CN108264224A - A kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process - Google Patents
A kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process Download PDFInfo
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- CN108264224A CN108264224A CN201711500635.8A CN201711500635A CN108264224A CN 108264224 A CN108264224 A CN 108264224A CN 201711500635 A CN201711500635 A CN 201711500635A CN 108264224 A CN108264224 A CN 108264224A
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- slag
- mineral wool
- smelted
- blow
- al2o3
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/06—Manufacture of glass fibres or filaments by blasting or blowing molten glass, e.g. for making staple fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/002—Use of waste materials, e.g. slags
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/02—Pretreated ingredients
- C03C1/026—Pelletisation or prereacting of powdered raw materials
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
-
- 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
- C21C5/36—Processes yielding slags of special composition
Abstract
The invention discloses a kind of smelting processes that slag is smelted into mineral wool material in convertor steelmaking process.The technique is will to make steel the quenched mineral wool material met the requirements into acidity and temperature of initial stage slag by adding adjusting material or reducing agent.The present invention takes full advantage of the existing converter installation of steel mill, it takes full advantage of slag and slag thermal energy itself produces high added value mineral wool material, it solves the problems, such as that slag heat energy utilization and converter slag utilize, opens some effective of a slag high value added utilization；At the same time, due to the addition of adjusting material, slag fluidity greatly improves, and the phosphorous quantity of slag poured out after smelting initial stage is significantly increased, and alleviates follow-up dephosphorization burden；The quenched blowing later stage implements pressure rifle operation, and FeO contents and metal Ferrum content in slag is greatly reduced, advantageously reduces steel technology, is conducive to improve mineral wool quality；This technique modification agent is various waste residues, that is, solves waste residue utilization and improve its utility value again；In addition, the yield that the exploitation of this technique will greatly reduce other cotton techniques processed, the exhaust emission that coal consumption is greatly reduced and thus brings have huge economic benefit and social benefit.
Description
Technical field
This technique is related to pneumatic steelmaking field, and in particular to slag is smelted into mineral wool material while pneumatic steelmaking.
Background technology
It has been ripe technique that blast furnace dry slag or hot molten blast furnace slag melting are made mineral wool, has utilization to turn in recent years
A kind of patent application technology " method using converter molten state early period slag production mineral wool " of stove molten steel slag production mineral wool
(application number：201610369708.3) it comes out, which is come out of the stove entrance using converter low alkalinity early period molten steel slag
Modification agent is added in during slag ladle and exothermic mixture, that is, ferrosilicon aluminum reducing agent reduction is heating up, iron oxide in slag is reduced, offsets
SiO2 materials or AL2O3 matter change the temperature drop generated after material agent adds in, by stirring, stand homogeneous, are then blow molded into mineral wool system
Product.The patented technology practical application can there are many problems.By the converter initial stage slag modification of basicity (CaO/SiO2) 1.0-2.0
Into the mineral wool that acidity (SiO2+Al2O)/(CaO+MgO) is 1.1-1.7, need to add in a large amount of modification agent and reducing agent, have
Up to more than 30%, other than the heat that reducing agent generates, without other heat source, slag viscosity is natively big, slag ladle volume
It is again small, a large amount of modification agent and reducing agent are added, can not be stirred evenly, it is difficult to reach the modification effect of mineral wool needs.Using
Mechanical agitation, service life and mixing effect should not all use, and using Gas Stirring, can generate splash and big temperature drop,
Also can not implement；Since without other heat sources, the modification agent added in when being modified to acidity more than 1.5 and reduction dosage are big, reducing agent
The small heat of addition is inadequate, if reducing agent addition amount is crossed FeO contents in slag and can not be ensured, thus slag charge viscosity is unable to control,
So it is even more that can not implement with patented technology production rock wool.One block converter of patented technology needs 2-5 slag ladles frequently to hang simultaneously
Fortune, the operating rate of driving also do not allow；The iron restored is difficult to precipitate recycling completely since slag blanket is very thick.In addition, converter is splashed
Slag furnace retaining technique has made converter lining life be up to more than 30,000 stoves, this just provides precondition for the implementation of the technology of the present invention.
