CN108676957A - Cold conditions slag renewable resources semi-steel making technique - Google Patents
Cold conditions slag renewable resources semi-steel making technique Download PDFInfo
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- CN108676957A CN108676957A CN201810677903.1A CN201810677903A CN108676957A CN 108676957 A CN108676957 A CN 108676957A CN 201810677903 A CN201810677903 A CN 201810677903A CN 108676957 A CN108676957 A CN 108676957A
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- 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
-
- 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
- C21C5/30—Regulating or controlling the blowing
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
- C21C2200/00—Recycling of waste material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention relates to cold conditions slag renewable resources semi-steel making techniques, belong to converter steeling technology field.Present invention solves the technical problem that being that the cold conditions slag that steel-making generates is not fully used, semi-steel making production cost is high.The technical solution of the present invention is to provide cold conditions slag renewable resources semi-steel making techniques, include the steps that converter blanking, blowing and tapping, the wherein material of blanking includes half steel water, 3~7kg/t of lime steel, 4~8kg/t of dolomitic lime steel, acid 3~7kg/t of composite fluxing medium steel and cold conditions slag 27~31kg/t steel.Pneumatic steelmaking of the present invention is using cold conditions Steel-slag for steelmaking ingredients such as part lime, dolomitic lime and acid composite fluxing mediums, reduce production cost, recycling for copper smelter slag resource is realized, and taps molten steel p and s content≤0.011%, meets fine steel grade requirement.
Description
Technical field
The invention belongs to converter steeling technology fields, and in particular to cold conditions slag renewable resources semi-steel making technique.
Background technology
Climb steel steel-making smelted using vanadium titano-magnetite, in molten iron containing 0.3% or so V, therefore pneumatic steelmaking it
Before, first vanadium extraction is needed, by vanadium extraction by converter blowing, V is aoxidized in molten iron, while the elements such as Si, Mn are also aoxidized in molten iron, C element portion
Divide oxidation, thus half steel has apparent difference with common molten iron.Due to vanadium-bearing hot metal in converter Dephosphorization process for extracting vanadium mesh
It is preceding do not walk also it is logical, molten iron by desulfurization, vanadium extraction pretreatment after, P content there is no variation, remain as 0.060% or so.Cause
And for semisteel converter steelmaking, mainly contain CaO, SiO by additional2Slag making materials ensure that steelmaking process is formed
Clinker with certain dephosphorizing capacity, then according to the distribution ratio of phosphorus, by the way that a certain amount of slag making materials are added come so that half steel
In phosphorus content be down to steel grade phosphorus content requirement.Wherein, the active lime of the slag making materials of pneumatic steelmaking generally use, high magnesite
Ash, composite slag etc..
Energy-saving one of the important topic for having become the common concern of present steel enterprise, it is how both full in STEELMAKING PRODUCTION
Sufficient smelting process demand reduces economic lifeline of the steel-making cost concerning enterprise development again simultaneously.In this regard, climbing steel Xichang steel vanadium half steel
Steel-making once carried out converter experiment using MURC (Multi-Refining Converter) technique, and MURC techniques are that molten iron exists
Furnace slag discharge, reservation molten iron, dephosphorized slag generally pour out 50% after desiliconization, dephosphorization in converter, then make decarbonized slag and carry out decarburization, take off
Tap after carbon, decarbonized slag can be stayed in directly in stove and be blown for next stove dephosphorization, however use MURC techniques generally without
Ji, is mainly reflected in：(1) since the elements such as [Si], [Mn] lack, converter initial stage slag formation speed is slow, and average formation time is 3
Divide half left and right, in converter slagging early period, first slag is just just formed, and does not participate in dephosphorisation reaction fully also；(2) the dephosphorization phase terminates,
The honest reaction between carbon and oxygen violent phase, clinker foamed is serious, and deslagging is difficult, and deslagging process iron and steel stock is lost in serious；(3) due to vanadium extraction
There are thermal loss in process, cause semi-steel making shortage of heat, the converter slagging of falling stove early period that heat damage will be further increased
It loses.
