CN103122401A - Method for smelting low-phosphorus molten steel in converter - Google Patents
Method for smelting low-phosphorus molten steel in converter Download PDFInfo
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- CN103122401A CN103122401A CN2011103692373A CN201110369237A CN103122401A CN 103122401 A CN103122401 A CN 103122401A CN 2011103692373 A CN2011103692373 A CN 2011103692373A CN 201110369237 A CN201110369237 A CN 201110369237A CN 103122401 A CN103122401 A CN 103122401A
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Abstract
The invention discloses a method for smelting low-phosphorus molten steel in a converter. The method comprises the following steps of: adding semisteel, adding auxiliary materials in batches, and blowing, wherein the slag generated from the auxiliary materials added in the first batch mainly comprises 33-36% by weight of CaO, 7-9% by weight of MgO, 6-8% by weight of SiO2, 6-10% by weight of Al2O3, 14-16% by weight of FeO and 4-7% by weight of MnO, the slag generated from the auxiliary materials added in the second batch mainly comprises 36-38% by weight of CaO, 8-10% by weight of MgO, 7-9% by weight of SiO2, 3-5% by weight of Al2O3, 9-13% by weight of FeO and 4-6% by weight of MnO, and the slag generated from the auxiliary materials added in the third batch mainly comprises 37-40% by weight of CaO, 9-11% by weight of MgO, 10-11% by weight of SiO2, 1-2% by weight of Al2O3, 17-19% by weight of FeO and 4-6% by weight of MnO. The method disclosed by the invention can improve the phosphorus removal effect and reduce the consumption of auxiliary materials.
Description
Technical field
The present invention relates to a kind of method of converter smelting low-phosphorus molten steel.
Background technology
Along with the increase day by day of high-quality steel demand, higher to the requirement of phosphorus content in steel.At present, the method for converter smelting Low-phosphorus Steel mainly contains double slag process and duplex practice.Double slag process is to carry rifle midway in blowing to suspend blowing, after pouring out the part slag, then adds the slag charge method of slag making again.Duplex practice i.e. the first dephosphorization of a block converter, and then another block converter carbon drop heats up.The employing duplex practice is smelted, the organization of production difficulty, and production cost is higher.Take molten iron during as feed stock for blast furnace, and the initial stage that adopts double slag process to smelt exists basicity on the low side, and the problem of temperature drift, cause dephosphorization effect not good.Take half steel during as feed stock for blast furnace, and there is the shortage of heat slag in the initial stage that adopts double slag process to smelt, and causing slag is slow and affect dephosphorization effect and smelting cycle.
CN1995403A discloses the converter process that a kind of double slag process is produced high carbon low-phosphorus molten steel, this technique comprises that take high silicon high phosphorus hot metal is raw material, carry out a dephosphorization deslagging at Primary period, and control basicity of slag between 2.3-2.7, iron oxide content is the 12-16 % by weight; In blowing secondary dephosphorization deslagging in mid-term, and control basicity of slag between 3.2-3.7, iron oxide content is the 8-12 % by weight; At blowing later stage dephosphorization adjust molten bath terminal temperature and end point carbon again, basicity of slag is between 3.7-4.2 while finishing to control the later stage, and iron oxide content is the 10-15 % by weight.Described technique has solved the dephosphorization ability that the converter tapping steel with high carbon exists, the problem that terminal temperature is low.In addition, document (Sichuan metallurgical the 30th the 4th phase of volume) has carried out the process practice that the combined blown converter double slag process is produced Low-phosphorus Steel, points out dephosphorization and the importance of later stage rephosphorization in early stage.But the dephosphorization effect of aforesaid method is still not satisfactory.
Summary of the invention
The objective of the invention is to overcome the dephosphorization effect that adopts existing double slag process low phosphorus steel by smelting water not satisfactory and a kind of method with converter smelting low-phosphorus molten steel of higher dephosphorization effect is provided.
The present inventor finds, although in the disclosed method of CN1995403A, the method for three dephosphorizations of employing is controlled the phosphorus content in molten steel, and, its raw material is molten iron, smelts slag system and remains CaO-SiO
2-MgO-FeO slag system, Al in slag
2o
3content is very low.And adopt method of the present invention, by the oxygen blast process, add in three batches auxiliary material, and control the composition of auxiliary material and consumption and make the composition of the slag that obtains from high-aluminum low-silicon to the progressively transition of the high silicon of low aluminium, first utilize the slagging of high-aluminum low-silicon fast, basicity is high, and temperature compares CaO-SiO
2the advantage that-MgO-FeO slag system is low, the dephosphorization effect of raising Primary period, continue residue adjustment in mid-term, mainly prevent that the FeO minimizing from causing slag getting dry or splash, continuing residue adjustment in the later stage, is in order to reduce lining erosion and slag splashing, and further guarantees the effect of dephosphorization and inhibition rephosphorization.
