CN104060049B - A kind of desulfurization dephosphorization agent and half steel be the method for desulfurization dephosphorization simultaneously - Google Patents
A kind of desulfurization dephosphorization agent and half steel be the method for desulfurization dephosphorization simultaneously Download PDFInfo
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Abstract
The invention discloses a kind of desulfurization dephosphorization agent, wherein, this desulfurization dephosphorization agent contains lime, sodium salt and passivated magnesium; With respect to the lime of 100 weight portions, the content of described sodium salt is 10-30 weight portion, and the content of described passivated magnesium is 15-40 weight portion. The invention also discloses a kind of half steel method of desulfurization dephosphorization simultaneously, the method comprises: in the half steel of molten condition, add desulfurization dephosphorization agent to carry out desulfurization dephosphorization, wherein, described desulfurization dephosphorization agent is above-mentioned desulfurization dephosphorization agent. By technique scheme, shorten the processing time to half steel desulfurization and dephosphorization, processing finishes rear half steel temperature by little, has saved total inventory, has reduced the pollution to environment. In addition, owing to carrying out dephosphorization in desulfurization, no longer need extra equipment investment, saved operating procedure and processing cost.
Description
Technical field
The present invention relates to a kind of desulfurization dephosphorization agent, and a kind of half steel method of desulfurization dephosphorization simultaneously.
Background technology
Along with the development of steel and iron industry, more and more higher to the quality requirement of steel. And sulphur and phosphorus be in steelMain objectionable impurities element, can reduce the performance of steel greatly, therefore, for low-sulfur, Low-phosphorus SteelDemand constantly increases.
At present, in advanced steel and iron industry country, particularly Japan, has carried out hot metal pretreatment technologyA large amount of research, technology maturation. Advanced steel mill of China, as Baosteel, Wuhan Iron and Steel Plant etc., has also applied molten ironPreconditioning technique, and its sulfur removal technology is mature on the whole.
Since 1980, for the pre-dephosphorization problem of molten iron, develop various processing methods, the most representativeHave two kinds: a kind of is to carry out dephosphorization containing in the ladle of molten iron or fish torpedo ladle, and another kind is in converterInside carry out dephosphorization of molten iron pretreatment, these two kinds of methods have all obtained commercial Application. The Dephosphorising agent of two kinds of methodsComposition is all mainly: with respect to the lime of 100 weight portions, di-iron trioxide is 110 weight portions, fluoriteBe 29 weight portions.
But ladle or fish torpedo ladle dephosphorization mainly contain, and temperature drop is large, when oxygen blast compensation temperature drop splash tight especially againHeavy, the molten iron processing time is long affects production run and easily causes environmental pollution that (in fluorite, fluorinated volumeHeight, environmental pollution is more serious) etc. problem, applicable cases is undesirable. In converter, carry out dephosphorization of molten ironPretreated equipment investment is larger, and the processing time is also longer.
Therefore, need badly a kind of, temperature short to the molten iron processing time of exploitation by little, environmental pollution is little and costLow method of half steel being carried out to desulfurization and dephosphorization.
Summary of the invention
The object of the invention is in the technology in order to overcome existing half steel desulfurization and dephosphorization, when molten iron is processedBetween long, temperature by defect large, big for environment pollution and that cost is high, provide a kind of short to the molten iron processing time,Warm by desulfurization dephosphorization agent little, that environmental pollution is little and cost is low, and use this desulfurization dephosphorization agent half-and-halfSteel carries out the method for desulfurization dephosphorization simultaneously.
The present inventor is surprised to find that under study for action, will contain the mixed of lime, sodium salt and passivated magnesiumCompound material adds in the half steel of melting, and with respect to the lime of 100 weight portions, the containing of described sodium saltAmount is 10-30 weight portion, and when the content of described passivated magnesium is 15-40 weight portion, described mixed material is notBut can play good desulfidation to half steel, can also effectively remove the phosphorus in half steel,Play the effect of desulfurization dephosphorization unexpected time, greatly shortened the time of desulfurization dephosphorization. AndUse this while desulfurization dephosphorization agent, in processing procedure, molten iron temperature is by little, and environmental pollution is little, processesCost is also lower.
