CN102864282A - Recarburization method for semi-steel desulfurization - Google Patents
Recarburization method for semi-steel desulfurization Download PDFInfo
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Abstract
The invention provides a recarburization method for the process of semi-steel magnesium desulfurization. The method includes: simultaneously spraying first desulfurizing recarburizer and second desulfurizing recarburizer into semi-steel for desulfurization and recarburization. The desulfurizing recarburizer is mixture of carbon powder and passivated lime according to a mass ratio of 0.2-0.3. The second desulfurizing recarburizer is mixture of carbon powder and passivated magnesium powder according to a mass ratio of 0.1-0.3. Semi-steel recarburization is performed during the process of desulfurization. Therefore, desulfurizing efficiency is stabilized, and the requirement for semi-steel sulfur content in low-sulfur steel smelting can be met; and in addition, the carbon content of the sulfurized semi-steel is increased effectively, and temperature drop of the sulfurized semi-steel is reduced.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, more particularly, relate to a kind of method in half steel desulfurization carburetting.
Background technology
In the ferrous materials, sulphur content directly affects its use properties, and the too high meeting of sulphur content causes the hot workability of steel to degenerate in the steel; Can obviously reduce in addition the welding property of steel, cause hot cracking; The plasticity of steel is also along with the remarkable variation of the increase of sulphur content; In pure iron or the siliconized plate, sulphur content is high, and hysteresis loss increases.So desulfurization becomes one of major objective in the smelting iron and steel, and the molten iron/semisteel desulfurization is considered to alleviate the metallurgy load of blast furnace, converter, and the main method of the economic target that develops skill also becomes the requisite technique means of smelting low-sulfur Clean Steel.
China is vanadium titano-magnetite big country, climbing the enterprises such as steel, Cheng Gang, elder brother's steel, prestige steel all is to adopt vanadium titano-magnetite to smelt, there are some differences in the molten iron that the vanadium titano-magnetite blast-furnace smelting goes out and common molten iron: the furnace temperature level is low, the blast furnace sweetening power is poor, the sulfur content of hot metal of producing does not use the steel mill of vanadium titano-magnetite on average to exceed 0.030～0.040 percentage point than domestic other, low 40～50 ℃ of temperature.At present, climb the enterprise such as steel adopts the half steel after the vanadium extraction to carry out desulfurization in order to solve the low problems such as desulfurization, the desulfurization temperature drop is large, the desulfurization slag attitude is poor that are unfavorable for of vanadium-titanium-iron-water temperature more, but the temperature when being blended into converter after the half steel desulfurization can be lower directly into the temperature of converter than half steel, is unfavorable for follow-up semi-steel making.
Summary of the invention
For the deficiencies in the prior art, one of purpose of the present invention is to solve the one or more problems that exist in the above-mentioned prior art.
The problem that the half steel carbon content is low in order to solve in the present invention, heat source insufficiency and being unfavorable for is made steel provides a kind of method in half steel desulfurization carburetting.
To achieve these goals, the invention provides a kind of method of half steel desulfurization carburetting, the first desulfurization carburelant and the second desulfurization carburelant sprayed into simultaneously carry out desulfurization and carburetting in the half steel, wherein, the first desulfurization carburelant is the mixture of carbonaceous powder and passive lime, and the mass ratio of carbonaceous powder and passive lime is 0.2～0.3; The second desulfurization carburelant is the mixture of carbonaceous powder and deactivating magnesium powder, and the mass ratio of carbonaceous powder and deactivating magnesium powder is 0.1～0.3.
According to an embodiment of the method for half steel desulfurization carburetting of the present invention, described method specifically may further comprise the steps: first to the half steel first desulfurization carburelant of jetting; To half steel jet simultaneously the first desulfurization carburelant and the second desulfurization carburelant, after the second desulfurization carburelant of winding-up reached predetermined amount, the second desulfurization carburelant stopped to jet again; Continuation is to the half steel first desulfurization carburelant of jetting; Finish winding-up, wherein, the passive lime in described the first desulfurization carburelant that control sprays into and the mass ratio of the deactivating magnesium powder in the second desulfurization carburelant are 4: 1～5: 1.
An embodiment according to the method for half steel desulfurization carburetting of the present invention, the first winding-up amount of controlling the first desulfurization carburelant is 5～20% of always winding-up amount of the first desulfurization carburelant, after the end of winding-up stage, the again winding-up amount of controlling the first desulfurization carburelant is 10～20% of always winding-up amount of the first desulfurization carburelant in the time of the first desulfurization carburelant and the second desulfurization carburelant.