Invention content
Present invention solves the technical problem that be that the cold conditions slag that steel-making generates is not fully used, semi-steel making production
It is of high cost.
The technical solution that the present invention solves above-mentioned technical problem is to provide cold conditions slag renewable resources semi-steel making technique, wraps
The material of the step of including converter blanking, blowing and tapping, the blanking includes half steel water, 3~7kg/t of lime steel, Gao Mei
4~8kg/t of lime steel, acid 3~7kg/t of composite fluxing medium steel and cold conditions slag 27~31kg/t steel, wherein acid compound
Slag former is to mainly contain SiO2Slag making materials.
Wherein, the ingredient of the cold conditions slag is calculated in mass percent including CaO：35~55%, SiO2：8~20%,
MgO：5~15%, FeO：15~25%, Fe2O3：5~10%, MnO：5~10%, P：≤ 0.1%, S：≤ 0.5%, moisture：＜
1%, remaining is impurity.
Further, the cold conditions slag granularity is 30~50mm, and fusing point is 1280~1350 DEG C.
Wherein, the ingredient of half steel water is calculated in mass percent including C：3.2~4.1%, Si：0.015~
0.030%, Mn：0.02~0.04%, P：0.06~0.08%, S：≤ 0.015%, surplus is Fe and inevitable impurity.
Further, the charging temperature of half steel water is 1250~1360 DEG C.
Wherein, the CaO mass contents in the lime are 85~90%.
Wherein, it is 48~55% that the MgO mass contents in the dolomitic lime, which are 30~40%, CaO mass contents,.
Wherein, the SiO in the acid composite fluxing medium2Mass content is 45~55%.
Further, converter is packed into half steel water, and cold conditions slag is added after starting blowing.
Further, 2/3rds cold conditions slag adds after blowing starts in 6min, remaining one third cold conditions
Slag adds in next 4min.
Further, 2/3rds of lime, dolomitic lime and the total dosage of acid composite fluxing medium are added after starting blowing
Enter into converter, lime, dolomitic lime and the acid composite fluxing medium of remaining one third will add in smelting process in batches.
Wherein, the oxygen flow of the blowing is 30000Nm3/ h, ton steel oxygen consume 40~60Nm3, the oxygen lance spraying of the blowing
Head is away from the basic 1.4~1.6m of rifle position of molten pool metal liquid level, and blow rifle position 1.4m~1.6m, opens and blows rifle position 1.8m, catch carbon rifle position
1.4m。
The beneficial effects of the invention are as follows：
Converter semi-steel making of the present invention uses cold conditions steel slag instead part lime, dolomitic lime and acid composite fluxing medium,
The dosage for effectively reducing the steelmaking ingredients such as lime, dolomitic lime and acid composite fluxing medium, compared with common process, lime
Dosage reduces 9~11kg/t steel, and dolomitic lime dosage reduces 10~12kg/t steel, and the dosage of acid composite fluxing medium reduces 7~
9kg/t steel, reduces production cost, realizes recycling for copper smelter slag resource, reduces the place for stacking cold conditions slag
Area reduces the environmental protection pressure of enterprise, contributes to the sustainable development of iron and steel enterprise；Converter semi-steel making of the present invention uses cold
State steel slag instead part lime, dolomitic lime and acid composite fluxing medium, tapping molten steel p and s content are ≤0.011%, full
Sufficient steel grade requirement；The corresponding steel-making parameter of present invention control simultaneously optimizes feed way, ensure that slag mobility and desulfurization,
Dephosphorizing capacity.
Description of the drawings
Fig. 1 is half steel converter dephosphorization theory phosphor partition ratio and practical phosphor partition ratio relational graph.
Specific implementation mode
On the one hand, because containing Si elements in common molten iron, oxidation production SiO in steelmaking process2, thus must be by adding
Enter a large amount of lime to make clinker that there is certain basicity, and climb steel and use semi-steel making, there was only minimal amount in raw material molten iron
Si elements, the materials such as lime are added and only need to meet dephosphorization, therefore P content can be used to be not up to the converter of saturation value
Slag.
