CN101575658A - Oxygen top blown converter steel making method - Google Patents
Oxygen top blown converter steel making method Download PDFInfo
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- CN101575658A CN101575658A CNA2009101473603A CN200910147360A CN101575658A CN 101575658 A CN101575658 A CN 101575658A CN A2009101473603 A CNA2009101473603 A CN A2009101473603A CN 200910147360 A CN200910147360 A CN 200910147360A CN 101575658 A CN101575658 A CN 101575658A
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Abstract
The invention relates to an oxygen top blown converter steel making method, comprising the following steps: the steel material is added to a converter, oxygen is blown into the converter by an oxygen lance and auxiliary materials are added into the furnace by stages; the method is characterized in that steel material comprises molten iron containing vanadium and titanium; lance position of the oxygen lance moves within 1.35-2.2m above molten steel liquid surface in the converter, wherein blowing beginning lance position is 1.9-2.1m, blowing lance position is 1.4-1.8m and catch carbon lance position is 1.35-1.45m; wherein the auxiliary materials comprise compound slag, lime and high-magnesium lime relative to every ton of molten iron containing vanadium and titanium, the first batch of auxiliary materials are added when the oxygen blowing content is 0.5-3.5%; the method of the invention is suitable for smelting low-level steel grade which has undemanding requirements on P and S by vanadium-and-titanium-containing molten iron which has relatively high content of P and relatively low content of S after being pretreated. The method can effectively lower consumption of auxiliary materials for molten iron smelting in Panxi Area, shortens smelting time and improves metal yield.
Description
Technical field
The present invention relates to a kind of method of oxygen top blown converter steel making.
Background technology
For common molten iron-steelmaking, static control method is terminal point composition and the temperature according to known starting material condition and blowing steel grade, calculates the method for the add-on of molten iron, steel scrap, refrigerant, slag charge, iron alloy and oxygen-supplying amount according to material balance and heat balance principle.Compare with common molten iron, the Panxi Diqu molten iron contains vanadium, titanium is higher, contains vanadium-titanium-iron-water steel-making and has the characteristics of himself.In the smelting of conventional molten iron, slag is the multicomponent system of a complexity, except CaO, SiO
2Outside FeO, also have MnO, Al
2O
3, component such as MgO, MnO, Al
2O
3, component such as MgO makes slag melting reduce, and slagging and slow down and return dried generation mid-term as early as possible.And for the smelting of Panxi Diqu molten iron, silicon, manganese content are fewer, need the acid slag making material of extra interpolation, and slagging is than later.And the high molten iron viscosity of titaniferous is big, and sticking easily rifle, sticking jar influences the life-span and the normal operation of equipment.If still smelt with ordinary method, slag then is the CaO-FeO system substantially.Its result will cause because to remove the slag making time that phosphorus, sulphur difficulty causes long, and slagging is slow, thereby causes easily sticking rifle, glue a series of serious problems such as fire door.
Summary of the invention
The smelting process that the objective of the invention is to overcome conventional molten iron makes long shortcoming of slag making time in the Panxi Diqu convertor steelmaking process provides short converter steel making method of a kind of slag making time.
The invention provides a kind of method of oxygen top blown converter steel making, this method comprises the steel raw material is added in the converter, by oxygen rifle oxygen blast gas in converter, and adds auxiliary material in the oxygen blast process in converter in batches, and wherein, described steel raw material contains the molten iron that contains the vanadium titanium; The rifle position of described oxygen rifle in converter liquid steel level above move in the scope of 1.35-2.2 rice, wherein, open that to blow the rifle position be 1.9-2.1 rice, blowing rifle position is a 1.4-1.8 rice, catch carbon rifle position is a 1.35-1.45 rice; Described auxiliary material comprises composite slag, lime and high magnesium lime, and with respect to the molten iron that contains the vanadium titanium per ton, the consumption of composite slag is the 5-8 kilogram, and the consumption of lime is the 14-19 kilogram, and the consumption of high magnesium lime is the 25-30 kilogram, and the total amount that is blown into oxygen is the 40-50 cubic meter; With the total amount that is blown into oxygen is benchmark, when blowing oxygen quantity is 0.5-3.5%, add first auxiliary material, described first auxiliary material comprises the composite slag of the 40-60 weight % of the high magnesium lime of 60-75 weight % of lime, high magnesium lime total amount of the 60-75 weight % of lime total amount and composite slag total amount, and described composite slag is for being benchmark SiO with its gross weight
2Content be the composite fluxing medium of 40-70 weight %.
