CN102304606B - Slag former and slagging method for semisteel steelmaking - Google Patents
Slag former and slagging method for semisteel steelmaking Download PDFInfo
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Abstract
The invention provides a slag former and a slagging method for semisteel steelmaking. The slag former comprises 60 to 75 percent of SiO2, 10 to 15 percent of CaO, 1 to 3 percent of MgO, 7 to 15 percent of FeO, 1 to 3 percent of Fe2O3 and a small quantity of inevitable impurities. The slagging method comprises the following steps of: slagging by using the slag former for the semisteel steelmaking, active lime and high-magnesium lime, and controlling the addition opportunity and addition quantity of slagging materials appropriately. By the slag former and the slagging method for the semisteel steelmaking, the problems of low slagging speed and dephosphorization rate during semisteel smelting can be solved, initial slag formation time and pure oxygen blast time can be shortened effectively, and the molten steel dephosphorization rate of a finishing point of a converter can be improved.
Description
Technical field
The present invention relates to steelmaking technical field, more particularly, relate to a kind of semi-steel making with the slagging method of slag former and semi-steel making.
Background technology
When smelting to produce steel with the v-ti magnetite ore resources, the main raw material of converter steelmaking is through the half steel after special-purpose vanadium extraction by converter blowing.Usually, the molten steel that vanadium-bearing hot metal is obtained after the desulfurization vanadium extraction is called half steel.In the half steel that vanadium-bearing hot metal obtains after the desulfurization vanadium extraction, carbonaceous amount percentage composition is 3.4%～4.0%, the heating such as silicon, manganese slagging constituent content is vestige, and element sulphur quality percentage composition is controlled in 0.015%, and phosphoric quality percentage composition is 0.060%～0.080%.Therefore, semi-steel making has that in converting process, acid slagging material is few, the slag system constituent element is single and the characteristics such as shortage of heat, causes forming under the semi-steel making condition initial stage slag required time long, and dephosphorization rate is low.The problem of shortage of heat can be solved by the method that adds temperature raising agent, but the problem that slagging speed is slow, dephosphorization rate low and tap to tap time is partially long is the existing outstanding problem of semi-steel making always.
In existing technology, although disclose multiple converter steelmaking with slag former and manufacture method thereof, basically all fail to solve the problems of the technologies described above.
In on January 19th, 2000 disclosed No. 1241637 Chinese patent application a kind of composite fluxing medium is disclosed, this composite fluxing medium mainly contains (weight percent) steel-smelting sewage sludge 10%～70%, light-burning magnesium powder 30%～90%.In addition, it also can contain silicon powder 1%～8%, and light calcium carbonate 6%～8% and other content are greater than 0% and be less than or equal to 5% material.This slag former has fusing soon, and utilization ratio is high, the advantage of protection furnace lining and recycling steel-smelting sewage sludge.But this patent does not illustrate its concrete slagging method and effect; And can find out from the composition of this composite fluxing medium, its main component is sludge ball of steel smelting, because sludge ball of steel smelting has very strong cooling performance, just there was the problem of heat source insufficiency in semi-steel making originally in addition, so add too much sludge ball to carry out the problem that slag making will certainly aggravate the semi-steel making heat source insufficiency, therefore, this slag former is not suitable for semisteel smelting.
In on December 27th, 2000 disclosed No. 1278012 Chinese patent application a kind of method of producing steelmaking slag agent with steel-making converter mud is disclosed.The steel-making composite slag that adopts the method to produce has the industrial wastes such as the converter steeling sludge of recycling, ground dolomite, reduces the characteristics such as steel-making cost.But, this application is mainly the production method of having set forth steelmaking slag agent, does not relate to using method and result of use, and considers that the temperature loss of whole employing sludge ball slag making half steel is too large, therefore, the steelmaking slag agent that makes of the method for this application is not suitable for semisteel smelting.
