CN114908223B - Converter smelting method utilizing high-titanium return material - Google Patents
Converter smelting method utilizing high-titanium return material Download PDFInfo
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- CN114908223B CN114908223B CN202210604414.XA CN202210604414A CN114908223B CN 114908223 B CN114908223 B CN 114908223B CN 202210604414 A CN202210604414 A CN 202210604414A CN 114908223 B CN114908223 B CN 114908223B
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- 239000000463 material Substances 0.000 title claims abstract description 50
- 239000010936 titanium Substances 0.000 title claims abstract description 50
- 229910052719 titanium Inorganic materials 0.000 title claims abstract description 44
- 238000003723 Smelting Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 85
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 74
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 74
- 239000001301 oxygen Substances 0.000 claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 52
- 239000010959 steel Substances 0.000 claims abstract description 52
- 238000007664 blowing Methods 0.000 claims abstract description 37
- 229910052751 metal Inorganic materials 0.000 claims abstract description 31
- 239000002184 metal Substances 0.000 claims abstract description 31
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 28
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 12
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 8
- 230000023556 desulfurization Effects 0.000 claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 7
- 230000004907 flux Effects 0.000 claims abstract description 7
- 239000000843 powder Substances 0.000 claims abstract description 7
- 238000005496 tempering Methods 0.000 claims abstract description 7
- 238000002161 passivation Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 14
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 8
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 8
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 8
- 239000001095 magnesium carbonate Substances 0.000 claims description 8
- 235000019738 Limestone Nutrition 0.000 claims description 6
- 239000006028 limestone Substances 0.000 claims description 6
- 229910004261 CaF 2 Inorganic materials 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 38
- 229910052742 iron Inorganic materials 0.000 description 20
- 239000006260 foam Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 150000001450 anions Chemical class 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005421 electrostatic potential Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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
- C21C5/32—Blowing from above
-
- 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 invention relates to a converter smelting method using high titanium return materials, 1) a hot metal ladle enters a desulfurization station to a blowing position, firstly, a hardening and tempering agent is sprayed into the hot metal ladle, and then, passivation lime powder is sprayed into the hot metal ladle to carry out slag skimming treatment; 2) Adding high titanium return materials and scrap steel into the converter; 3) In the earlier stage of converting, controlling the alkalinity of slag to be 3.0-3.3; adding flux into a converter: oxygen lance position is 2.2-2.4m, oxygen blowing is 1.5-2.5min, and oxygen supply strength is 3.5-4.0m 3 And (3) adjusting the lance position of the oxygen lance to 2.4-2.6m; 4) In the middle stage of converting, the oxygen lance position is 2.0-2.2m, oxygen is blown for 2-3min, and oxygen supply intensity is 3.0-3.5m 3 And (3) t.h, when the slag surface reaches 300-500mm of the lower edge of the furnace mouth, the gun position is reduced to 1.5-1.7m, the total amount of the slag materials is 0.15-0.25kg/t steel pressed slag material which is added for 3-4 times, the addition amount of the slag materials is not more than 0.06kg/t steel, when the slag surface reaches 1500-1700mm of the lower edge of the furnace mouth, the gun position is adjusted to 1.7-1.9m, and oxygen is continuously blown for 6-8min; the invention can obviously reduce the phenomenon of easy splashing in the converter smelting process by utilizing the high-titanium return material.
Description
Technical Field
The invention relates to converter smelting, in particular to a converter smelting method utilizing high-titanium return materials.
Background
Scrap is an iron resource that does not require reducing energy as opposed to iron ore. The use amount of the scrap steel is increased to save 4
Energy source and also can reduce CO 2 Is formed and discharged. The utilization of the high titanium return material brings a plurality of adverse effects to converter smelting. With the melting of the high titanium return material, the Ti content in the molten steel is increased, and the Ti in the molten steel is the element which is oxidized firstly in the converter smelting process, and has the characteristics of small particle radius and large electrostatic potential, and meanwhile, the oxide (TiO 2 ) Is acidic in slag, so TiO 2 O easily released from alkaline oxides in slag 2- Combine to generate composite anion TiO 4 4- 、Ti 2 O 7 6- . These anions combine into larger groups of anions, increasing slag viscosity and releasing a large amount of heat. Therefore, the high titanium return material is easy to splash when molten iron is added into the converter, so that the environment is polluted, equipment is damaged, the consumption of steel materials is increased, the production rhythm is severely restricted, and personal injury is brought.
