CN104060048A - Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method - Google Patents
Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method Download PDFInfo
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- CN104060048A CN104060048A CN201310421596.8A CN201310421596A CN104060048A CN 104060048 A CN104060048 A CN 104060048A CN 201310421596 A CN201310421596 A CN 201310421596A CN 104060048 A CN104060048 A CN 104060048A
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Abstract
The invention discloses a desulfurization and dephosphorization agent comprising 100 parts by weight of lime, 5 to 30 parts by weight of a sodium salt and 5 to 20 parts by weight of fluorspar. The invention also discloses a semisteel simultaneous desulphurization and dephosphorization method comprising addition of the desulfurization and dephosphorization agent into semisteel in a molten state for desulphurization and dephosphorization, wherein the added desulfurization and dephosphorization agent is the desulfurization and dephosphorization agent provided by the invention. By the above technical scheme, the processing time of desulphurization and dephosphorization of the semisteel is shortened, the processed semisteel temperature is low, the total amount of raw materials can be saved, and the pollution to the environment can be reduced. In addition, the dephosphorization and desulfurization are simultaneous, so that the need for additional equipment investment is eliminated, and the operation steps and the processing cost can be saved.
Description
Technical field
The present invention relates to a kind of desulfurization dephosphorization agent, and the method for a kind of half steel while desulfurization dephosphorization.
Background technology
Along with the development of Iron And Steel Industry, more and more higher to the specification of quality of steel.And sulphur and phosphorus are topmost detrimental impurity elements in steel, can greatly reduce the performance of steel, therefore, for the demand of low-sulfur, Low-phosphorus Steel, constantly increase.
At present, in advanced Iron And Steel Industry country, particularly Japan, has carried out a large amount of research to hot metal pretreatment technology, and Technology is ripe.The advanced steel mill of China, as Baosteel, Wuhan Iron and Steel Plant etc., also applied Liquid Iron Pretreatment Technology, and its sulfur removal technology is mature on the whole.
Since 1980, for the pre-dephosphorization problem of molten iron, developed various treatment processs, the most representative have two kinds: a kind of is to carry out dephosphorization in containing the hot metal ladle of molten iron or fish torpedo ladle, another kind is in converter, to carry out dephosphorization of molten iron pre-treatment, and these two kinds of methods have all obtained industrial application.The dephosphorizing agent composition of two kinds of methods is all mainly: with respect to the lime of 100 weight parts, ferric oxide is 110 weight parts, and fluorite is 29 weight parts.
But hot metal ladle or fish torpedo ladle dephosphorization mainly contain, and temperature drop is large, splash especially severe again during oxygen blast compensation temperature drop, the molten iron treatment time is long affects production run and easily causes environmental pollution that (in fluorite, fluorine content is higher, environmental pollution is more serious) etc. problem, applicable cases is undesirable.In converter, carry out the pretreated facility investment of dephosphorization of molten iron larger, the treatment time is also longer.
Therefore, need badly a kind of, temperature short to the molten iron treatment time of exploitation by little, environmental pollution is little and cost is low that half steel is carried out to the method for desulfurization and dephosphorization.
Summary of the invention
The object of the invention is in order to overcome in the technology of existing half steel desulfurization and dephosphorization, long, warm by defect large, big for environment pollution and that cost is high to the molten iron treatment time, provide a kind of short in to the molten iron treatment time, warm desulfurization dephosphorization agent little, that environmental pollution is little and cost is low, and use this desulfurization dephosphorization agent to carry out the method for desulfurization dephosphorization simultaneously to half steel.
The present inventor is surprised to find that under study for action, the mixture that contains lime, sodium salt and fluorite is added in the half steel of melting, and the lime with respect to 100 weight parts, the content of described sodium salt is 5-30 weight part, when the content of described fluorite is 5-20 weight part, described mixture not only can play good desulfidation to half steel, can also the phosphorus in half steel be removed effectively, play the effect of desulfurization dephosphorization unexpected time, greatly shortened the time of desulfurization dephosphorization.And use this while desulfurization dephosphorization agent, in treating processes, molten iron temperature is by little, and environmental pollution is little, and processing cost is also lower.
