CN106702075B - A kind of method that welding wire steel increases sulphur - Google Patents
A kind of method that welding wire steel increases sulphur Download PDFInfo
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- CN106702075B CN106702075B CN201710035688.0A CN201710035688A CN106702075B CN 106702075 B CN106702075 B CN 106702075B CN 201710035688 A CN201710035688 A CN 201710035688A CN 106702075 B CN106702075 B CN 106702075B
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 93
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003466 welding Methods 0.000 title claims abstract description 32
- 239000005864 Sulphur Substances 0.000 title claims abstract description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 242
- 229910052742 iron Inorganic materials 0.000 claims abstract description 121
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 94
- 239000002893 slag Substances 0.000 claims abstract description 85
- 239000011593 sulfur Substances 0.000 claims abstract description 85
- 238000003723 Smelting Methods 0.000 claims abstract description 64
- 239000004571 lime Substances 0.000 claims abstract description 57
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 53
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 53
- 239000011777 magnesium Substances 0.000 claims abstract description 47
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 19
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 238000010079 rubber tapping Methods 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 22
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 9
- 239000008188 pellet Substances 0.000 claims description 3
- 238000007670 refining Methods 0.000 abstract description 33
- 238000009826 distribution Methods 0.000 abstract description 7
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- 238000012417 linear regression Methods 0.000 description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 238000006477 desulfuration reaction Methods 0.000 description 11
- 230000023556 desulfurization Effects 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 9
- 229910052698 phosphorus Inorganic materials 0.000 description 9
- 229910052681 coesite Inorganic materials 0.000 description 8
- 229910052906 cristobalite Inorganic materials 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 8
- 229910052682 stishovite Inorganic materials 0.000 description 8
- 229910052905 tridymite Inorganic materials 0.000 description 8
- 239000004615 ingredient Substances 0.000 description 7
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- 239000000470 constituent Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 241001536352 Fraxinus americana Species 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000002585 base Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000205 computational method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910000514 dolomite Inorganic materials 0.000 description 2
- 239000010459 dolomite Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention provides a kind of method of welding wire steel increasing sulphur, in converter smelting, low-sulfur iron content cold burden is replaced using High sulfur iron ore as iron content cold burden, the sulfur content of the High sulfur iron ore is 0.85wt% or more, while adding slag material lime and magnesium ball.The present invention utilizes the technical principle of slag molten steel low-sulfur distribution ratio under converter oxidizing atmosphere, low-sulfur iron content cold burden is replaced as iron content cold burden by the High sulfur iron ore of 0.85wt% or more using sulfur content in smelting process, meet converter smelting it is thermally equilibrated under the premise of, by improving sulfur content in converter smelting system, improve converter tapping sulfur content, so that the molten steel sulfur content after refining is increased, increases sulphur instead of sulphur line or sulphur iron, sulfur content is made to obtain stability contorting.The experimental results showed that welding wire steel provided by the invention increases the method for sulphur, converter smelting thermal balance disclosure satisfy that, and molten steel sulfur content is controlled substantially in 0.009~0.017wt% after refining, meet finished product control and require.
Description
Technical field
The present invention relates to the methods that metallurgical technology field, more particularly to a kind of welding wire steel increase sulphur.
Background technology
Welding wire is as filling metal or simultaneously as conductive welded wire material, generally (i.e. by welding wire base material
Welding wire steel) to 0.8~1.2mm, the degree of purity of welding wire steel directly influences the broken end in drawing process for not annealed direct drawing
Rate.Drawing production to ensure in welding wire process is smoothed out, and improves the yield rate of welding wire, it is desirable that the total oxygen of welding wire steel contains
It measures low.Meanwhile to ensure that face of weld quality is beautiful after welding wire welding, it is desirable that there is certain sulfur content in welding wire.
Currently, basicity of slag can only be refined by raising, reduce refining slag oxidizing to realize by reducing total oxygen content, but it is high-alkali
Degree, the desulphurizing ability of low oxidative refining slag are stronger.Domestic and international iron and steel enterprise is to ensure that welding wire steel inclusion is maximum
Plasticizing generally uses low alkalinity (1.5~2.2) refining slag system.But it is in the actual production process, complete to pursue the molten steel after refining
Oxygen content is kept low, and refining basicity of slag still needs to control according to the middle upper limit.Therefore, in LF refining furnace reducing atmosphere
Under, low alkalinity refining slag system pattern desulphurizing ability is still relatively strong, causes the molten steel sulfur content after refining relatively low.