To achieve these goals, the invention provides a kind of method of converter smelting low-phosphorus molten steel, the method comprises the steel raw material is added in converter, adds auxiliary material in batches, and carries out top bottom blowing, and described steel raw material is half steel, wherein,
The gross weight of the slag that the add-on of first auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 33-36 % by weight, and the content of MgO is the 7-9 % by weight, SiO
2content be the 6-8 % by weight, Al
2o
3content be the 6-10 % by weight, the content of FeO is the 14-16 % by weight, the content of MnO is the 4-7 % by weight; Carry out deslagging one time, and add the second batch auxiliary material;
The gross weight of the slag that the add-on of second batch auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 36-38 % by weight, and the content of MgO is the 8-10 % by weight, SiO
2content be the 7-9 % by weight, Al
2o
3content be the 3-5 % by weight, the content of FeO is the 9-13 % by weight, the content of MnO is the 4-6 % by weight; Carry out the secondary deslagging, and add the 3rd batch of auxiliary material;
The gross weight of the slag that the add-on of the 3rd batch of auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 37-40 % by weight, and the content of MgO is the 9-10 % by weight, SiO
2content be the 10-11 % by weight, Al
2o
3content be the 1-2 % by weight, the content of FeO is the 17-19 % by weight, the content of MnO is the 4-6 % by weight.
The present invention is by converting process, and portion-wise addition metallurgic auxiliary materials (comprising lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag) is smelted slag system to change, and has overcome CaO-SiO
2the deficiency of-MgO-FeO slag system semi-steel making, can significantly improve dephosphorization effect, and reduce the consumption of auxiliary material, increased benefit.
Other features and advantages of the present invention will partly be described in detail in embodiment subsequently.
Embodiment
Below will be elaborated to the specific embodiment of the present invention.Should be understood that, embodiment described herein only, for description and interpretation the present invention, is not limited to the present invention.
In this specification sheets term " top bottom blowing " used refer to by the oxygen rifle under the condition of top blast oxygen in converter, and made steel under the condition of bottom blowing shielding gas in converter.
In this specification sheets, term " oxygen supply intensity " used refers to the oxygen-supplying amount of the interior molten steel obtained in blowing per ton of unit time, and its unit is Nm
3/ min ton molten steel.
When in this specification sheets, term " terminal control " used refers to blow end point (oxygen blast end), make the chemical composition of molten steel and temperature reach that the tapping of plan steel grade requires and the control carried out simultaneously, comprise the carbon content of controlling tapping temperature and endpoint molten steel, phosphorus content, oxygen level etc.
In this specification sheets, term used " basicity " refers to weight concentration and the acidic oxide SiO of slag neutral and alkali oxide compound CaO
2the ratio of weight concentration.
Term " dephosphorization rate " the used ratio between phosphorus content in the difference of phosphorus content and the front molten iron of blowing or half steel that refers to blow in front half steel after phosphorus content and blowing in endpoint molten steel in this specification sheets.
Term " half steel " used in this specification sheets can refer to the blast-melted product obtained after the desulfurization vanadium extraction.Described half steel can be benchmark for take the total amount of half steel, the half steel of the vanadium of the sulphur of the manganese of the carbon that contains the 3.5-3.8 % by weight, 0.015-0.05 % by weight, the phosphorus of 0.06-0.09 % by weight, 0.002-0.03 % by weight, the titanium of 0.01-0.06 % by weight, 0.02-0.04 % by weight and the iron of surplus.The total amount of half steel of take is benchmark, average carbon content 3.6 % by weight of described half steel, and average vanadium content 0.03 % by weight, silicone content is trace.Under preferable case, the total amount of half steel of take is benchmark, the vanadium of the carbon that described half steel contains the 3.5-3.8 % by weight, 0.01-0.04 % by weight and the iron of surplus.
In this specification sheets, term " rifle position " used refers to before the lower-most point of shower nozzle of oxygen rifle and oxygen blast the distance of liquid steel level in converter.
According to the present invention, the method for described converter smelting low-phosphorus molten steel comprises the steel raw material is added in converter, adds auxiliary material in batches, and carries out top bottom blowing, and described steel raw material is half steel, wherein,
The gross weight of the slag that the add-on of first auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 33-36 % by weight, is preferably the 35-36 % by weight; The content of MgO is the 7-9 % by weight, is preferably the 7-8 % by weight; SiO
2content be the 6-8 % by weight, be preferably the 6-7 % by weight; Al
2o
3content be the 6-10 % by weight, be preferably the 7-9 % by weight; The content of FeO is the 14-16 % by weight, is preferably the 15-16 % by weight; The content of MnO is the 4-7 % by weight, is preferably the 5-7 % by weight; Carry out deslagging one time, and add the second batch auxiliary material;
The gross weight of the slag that the add-on of second batch auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 36-38 % by weight, is preferably the 37-38 % by weight; The content of MgO is the 8-10 % by weight, is preferably the 9-10 % by weight; SiO
2content be the 7-9 % by weight, be preferably the 8-9 % by weight; Al
2o
3content be the 3-5 % by weight, be preferably the 3-5 % by weight; The content of FeO is the 9-13 % by weight, is preferably the 10-12 % by weight; The content of MnO is the 4-6 % by weight, is preferably the 4-5 % by weight; Carry out the secondary deslagging, and add the 3rd batch of auxiliary material;
The gross weight of the slag that the add-on of the 3rd batch of auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 37-40 % by weight, is preferably the 38-40 % by weight; The content of MgO is the 9-10 % by weight, is preferably the 10-11 % by weight; SiO
2content be the 10-11 % by weight, be preferably the 10-11 % by weight; Al
2o
3content be the 1-2 % by weight, be preferably the 1-2 % by weight; The content of FeO is the 17-19 % by weight, is preferably the 18-19 % by weight; The content of MnO is the 4-6 % by weight, is preferably the 5-6 % by weight.