Based on above discovery, the invention provides a kind of desulfurization dephosphorization agent, wherein, this desulfurization dephosphorization agent contains lime, sodium salt and fluorite; With respect to the lime of 100 weight parts, the content of described sodium salt is 5-30 weight part, and the content of described fluorite is 5-20 weight part.
Preferably, described desulfurization dephosphorization agent also contains calcium carbonate; More preferably, with respect to the lime of 100 weight parts, the content of described calcium carbonate is 4-10 weight part.
Preferably, the grain diameter of described desulfurization dephosphorization agent is not more than 1mm, and the grain diameter of the described desulfurization dephosphorization agent of at least 85 % by weight 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 the half steel of molten state, add desulfurization dephosphorization agent to carry out desulfurization dephosphorization, wherein, described desulfurization dephosphorization agent is desulfurization dephosphorization agent described above.
By above-mentioned technical scheme of half steel being carried out desulfurization dephosphorization simultaneously, shorten significantly the treatment time to half steel desulfurization and dephosphorization, and owing to only once feeding intake, reduced temperature by number of times, therefore, temperature will be less, also save total charging capacity.Fluorine content in this desulfurization dephosphorization agent has had decline significantly compared to existing technology, therefore, has reduced the pollution to environment.In addition, owing to carrying out dephosphorization in desulfurization, no longer need extra facility investment, saved operation steps and processing cost.
Other features and advantages of the present invention partly in detail are described the embodiment subsequently.
Embodiment
Below the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein 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 contains lime, sodium salt and fluorite; With respect to the lime of 100 weight parts, the content of described sodium salt is 5-30 weight part, and the content of described fluorite is 5-20 weight part.
The present inventor finds, when why different prior art is for example, to containing the sample of sulfur impurity and foreign matter of phosphor,, half steel carries out while desulfurization dephosphorization, mainly because when independent use sweetening agent or dephosphorizing agent, all can make described sample obtain higher sweetening effectiveness or dephosphorization effect.But when sweetening agent and dephosphorizing agent are mixed when desulfurization dephosphorization is used simultaneously, not only can not reach desulfurization dephosphorization effect when their are used separately, can make on the contrary their original desulfurization or dephosphorization effect greatly reduce.
The present inventor finds by a large amount of research, by lime, sodium salt and fluorite are used in conjunction with within the scope of aforementioned proportion, can make to act synergistically between each material, makes described desulfurization dephosphorization agent have the effect of desulfurization and dephosphorization higher time.And the usage quantity due to fluorite in desulfurization dephosphorization agent of the present invention reduces greatly, has effectively reduced fluorine content, make in the process of desulfurization at the same time and dephosphorization, the pollution of environment has also been obtained effectively reducing.
Preferably, in described desulfurization dephosphorization agent, with respect to the lime of 100 weight parts, the content of described sodium salt is 10-21.5 weight part, and the content of described fluorite is 5-15 weight part.When the content of above each material is controlled in this preferred content range, when 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 fluorite, CaF
2content>=98 % by weight.
In the present invention, the kind of described sodium salt is had no particular limits.Under preferable case, described sodium salt is sodium carbonate.In this preferred situation, in the time of described desulfurization dephosphorization agent, desulfurization dephosphorization effect can be further enhanced.
According to the present invention, although above-mentioned each material is mixed to the effect that can reach comparatively ideal while desulfurization dephosphorization according to ratio of the present invention.But under preferable case, when described desulfurization dephosphorization agent also contains calcium carbonate, can further improve desulfurization dephosphorization rate.
