CN101775452A - Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron - Google Patents
Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron Download PDFInfo
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- CN101775452A CN101775452A CN201010103839A CN201010103839A CN101775452A CN 101775452 A CN101775452 A CN 101775452A CN 201010103839 A CN201010103839 A CN 201010103839A CN 201010103839 A CN201010103839 A CN 201010103839A CN 101775452 A CN101775452 A CN 101775452A
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- 229910000805 Pig iron Inorganic materials 0.000 title claims abstract description 62
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 60
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000010703 silicon Substances 0.000 title claims abstract description 59
- 239000010936 titanium Substances 0.000 title claims abstract description 49
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000003723 Smelting Methods 0.000 title claims abstract description 32
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 32
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 239000011593 sulfur Substances 0.000 title claims abstract description 28
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000011081 inoculation Methods 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 110
- 229910052742 iron Inorganic materials 0.000 claims description 52
- 239000002667 nucleating agent Substances 0.000 claims description 51
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 26
- 239000003513 alkali Substances 0.000 claims description 25
- 238000005266 casting Methods 0.000 claims description 22
- 229910002804 graphite Inorganic materials 0.000 claims description 20
- 239000010439 graphite Substances 0.000 claims description 20
- 229910000519 Ferrosilicon Inorganic materials 0.000 claims description 16
- 239000011572 manganese Substances 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 12
- 239000005864 Sulphur Substances 0.000 claims description 11
- 239000004615 ingredient Substances 0.000 claims description 8
- 238000005453 pelletization Methods 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 7
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910052748 manganese Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 238000005304 joining Methods 0.000 claims description 3
- 239000003758 nuclear fuel Substances 0.000 abstract description 2
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 238000005507 spraying Methods 0.000 abstract 2
- MHKWSJBPFXBFMX-UHFFFAOYSA-N iron magnesium Chemical compound [Mg].[Fe] MHKWSJBPFXBFMX-UHFFFAOYSA-N 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 8
- 239000000203 mixture Substances 0.000 description 7
- 229910000600 Ba alloy Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 230000002087 whitening effect Effects 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- APGROBRHKCQTIA-UHFFFAOYSA-N [Mg].[Si].[Fe] Chemical compound [Mg].[Si].[Fe] APGROBRHKCQTIA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- LVJIUWYFPCLBIP-UHFFFAOYSA-N [Mg].[Ti].[Fe] Chemical compound [Mg].[Ti].[Fe] LVJIUWYFPCLBIP-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- SMDQFHZIWNYSMR-UHFFFAOYSA-N sulfanylidenemagnesium Chemical compound S=[Mg] SMDQFHZIWNYSMR-UHFFFAOYSA-N 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron, belonging to the technical filed of steel making, and used for solving the problem of stably producing the ultra-low sulfur, silicon and titanium grey nodular cast iron by a blast furnace with the pig iron. The method comprises the following steps: a, blast furnace raw material selection; b, low silicon smelting; c, stokehole silicon addition; d, stokehole desulfuration treatment; e, nitrogen spraying and stirring; and f, pig machine inoculation. The invention utilizes the treatment techniques of blast furnace raw material selection, low silicon smelting, stokehole silicon addition, stokehole desulfuration treatment, nitrogen spraying and stirring and pig machine inoculation, thus solving the technical problem of problem of stably producing ultra-low sulfur, silicon and titanium grey nodular cast iron by the blast furnace with the pig iron. The product realizes not only low Si, low Ti and super low S but also gray, and is particularly suitable for producing large-scale cast ferritic nodular cast iron and large-scale high grade nodular iron pieces such as containers for wind power generation and nuclear fuel storage, and the like, thus filling the gap of the products of the type.
Description
Technical field
The present invention relates to a kind of pig iron and smelting process, particularly blast furnace and smelt the smelting process of ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron indirectly, belong to technical field of ferrous metallurgy.
