reducing decarbonization rate when the quantity of slag is excessive.
Contain SiO in the poor manganese ore
2, FeO (Fe
2O
3), component such as MnO, these components can play the effect of fusing lime to a certain extent.Particularly, SiO
2Can form CaOSiO with CaO
2, 2CaOSiO
2Deng mineral, thus fusing lime;
FeO can form the mineral of fusing point such as calcium ferrite with CaO, thus fusion lime, the effect of reaching slag;
MnO can form low-melting mixture with FeO, MgO etc.
In addition, FeO, MnO etc. can also promote 2CaOSiO
2Fusing Deng the high-melting-point mineral.The essential mineral that forms in the slag is monticellite m[(FeMnMgCa) SiO
4], it is by tephroite (2MnOSiO
2), fayalite (2FeOSiO
2) and Dicalcium Phosphate (Feed Grade) (2CaOSiO
2) mixed crystal.When (MnO) was high, monticellite was with 2FeOSiO
2And 2MnOSiO
2Be main.
Beneficial effect of the present invention
AOD stove slag oxidation period of the present invention is good, can improve decarbonization rate 0.002-0.05%/min, shortens the heat 5-8 minute, thereby enhances productivity, and extending furnace lining life reduces consuming and cost.
Embodiment
Embodiment is referring to table 2.
As shown in Table 2,
When 1) adopting the poor manganese ore slag, lime and light dolomite can be used as slag making materials.
2) consumption of poor manganese ore accounts for the 5.0-50.0% (seeing embodiment 1,5) of the total consumption of other slag charges.
3) the mother liquor of stainless steel temperature should be controlled at 1530 ℃-1720 ℃.
It is pointed out that blowing gas (Ar, O when adopting the poor manganese ore slag
2) consumption is identical during with conventional the smelting.
The significant parameter of table 2 poor manganese ore slag embodiment and Comparative Examples
By table 2 as seen, compare with Comparative Examples 1,2, embodiment adds the poor manganese ore of other slag making materialses (being lime and rhombspar) total amount 5-50% stainless oxidation period at the AOD converter smelting, can under the condition of 1530-1750 ℃ of molten steel in the stove temperature, impel the lime fusing, form the full liquid slag of good fluidity.
Compare with original technology, dissolving good slag can fully react with molten steel, improves decarbonization rate, shortens the heat, and extending furnace lining life reduces consuming and cost.
Claims (3)
1. the slagging method of an AOD stove smelting stainless steel oxidation sludge, it comprises the steps:
1) the chemical ingredients mass percent of mother liquor of stainless steel is: C 1.5-3.5, Si 0-0.40, Mn0-0.40, Cr 8.0-30.0, Ni 0-20.0, S≤0.03, P≤0.04, surplus are Fe and inevitable impurity;
2) oxidation period
2.1AOD before stove is blended into mother liquor of stainless steel, in the AOD stove, add lime 4-25kg/ ton steel, then mother liquor is blended into, the mother liquor temperature is at 1450-1550 ℃, and C content is at 1.5-3.5wt%;
2.2 be blown into blowing gas, proportioning O by the air port
2: Ar (or N
2) volume ratio is (3-10): 1, when the mother liquor temperature after 1530-1720 ℃, add lime 4-17kg/ ton steel successively, and add poor manganese ore 0.4-21Kg/ ton steel;
2.3 when mother liquor 0.3%＜[C]＜0.6%, blowing gas mixing ratio O
2: Ar (or N
2) volume ratio is (0.5-3): 1, the mother liquor temperature adds lime 4-8kg/ ton steel, poor manganese ore 0.2-4Kg/ ton steel again at 1530-1720 ℃;
2.4 when mother liquor 0.1%＜[C]＜0.3%, blowing gas mixing ratio O
2: Ar (or N
2) volume ratio is 1: (1-3), the mother liquor temperature adds lime 4-8kg/ ton steel, poor manganese ore 0.2-4Kg/ ton steel once more at 1530-1720 ℃;
2.5 mother liquor [C] content is from 0.1% until aim carbon content, blowing gas mixing ratio O
2: Ar (or N
2) volume ratio is 1: (3-10), no longer add slag charge;
3) reduction period: add ferrosilicon 8-30kg/ ton steel to steel liquid and slag and reduce, and add lime 0-17kg/ ton steel, fluorite 8-17kg/ ton steel, during only blow with argon gas.