According to the present invention, for the content of calcium carbonate, those skilled in the art can select according to practical condition.Preferably, with respect to the lime of 100 weight parts, the content of described calcium carbonate is 4-10 weight part.
In the present invention, in order to play better desulfurization dephosphorization effect, the grain graininess of described desulfurization dephosphorization agent is 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.For example, the granularity in described dephosphorizing agent refers to its particle size, and when described particle is while being spherical, described granularity 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 state, add desulfurization dephosphorization agent to carry out desulfurization dephosphorization, wherein, described desulfurization dephosphorization agent is desulfurization dephosphorization agent as above.
In the present invention, add-on for described desulfurization dephosphorization agent has no particular limits, for example, when the silicon in half steel (silicon in half steel is preferentially oxidized with respect to phosphorus) content is higher, can suitably improve the add-on of described desulfurization dephosphorization agent, for example, with respect to half steel per ton, can be 10kg, when silicone content in half steel is lower, contrary, for example, with respect to half steel per ton, can be 5kg.Preferably, with respect to half steel per ton, the add-on of described desulfurization dephosphorization agent is 5-8kg.
Described half steel can be the various half steels of this area routine.In order further to improve the desulfurization dephosphorization effect of half steel, half steel described in the present invention is preferably the half steel after vanadium extraction by converter blowing, the silicon of the carbon that described half steel contains 1-5 % by weight, 0.01-0.025 % by weight, the manganese of 0.01-0.025 % by weight, the vanadium of 0.01-0.025 % by weight, the phosphorus of the titanium of 0.01-0.025 % by weight, 0.05-0.1 % by weight, the iron of the sulphur of 0.05-0.12 % by weight and 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, does not repeat them here.
According to the present invention, it can be the various modes that add of this area routine that described desulfurization dephosphorization agent adds the mode in half steel, for example, can add by the mode of half cylinder of steel winding-up.The speed of described winding-up can be parameter well known in the art, and for example, with respect to half steel per ton, the speed of described winding-up can be 40-60kg/min.
According to the present invention, the condition of described desulfurization dephosphorization can be the condition of desulfurization dephosphorization well known in the art, for example, the condition of described desulfurization dephosphorization comprises: the initial temperature of half steel can be 1315-1380 ℃, time can be 15-40 minute, the prolongation desulfurization dephosphorization time that also can be suitable according to actual desulfurization dephosphorization effect.
According to general steel grade requirement, in most of steel grades, requiring sulphur content is 0.01-0.035 % by weight, phosphorus content is 0.01-0.035 % by weight, adopt desulfurization dephosphorization agent of the present invention to carry out while desulfurization dephosphorization to half steel, not only can effectively improve the desulfurization dephosphorization effect of half steel, make sulphur content and phosphorus content in gained half steel effectively be controlled at the requirement to sulphur content and phosphorus content in most of steel grades, and, owing to only need to once feeding intake, can realize the effect of desulfurization dephosphorization simultaneously, reduced the cooling number of times of half steel, therefore, temperature variation is less, also saved charging capacity simultaneously, also simplify in addition operation steps, improved the utilization ratio of equipment, thereby reduced cost.
Below will describe the present invention by embodiment.In following examples and comparative example,
The sulphur of the phosphorus of the titanium of the vanadium of the manganese of the silicon of the carbon that half steel 1 contains 3.98 % by weight, 0.025 % by weight, 0.025 % by weight, 0.025 % by weight, 0.025 % by weight, 0.095 % by weight, 0.11 % by weight and 95.715 iron;
The sulphur of the phosphorus of the titanium of the vanadium of the manganese of the silicon of the carbon that half steel 2 contains 3.8 % by weight, 0.02 % by weight, 0.02 % by weight, 0.02 % by weight, 0.02 % by weight, 0.07 % by weight, 0.07 % by weight and 95.98 iron;
The sulphur of the phosphorus of the titanium of the vanadium of the manganese of the silicon of the carbon that half steel 3 contains 3.2 % by weight, 0.01 % by weight, 0.01 % by weight, 0.01 % by weight, 0.01 % by weight, 0.055 % by weight, 0.055 % by weight and 96.65 iron.