Based on above discovery, the invention provides a kind of desulfurization dephosphorization agent, wherein, this desulfurization dephosphorization agent containsThere are lime, sodium salt and passivated magnesium; With respect to the lime of 100 weight portions, the content of described sodium salt is 10-30Weight portion, the content of described passivated magnesium is 15-40 weight portion.
Preferably, described desulfurization dephosphorization agent also contains calcium carbonate; More preferably, with respect to 100 weight portionsLime, the content of described calcium carbonate is 2.5-3.5 weight portion.
Preferably, the grain diameter of described desulfurization dephosphorization agent is not more than 1mm, and at least 85 % by weightThe grain diameter of described desulfurization dephosphorization agent is not less than 0.1mm.
The present invention also provides a kind of half steel method of desulfurization dephosphorization simultaneously, and the method comprises: in moltenIn the half steel of state, add desulfurization dephosphorization agent to carry out desulfurization dephosphorization, wherein, described desulfurization dephosphorization agent is above-mentioned instituteThe desulfurization dephosphorization agent of stating.
By above-mentioned technical scheme of half steel being carried out desulfurization dephosphorization simultaneously, shorten significantly half steel de-The processing time of sulphur and dephosphorization, and owing to only once feeding intake, reduced temperature by number of times, therefore,Temperature will be less, also save total inventory. This desulfurization dephosphorization agent does not contain fluorine than prior art,Therefore, reduced the pollution to environment. In addition, owing to carrying out dephosphorization in desulfurization, no longer needExtra equipment investment, has saved operating procedure and processing cost.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Detailed description of the invention
Below the specific embodiment of the present invention is elaborated. Should be understood that, retouch in this placeThe detailed description of the invention of stating only, for description and interpretation the present invention, is not limited to the present invention.
The invention provides a kind of desulfurization dephosphorization agent, wherein, this desulfurization dephosphorization agent contain lime, sodium salt andPassivated magnesium; With respect to the lime of 100 weight portions, the content of described sodium salt is 10-30 weight portion, described inThe content of passivated magnesium is 15-40 weight portion.
The present inventor finds, when prior art is why different to containing sulfur impurity and foreign matter of phosphorSample, for example, half steel carries out while desulfurization dephosphorization, be mainly because, when independent use desulfurizing agent or de-When phosphorus agent, all can make described sample obtain higher desulfurized effect or dephosphorization effect. But work as desulfurizing agentWhile mixing as desulfurization dephosphorization use simultaneously with Dephosphorising agent, not only can not reach they are used separatelyTime desulfurization dephosphorization effect, can make on the contrary their original desulfurization or dephosphorization effect greatly reduce.
The present inventor finds by a large amount of research, by by lime, sodium salt and passivated magnesium upperState in proportion and be used in conjunction with, can make to act synergistically between each material, make described desulfurization de-Phosphorus agent has the effect of desulfurization and dephosphorization higher time. And, ensureing under the prerequisite of molten iron flow,In desulfurization dephosphorization agent of the present invention, do not contain fluorine, make in the process of desulfurization at the same time and dephosphorization, to environmentPollution also obtained effectively reducing.
Preferably, in described desulfurization dephosphorization agent, with respect to the lime of 100 weight portions, described sodium saltContent is 14.5-22 weight portion, and the content of described passivated magnesium is 20-35 weight portion. When by above each thingWhen the content of matter is controlled in this preferred content range, in further reducing environmental pollution,The effect of desulfurization dephosphorization has also obtained further raising.
In the present invention, preferably, in described lime, CaO content >=89 % by weight; In described passivationIn magnesium, CaF2Content >=98 % by weight.
In the present invention, the kind of described sodium salt is had no particular limits. Under preferable case, described sodium saltFor sodium carbonate. In this preferred situation, when described desulfurization dephosphorization agent, desulfurization dephosphorization effect is passableBe further enhanced.
According to the present invention, although above-mentioned each material is mixed and can be reached according to ratio of the present inventionThe effect of comparatively ideal while desulfurization dephosphorization. But under preferable case, when described desulfurization dephosphorization agent also contains carbonWhen acid calcium, can further improve desulfurization dephosphorization rate.
