CN101857911B - Method for steelmaking by using converter - Google Patents

Method for steelmaking by using converter Download PDF

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Publication number
CN101857911B
CN101857911B CN2010102322815A CN201010232281A CN101857911B CN 101857911 B CN101857911 B CN 101857911B CN 2010102322815 A CN2010102322815 A CN 2010102322815A CN 201010232281 A CN201010232281 A CN 201010232281A CN 101857911 B CN101857911 B CN 101857911B
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China
Prior art keywords
converter
iron
steelmaking
steel
molten
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CN2010102322815A
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Chinese (zh)
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CN101857911A (en
Inventor
江善明
王皎月
谢华强
苏继新
李元廷
邱达全
张华�
Original Assignee
四川省达州钢铁集团有限责任公司
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Priority to CN2010102322815A priority Critical patent/CN101857911B/en
Publication of CN101857911A publication Critical patent/CN101857911A/en
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Publication of CN101857911B publication Critical patent/CN101857911B/en

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Abstract

The invention discloses a method for steelmaking by using a converter, which comprises the following steps: adding return ores into the converter and adding molten iron; inserting an air spray gun into a converter for air blowing; adding slag making materials, stopping blowing air when the temperature and ingredients of the molten steel meet requirements; and making molten steel in the converter flow into the steel ladle, and adding a deoxidizer into the steel ladle. The return ores are sintered ores accumulated under a blast furnace bin and are far cheaper than waste steel; and because the return ores contain only a small amount of impurities including slit, rust and the like and mainly contain about 30 percent of iron and 50 percent of iron, the return ores can increase the ferric oxide content of slag in the later stage of blowing, thereby facilitating slagging and functioning as a fusing assistant. In addition, in the blowing process, the iron in the ores is reduced, so the consumption of oxygen and the iron material is reduced. Therefore, the method for steelmaking by using the converter can improve the steelmaking quality and reduce production cost.