For most steel grades, sulphur is the harmful element in steel, therefore, desulfurization be steel-making basic task it
One.To meet the needs of a variety of unrefined steel grades, more block converter manufacturing enterprises are all by the sulfur content of blast fumance molten iron according to low
Sulphur steel grade enters the requirement control of stove molten iron, accomplishes that sulfur content is minimum as possible.In the case, it is conformed to for guarantee molten steel sulfur content
It asks, sulfur-iron alloy or feeding sulphur iron wire need to be added.And in order to promote the degree of purity of molten steel to greatest extent, the molten steel after refining is wanted
Certain soft blow time is asked, since refining slag sulfur capacity is higher, the element sulphur being added during soft blow is easy to be refined slag
Removing causes sulfur content in finished product to fluctuate.
By recycling slag with addition of molten iron pre-desulfurization product or the refining of LF stoves, i.e., by steel scrap and molten iron pre-desulfurization product or recycling
Furnace bottom is added in slag together, can also increase smelting molten steel final sulfur content.But this method shortcoming is：CaO base sulfur methods
Contain CaF in desulfurization product, corrodes furnace lining after being added in stove；Mg base doctor treatment desulfurization product yield is few, cannot meet high-volume
Welding wire steel grade is smelted to need；Refining recycling slag sulfur content (0.4% or so) is low, and is easy dusting.
Invention content
The purpose of the present invention is to provide a kind of methods that welding wire steel increases sulphur.The method that welding wire steel provided by the invention increases sulphur
It is easy to operate, it can effectively increase sulphur, and the stability of sulfur content can be improved.
A kind of method for increasing sulphur the present invention provides welding wire steel is contained with High sulfur iron ore instead of low-sulfur in converter smelting
For iron cold burden as iron content cold burden, the sulfur content of the High sulfur iron ore is 0.85wt% or more, while adding slag material, described to make
Slag charge includes lime and magnesium ball.
Preferably, the high-sulfur is Hainan lump ore containing iron ore material.
Preferably, the calculation formula of the addition of Hainan lump ore is as shown in formula I
Wherein, MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
MSlagConverter quantity of slag mean value when for Hainan lump ore is not used；
MTapConverter tapping quantity mean value when for Hainan lump ore is not used；
R is that converter smelting endpoint basicity of slag controls mean value；
η1For the recovery rate of ferro element in former iron content cold burden；
η2For the recovery rate of ferro element in the lump ore of Hainan；
S1Converter smelting endpoint molten steel sulfur content mean value when for Hainan lump ore is not used；
S2For converter smelting endpoint molten steel sulfur content desired value；
S3Sulfur content mean value in converter smelting endpoint slag when for Hainan lump ore is not used；
S4Required sulfur content in slag when reaching desired value for converter smelting endpoint molten steel sulfur content；
S5For sulfur content in former iron content cold burden；
S6For sulfur content in the lump ore of Hainan；
S7For sulfur content in lime；
B1For SiO in former iron content cold burden2Content mean value；
B2For SiO in the lump ore of Hainan2Content mean value；
P1For all iron content mean value in former iron content cold burden；
P2For all iron content mean value in the lump ore of Hainan.
Preferably, the calculation formula of the additional amount of the lime is as shown in formula II
Wherein, MLime additional amountThe additional amount of lime when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
C is the content of CaO in lime；
R is that converter smelting endpoint basicity of slag controls mean value；
B1For SiO in former iron content cold burden2Content mean value；
B2For SiO in the lump ore of Hainan2Content mean value；
B3For SiO in lime2Content mean value.
Preferably, the calculation formula of the additional amount of the magnesium ball is as shown in formula III
Wherein, MMagnesium ball additional amountThe additional amount of magnesium ball when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
MLime additional amountThe additional amount of lime when to use Hainan lump ore；
P1For all iron content mean value in former iron content cold burden；
P2For all iron content mean value in the lump ore of Hainan；
m1For the control mean value of MgO in converter smelting endpoint slag；
m2For the content of MgO in magnesium ball.