Background technology
At present, if in the blast furnace direct production, even [C], [Si] in the pig iron, [Mn], [P], [Ti] element are qualified, [S] element is difficult to also that all qualified more difficult realizations are ultralow for the low titanium ash of the extremely strict low silicon of specification of quality mouthful nodular pig iron.[Si] is low to represent furnace temperature low, and then [S] height then need improve basicity of slag if realize ultralow [S], certainly will influence furnace condition anterograde, and is difficult to realize section ash mouth.It is low that the pig iron contains [Si], easily produces cementite, causes the whitening aggravation, the downstream user casting quality caused have a strong impact on.Theoretically, [Si]＜0.50% o'clock spoken parts in traditional operas can occur, thereby in the low silicon ash mouthful technical difficulty that exists of nodular pig iron of blast furnace direct production super low sulfur.Require low titanium for the wind-powered electricity generation foundry goods with the spheroidal graphite pig iron, for making [Ti] qualified necessary low silicon smelting in the pig iron, the back contains the necessary stokehole silicon addition of [Si] requirement for satisfying the pig iron but low silicon taps a blast furnace, and adopts the existing back stokehole silicon addition technology of tapping a blast furnace merely to have the uneven problem of silicon content.There is test to show that 60 tons of iron ladle silicon content composition differences are 0.10-0.25%, and strengthens gradually along with increasing silicon amount raising composition difference.Obviously, this is for the strict nodular pig iron of production uniformity coefficient, the wind-powered electricity generation foundry goods spheroidal graphite pig iron particularly, and its constant product quality is difficult to guarantee.In addition,, generally adopt the hot metal pretreatment station to carry out the method for blast-melted secondary desulfurization at present, its objective is to steel-making and prepare, have shortcomings such as facility investment is big, floor space is big for realizing super low sulfur.This technology is for producing ultra-low sulfur, silicon and titanium grey mouth nodular pig iron and being not suitable for.
Summary of the invention
The present invention is intended to solve the defective of prior art and provides a kind of cast iron product of realizing to hang down the smelting process of the ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron of silicon, low titanium, super low sulfur and assurance ash mouthization.
The alleged problem of the present invention is solved by following technical scheme:
A kind of smelting process of ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron, its special feature is: the chemical ingredients of described ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron is as follows: carbon [C] 4.300-4.600%, silicon [Si] 0.400-0.600%, manganese [Mn] 0.060-0.100%, phosphorus [P]≤0.030%, sulphur [S]≤0.010%, titanium [Ti]≤0.032%, surplus [Fe], described method comprises the steps:
A. blast furnace raw material is selected for use: blast furnace raw material consists of: the high-alkali agglomerate 65-70% of the spheroidal graphite pig iron, and spheroidal graphite pig iron pelletizing 30-35%, the basicity of the high-alkali agglomerate of the described spheroidal graphite pig iron is 1.90-2.00;
B. low silicon smelting: blast-furnace smelting [Si] control 0.15-0.35%, R
2Control 1.15-1.20;
C. stokehole silicon addition: whenever increase the amount that 0.1% [Si] adds the 1.8-2.5kg ferrosilicon powder according to the ton molten iron when tapping a blast furnace, ferrosilicon powder evenly is added on the molten iron stream;
D. stokehole desulfuration treatment: add alkali and fall sulphuring treatment when stokehold sulphur [S]＞0.010% adopts, stokehold processing industry alkali add-on is controlled at molten iron 2-4 kilogram per ton, and industrial soda adds with molten iron stream, and the joining day is controlled between the 70-80% of the time of tapping a blast furnace;
E. spray nitrogen in stokehold stirs: increase silicon and add behind the alkali by spray gun nitrogen-blow in the iron ladle molten iron, the winding-up time is 30-60 second, nitrogen gas stream pressure-controlling 500-700Kpa;
F. pig machine inoculation: the stokehold sampling detects, and according to the spoken parts in traditional operas degree, adds the nucleating agent Si-Ba alloy and carry out inoculation in the pig-casting machine trough, and innoculant adding quantity is controlled at≤the 2kg/t molten iron.
The smelting process of above-mentioned ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron, in the described pig machine inoculation step, nucleating agent is evenly added on the molten iron stream by the nucleating agent adding set, described nucleating agent adding set is separately positioned on the head and the afterbody of pig-casting machine trough side, wherein the nucleating agent of pig-casting machine trough head nucleating agent adding set interpolation is controlled at＜the 1kg/t molten iron, after adding nucleating agent, promptly sampling detects, if spoken parts in traditional operas fails to eliminate fully, then start pig-casting machine trough afterbody nucleating agent adding set and add nucleating agent once more.
The smelting process of above-mentioned ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron, described nucleating agent adding set comprises ladder, outer case, outer case is positioned on the ladder, the defeated material belt that is provided with hopper, frequency modulation motor in the outer case and drives by frequency modulation motor, defeated material belt art end bottom is provided with discharge bucket, the discharge bucket bottom connects discharge port, the terminal corresponding trough of discharge port, and the adjusting plate is established in the discharge bucket bottom.