The name of delivering on periodical " steel-making " on October 5th, 2009 is called the document of " utilizing the forming experiment research of the standby slag former of prepared from steel slag ", disclose a kind of employing moulding process of colding pressing and carried out the forming method of the standby slag former of prepared from steel slag, and investigated consumption of binder, water distribution quantity and forming pressure are rolled into a ball the impact of mechanical property on pressure.This slag former have simultaneously fusing point low, change slag fast, remove the strong characteristics of objectionable impurities ability in steel.But the slag former main component of producing in the document is CaO, and focuses on the properties of research slag former, the result of use of slag former is not carried out the industry checking.
The name of delivering on periodical " steel vanadium titanium " on November 30th, 2000 is called the document of " development and the application of climbing steel steel-making composite fluxing medium ", disclose a kind of slag former of designing according to the characteristics of semi-steel making, and verified that by simultaneous test the composite fluxing medium main component is (weight percent) SiO
2(47.30%), Al
2O
3(7.58%), initial stage slag formation time is 4.97min when CaO (11.66%), MnO (7.67%), can shorten initial stage slag formation time 0.73min than the simultaneous test heat, uses simultaneously this slag former to have dephosphorization and desulfurization ability preferably.But, the test effect of composite fluxing medium from the document, initial stage slag formation time is partially long, and in slag, the free oxidation calcium contents is still higher, and the not well fusing of initial stage slag is described, still has the space that promotes metallurgical effect.
Summary of the invention
For the deficiency that prior art exists, one of purpose of the present invention is to solve above-mentioned one or more problems of the prior art.The invention provides a kind of semi-steel making with the slagging method of slag former and semi-steel making, use the present invention can shorten initial stage slag formation time and pure oxygen blow duration, and the problem that slagging is slow, dephosphorization rate is low can effectively solve semisteel smelting the time, and improved the dephosphorization efficient of semisteel smelting.
An aspect of of the present present invention provides a kind of semi-steel making slag former.Described slag former comprises 60%～75% SiO by weight percentage
2, 10%～15% CaO, 1%～3% MgO, 7%～15% FeO, 1%～3% Fe
2O
3And a small amount of inevitably impurity.The size composition by weight percentage of described slag former can for: granularity is accounting for more than 95% of 15mm～35mm, and granularity is less than 5% less than 5mm's.
Another aspect of the present invention provides a kind of slagging method of semi-steel making.Described slagging method comprises: adopt semi-steel making as above to carry out slag making with slag former, quickened lime and high magnesium lime when the converter smelting half steel, after the blowing beginning, described slag former is all added converter disposable adding, and quickened lime and high magnesium lime are added converter in two batches, wherein, first quickened lime that adds and high magnesium lime and described slag former add converter simultaneously.
Another aspect of the present invention provides a kind of slagging method of semi-steel making.Described slagging method comprises: adopt semi-steel making as above to carry out slag making with slag former, quickened lime and high magnesium lime when the converter smelting half steel, will add in two batches converter by the slag making raw material that described slag former, quickened lime and high magnesium lime form after the blowing beginning.
Compared with prior art, beneficial effect of the present invention is to overcome the problem that slagging speed is slow, dephosphorization rate is low that exists when smelting with the half steel after vanadium-bearing hot metal desulfurization vanadium extraction, and can effectively shorten initial stage slag formation time and pure oxygen blow duration, and improve converter terminal liquid steel dephosphorization rate.
Embodiment
Hereinafter, describe in connection with exemplary embodiment the slagging method that semi-steel making of the present invention is used slag former and semi-steel making in detail.In the present invention, if there is no the statement of exception, all solid-state and fluent meterials (for example, slag former, quickened lime, high magnesium lime, steel-making are with the element sulphur in sludge ball and steel or molten steel and phosphoric etc.) percentage ratio be weight percentage, the percentage ratio of all gaseous substances (for example, oxygen) is percent by volume.