On the other hand, the dephosphorization thermodynamics in relation to steel liquid, especially dephosphorization of molten iron thermodynamics, metallargists have been done
Many research work, form the Research Thinking of a set of maturation, a series of experience and semiempirical formula have been obtained, for referring to
Practice production is led, the wherein Healy formula of dephosphorization slag system are currently most to be recognized：
Log (%P)/[%P]=0.072 [(%CaO)+0.3 (%MgO)+0.6 (%P2O5)+0.2 (%MnO)+1.2 (%
CaF2) -0.5 (%Al2O3)]+11570/T-10.52
The theory and practical phosphor partition ratio of climbing steel half steel converter dephosphorization are compared and analyzed using above-mentioned formula, managed
It is as shown in Figure 1 by the relationship between phosphor partition ratio and practical phosphor partition ratio, wherein the phosphorus point when straight line representation theory equilibrium state
Situation is matched, roundlet represents practical phosphor partition ratio situation, it can be seen that practical phosphor partition ratio is less than theoretical distribution ratio, table from figure
Bright converter finishing slag phosphorus content fails to reach theoretical equilibrium value, and converter terminal slag still has preferable dephosphorizing capacity.
The present invention is based on the studies above, propose cold conditions slag renewable resources semi-steel making technique, can make full use of cold conditions
A large amount of CaO, SiO in slag2, MgO, FeO etc. be beneficial to the ingredient of steel-making, and help to reduce the steel of convertor steelmaking process
Material consumption, finally significantly reduces production cost, step includes converter blanking, blowing and tapping, institute in actual use
The material for stating blanking includes half steel water, 3~7kg/t of lime steel, 4~8kg/t of dolomitic lime steel, 3~7kg/t of acid composite slag
Steel and cold conditions slag 27~31kg/t steel, wherein acid composite slag is to contain SiO2Slag making materials.
Specifically, the ingredient of the cold conditions slag is calculated in mass percent including CaO：35~55%, SiO2：8~20%,
MgO：5~15%, FeO：15~25%, Fe2O3：5~10%, MnO：5~10%, P：≤ 0.1%, S：≤ 0.5%, moisture：＜
1%, remaining is impurity.
Further, in order to reach better using effect, the cold conditions slag is subjected to Mechanical Crushing, is processed into granularity
For the block of 30~50mm.
Further, in order to reach better using effect, the fusing point of adjustment cold conditions slag is 1280~1350 DEG C.
Wherein, steel scrap can be also added in addition to half steel water in the raw material of semi-steel making simultaneously, half steel water of control before blowing
Ingredient is calculated in mass percent including C：3.2~4.1%, Si：0.015~0.030%, Mn：0.02~0.04%, P：0.06~
0.08%, S：≤ 0.015%, surplus is Fe and inevitable impurity.
Further, the charging temperature of half steel water of control is 1250~1360 DEG C.
Wherein, the CaO mass contents in the lime are 85~90%.
Wherein, it is 48~55% that the MgO mass contents in the dolomitic lime, which are 30~40%, CaO mass contents,.
Wherein, the SiO in the acid composite slag2Mass content is 45~55%.
Preferably, converter is packed into half steel water, cold conditions slag is added after starting blowing.
Preferably, 2/3rds cold conditions slag adds after blowing starts in 6min, remaining one third is cold
State slag adds in next 4min.
Preferably, after starting blowing by lime, dolomitic lime and the acid total dosage of composite fluxing medium 2/3rds
It is added in converter, being left the lime, dolomitic lime and acid composite fluxing medium of one third will add in smelting process in batches
It is complete.Add remaining lime, dolomitic lime and acid composite fluxing medium when clinker relatively enlivens, to ensure that clinker there are enough flowings
Property and desulfurization, dephosphorizing capacity, be left the lime of one third, dolomitic lime and acid composite fluxing medium mainly according to the change of converter
Scoriform state is added in batches, primarily to it is dry to avoid steelmaking process from returning.