In the method for oxygen top blown converter steel making of the present invention, owing to adopt little quantity of slag steel-making, thus shorten the slag making time, and reduced the consumption of slag charge and metal charge, not only reduced production cost, and shortened the time of smelting, improved the operating rate of converter and throughput and.Method provided by the invention is applicable to smelts through P height after the pre-treatment, the molten iron that contains the vanadium titanium that S is low, produces the less demanding low level steel grade to P, S.Method of the present invention can reduce effectively the Panxi Diqu molten iron smelting supplementary product onsumption, shorten the heat, improve recovery rate of iron.
Description of drawings
Fig. 1 represents the rifle position of embodiment of the invention 1-3 and the graph of a relation of blowing oxygen quantity.
Embodiment
The method of oxygen top blown converter steel making provided by the invention comprises the steel raw material is added in the converter, by oxygen rifle oxygen blast gas in converter, and adds auxiliary material in the oxygen blast process in converter in batches, and wherein, described steel raw material contains the molten iron that contains the vanadium titanium; The rifle position of described oxygen rifle in converter liquid steel level above move in the scope of 1.35-2.2 rice, wherein, open that to blow the rifle position be 1.9-2.1 rice, blowing rifle position is a 1.4-1.8 rice, catch carbon rifle position is a 1.35-1.45 rice; Described auxiliary material comprises composite slag, lime and high magnesium lime, and with respect to the molten iron that contains the vanadium titanium per ton, the consumption of composite slag is the 5-8 kilogram, and the consumption of lime is the 14-19 kilogram, and the consumption of high magnesium lime is the 25-30 kilogram, and the total amount that is blown into oxygen is the 40-50 cubic meter; With the total amount that is blown into oxygen is benchmark, when blowing oxygen quantity is 0.5-3.5%, add first auxiliary material, described first auxiliary material comprises the composite slag of the 40-60 weight % of the high magnesium lime of 60-75 weight % of lime, high magnesium lime total amount of the 60-75 weight % of lime total amount and composite slag total amount, and described composite slag is for being benchmark SiO with its gross weight
2Content be the composite fluxing medium of 40-70 weight %.
In the present invention, described oxygen rifle can be the various rifle shape things that are used for to molten steel or molten iron injection of oxygen, both can be the conventional oxygen rifle that uses in present this area, also can be other the oxygen rifle that can realize above-mentioned functions.For ease of explanation, below be that example illustrates the present invention with the conventional oxygen rifle that uses in this area.Described rifle position is meant before the lower-most point of shower nozzle of oxygen rifle and the oxygen blast distance of liquid steel level in the converter; Described opening blown the rifle position and is meant before the lower-most point of the shower nozzle of oxygen rifle when beginning is blown into oxygen in converter and the oxygen blast distance of liquid steel level in the converter; Described blowing rifle position is meant that oxygen lance blow head was apart from the distance of bath surface when converter was normally blown; Described catch carbon rifle position is meant bessemerizes the latter stage oxygen lance blow head apart from the distance of bath surface.
The method of oxygen top blown converter steel making of the present invention comprises the steel raw material is added in the converter, by oxygen rifle oxygen blast gas in converter, and adds auxiliary material in the oxygen blast process in converter in batches.Described steel raw material comprises the molten iron that contains the vanadium titanium, and usually the described molten iron that contains the vanadium titanium is meant the still higher steel raw material that contains the vanadium titanium of sulphur, phosphorus content that obtains through behind pre-treatment such as desulfurization, the dephosphorization.With the described total amount that contains the molten iron of vanadium titanium is benchmark, can contain the carbon of 4.1-4.6 weight %, the silicon of 0.15-0.3 weight %, the manganese of 0.2-0.5 weight %, the phosphorus of 0.06-0.08 weight %, the sulphur of 0.005-0.01 weight %, the titanium of 0.2-0.35 weight %, the vanadium of 0.2-0.35 weight % and the iron of 93-95 weight % in the described molten iron that contains the vanadium titanium.
According to method provided by the invention, the consumption of described auxiliary material and the total amount that is blown into oxygen can be made steel Model Calculation by static state and be gone out.Generally, described auxiliary material comprises composite slag, lime and high magnesium lime, and with respect to the molten iron that contains the vanadium titanium per ton, the consumption of composite slag can be the 5-8 kilogram, the consumption of lime can be the 14-19 kilogram, the consumption of high magnesium lime can be the 25-30 kilogram, and the total amount that is blown into oxygen can be the 40-50 cubic meter; Under the preferable case, with respect to the molten iron that contains the vanadium titanium per ton, the consumption of described composite slag is the 5.5-7.5 kilogram, and the consumption of described lime is the 14.8-18.5 kilogram, the consumption of described high magnesium lime is the 26-29.5 kilogram, and the described total amount that is blown into oxygen is the 43-48.3 cubic meter.