Description

A kind of method of converter steelmaking
Technical field
The present invention relates to field of smelting, in particular, relate to the method for converter steelmaking.
Background technology
Converter steelmaking is to be main raw material with molten iron, steel scrap, iron alloy, not by external energy, leans between physics heat and the iron fluid component of iron liquid itself chemical reaction generation heat and in converter, accomplishes steelmaking process.
Can recognize that from heat calculation the converter steelmaking heat is to exist to have more than needed,, need to add certain refrigerant in order to satisfy the requirement of blowing.Generally, adopt the refrigerant of steel scrap as converter steelmaking, steel scrap comprises two kinds, medium and heavy steel scrap and light and thin type steel scrap.Because the medium and heavy scrap ratio of buying is difficulty, so most light and thin type steel scrap that adopts.
But, adopt the light and thin type steel scrap to have a lot of shortcomings as refrigerant.At first, it is more to contain impurity such as silt and iron rust in the light and thin type steel scrap, and impurity has wherein not only increased the difficulty of smelting, but also can reduce the quality of steel; Secondly, the price of light and thin type steel scrap is higher, does not have economy.
So the present inventor finds: in utilizing the process of converter steelmaking, how to improve steelmaking quality, reduce cost, become the problem that needs most solution at present.
Summary of the invention
In view of this, the invention provides a kind of method of the converter steelmaking that improves steelmaking quality and can reduce cost.
The embodiment of the invention is achieved in that
A kind of method of converter steelmaking comprises:
A, will return mine joins in the said converter, and is blended into molten iron;
B, gas spray gun inserted in the converter blow;
C, adding slag making materials;
D,, the temperature of molten steel and composition stop to blow when reaching requirement;
E, the molten steel in the converter is flowed in the ladle, and in ladle, add reductor.
Preferably, in the method for above-mentioned converter steelmaking, in steps d, specifically comprise: when the carbon content of said molten steel reaches required value, stop the operation of oxygen supply immediately.
Preferably, in the method for above-mentioned converter steelmaking, in step a, specifically comprise: said returning mine joined in the said converter by high hopper.
Preferably, in the method for above-mentioned converter steelmaking, said slag making materials is lime, magnesium ball, rhombspar, returns mine.
Preferably, in the method for above-mentioned converter steelmaking, in step b, specifically comprise: gas spray gun is inserted be blown into oxygen and nitrogen in the converter.
Preferably, in the method for above-mentioned converter steelmaking, the top in said converter is blown into oxygen, and the bottom is blown into nitrogen.
Preferably, in the method for above-mentioned converter steelmaking, said reductor is an iron alloy.
Preferably, in the method for above-mentioned converter steelmaking, after step e, also comprise: the foundry goods or the steel ingot that said molten steel are watered into steel.
Compared with prior art, the technical scheme that provides of the embodiment of the invention has the following advantages and characteristics:
The invention provides a kind of method of converter steelmaking, return mine as refrigerant,, reduce the cost of steel-making to improve steelmaking quality through employing.Returning mine is the sintered ore under accumulating under the blast furnace groove, and the relative steel scrap of price is much lower; Because in returning mine, to contain impurity such as silt and iron rust less, its staple comprises about 30% oxygen and 50% full iron, is blowing the middle and later periods; Returning mine to increase the content of red stone in the slag, and being beneficial to slag can play the effect of fusing assistant; And; In converting process, the iron in returning mine is reduced, thereby has reduced the consumption of oxygen and iron and steel stock.Therefore, the method for converter steelmaking provided by the invention can improve steelmaking quality, and can reduce production costs.
Description of drawings
In order to be illustrated more clearly in the present invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the schema of the method for converter steelmaking provided by the present invention.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
The embodiment of the invention provides a kind of can improve steelmaking quality, and the method for the converter steelmaking that can reduce production costs, and this method may further comprise the steps: will return mine joins in the said converter, and is blended into molten iron; Gas spray gun inserted in the converter blow; Add slag making materials; , the temperature of molten steel and composition stop to blow when reaching requirement; Molten steel in the converter is flowed in the ladle, and in ladle, add reductor.Because there is multiple mode in the concrete realization of the method for above-mentioned converter steelmaking, is elaborated through specific embodiment below:
See also shown in Figure 1ly, a kind of method of converter steelmaking may further comprise the steps:
Step 11, will return mine joins in the said converter, and is blended into molten iron;
Step 12, gas spray gun inserted in the converter blow;
Step 13, adding slag making materials;
Step 14,, the temperature of molten steel and composition stop to blow when reaching requirement;
Step 15, the molten steel in the converter is flowed in the ladle, and in ladle, add reductor.
In the embodiment shown in fig. 1; Play the effect of refrigerant in order better to make to return mine; Need prejudge the content of sulphur in content and the molten iron of silicon in the temperature, molten iron of molten iron,, then in the molten iron forward direction converter of packing into, add returning mine of 6-12Kg/t if the content of molten iron temperature height and silicon is high; If molten iron temperature is low, the content of the content height of sulphur or silicon is low, then in the molten iron forward direction converter of packing into, add returning mine of 0-6Kg/t.According to condition of different add different amounts return mine former because: when the content of the temperature height of molten iron or silicon high; Then heat up comparatively fast in blowing molten bath in early stage, because of not adding steel scrap, under equal conditions; Need to add returning mine of equity and control bath temperature, in order to operation; The same molten iron temperature content low or silicon of working as is low, is the convenient purification slag, then need reduce the consumption of returning mine, and guarantees evenly to heat up; When molten iron sulfur-bearing height, the slag making materials that then need add, some more like lime, for guaranteeing even intensification, prevent splash, then need reduce the consumption of returning mine.
In the prior art, usually need to add a large amount of steel scraps, can cause delaying the reaction between carbon and oxygen phase like this, a large amount of iron is evaporated to tobacco in the high-temperature zone or red stone gets in the slag, and the red stone that gathers is prone to cause splash, impels to consume higher and calorific loss.So; In embodiment provided by the invention; In the early stage of steel-making, the splash that causes in order to reduce the molten bath cooling suddenly that returning mine early stage heat absorption causes inserts gas spray gun and is blown into big flow oxygen (upper limit of established technology prescribed value) in the converter; Improving the temperature in early stage, and reduce the content of red stone in the slag.
In the mid-term of blowing, take low oxygen pressure operation (lower limit of established technology prescribed value), according to situation about heating up in the converter, add returning mine of 20-30Kg/t gradually in batches.Forbid in 3 minutes adding returning mine in the stokehold in the first time; Catch carbon operation greater than 1 minute is arranged before the tapping, thereby red stone is restored from slag in a large number, to improve metal recovery rate; When the carbon content of said molten steel reaches required value, stop the operation of oxygen supply immediately.
In the prior art, adopt steel scrap to need special-purpose place and, in converter, add the time that steel scrap takies with overhead traveling crane and be approximately 2-3 minute like specific equipments such as overhead traveling cranes as refrigerant; Under the situation that a plurality of converters are worked simultaneously; Influencing each other between the overhead traveling crane is bigger, thus adopt steel scrap not only to have the defective of having mentioned as refrigerant, but also wasting space; Lose time, improve transportation cost.Given this, the present invention adopts the return mine time that can avoid waste and space, usually; To return mine earlier packs into makes steel the Lower Hold of feeding system; Be transported to high hopper through belt, to scale hooper, open push-pull valve and send into and gather funnel through vibrating feed; In elephant trunk added stove, being about to return mine was joined in the said converter by high hopper again.In whole process, feed, weighing and reinforced all controlled by operator at the master control room of converter.Therefore, adopt and return mine as refrigerant, not only easy to operate, and practiced thrift the space, and do not take the PT, shortened technical process.
Because the top of the present invention in converter is blown into oxygen, the bottom is blown into nitrogen, so mixing effect is good; Composition and temperature in the molten bath are even; Oxygen in the molten steel and the iron oxide concentration in the slag significantly reduce, and reaction has the trend that reduces oxygen level near balance; And the free oxygen corresponding with carbon is far below top blast, and splash trend weakens significantly; The return mine trend of oxygenation plays fusing assistant, can either cool off the molten bath after being heated reduction, can reduce the consumption of metal charge and oxygen again.
In the embodiment shown in fig. 1, after step 15 finishes, promptly after molten steel is qualified, can water into the foundry goods or the steel ingot of steel, steel ingot can be rolled into various steel again.
In sum, the invention provides a kind of method of converter steelmaking, this method is returned mine as refrigerant through employing, to improve steelmaking quality, reduces the cost of steel-making.Returning mine is the sintered ore under accumulating under the blast furnace groove, and the relative steel scrap of price is much lower; Because in returning mine, to contain impurity such as silt and iron rust less, its staple comprises about 30% oxygen and 50% full iron, is blowing the middle and later periods; Returning mine to increase the content of red stone in the slag, and being beneficial to slag can play the effect of fusing assistant; And; In converting process, the iron in returning mine is reduced, thereby has reduced the consumption of oxygen and iron and steel stock.Therefore, the method for converter steelmaking provided by the invention can improve steelmaking quality, and can reduce production costs.
Need to prove that embodiment shown in Figure 1 is the preferred embodiment that the present invention introduces, those skilled in the art on this basis; Can design more embodiment fully, for example, in steelmaking process; Slag making materials is lime, magnesium ball, rhombspar or returns mine that reductor is an iron alloy, and the material that embodiment provided by the invention adopted is not limited thereto; As long as meet the material of the principle of the invention, all can use, therefore do not give unnecessary details herein.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.