According to the measuring method of the sulphur content in GB11170-1989, carry out the mensuration of sulphur content.
According to the measuring method of the phosphorus content in GB11170-1989, carry out the mensuration of phosphorus content.
Embodiment 1
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel method of desulfurization dephosphorization simultaneously.
Adopting mode that half steel fills with winding-up is in the half steel 1 of 1375 ℃, with the speed of 50kg/min, to be blown into the desulfurization dephosphorization agent of the present invention of 7.5kg/ ton half steel 140 tons of initial temperatures.Described desulfurization dephosphorization agent by the lime (CaO content is 90 % by weight) of 100 weight parts, the sodium carbonate of 15 weight parts, the fluorite (CaF of 10 weight parts
2content is 98.5 % by weight) and the calcium carbonate of 10 weight parts form.And granularity is all not more than 1mm in described desulfurization dephosphorization, and the ratio that is not less than 0.1mm is 85 % by weight.
Under the initial temperature of 1375 ℃, described half steel is carried out to while desulfurization dephosphorization 21 minutes.The temperature that desulfurization dephosphorization finishes rear mensuration gained half steel is 1330 ℃, and temperature drop is 45 ℃, and sulphur content is 0.012 % by weight, and phosphorus content is 0.010 % by weight.
Embodiment 2
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel method of desulfurization dephosphorization simultaneously.
Adopting mode that half steel fills with winding-up is in the half steel 2 of 1350 ℃, with the speed of 40kg/min, to be blown into the desulfurization dephosphorization agent of the present invention of 6.5kg/ ton half steel 140 tons of initial temperatures.Described desulfurization dephosphorization agent by the lime (CaO content is 89 % by weight) of 100 weight parts, the sodium carbonate of 10 weight parts, the fluorite (CaF of 5 weight parts
2content is 99 % by weight) and the calcium carbonate of 6 weight parts form.And granularity is all not more than 1mm in described desulfurization dephosphorization, and the ratio that is not less than 0.1mm is 90 % by weight.
Under the initial temperature of 1350 ℃, described half steel is carried out to while desulfurization dephosphorization 18.2 minutes.The temperature that desulfurization dephosphorization finishes rear mensuration gained half steel is 1310 ℃, and temperature drop is 40 ℃, and sulphur content is 0.010 % by weight, and 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 method of desulfurization dephosphorization simultaneously.
Adopting mode that half steel fills with winding-up is in the half steel 3 of 1315 ℃, with the speed of 60kg/min, to be blown into the desulfurization dephosphorization agent of the present invention of 5.5kg/ ton half steel 140 tons of initial temperatures.Described desulfurization dephosphorization agent by the lime (CaO content is 92 % by weight) of 100 weight parts, the sodium carbonate of 21.5 weight parts, the fluorite (CaF of 15 weight parts
2content is 98.6 % by weight) and the calcium carbonate of 4 weight parts form.And granularity is all not more than 1mm in described desulfurization dephosphorization, and the ratio that is not less than 0.1mm is 92 % by weight.
Under the initial temperature of 1315 ℃, described half steel is carried out to while desulfurization dephosphorization 15.4 minutes.The temperature that desulfurization dephosphorization finishes rear mensuration gained half steel is 1300 ℃, and temperature drop is 15 ℃, and sulphur content is 0.012 % by weight, and phosphorus content is 0.013 % by weight.
Embodiment 4
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel method of desulfurization dephosphorization simultaneously.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, described desulfurization dephosphorization agent is comprised of lime (CaO content is 90 % by weight), the sodium carbonate of 5 weight parts, the calcium carbonate of the fluorite of 20 weight parts and 10 weight parts of 100 weight parts.The temperature that desulfurization dephosphorization finishes rear gained half steel is 1340 ℃, and temperature drop is 35 ℃, and sulphur content is 0.025 % by weight, and phosphorus content is 0.021 % by weight.
