CN109811098A - A kind of low silicon smelting method of 1000 cubes of grade blast furnaces - Google Patents
A kind of low silicon smelting method of 1000 cubes of grade blast furnaces Download PDFInfo
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- CN109811098A CN109811098A CN201910138536.2A CN201910138536A CN109811098A CN 109811098 A CN109811098 A CN 109811098A CN 201910138536 A CN201910138536 A CN 201910138536A CN 109811098 A CN109811098 A CN 109811098A
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Abstract
The invention discloses a kind of low silicon smelting methods of 1000 cubes of grade blast furnaces, belong to ironmaking field, including the following contents, carry out the stock of furnace charge as required, furnace charge includes 75~85 parts of sinter, 15~25 parts of pellet and coke；Control mine batch when controlling blast furnace parameter stability, including coal powder injection rate, pressure difference, hot blast temperature, oxygen-enriched intake, molten iron physical thermal and press, and feeding；Clinker parameter is controlled, basicity of slag, the content of MgO in control clinker, Al are improved2O3Content and magnalium ratio.The present invention can reduce silicone content in molten iron, improve the capacity factor of a blast furnace, reduce fuel ratio, while reducing CO2Discharge, energy conservation and environmental protection.
Description
Technical field
The present invention relates to a kind of smelting process, especially a kind of blast furnace low silicon smelting method belongs to ironmaking field.
Background technique
In blast furnace ironmaking process, drop silicon is a great energy-saving and production-increase measure.Blast furnace, which carries out low silicon smelting, can both reduce height
Oven coke ratio and raising yield, can also promote pneumatic steelmaking to carry out without slag or less-slag melting, to reduce steel-making cost.Currently,
There are three ways to reduction used in actual production blast-melted Si content: the outer desiliconization pretreatment of molten iron furnace, tuyere injection are de-
Pre-desiliconizing, blast furnace Low Silicon Smelting Technology in silicea furnace.Wherein blast furnace Low Silicon Smelting Technology refers to the Si reduction reason in understanding blast furnace
On basis, by improving the operating condition of blast furnace, using suitable operational means, on the basis of conditions of blast furnace stable smooth operation
On, the environment of an inhibition Si reduction is caused in entire blast furnace, to obtain the lower molten iron of Si content.
The control to crude fuel is generallyd use in blast furnace low silicon smelting at present and improves operation, reduces the amount of bringing into and iron of silicon
Water inhales silicon amount, reinforces desilication reaction.But existing blast furnace technology there are still fuel ratios it is high, energy consumption is high the problems such as.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of low silicon smelting methods of 1000 cubes of grade blast furnaces, can drop
Silicone content in low molten iron improves the capacity factor of a blast furnace, reduces fuel ratio, while reducing CO2Discharge, energy conservation and environmental protection.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of low silicon smelting method of 1000 cubes of grade blast furnaces, it is characterised in that: including the following contents,
The stock of furnace charge is carried out as required, and furnace charge includes 75~85 parts of sinter, 15~25 parts of pellet and coke；
Control blast furnace parameter stability, including coal powder injection rate, pressure difference, hot blast temperature, oxygen-enriched intake, molten iron physical thermal and
Control mine batch when pressing, and feeding；
Clinker parameter is controlled, basicity of slag, the content of MgO in control clinker, Al are improved2O3Content and magnalium ratio.
Technical solution of the present invention further improvement lies in that: sinter cryogenic reducting powder index RDI+3.15>=65%, entirely
Iron content >=52%, content of MgO >=2.3%.
Technical solution of the present invention further improvement lies in that: pellet compression strength >=2000N/, all iron content >=
60%, content of MgO≤1.5%, reduction swellability rate≤15%.
Technical solution of the present invention further improvement lies in that: coke ash≤12.5%, coke strenth M25> 91%, M10
< 7%, coke reactivity are 30~40%, and post reaction strength is 40~45%.
Technical solution of the present invention further improvement lies in that: oxygen-enriched intake be 3.5~5.5%, hot blast temperature 1170
~1190 DEG C.
Technical solution of the present invention further improvement lies in that: press as 185~195KPa, pressure difference is 145~155KPa.