Preferably, the relationship of the cooling effect of Hainan lump ore, lime and magnesium ball and the cooling effect of former iron content cold burden
Meet formula IV
Wherein, MLime additional amountThe additional amount of lime when to use Hainan lump ore；
MMagnesium ball additional amountThe additional amount of magnesium ball when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
λ1For the cooling effect scaled value of former iron content cold burden and lime；
λ2For the cooling effect scaled value of Hainan lump ore and lime.
Preferably, the cooling effect of Hainan lump ore, lime and magnesium ball and the cooling effect difference of former iron content cold burden generate
Heat affluence be adjusted by adding Hainan lump ore.
Preferably, the low-sulfur iron content cold burden includes PB lump ores, South Africa lump ore, sinter and one kind or more in pellet
Kind.
A kind of method for increasing sulphur the present invention provides welding wire steel is contained with High sulfur iron ore instead of low-sulfur in converter smelting
For iron cold burden as iron content cold burden, the sulfur content of the High sulfur iron ore is 0.85wt% or more, while adding slag material, described to make
Slag charge includes lime and magnesium ball.The present invention utilizes the technical principle of slag-molten steel low-sulfur distribution ratio under converter oxidizing atmosphere, smelts
It replaces low-sulfur iron content cold burden as iron content cold burden by the High sulfur iron ore of 0.85wt% or more using sulfur content in the process, turns meeting
Under the premise of stove smelting is thermally equilibrated, sulfur content in converter smelting system is improved, while improving sulfur content in refining slag, reduces refining
The sulfur capacity of slag increases sulphur instead of sulphur line or sulphur iron, sulfur content is made to obtain stablizing control to reduce the removing amount of sulphur during soft blow
System.The experimental results showed that welding wire steel provided by the invention increases the method for sulphur, converter smelting thermal balance disclosure satisfy that, and after refining
Molten steel sulfur content is stablized in 0.009~0.017wt%, meets finished product control and requires.
Specific implementation mode
A kind of method for increasing sulphur the present invention provides welding wire steel is contained with High sulfur iron ore instead of low-sulfur in converter smelting
For iron cold burden as iron content cold burden, the sulfur content of the High sulfur iron ore is 0.85wt% or more, while adding slag material, described to make
Slag charge includes lime and magnesium ball.
The present invention replaces low-sulfur iron content cold burden as iron content cold burden, the sulfur content of the High sulfur iron ore using High sulfur iron ore
For 0.85wt% or more, preferably 0.85~1.1wt%, more preferably 0.9~1.1wt%.In the present invention, the high-sulfur contains
Iron ore material is preferably Hainan lump ore.In the present invention, the ingredient of Hainan lump ore is preferably as shown in table 1.In the present invention, institute
The sulfur content for stating Hainan lump ore is higher, in the quantity of slag generated after unit mass iron in ore element reduction sulfur content reach 2% with
On；Phosphorus content is low in the lump ore of Hainan simultaneously, and advantageous effect is played to converter smelting dephosphorization.
1 Hainan lump ore ingredient of table
| TFe% | SiO2% | S% | P% | Al2O3+TiO2+ MnO etc. |
| 50.02~57.32 | 10.67~15.07 | 0.85~1.10 | 0.016~0.027 | Surplus |
The present invention does not have special restriction, use well known to those skilled in the art the type of the low-sulfur iron content cold burden
Iron content cold burden for converter smelting.In the present invention, the low-sulfur iron content cold burden includes PB lump ores, South Africa lump ore, burns
It ties one or more in mine and pellet.
The present invention restriction not special to the operation of the smelting of the welding wire steel, use are well known to those skilled in the art
The technical solution of welding wire steel converter smelting.The present invention preferably according to existing welding wire steel production material condition, charging system,
Slagging regime and terminal system determine the addition of Hainan lump ore.