According to the present invention, for the content of calcium carbonate, those skilled in the art can be according to actual production feelingsCondition is selected. Preferably, with respect to the lime of 100 weight portions, the content of described calcium carbonate is 2.5-3.5Weight portion.
In the present invention, in order to play better desulfurization dephosphorization effect, the grain graininess of described desulfurization dephosphorization agentBe not more than 1mm, and the grain graininess of the described desulfurization dephosphorization agent of at least 85 % by weight is not less than 0.1mm.Described granularity refers to particle size, refers to the maximum linear distance between two differences on particle. ExampleAs, the granularity in described Dephosphorising agent refers to its particle size, when described particle is while being spherical, and described grainDegree refers to its diameter.
On the other hand, the invention provides a kind of half steel method of desulfurization dephosphorization simultaneously, the method comprises:In the half steel of molten condition, add desulfurization dephosphorization agent to carry out desulfurization dephosphorization, wherein, described desulfurization dephosphorization agentFor desulfurization dephosphorization agent as above.
In the present invention, have no particular limits for the addition of described desulfurization dephosphorization agent, for example, when halfWhen silicon (silicon in half steel is preferentially oxidized with respect to phosphorus) content in steel is higher, can suitably improve instituteStating the addition of desulfurization dephosphorization agent, for example, can be 10kg with respect to half steel per ton, when the silicon in half steelWhen content is lower, contrary, for example, can be 5kg with respect to half steel per ton. Preferably, with respect toHalf steel per ton, the addition of described desulfurization dephosphorization agent is 5-8kg.
Described half steel can be the various half steels of this area routine. For the desulfurization that further improves half steel takes offPhosphorus effect, half steel described in the present invention is preferably the half steel after vanadium extraction by converter blowing, and it is heavy that described half steel contains 1-5Carbon, the silicon of 0.01-0.025 % by weight, the manganese of 0.01-0.025 % by weight, the 0.01-0.025 % by weight of amount %Vanadium, 0.01-0.025 % by weight titanium, 0.05-0.1 % by weight phosphorus, 0.05-0.12 % by weight sulphur andThe iron of 94.7-98.8 % by weight. The method of described vanadium extraction by converter blowing is conventionally known to one of skill in the art, at thisRepeat no more.
According to the present invention, it can be the each of this area routine that described desulfurization dephosphorization agent adds the mode in half steelPlant and add mode, for example, can add by the mode of half cylinder of steel winding-up. The speed of described winding-up is passableFor parameter well known in the art, for example, with respect to half steel per ton, the speed of described winding-up can be40-60kg/min。
According to the present invention, the condition of described desulfurization dephosphorization can be the bar of desulfurization dephosphorization well known in the artPart, for example, the condition of described desulfurization dephosphorization comprises: the initial temperature of half steel can be 1315-1380 DEG C,Time can be 15-40 minute, also can be according to the suitable prolongation of actual desulfurization dephosphorization effect or shorteningThe desulfurization dephosphorization time.
According to general steel grade requirement, in most of steel grades, requiring sulfur content is 0.01-0.035 % by weight, phosphorusContent is 0.01-0.035 % by weight, adopts desulfurization dephosphorization agent of the present invention to carry out while desulfurization to half steel de-Phosphorus, not only can effectively improve the desulfurization dephosphorization effect of half steel, and sulfur content and phosphorus in gained half steel are containedAmount is effectively controlled at the requirement to sulfur content and phosphorus content in most of steel grades, and, owing to only needing oneInferior feeding intake can realize the effect of desulfurization dephosphorization simultaneously, reduced the cooling number of times of half steel, therefore, and temperatureDegree changes less, has also saved inventory simultaneously; Also simplify in addition operating procedure, improved equipmentUtilization rate, thus cost reduced.