An embodiment according to the method for half steel desulfurization carburetting of the present invention by weight percentage, contains 80～90% CaO in the described passive lime.
An embodiment according to the method for half steel desulfurization carburetting of the present invention by weight percentage, contains 85～90% CaO in the described passive lime.
According to an embodiment of the method for half steel desulfurization carburetting of the present invention, the grade of described deactivating magnesium powder is more than 90% and mean particle size＜2mm.
According to an embodiment of the method for half steel desulfurization carburetting of the present invention, in the described deactivating magnesium powder granularity greater than the no more than gross weight of particle of 1.2mm 2% and less than 10% of the no more than gross weight of particle of 0.15mm.
According to an embodiment of the method for half steel desulfurization carburetting of the present invention, by weight percentage, the carbon content of described carbonaceous powder is more than 80%, and described carbonaceous powder is the powder of carbonaceous material, and described carbonaceous material is at least a in pitch coke, the graphite.
An embodiment according to the method for half steel desulfurization carburetting of the present invention, mean particle size＜the 1mm of the carbonaceous powder in described the first desulfurization carburelant, wherein, granularity less than the particle of 0.075mm be no less than gross weight 80% and be no less than 98% of gross weight less than the particle of 0.25mm.
An embodiment according to the method for half steel desulfurization carburetting of the present invention, mean particle size＜the 2mm of the carbonaceous powder in described the second desulfurization carburelant, wherein, granularity greater than the no more than gross weight of particle of 1.2mm 2% and less than 10% of the no more than gross weight of particle of 0.15mm.
The present invention is by carrying out half steel carburetting in sweetening process, it is stable that desulfuration efficiency had been obtained, and can satisfy the low-sulfur steel smelting to the requirement of half steel sulphur content; While can effectively increase the carbon content after the half steel desulfurization, and the temperature drop after the half steel desulfurization is reduced.
Embodiment
Hereinafter, describe the method for half steel desulfurization carburetting of the present invention in detail in connection with specific embodiment.
The first desulfurization carburelant and the second desulfurization carburelant to be sprayed into simultaneously carry out desulfurization and carburetting in the half steel according to the method for half steel desulfurization carburetting of the present invention, wherein, the first desulfurization carburelant is the mixture of carbonaceous powder and passive lime, and the mass ratio of carbonaceous powder and passive lime is 0.2～0.3; The second desulfurization carburelant is the mixture of carbonaceous powder and deactivating magnesium powder, and the mass ratio of carbonaceous powder and deactivating magnesium powder is 0.1～0.3.Wherein, passive lime, deactivating magnesium powder all use as sweetening agent, and the carbonaceous powder uses as carburelant.
Selecting the carbonaceous powder to mix respectively as sweetening agent with passive lime, deactivating magnesium powder, is in the technical again improvement of magnesium composite desulfate, namely in the process of carrying out the processing of magnesium composite desulfate half steel is carried out carburetting and processes.Because the physics oilness of carbonaceous material is better, the too high meeting of the ratio of carbonaceous material causes winding-up process speed wayward, the ratio of carbonaceous material is crossed the low obvious carburetting effect that then do not reach, and the mass ratio of therefore controlling carbonaceous powder and passive lime is 0.2～0.3, the mass ratio of carbonaceous powder and deactivating magnesium powder is 0.1～0.3 to be advisable.And the two kinds of desulfurization carburelants of jetting not only can remove the sulphur in the half steel and reach target value, can partly increase the carbon content in the half steel simultaneously, for follow-up semi-steel making provides preferably condition.
In one exemplary embodiment of the present invention, the method for half steel desulfurization carburetting specifically may further comprise the steps:
At first, to the half steel first desulfurization carburelant of jetting.
Then, continue to half steel jet simultaneously the first desulfurization carburelant and the second desulfurization carburelant, after the second desulfurization carburelant of winding-up reached predetermined amount, the second desulfurization carburelant stopped to jet.
At last, continue to jet the first desulfurization carburelant and stop winding-up of half steel.
In desulfurization in earlier stage, sulphur content is higher in the half steel, and adopt CaO to carry out the advantage that desulfurization has cost this moment, and sweetening effectiveness is also better simultaneously, so the first desulfurization carburelant of jetting in advance; And along with the reduction of half steel sulphur content, the sweetening effectiveness of Mg is better, therefore adopt passive lime and deactivating magnesium powder to carry out simultaneously desulfurization mid-term, namely jet the simultaneously mode of the first desulfurization carburelant and the second desulfurization carburelant, passive lime wherein and deactivating magnesium powder can reach the purpose to the half steel high-efficiency desulfurization, carburelant wherein simultaneously can play effective carburetting effect, and passive lime wherein can also be as the carrier of deactivating magnesium powder; And in the desulfurization later stage, the first desulfurization carburelant of can only jetting is to adjust the desulfurization slag attitude and to save cost.