The present inventor finds, adopts in the double slag process smelting molten steel process of prior art, take half steel during as feed stock for blast furnace, and the double-slag operation initial stage exists shortage of heat to change the problem of slag, so dephosphorization effect is not good and smelting cycle is long.And in the present invention, adopt and add metallurgic auxiliary materials three times, and control the composition of slag by composition, consumption and the oxygen blast condition of controlling every batch of metallurgic auxiliary materials, can make and take half steel during as feed stock for blast furnace, initial smelting period realizationizations slag soon, the low temperature dephosphorization effect better, stronger.
According to the present invention, described auxiliary material comprises lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag, in described metallurgic auxiliary materials, lime, high magnesium lime, the consumption of composite fluxing medium and vanadium iron metallurgical slag can be adjusted in wider scope, as long as can meet the add-on of auxiliary material and oxygen blast condition, make the composition that adds each stage slag after auxiliary material in scope of the present invention, under preferable case, with respect to molten steel per ton, total consumption of described lime is the 15-20 kilogram, total consumption of described high magnesium lime is the 9-11 kilogram, total consumption of described composite fluxing medium is the 4-6 kilogram, total consumption of described ladle slag is the 4-6 kilogram, total consumption of described vanadium iron metallurgical slag is the 9-12 kilogram, described composite fluxing medium is for take its gross weight as benchmark, SiO
2content be the 47-50 % by weight, the composite fluxing medium that the content of FeO is the 8-10 % by weight, described ladle slag is for take its gross weight as benchmark, and the content of CaO is the 40-55 % by weight, SiO
2the content content that is 18-21 % by weight, FeO the ladle slag that is the 1-3 % by weight, described vanadium iron metallurgical slag is for take its gross weight as benchmark, Al
2o
3content be the 56-64 % by weight, the vanadium iron metallurgical slag that the content of MgO is the 14-18 % by weight.
Wherein, described lime mainly contains CaO, and to take the gross weight of described lime be benchmark, and the content of CaO is the 85-90 % by weight.Described high magnesium lime mainly contains MgO and CaO, and the gross weight of described high magnesium lime of take is benchmark, and the content of MgO is the 30-40 % by weight, and the content of CaO is the 48-57 % by weight.
According to the present invention, add auxiliary material in batches, and to adopt top bottom blowing be conventionally known to one of skill in the art by the oxygen rifle to the method for top blast oxygen in converter, for example, can first add first auxiliary material top blast oxygen, after the composition of the slag that smelting obtains reaches requirement of the present invention, carry out deslagging one time; Then add the second batch auxiliary material and continue top blast oxygen, after the composition of the slag that smelting obtains reaches requirement of the present invention, carry out the secondary deslagging; Then add the 3rd batch of auxiliary material and continue top blast oxygen, until the slag obtained reaches requirement of the present invention.
According to the present invention, the add-on of described first auxiliary material is preferably the vanadium iron metallurgical slag of the 74-78 % by weight of the ladle slag of 70-75 % by weight of composite slag, ladle slag total amount of 50-55 % by weight of high magnesium lime, composite fluxing medium total amount of 50-55 % by weight of lime, high magnesium lime total amount of the 50-55 % by weight that comprises the lime total amount and vanadium iron metallurgical slag total amount.Control CaO, MgO, SiO in slag at Primary period
2, Al
2o
3, FeO and MnO content in scope of the present invention, can take full advantage of the early stageization slag good, bath temperature low (bath temperature maintains 1350-1410 ℃ substantially), the dephosphorization thermodynamic condition that basicity is high, adopt top and bottom complex blowing to add strong mixing and improve the dephosphorization dynamic conditions, can obtain good dephosphorization effect.
Wherein, described oxygen blast condition optimization comprises that oxygen supply intensity is 2.7-3.3Nm
3/ min ton molten steel, oxygen blow duration is 4-6 minute.Further, under preferable case, described oxygen blown method is: first with 3.1-3.3Nm
3the oxygen supply intensity oxygen blast 2-3 minute of/min ton molten steel, oxygen rifle location optimization is 1.4-1.6 rice, then with 2.7-2.8Nm
3the oxygen supply intensity oxygen blast 2-3 minute of/min ton molten steel, oxygen rifle location optimization is 1.7-1.9 rice.In employing-Gao rifle position and applicable oxygen supply intensity are blown more is conducive to control the composition of slag.
Under preferable case, in described first auxiliary material, the weight ratio of lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag is 1: (0.5-0.6): (0.25-0.35): (0.3-0.35): (0.75-0.85).
According to the present invention, the method of described deslagging can be carried out according to the method for those skilled in the art's routine, and bed drain purge also can be determined according to the situation of realization, under preferable case, after finishing blowing, carry out deslagging one time, a bed drain purge is the 70-85 % by weight that adds the total amount of the slag (rich phosphorus slag) generated after first auxiliary material oxygen blast.
According to the present invention, the add-on of described second batch auxiliary material is preferably the vanadium iron metallurgical slag of the 22-26 % by weight of the ladle slag of 25-30 % by weight of composite fluxing medium, ladle slag total amount of 30-35 % by weight of high magnesium lime, composite fluxing medium total amount of 30-35 % by weight of lime, high magnesium lime total amount of the 30-35 % by weight that comprises the lime total amount and vanadium iron metallurgical slag total amount.CaO, MgO, SiO in mid-term is controlled slag in blowing
2, Al
2o
3, FeO and MnO content in scope of the present invention, and increase the content of silicon in slag, the content that simultaneously reduces aluminium in slag can further prevent the minimizing of FeO and the slag getting dry or the splash that cause.Owing to blowing mid-term, due to the decarburizing reaction aggravation, in bath temperature rising and slag, FeO content reduces, dephosphorization thermodynamic condition variation, easily rephosphorization.Therefore, the operation of the deslagging after must finishing by Primary period reduces P in slag
2o
5content, simultaneously meet enough basicity and FeO content in blowing mid-term slag making again, realizes the inhibition rephosphorization in dephosphorization and blowing later stage.