Below will describe the present invention by embodiment. In following examples and comparative example,
The manganese, 0.025 of the carbon that half steel 1 contains 3.98 % by weight, the silicon of 0.025 % by weight, 0.025 % by weightThe phosphorus of the vanadium of % by weight, the titanium of 0.025 % by weight, 0.095 % by weight, the sulphur and 95.715 of 0.11 % by weightIron;
The manganese, 0.02 of the carbon that half steel 2 contains 3.8 % by weight, the silicon of 0.02 % by weight, 0.02 % by weightThe phosphorus of the vanadium of % by weight, the titanium of 0.02 % by weight, 0.07 % by weight, the sulphur of 0.07 % by weight and 95.98Iron;
The manganese, 0.01 of the carbon that half steel 3 contains 3.2 % by weight, the silicon of 0.01 % by weight, 0.01 % by weightThe phosphorus of the vanadium of % by weight, the titanium of 0.01 % by weight, 0.055 % by weight, the sulphur and 96.65 of 0.055 % by weightIron.
Carry out the mensuration of sulfur content according to the assay method of the sulfur content in GB11170-1989.
Carry out the mensuration of phosphorus content according to the assay method of the phosphorus content in GB11170-1989.
Embodiment 1
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel side of desulfurization dephosphorization simultaneouslyMethod.
Adopt mode that half steel fills with winding-up 140 tons of initial temperatures be in the half steel 1 of 1375 DEG C withThe speed of 50kg/min is blown into the desulfurization dephosphorization agent of the present invention of 7.5kg/ ton half steel. Described desulfurization dephosphorization agentBy the lime (CaO content is 90 % by weight) of 100 weight portions, the sodium carbonate, 21.1 of 16.9 weight portionsThe passivated magnesium (MgO content is 98.5 % by weight) of weight portion and the calcium carbonate of 2.8 weight portions composition. AndAnd granularity is all not more than 1mm in described desulfurization dephosphorization, and the ratio that is not less than 0.1mm is 85 weightsAmount %.
Under the initial temperature of 1375 DEG C, described half steel is carried out to while desulfurization dephosphorization 21 minutes. Desulfurization is de-The temperature that phosphorus finishes rear mensuration gained half steel is 1340 DEG C, and temperature drop is 35 DEG C, and sulfur content is 0.013 weight%, phosphorus content is 0.011 % by weight.
Embodiment 2
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel side of desulfurization dephosphorization simultaneouslyMethod.
Adopt mode that half steel fills with winding-up 140 tons of initial temperatures be in the half steel 2 of 1350 DEG C withThe speed of 40kg/min is blown into the desulfurization dephosphorization agent of the present invention of 6.5kg/ ton half steel. Described desulfurization dephosphorization agentBy the lime (CaO content is 89 % by weight) of 100 weight portions, the sodium carbonate, 34.3 of 14.9 weight portionsThe passivated magnesium (MgO content is 99 % by weight) of weight portion and the calcium carbonate of 3 weight portions composition. And,In described desulfurization dephosphorization, granularity is all not more than 1mm, and the ratio that is not less than 0.1mm is 89 % by weight.
Under the initial temperature of 1350 DEG C, described half steel is carried out to while desulfurization dephosphorization 18.2 minutes. DesulfurizationThe temperature that dephosphorization finishes rear mensuration gained half steel is 1310 DEG C, and temperature drop is 40 DEG C, and sulfur content is 0.011% by weight, phosphorus content is 0.011 % by weight.
Embodiment 3
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel side of desulfurization dephosphorization simultaneouslyMethod.
Adopt mode that half steel fills with winding-up 140 tons of initial temperatures be in the half steel 3 of 1315 DEG C withThe speed of 60kg/min is blown into the desulfurization dephosphorization agent of the present invention of 5.5kg/ ton half steel. Described desulfurization dephosphorization agentBy the lime (CaO content is 92 % by weight) of 100 weight portions, the sodium carbonate, 31.3 of 21.9 weight portionsThe passivated magnesium (MgO content is 98.6 % by weight) of weight portion and the calcium carbonate of 3.2 weight portions composition. AndAnd granularity is all not more than 1mm in described desulfurization dephosphorization, and the ratio that is not less than 0.1mm is 93 weightsAmount %.
Under the initial temperature of 1315 DEG C, described half steel is carried out to while desulfurization dephosphorization 15.4 minutes. DesulfurizationThe temperature that dephosphorization finishes rear mensuration gained half steel is 1300 DEG C, and temperature drop is 15 DEG C, and sulfur content is 0.013% by weight, phosphorus content is 0.012 % by weight.