Because the winding-up amount of wherein deactivating magnesium powder, passive lime sweetening agent is that take off the factor such as rear target sulphur content with half steel weight, half steel sulphur content, half steel closely-related, therefore for different half steels to the first different desulfurization carburelants and the second desulfurization carburelant winding-up amount should be arranged.Particularly, should require to calculate required deactivating magnesium powder, the winding-up amount of passive lime sweetening agent according to the sulphur content of half steel condition and half steel, mainly be to carry out determining of deactivating magnesium powder winding-up amount, just can be according to the winding-up amount of the ratio-dependent passive lime of passive lime and deactivating magnesium powder after the winding-up amount of deactivating magnesium powder is determined, then total winding-up amount of definite the first desulfurization carburelant and the second desulfurization carburelant respectively.After calculating winding-up amount that the winding-up amount of the second desulfurization carburelant in the winding-up process reaches required deactivating magnesium powder also was predetermined amount, the second desulfurization carburelant just stopped to jet.In the present invention, the passive lime in the first desulfurization carburelant of spraying into of control and the mass ratio of the deactivating magnesium powder in the second desulfurization carburelant are 4: 1～5: 1.This mainly is to consider that from the slag attitude of desulfurization slag if this ratio is too small, then the slag attitude will be thinning, is unfavorable for the reduction with iron loss of removing of desulfurization slag; The consumption of passive lime can increase if this ratio is too high, so that the half steel temperature drop strengthens.
Preferably, in one exemplary embodiment of the present invention, the first winding-up amount of the first desulfurization carburelant is 5～20% of always winding-up amount of the first desulfurization carburelant, after the end of winding-up stage, the again winding-up amount of the first desulfurization carburelant is 10～20% of always winding-up amount of the first desulfurization carburelant in the time of the first desulfurization carburelant and the second desulfurization carburelant.
According to the present invention, can use desulphurization spray gun and carry out the winding-up of desulfurization carburelant with nitrogen as carrier.Particularly, when beginning to jet, begin winding-up when desulphurization spray gun is down to half steel liquid level 50～100cm place, before finishing to jet, spray gun to be desulfurization stops winding-up after leaving the half steel liquid level.
In one exemplary embodiment of the present invention, by weight percentage, contain 80～90% CaO in the passive lime, preferably contain 85～90% CaO reaching best sweetening effectiveness, CaO wherein can with molten iron in the S reaction generate CaS.
In one exemplary embodiment of the present invention, the grade of deactivating magnesium powder is more than 90% and mean particle size＜2mm, and density is 0.88～0.98g/cm
3Preferably, in the described deactivating magnesium powder granularity greater than the no more than gross weight of particle of 1.2mm 2% and less than 10% of the no more than gross weight of particle of 0.15mm.Deactivating magnesium powder adopts above-mentioned granularity requirements not only can increase the reaction contact area of deactivating magnesium powder and half steel, and Reaction time shorten can also avoid in the winding-up process powder to the obstruction of pipeline simultaneously.
In one exemplary embodiment of the present invention, by weight percentage, the carbon content of carbonaceous powder is more than 80%.Particularly, the carbonaceous powder is the powder of carbonaceous material, can be ground by carbonaceous material to form.Carbonaceous material can be the high carbon content materials such as pitch coke, graphite.Preferably, the mean particle size＜1mm of the carbonaceous powder in the first desulfurization carburelant, wherein, granularity less than the particle of 0.075mm be no less than gross weight 80% and be no less than 98% of gross weight less than the particle of 0.25mm.Preferably, the mean particle size＜2mm of the carbonaceous powder in the second desulfurization carburelant, wherein, granularity greater than the no more than gross weight of particle of 1.2mm 2% and less than 10% of the no more than gross weight of particle of 0.15mm.It is the reaction contact area that can increase passive lime and half steel equally that deactivating magnesium powder adopts above-mentioned granularity requirements, and Reaction time shorten can also avoid simultaneously in the winding-up process powder to the obstruction of pipeline.
Further describe the present invention below in conjunction with concrete example.Example only is used for explanation the present invention, rather than limits by any way the present invention.