Comprise by weight percentage 60%～75% SiO with slag former according to the semi-steel making of first aspect present invention
2, 10%～15% CaO, 1%～3% MgO, 7%～15% FeO, 1%～3% Fe
2O
3And a small amount of inevitably impurity.The size composition by weight percentage of described slag former can for: granularity is accounting for more than 95% of 15mm～35mm, and granularity is less than 5% less than 5mm's.Slag former of the present invention contains higher SiO
2, half steel is because silicone content is vestige, the silicon oxidation phase can not form a large amount of SiO
2Promotionization slag, and higher SiO in slag former
2Can form the lower silicate of fusing point with CaO at the smelting initial stage, accelerate the dissolving of lime, the promotionization slag.The oxide compound that contains the iron of 15% left and right in slag former simultaneously also can accelerate the dissolving of lime, and two main components have promoted the fusing of slag jointly, have shortened initial stage slag formation time.If SiO in slag former
2Too high levels can make the initial stage basicity of slag too low, or consumes more lime to reach suitable basicity; As SiO in slag former
2Content is too low, there is no the effect of obvious promotionization slag.If the oxide compound of iron (for example, sludge ball of steel smelting) too high levels can make the half steel temperature drop excessive, if the oxide content of iron is too low, being unfavorable for slag.It is mainly for after it is added converter that the granularity of slag former is remained between 15mm～35mm, it is melted faster, if granularity is meticulous or be powdery, the adition process dust is excessive, simultaneously it is added to form one deck lime powder after converter and be layered on the molten steel face or form lime and waste time, thereby affect fusing prolongationization slag time of lime; If the granularity of slag former is greater than 35mm, its burn-off rate reduces.
Comprise according to the slagging method of the semi-steel making of second aspect present invention: adopt semi-steel making as above to carry out slag making with slag former, quickened lime and high magnesium lime when the converter smelting half steel, all add converter with described slag former is disposable after blowing beginning, and quickened lime and high magnesium lime are added converter in two batches, wherein, first quickened lime that adds and high magnesium lime and described slag former add converter simultaneously.The slagging method of described semi-steel making according to a further aspect of the invention preferably mainly is applicable to produce the steel grade to phosphorus, sulphur content less demanding (for example, lower than 0.025%) in molten steel.
Comprise according to the slagging method of the semi-steel making of third aspect present invention: adopt semi-steel making as above to carry out slag making with slag former, quickened lime and high magnesium lime when the converter smelting half steel, will add in two batches converter by the slag making raw material that described slag former, quickened lime and high magnesium lime form after the blowing beginning.The slagging method of described semi-steel making according to third aspect present invention preferably mainly is applicable to adopt the large quantity of slag to smelt technique low-phosphorous, the low-sulfur steel grade, for example, described slagging method can be used for producing the steel grade to the content requirement lower (for example, lower than 0.01%) of p and s in molten steel.
In an exemplary embodiment according to the slagging method of the semi-steel making of second aspect present invention or the third aspect, the total amount that adds of described slag former can meet following formula:
W1＝(W2×η
1+W3×η
4)/[R(η
2-η
3)]
Wherein, W1 is the slag former weight that half steel per ton adds, and unit is Kg/ ton half steel;
W2 is the weight of the quickened lime that adds of half steel per ton, and unit is Kg/ ton half steel;
W3 is the weight of the high magnesium lime that adds of half steel per ton, and unit is Kg/ ton half steel;
R bessemerizes the basicity that the requirement of terminal point slag reaches, and R gets 3.5～4.5;
η
1Be the mass percent of CaO in the quickened lime that adds, unit is %;
η
2Be SiO in the slag former that adds
2Mass percent, unit is %;
η
3Be the mass percent of CaO in the slag former that adds, unit is %;
η
4Be the mass percent of CaO in the high magnesium lime that adds, unit is %.