4) refining period: the molten steel composition is adjusted in the scope of target composition requirement, blow with argon gas or nitrogen refining period.
2. the slagging method of AOD stove smelting stainless steel oxidation sludge as claimed in claim 1 is characterized in that the chemical ingredients mass percent of described poor manganese ore is: SiO
222-32, MnO 41-49, Al
2O
34-5, TFe 11-18, surplus are unavoidable impurities.
3. the slagging method of AOD stove smelting stainless steel oxidation sludge as claimed in claim 2 is characterized in that described MnO comprises MnO
2, Mn
2O
3
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|---|---|---|---|
| CNB2006101186253A CN100535152C (en) | 2006-11-22 | 2006-11-22 | Method for smelting stainless steel oxidizing slag by using argon oxygen furnace |
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| CN100535152C CN100535152C (en) | 2009-09-02 |
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| CN105567907A (en) * | 2016-01-06 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for controlling plastic inclusions of austenitic stainless steel |
| CN107217123A (en) * | 2017-05-26 | 2017-09-29 | 响水恒生不锈钢铸造有限公司 | A kind of AOD tappings processing method |
| CN107245637A (en) * | 2017-06-26 | 2017-10-13 | 永兴特种不锈钢股份有限公司 | A kind of AOD smelts the method and a kind of AOD furnace of high manganese stainless steel |
| CN110218844A (en) * | 2019-05-22 | 2019-09-10 | 武汉市海易通特种材料科技有限公司 | Ferrous acid calcium complexes, preparation method and the stainless steel smelting method using it |
| CN112342338A (en) * | 2020-10-16 | 2021-02-09 | 中冶南方工程技术有限公司 | Electric furnace stainless steel smelting method for controlling chromium pollution in steel slag |
| CN113493881A (en) * | 2021-06-24 | 2021-10-12 | 江苏良工精密合金钢有限公司 | Super-pure heat-resistant stainless steel bar and manufacturing process thereof |
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| CN103014242A (en) * | 2012-12-18 | 2013-04-03 | 永兴特种不锈钢股份有限公司 | Smelting slagging agent and smelting slagging method adopting AOD (Argon Oxygen Decarburization) double slag process |
| CN103014242B (en) * | 2012-12-18 | 2014-04-02 | 永兴特种不锈钢股份有限公司 | Smelting slagging agent and smelting slagging method adopting AOD (Argon Oxygen Decarburization) double slag process |
| CN105567907A (en) * | 2016-01-06 | 2016-05-11 | 山西太钢不锈钢股份有限公司 | Method for controlling plastic inclusions of austenitic stainless steel |
| CN107217123A (en) * | 2017-05-26 | 2017-09-29 | 响水恒生不锈钢铸造有限公司 | A kind of AOD tappings processing method |
| CN107245637A (en) * | 2017-06-26 | 2017-10-13 | 永兴特种不锈钢股份有限公司 | A kind of AOD smelts the method and a kind of AOD furnace of high manganese stainless steel |
| CN107245637B (en) * | 2017-06-26 | 2019-04-12 | 永兴特种不锈钢股份有限公司 | A kind of AOD smelts the method and a kind of AOD furnace of high manganese stainless steel |
| CN110218844A (en) * | 2019-05-22 | 2019-09-10 | 武汉市海易通特种材料科技有限公司 | Ferrous acid calcium complexes, preparation method and the stainless steel smelting method using it |
| CN112342338A (en) * | 2020-10-16 | 2021-02-09 | 中冶南方工程技术有限公司 | Electric furnace stainless steel smelting method for controlling chromium pollution in steel slag |
| CN112342338B (en) * | 2020-10-16 | 2022-05-13 | 中冶南方工程技术有限公司 | Electric furnace stainless steel smelting method for controlling chromium pollution in steel slag |
| CN113493881A (en) * | 2021-06-24 | 2021-10-12 | 江苏良工精密合金钢有限公司 | Super-pure heat-resistant stainless steel bar and manufacturing process thereof |
| CN116005160A (en) * | 2022-12-12 | 2023-04-25 | 东莞市灿煜金属制品有限公司 | High-precision 316L stainless steel plate polishing process |
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