Example 1:
At first with the carbonaceous powder respectively with passive lime, deactivating magnesium powder according to a certain percentage mixed preparing obtains the first desulfurization carburelant and the second desulfurization carburelant, then before desulfurization respectively with the first desulfurization carburelant, the second desulfurization carburelant is encased in the batch can, batch can adopts the drying nitrogen sealing, the spray gun to be desulfurization first desulfurization carburelant that begins when being down to half steel liquid level 50～100cm to jet take nitrogen as carrier, the mode desulfurization of adopting the first desulfurization carburelant and the second desulfurization carburelant to jet simultaneously behind winding-up flow winding-up 0.5～2min with 35～45kg/min, after reaching requirement, the winding-up amount of the second desulfurization carburelant closes the batch can valve of the second desulfurization carburelant, continuation is jetted with the winding-up flow of 35～45kg/min and is promoted spray gun behind the first desulfurization carburelant 0.5～2min, after leaving the half steel liquid level, spray gun stops winding-up, the mass ratio of the deactivating magnesium powder in the passive lime of the first desulfurization carburelant that wherein, sprays into and the second desulfurization carburelant is controlled to be 4: 1～and 5: 1.
Wherein, carbonaceous powder in the first desulfurization carburelant and the mass ratio of passive lime are 0.2, carbonaceous powder in the second desulfurization carburelant and the mass ratio of deactivating magnesium powder are 0.3, and the mass ratio of the passive lime of the first desulfurization carburelant that sprays into and the deactivating magnesium powder of the second desulfurization carburelant is controlled to be 4: 1.After half steel entered the desulfurization station, the sulphur content that detects in the half steel was 0.075%, and wherein the usage quantity of deactivating magnesium powder is 154kg.The sulphur content that detects in the molten iron after desulfurization finishes is 0.005%, and desulfuration efficiency is 93.3%, and the half steel carbon increasing amount is 0.065%, and the carbon recovery rate is 85.1%, and hot metal temperature drop is 21 ℃.
Example 2:
Method steps is identical with example 1.
Wherein, carbonaceous powder in the first desulfurization carburelant and the mass ratio of passive lime are 0.3, carbonaceous powder in the first desulfurization carburelant and the mass ratio of passive lime are 0.1, and the mass ratio of the passive lime of the first desulfurization carburelant that sprays into and the deactivating magnesium powder of the second desulfurization carburelant is controlled to be 5: 1.After half steel entered the desulfurization station, the sulphur content that detects in the half steel was 0.061%, and wherein the usage quantity of deactivating magnesium powder is 140kg.The sulphur content that detects in the molten iron after desulfurization finishes is 0.004%, and desulfuration efficiency is 93.4%, and the half steel carbon increasing amount is 0.11%, and the carbon recovery rate is 85.0%, and hot metal temperature drop is 18 ℃.
Example 3:
Method steps is identical with example 1.
Wherein, carbonaceous powder in the first desulfurization carburelant and the mass ratio of passive lime are 0.25, carbonaceous powder in the first desulfurization carburelant and the mass ratio of passive lime are 0.2, and the mass ratio of the passive lime of the first desulfurization carburelant that sprays into and the deactivating magnesium powder of the second desulfurization carburelant is controlled to be 4.5: 1.After half steel entered the desulfurization station, the sulphur content that detects in the half steel was 0.055%, and wherein the usage quantity of deactivating magnesium powder is 120kg.The sulphur content that detects in the molten iron after desulfurization finishes is 0.005%, and desulfuration efficiency is 90.9%, and the half steel carbon increasing amount is 0.06%, and the carbon recovery rate is 85.5%, and hot metal temperature drop is 19 ℃.
In sum, method of carrying out carburetting in half steel magnesium sweetening process of the present invention can be carried out half steel carburetting in desulfurization, desulfuration efficiency can be stabilized in more than 90%, and the carbon recovery rate of carburelant can reach 85% simultaneously, and the desulfurization temperature drop can reduce 2～5 ℃.Not only satisfied the requirement of steel mill to the low-sulfur half steel, and carbon content in can the Effective Raise half steel, for steel making working procedure provides good raw material.
Although the above has described the present invention in conjunction with exemplary embodiment, those of ordinary skills should be clear, in the situation of the spirit and scope that do not break away from claim, can carry out various modifications to above-described embodiment.