In the present invention; basicity is arranged in 3.5～4.5 scope; mainly to guarantee that slag has certain viscosity in order to have at slag preferably in dephosphorization, desulfuration efficiency; to satisfy the needs of slag splashing; can cause slag viscosity large if basicity is too high; when spattering slag, slag can not well splash on furnace lining with the protection furnace lining; if basicity is too low slag desulfurization, dephosphorization efficient is poor and slag does not have certain viscosity; spatter at the slag on furnace lining and can not well be bonded on furnace lining, do not have equally the effect of slag splashing.
In an exemplary embodiment according to the slagging method of the semi-steel making of second aspect present invention or the third aspect, the total amount that adds of described quickened lime can be 25～50Kg/ ton steel, and described quickened lime can contain the CaO over 85% by weight percentage; The total amount that adds of described high magnesium lime can be 15～25Kg/ ton steel, and described high magnesium lime can contain 45%～55% CaO and 30%～50% MgO by weight percentage.
In an exemplary embodiment according to the slagging method of the semi-steel making of second aspect present invention, the add-on of the described quickened lime that first adds can account for 70%～80% of the total add-on of quickened lime, described first adds the add-on of high magnesium lime can account for 65%～75% of the total add-on of high magnesium lime, and basicity of slag can be controlled between 2～2.5, and when the blowing oxygen quantity of semisteel smelting reach be blown in whole semisteel smelting process amount of oxygen 65%～75% the time, can add second batch quickened lime and high magnesium lime.Here, basicity of slag being controlled between 2～2.5, is mainly because have best dephosphorization efficient when this basicity zone, and greater than 2.5 or less than 2 the time, dephosphorization efficient all reduces when basicity of slag.Here, why be blown in the blowing oxygen quantity of semisteel smelting reaches whole semisteel smelting process amount of oxygen 65%～75% the time add second batch quickened lime and high magnesium lime, because early stage, slag was changed already at this moment, and reached best dephosphorization effect, add the second batch slag charge can further promote dephosphorization and suppress rephosphorization this moment.
in an exemplary embodiment according to the slagging method of the semi-steel making of third aspect present invention, the add-on of the described slag former that first adds can account for 60～70% of the total add-on of described slag former, the add-on of the quickened lime that first adds can account for 65%～75% of the total add-on of quickened lime, the add-on of the high magnesium lime that first adds can account for 50%～60% of the total add-on of high magnesium lime, and when the blowing oxygen quantity of semisteel smelting reach be blown in whole semisteel smelting process amount of oxygen 60%～70% the time, can add second batch slag making raw material.
In an exemplary embodiment according to the slagging method of the semi-steel making of second aspect present invention or the third aspect, described slagging method also be included in into stove half steel temperature greater than 1350 ℃ and carbon content greater than 3.60% the time, add the steel-making of 4～8Kg/ ton steel to use sludge ball in converter in the time of blowing 2min after adding first slag making raw material, described steel-making contains 25wt%～40wt% ferriferous oxide by weight percentage with sludge ball.Here, described steel-making sludge ball is converter steelmaking refrigerant commonly used, and difference is that the steel-making used in the present invention is with containing the very ferriferous oxide of high-content in sludge ball.Preferably, the steel-making of using in the present invention contains 11%～20% CaO, 5%～10% SiO by weight percentage with sludge ball
2, 5%～10% MgO, 25%～40% ferriferous oxide, all the other are moisture and inevitable impurity.In slagging method of the present invention, add steel-making can play the reduction bath temperature with sludge ball, slow down reaction between carbon and oxygen speed in stove, make the molten bath temperature rise rate be unlikely to too fast, and make the molten bath in the effect of the long residence time of cold zone (1400 ℃～1500 ℃) maintenance, thereby can further improve the effect of low temperature dephosphorization in early stage.
In an exemplary embodiment according to the slagging method of the semi-steel making of second aspect present invention or the third aspect, before described slagging method also is included in converter tapping, add slag supplying agent with the residue adjustment operation of working the slag viscosity in converter, thereby the lower quantity of slag when reducing tapping and the operation of assurance slag splashing are to the requirement of slag viscosity.
