CN103540703A - Method for simultaneously dephosphorizing and extracting vanadium through converter - Google Patents
Method for simultaneously dephosphorizing and extracting vanadium through converter Download PDFInfo
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- CN103540703A CN103540703A CN201210239175.9A CN201210239175A CN103540703A CN 103540703 A CN103540703 A CN 103540703A CN 201210239175 A CN201210239175 A CN 201210239175A CN 103540703 A CN103540703 A CN 103540703A
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Abstract
The invention discloses a method for simultaneously dephosphorizing and extracting vanadium through a converter. The method comprises the step of adding vanadium-containing molten iron into the converter to carry out converter vanadium extraction. The method is characterized in that a dephosphorizing agent is added in the vanadium-containing molten iron in the converter vanadium extraction process, and the heating speed of the vanadium-containing molten iron is controlled at 10-20 DEG C/min in the converter vanadium extraction process, wherein the dephosphorizing agent is lime. The method for simultaneously dephosphorizing and extracting vanadium through the converter, disclosed by the invention, is high in vanadium extraction efficiency and dephosphorizing efficiency, simple in operation and friendly to the environment and can be widely applied to industrial production.
Description
Technical field
The present invention relates to vanadium extraction by converter blowing field, particularly, relate to the method for a kind of converter Dephosphorization vanadium extraction.
Background technology
Phosphorus is the harmful element in most steel grades.In recent years, along with developing rapidly of science and technology, Cryogenic Steel, marine steel, anti-hydrogen induced cracking steel and part slab steel, should have extremely low sulphur content, also requires P content < 0.01 % by weight or P content < 0.005 % by weight in steel.
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.Hot metal ladle or fish torpedo ladle dephosphorization mainly contain that temperature drop is large, splash especially severe again during oxygen blast compensation temperature drop, and the molten iron treatment time is long affects the problems such as production direct motion, and applicable cases is undesirable.And the pre-dephosphorization of converter has been realized commercial scale production in the iron and steel enterprise of Japan and Korea S, Chinese Baosteel adopts converter duplex dephosphorized technology when low phosphorus steel by smelting; Wuhan Iron and Steel Plant has been developed the multinomial innovative technologies such as combined blown converter high efficiency dephosphorating, RH deep dephosphorization and the pre-direct steel of converter, has possessed the ability of producing P content≤0.015 % by weight or P content≤0.01 % by weight steel grade in enormous quantities.
The Panxi Diqu that adopts v-bearing titanomagnetite smelting, contains a large amount of vanadium resources in molten iron, be generally now to adopt converter pyrogenic process process for extracting vanadium, and v element is entered into slag by oxidation, i.e. thick vanadium slag.By hydrometallurgy, v element is being carried out to separation with other composition, obtaining various vanadium goods.Byproduct-half steel after vanadium extraction is being made steel by common steel-making converter, adopts semi-steel making to compare with common molten iron-steelmaking, and molten iron slag is more difficult, and dephosphorization effect is not remarkable.
Consider that vanadium extraction by converter blowing is the oxygen blast operation to molten iron equally, therefore, adopt a kind of technique, make the part dephosphorization task of steel-making converter move forward to converter extracting vanadium, realize the low-cost converter steelmaking of half steel, reach composition, molten steel that temperature is qualified.
CN101302578A discloses a kind of while vanadium extraction and dephosphorization agent, by this while vanadium extraction and dephosphorization agent, can reach the object of vanadium extraction and dephosphorization simultaneously by single stepping.But this kind be vanadium extraction and dephosphorization agent complicated component simultaneously, bad preparation in actually operating, and vanadium extraction rate is lower.
Summary of the invention
To the object of the invention is the problem such as above-mentioned vanadium extraction rate is low, the bad preparation of complicated component in order overcoming, the method for a kind of converter Dephosphorization vanadium extraction to be provided, the method vanadium extraction rate is high, and dephosphorization rate is high, simple to operate.
The present inventor surprisingly finds under study for action, vanadium-bearing hot metal is joined and in converter, carries out vanadium extraction by converter blowing, in vanadium extraction by converter blowing process, to entering in stove vanadium-bearing hot metal to add dephosphorizing agent, dephosphorizing agent adopts lime, and the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is 10-20 ℃/min, can improve dephosphorization rate, and vanadium extraction rate is high, simple to operate.Under preferable case, adopt the pig iron as refrigerant, not only can control well molten iron heat-up rate, and can, when guaranteeing dephosphorization, improve the extraction yield of vanadium.
Therefore, to achieve these goals, the invention provides the method for a kind of converter Dephosphorization vanadium extraction, the method comprises vanadium-bearing hot metal is joined and in converter, carries out vanadium extraction by converter blowing, it is characterized in that, in vanadium extraction by converter blowing process, to entering in stove vanadium-bearing hot metal to add dephosphorizing agent, described dephosphorizing agent is lime, and the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is 10-20 ℃/min.