In the present invention, the calculation formula of the addition of Hainan lump ore is preferably as shown in formula I
Wherein, MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
MSlagConverter quantity of slag mean value when for Hainan lump ore is not used；
MTapConverter tapping quantity mean value when for Hainan lump ore is not used；
R is that converter smelting endpoint basicity of slag controls mean value；
η1For the recovery rate of ferro element in former iron content cold burden；
η2For the recovery rate of ferro element in the lump ore of Hainan；
S1Converter smelting endpoint molten steel sulfur content mean value when for Hainan lump ore is not used；
S2For converter smelting endpoint molten steel sulfur content desired value；
S3Sulfur content mean value in converter smelting endpoint slag when for Hainan lump ore is not used；
S4Required sulfur content in slag when reaching desired value for converter smelting endpoint molten steel sulfur content；
S5For sulfur content in former iron content cold burden；
S6For sulfur content in the lump ore of Hainan；
S7For sulfur content in lime；
B1For SiO in former iron content cold burden2Content mean value；
B2For SiO in the lump ore of Hainan2Content mean value；
P1For all iron content mean value in former iron content cold burden；
P2For all iron content mean value in the lump ore of Hainan.
Addition M of the present invention to the former iron content cold burdenFormer iron content cold burden, be not used Hainan lump ore when converter tapping quantity mean value
MTap, converter smelting endpoint basicity of slag control mean value R, in former iron content cold burden ferro element recovery rate η1, iron member in the lump ore of Hainan
The recovery rate η of element2, converter smelting endpoint molten steel sulfur content mean value S when Hainan lump ore is not used1, be not used Hainan lump ore when converter
Sulfur content mean value S in smelting endpoint slag3, sulfur content S in former iron content cold burden5, sulfur content S in the lump ore of Hainan6, sulfur content in lime
S7, SiO in former iron content cold burden2Content mean value B1；SiO in the lump ore of Hainan2Content mean value B2, all iron content mean value in former iron content cold burden
P1, all iron content mean value P in the lump ore of Hainan2The not special restriction of selection, according to production raw materials used and in the prior art
Situation is determined.
The converter quantity of slag mean value M when present invention is to unused Hainan lump oreSlagComputational methods there is no special restriction, root
It is calculated according to the computational methods of this field routine.In the present invention, the MSlagIt is preferred that according to the manganese in raw material balance into
Row calculates.
The present invention is to the converter smelting endpoint molten steel sulfur content desired value S2It is reached with converter smelting endpoint molten steel sulfur content
To required sulfur content S in slag when desired value4Method there is no special restriction, contained according to sulphur well known to those skilled in the art
Amount computational methods are determined.
In the present invention, the S2Determination preferably include following steps：Establish refining slag desulfurization degree ηs% and refining slag alkali
Spend the equation of linear regression of R and FeO content Fs eO% 1. ηs%=α1+β1×R-ξ1× FeO%, α1、β1And ξ1For constant；According to
1. the equation of linear regression calculates refining slag desulfurization degree ηs%；According to the refining slag desulfurization degree ηsAfter % and refining in molten steel
Sulfur content desired value calculates S2。
The present invention preferably establishes refining slag desulfurization degree ηsThe linear regression side of % and refining basicity of slag R and FeO content F eO%
Journey 1. ηs%=α1+β1×R-ξ1× FeO%, α1、β1And ξ1For constant.1. side that the present invention establishes the equation of linear regression
Method does not have special restriction, is established using Data Analysis Software well known to those skilled in the art.In the present invention, described
The foundation of equation of linear regression 1. is preferably based on existing welding wire steel raw materials for production condition, charging system, slagging regime and terminal system
Degree.
After obtaining equation of linear regression 1., 1. the present invention preferably calculates refining slag desulfurization degree according to the equation of linear regression
ηs%.The present invention to the equation of linear regression 1. in R and FeO% value the not special restriction of selection, using this
Method known to field technology personnel is adjusted according to raw materials used.
In the present invention, the S4Determination preferably include following steps：Establish vessel slag sulphur content distribution coefficient LsWith converter smelting
Refine the equation of linear regression of terminal basicity of slag R and FeO content F eO% 2. Ls=α2+β2×R-ξ2× FeO%, α2、β2And ξ2It is normal
Number；L is 2. calculated according to the equation of linear regressions；According to the LsS is calculated with converter smelting endpoint slag distribution coefficient formula4。
The present invention preferably establishes vessel slag sulphur content distribution coefficient LsWith converter smelting endpoint basicity of slag R and FeO content F eO%'s
Equation of linear regression 2. Ls=α2+β2×R-ξ2× FeO%, α2、β2And ξ2For constant.The present invention to the equation of linear regression 2.