Embodiment 4
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel side of desulfurization dephosphorization simultaneouslyMethod.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, described desulfurizationDephosphorising agent by the sodium carbonate of the lime (CaO content is 90 % by weight) of 100 weight portions, 10 weight portions,The calcium carbonate composition of the passivated magnesium of 40 weight portions and 3 weight portions. Desulfurization dephosphorization finishes the temperature of rear gained half steelDegree is 1340 DEG C, and temperature drop is 35 DEG C, and sulfur content is 0.016 % by weight, and phosphorus content is 0.020 % by weight.
Embodiment 5
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel side of desulfurization dephosphorization simultaneouslyMethod.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, described desulfurizationThe lime (CaO content is 90 % by weight) that Dephosphorising agent contains 100 weight portions, the sodium carbonate of 30 weight portions,The calcium carbonate composition of the passivated magnesium of 15 weight portions and 3 weight portions. Desulfurization dephosphorization finishes the temperature of rear gained half steelDegree is 1320 DEG C, and temperature drop is 55 DEG C, and sulfur content is 0.021 % by weight, and phosphorus content is 0.017 % by weight.
Embodiment 6
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel side of desulfurization dephosphorization simultaneouslyMethod.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, described desulfurizationIn Dephosphorising agent, do not contain calcium carbonate. The temperature that desulfurization dephosphorization finishes rear gained half steel is 1345 DEG C, and temperature drop is30 DEG C, sulfur content is 0.018 % by weight, and phosphorus content is 0.016 % by weight.
Embodiment 7
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel side of desulfurization dephosphorization simultaneouslyMethod.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, described desulfurizationThe ratio that Dephosphorising agent is not more than 1mm and is not less than 0.1mm is 75 % by weight, is greater than the ratio of 1mmBe 10 % by weight, be less than ratio 15 % by weight of 0.1mm. Desulfurization dephosphorization finishes the temperature of rear gained half steelDegree is 1335 DEG C, and temperature drop is 40 DEG C, and sulfur content is 0.021 % by weight, and phosphorus content is 0.020 % by weight.
Comparative example 1
This comparative example is used for the method for the substep desulfurization dephosphorization that prior art is described.
Adopt mode that half steel fills with winding-up 140 tons of initial temperatures be in the half steel 1 of 1375 DEG C withThe speed of 50kg/min is blown into the desulfurizing agent of 7kg/ ton half steel, and described desulfurizing agent is by the lime of 100 weight portionsFluorite (the CaF of (CaO content is 90 % by weight), 9.1 weight portions2Composition is in 98.5 % by weight) andMagnesium powder (MgO composition is in the 95 % by weight) composition of 12.1 weight portions, desulfurization 19.6min.
In half steel after desulfurization, be blown into the Dephosphorising agent of 15kg/ ton half steel with the speed of 50kg/min, described inDephosphorising agent is by the lime (CaO content is 90 % by weight) of 100 weight portions, three oxidations of 110 weight portionsThe passivated magnesium composition of two iron and 29 weight portions, dephosphorization 42min.
The temperature that desulfurization dephosphorization finishes rear gained half steel is 1240 DEG C, and stagnation temperature is reduced to 135 DEG C, and sulfur content is0.015 % by weight, phosphorus content is 0.020 % by weight.
Comparative example 2
This comparative example is for illustrating the desulfurization dephosphorization method of reference.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, described desulfurizationDephosphorising agent is formed according to the weight ratio mixture of 1:1 by desulfurizing agent and the Dephosphorising agent of comparative example 1, after mixingThe mixture as desulfurization dephosphorization agent by lime, the passivated magnesium of 16 weight portions, 8 weights of 100 weight portionsThe di-iron trioxide composition of the magnesium powder of amount part and 37 weight portions. Desulfurization dephosphorization finishes the temperature of rear gained half steelDegree is 1320 DEG C, and temperature drop is 55 DEG C, and sulfur content is 0.030 % by weight, and phosphorus content is 0.035 % by weight.