Wherein said composite slag is for being benchmark SiO with its gross weight
2Content be the composite fluxing medium of 40-70 weight %, described composite slag for example can be acid composite slag, SiO in described acid composite slag
2Content be generally 45-55 weight %, normally used acid composite slag for example can be quartz sand.Described lime and high magnesium lime are mainly used in sulphur and the phosphorus of sloughing in the hot metal composition.Described lime mainly contains CaO, and is benchmark with the gross weight of described lime, and the content of CaO is generally 85-90 weight %.Described high magnesium lime mainly contains MgO and CaO, is benchmark with the gross weight of described high magnesium lime, and the content of MgO is generally 30-40 weight %, and the content of CaO is generally 48-55 weight %.
In the process that is blown into oxygen in converter, the flow of oxygen can adopt and well known to a person skilled in the art parameter, for example 20000-30000 standard cubic meter (Nm
3)/hour.Under the preferable case, in oxygen blown initial stage and mid-term, with the flow control of oxygen be the 25000-30000 standard cubic meter/hour; Be benchmark with the total amount that is blown into oxygen, when blowing oxygen quantity is 89-90%, with the flow control of oxygen be 20000 standard cubic meter/hour to less than 25000 standard cubic meter/hour.Control the flow of oxygen in described preferred mode and can more accurately control steel-making terminal point composition and temperature.
In method for making steel of the present invention, the rifle position of described oxygen rifle can be in converter liquid steel level above move in the scope of 1.35-2.2 rice, particularly, will open and blow the rifle position and be controlled to be 1.9-2.1 rice, blowing rifle position is controlled to be 1.4-1.8 rice, and catch carbon rifle position is controlled to be 1.35-1.45 rice.Add auxiliary material in the oxygen blown while according to blowing oxygen quantity in batches, particularly, with the total amount that is blown into oxygen is benchmark, when blowing oxygen quantity is 0.5-3.5%, add first auxiliary material, described first auxiliary material comprises the composite slag of the 40-60 weight % of the high magnesium lime of 60-75 weight % of lime, high magnesium lime total amount of the 60-75 weight % of lime total amount and composite slag total amount.Can realize adopting the little quantity of slag to make steel by adopt aforesaid way to control the rifle position of oxygen rifle and add auxiliary material in batches, and can quicken the generation of slag according to blowing oxygen quantity.In the preferred case, the lot number that adds auxiliary material in the oxygen blast process in converter is that 3-8 criticizes, and with the total amount that is blown into oxygen is benchmark, when blowing oxygen quantity is 40-50%, add second batch of auxiliary material, described second batch of auxiliary material comprises the composite slag of the 15-25 weight % of the high magnesium lime of 8-20 weight % of lime, high magnesium lime total amount of the 8-20 weight % of lime total amount and composite slag total amount; When blowing oxygen quantity is 50-58%, add the 3rd batch of auxiliary material, described the 3rd batch of auxiliary material comprises the composite slag of the 20-40 weight % of the high magnesium lime of 8-15 weight % of lime, high magnesium lime total amount of the 8-15 weight % of lime total amount and composite slag total amount.
Under the further preferred situation, the rifle position of described oxygen rifle and the relation of blowing oxygen quantity are controlled to be: with the total amount that is blown into oxygen is benchmark, and when blowing oxygen quantity was 0-5%, the rifle position was a 1.9-2.1 rice; Blowing oxygen quantity is greater than 5% to 30% o'clock, and the rifle position is a 1.35-1.45 rice; Blowing oxygen quantity is greater than 30% to 40% o'clock, and the rifle position is a 1.55-1.7 rice; Blowing oxygen quantity is greater than 40% to 54% o'clock, and the rifle position is a 1.45-1.55 rice; Blowing oxygen quantity is greater than 54% to 62% o'clock, and the rifle position is a 1.65-1.8 rice; Blowing oxygen quantity is greater than 62% to 80% o'clock, and the rifle position is a 1.45-1.55 rice; Blowing oxygen quantity is greater than 80% to 100% o'clock, and the rifle position is a 1.3-1.45 rice.
Under the preferable case, when described auxiliary material divides 4 batches to add fashionable, the adition process of described auxiliary material and the relation of blowing oxygen quantity further preferably can be controlled to be: with the total amount that is blown into oxygen is benchmark, blowing oxygen quantity adds first auxiliary material during for 0.5-2%, and first auxiliary material comprises the composite slag of the 45-55 weight % of the high magnesium lime of 65-70 weight % of lime, high magnesium lime total amount of the 65-70 weight % of lime total amount and composite slag total amount; Blowing oxygen quantity adds second batch of auxiliary material during for 40-50%, and the second batch of auxiliary material comprises the composite slag of the 18-22 weight % of the high magnesium lime of 10-15 weight % of lime, high magnesium lime total amount of the 10-15 weight % of lime total amount and composite slag total amount; Blowing oxygen quantity adds the 3rd batch of auxiliary material during for 50-58%, and the 3rd batch of auxiliary material comprises the composite slag of the 25-35 weight % of the high magnesium lime of 9-13 weight % of lime, high magnesium lime total amount of the 9-13 weight % of lime total amount and composite slag total amount; Blowing oxygen quantity adds the 4th batch of auxiliary material during for 58-63%, and the 4th batch of auxiliary material comprises the high magnesium lime of the 8-12 weight % of the lime of 8-12 weight % of lime total amount and high magnesium lime total amount.
