CN101545019A - Method for smelting pig iron for high-silicon ultra-low-sulfur low-titanium ductile iron - Google Patents
Method for smelting pig iron for high-silicon ultra-low-sulfur low-titanium ductile iron Download PDFInfo
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Abstract
The invention relates to a method for smelting pig iron for high-silicon ultra-low-sulfur low-titanium ductile iron, which belongs to the technical field of iron and steel smelting, and is used for solving the problems in the stable production of the pig iron for the high-silicon ultra-low-sulfur low-titanium ductile iron in a blast furnace of which the volume is more than 300m<3>. The method comprises the following steps: a, blast furnace raw material selection, wherein the blast furnace raw materials comprise 70 to 90 percent of ductile iron high-alkali sintering ore and 10 to 30 percent of ductile iron pellets or lump ore, and the alkalinity of the ductile iron high-alkali sintering ore is between 1.66 and 1.86; b, low-silicon smelting, wherein blast furnace smelting [Si] is controlled to be between 0.25 and 0.45 percent and R3 is controlled to be between 1.25 and 1.35 percent; c, silicon increasing before getting into the blast furnace; and d, magnesium spraying and stirring for desulfurization before getting into the blast furnace. The method adopts a blast furnace low-silicon smelting technique and a process of silicon increasing and magnesium spraying and stirring for desulfurization before getting into the blast furnace to produce the pig iron for the high-silicon ultra-low-sulfur low-titanium ductile iron, solves the technical problems in the stable production of the pig iron for the ductile iron in the blast furnace of which the volume is more than 300m<3>, and provides a practicable technical proposal for the full release of the blast furnace capacity and the achievement of low-cost operation.
Description
Technical field
The present invention relates to a kind of pig iron and smelting process, particularly at 300m
3The above blast-furnace smelting iron for high-silicon ultra-low-sulfur low-titanium ductile of level belongs to the smelting iron and steel technical field with the smelting process of the pig iron.
Background technology
At present, be at 300m for the extremely strict nodular pig iron of specification of quality
3The following blast furnace production of level especially concentrates on 200m
3The following blast furnace production of level, its production status is: low yield, high consumption, expensive.With the development of foundary industry, output, the quality of spheroidal graphite cast iron increase substantially, the demand of high-quality nodular pig iron is increased day by day, and the 300m of mass production nodular pig iron
3The following blast furnace of level not only is difficult to produce the high-silicon ultra-low-sulfur low-titanium nodular pig iron, and owing to poor, the energy consumption height of environmental protection, quality instability, has belonged to country's project that eliminates the backward production facilities.According to current technology, at the siliceous higher nodular pig iron of blast furnace direct production, even C, Si in the pig iron, Mn, P element are qualified, Ti, S element are difficult to also that all qualified more difficult realizations are ultralow, and [Ti] improves with silicon content and sharply raise in the smelting process.It is high and [S] is low that molten iron contains [Si], if at 300m
3Level above blast furnace direct smelting certainly will cause cupola well carbon deposit, working of a furnace instability, the stokehold problems such as difficulty of tapping a blast furnace, thereby at 300m
3The technical difficulty that exists of the above blast furnace direct production high-silicon ultra-low-sulfur low-titanium nodular pig iron of level.
Since 20 end of the centurys, with the improvement of smelting condition and the progress of ironmaking technology, and high yield, low consumption, requirement cheaply, develop rapidly and use for steel-making provides the blast furnace low silicon smelting technology of molten iron; But it is less that this technology is used in the blast furnace production of the non-steel-making of smelting with the pig iron, its reason is: low silicon taps a blast furnace the back for satisfying the necessary stokehole silicon addition of silicon content in pig iron requirement, adopt 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, 60 tons of iron ladle silicon content composition differences are 0.10-0.25%, and strengthen gradually along with increasing silicon amount raising composition difference, obviously, this is for the strict nodular pig iron of production uniformity coefficient, and its constant product quality is difficult to guarantee.
In addition, the method that blast-melted secondary desulfurization is carried out at present hot metal pretreatment station of generally adopting, its objective is to steel-making and prepare, have shortcomings such as facility investment is big, floor space is big, this technology is for production super low sulfur high-quality nodular pig iron and be not suitable for.