Invention content
In view of the deficiencies of the prior art, the purpose of the present invention is the conditions by converter smelting：Huge smelting space, by force
Big oxygen jet and a large amount of molten steel, slag and furnace body thermal energy are not being influenced to make steel dephosphorization or promoted de- in smelting process
The quenched initial stage slag for directly generating pneumatic steelmaking in converter under the premise of phosphorus is that acidity (SiO2+Al2O)/(CaO+MgO) reaches
The mineral wool material of 1.1-1.7, without remaking modifier treatment outside stove.
Technical solution
The double slags of converter stay slag process for making initial stage basicity of slag relatively low, general basicity R1.0-2.0, University of Science ＆ Technology, Beijing Wang Xin
Professor Hua explore 1350 DEG C of cold stage ±, relatively low dephosphorization basicity of slag 1.1-1.5, MgO4-7.5%, FeO≤15% is de-
The smelting parameter of phosphorus；Some factory's initial stage slag dephosphorized slag selection basicity 2.0 or so, smelting tapping temperature is 1400-1450 DEG C higher, takes off
Phosphorus effect is also fine, and only molten iron carbon amount of oxidation is big, and remaining carbon is relatively low, and smelting heat to follow-up decarburizing phase makes some difference；, have
Desiliconization slag is directly outwelled after converter smelting desiliconization by a little factories, and the desiliconization basicity of slag is sometimes less than 1；Converter duplex technique dephosphorization stove takes off
Phosphorus slag basicity is preferable in 1.2 or so dephosphorization effects.These low basicity slags provide the foundation for the exploitation of the present invention.
It is such, each factory that the present invention is a kind of to be smelted into the technical solution of mineral wool material in convertor steelmaking process by slag
Family can according to respective smelting pattern carry out initial stage smelt dephosphorization, it is characterized in that according to initial stage slag ingredient and temperature in blow off
Disposably or in batches adjusting material being added in before slagging tap, modifier treatment being carried out to clinker, at the same time pressing rifle blowing, smelting stops in the early stage
Slag or tapping (half steel) are blown out before by the acidity and component requirements needed for slag acidity and composition adjustment to mineral wool, that is, is being stopped
By the quenched mineral slag wool for acidity 1.1-1.7, FeO 3-15% of initial stage slag, 1330-1450 DEG C of tapping temperature before blowout slag.It adjusts
The additive amount of matter agent is the 10-40% of slag amount；The higher heat of some iron oxide contents is contemplated that addition reducing agent, reducing agent
Additive amount be slag amount 0-10%.The adjusting material is contains mixture groups one or more in SiO2, Al2O3 substance
Into adjusting material granularity 5-50mm.It is described containing SiO2, Al2O3 substance be quartz sand, cullet, clay, tailing, bauxite,
Al2O3 systems refining slag, flyash, cinder, gangue one or two.The reducing agent is one of ferrosilicon, silica flour, carbon, SiC
Kind；It is before blow off is slagged tap that initial stage slag is quenched for acidity 1.1-1.7, FeO 3-15% according to initial stage basicity of slag and the market demand
Mineral slag wool, 1330-1450 DEG C of tapping temperature, after slagging tap heat preservation stand after viscosity suitable for after blow-and-blow machine blow.
In order to reduce the addition of modification agent, preferably converter smelting initial stage low alkalinity R≤1.5, the dephosphorization of MgO≤7.5%
The desiliconization slag of slag or more low alkalinity carry out it is quenched, i.e., by the dephosphorization of dephosphorization stage dephosphorization basicity of slag 1.1-1.5, MgO≤7.5% or more
Clinker is carried out before the desiliconization slag to finishing blowing of low alkalinity quenched.It is when the adjusting material addition of addition is excessive, then general first to add
Enter Al2O3 matter adjusting material or SiO2 and Al2O3 materials as main component improve Al2O3 contents in slag, slag viscosity is dropped
Acidity that is low while improving clinker, basicity do not reduce or be decreased slightly as it is low, do not influence dephosphorization or promote dephosphorization, be added followed by SiO2 tune
Matter agent reduces basicity of slag, and the blowing of rifle rifle is pressed while adjusting material is eventually adding, and smelts stove in the early stage before blow off is slagged tap
Slag acidity, FeO contents, temperature are adjusted to the requirement needed for blowing mineral wool.