The low silicon magnesium iron of the direct smelting low-sulfur of the blast furnace of the abandoning tradition of the present invention smelting technology of the pig iron, adopt blast furnace low silicon smelting technology, stokehole silicon addition, the stirring of stokehold spray nitrogen, stokehole desulfuration treatment and pig machine inoculation to produce ultra-low sulfur, silicon and titanium grey mouth nodular pig iron technology, solved the technical barrier of blast furnace stably manufactured ultra-low sulfur, silicon and titanium grey mouth nodular pig iron.Advantage of the present invention is: the product that adopts this method to produce belongs to the ultra-low sulfur, silicon and titanium grey mouth trade mark in the nodular pig iron, this product can be accomplished low [Si], low [Ti], ultralow [S], can realize the ash mouth again, this product is particularly suitable for the production of large-scale as-cast ferrite ductile iron and large-scale high-quality magnesium iron spares such as wind power generation, nuclear fuel storage-transport vessel, has filled up the blank of this series products.The low titanium magnesium iron of the low silicon of present technique and the direct smelting low-sulfur of blast furnace with pig iron technology compare utilization coefficient, magnesium iron than,, aspects such as ash mouth ratio, hot blast temperature are improved, and comprehensive coke ratio obviously descends.
Description of drawings
Fig. 1 is the synoptic diagram of equipment used pig-casting machine of the present invention;
Fig. 2 is a nucleating agent adding set structural representation of the present invention.
Label is expressed as follows in the accompanying drawing: 1. chain belt of pig machine; 2. trough, 3. trough afterbody nucleating agent adding set, 4. trough head nucleating agent adding set, 5. iron ladle, 6. ladder, 7. outer case, 8. frequency modulation motor, 9. hopper, 10. material feeder, 11. defeated material belt, 12. discharge buckets, 13. regulate plate, 14. discharge ports.
Embodiment
Blast furnace of the present invention is smelted the combination that is meant blast furnace low silicon smelting, stokehole silicon addition, the stirring of stokehold spray nitrogen, stokehole desulfuration treatment and pig machine inoculation indirectly.Described ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron chemical ingredients is as follows: carbon [C] 4.300-4.600%, silicon [Si] 0.400-0.600%, manganese [Mn] 0.060-0.100%, phosphorus [P]≤0.030%, sulphur [S]≤0.010%, titanium [Ti]≤0.032%, surplus [Fe].Main technical points of the present invention is embodied in following several aspect:
1, selected blast furnace raw material: blast furnace raw material consists of: the high-alkali agglomerate 65-70% of the spheroidal graphite pig iron, spheroidal graphite pig iron pelletizing 30-35%, wherein the high-alkali sinter basicity of the spheroidal graphite pig iron is controlled at 1.90-2.00.High-alkali agglomerate of described magnesium iron and magnesium iron pelletizing control criterion see attached list 1.
2, low silicon smelting guarantees furnace condition anterograde, reduces the pig iron [Ti] content: [Si] control 0.15-0.35% in the blast furnace ironmaking process, dual alkalinity R
2Be CaO/SiO
2Control 1.15-1.20, (MgO) control 11-13%, with the raising of CaO+MgO content, and CaO (or MgO) and SiO
2Or TiO
2The complex compound quantity that forms increases, and has reduced free SiO in the slag
2Content reduces Si and Ti reducing amount, thereby control [Ti]≤0.032% is realized low [Ti] requirement.
3, stokehole silicon addition is to guarantee that [Si] is at claimed range: before tapping a blast furnace ferrosilicon powder dried to water content less than 0.1%, whenever increasing the consumption that 0.1% [Si] add the 1.8-2.5kg ferrosilicon powder by molten iron per ton when tapping a blast furnace evenly is added to ferrosilicon powder on the molten iron stream, it fully is melted in the molten iron, reaches and increase the silicon purpose.The ferrosilicon powder control criterion sees attached list 2.
4, stokehole desulfuration treatment ultralow to guarantee [S]: for avoiding chilling tendency, do not adopt spray magnesium sulfur removal technology, the stokehold employing adds alkali and falls the sulphur mode.Processing industry alkali when stokehold sulphur [S]＞0.010% adds 2-4 kilogram Na according to molten iron per ton
2CO
3Add, the joining day is controlled at 80% of the time of tapping a blast furnace, is beneficial to the abundant contact reacts of industrial soda, guarantees sweetening effectiveness.Industrial soda adds with molten iron stream, when adding industrial soda in molten iron flows, requires as far as possible evenly, stablizes.