Claims (7)

1. the method for a converter steelmaking is characterized in that, comprising:
A, will return mine joins in the said converter, and is blended into molten iron;
Said step a is specially: if the content of said molten iron temperature height and silicon is high, then in the said converter of molten iron forward direction of packing into, add returning mine of 6-12Kg/t; If molten iron temperature is low, the content of the content height of sulphur or silicon is low, then in the molten iron forward direction converter of packing into, add returning mine below the 6Kg/t; Wherein, said composition of returning mine comprises 30% oxygen and 50% full iron;
B, gas spray gun inserted in the converter blow;
C, adding slag making materials, said slag making materials is lime, magnesium ball, rhombspar, returns mine;
D,, the temperature of molten steel and composition stop to blow when reaching requirement;
E, the molten steel in the converter is flowed in the ladle, and in ladle, add reductor.
2. the method for converter steelmaking according to claim 1 is characterized in that, in steps d, specifically comprises: when the carbon content of said molten steel reaches required value, stop the operation of oxygen supply immediately.
3. the method for converter steelmaking according to claim 1 is characterized in that, in step a, specifically comprises: said returning mine joined in the said converter by high hopper.
4. the method for converter steelmaking according to claim 1 is characterized in that, in step b, specifically comprises: gas spray gun is inserted be blown into oxygen and nitrogen in the converter.
5. the method for converter steelmaking according to claim 4 is characterized in that, the top in said converter is blown into oxygen, and the bottom is blown into nitrogen.
6. the method for converter steelmaking according to claim 1 is characterized in that, said reductor is an iron alloy.
7. the method for converter steelmaking according to claim 1 is characterized in that, after step e, also comprises: the foundry goods or the steel ingot that said molten steel are watered into steel.
CN2010102322815A 2010-07-16 2010-07-16 Method for steelmaking by using converter CN101857911B (en)

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CN102787201A (en) * 2012-08-31 2012-11-21 首钢京唐钢铁联合有限责任公司 Application of coal serving as steelmaking slag pressing agent and method for inhibiting steel slag bubbles
CN103614506B (en) * 2013-12-01 2015-12-02 武钢集团昆明钢铁股份有限公司 A kind of converter steel making method using little grade high basicity sinter
CN104294001A (en) * 2014-09-19 2015-01-21 中山市鸿程科研技术服务有限公司 Converter steelmaking method
CN106319130B (en) * 2015-06-16 2018-04-03 鞍钢股份有限公司 A kind of application method of steel-making cooling agent
CN107794330A (en) * 2016-09-06 2018-03-13 鞍钢股份有限公司 A kind of smelting process that steel scrap is substituted with fuel factors such as sintering deposits
CN108277317B (en) * 2017-01-05 2019-12-13 鞍钢股份有限公司 method for improving yield of sinter by converter smelting
CN109897940A (en) * 2019-04-28 2019-06-18 阳春新钢铁有限责任公司 A kind of utilization is returned mine the method for dusting slag
CN110438288A (en) * 2019-09-05 2019-11-12 攀钢集团攀枝花钢铁研究院有限公司 Vanadium-raising cooling agent and its application method

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CN100532579C (en) * 2007-04-30 2009-08-26 郑州永通特钢有限公司 Method for smelting base material of low phosphorous stainless steel by using low-grade limonite containing nickel-chromium
CN100532618C (en) * 2007-08-15 2009-08-26 河南朝阳钢铁有限公司 Nichrome steel alloy for smelting stainless steel and producing method thereof
CN101445845B (en) * 2008-12-19 2011-01-26 陈法官 Process for directly producing austenitic stainless steel by utilizing oxide nickel
CN101519720B (en) * 2009-04-17 2012-01-04 攀钢集团研究院有限公司 Method for preparing high titania type high MgO sintering ore

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