Disclosure of Invention
The invention aims to solve the technical problems that
The splashing rate of the converter for smelting the high-titanium molten steel is effectively reduced, the consumption of steel and iron materials is saved, and the smooth production is ensured.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a converter smelting method utilizing high-titanium return materials comprises the following steps:
1) The hot-metal ladle enters a desulfurization station to a blowing position, firstly, a hardening and tempering agent is sprayed into the hot-metal ladle according to the steel of 0.4-0.6kg/t, and then, the sprayed amount of passivation lime powder is sprayed into the hot-metal ladle to 0.4-0.5kg/t of steel, so that slag skimming treatment is carried out;
2) Adding high titanium return materials into the converter according to the proportion of 60-80kg/t steel, and adding scrap steel according to the proportion of 40-60kg/t steel;
3) In the earlier stage of converting, controlling the alkalinity of slag to be 3.0-3.3; adding flux into a converter: the addition amount is 30-35kg/t steel of lime, 8-10kg/t steel of magnesite, 8-10kg/t steel of limestone, 2.2-2.4m of oxygen lance position, 1.5-2.5min of oxygen blowing and 3.5-4.0m of oxygen supply strength 3 And (3) adjusting the lance position of the oxygen lance to 2.4-2.6m;
4) Mid-converting periodOxygen lance position is 2.0-2.2m, oxygen blowing is 2-3min, and oxygen supply strength is 3.0-3.5m 3 And (3) t.h, when the slag surface reaches 300-500mm of the lower edge of the furnace mouth, the gun position is reduced to 1.5-1.7m, the total amount of the slag materials is 0.15-0.25kg/t steel pressed slag material which is added for 3-4 times, the addition amount of the slag materials is not more than 0.06kg/t steel, when the slag surface reaches 1500-1700mm of the lower edge of the furnace mouth, the gun position is adjusted to 1.7-1.9m, and oxygen is continuously blown for 6-8min;
5) In the later stage of blowing, the oxygen lance slowly descends to 1.2-1.4m, oxygen is blown for 1-2min, and oxygen supply intensity is 3.0-3.5m 3 /t·h；
The components of the conditioner are NaF:8-10%; na (Na) 2 CO 3 +BaCO 3 ：8-12％；SiO 2 ：35-40％；CaF 2 ：40-50％；
The Ti content in the high-titanium return material is as follows: 0.4% -1.5%;
the size of the high titanium return material is 380-500mm 80-150mm.
The slag pressing material comprises the following components: 75-85%, caO:10-15%, and the balance FeO.
Compared with the prior art, the invention has the beneficial effects that:
utilizes the phenomenon that the high titanium return material is easy to splash in the converter smelting process,
the invention can obviously reduce the phenomenon of easy splashing in the converter smelting process by utilizing the high-titanium return material, and the hardening and tempering agent is added before slag skimming of molten iron, so that the viscosity of molten iron slag is reduced, the problems of difficult slag-iron separation, liquid level crust formation, slag sticking at the mouth of a molten iron tank and the like are solved, and the molten iron entering the converter meets the smelting requirement. In the earlier stage of blowing, the stirring force is properly reduced by lowering the gun, so that the gun is lifted before the reaction period of C-O, and the violent reaction is avoided. In the middle of converting, when foam slag is rich, a slag pressing material is added at a low gun position for operation, and foam slag splashing is restrained by consuming FeO in the slag. After the metal splash is relaxed, the gun is properly lifted to avoid the metal splash caused by the back drying. The speed of the pressure gun is slowed down in the later period of blowing, the molten steel composition and the temperature of the molten pool are uniform, the flame is stabilized, the terminal point is conveniently and accurately controlled, and the splash is avoided. The method has low cost and simple operation, can not damage equipment and has no potential safety hazard.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
A converter smelting method utilizing high-titanium return materials comprises the following steps:
1) The hot-metal ladle enters a desulfurization station to a blowing position, firstly, a hardening and tempering agent is sprayed into the hot-metal ladle according to the steel of 0.4-0.6kg/t, the viscosity of molten slag is reduced, and then, the sprayed amount of passivation lime powder is sprayed into the hot-metal ladle to 0.4-0.5kg/t of steel, so that slag skimming treatment is carried out; the components of the conditioner are NaF:8-10%; na (Na) 2 CO 3 +BaCO 3 ：8-12％；SiO 2 ：35-40％；CaF 2 ：40-50％；
2) Adding high titanium return materials into the converter according to the proportion of 60-80kg/t steel, and adding scrap steel according to the proportion of 40-60kg/t steel; ti content in the high titanium return material: 0.4% -1.5%; the size of the high titanium return material is 380-500mm 80-150mm.