Under the most preferred case, can control rifle position and the adition process of described auxiliary material and the relation of blowing oxygen quantity of described oxygen rifle respectively simultaneously according to above-mentioned parameter.The method for making steel that meets above-mentioned preferable case more helps the quick generation of slag.
In the present invention, the plurality of raw materials in each batch auxiliary material can add respectively also and can add after the uniform mixing, can continous way add also and can add by intermittent type.
In order to make full use of steel scrap, make steel scrap obtain recycling and saving cost, in method for making steel of the present invention, except the molten iron that contains the vanadium titanium, the steel raw material that adds in the converter can also contain steel scrap, with respect to the molten iron that contains the vanadium titanium of 100 weight parts, the add-on of described steel scrap can be the 3-10 weight part.Described steel scrap is meant the iron and steel stock of scrapping, and when hot metal supply deficiency or steel scrap resource surplus, steel mill extensively adopts the technical measures that add steel scrap.Generally speaking, mainly consisting of in the steel scrap outside the deironing: C:0.03-0.75 weight %, Si:0.02-0.50 weight %, Mn:0.03-0.75 weight %, P:0.003-0.035 weight %, S:0.003-0.035 weight %.
In method for making steel of the present invention, the content of carbon is 3.7-4.2 weight % in the described molten iron that contains the vanadium titanium, and corresponding to the described molten iron that contains the vanadium titanium of per 100 weight parts, when the add-on of described steel scrap was the 6.5-10 weight part, described auxiliary material also comprised temperature raising agent.Described temperature raising agent is selected carbonaceous material usually for use, and for example class graphite and/or carburelant, described class graphite and carburelant can be conventional various types of graphite and the carburelant that uses in this area, and the carbon content of common described class graphite and carburelant is more than 85%.The consumption of described temperature raising agent is the 0.05-0.5 kilogram for heat 1 ℃ with respect to steel raw material per ton.Described temperature raising agent adds during for 0.5-2% at blowing oxygen quantity, and concrete add-on is decided according to the temperature of the required lifting of steel raw material in the steel melting furnace and the amount of steel raw material.For example, in steel melting furnace, contain 100 tons of steel raw materials, and need make steel raw material per ton promote 10 ℃ the time, then the consumption of temperature raising agent is 100 * 10 * (0.05-0.5)=50-500 kilogram.The calculating of the consumption of following refrigerant similarly.
In method for making steel of the present invention, the content of carbon is more than the 4.2 weight % in the described molten iron that contains the vanadium titanium, and corresponding to the described molten iron that contains the vanadium titanium of per 100 weight parts, the add-on of described steel scrap is 3 weight parts to less than 6.5 weight parts the time, and described auxiliary material also comprises refrigerant.Because ought describedly contain the content of carbon in the molten iron of vanadium titanium is more than the 4.2 weight %, and corresponding to the described molten iron that contains the vanadium titanium of per 100 weight parts, the add-on of described steel scrap is during less than 6.5 weight parts, there is heat situation more than needed in the steel-making system, therefore the refrigerant that can prevent that molten steel temperature is too high and can reduce molten steel temperature preferably is provided, described refrigerant for example can be sludge ball, and described sludge ball is the conventional sludge ball that uses in this area.The consumption of described refrigerant is to be the 0.05-0.5 kilogram for 1 ℃ with respect to steel raw material cooling per ton.Described refrigerant adds during for 77-82% at blowing oxygen quantity, and concrete add-on is decided according to the temperature of raw material in the steel melting furnace.
According to method provided by the invention, the process of described oxygen blown process and adding auxiliary material can realize automatic control by computer.
Below, will the invention will be further described by specific embodiment.In following examples, the content of CaO is 88 weight % in the lime; The content of MgO is 30 weight % in the high magnesium lime, and the content of CaO is 52 weight %; Composite slag is quartz sand, wherein SiO
2Content be 55 weight %.
Embodiment 1
Present embodiment is used to illustrate the method for oxygen top blown converter steel making provided by the invention.
To smelt in 148.93 tons of molten iron adding converters, wherein the composition of molten iron and charging temperature are as shown in table 1 below, then to wherein being blown into oxygen and adding auxiliary material, the gross weight of the auxiliary material of adding (lime, high magnesium lime and composite slag) and to be blown into the total amount of oxygen as shown in table 2.