5, spray nitrogen in stokehold stirs to guarantee [Si] even: the back of tapping a blast furnace is by spray gun nitrogen-blow in the iron ladle molten iron, by the nitrogen gas stream effect, with the abundant stirring and evenly mixing of molten iron in the iron ladle, reach the purpose of full and uniform composition, solve and to increase the even problem of composition height behind the silicon.Test shows: increase silicon reach 1% promptly 60 tons of iron ladles add under the ferrosilicon 1500Kg situation, stir by stokehold nitrogen, can guarantee that still composition is even, the silicon content composition is poor＜0.105%.Winding-up time 30-60 second, nitrogen gas stream pressure-controlling 500-700Kpa.
6, pig machine inoculation is to guarantee eliminating spoken parts in traditional operas: this step is the gordian technique that the present invention eliminates pig iron white structure.Usually adding nucleating agent is to use in the castings production process, the present invention is provided with the nucleating agent adding set at pig-casting machine, in the trough of pig-casting machine, add a certain amount of nucleating agent Si-Ba alloy, the white structure in the pig iron is eliminated, obtain ultra-low sulfur, silicon and titanium grey mouth magnesium iron.
Referring to Fig. 1, for realizing that pig-casting machine adds nucleating agent, the present invention is provided with nucleating agent adding set 3,4 at the trough side of pig-casting machine, and nucleating agent adding set 4 is arranged on the head of pig-casting machine trough 2 sides, and nucleating agent adding set 3 is arranged on the afterbody of pig-casting machine trough side.According to molten iron whitening degree, can add nucleating agent once or twice.Wherein the nucleating agent of pig-casting machine trough head nucleating agent adding set 4 interpolations is controlled at＜the 1kg/t molten iron, after adding nucleating agent, make the best use of time to take a sample and detect to organize whether form the ash mouth, in particular cases fail to eliminate fully as if white structure, then start pig-casting machine trough afterbody nucleating agent adding set 3 according to the whitening degree and add nucleating agent once more, twice nucleating agent adds total amount and is no more than the 2kg/t molten iron.
Referring to Fig. 2, nucleating agent adding set 3 of the present invention is identical with 4 structure, its formation comprises ladder 6, outer case 7, outer case is positioned on the ladder, the defeated material belt 11 that is provided with hopper 9, frequency modulation motor 8 in the outer case and drives by frequency modulation motor, defeated material belt bottom is provided with discharge bucket 12, and the discharge bucket bottom connects discharge port 14, the terminal corresponding trough of discharge port, discharge bucket bottom are provided with regulates plate 13.In nucleating agent adding set when work,, hopper 9 is according to the iron water amount nucleating agent of packing into, and under the effect of material feeder 10, nucleating agent drops to defeated material belt 11, and nucleating agent is transported to discharge bucket by defeated material belt, falls uniformly on the molten iron stream through discharge port 14.Adjust the rotating speed of frequency modulation motor 8 and can adjust defeated material amount.Adjust the aperture position of regulating plate 13, can control nucleating agent and add speed.
Subordinate list 1 blast furnace raw material control criterion
| The name of an article | ??TFe??％ | ??SiO 2??％ | ??Al 2O 3??％ | ??P??％ | ??S??％ | ??TiO 2??％ | ??R 2 | ??Mn | Screening % | Rotary drum % | |
| Agglomerate (high-alkali) | ??≤5.3 | ??≤1.8 | ??≤0.015 | ??≤0.03 | ??≤0.080 | ??±0.06 | ??≤0.10 | ||||
| Pelletizing | ??≥62 | ??≤8.0 | ??≤2.0 | ??≤0.015 | ??≤0.10 | ??≤0.050 | ??≤0.4 | ??≤0.10 | ??≤5％??(≤6.3mm) | ??≥88 |
The present invention be 600m in useful volume
3The level blast furnace is directly smelted the low silicon magnesium iron of super low sulfur and is compared at utilization coefficient, magnesium iron with the pig iron and be improved than aspects such as, ash mouthful ratio, hot blast temperatures, and comprehensive coke ratio obviously descends, and its correlation data sees attached list 3.
| Sequence number | Index | Unit | ??600m 3The level blast furnace is directly smelted | ??600m 3The level blast furnace is smelted indirectly |
| ??1 | Utilization coefficient | ??t/m 3.d | ??3.43 | ??4.01 |
| ??2 | Comprehensive coke ratio | ??Kg/t | ??453 | ??431 |
| ??3 | Magnesium iron ratio up to standard | ??％ | ??16.95 | ??71.85 |
| ??4 | Ash mouthful ratio | ??％ | ??58.9 | ??100 |
| ??5 | Hot blast temperature | ??℃ | ??1155 | ??1185 |
The ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron and the prior art that adopt the technology of the present invention to produce see attached list 4 at the magnesium iron of blast furnace direct production with the contrast of pig iron chemical ingredients.