Wherein, described oxygen blast condition optimization comprises that oxygen supply intensity is 2.7-2.8Nm
3/ min ton molten steel, oxygen blow duration is 6-8 minute.Under preferable case, oxygen rifle position is 1.7-1.9 rice.Adopt high rifle position and applicable oxygen supply intensity to be blown and more be conducive to control the composition of slag.
Under preferable case, in described second batch auxiliary material, the weight ratio of lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag is 1: (0.5-0.65): (0.25-0.35): (0.15-0.25): (0.3-0.45).
According to the present invention, the method of described deslagging can be carried out according to the method for those skilled in the art's routine, and bed drain purge also can be determined according to the situation of realization, under preferable case, after finishing blowing, carry out the secondary deslagging, the secondary bed drain purge is the 30-40 % by weight that adds the total amount of the slag (rich phosphorus slag) generated after second batch auxiliary material oxygen blast.
According to the present invention, the add-on of described the 3rd batch of auxiliary material is preferably the composite fluxing medium of 10-20 % by weight of high magnesium lime, composite fluxing medium total amount of 10-20 % by weight of lime, the high magnesium lime total amount of the 10-20 % by weight that comprises the lime total amount.CaO, MgO, SiO in controlling slag in the blowing later stage
2, Al
2o
3, FeO and MnO content in scope of the present invention, and further increase the content of silicon in slag, the content that reduces the content of aluminium in slag simultaneously and increase FeO contributes to further dephosphorization and suppresses rephosphorization, more favourable to slag splashing technique.
Wherein, described oxygen blast condition optimization comprises that oxygen supply intensity is 2.7-2.8Nm
3/ min ton molten steel, oxygen blow duration is 2-3 minute.Further, under preferable case, described oxygen blown method is: first with 2.7-2.8Nm
3the oxygen supply intensity oxygen blast 1-1.5 minute of/min ton molten steel, oxygen rifle location optimization is 1.4-1.6 rice, and 40-60 second before tapping, oxygen rifle location optimization is lower than 1 meter, and oxygen blow duration is 1-1.5 minute.Adopt high-low rifle position and applicable oxygen supply intensity to be blown and more be conducive to control the composition of slag.
Under preferable case, in described the 3rd batch of auxiliary material, the weight ratio of lime, high magnesium lime and composite fluxing medium is 1: (0.35-0.8): (0.2-0.4).
In the present invention, the plurality of raw materials in every a collection of auxiliary material can add respectively also can evenly mix and add afterwards, can continous way add also and can add by intermittent type.
In the present invention, the commonly used method of bessemerizing that described converter top bottom blowing method is known to the skilled person.Preferably, described converter top bottom blowing is top blast oxygen, bottom blowing shielding gas, and according to the present invention, the intensity of bottom blowing shielding gas can be 0.015-0.045Nm
3/ ton molten steel min.For example, can for example,, at Primary period bottom blowing inactive gas (nitrogen), in the blowing later stage, switch to bottom blowing rare gas element (for example argon gas).Described shielding gas is rare gas element and/or nitrogen.
Under preferable case, after adding the 3rd batch of auxiliary material and smelting end, molten steel is tapped in ladle, and carry out the deoxidation step that well known to a person skilled in the art such as pre-alloyed in tapping process, and slag is stayed in converter, carry out slag splashing, that is, can adopt the rifle position to carry out nitrogen blowing lower than 1 meter.
According to the present invention, in the process of bessemerizing, make slag (high silicon, low aluminium) transition from high-aluminum low-silicon to existing converter slag by add metallurgic auxiliary materials and control the oxygen blast condition in batches, be mainly to utilize the slagging of high-aluminum low-silicon fast, basicity is high, and temperature compares CaO-SiO
2the advantage that-MgO-FeO slag system is low, the dephosphorization effect of raising Primary period.The residue adjustment in mid-term is mainly to prevent that the FeO minimizing from causing slag getting dry or splash, later stage-residue adjustment is mainly to reduce lining erosion and slag splashing, and reaches further dephosphorization and suppress rephosphorization.
The present invention completes whole converting process on a block converter, make the high-aluminum low-silicon slag by adding first metallurgic auxiliary materials early stage, greatly brought into play the characteristic of this class slag, improve the dephosphorization effect in early stage, then deslagging can be removed rich phosphorus slag, and second batch is added in continuation and the 3rd batch of metallurgic auxiliary materials made the further dephosphorization of new slag and suppressed rephosphorization, can make the phosphorus content in molten steel be controlled in 0.015 % by weight, can also reduce the blowing cycle simultaneously, and reduction quickened lime, the consumption of high magnesium lime, realize ladle slag simultaneously, the recycle of vanadium iron metallurgical slag, alleviated environmental stress, reach the purpose of cost efficiency.
According to method provided by the invention, described oxygen blown process and add the process of auxiliary material to realize automatic control by computer.
More than describe the preferred embodiment of the present invention in detail; but the present invention is not limited to the detail in above-mentioned embodiment, in technical conceive scope of the present invention; can carry out multiple simple variant to technical scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, for fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, between various embodiment of the present invention, also can carry out arbitrary combination, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Below will describe the present invention by embodiment.