Claims (10)
1. the method for a half steel desulfurization carburetting is characterized in that, the first desulfurization carburelant and the second desulfurization carburelant are sprayed into simultaneously carry out desulfurization and carburetting in the half steel,
Wherein, the first desulfurization carburelant is the mixture of carbonaceous powder and passive lime, and the mass ratio of carbonaceous powder and passive lime is 0.2～0.3;
The second desulfurization carburelant is the mixture of carbonaceous powder and deactivating magnesium powder, and the mass ratio of carbonaceous powder and deactivating magnesium powder is 0.1～0.3.
2. the method for half steel desulfurization carburetting according to claim 1 is characterized in that, described method specifically may further comprise the steps:
First to the half steel first desulfurization carburelant of jetting;
To half steel jet simultaneously the first desulfurization carburelant and the second desulfurization carburelant, after the second desulfurization carburelant of winding-up reached predetermined amount, the second desulfurization carburelant stopped to jet again;
Continuation is to the half steel first desulfurization carburelant of jetting;
Finish winding-up,
Wherein, the passive lime in described the first desulfurization carburelant of spraying into of control and the mass ratio of the deactivating magnesium powder in the second desulfurization carburelant are 4: 1～5: 1.
3. the method for half steel desulfurization carburetting according to claim 2, it is characterized in that, the first winding-up amount of controlling the first desulfurization carburelant is 5～20% of always winding-up amount of the first desulfurization carburelant, after the end of winding-up stage, the again winding-up amount of controlling the first desulfurization carburelant is 10～20% of always winding-up amount of the first desulfurization carburelant in the time of the first desulfurization carburelant and the second desulfurization carburelant.
4. the method for half steel desulfurization carburetting according to claim 1 is characterized in that, by weight percentage, contains 80～90% CaO in the described passive lime.
5. the method for half steel desulfurization carburetting according to claim 4 is characterized in that, by weight percentage, contains 85～90% CaO in the described passive lime.
6. the method for half steel desulfurization carburetting according to claim 1 is characterized in that, the grade of described deactivating magnesium powder is more than 90% and mean particle size＜2mm.
7. the method for half steel desulfurization carburetting according to claim 6 is characterized in that, in the described deactivating magnesium powder granularity greater than the no more than gross weight of particle of 1.2mm 2% and less than 10% of the no more than gross weight of particle of 0.15mm.
8. the method for half steel desulfurization carburetting according to claim 1, it is characterized in that by weight percentage, the carbon content of described carbonaceous powder is more than 80%, described carbonaceous powder is the powder of carbonaceous material, and described carbonaceous material is at least a in pitch coke, the graphite.
9. the method for half steel desulfurization carburetting according to claim 8, it is characterized in that, mean particle size＜the 1mm of the carbonaceous powder in described the first desulfurization carburelant, wherein, granularity less than the particle of 0.075mm be no less than gross weight 80% and be no less than 98% of gross weight less than the particle of 0.25mm.
10. the method for half steel desulfurization carburetting according to claim 8, it is characterized in that, mean particle size＜the 2mm of the carbonaceous powder in described the second desulfurization carburelant, wherein, granularity greater than the no more than gross weight of particle of 1.2mm 2% and less than 10% of the no more than gross weight of particle of 0.15mm.
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| CN105200190A (en) * | 2015-11-05 | 2015-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurization carburant capable of improving quality of by-product molten iron of titanium slag electric furnace and preparation method |
| CN106086300A (en) * | 2016-06-21 | 2016-11-09 | 首钢京唐钢铁联合有限责任公司 | Recarburization treatment method for molten iron |
| CN107893148A (en) * | 2017-12-04 | 2018-04-10 | 河钢股份有限公司承德分公司 | A kind of method of the pre- desulfurization of half steel |
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| CN103757179A (en) * | 2013-12-30 | 2014-04-30 | 攀钢集团西昌钢钒有限公司 | Method for deeply desulfurizing semisteel |
| CN105200190A (en) * | 2015-11-05 | 2015-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurization carburant capable of improving quality of by-product molten iron of titanium slag electric furnace and preparation method |
| CN106086300A (en) * | 2016-06-21 | 2016-11-09 | 首钢京唐钢铁联合有限责任公司 | Recarburization treatment method for molten iron |
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| CN110438294A (en) * | 2019-09-09 | 2019-11-12 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of half steel increase heat source |
| CN110453037A (en) * | 2019-09-09 | 2019-11-15 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of half steel increase heat source |
| CN110468252A (en) * | 2019-09-09 | 2019-11-19 | 攀钢集团攀枝花钢铁研究院有限公司 | The method of half steel increase heat source |
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| CN102864282B (en) | 2014-05-21 |
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