Below, further describe in connection with embodiment and Comparative Examples the slagging method that semi-steel making of the present invention is used slag former and semi-steel making.
Embodiment 1:
Semisteel smelting 45# carbon constructional quality steel after the employing vanadium extraction, molten steel require phosphorus, sulphur content all lower than 0.025%.The 135t half steel is blended into the 120t converter to be smelted and adopts according to the slagging method of the semi-steel making of second aspect and smelt.
Entering stove half composition of steel is: the C of 3.5wt%, and the Mn of 0.042wt%, the P of 0.088wt%, the V of 0.015wt%, the S of 0.009wt%, Si are vestige, its surplus is Fe.The half steel temperature is 1335 ℃.Adopt 5 hole oxygen rifles to blow, oxygen supply intensity is 3.1～4.0Nm
3/ tmin.Add when blowing whole semi-steel makings with slag formers and first quickened lime and high magnesium lime opening, wherein, the add-on of quickened lime (CaO that contains 88wt%) is 20Kg/t
Half steel, the add-on of high magnesium lime (containing the CaO of 45wt% and the MgO of 30wt%) is 10kg/t
Half steelSemi-steel making is 8.26kg/t with the add-on of slag former
Half steel, its composition is: the SiO of 60wt%
2, 15wt% FeO, the Fe of 3wt% of MgO, 15wt% of CaO, 3wt%
2O
3With the inevitable impurity of surplus.
Blowing oxygen quantity reach be blown in whole semisteel smelting process amount of oxygen 65% the time, add the second batch slag making materials, wherein, the add-on of quickened lime (CaO that contains 88wt%) is 8Kg/t
Half steel, the add-on of high magnesium lime (containing the CaO of 45wt% and the MgO of 30wt%) is 5kg/t
Half steelThen, residue adjustment tapping, during tapping in molten steel phosphorus content be 0.07%.
Recording initial stage slag formation time is 3.01min, and in the terminal point slag, the content of free cao is 7.13wt%, and visible slag fusing is respond well.And pure oxygen blow duration is 11.62min, and the smelting process dephosphorization rate is 92.05%.
Embodiment 2:
Semisteel smelting P72LX steel after the employing vanadium extraction, molten steel require phosphorus, sulphur content all lower than 0.01%.The 138t half steel is blended into the 120t converter to be smelted and adopts according to the slagging method of the semi-steel making of the third aspect and smelt.
Entering stove half composition of steel is: the C of 3.46wt%, and the Mn of 0.038wt%, the P of 0.076wt%, the V of 0.012wt%, the S of 0.003wt%, Si are vestige, its surplus is Fe.The half steel temperature is 1328 ℃.Adopt 5 hole oxygen rifles to blow, oxygen supply intensity is 3.1～4.0Nm
3/ tmin.To add in two batches converter with the slag making materials that slag former, quickened lime and high magnesium lime form by semi-steel making.Add first slag making materials when blowing opening, wherein, the add-on of quickened lime (CaO that contains 86wt%) is 35Kg/t
Half steel, the add-on of high magnesium lime (containing the CaO of 55wt% and the MgO of 50wt%) is 10kg/t
Half steel, semi-steel making is 9.76kg/t with the add-on of slag former
Half steel, and semi-steel making with the slag former composition is: the SiO of 75wt%
2, the FeO of MgO, 7wt% of CaO, 1wt% of 10wt% and the Fe of 1wt%
2O
3With the inevitable impurity of surplus.
Blowing oxygen quantity reach be blown in whole semisteel smelting process amount of oxygen 60% the time, add the second batch slag making materials, wherein, the add-on of quickened lime (CaO that contains 86wt%) is 15Kg/t
Half steel, the add-on of high magnesium lime (containing the CaO of 55wt% and the MgO of 50wt%) is 10kg/t
Half steel, semi-steel making is 4.62kg/t with the add-on of slag former (semi-steel making in its composition and the present embodiment in first is identical with slag former)
Half steelDuring to smelting endpoint, adopt slag supplying agent to adjust slag viscosity, and outwell the part slag, in endpoint molten steel, phosphorus content is 0.005%, and sulphur content is 0.005%.