In following examples, described auxiliary material contains lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag; In lime, the content of CaO is 90 % by weight; In high magnesium lime, the content of MgO is 40 % by weight, and the content of CaO is 57 % by weight; SiO in composite fluxing medium
2content be 48 % by weight, FeO content is 8 % by weight; In ladle slag, the content of CaO is 50 % by weight, SiO
2content be 20 % by weight, FeO content is 2 % by weight; Al in the vanadium iron metallurgical slag
2o
3content be 60 % by weight, the content of MgO is 16 % by weight.
In following examples, the measuring method that described slag forms is the xrf analysis method, the content of Ca, Mg, Si, Al, Fe, Mn, P, S, V, Ti in the Main Analysis slag.
Embodiment 1
The present embodiment is for illustrating the method for converter smelting low-phosphorus molten steel provided by the invention.
Half steel after 120 tons of vanadium extractions is added in converter and smelted, wherein the composition of half steel and charging temperature are as shown in table 1 below, then add auxiliary material and be blown into wherein oxygen in converter, the gross weight of the auxiliary material added (lime, high magnesium lime, composite slag and containing the aluminium slag charge) is as shown in table 2, the relation that adds corresponding blowing oxygen quantity when adding auxiliary material of auxiliary material as:
Add first auxiliary material top blast oxygen, described first auxiliary material comprises the vanadium iron metallurgical slag of 78 % by weight of the ladle slag of 75 % by weight of composite fluxing medium, ladle slag total amount of 54 % by weight of high magnesium lime, composite fluxing medium total amount of 53 % by weight of lime, high magnesium lime total amount of 55 % by weight of lime total amount and vanadium iron metallurgical slag total amount, the oxygen blast condition comprises that starting the rifle position is 1.4 meters, and first with 3.1Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 3 minutes, then carry the rifle position to 1.7 meters, then with 2.7Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 3 minutes; And bottom blowing nitrogen always, the nitrogen air supply intensity is 2.5Nm
3/ min ton molten steel; Pour out the rich phosphorus slag of slag gross weight 80 % by weight after the molten steel Primary period finishes, bath temperature is controlled at 1350-1410 ℃, and the gross weight of slag of take is benchmark, described slag consist of CaO:36 % by weight, MgO:8 % by weight, SiO
2: 7 % by weight, Al
2o
3: 8 % by weight, FeO:16 % by weight, MnO:7 % by weight;
Add second batch auxiliary material top blast oxygen, described second batch auxiliary material comprises the vanadium iron metallurgical slag of 22 % by weight of the ladle slag of composite fluxing medium, ladle slag total amount 25 % by weight of 33 % by weight of high magnesium lime, composite fluxing medium total amount of 33 % by weight of lime, high magnesium lime total amount of 35 % by weight of lime total amount and vanadium iron metallurgical slag total amount, and the oxygen blast condition comprises that oxygen supply intensity is 2.7Nm
3/ min ton molten steel, oxygen blow duration is 7 minutes, the rifle position is 1.7 meters; And bottom blowing nitrogen always, the nitrogen air supply intensity is 3Nm
3/ min ton molten steel; Pour out the rich phosphorus slag of slag gross weight 30 % by weight after blowing finishes mid-term, the gross weight of slag of take is benchmark, described slag consist of CaO:38 % by weight, MgO:10 % by weight, SiO
2: 8 % by weight, Al
2o
3: 3 % by weight, FeO:11 % by weight, MnO:6 % by weight;
Add the 3rd batch of auxiliary material top blast oxygen, described the 3rd batch of auxiliary material comprises the composite fluxing medium of 13 % by weight of high magnesium lime, composite fluxing medium total amount of 14 % by weight of lime, the high magnesium lime total amount of 10 % by weight of lime total amount, the oxygen blast condition comprises that starting the rifle position is 1.7 meters, and with 2.7Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 2 minutes, and bottom blowing nitrogen always, the nitrogen air supply intensity is 2.8Nm
3/ min ton molten steel; After the blowing later stage finishes, the gross weight of slag of take is benchmark, described slag consist of CaO:40 % by weight, MgO:10 % by weight, SiO
2: 11 % by weight, Al
2o
3: 2 % by weight, FeO:19 % by weight, MnO:7 % by weight;
To obtain molten steel and be tapped, and to having gone out the slag stayed after steel, adopting the rifle position to be less than 1 meter nitrogen blowing, the air supply intensity of nitrogen is 2.7Nm
3/ min ton molten steel, carry out slag splashing, and the time is controlled at 30 seconds, guarantees the slag splashing effect.
Composition and the tapping temperature of tapping molten steel are as shown in table 3, and the weight of tapping is 130 tons, the steel that the steel of refining is the U75V steel grade.
Table 1
| C | Si | Mn | P | S | V | Ti | Fe | Charging temperature (℃) | |
| Half composition of steel (% by weight) | 3.6 | Trace | 0.02 | 0.08 | 0.02 | 0.03 | 0.01 | Surplus | 1320 |
Table 2
| Auxiliary material | Lime (kg) | High magnesium lime (kg) | Ladle slag (kg) | Composite fluxing medium (kg) | Vanadium titanium metallurgical slag (kg) |
| Add total amount | 2360 | 1320 | 560 | 660 | 1300 |
Table 3
In this convertor steelmaking process, the phenomenon of spitting and getting dry does not appear, and in molten steel, phosphorus content is lower than 0.015 % by weight, and dephosphorization rate is more than 90%; And, start 3 minutes to form from oxygen blast the slag that covers molten steel, shorten 0.5 minute than conventional method for making steel.