Preferably, in described lime, CaO content >=85 % by weight, scaling loss amount≤15 % by weight.
Preferably, the add-on of described lime is 10-14.5kg/t vanadium-bearing hot metal.
Preferably, the condition of described vanadium extraction by converter blowing comprises: by oxygen rifle, to being blown into oxygen in converter, blow, oxygen blast total amount is 7-14 standard cubic meter/t vanadium-bearing hot metal, and duration of blast is 4-7min.
Preferably, the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is that the method for 10-20 ℃/min is for to entering, to add refrigerant, described refrigerant in stove vanadium-bearing hot metal be the pig iron.
Preferably, the C that the described pig iron contains 4.2-4.7 % by weight, the Si of 0.05-1.0 % by weight, the Mn of 0.2-0.5 % by weight, the V of 0.2-0.4 % by weight, the P of the Ti of 0.1-0.2 % by weight, 0.03-0.05 % by weight, surplus is Fe.
Preferably, the add-on of the described pig iron is 32-55kg/t vanadium-bearing hot metal.
The method of converter Dephosphorization of the present invention vanadium extraction, vanadium extraction rate is high, is 95% left and right; Dephosphorization rate is high, can reach 60%.In addition, method of the present invention is simple to operate, environmental friendliness, can be widely used in industrial production.
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 the method for a kind of converter Dephosphorization vanadium extraction, the method comprises vanadium-bearing hot metal is joined and in converter, carries out vanadium extraction by converter blowing, in vanadium extraction by converter blowing process, to entering in stove vanadium-bearing hot metal to add dephosphorizing agent, described dephosphorizing agent is lime, and the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is 10-20 ℃/min.
In the present invention, preferably, in described lime, CaO content >=85 % by weight, scaling loss amount≤15 % by weight.
According to the present invention, although vanadium-bearing hot metal is joined and carries out vanadium extraction by converter blowing in converter, in vanadium extraction by converter blowing process, to entering in stove vanadium-bearing hot metal to add dephosphorizing agent, described dephosphorizing agent is lime, and the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is 10-20 ℃/min, can realize object of the present invention, be that vanadium extraction rate is high, dephosphorization rate is high, simple to operate.But under preferable case, the add-on of lime is 10-14.5kg/t vanadium-bearing hot metal, can further improve dephosphorization rate.
In the present invention, in order to play better de-phosphine effect, the granularity of lime is 30-50mm.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.
In the present invention, the condition of vanadium extraction by converter blowing generally includes: by oxygen rifle, to being blown into oxygen in converter, blow, oxygen blast total amount is 7-14 standard cubic meter/t vanadium-bearing hot metal, and duration of blast is 4-7min.
In converter, be blown in the process of oxygen, the flow of oxygen can adopt and well known to a person skilled in the art parameter.Preferred 10000-20000 standard cubic meter (Nm
3)/hour.In described preferred mode, control the flow of oxygen and can more accurately control half composition of steel and temperature.
In the present invention, lime preferably adds after vanadium-bearing hot metal enters stove to the time of the 1min that blows, thereby can further improve dephosphorization rate.
In the present invention, the method that the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is 10-20 ℃/min can adopt the thinkable the whole bag of tricks of those skilled in the art, as long as make the heat-up rate of vanadium-bearing hot metal in vanadium extraction by converter blowing process, is 10-20 ℃/min.General employing adds the method for refrigerant to control the heat-up rate of vanadium-bearing hot metal in vanadium extraction by converter blowing process.
The present inventor surprisingly finds under study for action, when adopting the pig iron to be refrigerant, when adding lime dephosphorization, can further improve vanadium extraction rate.Therefore, refrigerant is preferably the pig iron.Preferably, the C that the pig iron contains 4.2-4.7 % by weight, the Si of 0.05-1.0 % by weight, the Mn of 0.2-0.5 % by weight, the V of 0.2-0.4 % by weight, the P of the Ti of 0.1-0.2 % by weight, 0.03-0.05 % by weight, surplus is Fe.
According to the present invention, although the heat-up rate that adds the pig iron can control vanadium-bearing hot metal in vanadium extraction by converter blowing process is 10-20 ℃/min, under preferable case, the add-on of the pig iron is 32-55kg/t vanadium-bearing hot metal, can further improve vanadium extraction rate.
In the present invention, for the pig iron add opportunity without particular requirement, can adopt the mode of this area routine to add, for example can add in 1-5min in blowing.
It is of the present invention that to enter stove vanadium-bearing hot metal can be the vanadium-bearing hot metal of this area routine, for example enter the C that stove vanadium-bearing hot metal can contain 4.2-4.7 % by weight, the Si of 0.15-1.0 % by weight, the Mn of 0.2-0.5 % by weight, the P of 0.05-0.1 % by weight, the V of 0.2-0.4 % by weight, the Ti of 0.2-0.25 % by weight, surplus is Fe.