Embodiment 5
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel method of desulfurization dephosphorization simultaneously.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, described desulfurization dephosphorization agent is comprised of lime (CaO content is 90 % by weight), the sodium carbonate of 30 weight parts, the calcium carbonate of the fluorite of 5 weight parts and 10 weight parts of 100 weight parts.The temperature that desulfurization dephosphorization finishes rear gained half steel is 1320 ℃, and temperature drop is 55 ℃, and sulphur content is 0.020 % 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 method of desulfurization dephosphorization simultaneously.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, in described desulfurization dephosphorization agent, do not contain calcium carbonate.The temperature that desulfurization dephosphorization finishes rear gained half steel is 1345 ℃, and temperature drop is 30 ℃, and sulphur content is 0.018 % by weight, and phosphorus content is 0.015 % by weight.
Embodiment 7
The present embodiment is for illustrating desulfurization dephosphorization agent provided by the invention and the half steel method of desulfurization dephosphorization simultaneously.
According to the method for embodiment 1, half steel 1 is carried out to while desulfurization dephosphorization, different, the ratio that described desulfurization dephosphorization agent is not more than 1mm and is not less than 0.1mm is 75 % by weight, and the ratio that is greater than 1mm is 10 % by weight, is less than ratio 15 % by weight of 0.1mm.The temperature that desulfurization dephosphorization finishes rear gained half steel is 1335 ℃, and temperature drop is 40 ℃, and sulphur content is 0.020 % by weight, and phosphorus content is 0.020 % by weight.
Comparative example 1
This comparative example is for illustrating the method for the substep desulfurization dephosphorization of prior art.
Adopting mode that half steel fills with winding-up is in the half steel 1 of 1375 ℃, with the speed of 50kg/min, to be blown into the sweetening agent of 7kg/ ton half steel 140 tons of initial temperatures, and described sweetening agent is by the lime (CaO content is 90 % by weight) of 100 weight parts, the fluorite (CaF of 9.1 weight parts
2composition is in 98.5 % by weight) and the magnesium powder (MgO composition is in 95 % by weight) of 12.1 weight parts form, desulfurization 19.6min.
In half steel after desulfurization, with the speed of 50kg/min, be blown into the dephosphorizing agent of 15kg/ ton half steel, described dephosphorizing agent is comprised of lime (CaO content is 90 % by weight), the ferric oxide of 110 weight parts and the fluorite of 29 weight parts of 100 weight parts, dephosphorization 42min.
The temperature that desulfurization dephosphorization finishes rear gained half steel is 1240 ℃, and stagnation temperature is reduced to 135 ℃, and sulphur content is 0.015 % by weight, and phosphorus content is 0.012 % 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 is, described desulfurization dephosphorization agent is formed according to the weight ratio mixture of 1:1 by sweetening agent and the dephosphorizing agent of comparative example 1, the mixed mixture as desulfurization dephosphorization agent by the lime of 100 weight parts, the magnesium powder of the fluorite of 16 weight parts, 8 weight parts and the ferric oxide of 37 weight parts form.The temperature that desulfurization dephosphorization finishes rear gained half steel is 1320 ℃, and temperature drop is 55 ℃, and sulphur 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, when guaranteeing desulfurization dephosphorization effect, the time of effectively having reduced desulfurization and dephosphorization; And owing to only once feeding in raw material, the temperature of half steel water will also obtain significant reduction, in addition, because desulfurization and dephosphorization carry out simultaneously, effectively raise the utilization ratio of equipment, and saved feeding quantity.Processing cost is reduced greatly.
By relatively can finding out of above embodiment 1 and comparative example 2, the desulfurization dephosphorization agent mixing with desulfurization dephosphorization agent according to prior art is compared, and adopts desulfurization dephosphorization agent provided by the invention, can improve significantly the effect of desulfurization simultaneously and dephosphorization.