Technical solution of the present invention further improvement lies in that: coal powder injection rate fluctuation≤± 200kg/h, molten iron physical thermal >=
1450℃。
Technical solution of the present invention further improvement lies in that: furnace charge mine batch is 29~30t.
Technical solution of the present invention further improvement lies in that: basicity of slag be 1.24~1.28.
Technical solution of the present invention further improvement lies in that: in clinker content of MgO be 9.5~10.3%, Al2O3Content is
14.5~15.5%, magnalium ratio is 0.65~0.7.
By adopting the above-described technical solution, the technological progress achieved by the present invention is:
A kind of low silicon smelting method of 1000 cubes of grade blast furnaces provided by the invention, can reduce silicone content in molten iron, mentions
The high capacity factor of a blast furnace reduces fuel ratio, while reducing CO2Discharge, energy conservation and environmental protection.
Method of the invention can be adapted for second-rate furnace charge, and sinter all iron content is minimum reachable in raw material
52%, all iron content is minimum up to 60% in pellet, and the content of silicon accordingly can be high in furnace charge at this time, higher in furnace charge silicone content
In the case where by silicone content lower just it is extremely difficult.The present invention passes through sinter cryogenic reducting powder index in control furnace charge
RDI+3.15>=65%, content of MgO >=2.3%, pellet compression strength >=2000N/, content of MgO≤1.5%, reduction swellability
Rate≤15%.Cooperating oxygen-enriched intake in high furnace parameters simultaneously is 3.5~5.5%, and hot blast temperature is 1170~1190 DEG C, press
For 185~195KPa, pressure difference is 145~155KPa, and coal powder injection rate fluctuation≤± 200kg/h, molten iron physical thermal >=1450 DEG C can
To guarantee blast furnace low silicon smelting stable smooth operation, working of a furnace fluctuation is reduced, improves the capacity factor of a blast furnace, and realize Silicon Content of Hot Metal
Amount is down to 0.2% or so.Pass through the restriction of STRENGTH ON COKE parameter, coke ash≤12.5%, coke strenth M25> 91%, M10<
7%, coke reactivity is 30~40%, and post reaction strength is 40~45%, has saved the dosage of coke and coal dust, has reduced life
Cost is produced, while reducing coke ratio, coal ratio, greatly reduces CO2Discharge amount reduces environmental pollution.
Use suitable slagging regime in the present invention, obtain the clinker of higher alkalisation, when basicity of slag is 1.24~
When 1.28, it is easy to generate 3CaOSiO2And 2CaOSiO2Equal compounds, to reduce SiO2Activity, reduce the reduction of silicon,
The desulphurizing ability of clinker can be improved again simultaneously.Although basicity of slag is excessively high, the fusion temperature and viscosity of clinker are gradually risen,
Mobility is deteriorated, then will affect the stability of the working of a furnace, and smelting is caused to can not be successfully progress.But the application is by controlling high wind
Temperature, height press, content of MgO is 9.5~10.3%, Al in high oxygen-enriched intake, clinker2O3Content is 14.5~15.5%, magnalium
Than for the parameters such as 0.65~0.7, realizing not only reduces silicone content, but also guarantee the stable purpose of the working of a furnace.
Specific embodiment
Here is certain specific embodiments of the invention, to be described in further detail.
A kind of low silicon smelting method of 1000 cubes of grade blast furnaces, including the following contents,
The stock of furnace charge is carried out as required, and furnace charge includes 75~85 parts of sinter, 15~25 parts of pellet and coke；It is preferred that
Ground, sinter cryogenic reducting powder index RDI+3.15>=65%, all iron content >=52%, content of MgO >=2.3%.Pellet is anti-
Compressive Strength >=2000N/, all iron content >=60%, content of MgO≤1.5%, reduction swellability rate≤15%.Coke ash≤
12.5%, coke strenth M25> 91%, M10< 7%, coke reactivity are 30~40%, and post reaction strength is 40~45%；
Control blast furnace parameter stability, including coal powder injection rate, pressure difference, hot blast temperature, oxygen-enriched intake, molten iron physical thermal and
Control mine batch when pressing, and feeding；Preferably, oxygen-enriched intake is 3.5~5.5%, and hot blast temperature is 1170~1190
℃；, press as 185~195KPa, pressure difference is 145~155KPa；, coal powder injection rate fluctuation≤± 200kg/h, molten iron physical thermal >=
1450℃；Furnace charge mine batch is 29~30t.