Wherein, it in order to ensure that slag has good mobility, to achieve the purpose that quick dephosphorization, prevents from burning rifle, blowing
Oxygen flow be 30000Nm3/ h, ton steel oxygen consume 40~60Nm3, the oxygen lance nozzle of blowing is away from the basic rifle position of molten pool metal liquid level
1.4~1.6m, blow rifle position 1.4m~1.6m, opens and blows rifle position 1.8m, catch carbon rifle position 1.4m.
Steelmaking process, the control of first basicity of slag is 2.0~2.5, and the control of finishing slag basicity is 3.0~4.0, total blowing principle：
Fast Slag Melting, early slugging, clinker is active, and process does not return dry, not splash.
Steel in the present invention in t steel refers both to be obtained molten steel after smelting, with reference to embodiment to the present invention into traveling
One step explanation.
Embodiment 1
The steel of U75V steel grades is smelted in the 120 tons of converters of certain steel mill, it is 129t, steel scrap weight actually to enter stove half steel weight of molten iron
Amount is 5t, and tapping weight is 127t, and concrete operations are to be packed into half steel water and steel scrap after upper heat slag splashing,
Cold conditions slag is added to converter after starting blowing, then converter is added portionwise in lime, dolomitic lime and acid composite slag
In, wherein half steel hot metal composition and temperature conditions are as shown in table 1 below, and the auxiliary material amount and blowing oxygen quantity being actually added into are as shown in table 2, go out
Composition of steel and tapping temperature are as shown in table 3 below.Steelmaking process clinker is active, and has stronger dephosphorizing capacity, and tapping terminates to use
Conventional slag splashing technique, furnace wall dross is good, this stove smelts finishing slag basicity 3.45, and full iron is 17.5% in finishing slag, oxygen activity
It is 420ppm.
1 half steel hot metal composition (%) of table and charging temperature (DEG C)
| C | Si | Mn | P | S | Charging temperature |
| 3.84 | 0.02 | 0.03 | 0.075 | 0.012 | 1300 |
The 2 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
The tapping molten steel composition of table 3 (%) and tapping temperature (DEG C)
| C | Si | Mn | P | S | Tapping temperature |
| 0.06 | 0.023 | 0.03 | 0.011 | 0.010 | 1675 |
Embodiment 2
The steel of stb-32 steel grades is smelted in the 120 tons of converters of certain steel mill, it is 139.8t actually to enter stove half steel weight of molten iron, is given up
Steel weight is 4t, and tapping weight is 134t, and concrete operations are to be packed into half steel water after upper heat slag splashing and give up
Steel adds 2/3rds cold conditions slag after starting blowing, remaining one third cold conditions steel after blowing starts in 6min
Slag adds in next 4min, then lime, dolomitic lime and acid composite slag are added portionwise in converter, wherein half steel
Hot metal composition and temperature conditions are as shown in table 4 below, and the auxiliary material amount and blowing oxygen quantity being actually added into are as shown in table 5, go out composition of steel and go out
Steel temperature is as shown in table 6 below.Steelmaking process clinker is active, and has stronger dephosphorizing capacity, and tapping terminates to splash slag shield using conventional
Furnace technology, furnace wall dross is good, this stove smelts finishing slag basicity 3.56, and full iron is 18.4% in finishing slag, and oxygen activity is 460ppm.