Embodiment 2
The present embodiment is for illustrating the method for converter smelting low-phosphorus molten steel provided by the invention.
Half steel after 120 tons of vanadium extractions is added in converter and smelted, wherein the composition of half steel and charging temperature are as shown in table 4 below, then add auxiliary material and be blown into wherein oxygen in converter, the gross weight of the auxiliary material added (lime, high magnesium lime, composite slag and containing the aluminium slag charge) is as shown in table 5, the relation that adds corresponding blowing oxygen quantity when adding auxiliary material of auxiliary material as:
Add first auxiliary material top blast oxygen, described first auxiliary material comprises the composite slag of 53 % by weight of the high magnesium lime of 52 % by weight of lime, high magnesium lime total amount of 51 % by weight of lime total amount and composite slag total amount, the vanadium iron metallurgical slag of 74 % by weight of the ladle slag of 70 % by weight of ladle slag total amount and vanadium iron metallurgical slag total amount, the oxygen blast condition comprises that starting the rifle position is 1.6 meters, and first with 3.3Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 3.5 minutes, then carry the rifle position to 1.9 meters, then with 2.8Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 2.5 minutes; And bottom blowing nitrogen always, the nitrogen air supply intensity is 2.5Nm
3/ min ton molten steel; Pour out the rich phosphorus slag of slag gross weight 75% after the molten steel Primary period finishes, bath temperature is controlled at 1350-1410 ℃, and the gross weight of slag of take is benchmark, described slag consist of CaO:33 % by weight, MgO:7 % by weight, SiO
2: 6 % by weight, Al
2o
3: 9 % by weight, FeO:15 % by weight, MnO:6 % by weight;
Add second batch auxiliary material top blast oxygen, described second batch auxiliary material comprises the high magnesium lime of 32 % by weight of lime, the high magnesium lime total amount of 33 % by weight of lime total amount, the vanadium iron metallurgical slag of 26 % by weight of the ladle slag of the composite fluxing medium of 31 % by weight of composite fluxing medium total amount, ladle slag total amount 30 % by weight and vanadium iron metallurgical slag total amount, the oxygen blast condition comprises that oxygen supply intensity is 2.8Nm
3/ min ton molten steel, oxygen blow duration is 6 minutes, the rifle position is 1.9 meters; And bottom blowing nitrogen always, the nitrogen air supply intensity is 3Nm
3/ min ton molten steel; Pour out the rich phosphorus slag of slag gross weight 35% after blowing finishes mid-term, the gross weight of slag of take is benchmark, described slag consist of CaO:35 % by weight, MgO:10 % by weight, SiO
2: 7 % by weight, Al
2o
3: 3 % by weight, FeO:10 % by weight, MnO:6 % by weight;
Add the 3rd batch of auxiliary material top blast oxygen, described the 3rd batch of auxiliary material comprises the composite slag of 16 % by weight of the high magnesium lime of 16 % by weight of lime, high magnesium lime total amount of 16 % by weight of lime total amount and composite slag total amount, the oxygen blast condition comprises that starting the rifle position is 1.9 meters, and first with 2.8Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 2 minutes, and bottom blowing nitrogen always, the nitrogen air supply intensity is 2.8Nm
3/ min ton molten steel; After the molten steel blowing later stage finishes, the gross weight of slag of take is benchmark, described slag consist of CaO:37 % by weight, MgO:9 % by weight, SiO
2: 10 % by weight, Al
2o
3: 2 % by weight, FeO:17 % by weight, MnO:6 % by weight;
To obtain molten steel and be tapped, and to having gone out the slag stayed after steel, adopting the rifle position to be less than 1 meter nitrogen blowing, the air supply intensity of nitrogen is 2.8Nm
3/ min ton molten steel, carry out slag splashing, and the time is controlled at 30 seconds, guarantees the slag splashing effect.
Composition and the tapping temperature of tapping molten steel are as shown in table 6, and the weight of tapping is 130 tons, the steel that the steel of refining is the U75V steel grade.
Table 4
| C | Si | Mn | P | S | V | Ti | Fe | Charging temperature (℃) | |
| Half composition of steel (% by weight) | 3.6 | Trace | 0.02 | 0.08 | 0.02 | 0.03 | 0.01 | Surplus | 1320 |
Table 5
| Auxiliary material | Lime (kg) | High magnesium lime (kg) | Ladle slag (kg) | Composite fluxing medium (kg) | Vanadium titanium metallurgical slag (kg) |
| Add total amount | 2200 | 1180 | 550 | 640 | 1260 |
Table 6
In this convertor steelmaking process, the phenomenon of spitting and getting dry does not appear, and in molten steel, P content is lower than 0.015 % by weight, and dephosphorization rate is 90%; And, from adding converter, described half steel forms the slag that covers molten steel after 3 minutes, shorten 0.5 minute than conventional method for making steel.
Embodiment 3
The present embodiment is for illustrating the method for converter smelting low-phosphorus molten steel provided by the invention.