Summary of the invention
The present invention be intended to solve the defective of prior art and provide a kind of and can fully discharge the blast furnace production capacity, realize low cost movement at 300m
3The above blast-furnace smelting iron for high-silicon ultra-low-sulfur low-titanium ductile of the level method of the pig iron.
The alleged problem of the present invention is solved by following technical scheme:
A kind of iron for high-silicon ultra-low-sulfur low-titanium ductile pig iron smelting method is 300m in useful volume
3Above blast furnace is implemented, its special feature is: its chemical ingredients of percentage composition meter is as follows by weight: C4.0-4.4%, Si1.00-2.40%, Mn0.08-0.15%, P0.035-0.045%, S≤0.010%, Ti≤0.025% with the pig iron for described iron for high-silicon ultra-low-sulfur low-titanium ductile, 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 70-90% of magnesium iron, and magnesium iron pelletizing or lump ore 10-30%, the basicity of the high-alkali agglomerate of described magnesium iron is 1.66-1.86;
B. low silicon smelting: blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35;
C. stokehole silicon addition: whenever increase the amount that 0.1% silicon adds the 1.8-3.0kg ferrosilicon powder according to the ton molten iron when tapping a blast furnace and add ferrosilicon powder;
D. stokehold spray magnesium stirring desulphurization is handled: the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jet by spray gun in the iron ladle molten iron, and the winding-up amount is whenever fallen the 0.01% sulphur 0.2-0.5kg magnesium grain of jetting, nitrogen gas stream pressure-controlling 500-700Kpa for a ton molten iron.
Above-mentioned iron for high-silicon ultra-low-sulfur low-titanium ductile pig iron smelting method, S≤0.03%, P≤0.02%, TiO in the high-alkali agglomerate composition of the magnesium iron of described blast furnace raw material
2≤ 0.10%; TiO in the magnesium iron pelletizing composition
2≤ 0.10%, P≤0.020%, S≤0.10%; TiO in the magnesium iron lump ore composition
2≤ 0.10%, P≤0.020%, S≤0.30%.
Above-mentioned iron for high-silicon ultra-low-sulfur low-titanium ductile pig iron smelting method is that ferrosilicon powder evenly is added on the molten iron stream in the described stokehole silicon addition step.
The blast furnace of abandoning tradition of the present invention is directly smelted the smelting technology of magnesium iron with the pig iron, adopts blast furnace low silicon smelting technology and stokehole silicon addition spray magnesium stirring desulphurization explained hereafter high-silicon ultra-low-sulfur low-titanium nodular pig iron, has solved 300m
3The technical barrier of the above blast furnace stably manufactured nodular pig iron of level for fully discharging the blast furnace production capacity, realizing low cost movement, provides feasible technical scheme.Advantage compared with prior art of the present invention is: 1. the product that adopts this method to produce belongs to the high-silicon ultra-low-sulfur low-titanium trade mark in the nodular pig iron, filled up the blank of this series products, 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.2. help enterprise and organize production flexibly, can use this technological development and produce the alloy special iron, thereby make the small serial production of special iron become possibility, satisfy casting user's various trade mark requirements.3. present technique and 200m
3Level blast-furnace smelting magnesium iron is compared at aspects such as utilization coefficient, magnesium iron ratio, hot blast temperatures with pig iron technology and is improved, and comprehensive coke ratio obviously descends.