4 half steel hot metal composition (%) of table and charging temperature (DEG C)
| C | Si | Mn | P | S | Charging temperature |
| 3.95 | 0.025 | 0.035 | 0.068 | 0.020 | 1280 |
The 5 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
The tapping molten steel composition of table 6 (%) and tapping temperature (DEG C)
| C | Si | Mn | P | S | Tapping temperature |
| 0.06 | 0.023 | 0.03 | 0.011 | 0.010 | 1675 |
Embodiment 3
The steel of Q345 steel grades is smelted in the 120 tons of converters of certain steel mill, it is 137t, steel scrap weight actually to enter stove half steel weight of molten iron
Amount is 5t, and tapping weight is 136.12t, and concrete operations are to be packed into half steel water after upper heat slag splashing and give up
Steel adds 2/3rds cold conditions slag after starting blowing, remaining one third cold conditions steel after blowing starts in 6min
Slag adds in next 4min, then 2/3rds of lime, dolomitic lime and the total dosage of acid composite fluxing medium are added
Into converter, lime, dolomitic lime and the acid composite fluxing medium of remaining one third will add in smelting process in batches,
Middle half steel hot metal composition and temperature conditions are as shown in table 7 below, and the auxiliary material amount and blowing oxygen quantity being actually added into are as shown in table 8, tapping at
Divide and tapping temperature is as shown in table 9 below.Steelmaking process clinker is active, has stronger dephosphorizing capacity, tapping to terminate to splash using conventional
Slag furnace retaining technique, furnace wall dross is good, this stove smelts finishing slag basicity 3.4, and full iron is 18.1% in finishing slag, and oxygen activity is
490ppm。
7 half steel hot metal composition (%) of table and charging temperature (DEG C)
| C | Si | Mn | P | S | Charging temperature |
| 3.81 | 0.03 | 0.04 | 0.065 | 0.011 | 1330 |
The 8 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
The tapping molten steel composition of table 9 (%) and tapping temperature (DEG C)
| C | Si | Mn | P | S | Tapping temperature |
| 0.08 | 0.02 | 0.03 | 0.010 | 0.011 | 1670 |
Comparative example
The steel of Q235 steel grades is smelted in the 120 tons of converters of certain steel mill, it is 130t, steel scrap weight actually to enter stove half steel weight of molten iron
Amount is 6t, and tapping weight is 125.12t, half steel hot metal composition and temperature conditions as shown in upper table 7, the auxiliary material amount that is actually added into and
Blowing oxygen quantity is as shown in table 10, goes out composition of steel and tapping temperature as shown in upper table 9.Smelting terminates, although molten steel composition meets steel grade
It is required that but need to consume a large amount of steelmaking ingredient, production cost wants high with respect to the present invention.
The 10 semi-steel making auxiliary material amount of being actually added into (kg) of table and practical blowing oxygen quantity (m3)
For another example, method using the present invention, steel-making lime in 2017, dolomitic lime, acid composite fluxing medium price point
Not Wei 513,363,390 yuan/t, cold conditions slag ton steel 8.668kg is added per stove steel according to theoretical, then pneumatic steelmaking major auxiliary burden
Lime+dolomitic lime+acidity composite fluxing medium dosage average out to 5764.06kg/ stoves；Heat is smelted relative to normal, mainly
Auxiliary material lime+dolomitic lime+acidity composite fluxing medium dosage average out to 6521.36kg/ stoves；It is more normal that cold conditions slag is added in converter
It smelts heat major auxiliary burden and averagely reduces 757.3kg/ stoves, ton steel supplementary product onsumption reduces 5.694kg/t steel, with every stove steel weight
130t/ stoves produce 5400000 tons of meters of steel per year, cold conditions slag heat cost are added：
Y1=(1152.8/1000*100+2046.2/1000*513+2269.4/1000*363+1448.5/1 000*390+
(2046.2+2269.4+1448.5)/(1-0.193)/1000*0.193*1800)/132=38.14 members/t steel
It is normal to smelt heat cost：
Y2=(2380.2/1000*513+2558.1/1000*363+1583.1/1000*390+ (2380.2+2558.1+
1583.1)/(1-0.184)/1000*0.184*1800)/132=41.01 members/t steel,
Then ton steel benefit Y=41.01-38.14=2.87 members/t steel.Based on the above, using the method for the present invention, it is contemplated that create
Benefit is 10,000,000 or more.