The method of foundation does not have special restriction, is established using Data Analysis Software well known to those skilled in the art.In this hair
In bright, the foundation of the equation of linear regression 2. is preferably based on existing welding wire steel raw materials for production condition, charging system, slagging regime
With terminal system.
After obtaining equation of linear regression 2., 2. the present invention preferably calculates L according to the equation of linear regressions.In the present invention
To the equation of linear regression 2. in R and FeO% value the not special restriction of selection, it is ripe using those skilled in the art
The method known is adjusted according to raw materials used.
Obtain LsAfterwards, the present invention is preferably according to the LsS is calculated with converter smelting endpoint slag distribution coefficient formula4.In the present invention
In, it is preferably formula V to the converter smelting endpoint slag distribution coefficient formula
Wherein, (S) % is sulfur content in converter smelting endpoint slag, and [S] % is sulfur content in converter smelting endpoint molten steel.
In the present invention, the value of (S) % is S in the formula V4。
In the present invention, the former iron content cold burden is preferably low-sulfur iron content cold burden, more preferably PB lump ores.In the present invention
In, the ingredient of the PB lump ores is preferably such as table 2.
Table 2PB lump ore ingredients
| TFe% | SiO2% | S% | P% | Al2O3+TiO2+ MnO etc. |
| 60.05~63.31 | 1.94~5.11 | 0.018~0.028 | 0.063~0.115 | Surplus |
Method provided by the invention adds slag material in the converter smelting, and the slag material preferably includes lime and magnesium
Ball.In the present invention, due to Hainan lump ore silicone content height, the lime adds the basicity that can ensure finishing slag；The magnesium ball
Add the content of MgO that can ensure in slag.
The present invention preferably according to existing welding wire steel production material condition, charging system, slagging regime and terminal system with
And the addition of Hainan lump ore determines the additional amount of lime and magnesium ball.In the present invention, the calculation formula of the additional amount of lime is excellent
Choosing is as shown in formula II
Wherein, MLime additional amountThe additional amount of lime when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
C is the content of CaO in lime；
R is that converter smelting endpoint basicity of slag controls mean value；
B1For SiO in former iron content cold burden2Content mean value；
B2For SiO in the lump ore of Hainan2Content mean value；
B3For SiO in lime2Content mean value.
The present invention does not have special restriction to the white ash composition, and converter is used for using well known to those skilled in the art
The lime of smelting.In the present invention, the white ash composition is preferably such as table 3.
3 lime ingredient of table
| CaO% | SiO2 | MgO% | S% | Impurity |
| 89.36~94.66 | 0.64~1.21 | 0.98~2.23 | 0.019~0.028 | Surplus |
In the present invention, the calculation formula of the additional amount of the magnesium ball is as shown in formula III
Wherein, MMagnesium ball additional amountThe additional amount of magnesium ball when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
MLime additional amountThe additional amount of lime when to use Hainan lump ore；
P1For all iron content mean value in former iron content cold burden；
P2For all iron content mean value in the lump ore of Hainan；
m1For the control mean value of MgO in converter smelting endpoint slag；
m2For the content of MgO in magnesium ball.
Control mean value m of the present invention to MgO in the converter smelting endpoint slag1With the content m of MgO in magnesium ball2Selection do not have
There is special restriction, is selected according to raw material in the prior art and production status.
The present invention does not have special restriction to the ingredient of the magnesium ball, and converter is used for using well known to those skilled in the art
The magnesium ball of smelting.In the present invention, the white ash composition is preferably such as table 4.
4 magnesium ball ingredient of table
| MgO% | SiO2% | Impurity |
| 60.01~65.07 | 3.08~5.72 | Surplus |
In the present invention, the cooling effect of Hainan lump ore, lime and magnesium ball and the cooling effect of former iron content cold burden
Relationship preferably satisfies formula IV
Wherein, MLime additional amountThe additional amount of lime when to use Hainan lump ore；
MMagnesium ball additional amountThe additional amount of magnesium ball when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
λ1For the cooling effect scaled value of former iron content cold burden and lime；
λ2For the cooling effect scaled value of Hainan lump ore and lime.