Clinker parameter is controlled, basicity of slag, the content of MgO in control clinker, Al are improved2O3Content and magnalium ratio；It is preferred that
Ground, basicity of slag are 1.24~1.28；Content of MgO is 9.5~10.3%, Al in clinker2O3Content is 14.5~15.5%, magnesium
Aluminium ratio is 0.65~0.7.
Conditions of blast furnace stable smooth operation is the premise for practicing low silicon smelting in method of the invention.Each worker need to know thus
The mark of the normal working of a furnace, deepens the understanding to the working of a furnace, the working of a furnace of analysis in every 2 hours；Few adjust is finely tuned, and coal powder injection rate fluctuation≤±
200kg/h, tuyere diameter is the same, and outer work is consistent, and 30S is observed in each air port, stablizes wind-warm syndrome；In strict accordance with casting schedule
Iron is put, load is not moved back within damping down 5h, a Monday school claims.
Mine of the invention batch has carried out increase appropriate, so as to reduce the frequency of adding raw materials, reduces conditions of blast furnace
Disturbed frequency.Although mine batch increases, this method, which also passes through, increases oxygen enrichment percentage, hot blast temperature and furnace top pressure etc.,
Guarantee smelting quality, to achieve the effect that improve smelting quality and efficiency.
Embodiment 1
Blast furnace process furnace charge includes 75 parts of sinters, 25 parts of pellets and coke.The primary chemical of sinter and pellet
Ingredient is as shown in table 1, wherein sinter basicity 1.85, basicity 0.31.Sinter cryogenic reducting powder index RDI+3.15For
65%；Pellet compression strength is 2000N/, and reduction swellability rate is 15%；Coke ash is 12.5%, coke strenth M25>
91%, M10< 7%, coke reactivity 30%, post reaction strength 40%.
Table 1
| Title | TFe (%) | FeO (%) | SiO2(%) | CaO (%) | S (%) | MgO (%) | R2(%) | Al2O3(%) |
| Sinter | 52.87 | 8.46 | 6.19 | 11.47 | 0.07 | 2.88 | 1.85 | 2.87 |
| Pellet | 61.25 | 1.01 | 6.42 | 1.97 | 0.12 | 1.29 | 0.31 | 1.35 |
Control blast furnace parameter stability, including coal powder injection rate, pressure difference, hot blast temperature, oxygen-enriched intake, molten iron physical thermal and
Control mine batch when pressing, and feeding, design parameter is shown in Table 2.
Table 2
Basicity of slag is 1.25, and content of MgO is 9.5%, Al in clinker2O3Content is 14.5%, and magnalium ratio is 0.65.
Embodiment 2~3
Embodiment 2~3 is same as Example 1, and difference is shown in Table 3.
Table 3
Comparative example 1~8
Comparative example 1~8 is same as Example 1, the difference is that: sinter is 74 parts in comparative example 1, pellet 26
Part；Sinter is 86 parts in comparative example 2, and pellet is 14 parts；It is 1.23 that gained basicity of slag is smelted in comparative example 3；Comparative example 4
Basicity of slag obtained by middle smelting is 1.29；Oxygen-enriched intake is 3.4% in comparative example 5；Oxygen-enriched intake is in comparative example 6
5.6%；Hot blast temperature is 1160 DEG C in comparative example 7；Hot blast temperature is 1200 DEG C in comparative example 8.
Test example
The silicon content of molten iron in Examples 1 to 3, comparative example 1~8 is detected, detection method is according to GB/T24234-
2009 " the measurement spark discharge atomic emission spectrometries (conventional method) of cast iron multielement content " carry out, and the results are shown in Table 4.
Table 4
It is analyzed by table 4 it is found that Examples 1 to 3 passes through to charge composition, basicity of slag, oxygen-enriched intake, hot blast temperature etc.
Control, in the molten iron greatly reduced the content of silicon down to, compared with comparative example, silicone content in the molten iron that the present invention obtains
Down to 0.2~0.22%, 0.1~0.2 percentage point lower than comparative example.