Advantageous effect
The advantageous effect that the present invention obtains is to take full advantage of the existing converter installation of steel mill, take full advantage of slag and
Slag thermal energy itself produces high added value mineral wool material, solves the problems, such as that slag heat energy utilization and converter slag utilize, opens
The some effective of a slag high value added utilization is warded off；At the same time, due to the addition of adjusting material, slag fluidity substantially changes
Kind, the phosphorous quantity of slag poured out after smelting initial stage is significantly increased, and alleviates follow-up dephosphorization burden；The quenched blowing later stage implements pressure
Rifle operates, and FeO contents and metal Ferrum content in slag is greatly reduced, advantageously reduces steel technology, is conducive in raising mineral wool
Quality；This technique modification agent is various waste residues, that is, solves waste residue utilization and improve its utility value again；The exploitation of this technique will be big
The yield of other cotton techniques processed is reduced greatly, and the exhaust emission that coal consumption is greatly reduced and thus brings has huge warp
Benefit of helping and social benefit.
Specific embodiment
Acidity requirements according to converter smelting initial stage basicity of slag, temperature, ingredient and mineral wool it is disposable or in batches to
Adjusting material (addition is the 10-40% of the quantity of slag) and reduction exothermic mixture (addition is the 0-10% of the quantity of slag) are added in stove, with this
Rifle position is controlled to carry out initial stage slag or dephosphorized slag simultaneously quenched, it is quenched complete while smelting before terminating or terminate at converter initial stage
Finish, then slag tap, heat preservation, which is stood, directly send blow-and-blow machine that can blow mineral wool suitable for after after viscosity.
Embodiment 1
110 tons of converter, 95 tons of molten iron charge weight, 12 tons of steel scrap stay slag technological operation using double slags, and blow 5 ' 30 " dephosphorized slags
Ingredient TFe14.5%, FeO 13.1%, CaO 41.7%, SiO2 27.8%, MgO 6.2%, P2O5 3.2%, Al2O3
2.1%, MnO 2.83%R 1.5；700 kilograms of yellow sand is added after 750 kilograms of bauxites of addition, pressure rifle blowing about 30 ", with this
Meanwhile continue press rifle behaviour 20 " after blow off slag tap, obtain it is quenched after slag acidity 1.2, FeO 4.8%, 1356 DEG C of temperature, heat preservation
Standing directly send blow-and-blow machine that can blow mineral wool suitable for after after viscosity.
Embodiment 2
110 tons of converter, 93 tons of molten iron charge weight, 13 tons of steel scrap stay slag technological operation using double slags, and blow 5 ' 20 " dephosphorized slags
Ingredient TFe16.5%, FeO 15.1%, CaO 35.79%, SiO2 29.8%, MgO 5.27%, P2O5 3.3%, Al2O3
1.82%, MnO 2.81%, R 1.2；Yellow sand 700 is added after 750 kilograms of Al2O3 systems refining slags of addition, pressure rifle blowing about 30 "
Kilogram, at the same time, continue to press rifle operation 30 ", it slags tap after blow off, obtains acidity 1.2, FeO 4.5%, 1341 DEG C of temperature is protected
Temperature, which is stood, directly send blow-and-blow machine that can blow mineral wool suitable for after after viscosity.
Embodiment 3
110 tons of converter, 97 tons of molten iron charge weight, 11 tons of steel scrap, using slag technological operation is stayed, blow 3 ' 20 " desiliconization slag ingredients
TFe21.5%, FeO 19.52%, CaO 25.6%, SiO2 31.8%, MgO 4.5%, P2O5 2.01%, Al2O3
0.81363 DEG C of 3.22%, MnO 4.03%, R；450 kilograms of bauxites are added in, at the same time, pressure rifle operation 1 ' 10 ", blow off carries
It slags tap after adding in 300 kilograms of SiC while rifle, obtains acidity 1.3, FeO 3.2%, 1370 DEG C of temperature keeps the temperature to stand and directly send
Blow-and-blow machine can blow mineral wool after viscosity suitable for after.