In the present invention, the cooling effect of the magnesium ball is preferably identical as the cooling effect of lime.The present invention is to the λ1
And λ2The not special restriction of selection, be determined according to raw material in the prior art.In the present invention, the λ1It is excellent
It is selected as 3.8~4.2；The λ2Preferably 2.8~3.2.
In the present invention, when in the formula IV cooling effect of Hainan lump ore, lime and magnesium ball and former iron content cold burden it is cold
But when the ratio of effect is less than 1, the cooling effect of Hainan lump ore, lime and magnesium ball and the cooling effect of former iron content cold burden produce
Raw heat affluence is preferably adjusted by adding Hainan lump ore.The present invention does not have the determination of the additional amount of Hainan lump ore
There is special restriction, method for determination of amount is added using iron content cold burden well known to those skilled in the art.
In order to further illustrate the present invention, the method for increasing sulphur to welding wire steel provided by the invention with reference to embodiment carries out
It describes in detail, but they cannot be interpreted as limiting the scope of the present invention.
Comparative example:
Converter charge weight is 88t, and wherein iron water amount is 84t, steel scrap amount is 4t；
It is 3.2~3.8t, mean value 3.5t that smelting process chill material, which uses PB lump ores, addition,；
Slag material type is lime, magnesium ball, unprocessed dolomite, wherein lime addition is 3034~3690kg, and mean value is
3280kg, magnesium ball 410~492kg of addition, mean value 451kg, unprocessed dolomite addition are 1558~2050kg, and mean value is
1886kg；
Enter stove molten iron actual constituent：S contents be 0.015~0.025%, mean value 0.020%, P content be 0.130~
0.150%, mean value 0.140；Si contents are 0.20~0.40%, mean value 0.30%；
Steel scrap type is frivolous steel scrap, and S contents are 0.015~0.025%, mean value 0.021%；
Smelting endpoint C content is 0.04~0.05%, mean value 0.045%, and P content is 0.012~0.018%, mean value
It is 0.009~0.021% for 0.015%, S contents, mean value 0.016%；Temperature is 1605~1620 DEG C, 1610 DEG C of mean value；
Converter final slag composition：CaO content is 29.52~35.80%, mean value 32.46%；SiO2Content be 7.91~
10.73%, mean value 9.58%；Content of MgO is 6.58~8.41%, mean value 7.43%；FeO contents are 16~25%,
It is 0.029~0.052% that value, which is 20%, S contents, mean value 0.040%；Basicity R is 2.78~3.23, mean value 3.0；LsFor
2.13~2.85, mean value 2.5；
It is 1.78~2.20 to refine basicity of slag R, mean value 2.0；FeO contents are 0.60~0.86%, mean value 0.75%,
Desulfurization degree ηs% is 64.54~79.17%, mean value 71.84%；
The above-mentioned data of this comparative example are the range and mean value of more heat data, and SPASS is utilized by above-mentioned multi-group data
1. the equation of linear regression that software obtains is：ηs%=16.06+30.53 × R-6.81 × FeO%；
2. the equation of linear regression obtained using SPASS softwares is：Ls=1.36+0.80 × R-0.063 × FeO%.
Embodiment 1:
M is calculated according to manganese equilbristatSlagFor 8.5t；
Refining slag target basicity is that 2.0, FeO% target contents are 0.75%, and S contents consider according to 0.012% after refining,
S is 1. obtained in conjunction with equation of linear regression2It is 0.045%；
Converter terminal target basicity is that 3.0, FeO% target contents are 20%, and finishing slag is 2. obtained in conjunction with equation of linear regression
Ls is 2.5；S is obtained according to formula V4It is 0.113%.