Embodiment
The present invention is at 300m
3The above blast furnace of level adopts the indirect smelting technology stably manufactured iron for high-silicon ultra-low-sulfur low-titanium ductile pig iron.Described blast furnace is smelted indirectly and is meant that low silicon smelting and stokehole silicon addition and stokehold spray magnesium stirring desulphurization organically combine.Described iron for high-silicon ultra-low-sulfur low-titanium ductile is as follows with pig iron chemical ingredients: C4.0-4.4%, Si1.00-2.40%, Mn0.08-0.15%, P0.035-0.045%, S≤0.010%, Ti≤0.025%, surplus Fe.Principal feature of the present invention is embodied in following four aspects: 1, selected blast furnace raw material: blast furnace raw material consists of: the high-alkali agglomerate 70-90% of magnesium iron, magnesium iron pelletizing or lump ore 10-30%, wherein the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.66-1.86.High-alkali agglomerate of described magnesium iron and magnesium iron pelletizing or lump ore control criterion see attached list 1.2, low silicon smelting guarantees furnace condition anterograde: [Si] control 0.25-0.45% in the blast furnace ironmaking process, ternary basicity R3 i.e. (CaO+MgO)/SiO
2Control 1.25-1.35, MgO control 8-11%, with the raising of CaO+MgO content, CaO (or MgO) and SiO
2Or TiO
2The complex compound quantity that forms increases, and has reduced free SiO in the slag
2Number content, thus Si and Ti reducing amount reduced, thus control [Ti]≤0.025% is realized ultralow titanium.3, the stokehold heavy dose increases silicon to guarantee [Si]: 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 1.8-3.0kg 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, stokehold spray magnesium stirring desulphurization is handled to guarantee that [Si] is evenly and control [S] simultaneously: the back of tapping a blast furnace by spray gun with the nitrogen magnesium grain of in the iron ladle molten iron, jetting, vigorous reaction and nitrogen gas stream effect by strong reductant magnesium grain, with the abundant stirring and evenly mixing of molten iron in the iron ladle, reach the dual purpose of abundant desulfurization and even composition, realize that super low sulfur, composition are even, especially solve and 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, silicon content composition difference be＜0.105%, and average desulfurization degree is above 65%.Magnesium grain winding-up amount is that 0.01%[S whenever falls in molten iron per ton] winding-up 0.2-0.5kg magnesium grain, nitrogen gas stream pressure-controlling 500-700Kpa.Magnesium grain control criterion sees attached list 3.
Subordinate list 1 blast furnace raw material control criterion
| The name of an article | Fe ％ | FeO ％ | SiO 2 ％ | Al 2O 3 ％ | MgO ％ | Pb ％ | P ％ | Zn ％ | S ％ | (K+Na) ％ | TiO 2 ％ | R 2 | Screening % | Rotary drum % |
| Agglomerate (high-alkali) | ≥57.5 | ≤11 | ≤5.3 | ≤1.8 | 1.5 - 2.0 | ≤0.01 | ≤0.020 | ≤0.01 | ≤0.03 | ≤0.1 | ≤0.10 | 1.66-1. 86 | ≤6 | ≥76 |
| Pelletizing | ≥62 | ≤8 | ≤2.0 | ≤0.01 | ≤0.020 | ≤0.007 | ≤0.1 | ≤0.1 | ≤0.10 | ≤0.4 | ≥85 |
| Lump ore | ≥62 | ≤7 | ≤2.5 | ≤0.01 | ≤0.020 | ≤0.007 | ≤0.3 | ≤0.1 | ≤0.10 | ≤0.3 |
Subordinate list 2 ferrosilicon powder control criterions
Subordinate list 3 magnesium grain control criterions
| The name of an article | Mg/％ | Passivation (NaCl)/% | Granularity/mm |
| The magnesium grain | ≥92 | ≤8 | 0.5-1.0 |
The present invention and useful volume are 200m
3Level blast-furnace smelting magnesium iron is compared at aspects such as utilization coefficient, magnesium iron ratio, hot blast temperatures with the pig iron and is improved, and comprehensive coke ratio obviously descends, and its correlation data sees attached list 4.
Subordinate list 4 blast furnace parameter comparison
| Sequence number | Index | Unit | 200m 3The level blast furnace | 600m 3The level blast furnace |
| 1 | Utilization coefficient | t/m 3.d | 3.06 | 3.54 |
| 2 | Comprehensive coke ratio | Kg/t | 638 | 510 |
| 3 | The magnesium iron ratio | ％ | 87.07 | 98.09 |
| 4 | Hot blast temperature | ℃ | 1010 | 1180 |
The iron for high-silicon ultra-low-sulfur low-titanium ductile that adopts the technology of the present invention to produce uses the pig iron and prior art at 300m
3Following blast furnace of level and 300m
3The magnesium iron of the above blast furnace production of level sees attached list 5 with the contrast of pig iron chemical ingredients.