By relatively can finding out of above embodiment and comparative example 1, adopt desulfurization dephosphorization agent of the present invention,In ensureing desulfurization dephosphorization effect, the time of effectively having reduced desulfurization and dephosphorization; And due to onlyOnce feed in raw material, the temperature of half steel water will also obtain significant reduction, in addition, and due to desulfurization and de-Phosphorus carries out simultaneously, effectively raises the utilization rate of equipment, and has saved feeding quantity. Make to be processed intoThis reduces greatly.
By relatively can finding out of above embodiment 1 and comparative example 2, with de-according to the desulfurization of prior artThe desulfurization dephosphorization agent that phosphorus agent mixes is compared, and adopts desulfurization dephosphorization agent provided by the invention, can be remarkableSimultaneously desulfurization of raising and the effect of dephosphorization.
In addition, embodiment 1 can be found out compared with embodiment 4-7, by desulfurization dephosphorization agent of the present inventionIn the content of each component be controlled in the preferred scope of the present invention, add in addition calcium carbonate in desulfurization dephosphorization agentOr the granularity of desulfurization dephosphorization agent is controlled at and in the preferred scope of the present invention, all can improves desulfurization simultaneouslyThe effect of dephosphorization.
More than describe the preferred embodiment of the present invention in detail, still, the present invention is not limited to above-mentioned realityExecute the detail in mode, within the scope of technical conceive of the present invention, can be to technical side of the present inventionCase is carried out multiple simple variant, and these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technology spy described in above-mentioned detailed description of the inventionLevy, in reconcilable situation, can combine by any suitable mode. For fear of needn'tThe repetition of wanting, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as itsWithout prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (9)
1. a desulfurization dephosphorization agent, is characterized in that, this desulfurization dephosphorization agent is by lime, sodium carbonate and bluntChange magnesium composition; With respect to the lime of 100 weight portions, the content of described sodium carbonate is 10-30 weight portion,The content of described passivated magnesium is 15-40 weight portion;
Or this desulfurization dephosphorization agent is made up of lime, sodium carbonate, passivated magnesium and calcium carbonate; With respect to 100The lime of weight portion, the content of described sodium carbonate is 10-30 weight portion, the content of described passivated magnesium is15-40 weight portion, the content of described calcium carbonate is 2.5-3.5 weight portion.
2. desulfurization dephosphorization agent according to claim 1, wherein, with respect to the stone of 100 weight portionsAsh, the content of described sodium carbonate is 14.5-22 weight portion, the content of described passivated magnesium is 20-35 weightPart.
3. desulfurization dephosphorization agent according to claim 1 and 2, wherein, in described lime, CaOContent >=89 % by weight; In described passivated magnesium, MgO content >=96 % by weight.
4. desulfurization dephosphorization agent according to claim 1 and 2, wherein, described desulfurization dephosphorization agentGrain graininess is not more than 1mm, and the grain graininess of the described desulfurization dephosphorization agent of at least 85 % by weight is not littleIn 0.1mm.
5. a half steel method for desulfurization dephosphorization simultaneously, the method comprises: in the half steel of molten conditionAdd desulfurization dephosphorization agent to carry out desulfurization dephosphorization, it is characterized in that, described desulfurization dephosphorization agent is claim 1-4Desulfurization dephosphorization agent described in middle any one.
6. method according to claim 5, wherein, with respect to half steel per ton, described desulfurization is de-The addition of phosphorus agent is 5-10kg.
7. method according to claim 6, wherein, with respect to half steel per ton, described desulfurization is de-The addition of phosphorus agent is 5-8kg.
8. according to the method described in any one in claim 5-7, wherein, described half steel contains 1-5The carbon of % by weight, the silicon of 0.01-0.025 % by weight, the manganese of 0.01-0.025 % by weight, 0.01-0.025 % by weightVanadium, 0.01-0.025 % by weight titanium, 0.05-0.1 % by weight phosphorus, 0.05-0.12 % by weight sulphur andThe iron of 94.7-98.8 % by weight.
9. method according to claim 8, wherein, the condition of described desulfurization dephosphorization comprises: halfThe initial temperature of steel is 1315-1380 DEG C, and the processing time is 15-40 minute.
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| JP5605337B2 (en) * | 2010-09-15 | 2014-10-15 | 新日鐵住金株式会社 | Hot metal desulfurization agent and desulfurization method |
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