Recording initial stage slag formation time is 2.38min, and in the terminal point slag, the free oxidation calcium contents is 6.85wt%, and pure oxygen blow duration is 11.48min, and the converter steelmaking process dephosphorization rate is 93.42%.
Embodiment 3:
Semisteel smelting 50 carbon constructional quality steels after the employing vanadium extraction, molten steel require phosphorus, sulphur content all lower than 0.025%.The 140t half steel is blended into the 120t converter to be smelted and adopts according to the slagging method of the semi-steel making of second aspect and smelt.
Entering stove half composition of steel is: the C of 3.63wt%, and the Mn of 0.048wt%, the P of 0.068wt%, the V of 0.018wt%, the S of 0.0010wt%, Si are vestige, its surplus is Fe.The half steel temperature is 1360 ℃.Adopt 5 hole oxygen rifles to blow, oxygen supply intensity is 3.1～4.0Nm
3/ tmin.Add when blowing whole semi-steel makings with slag formers and first quickened lime and high magnesium lime opening, wherein, the add-on of quickened lime (CaO that contains 87wt%) is 20Kg/t
Half steel, the add-on of high magnesium lime (containing the CaO of 50wt% and the MgO of 40wt%) is 15kg/t
Half steelSemi-steel making is 9.06kg/t with the add-on of slag former
Half steel, its composition is: the SiO of 68wt%
2, 13wt% FeO, the Fe of 2wt% of MgO, 11wt% of CaO, 2wt%
2O
3With the inevitable impurity of surplus.
Add steel-making sludge ball 6Kg/t after blowing 1min
Half steelThis steel-making contains 15% CaO, 8% SiO with sludge ball
2, 7% MgO, 33% ferriferous oxide and surplus moisture and inevitable impurity.Blowing oxygen quantity reach be blown in whole semisteel smelting process amount of oxygen 75% the time, add the second batch slag making materials, wherein, the add-on of quickened lime (CaO that contains 87wt%) is 10Kg/t
Half steel, the add-on of high magnesium lime (containing the CaO of 50wt% and the MgO of 40wt%) is 5kg/t
Half steelThen, residue adjustment tapping, during tapping in molten steel phosphorus content be 0.05%.
Recording initial stage slag formation time is 2.87min, and in the terminal point slag, the content of middle free cao is 7.05wt%, and visible slag fusing effect is fine.And pure oxygen blow duration is 11.79min, and the smelting process dephosphorization rate is 92.65%.
Comparative Examples 1:
Method by embodiment 1 is carried out converter steelmaking, and difference is that the converter slag-making material all once adds converter, and the composition of slag former is different with content, adopts composite fluxing medium commonly used, and its composition is: the SiO of 49wt%
2, 10wt% FeO, the Fe of 7wt% of MgO, 7wt% of CaO, 4wt%
2O
3, 6wt% Al
2O
3, the C of 3wt% and surplus moisture and inevitable impurity.Found that, initial stage slag formation time is 3.89min, in the terminal point slag in free terminal point slag the content of free cao be 8.68wt%, illustrate that slag fusing effect is not fine, pure oxygen blow duration is 12.82min, the smelting process dephosphorization rate is 88.39%.
Comparative Examples 2:
Method by embodiment 2 is carried out converter steelmaking, difference is that the second batch slag making materials is blowing 4min (namely, blowing oxygen quantity be about be blown in the semi-steel making process amount of oxygen 30%～40%) after add, and the composition of slag former is different, the main component of this slag former is: the SiO of 45wt%
2, 13wt% FeO, the Fe of 9wt% of MgO, 10wt% of CaO, 3wt%
2O
3, 5wt% Al
2O
3, the C of 2wt% and surplus moisture and inevitable impurity.Found that, initial stage slag formation time is 3.64min, in the terminal point slag in free terminal point slag the content of free cao be 8.52wt%, illustrate that slag fusing effect is not fine, pure oxygen blow duration is 12.73min, the smelting process dephosphorization rate is 89.67%.