Embodiment 4
110 tons of converter, 96 tons of molten iron charge weight, 11 tons of steel scrap stay slag technological operation using double slags, and blow 5 ' 34 " dephosphorized slags
Ingredient TFe26.3%, FeO 21.52%, CaO 21.9%, SiO2 23.22%, MgO 5.6%, P2O5 2.1%, Al2O3
3.01%, MnO 3.03%, R 1.25；It is public that yellow sand 800 is added after 750 kilograms of gangues of addition, pressure rifle operation about 1 ' 20 "
Jin, at the same time, " rear blow off is slagged tap, and obtains acidity 1.6, FeO 11.8%, and 1356 DEG C of temperature keeps the temperature and stands for pressure rifle operation 10
Directly send blow-and-blow machine that can blow mineral wool suitable for after after viscosity.
Embodiment 5
110 tons of converter, 94 tons of molten iron charge weight, 13 tons of steel scrap stay slag technological operation using double slags, and blow 2 ' 58 " desiliconization slags
Ingredient：TFe21.5%, FeO 20.1%, CaO 17.28%, SiO2 28.8%, MgO 6.7%, P2O5 1.8%, Al2O3
3.1%, MnO 2.83%, R 0.6；850 kilograms of bauxites are added in, at the same time, " rear blow off is slagged tap, and is obtained for pressure rifle oxygen blast 1 ' 35
To quenched rear slag acidity 1.7, FeO 12.8%, 1397 DEG C of temperature, heat preservation, which is stood, directly send blow-and-blow machine can suitable for after after viscosity
Blow mineral wool.
Embodiment 6
110 tons of converter, 92 tons of molten iron charge weight, 11 tons of steel scrap, using slag technological operation is stayed, blow 3 ' 5 " desiliconization slag ingredients：
TFe18.6.5%, FeO 16.1%, CaO 26.6%, SiO2 33.2MgO 6.7%, P2O5 2.3%, Al2O3 3.3%,
MnO 3.71%, R 0.8；1270 kilograms of coal ash balls are added in, at the same time, " rear blow off is slagged tap, and is obtained for pressure rifle blowing about 1 ' 20
Slag acidity 1.6 after quenched, FeO 10.8%, 1357 DEG C of temperature, heat preservation, which is stood, directly send blow-and-blow machine that can be blown suitable for after after viscosity
Mineral wool processed.
Embodiment 7
110 tons of converter, 100 tons of molten iron charge weight, 8 tons of steel scrap, using staying slag technological operation, blowing 3 ' 05 " desiliconization slag into
Point：TFe24.5%, FeO 16.1%, CaO 19.6%, SiO2 31.7%, MgO 4.8%, P2O5 1.92%, Al2O3
3.4%, MnO 4.03%, R 0.6；
800 kilograms of coal ash balls are added in, at the same time, pressure rifle blowing about 1 ' 10 ", blow off is slagged tap, and obtains quenched rear clinker
Acidity 1.7, FeO 11.9%, 1379 DEG C of temperature, heat preservation, which is stood, directly send blow-and-blow machine that can blow mineral wool suitable for after after viscosity.
Embodiment 8
110 tons of converter, 94 tons of molten iron charge weight, 12 tons of steel scrap stay slag technological operation using double slags, and blow 5 ' 40 " dephosphorized slags
Ingredient：TFe25.5%, FeO16.1%, CaO40.6%, SiO2 22.6%, MgO 5.9%, P2O5 3.28%, Al2O3
3.6%, MnO 3.17%, R 1.8；1050 kilograms of gangues are added in, at the same time, pressure rifle blowing about 1 ' 06 ", while carrying rifle
500 kilograms of ferrosilicon is added in, blow off is slagged tap, and obtains quenched rear slag acidity 1.2, FeO 3.6%, 1390 DEG C of temperature, heat preservation standing
Directly send blow-and-blow machine that can blow mineral wool suitable for after after viscosity.
Technical scheme of the present invention is further illustrated with embodiment above, and is not intended to limit the present invention.It is any
Any modification or improve the power that should all belong to the present invention that people familiar with the art person is made based on the technology of the present invention principle
The claimed range of profit.