Subordinate list 4 magnesium irons contrast with pig iron chemical ingredients
| Composition (%) | ??[C] | ??[Si] | ??[Mn] | ??[P] | ??[S] | ??[Ti] |
| Blast furnace is directly smelted | ??4.20-4.50 | ??0.40-0.60 | ??0.06-0.10 | ??0.025-0.030 | ??≤0.020 | ??≤0.040 |
| The technology of the present invention | ??4.30-4.60 | ??0.40-0.60 | ??0.06-0.10 | ??0.025-0.030 | ??≤0.010 | ??≤0.032 |
Can find out that by subordinate list 4 it is higher relatively and can't all reach mouthful requirement of section ash with pig iron sulphur content directly to smelt magnesium iron at blast furnace, and the present invention adopts indirect smelting technology at blast furnace, but the magnesium iron pig iron of the ultralow sulphur content of stably manufactured, section ash mouthful.
Several embodiment below are provided:
Embodiment 1: at 600m
3The level blast-furnace smelting magnesium iron pig iron is chosen the blast furnace raw material according to subordinate list 1 standard, the wherein high-alkali agglomerate 66.61% of the spheroidal graphite pig iron, spheroidal graphite pig iron pelletizing 33.39%, and the high-alkali sinter basicity of the spheroidal graphite pig iron is controlled at 1.98; Blast-furnace smelting [Si] control 0.15-0.35%, R
2Control 1.15-1.20, control [Ti]≤0.032%; Molten iron detects that [Si] is 0.15%, [S] is 0.014%; Take by weighing ferrosilicon powder 270kg according to subordinate list 2 standards, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Processing industry alkali Na subsequently
2CO
3200kg, the back of tapping a blast furnace is by spray gun nitrogen-blow in the iron ladle molten iron, nitrogen gas stream pressure-controlling 600Kpa, 40 seconds winding-up time; Utilize pig-casting machine nucleating agent adding set 4 to add the nucleating agent Si-Ba alloy according to the 0.8kg/t molten iron, white structure all disappears after testing.Chemical ingredients is as follows after testing for this stove product (50 tons): carbon [C] 4.360%, silicon [Si] 0.450%, manganese [Mn] 0.062%, phosphorus [P] 0.024%, sulphur [S] 0.009%, titanium [Ti] 0.028%, surplus [Fe].
Embodiment 2: at 600m
3The level blast-furnace smelting magnesium iron pig iron is chosen the blast furnace raw material according to subordinate list 1 standard, the wherein high-alkali agglomerate 70% of the spheroidal graphite pig iron, spheroidal graphite pig iron pelletizing 30%, and the high-alkali sinter basicity of the spheroidal graphite pig iron is controlled at 1.95; Blast-furnace smelting [Si] control 0.15-0.35%, R
2Control 1.15-1.20, control [Ti]≤0.032%; Molten iron detects that [Si] is 0.35%, [S] is 0.011%; Take by weighing ferrosilicon powder 110kg according to subordinate list 2 standards, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Processing industry alkali Na subsequently
2CO
380kg, the back of tapping a blast furnace is by spray gun nitrogen-blow in the iron ladle molten iron, nitrogen gas stream pressure-controlling 700Kpa, 30 seconds winding-up time; Utilize pig-casting machine nucleating agent adding set 4 to add the nucleating agent Si-Ba alloy according to the 0.9kg/t molten iron, white structure all disappears after testing.Chemical ingredients is as follows after testing for this stove product (40 tons): carbon [C] 4.460%, silicon [Si] 0.460%, manganese [Mn] 0.065%, phosphorus [P] 0.025%, sulphur [S] 0.010%, titanium [Ti] 0.030%, surplus [Fe].