The adding mode of auxiliary material and the corresponding relation of blowing oxygen quantity are: with the total amount that is blown into oxygen is benchmark, and blowing oxygen quantity is the composite slag of 50 weight % of the high magnesium lime of 67 weight % of the lime that added 67 weight % of lime total amount at 1% o'clock, high magnesium lime total amount and composite slag total amount; Blowing oxygen quantity is the composite slag of 20 weight % of the high magnesium lime of 12 weight % of the lime that added 12 weight % of lime total amount at 46% o'clock, high magnesium lime total amount and composite slag total amount; Blowing oxygen quantity is the composite slag of 30 weight % of the high magnesium lime of 11 weight % of the lime that added 11 weight % of lime total amount at 54% o'clock, high magnesium lime total amount and composite slag total amount; Blowing oxygen quantity is the high magnesium lime that added 12 weight % of the lime of 10 weight % of lime total amount and high magnesium lime total amount at 60% o'clock.
The rifle position of oxygen rifle is as shown in Figure 1: when blowing oxygen quantity was 0-5%, the rifle position was 2 meters; Blowing oxygen quantity is greater than 5 to 30% o'clock, and the rifle position is 1.4 meters; Blowing oxygen quantity is greater than 30 to 40% o'clock, and the rifle position is 1.6 meters; Blowing oxygen quantity is greater than 40 to 54% o'clock, and the rifle position is 1.5 meters; Blowing oxygen quantity is greater than 54 to 62% o'clock, and the rifle position is 1.7 meters; Blowing oxygen quantity is greater than 50 to 62% o'clock, and the rifle position is 1.7 meters; Blowing oxygen quantity is greater than 62 to 80% o'clock, and the rifle position is 1.5 meters; Blowing oxygen quantity is greater than 80 to 100% o'clock, and the rifle position is 1.4 meters.
From the beginning oxygen blast to blowing oxygen quantity is to be blown into 90% of amount of oxygen, the flow of oxygen be 30000 standard cubic meter/hour; Blowing oxygen quantity is after 90%, the flow of oxygen be 20000 standard cubic meter/hour.
Finally obtain molten steel and tap, wherein, the composition and the tapping temperature of tapping molten steel are as shown in table 3, and the weight of tapping is 138.43 tons, and the steel of refining is the U75 steel.
Table 1
| Fe | C | Si | Mn | P | S | V | Ti | Charging temperature/℃ | |
| Hot metal composition/weight % | 94.29 | 4.55 | 0.2 | 0.29 | 0.064 | 0.005 | 0.25 | 0.26 | 1290 |
Table 2
| Auxiliary material | Lime/kg | High magnesium lime/kg | Composite slag/kg | Be blown into the total amount/m of oxygen 3 |
| Add total amount | 3050 | 3794 | 300 | 7250 |
Table 3
| Fe | C | Si | Mn | P | S | V | Ti | Tapping temperature/℃ | |
| Tapping molten steel composition/weight % | 99.84 | 0.045 | 0.02 | 0.03 | 0.025 | 0.005 | 0.02 | 0.02 | 1690 |
The finishing slag basicity that this stove is smelted is 3.6, and full iron is 19.6 weight % in the finishing slag, and oxygen activity is 500ppm.In the present invention, the weight percentage of described full iron is represented the weight percentage of the ferro element that exists with various forms such as ferric oxide, iron protoxide and Z 250 form in the slag.In this stove steelmaking process, splash do not occur and return dried phenomenon, and, add from described half steel and promptly to form the slag that covers molten steel the converter after 2.5 minutes, shorten 0.5 minute than the method for making steel of routine.Adding converter from described half steel is 10 minutes to the used time of tapping, and the method time spent of the refining U75 steel more conventional than employing shortens 1 minute.
Embodiment 2
Present embodiment is used to illustrate the method for oxygen top blown converter steel making provided by the invention.
To smelt in 140.16 tons of molten iron adding converters, again to wherein adding 6.2 tons of steel scraps, wherein the charging temperature of the composition of molten iron and steel scrap and molten iron is as shown in table 4 below, then to wherein being blown into oxygen and adding auxiliary material, the auxiliary material of adding (lime, high magnesium lime, composite slag and sludge ball (produce by the converter mud of the finely powdered of the metallic iron that contains 45-50%)) gross weight and to be blown into the total amount of oxygen as shown in table 5.According to the wherein carbon content of molten iron and the add-on of steel scrap, adopt static steel-making model to go out to need to add refrigerant to 55 ℃ of steel-making system coolings by computer calculates.