Claims (6)
1. a kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process, it is characterised in that initial stage blowing is
Will at the end of, according to blowing initial stage dephosphorized slag or desiliconization slag ingredient before blow off is slagged tap or go out it is disposable before half steel or in batches plus
Enter adjusting material, reducing agent to clinker progress modifier treatment, rifle blowing is at the same time pressed to smelt blow off in the early stage and slags tap or taps (partly
Steel) before slag acidity and iron oxide content are adjusted to the requirement of acidity and ingredient and temperature needed for mineral wool, wherein adjusting
The additive amount of matter agent is the 10-40% of slag amount；Reducing agent additive amount is the 0-10% of slag amount.
2. a kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process as described in right 1, feature
It is that the desiliconization slag progress of preferred converter low alkalinity R≤1.5, the dephosphorized slag of MgO≤7.5% or more low alkalinity is quenched.It adds in
When adjusting material addition is excessive, then general Al2O3 matter adjusting material or the SiO2 and Al2O3 materials as main component of first adding in is by slag
Middle Al2O3 contents improve, and slag viscosity reduces to the acidity for improving clinker simultaneously, and basicity does not reduce or be decreased slightly as low, does not influence to take off
Phosphorus promotes dephosphorization, and being added followed by SiO2 adjusting materials reduces basicity of slag, rifle blowing is pressed while adjusting material is added in, first
Phase smelts is adjusted to the requirement needed for blowing mineral wool before blow off is slagged tap by slag acidity, FeO contents, temperature.
3. a kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process as described in right 1, feature
Mineral wool material acidity [(SiO2+Al2O)/(CaO+MgO)] is 1.1-1.7, Feo contents 3-15% after being initial stage smelting modification.
4. a kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process as described in right 1, feature
It is containing mixture compositions one or more in SiO2, Al2O3 substance, adjusting material granularity 5-50mm to be the adjusting material.
5. a kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process as described in right 1, feature
Be, it is described containing SiO2, Al2O3 substance be quartz sand, cullet, clay, tailing, bauxite, Al2O3 systems refining slag, powder
Coal ash, cinder, gangue one or two.
6. a kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process as described in right 1, feature
It is the reducing agent for one of ferrosilicon, silica flour, SiC kind.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110055370A (en) * | 2019-04-30 | 2019-07-26 | 马鞍山钢铁股份有限公司 | A kind of new type high temperature steel slag modification agent and modified pretreating process |
| CN110218827A (en) * | 2019-07-09 | 2019-09-10 | 鞍钢股份有限公司 | A kind of molten blast furnace slag adjusting material and its preparation, application method |
| CN113818278A (en) * | 2021-09-07 | 2021-12-21 | 南京钢铁股份有限公司 | Manufacturing method of novel low-cost environment-friendly corrugated base paper |
| CN115369194A (en) * | 2022-09-23 | 2022-11-22 | 马鞍山钢铁股份有限公司 | Method for reducing viscosity of high-temperature steel slag and improving wind crushing treatment proportion |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110055370A (en) * | 2019-04-30 | 2019-07-26 | 马鞍山钢铁股份有限公司 | A kind of new type high temperature steel slag modification agent and modified pretreating process |
| CN110055370B (en) * | 2019-04-30 | 2021-06-04 | 马鞍山钢铁股份有限公司 | High-temperature steel slag modifier and modification pretreatment process |
| CN110218827A (en) * | 2019-07-09 | 2019-09-10 | 鞍钢股份有限公司 | A kind of molten blast furnace slag adjusting material and its preparation, application method |
| CN113818278A (en) * | 2021-09-07 | 2021-12-21 | 南京钢铁股份有限公司 | Manufacturing method of novel low-cost environment-friendly corrugated base paper |
| CN115369194A (en) * | 2022-09-23 | 2022-11-22 | 马鞍山钢铁股份有限公司 | Method for reducing viscosity of high-temperature steel slag and improving wind crushing treatment proportion |
| CN115369194B (en) * | 2022-09-23 | 2024-03-08 | 马鞍山钢铁股份有限公司 | Method for reducing viscosity of high-temperature steel slag and improving wind crushing treatment proportion |
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