3) In the earlier stage of converting, controlling the alkalinity of slag to be 3.0-3.3; adding flux into a converter: the addition amount is 30-35kg/t steel of lime, 8-10kg/t steel of magnesite, 8-10kg/t steel of limestone, 2.2-2.4m of oxygen lance position, 1.5-2.5min of oxygen blowing and 3.5-4.0m of oxygen supply strength 3 And (t.h), lifting stirring force, rapidly forming slag, and then adjusting the lance position of the oxygen lance to 2.4-2.6m;
4) In the middle stage of converting, the oxygen lance position is 2.0-2.2m, oxygen is blown for 2-3min, and oxygen supply intensity is 3.0-3.5m 3 And (3) t.h, when the slag is rich and the slag surface reaches 300-500mm below the furnace mouth, the gun position is lowered to 1.5-1.7m, and the steel slag pressing materials with the total amount of 0.15-0.25kg/t are added for 3-4 times, wherein the components of the slag pressing materials are MgO:75-85%, caO:10-15%, and the balance FeO. The adding amount of steel is not more than 0.06kg/t each time, foam slag splashing is restrained by consuming FeO in slag, when foam slag is relaxed, the slag surface reaches 1500-1700mm below the furnace mouth, the gun position is adjusted to 1.7-1.9m, and oxygen is continuously blown for 6-8min in the process;
5) After blowingThe oxygen lance position is reduced to 1.2-1.4m, oxygen is blown for 1-2min, and the oxygen supply strength is 3.0-3.5m 3 /(t.h); avoiding splashing caused by too high gun pressing speed.
Molten iron has high-melting-point substances such as Ti (N, C) and the like precipitated during transportation, the fluidity of slag is deteriorated, and the melting temperature is increased. The slag and iron separation is difficult due to poor fluidity of slag in the desulfurization temperature range, and the slag-removing iron loss is high. The modifier is added before the slag skimming of the molten iron, the viscosity of the molten iron slag is reduced, the problems of difficult slag-iron separation, liquid level crust formation, slag sticking at the mouth of a molten iron tank and the like are solved,
the high titanium return material is added into the converter, and the gun is required to be lowered to lift the stirring force in the early stage of blowing due to no bottom blowing effect, so that the gun is lifted to avoid severe reaction before the reaction period of C-O. Because the high titanium molten iron has the characteristics that foam slag is easy to form, and a slag layer is difficult to break under the action of bottom blowing, slag pressing materials are added at a low gun position for operation when the foam slag is rich in blowing in the middle period, and the foam slag splashing is restrained by consuming FeO in the slag. After the metal splash is relaxed, the gun is properly lifted to avoid the metal splash caused by the back drying. P, S is continuously removed in the later period of blowing, the oxidizing property and the fluidity of slag are well regulated, the purpose is to uniformly mix the molten steel components and the temperature of a molten pool, stabilize flame, and facilitate accurate control of the end point. At this time, the speed of the gun is slowed down to avoid splashing. The method does not increase smelting time, has cheap raw materials and simple and easy operation.
Because the modifier is added before slag skimming of molten iron, molten iron entering a furnace meets smelting requirements, a large amount of CO gas is prevented from rising to a furnace mouth rapidly by controlling the lance position of an oxygen lance in the early stage of blowing, and foam slag splashing and metal splashing are prevented by controlling the content of FeO in slag through controlling the lance position of the oxygen lance and adding slag pressing materials in the middle stage of blowing. The speed of the pressure gun is slowed down in the later period of blowing, the end point is accurately controlled, and the problem of smelting splashing of the high-titanium return converter is solved.
And (3) carrying out a 2-furnace test on the SPHC steel grade, and carrying out a comparison test with a 1-furnace steel grade, wherein the nominal of the converter is 260t.