According to the prior art in comparative example, existing chill material PB lump ores are replaced with into Hainan lump ore, according to formula I, formula II
It is calculated with formula III：Because magnesium ball addition is less, only consider that Hainan lump ore, lime bring the quantity of slag and S into for ease of calculating
Measure the influence to S contents in basicity of slag, slag；
MFormer iron content cold burdenFor 3.5t；MSlagFor for 8.5t；MTapFor 81t；R is that converter smelting endpoint basicity of slag controls mean value, according to
3.0 considering；η1For the recovery rate of ferro element in former iron content cold burden, consider according to 65%；η2For receiving for Hainan lump ore ferro element
Rate considers according to 65%；S1Converter smelting endpoint molten steel S content mean values when for Hainan lump ore is not used, are examined according to 0.016%
Consider；S3Converter smelting endpoint slag S content mean values when for Hainan lump ore is not used consider according to 0.040%；S5For former iron content cold burden
Middle S contents consider according to 0.024%；S6For S contents in the lump ore of Hainan, consider according to for 0.98%；S7Contain for S% in lime
Amount considers according to 0.019%；C is CaO content in lime, is considered according to 91.53%；B1For SiO in former iron content cold burden2Content is equal
Value considers according to 3.02%；B2For SiO in the lump ore of Hainan2Content considers according to 14.47%；B3For SiO in lime2Content is pressed
Consider according to 0.085%；P1For all iron content in former iron content cold burden, consider according to 61.76%；P2For all iron content in the lump ore of Hainan,
Consider according to 53.64%；m1Mean value is controlled for MgO in converter smelting endpoint slag, is considered according to 7.43%；m2MgO contains in magnesium ball
Amount considers according to consideration 64%；
It can be calculated by formula I, formula II and formula III：The addition of Hainan lump ore is：3283kg, the additional amount of lime
For：1215kg；The additional amount of magnesium ball is：163kg.
According to iron content cold burden variable quantity before and after adjustment, lime, the additional additional amount of magnesium ball dosage, and combine each coolant with
Cooling effect conversion relation between lime, which calculates, influences converter system thermal balance：
λ1Take 4.0；λ2Take 3.0；It show that ratio is 0.33 by formula IV, meets the requirements.The rich part of heat uses Hainan block
Mine adjusts：The amount of being actually added into of Hainan lump ore is 3436kg.
Enter stove molten iron actual constituent：S contents are 0.022%, P content 0.140%, and Si contents are 0.30%；
Steel scrap type is frivolous steel scrap, and S contents are 0.020%；
Smelting endpoint C content is 0.045%, P content 0.015%, and S contents are 0.045%, and temperature is 1610 DEG C；
Converter finishing slag CaO content is 32.47%；SiO2Content is 10.82%；Content of MgO is 7.40%；R 3.0；FeO
Content is that 20%, S contents are 0.112%；
It is 2.03 to refine basicity of slag R；FeO contents are 0.75%；Soft blow time 14min；Molten steel S contents are after refining
0.013%.
Embodiment 2:
Converter charge weight is 88t, and wherein iron water amount is 84t, steel scrap amount is 4t；
Hainan lump ore addition 3130kg, the additional additional amount 1150kg of lime, the additional amount 170kg of magnesium ball；
Enter stove molten iron actual constituent：S contents are 0.017%, P content 0.127%, and Si contents are 0.19%；
Steel scrap type is frivolous steel scrap, and S contents are 0.015%；
Smelting endpoint C content is 0.04%, P content 0.011%, and S contents are 0.031%, 1607 DEG C of temperature；
Converter finishing slag CaO content is 29.72%, SiO2Content is 9.97%, content of MgO 6.48%, and basicity R is
2.98, FeO contents are that 16%, S contents are 0.085%；
It is 0.60% that refining basicity of slag R, which is 1.97, FeO contents, soft blow time 13min；Molten steel S contents are after refining
0.009%.
Embodiment 3:
Converter charge weight is 88t, and wherein iron water amount is 84t, steel scrap amount is 4t；
Hainan lump ore addition 3680kg, the additional amount 1330kg of lime, the additional amount 250kg of magnesium ball；
Enter stove molten iron actual constituent：S contents are 0.029%, P content 0.153%, and Si contents are 0.43%；
Steel scrap type is frivolous steel scrap, and S contents are 0.029%；
Smelting endpoint C content is 0.05%, P content 0.017%, and S contents are 0.056%, and temperature is 1618 DEG C；
Converter finishing slag CaO content is 35.50%, SiO2Content is 11.26%, content of MgO 8.32%, and basicity R is
3.15, FeO contents are that 25%, S contents are 0.133%；
It is 0.85% that refining basicity of slag R, which is 1.85, FeO contents, and soft blow time 15min, molten steel S contents are after refining
0.017%.