In order to further verify superiority of the invention, inventor calculates economic benefit and social benefit.With
One 1050m3For blast furnace, for 2710 tons, molten steel consumption amount of coke per ton is per day production iron water amount before using the present invention
397kg, molten steel consumption coal dust amount per ton are 177kg；Per day production iron water amount is 2918 tons after applying the present invention, and molten iron per ton disappears
Consumption amount of coke is 356kg, and molten steel consumption coal dust amount per ton is 157kg.
It is as follows to increase hot metal output, saving coke and quality of pc difference blast furnace year:
△WFeTen thousand tons of=(2918-2710) × 365=7.6
△WCoke=(397-356) × (2918 × 365)=4.37 ten thousand ton
△WCoal dust=(177-157) × (2918 × 365)=2.13 ten thousand ton
Year emission reduction CO2Are as follows: ten thousand tons of (4.37 × 0.85+2.13 × 0.67) × 44/12=18.8.
With 1200 yuan/ton of coke cost, 800 yuan/ton of coal dust cost calculating, 69,480,000 yuan of cost can be reduced every year, year subtracts
Arrange CO218.8 ten thousand tons, effects of energy saving and emission reduction is significant.
Claims (10)
1. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces, it is characterised in that: including the following contents,
The stock of furnace charge is carried out as required, and furnace charge includes 75~85 parts of sinter, 15~25 parts of pellet and coke；
Control blast furnace parameter stability, including coal powder injection rate, pressure difference, hot blast temperature, oxygen-enriched intake, molten iron physical thermal and top
Control mine batch when pressing, and feeding；
Clinker parameter is controlled, basicity of slag, the content of MgO in control clinker, Al are improved2O3Content and magnalium ratio.
2. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: sinter is low
Warm reduction degradation index RDI+3.15>=65%, all iron content >=52%, content of MgO >=2.3%.
3. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: pellet is anti-
Compressive Strength >=2000N/, all iron content >=60%, content of MgO≤1.5%, reduction swellability rate≤15%.
4. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: coke ash
≤ 12.5%, coke strenth M25> 91%, M10< 7%, coke reactivity are 30~40%, and post reaction strength is 40~45%.
5. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: oxygen-enriched to be passed through
Amount is 3.5~5.5%, and hot blast temperature is 1170~1190 DEG C.
6. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: press and be
185~195KPa, pressure difference are 145~155KPa.
7. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: coal powder injection rate
Fluctuation≤± 200kg/h, molten iron physical thermal >=1450 DEG C.
8. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: furnace charge mine batch
For 29~30t.
9. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: basicity of slag
It is 1.24~1.28.
10. a kind of low silicon smelting method of 1000 cubes of grade blast furnaces according to claim 1, it is characterised in that: in clinker
Content of MgO is 9.5~10.3%, Al2O3Content is 14.5~15.5%, magnalium ratio is 0.65~0.7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112626296A (en) * | 2020-12-17 | 2021-04-09 | 本钢板材股份有限公司 | Method for optimizing fluidity of low-aluminum slag |
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| KR20030053148A (en) * | 2001-12-22 | 2003-06-28 | 주식회사 포스코 | Method for Manufacturing the Pig Iron with Low Silicon Content |
| CN106048114A (en) * | 2016-07-19 | 2016-10-26 | 东北大学 | Method for blast furnace to use hot-press ferrous coke to perform low-carbon ironmaking |
| CN106555020A (en) * | 2015-09-30 | 2017-04-05 | 上海梅山钢铁股份有限公司 | A kind of method for improving blast-furnace slag performance |
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2019
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20030053148A (en) * | 2001-12-22 | 2003-06-28 | 주식회사 포스코 | Method for Manufacturing the Pig Iron with Low Silicon Content |
| CN106555020A (en) * | 2015-09-30 | 2017-04-05 | 上海梅山钢铁股份有限公司 | A kind of method for improving blast-furnace slag performance |
| CN106048114A (en) * | 2016-07-19 | 2016-10-26 | 东北大学 | Method for blast furnace to use hot-press ferrous coke to perform low-carbon ironmaking |
Non-Patent Citations (1)
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| 李志明 等: ""邯钢高炉低硅冶炼技术的应用"", 《河北冶金》 * |
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| CN112626296A (en) * | 2020-12-17 | 2021-04-09 | 本钢板材股份有限公司 | Method for optimizing fluidity of low-aluminum slag |
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