Example 1:
a converter smelting method utilizing high-titanium return materials comprises the following steps:
1) After entering a desulfurization station, the hot-metal ladle is opened to a blowing position, 0.5kg/t of hardening and tempering agent is sprayed into the hot-metal ladle, and then 0.5kg/t of passivated lime powder is sprayed into the hot-metal ladle to carry out slag skimming treatment. The components of the conditioner are NaF:10% (Na) 2 CO 3 +BaCO 3 )：10％、SiO 2 ：40％、CaF 2 ：40％。
2) 80kg/t of high-titanium steel return materials and 40kg/t of steel scrap are added into the converter; titanium content of high titanium return: 1.2% high titanium return size 400mm x 100mm.
3) In the earlier stage of converting, the alkalinity of slag is controlled at 3.2. The converter flux is added with 30kg/t of lime, 8kg/t of magnesite, and 8kg/t of limestone. Oxygen lance position 2.2m, oxygen blowing 2min, oxygen supply strength 3.5m 3 And (3) t.h, improving stirring force, rapidly forming slag, and then enabling the lance position of the oxygen lance to be 2.4m, so as to avoid explosive splashing caused by severe reaction.
4) In the middle period of converting, the lance position of the oxygen lance is 2.0m, oxygen is blown for 2min, and the oxygen supply intensity is 3.0m 3 And (3) when the slag is rich, the lance position of the oxygen lance is 1.5m when the slag surface reaches 300mm below the furnace mouth, adding 0.21kg/t of steel slag pressing materials in 3 times, and adding not more than 0.07kg/t of steel each time, wherein when the slag surface reaches 1500mm below the furnace mouth, the lance position is increased to 1.6m, and avoiding metal splash caused by back drying. This process was continued with oxygen blowing for 7min. The slag pressing material comprises the following components: 80%, caO:10% and the balance FeO.
5) In the later stage of blowing, the oxygen lance slowly descends to 1.2m, oxygen is blown for 1.5min, and the oxygen supply intensity is 3.0m 3 And/t.h, avoiding splashing caused by too high gun pressing speed.
The results show that: foam slag is always present in the whole smelting process, and no splashing phenomenon exists.
Example 2:
a converter smelting method utilizing high-titanium return materials comprises the following steps:
1) After entering a desulfurization station, the hot-metal ladle is opened to a blowing position, 0.46kg/t of hardening and tempering agent is sprayed into the hot-metal ladle, and then 0.45kg/t of passivated lime powder is sprayed into the hot-metal ladle to carry out slag skimming treatment. The components of the conditioner are NaF:8% (Na) 2 CO 3 +BaCO 3 )：12％、SiO 2 ：35％、CaF 2 ：45％。
2) 70kg/t of high titanium return material and 50kg/t of normal scrap steel are added into the converter. Titanium content of high titanium return: 1.0% high titanium return size is 450mm x (80) mm x 80mm.
3) In the earlier stage of converting, the alkalinity of slag is controlled at 3.0. The converter flux is added with 35kg/t of lime, 10kg/t of magnesite, and 10kg/t of limestone. Oxygen lance position is 2.4m, oxygen blowing is 1.5min, and oxygen supply strength is 4.0m 3 And (3) t.h, improving stirring force, rapidly forming slag, and then enabling the lance position of the oxygen lance to be 2.6m, so as to avoid explosive splashing caused by severe reaction.
4) In the middle period of converting, the lance position of the oxygen lance is 2.2m, oxygen is blown for 2.5min, and the oxygen supply strength is 3.3m 3 And when the slag surface reaches 1600mm from the lower edge of the furnace mouth, the gun position is 1.8m, and metal splash caused by back drying is avoided. The process was continued with oxygen blowing for 6min. The slag pressing material comprises the following components: 75%, caO:15% and the balance FeO.
5) In the later stage of blowing, the lance position of the oxygen lance slowly drops to 1.3m, oxygen is blown for 2min, and the oxygen supply strength is 3.0m 3 /(t.h). Avoiding splashing caused by too high gun pressing speed.
The results show that: foam slag is always present in the whole smelting process, and no splashing phenomenon exists.