In addition, embodiment 1 is compared and can be found out with embodiment 4-7, the content of each component in desulfurization dephosphorization agent of the present invention is controlled in the preferred scope of the present invention, in desulfurization dephosphorization agent, adds in addition calcium carbonate or the granularity of desulfurization dephosphorization agent is controlled to the effect that all can improve while desulfurization dephosphorization in the preferred scope of the present invention.
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, within the scope of technical conceive 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 the concrete technical characterictic described in above-mentioned embodiment, in reconcilable situation, can combine 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.
Claims (9)
1. a desulfurization dephosphorization agent, is characterized in that, this desulfurization dephosphorization agent contains lime, sodium salt and fluorite; With respect to the lime of 100 weight parts, the content of described sodium salt is 5-30 weight part, and the content of described fluorite is 5-20 weight part.
2. desulfurization dephosphorization agent according to claim 1, wherein, with respect to the lime of 100 weight parts, the content of described sodium salt is 10-21.5 weight part, the content of described fluorite is 5-15 weight part.
3. desulfurization dephosphorization agent according to claim 1 and 2, wherein, in described lime, CaO content>=89 % by weight; In described fluorite, CaF
2content>=98 % by weight; Described sodium salt is sodium carbonate.
4. desulfurization dephosphorization agent according to claim 1, wherein, described desulfurization dephosphorization agent also contains calcium carbonate; With respect to the lime of 100 weight parts, the content of described calcium carbonate is 4-10 weight part.
5. the desulfurization dephosphorization agent described in any one in 1-4 as requested, wherein, the grain graininess of described desulfurization dephosphorization agent is 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.
6. a half steel method for desulfurization dephosphorization simultaneously, the method comprises: in the half steel of molten state, add desulfurization dephosphorization agent to carry out desulfurization dephosphorization, it is characterized in that, described desulfurization dephosphorization agent is the desulfurization dephosphorization agent described in any one in claim 1-5.
7. method according to claim 6, wherein, with respect to half steel per ton, the add-on of described desulfurization dephosphorization agent is 5-10kg, is preferably 5-8kg.
8. according to the method described in claim 6 or 7, wherein, the carbon that described half steel contains 1-5 % by weight, the silicon of 0.01-0.025 % by weight, the manganese of 0.01-0.025 % by weight, the titanium of the vanadium of 0.01-0.025 % by weight, 0.01-0.025 % by weight, the sulphur of the phosphorus of 0.05-0.1 % by weight, 0.05-0.12 % by weight and the iron of 94.7-98.8 % by weight.
9. method according to claim 8, wherein, the condition of described desulfurization dephosphorization comprises: the initial temperature of half steel is 1315-1380 ℃, the treatment time is 15-40 minute.
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| CN105803157A (en) * | 2016-06-02 | 2016-07-27 | 攀钢集团攀枝花钢钒有限公司 | Desulfurizing agent and preparation method and application thereof |
| CN108165704A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of vanadium extraction half steel extra furnace dephosphorization Dephosphorising flux and its preparation method and application |
| CN108165705A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of method of producing ultra-low phosphoretic steel by molten steel dephosphorising outside furnace |
| CN112593048A (en) * | 2020-12-09 | 2021-04-02 | 攀钢集团西昌钢钒有限公司 | Semisteel desulfurization method |
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| CN105803157A (en) * | 2016-06-02 | 2016-07-27 | 攀钢集团攀枝花钢钒有限公司 | Desulfurizing agent and preparation method and application thereof |
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| CN108165705A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of method of producing ultra-low phosphoretic steel by molten steel dephosphorising outside furnace |
| CN112593048A (en) * | 2020-12-09 | 2021-04-02 | 攀钢集团西昌钢钒有限公司 | Semisteel desulfurization method |
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