As can be seen from the above embodiments, the method for welding wire steel increasing sulphur provided by the invention disclosure satisfy that converter smelting heat is flat
Weighing apparatus, and molten steel sulfur content is controlled substantially in 0.009~0.017wt% after refining, is met finished product control and is required.
The above is only a preferred embodiment of the present invention, it is not intended to limit the present invention in any form.It should
It points out, for those skilled in the art, without departing from the principle of the present invention, if can also make
Dry improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of method that welding wire steel increases sulphur, which is characterized in that in converter smelting, replace low-sulfur iron content cold with High sulfur iron ore
Material is used as iron content cold burden, and the sulfur content of the High sulfur iron ore is 0.85wt% or more；Add slag material, the slag material simultaneously
Including lime and magnesium ball；
The high-sulfur is Hainan lump ore containing iron ore material；The calculation formula of the addition of Hainan lump ore is as shown in formula I
Wherein, MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
MSlagConverter quantity of slag mean value when for Hainan lump ore is not used；
MTapConverter tapping quantity mean value when for Hainan lump ore is not used；
R is that converter smelting endpoint basicity of slag controls mean value；
η1For the recovery rate of ferro element in former iron content cold burden；
η2For the recovery rate of ferro element in the lump ore of Hainan；
S1Converter smelting endpoint molten steel sulfur content mean value when for Hainan lump ore is not used；
S2For converter smelting endpoint molten steel sulfur content desired value；
S3Sulfur content mean value in converter smelting endpoint slag when for Hainan lump ore is not used；
S4Required sulfur content in slag when reaching desired value for converter smelting endpoint molten steel sulfur content；
S5For sulfur content in former iron content cold burden；
S6For sulfur content in the lump ore of Hainan；
S7For sulfur content in lime；
B1For SiO in former iron content cold burden2Content mean value；
B2For SiO in the lump ore of Hainan2Content mean value；
P1For all iron content mean value in former iron content cold burden；
P2For all iron content mean value in the lump ore of Hainan.
2. according to the method described in claim 1, it is characterized in that, the calculation formula of the additional amount of the lime is as shown in formula II
Wherein, MLime additional amountThe additional amount of lime when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
C is the content of CaO in lime；
R is that converter smelting endpoint basicity of slag controls mean value；
B1For SiO in former iron content cold burden2Content mean value；
B2For SiO in the lump ore of Hainan2Content mean value；
B3For SiO in lime2Content mean value.
3. according to the method described in claim 1, it is characterized in that, the calculation formula of the additional amount of the magnesium ball is as shown in formula III
Wherein, MMagnesium ball additional amountThe additional amount of magnesium ball when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
MLime additional amountThe additional amount of lime when to use Hainan lump ore；
P1For all iron content mean value in former iron content cold burden；
P2For all iron content mean value in the lump ore of Hainan；
m1For the control mean value of MgO in converter smelting endpoint slag；
m2For the content of MgO in magnesium ball.
4. according to the method described in claim 1, it is characterized in that, the cooling effect of Hainan lump ore, lime and magnesium ball with
The relationship of the cooling effect of former iron content cold burden meets formula IV
Wherein, MLime additional amountThe additional amount of lime when to use Hainan lump ore；
MMagnesium ball additional amountThe additional amount of magnesium ball when to use Hainan lump ore；
MHainan lump oreFor the addition of Hainan lump ore；
MFormer iron content cold burdenFor the addition of former iron content cold burden；
λ1For the cooling effect scaled value of former iron content cold burden and lime；
λ2For the cooling effect scaled value of Hainan lump ore and lime.
5. according to the method described in claim 4, it is characterized in that, the cooling effect of Hainan lump ore, lime and magnesium ball with
The heat affluence that the cooling effect difference of former iron content cold burden generates is adjusted by adding Hainan lump ore.
6. according to the method described in claim 1, it is characterized in that, the low-sulfur iron content cold burden include PB lump ores, South Africa lump ore,
It is one or more in sinter and pellet.
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