Half steel after 120 tons of vanadium extractions is added in converter and smelted, wherein the composition of half steel and charging temperature are as shown in table 7 below, then add auxiliary material and be blown into wherein oxygen in converter, the gross weight of the auxiliary material added (lime, high magnesium lime, composite slag and containing the aluminium slag charge) is as shown in table 8, the relation that adds corresponding blowing oxygen quantity when adding auxiliary material of auxiliary material as:
Add first auxiliary material top blast oxygen, described first auxiliary material comprises the composite slag of 51 % by weight of the high magnesium lime of 55 % by weight of lime, high magnesium lime total amount of 53 % by weight of lime total amount and composite slag total amount, the vanadium iron metallurgical slag of 76 % by weight of the ladle slag of 73 % by weight of ladle slag total amount and vanadium iron metallurgical slag total amount, the oxygen blast condition comprises that starting the rifle position is 1.5 meters, and first with 3.2Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 3 minutes, then carry the rifle position to 1.8 meters, then with 2.8Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 3 minutes; And bottom blowing nitrogen always, the nitrogen air supply intensity is 3Nm
3/ min ton molten steel; Pour out the rich phosphorus slag of slag gross weight 80% after the molten steel Primary period finishes, bath temperature is controlled at 1350-1410 ℃, and the gross weight of slag of take is benchmark, described slag consist of CaO:35 % by weight, MgO:8 % by weight, SiO
2: 7 % by weight, Al
2o
3: 7 % by weight, FeO:15 % by weight, MnO:7 % by weight;
Add second batch auxiliary material top blast oxygen, described second batch auxiliary material comprises the composite slag of 35 % by weight of the high magnesium lime of 34 % by weight of lime, high magnesium lime total amount of 31 % by weight of lime total amount and composite slag total amount, the ladle slag total amount, the vanadium iron metallurgical slag of 24 % by weight of the ladle slag of 27 % by weight and vanadium iron metallurgical slag total amount, the oxygen blast condition comprises that oxygen supply intensity is 2.8Nm
3/ min ton molten steel, oxygen blow duration is 8 minutes, the rifle position is 1.8 meters; And bottom blowing nitrogen always, the nitrogen air supply intensity is 3Nm
3/ min ton molten steel; Pour out the rich phosphorus slag of slag gross weight 30% after blowing finishes mid-term, the gross weight of slag of take is benchmark, described slag consist of CaO:36 % by weight, MgO:8 % by weight, SiO
2: 8 % by weight, Al
2o
3: 3 % by weight, FeO:11 % by weight, MnO:6 % by weight;
Add the 3rd batch of auxiliary material top blast oxygen, described the 3rd batch of auxiliary material comprises the composite slag of 14 % by weight of the high magnesium lime of 11 % by weight of lime, high magnesium lime total amount of 16 % by weight of lime total amount and composite slag total amount, the oxygen blast condition comprises that starting the rifle position is 1.8 meters, and first with 2.7Nm
3the oxygen supply intensity oxygen blast of/min ton molten steel 2 minutes, and bottom blowing nitrogen always, the nitrogen air supply intensity is 2.9Nm
3/ min ton molten steel; After the molten steel blowing later stage finishes, the gross weight of slag of take is benchmark, described slag consist of CaO:38 % by weight, MgO:10 % by weight, SiO
2: 10 % by weight, Al
2o
3: 2 % by weight, FeO:19 % by weight, MnO:5 % by weight;
To obtain molten steel and be tapped, and to having gone out the slag stayed after steel, adopting the rifle position to be less than 1 meter nitrogen blowing, the air supply intensity of nitrogen is 2.8Nm
3/ min ton molten steel, carry out slag splashing, and the time is controlled at 30 seconds, guarantees the slag splashing effect.
Composition and the tapping temperature of tapping molten steel are as shown in table 9, and the weight of tapping is 130 tons, the steel that the steel of refining is the U75V steel grade.
Table 7
| C | Si | Mn | P | S | V | Ti | Fe | Charging temperature (℃) | |
| Half composition of steel (% by weight) | 3.6 | Trace | 0.02 | 0.08 | 0.02 | 0.03 | 0.01 | Surplus | 1320 |
Table 8
| Auxiliary material | Lime (kg) | High magnesium lime (kg) | Ladle slag (kg) | Composite fluxing medium (kg) | Vanadium titanium metallurgical slag (kg) |
| Add total amount | 2290 | 1260 | 555 | 655 | 1290 |
Table 9
In this convertor steelmaking process, the phenomenon of spitting and getting dry does not appear, and in molten steel, P content is lower than 0.015 % by weight, and dephosphorization rate is 90%; And, from adding converter, described half steel forms the slag that covers molten steel after 3 minutes, shorten 0.5 minute than conventional method for making steel.
Claims (12)
1. the method for a converter smelting low-phosphorus molten steel, the method comprises the steel raw material is added in converter, adds auxiliary material in batches, and carries out top bottom blowing, described steel raw material is half steel, it is characterized in that,
The gross weight of the slag that the add-on of first auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 33-36 % by weight, and the content of MgO is the 7-9 % by weight, SiO
2content be the 6-8 % by weight, Al
2o
3content be the 6-10 % by weight, the content of FeO is the 14-16 % by weight, the content of MnO is the 4-7 % by weight; Carry out deslagging one time, and add the second batch auxiliary material;
The gross weight of the slag that the add-on of second batch auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 36-38 % by weight, and the content of MgO is the 8-10 % by weight, SiO
2content be the 7-9 % by weight, Al
2o
3content be the 3-5 % by weight, the content of FeO is the 9-13 % by weight, the content of MnO is the 4-6 % by weight; Carry out the secondary deslagging, and add the 3rd batch of auxiliary material;
The gross weight of the slag that the add-on of the 3rd batch of auxiliary material and oxygen blast condition make to generate is benchmark, and the content that the chief component of slag is CaO is the 37-40 % by weight, and the content of MgO is the 9-10 % by weight, SiO
2content be the 10-11 % by weight, Al
2o
3content be the 1-2 % by weight, the content of FeO is the 17-19 % by weight, the content of MnO is the 4-6 % by weight.