Embodiment 3: at 600m
3The level blast-furnace smelting magnesium iron pig iron is chosen the blast furnace raw material according to subordinate list 1 standard, the wherein high-alkali agglomerate 65% of the spheroidal graphite pig iron, spheroidal graphite pig iron pelletizing 35%, and the high-alkali sinter basicity of the spheroidal graphite pig iron is controlled at 2.00; Blast-furnace smelting [Si] control 0.15-0.35%, R
2Control 1.15-1.20, control [Ti]≤0.032%; Molten iron detects that [Si] is 0.30%, [S] is 0.015%; Take by weighing ferrosilicon powder 230kg according to subordinate list 2 standards, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Processing industry alkali Na subsequently
2CO
3_ 120kg, the back of tapping a blast furnace is by spray gun nitrogen-blow in the iron ladle molten iron, nitrogen gas stream pressure-controlling 500Kpa, 60 seconds winding-up time; Utilize pig-casting machine nucleating agent adding set 4 to add the nucleating agent Si-Ba alloy according to the 0.6kg/t molten iron, white structure fails all to disappear after testing, starts nucleating agent adding set 3 and adds the nucleating agent Si-Ba alloy once more according to the 0.7kg/t molten iron.This stove product (40 tons) chemical ingredients is as follows after testing: carbon [C] 4.580%, silicon [Si] 0.590%, manganese [Mn] 0.061%, phosphorus [P] 0.023%, sulphur [S] 0.008%, titanium [Ti] 0.032%, surplus [Fe] all is an ash mouthful tissue.
Claims (3)
1. the smelting process of a ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron, it is characterized in that: the chemical ingredients of described ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron is as follows: carbon [C] 4.300-4.600%, silicon [Si] 0.400-0.600%, manganese [Mn] 0.060-0.100%, phosphorus [P]≤0.030%, sulphur [S]≤0.010%, titanium [Ti]≤0.032%, surplus [Fe], described method comprises the steps:
A. blast furnace raw material is selected for use: blast furnace raw material consists of: the high-alkali agglomerate 65-70% of the spheroidal graphite pig iron, and spheroidal graphite pig iron pelletizing 30-35%, the basicity of the high-alkali agglomerate of the described spheroidal graphite pig iron is 1.90-2.00;
B. low silicon smelting: blast-furnace smelting [Si] control 0.15-0.35%, R
2Control 1.15-1.20;
C. stokehole silicon addition: whenever increase the amount that 0.1% [Si] adds the 1.8-2.5kg ferrosilicon powder according to the ton molten iron when tapping a blast furnace, ferrosilicon powder evenly is added on the molten iron stream;
D. stokehole desulfuration treatment: add alkali and fall sulphuring treatment when stokehold sulphur [S]＞0.010% adopts, stokehold processing industry alkali is controlled at molten iron per ton and adds the 2-4 kilogram, and industrial soda adds with molten iron stream, the joining day be controlled at the time of tapping a blast furnace 7080% between;
E. spray nitrogen in stokehold stirs: increase silicon and add behind the alkali by spray gun nitrogen-blow in the iron ladle molten iron, the winding-up time is 30-60 second, nitrogen gas stream pressure-controlling 500-700Kpa;
F. pig machine inoculation: the stokehold sampling detects, and according to the spoken parts in traditional operas degree, adds nucleating agent and carry out inoculation in the pig-casting machine trough, and innoculant adding quantity is controlled at≤the 2kg/t molten iron.
2. the smelting process of ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron according to claim 1, it is characterized in that: in the described pig machine inoculation step, nucleating agent is by nucleating agent adding set (3,4) evenly add on the molten iron stream, described nucleating agent adding set is separately positioned on the head and the afterbody of pig-casting machine trough side, wherein the nucleating agent of pig-casting machine trough head nucleating agent adding set (4) interpolation is controlled at＜the 1kg/t molten iron, after adding nucleating agent, promptly sampling detects, if can spoken parts in traditional operas do not eliminated fully, then start pig-casting machine trough afterbody nucleating agent adding set (3) and add nucleating agent once more.
3. the smelting process of ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron according to claim 2, it is characterized in that: described nucleating agent adding set comprises ladder (6), outer case (7), outer case is positioned on the ladder, the defeated material belt (11) that is provided with hopper (9), frequency modulation motor (8) in the outer case and drives by frequency modulation motor, defeated material strap end bottom is provided with discharge bucket (12), the discharge bucket bottom connects discharge port (14), the terminal corresponding trough of discharge port, discharge bucket bottom are provided with regulates plate (13).
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