The adding mode of auxiliary material and the corresponding relation of blowing oxygen quantity are: with the total amount that is blown into oxygen is benchmark, and blowing oxygen quantity is the high magnesium lime that added 70 weight % of the lime of 68 weight % of lime total amount and high magnesium lime total amount at 1% o'clock; Blowing oxygen quantity is the sludge ball that added 50 weight % of the composite slag of 45 weight % of composite slag total amount and sludge ball total amount at 2% o'clock; Blowing oxygen quantity is the composite slag of 22 weight % of the high magnesium lime of 10 weight % of the lime that added 15 weight % of lime total amount at 42% o'clock, high magnesium lime total amount and composite slag total amount; Blowing oxygen quantity is the sludge ball that added 50 weight % of the lime of 9 weight % of lime total amount and sludge ball total amount at 53% o'clock; Blowing oxygen quantity is the composite slag that added 33 weight % of the high magnesium lime of 10 weight % of high magnesium lime total amount and composite slag total amount at 56% o'clock; Blowing oxygen quantity is the high magnesium lime that added 10 weight % of the lime of 8 weight % of lime total amount and high magnesium lime total amount at 62% o'clock.
The rifle position of oxygen rifle is with embodiment 1, as shown in Figure 1.From the beginning oxygen blast to blowing oxygen quantity is to be blown into 90% of amount of oxygen, the flow of oxygen be 30000 standard cubic meter/hour; Blowing oxygen quantity is after 90%, the flow of oxygen be 20000 standard cubic meter/hour.Thereby obtain molten steel and tap, wherein, the composition and the tapping temperature of tapping molten steel are as shown in table 6, and the weight of tapping is 141.26 tons, and the steel of refining is the U71Mn steel.
Table 4
| Fe | C | Si | Mn | P | S | V | Ti | Charging temperature/℃ | |
| Hot metal composition/weight % | 93.85 | 4.567 | 0.294 | 0.307 | 0.07 | 0.01 | 0.296 | 0.299 | 1300 |
| Steel scrap composition/weight % | 99.29 | 0.10 | 0.20 | 0.30 | 0.008 | 0.004 | 0.05 | 0.04 | 30 |
Table 5
| Auxiliary material | Lime/kg | High magnesium lime/kg | Composite slag/kg | Sludge ball/kg | Be blown into the total amount/m of oxygen 3 |
| Total amount | 2985 | 4108 | 499 | 1376 | 6619 |
Table 6
| Fe | C | Si | Mn | P | S | V | Ti | Tapping temperature/℃ | |
| Tapping molten steel composition/weight % | 99.78 | 0.09 | 0.02 | 0.04 | 0.025 | 0.009 | 0.02 | 0.02 | 1685 |
The finishing slag basicity that this stove is smelted is 3.52, and full iron is 19.1 weight % in the finishing slag, and oxygen activity is 350ppm.In this stove steelmaking process, splash do not occur and return dried phenomenon, and, add from described half steel and promptly to form the slag that covers molten steel the converter after 3 minutes, shorten 0.6 minute than the method for making steel of routine.Adding converter from described half steel is 12 minutes to the used time of tapping, and the method time spent of the refining U71Mn steel more conventional than employing shortens 1.2 minutes.
Embodiment 3
Present embodiment is used to illustrate the method for oxygen top blown converter steel making provided by the invention.
To smelt in 132 tons of molten iron adding converters, again to wherein adding 6 tons of steel scraps, wherein the charging temperature of the composition of molten iron and steel scrap and molten iron is as shown in table 7 below, then to wherein being blown into oxygen and adding auxiliary material, the gross weight of the auxiliary material of adding (lime, high magnesite and composite slag) and to be blown into the total amount of oxygen as shown in table 8.
According to the wherein carbon content of molten iron and the add-on of steel scrap, adopt static steel-making model to go out to need to add refrigerant to 40 ℃ of steel-making system coolings by computer calculates.
The adding mode of auxiliary material and the corresponding relation of blowing oxygen quantity are: with the total amount that is blown into oxygen is benchmark, and blowing oxygen quantity is composite slag and 1000 kilograms of sludge balls as refrigerant of 52 weight % of high magnesium lime, the composite slag total amount of 65 weight % of the lime that added 70 weight % of lime total amount at 2% o'clock, high magnesium lime total amount; Blowing oxygen quantity is the composite slag of 18 weight % of the high magnesium lime of 12 weight % of the lime that added 10 weight % of lime total amount at 40% o'clock, high magnesium lime total amount and composite slag total amount; Blowing oxygen quantity is the composite slag of 30 weight % of the high magnesium lime of 12 weight % of the lime that added 10 weight % of lime total amount at 52% o'clock, high magnesium lime total amount and composite slag total amount; Blowing oxygen quantity is the high magnesium lime that added 11 weight % of the lime of 10 weight % of lime total amount and high magnesium lime total amount at 62% o'clock.