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 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.
Embodiment
The present invention is further illustrated for following embodiment, but therefore do not limit the present invention.
In the following Examples and Comparative Examples:
Dephosphorization rate=(the P content in (the P content in the P content-half steel in vanadium-bearing hot metal)/vanadium-bearing hot metal) * 100%
Vanadium extraction rate=(the V content in (the V content in the V content-half steel in vanadium-bearing hot metal)/vanadium-bearing hot metal) * 100%
Embodiment 1
The present embodiment is for illustrating the method for converter Dephosphorization provided by the invention vanadium extraction.
120 tons of converter extracting vanadiums, iron ladle packs 140t vanadium-bearing hot metal into, enter C, the Mn of 0.3 % by weight that stove vanadium-bearing hot metal contains 4.5 % by weight, the Si of the P of 0.09 % by weight, 0.16 % by weight, the Ti of the V of 0.3 % by weight, 0.2 % by weight, all the other compositions are Fe.The temperature that enters stove vanadium-bearing hot metal is 1300 ℃.By oxygen rifle, to being blown into oxygen in converter, blow, oxygen blast total amount is 11.43 standard cubic meter/t vanadium-bearing hot metal, and duration of blast is 6min, (flow of oxygen is 16000 standard cubes m/h).When blowing 0.5min, add lime (CaO content is 92 % by weight, and scaling loss amount is 8 % by weight, and granularity is 40mm), add-on is 12.5kg/t vanadium-bearing hot metal.When blowing 1min, add the pig iron (Ti of the V of the Si of the P of the Mn of the C that contains 4.52 % by weight, 0.28 % by weight, 0.05 % by weight, 0.17 % by weight, 0.28 % by weight, 0.19 % by weight, all the other compositions are Fe), add-on is 45kg/t vanadium-bearing hot metal.In vanadium extraction by converter blowing process, the heat-up rate of vanadium-bearing hot metal is 10-20 ℃/min.Vanadium extraction rate, dephosphorization rate is in Table 1.
Embodiment 2
The present embodiment is for illustrating the method for converter Dephosphorization provided by the invention vanadium extraction.
120 tons of converter extracting vanadiums, iron ladle packs 145t vanadium-bearing hot metal into, enter C, the Mn of 0.5 % by weight that stove vanadium-bearing hot metal contains 4.7 % by weight, the Si of the P of 0.1 % by weight, 1.0 % by weight, the Ti of the V of 0.4 % by weight, 0.2 % by weight, all the other compositions are Fe.The temperature that enters stove vanadium-bearing hot metal is 1285 ℃.By oxygen rifle, to being blown into oxygen in converter, blow, oxygen blast total amount is 8.02 standard cubic meter/t vanadium-bearing hot metal, and duration of blast is that the flow of 4.5min(oxygen is 15500 standard cubes m/h).After vanadium-bearing hot metal enters stove, add lime (CaO content is 95 % by weight, and scaling loss amount is 5 % by weight, and granularity is 35mm), add-on is 14kg/t vanadium-bearing hot metal.When blowing 3min, add the pig iron (Ti of the V of the Si of the P of the Mn of the C that contains 4.6 % by weight, 0.4 % by weight, 0.04 % by weight, 0.2 % by weight, 0.3 % by weight, 0.21 % by weight, all the other compositions are Fe), add-on is 32kg/t vanadium-bearing hot metal.In vanadium extraction by converter blowing process, the heat-up rate of vanadium-bearing hot metal is 10-20 ℃/min.Vanadium extraction rate, dephosphorization rate is in Table 1.
Embodiment 3
The present embodiment is for illustrating the method for converter Dephosphorization provided by the invention vanadium extraction.
120 tons of converter extracting vanadiums, iron ladle packs 138t vanadium-bearing hot metal into, enter C, the Mn of 0.21 % by weight that stove vanadium-bearing hot metal contains 4.25 % by weight, the Si of the P of 0.07 % by weight, 0.21 % by weight, the Ti of the V of 0.25 % by weight, 0.25 % by weight, all the other compositions are Fe.The temperature that enters stove vanadium-bearing hot metal is 1350 ℃.By oxygen rifle, to being blown into oxygen in converter, blow, oxygen blast total amount is 13.95 standard cubic meter/t vanadium-bearing hot metal, and duration of blast is that the flow of 7min(oxygen is 16500 standard cubes m/h).When blowing 1min, add lime (CaO content is 90 % by weight, and scaling loss amount is 10 % by weight, and granularity is 48mm), add-on is 10.71kg/t vanadium-bearing hot metal.When blowing 5min, add the pig iron (Ti of the V of the Si of the P of the Mn of the C that contains 4.61 % by weight, 0.25 % by weight, 0.035 % by weight, 0.22 % by weight, 0.32 % by weight, 0.21 % by weight, all the other compositions are Fe), add-on is 55kg/t vanadium-bearing hot metal.In vanadium extraction by converter blowing process, the heat-up rate of vanadium-bearing hot metal is 10-20 ℃/min.Vanadium extraction rate, dephosphorization rate is in Table 1.