Subordinate list 5 magnesium irons contrast with pig iron chemical ingredients
| Composition (%) | [C] | [Si] | [Mn] | [P] | [S] | [Ti] |
| 300m 3The following blast furnace of level | 3.90-4.40 | ≥1.00 | 0.08-0.15 | 0.035-0.045 | ≤0.030 | ≤0.100 |
| 300m 3The above blast furnace of level is directly smelted | 4.00-4.40 | <1.00 | 0.08-0.15 | 0.035-0.045 | ≤0.030 | ≤0.080 |
| 300m 3The above blast furnace the technology of the present invention of level | 4.00-4.40 | 1.00-2.40 | 0.08-0.15 | 0.035-0.045 | ≤0.010 | ≤0.025 |
Can find out that by subordinate list 5 prior art is at 300m
3The following blast-furnace smelting magnesium iron of level is higher relatively with pig iron sulphur content, titaniferous amount, at 300m
3The above blast furnace of level directly smelt magnesium iron with pig iron sulphur content, the titaniferous amount is higher relatively and can't reach high silicon content requirement, and the present invention is at 300m
3The above blast furnace of level adopts indirect smelting technology, but the magnesium iron pig iron of stably manufactured low sulfur content, low titaniferous amount, high silicon content.
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 80% of magnesium iron, magnesium iron pelletizing or lump ore 20%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.76; Blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.35%, [S] is 0.019%; Take by weighing ferrosilicon powder 950kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 15kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure-controlling 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C4.3%, Si1.10%, Mn0.10%, P0.040%, S0.009%, Ti 0.022%, 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 90% of magnesium iron, magnesium iron pelletizing or lump ore 10%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.86; Blast-furnace smelting [Si] control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.45%, [S] is 0.015%; Take by weighing ferrosilicon powder 2450kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 7.5kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure-controlling 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C4.4%, Si2.40%, Mn0.15%, P0.045%, S0.010%, Ti0.025%, 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 70% of magnesium iron, magnesium iron pelletizing or lump ore 30%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.66; Blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.25%, [S] is 0.027%; Take by weighing ferrosilicon powder 950kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 27kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure-controlling 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C4.0%, Si1.01%, Mn0.08%, P0.035%, S0.009%, Ti0.020%, surplus Fe.
Embodiment 4: 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 85% of magnesium iron, magnesium iron pelletizing or lump ore 15%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.80; Blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.40%, [S] is 0.018%; Take by weighing ferrosilicon powder 1250kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 15kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure-controlling 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C4.2%, Si1.40%, Mn0.10%, P0.040%, S0.008%, Ti0.022%, surplus Fe.
Embodiment 5: 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 80% of magnesium iron, magnesium iron pelletizing or lump ore 20%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.76; Blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.35%, [S] is 0.019%; Take by weighing ferrosilicon powder 940kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 17.5kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C 4.3%, Si 1.10%, Mn 0.10%, P 0.040%, S 0.009%, Ti 0.022%, surplus Fe.
Embodiment 6: 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 90% of magnesium iron, magnesium iron pelletizing or lump ore 10%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.86; Blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.45%, [S] is 0.015%; Take by weighing ferrosilicon powder 810kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 12.5kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C4.4%, Si1.24%, Mn0.15%, P0.045%, S0.010%, Ti0.025%, surplus Fe.
Embodiment 7: 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 magnesium iron, magnesium iron pelletizing or lump ore 30%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.66; Blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.25%, [S] is 0.027%; Take by weighing ferrosilicon powder 1140kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 19kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C 4.0%, Si 1.01%, Mn 0.08%, P 0.035%, S 0.008%, Ti 0.020%, surplus Fe.
Embodiment 8: 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 85% of magnesium iron, magnesium iron pelletizing or lump ore 15%, and the high-alkali sinter basicity intermediate value of magnesium iron is controlled at 1.80; Blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35, control titanium content≤0.025%; Molten iron detects that [Si] is 0.40%, [S] is 0.018%; Take by weighing ferrosilicon powder 720kg, when tapping a blast furnace ferrosilicon powder evenly is added on the molten iron stream; Take by weighing magnesium grain 25kg, the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jetting, nitrogen gas stream pressure 600Kpa by spray gun in the iron ladle molten iron.This stove product (50 tons) chemical ingredients is as follows after testing: C 4.2%, Si 1.20%, Mn 0.10%, P 0.040%, S 0.008%, Ti 0.022%, surplus Fe.