The rifle position of oxygen rifle as shown in Figure 1.From the beginning oxygen blast to blowing oxygen quantity is to be blown into 90% of amount of oxygen, the flow of oxygen be 30000 standard cubic meter/hour; Blowing oxygen quantity is after 90%, the flow of oxygen be 20000 standard cubic meter/hour.Thereby obtain molten steel and tap, wherein, the composition and the tapping temperature of tapping molten steel are as shown in table 9, and the weight of tapping is 131.2 tons, and the steel of refining is the steel of B1 steel grade.
Table 7
| Fe | C | Si | Mn | P | S | V | Ti | Charging temperature/℃ | |
| Hot metal composition/weight % | 94.05 | 4.29 | 0.022 | 0.012 | 0.072 | 0.008 | 0.015 | 0.02 | 1350 |
| Steel scrap composition/weight % | 98.75 | 0.25 | 0.45 | 0.50 | 0.004 | 0.003 | 0.02 | 0.02 | 30 |
Table 8
| Auxiliary material | Lime/kg | High magnesium lime/kg | Composite slag/kg | Sludge ball/kg | Be blown into the total amount/m of oxygen 3 |
| Add total amount | 3000 | 4090 | 400 | 1000 | 6700 |
Table 9
| Fe | C | Si | Mn | P | S | V | Ti | Tapping temperature/℃ | |
| Tapping molten steel composition/weight % | 99.79 | 0.08 | 0.02 | 0.025 | 0.027 | 0.01 | 0.018 | 0.018 | 1670 |
The finishing slag basicity that this stove is smelted is 3.42, and full iron is 18.9 weight % in the finishing slag, and oxygen activity is 450ppm.In this stove steelmaking process, splash do not occur and return dried phenomenon, and, add from described half steel and promptly to form the slag that covers molten steel the converter after 3 minutes, shorten 0.45 minute than the method for making steel of routine.Adding converter from described half steel is 14 minutes to the used time of tapping, and the method time spent of the refining B1 steel more conventional than employing shortens 0.5 minute.
This shows, adopt the method for oxygen top blown converter steel making provided by the invention, can form the slag that covers molten steel fast, thereby shortened the time of steel-making, and in steelmaking process, effectively avoided splash and returned the generation of doing phenomenon.
Claims (15)
1, a kind of method of oxygen top blown converter steel making, this method comprise the steel raw material are added in the converter, by oxygen rifle oxygen blast gas in converter, and add auxiliary material in the oxygen blast process in converter in batches, it is characterized in that described steel raw material contains the molten iron that contains the vanadium titanium; The rifle position of described oxygen rifle in converter liquid steel level above move in the scope of 1.35-2.2 rice, wherein, open that to blow the rifle position be 1.9-2.1 rice, blowing rifle position is a 1.4-1.8 rice, catch carbon rifle position is a 1.35-1.45 rice; Described auxiliary material comprises composite slag, lime and high magnesium lime, and with respect to the molten iron that contains the vanadium titanium per ton, the consumption of composite slag is the 5-8 kilogram, and the consumption of lime is the 14-19 kilogram, and the consumption of high magnesium lime is the 25-30 kilogram, and the total amount that is blown into oxygen is the 40-50 cubic meter; With the total amount that is blown into oxygen is benchmark, when blowing oxygen quantity is 0.5-3.5%, add first auxiliary material, described first auxiliary material comprises the composite slag of the 40-60 weight % of the high magnesium lime of 60-75 weight % of lime, high magnesium lime total amount of the 60-75 weight % of lime total amount and composite slag total amount, and described composite slag is for being benchmark SiO with its gross weight
2Content be the composite fluxing medium of 40-70 weight %.
2, method according to claim 1, wherein, with respect to molten iron per ton, the consumption of described composite slag is the 5.5-7.5 kilogram, and the consumption of described lime is the 14.8-18.5 kilogram, and the consumption of described high magnesium lime is the 26-29.5 kilogram.
3, method according to claim 1, wherein, the described molten iron that contains the vanadium titanium contains the carbon of 4.1-4.6 weight %, the silicon of 0.15-0.3 weight %, the manganese of 0.2-0.5 weight %, the phosphorus of 0.06-0.08 weight %, the sulphur of 0.005-0.01 weight %, the titanium of 0.2-0.35 weight %, the vanadium of 0.2-0.35 weight % and the iron of 93-95 weight %.