2. method according to claim 1, wherein, described auxiliary material comprises lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag, with respect to molten steel per ton, total consumption of described lime is the 15-20 kilogram, and total consumption of described high magnesium lime is the 9-11 kilogram, and total consumption of described composite fluxing medium is the 4-6 kilogram, total consumption of described ladle slag is the 4-6 kilogram, and total consumption of described vanadium iron metallurgical slag is the 9-12 kilogram; Described composite fluxing medium is for take its gross weight as benchmark, SiO
2content be the 47-50 % by weight, the composite fluxing medium that the content of FeO is the 8-10 % by weight; Described ladle slag is for take its gross weight as benchmark, and the content of CaO is the 40-55 % by weight, SiO
2content be the 18-21 % by weight, the ladle slag that the content of FeO is the 1-3 % by weight; Described vanadium iron metallurgical slag is for take its gross weight as benchmark, Al
2o
3content be the 56-64 % by weight, the vanadium iron metallurgical slag that the content of MgO is the 14-18 % by weight.
3. method according to claim 2, wherein, add first auxiliary material top blast oxygen, described first auxiliary material comprises the vanadium iron metallurgical slag of the 74-78 % by weight of the ladle slag of 70-75 % by weight of composite slag, ladle slag total amount of 50-55 % by weight of high magnesium lime, composite fluxing medium total amount of 50-55 % by weight of lime, high magnesium lime total amount of the 50-55 % by weight of lime total amount and vanadium iron metallurgical slag total amount; Described oxygen blast condition comprises that oxygen supply intensity is 2.7-3.3Nm
3/ min ton molten steel, oxygen blow duration is 4-6 minute.
4. method according to claim 3, wherein, in described first auxiliary material, the weight ratio of lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag is 1: (0.5-0.6): (0.25-0.35): (0.3-0.35): (0.75-0.85).
5. according to the method in claim 2 or 3, wherein, a bed drain purge is the 70-85 % by weight that adds the slag total amount generated after first auxiliary material oxygen blast.
6. method according to claim 2, wherein, add the second batch auxiliary material and be blown into oxygen, described second batch auxiliary material comprises the vanadium iron metallurgical slag of the 22-26 % by weight of the ladle slag of 25-30 % by weight of composite fluxing medium, ladle slag total amount of 30-35 % by weight of high magnesium lime, composite fluxing medium total amount of 30-35 % by weight of lime, high magnesium lime total amount of the 30-35 % by weight of lime total amount and vanadium iron metallurgical slag total amount; The oxygen blast condition comprises that oxygen supply intensity is 2.7-2.8Nm
3/ min ton molten steel, oxygen blow duration is 6-8 minute.
7. method according to claim 6, wherein, in described second batch auxiliary material, the weight ratio of lime, high magnesium lime, composite fluxing medium, ladle slag and vanadium iron metallurgical slag is 1: (0.5-0.65): (0.25-0.35): (0.15-0.25): (0.3-0.45).
8. according to the described method of claim 2 or 6, wherein, the secondary bed drain purge is the 30-40 % by weight that adds the total amount of the slag generated after second batch auxiliary material oxygen blast.
9. method according to claim 2, wherein, add the 3rd batch of auxiliary material and be blown into oxygen, described the 3rd batch of auxiliary material comprises the composite fluxing medium of 10-20 % by weight of high magnesium lime, composite fluxing medium total amount of 10-20 % by weight of lime, the high magnesium lime total amount of the 10-20 % by weight of lime total amount, and the oxygen blast condition comprises that oxygen supply intensity is 2.7-2.8Nm
3/ min ton molten steel, oxygen blow duration is 2-3 minute.
10. method according to claim 9, wherein, in described the 3rd batch of auxiliary material, the weight ratio of lime, high magnesium lime and composite fluxing medium is 1: (0.35-0.8): (0.2-0.4).
11. method according to claim 1, wherein, it is the 0.08-0.14 % by weight that the condition that blow end point is controlled makes carbon content of molten steel, and the converter terminal temperature is 1670 ℃-1685 ℃.
12. method according to claim 1, wherein, the gross weight of described half steel of take is benchmark, the sulphur of the manganese of the carbon that described half steel contains the 3.5-3.8 % by weight, 0.015-0.05 % by weight, the phosphorus of 0.06-0.09 % by weight, 0.002-0.03 % by weight, the titanium of 0.01-0.06 % by weight, the vanadium of 0.02-0.04 % by weight and the iron of surplus.
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| CN111850241A (en) * | 2020-07-23 | 2020-10-30 | 芜湖县天海耐火炉料有限公司 | Sintered synthetic slag and preparation method thereof |
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| CN110935851A (en) * | 2020-02-18 | 2020-03-31 | 金华市婺银网络科技有限公司 | Equipment capable of preventing molten steel from rephosphorization in steel ladle |
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| CN111850241A (en) * | 2020-07-23 | 2020-10-30 | 芜湖县天海耐火炉料有限公司 | Sintered synthetic slag and preparation method thereof |
| CN111850241B (en) * | 2020-07-23 | 2021-10-19 | 芜湖县天海耐火炉料有限公司 | Sintered synthetic slag and preparation method thereof |
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