Comparative example 1
According to the method for embodiment 1, carry out the vanadium extraction of converter Dephosphorization.Different, do not add lime and the pig iron, when blowing 0.5min, add the disclosed composite vanadium extraction and dephosphorization agent of the CN101302578A (SiO of the TFe of the CaO that contains 12 % by weight, 65 % by weight, 3 % by weight
2, the MgO of 4 % by weight is, the Al of 10 % by weight
2o
3, surplus is impurity), add-on is 30kg/t vanadium-bearing hot metal.Vanadium extraction rate, dephosphorization rate is in Table 1.
Table 1
| Embodiment/comparative example numbering | Vanadium extraction rate (%) | Dephosphorization rate (%) |
| Embodiment 1 | 93.33 | 44.44 |
| Embodiment 2 | 95.5 | 60 |
| Embodiment 3 | 94 | 50 |
| Comparative example 1 | 90 | 35 |
As can be seen from Table 1, adopt the method for converter Dephosphorization of the present invention vanadium extraction, can greatly improve vanadium extraction rate and de-phosphine rate.
The method of converter Dephosphorization of the present invention vanadium extraction, vanadium extraction rate is high; Dephosphorization rate is high; Simple to operate; Environmental friendliness.The inventive method can be widely used in industrial production.
Claims (10)
1. the method for converter Dephosphorization vanadium extraction, the method comprises vanadium-bearing hot metal is joined and in converter, carries out vanadium extraction by converter blowing, it is characterized in that, in vanadium extraction by converter blowing process, to entering in stove vanadium-bearing hot metal to add dephosphorizing agent, described dephosphorizing agent is lime, and the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is 10-20 ℃/min.
2. method according to claim 1, wherein, in described lime, CaO content >=85 % by weight, scaling loss amount≤15 % by weight.
3. method according to claim 2, wherein, the add-on of described lime is 10-14.5kg/t vanadium-bearing hot metal.
4. according to the method described in any one in claim 1-3, wherein, the granularity of described lime is 30-50mm.
5. method according to claim 1, wherein, the condition of described vanadium extraction by converter blowing comprises: by oxygen rifle, to being blown into oxygen in converter, blow, oxygen blast total amount is 7-14 standard cubic meter/t vanadium-bearing hot metal, and duration of blast is 4-7min.
6. method according to claim 5, wherein, described lime adds after vanadium-bearing hot metal enters stove to the time of the 1min that blows.
7. method according to claim 1, wherein, the heat-up rate of controlling vanadium-bearing hot metal in vanadium extraction by converter blowing process is that the method for 10-20 ℃/min is for to entering, to add refrigerant, described refrigerant in stove vanadium-bearing hot metal be the pig iron.
8. method according to claim 7, wherein, the P of the Ti of the V of the Mn of the Si of the C that the described pig iron contains 4.2-4.7 % by weight, 0.05-1.0 % by weight, 0.2-0.5 % by weight, 0.2-0.4 % by weight, 0.1-0.2 % by weight, 0.03-0.05 % by weight, surplus is Fe.
9. method according to claim 8, wherein, the add-on of the described pig iron is 32-55kg/t vanadium-bearing hot metal.
10. according to the method described in claim 1 or 7, wherein, enter C, the Si of 0.15-1.0 % by weight that stove vanadium-bearing hot metal contains 4.2-4.7 % by weight, the P of the Mn of 0.2-0.5 % by weight, 0.05-0.1 % by weight, the Ti of the V of 0.2-0.4 % by weight, 0.2-0.25 % by weight, surplus is Fe.
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Cited By (2)
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| CN105349728A (en) * | 2015-11-26 | 2016-02-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for simultaneously conducting dephosphorization and vanadium extraction on vanadium-contained molten iron through converter |
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| CN102382927A (en) * | 2010-09-03 | 2012-03-21 | 攀钢集团钢铁钒钛股份有限公司 | Molten iron smelting method and vanadium-containing molten iron smelting method |
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| CN105349728A (en) * | 2015-11-26 | 2016-02-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for simultaneously conducting dephosphorization and vanadium extraction on vanadium-contained molten iron through converter |
| CN105349728B (en) * | 2015-11-26 | 2017-12-12 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of vanadium-bearing hot metal converter Dephosphorization vanadium extraction |
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