Comparative example:
a converter smelting method utilizing high-titanium return materials comprises the following steps:
1) After entering the desulfurization station, the hot metal ladle is opened to a blowing position, 0.5kg/t of passivated lime powder is sprayed into the hot metal ladle, slag skimming treatment is carried out, and slag sticking of a slag skimming plate is serious.
2) A high titanium return of 65kg/t steel and a scrap of 45kg/t steel were added to the converter. Titanium content of high titanium return: 1.0% high titanium return material size is 380mm 90mm.
3) In the earlier stage of converting, the alkalinity of slag is controlled at 3.2. Lime 30kg/t steel, magnesite 8.5kg/t steel and limestone 9kg/t steel are added into the converter flux. Oxygen lance position 2.1m, oxygen blowing 2min, oxygen supply strength 4.0m 3 /t·h，And the stirring force is improved, and slag is formed rapidly. When the mixture is blown for 3.4min, low-temperature foam splash occurs, and 0.4kg/t lime and 0.2kg/t magnesite are added.
4) In the middle period of converting, the lance position of the oxygen lance is 2.3m, the oxygen blowing time is 2.5min, and the oxygen supply strength is 3.0m 3 And (3) increasing the FeO content in the slag per t.h, converting to 6.5min to generate metal splash, adding 0.4kg/t of lime and 0.4kg/t of magnesite, and lowering the gun position. Blowing for 7.0min, thickening slag, and not completely covering the metal liquid level, and increasing the gun position by 2.5m.
5) In the later stage of blowing, the lance position of the oxygen lance is 1.3m, oxygen blowing is carried out for 2min, and the oxygen supply intensity is 3.5m 3 /t·h。
The results show that: in the whole smelting process, slag sticking of a slag skimming plate in molten iron pretreatment is serious, low-temperature foam splashing occurs in the early stage of blowing, slag thickening occurs immediately after metal splashing occurs in the middle stage of blowing, and the metal liquid level cannot be completely covered.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The converter smelting method using the high-titanium return material is characterized by comprising the following steps of:
1) The hot-metal ladle enters a desulfurization station to a blowing position, firstly, a hardening and tempering agent is sprayed into the hot-metal ladle according to the steel of 0.4-0.6kg/t, then passivation lime powder is sprayed into the hot-metal ladle, and slag skimming treatment is carried out on the steel of 0.4-0.5 kg/t; the components of the conditioner are NaF:8-10%; na (Na) 2 CO 3 +BaCO 3 ：8-12%；SiO 2 ：35-40%；CaF 2 ：40-50%；
2) Adding high titanium return materials into the converter according to the proportion of 60-80kg/t steel, and adding scrap steel according to the proportion of 40-60kg/t steel;
3) In the earlier stage of converting, controlling the alkalinity of slag to be 3.0-3.3; adding flux into a converter: the addition amount is 30-35kg/t steel of lime, 8-10kg/t steel of magnesite and 8-10kg/t steel of limestone, the lance position of the oxygen lance is 2.2-2.4m, the oxygen blowing is 1.5-2.5min, the oxygen supply strength is 3.5-4.0 m/t.h, and then the lance position of the oxygen lance is adjusted to 2.4-2.6m;
4) In the middle of converting, the lance position of an oxygen lance is 2.0-2.2m, oxygen is blown for 2-3min, the oxygen supply intensity is 3.0-3.5 m/t.h, when the slag surface reaches 300-500mm below the furnace mouth, the lance position is lowered to 1.5-1.7m, the total amount of 0.15-0.25kg/t of steel slag pressing materials is added for 3-4 times, the addition amount of each time is not more than 0.06kg/t of steel, when the slag surface reaches 1500-1700mm below the furnace mouth, the lance position is adjusted to 1.7-1.9m, and the oxygen is blown continuously for 6-8min;
5) In the later stage of blowing, the oxygen lance slowly descends to 1.2-1.4m, oxygen is blown for 1-2min, and the oxygen supply intensity is 3.0-3.5 m/t.h.
2. The converter smelting process utilizing a high titanium return according to claim 1, wherein the high titanium return has a Ti content of: 0.4% -1.5%.
3. The converter smelting process utilizing high-titanium return material according to claim 1, wherein the high-titanium return material has a size of 380-500mm×80-150mm×80-150mm。
4. The converter smelting method using high titanium return material according to claim 1, wherein the slag pressing material comprises the following components: 75-85%, caO:10-15%, and the balance FeO.
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