Claims (10)
1. cold conditions slag renewable resources semi-steel making technique includes the steps that converter blanking, blowing and tapping, feature exist
In：The material of the blanking includes half steel water, 3~7kg/t of lime steel, 4~8kg/t of dolomitic lime steel, acid compound slag making
3~7kg/t of agent steel and cold conditions slag 27~31kg/t steel, wherein acid composite fluxing medium is to mainly contain SiO2Slag making material
Material.
2. cold conditions slag renewable resources semi-steel making technique according to claim 1, it is characterised in that：The cold conditions slag
Ingredient be calculated in mass percent including CaO：35~55%, SiO2：8~20%, MgO：5~15%, FeO：15~25%,
Fe2O3：5~10%, MnO：5~10%, P：≤ 0.1%, S：≤ 0.5%, moisture：＜ 1%, remaining is impurity.
3. cold conditions slag renewable resources semi-steel making technique according to claim 1 or 2, it is characterised in that：The cold conditions
Slag granularity is 30~50mm, and fusing point is 1280~1350 DEG C.
4. according to claims 1 to 3 any one of them cold conditions slag renewable resources semi-steel making technique, it is characterised in that：Institute
The ingredient for stating half steel water is calculated in mass percent including C：3.2~4.1%, Si：0.015~0.030%, Mn：0.02~
0.04%, P：0.06~0.08%, S：≤ 0.015%, surplus is Fe and inevitable impurity.
5. according to Claims 1 to 4 any one of them cold conditions slag renewable resources semi-steel making technique, it is characterised in that：Institute
The charging temperature for stating half steel water is 1250~1360 DEG C.
6. according to Claims 1 to 5 any one of them cold conditions slag renewable resources semi-steel making technique, it is characterised in that at least
Meet it is following in one：
CaO mass contents in the lime are 85~90%；
MgO mass contents in the dolomitic lime are that 30~40%, CaO mass contents are 48~55%；
SiO in the acidity composite fluxing medium2Mass content is 45~55%.
7. according to claim 1~6 any one of them cold conditions slag renewable resources semi-steel making technique, it is characterised in that：Turn
Stove is packed into half steel water, and cold conditions slag is added after starting blowing.
8. according to claim 1~7 any one of them cold conditions slag renewable resources semi-steel making technique, it is characterised in that：Three
/ bis- cold conditions slag adds after blowing starts in 6min, and remaining one third cold conditions slag is in next 4min
It adds.
9. according to claim 1~8 any one of them cold conditions slag renewable resources semi-steel making technique, it is characterised in that：It opens
Begin to be added to 2/3rds of lime, dolomitic lime and the total dosage of acid composite fluxing medium in converter after blowing, is left three points
One of lime, dolomitic lime and acid composite fluxing medium will be added in smelting process in batches.
10. according to claim 1~9 any one of them cold conditions slag renewable resources semi-steel making technique, it is characterised in that：Institute
The oxygen flow for stating blowing is 30000Nm3/ h, ton steel oxygen consume 40~60Nm3, oxygen lance nozzle is away from the basic rifle position of molten pool metal liquid level
1.4~1.6m, blow rifle position 1.4m~1.6m, opens and blows rifle position 1.8m, catch carbon rifle position 1.4m.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113528739A (en) * | 2021-05-26 | 2021-10-22 | 唐山钢铁集团高强汽车板有限公司 | Method for calculating converter smelting end-point slag-steel phosphorus distribution ratio |
| CN114854930A (en) * | 2022-05-12 | 2022-08-05 | 河北荣信钢铁有限公司 | Cold slag slagging agent for converter steelmaking and use method thereof |
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| CN113528739A (en) * | 2021-05-26 | 2021-10-22 | 唐山钢铁集团高强汽车板有限公司 | Method for calculating converter smelting end-point slag-steel phosphorus distribution ratio |
| CN114854930A (en) * | 2022-05-12 | 2022-08-05 | 河北荣信钢铁有限公司 | Cold slag slagging agent for converter steelmaking and use method thereof |
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