Comparative Examples 3:
Method by embodiment 3 is carried out converter steelmaking, and difference is to change cooling material into steel scrap by described steel-making with sludge ball, and the composition of slag former is different, and the main component of this slag former is: the SiO of 50wt%
2, 12wt% FeO, the Fe of 10wt% of MgO, 11wt% of CaO, 4wt%
2O
3, 3wt% Al
2O
3, the C of 3wt% and surplus moisture and inevitable impurity.Found that, initial stage slag formation time is 3.89min, and in the terminal point slag, the content of free cao is 8.98wt%, illustrates that slag fusing effect is not fine, and pure oxygen blow duration is 12.86min, and the smelting process dephosphorization rate is 86.43%.
As can be seen from the above Examples and Comparative Examples, use slag former provided by the invention and slagging method thereof can effectively shorten initial stage slag formation time and pure oxygen blow duration, and can improve the converter dephosphorization rate.
In sum, adopt semi-steel making of the present invention to carry out semi-steel making production with the slagging method of slag former and semi-steel making, the problem that slagging speed is slow, dephosphorization rate is low that exists in the time of can overcoming semisteel smelting, and can effectively shorten initial stage slag formation time and pure oxygen blow duration, and improve converter terminal liquid steel dephosphorization rate.
Although the above has described the present invention in conjunction with some exemplary embodiments, it will be apparent to those skilled in the art that and to modify and to change above-mentioned exemplary embodiment in the situation that do not break away from the spirit and scope that claim limits.
Claims (8)
1. a semi-steel making slag former, is characterized in that described slag former is 68% ~ 75% SiO by weight percentage
2, 10% ~ 15% CaO, 1% ~ 3% MgO, 7% ~ 15% FeO, 1% ~ 3% Fe
2O
3And a small amount of inevitably impurity,
Wherein, the size composition by weight percentage of described slag former is: granularity is accounting for more than 95% of 15mm ~ 35mm, and granularity is less than 5% less than 5mm's.
2. the slagging method of a semi-steel making, it is characterized in that described slagging method comprises: adopt semi-steel making as claimed in claim 1 to carry out slag making with slag former, quickened lime and high magnesium lime when the converter smelting half steel, after the blowing beginning, described slag former is all added converter, and quickened lime and high magnesium lime are added converter in two batches, wherein, first quickened lime that adds and high magnesium lime and described slag former add converter simultaneously.
3. slagging method as claimed in claim 2, the add-on that it is characterized in that the described quickened lime that first adds accounts for 70% ~ 80% of the total add-on of quickened lime, described first adds the add-on of high magnesium lime to account for 65% ~ 75% of the total add-on of high magnesium lime, and basicity of slag is controlled between 2 ~ 2.5, and when the blowing oxygen quantity of semisteel smelting reach be blown in whole semisteel smelting process amount of oxygen 65% ~ 75% the time, add second batch quickened lime and high magnesium lime.
4. the slagging method of a semi-steel making, it is characterized in that described slagging method comprises: adopt semi-steel making as claimed in claim 1 to carry out slag making with slag former, quickened lime and high magnesium lime, will add in two batches converter by the slag making raw material that described slag former, quickened lime and high magnesium lime form after the blowing beginning when the converter smelting half steel.
5. slagging method as described in claim 2 or 4, is characterized in that the total amount that adds of described quickened lime is 25 ~ 50Kg/ ton steel, and described quickened lime contains the CaO over 85% by weight percentage; The total amount that adds of described high magnesium lime is 15 ~ 25Kg/ ton steel, and described high magnesium lime contains 45% ~ 55% CaO and 30% ~ 50% MgO by weight percentage.