4, method according to claim 1, wherein, the rifle position of described oxygen rifle and the pass of blowing oxygen quantity are: with the total amount that is blown into oxygen is benchmark, when blowing oxygen quantity was 0-5%, the rifle position was a 1.9-2.1 rice; Blowing oxygen quantity is greater than 5% to 30% o'clock, and the rifle position is a 1.35-1.45 rice; Blowing oxygen quantity is greater than 30% to 40% o'clock, and the rifle position is a 1.55-1.7 rice; Blowing oxygen quantity is greater than 40% to 54% o'clock, and the rifle position is a 1.45-1.55 rice; Blowing oxygen quantity is greater than 54% to 62% o'clock, and the rifle position is a 1.65-1.8 rice; Blowing oxygen quantity is greater than 62% to 80% o'clock, and the rifle position is a 1.45-1.55 rice; Blowing oxygen quantity is greater than 80% to 100% o'clock, and the rifle position is a 1.3-1.45 rice.
5, method according to claim 1, wherein, the lot number that adds auxiliary material in the oxygen blast process in converter is 3-8, and with the total amount that is blown into oxygen is benchmark, when blowing oxygen quantity is 40-50%, add second batch of auxiliary material, described second batch of auxiliary material comprises the composite slag of the 15-25 weight % of the high magnesium lime of 8-20 weight % of lime, high magnesium lime total amount of the 8-20 weight % of lime total amount and composite slag total amount; When blowing oxygen quantity is 50-58%, add the 3rd batch of auxiliary material, described the 3rd batch of auxiliary material comprises the composite slag of the 20-40 weight % of the high magnesium lime of 8-15 weight % of lime, high magnesium lime total amount of the 8-15 weight % of lime total amount and composite slag total amount.
6, method according to claim 5, wherein, the lot number that adds auxiliary material in the oxygen blast process in converter is 4, the adition process of described auxiliary material and the pass of blowing oxygen quantity are: with the total amount that is blown into oxygen is benchmark, blowing oxygen quantity adds first auxiliary material during for 0.5-2%, and first auxiliary material comprises the composite slag of the 45-55 weight % of the high magnesium lime of 65-70 weight % of lime, high magnesium lime total amount of the 65-70 weight % of lime total amount and composite slag total amount; Blowing oxygen quantity adds second batch of auxiliary material during for 40-50%, and the second batch of auxiliary material comprises the composite slag of the 18-22 weight % of the high magnesium lime of 10-15 weight % of lime, high magnesium lime total amount of the 10-15 weight % of lime total amount and composite slag total amount; Blowing oxygen quantity adds the 3rd batch of auxiliary material during for 50-58%, and the 3rd batch of auxiliary material comprises the composite slag of the 25-35 weight % of the high magnesium lime of 9-13 weight % of lime, high magnesium lime total amount of the 9-13 weight % of lime total amount and composite slag total amount; Blowing oxygen quantity adds the 4th batch of auxiliary material during for 58-63%, and the 4th batch of auxiliary material comprises the high magnesium lime of the 8-12 weight % of the lime of 8-12 weight % of lime total amount and high magnesium lime total amount.
7, according to any described method among the claim 1-6, wherein, described steel raw material also contains steel scrap, and with respect to the molten iron that contains the vanadium titanium of 100 weight parts, the add-on of described steel scrap is the 3-10 weight part.
8, method according to claim 7, wherein, the content of carbon is 3.7-4.2 weight % in the described molten iron that contains the vanadium titanium, and corresponding to the described molten iron that contains the vanadium titanium of per 100 weight parts, when the add-on of described steel scrap was the 6.5-10 weight part, described auxiliary material also comprised temperature raising agent.
9, method according to claim 8, wherein, described temperature raising agent adds during for 0.5-2% at blowing oxygen quantity.
10, method according to claim 8, wherein, the consumption of described temperature raising agent is the 0.05-0.5 kilogram for heat 1 ℃ with respect to steel raw material per ton.
11, according to Claim 8 any described method-10, wherein, described temperature raising agent is class graphite and/or carburelant.
12, method according to claim 7, wherein, the content of carbon is more than the 4.2 weight % in the described molten iron that contains the vanadium titanium, and corresponding to the described molten iron that contains the vanadium titanium of per 100 weight parts, the add-on of described steel scrap is 3 weight parts to less than 6.5 weight parts the time, and described auxiliary material also comprises refrigerant.
13, method according to claim 12, wherein, described refrigerant adds during for 77-82% at blowing oxygen quantity.
14, method according to claim 12, wherein, wherein, the consumption of described refrigerant is to be the 0.05-0.5 kilogram for 1 ℃ with respect to steel raw material cooling per ton.
15, according to any described method among the claim 12-14, wherein, described refrigerant is a sludge ball.
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| CN102312036A (en) * | 2010-07-06 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Steelmaking and slagging method |
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| CN101407852A (en) * | 2008-11-11 | 2009-04-15 | 攀钢集团研究院有限公司 | Method for extracting vanadium slag from ultra-low vanadium-containing molten iron by using converter |
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