Claims (3)
1. an iron for high-silicon ultra-low-sulfur low-titanium ductile pig iron smelting method is 300m in useful volume
3Above blast furnace is implemented, it is characterized in that: described iron for high-silicon ultra-low-sulfur low-titanium ductile is as follows with the chemical ingredients of the pig iron: C 4.0-4.4%, Si 1.00-2.40%, Mn 0.08-0.15%, P 0.035-0.045%, S≤0.010%, Ti≤0.025%, 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 70-90% of magnesium iron, and magnesium iron pelletizing or lump ore 10-30%, the basicity of the high-alkali agglomerate of described magnesium iron is 1.66-1.86;
B. low silicon smelting: blast-furnace smelting silicone content control 0.25-0.45%, R
3Control 1.25-1.35;
C. stokehole silicon addition: whenever increase the amount that 0.1% silicon adds the 1.8-3.0kg ferrosilicon powder according to the ton molten iron when tapping a blast furnace and add ferrosilicon powder;
D. stokehold spray magnesium stirring desulphurization is handled: the back of tapping a blast furnace utilizes the nitrogen magnesium grain of jet by spray gun in the iron ladle molten iron, and the winding-up amount is whenever fallen the 0.01% sulphur 0.2-0.5kg magnesium grain of jetting, nitrogen gas stream pressure-controlling 500-700Kpa for a ton molten iron.
2. iron for high-silicon ultra-low-sulfur low-titanium ductile pig iron smelting method according to claim 1 is characterized in that: S≤0.03%, P≤0.02%, TiO in the high-alkali agglomerate composition of the magnesium iron of described blast furnace raw material
2≤ 0.10%; TiO in the magnesium iron pelletizing composition
2≤ 0.10%, P≤0.020%, S≤0.10%; TiO in the magnesium iron lump ore composition
2≤ 0.10%, P≤0.020%, S≤0.3%.
3. iron for high-silicon ultra-low-sulfur low-titanium ductile pig iron smelting method according to claim 1 and 2 is characterized in that: in the described stokehole silicon addition step ferrosilicon powder evenly is added on the molten iron stream.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775452B (en) * | 2010-02-02 | 2011-04-20 | 河北龙凤山铸业有限公司 | Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron |
| CN102094099A (en) * | 2011-01-17 | 2011-06-15 | 中国恩菲工程技术有限公司 | Ferronickel refining system |
| CN104195281A (en) * | 2014-08-01 | 2014-12-10 | 南京钢铁股份有限公司 | Method for producing foundry pig iron from pig iron for steel manufacture by virtue of silicon pickup outside furnace |
| CN110004257A (en) * | 2019-04-18 | 2019-07-12 | 临沂玫德庚辰金属材料有限公司 | Molten iron purification technology is used in a kind of casting of short route |
| CN110408737A (en) * | 2019-08-14 | 2019-11-05 | 临沂玫德庚辰金属材料有限公司 | A kind of dedicated pig iron making process of wind power casting |
-
2009
- 2009-05-07 CN CN200910074305A patent/CN101545019A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101775452B (en) * | 2010-02-02 | 2011-04-20 | 河北龙凤山铸业有限公司 | Method for smelting ultra-low sulfur, silicon and titanium grey nodular cast iron by pig iron |
| CN102094099A (en) * | 2011-01-17 | 2011-06-15 | 中国恩菲工程技术有限公司 | Ferronickel refining system |
| CN102094099B (en) * | 2011-01-17 | 2013-07-17 | 中国恩菲工程技术有限公司 | Ferronickel refining system |
| CN104195281A (en) * | 2014-08-01 | 2014-12-10 | 南京钢铁股份有限公司 | Method for producing foundry pig iron from pig iron for steel manufacture by virtue of silicon pickup outside furnace |
| CN110004257A (en) * | 2019-04-18 | 2019-07-12 | 临沂玫德庚辰金属材料有限公司 | Molten iron purification technology is used in a kind of casting of short route |
| CN110408737A (en) * | 2019-08-14 | 2019-11-05 | 临沂玫德庚辰金属材料有限公司 | A kind of dedicated pig iron making process of wind power casting |
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