6. slagging method as claimed in claim 4, it is characterized in that in described slagging method, the add-on of the described slag former that first adds accounts for 60 ~ 70% of the total add-on of described slag former, the add-on of the quickened lime that first adds accounts for 65% ~ 75% of the total add-on of quickened lime, the add-on of the high magnesium lime that first adds accounts for 50% ~ 60% of the total add-on of high magnesium lime, and when the blowing oxygen quantity of semisteel smelting reach be blown in whole semisteel smelting process amount of oxygen 60% ~ 70% the time, add second batch slag making raw material.
7. slagging method as described in claim 2 or 4, it is characterized in that described slagging method also be included in into stove half steel temperature greater than 1350 ℃ and carbon content greater than 3.60% the time, add the steel-making of 4 ~ 8Kg/ ton steel to use sludge ball in converter in the time of blowing 2min after adding first slag making raw material, described steel-making contains 25wt% ~ 40wt% ferriferous oxide by weight percentage with sludge ball.
8. slagging method as described in claim 2 or 4, before it is characterized in that described slagging method also is included in converter tapping, add slag supplying agent with the residue adjustment operation of working the slag viscosity in converter, thereby the lower quantity of slag when reducing tapping and the operation of assurance slag splashing are to the requirement of slag viscosity.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102912068B (en) * | 2012-10-19 | 2014-03-26 | 攀钢集团攀枝花钢钒有限公司 | Slagging agent for semisteel converter steelmaking and manufacturing method thereof |
| CN103146873B (en) * | 2013-03-29 | 2015-11-18 | 攀钢集团攀枝花钢铁研究院有限公司 | The semi-steel making slagging method of enrichment sludge ball and semi-steel making |
| CN103290163B (en) * | 2013-06-05 | 2014-09-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel steelmaking method |
| CN103320566B (en) * | 2013-06-26 | 2015-09-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Double slag process smelts the method for half steel |
| CN103484596B (en) * | 2013-09-30 | 2015-09-09 | 攀钢集团攀枝花钢铁研究院有限公司 | Half steel slag former and preparation method thereof and Semi-steel making method |
| CN103667583B (en) * | 2013-12-27 | 2016-02-03 | 魏周 | A kind of preparation method using slag former that makes steel |
| CN103966388B (en) * | 2014-04-28 | 2015-09-30 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method shortening the semisteel converter steelmaking of pure oxygen blow duration |
| CN103966399B (en) * | 2014-05-06 | 2016-08-10 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of semisteel smelting medium carbon steel |
| CN106244766B (en) * | 2016-08-02 | 2018-07-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi-steel making slag former and semi-steel making slagging method |
| CN106755714B (en) * | 2016-11-24 | 2018-07-10 | 攀钢集团攀枝花钢钒有限公司 | The method that converter carries out double slag process smelting using corundum slag |
| CN107151725A (en) * | 2017-05-09 | 2017-09-12 | 攀钢集团攀枝花钢铁研究院有限公司 | The method that carbon is protected in semisteel smelting dephosphorization |
| CN113088617B (en) * | 2021-04-09 | 2022-05-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Converter steelmaking method |
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| CN101613779B (en) * | 2008-06-25 | 2011-06-15 | 攀钢集团钢铁钒钛股份有限公司 | Slagging agent, preparation method and use method thereof |
| CN101928806B (en) * | 2009-06-26 | 2013-02-13 | 攀钢集团攀枝花钢铁研究院有限公司 | Composite slagging agent for semi-steel making and preparation method thereof and semi-steel making method |
| CN101962698B (en) * | 2009-07-24 | 2012-02-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel converter steelmaking method |
| CN102071277B (en) * | 2010-12-23 | 2012-10-24 | 攀钢集团钢铁钒钛股份有限公司 | Converter dephosphorizing and steelmaking method |
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