CN101899604B - Direct alloying steelmaking process for manganese oxide composite briquettes used for re-blowing revolving furnace - Google Patents
Direct alloying steelmaking process for manganese oxide composite briquettes used for re-blowing revolving furnace Download PDFInfo
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Abstract
The invention relates to direct alloying steelmaking process for manganese oxide composite briquettes used for a re-blowing revolving furnace. The technical scheme comprises the following steps of: when the carbon content of molten steel in the revolving furnace is reduced to less than 0.1 percent and the molten steel reaches the temperature of between 1,650 and 1,750DEG C, and adding manganese oxide composite briquettes into the revolving furnace at one time, wherein the manganese oxide composite briquettes, which undergo cold pressing and mixed with carbon, are quickly heated to above 1,500 DEG C by the heat of the molten steel in the revolving furnace, the manganese oxide is quickly self-reduced in the manganese oxide composite briquettes which undergo cold pressing and mixed with carbon, so that the aim of the direct alloying of the molten steel is achieved. Oxygen blowing is stopped in the revolving furnace after the manganese oxide composite briquettes are added into the revolving furnace in order to avoid the re-oxidation of manganese, but the uniformization of manganese in the molten steel is enforced by the bottom-blowing strengthening molten pool stirring of the revolving furnace. The process of the invention has the advantages of simple process, easy operation and control, high manganese yield, great energy conservation, low CO2 emission and low production cost of the alloying of the manganese in the molten steel.
Description
Technical field
The invention belongs to the metallic substance production technical field, be specifically related to a kind of manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making.
Background technology
Manganese is one of most important alloying element during ferrous materials is produced, so saying of " no manganese is Cheng Gang not " arranged.General steel-making alloying of manganese technology is in the converter tapping process, including Mn-Fe alloys such as ferromanganese, silicomanganese directly to be added in the ladle.In order to reduce the production cost of molten steel alloying of manganese, carried out a large amount of relevant converter manganese ore direct alloying technique process for making research both at home and abroad.This technology has saved the production process of manganeseirom, thus significantly save energy with reduce CO
2Discharging.
Japan is carrying out a large amount of fundamental researchs and industrial practice aspect the steel-making of converter manganese ore direct alloying technique; Realize converter less-slag blowing (quantity of slag is reduced to about 20kg/t), use rich manganese ore in converter, to carry out melting and reducing, the measures such as (w (C)＞0.1%) of the high catch carbon of converter terminal as reductive agent through molten iron " three take off " (being desiliconization, desulfurization and dephosphorization) with coke; Make the yield of manganese be stabilized in about 70% (KANEKO Toshiyuki; MATSUZAKI Takafumi; KUGIMIYA Teiji et al.Improvement of Mn Yield in Less Slag Blowing at BOF by Use of Sintered Manganese Ore; Tetsu-to-Hagane1993,79 (8): 941-947).Baosteel adopts " three take off " molten iron to carry out few slag (about 30kg/t) blowing; In converter, add manganese ore; Rely on the carbon in the molten steel that manganese ore is carried out melting and reducing; Under the condition of the high catch carbon of converter terminal (w (C)＞0.1%), obtain＞50% manganese yield (Jiang Xiaofang, Chen Zhaoping. the practice of the few slag steel-making of Baosteel, the 12 the academic proceeding of whole nation steel-making. Shenyang: press of Northeastern University, 2002:115).Domestic many steelworkss have carried out the commerical test of converter manganese ore direct alloying technique, but the yield of manganese be merely 5%～23% (Wen Yongcai, Dong Yanhua, Wang Tao etc. adopt manganese ore steel to be carried out DIRECT ALLOYING, steel vanadium titanium, 1998,19 (3): 7～13; Call together the Meng, Yang Xigen, Wang Yuchun. alloying of manganese is inquired into, and Shandong is metallurgical, 2003,25 (supplementary issues): 111～113; Li Rongsheng, Feng Runming, Wei state increase etc. the application of poor manganese ore in converter steelmaking process, steel-making, 2004,20 (1): 13～15; Zhao Zhongfu, Li Xiaoming, Shen Jisheng. converter steelmaking adds the experimental study that manganese ore improves terminal point manganese content, steel-making, 2010,26 (1): 40～43).Cause the low major cause of converter manganese ore direct alloying technique manganese yield to be: (1) molten iron is unrealized " three take off ", and (80～100kg/t), manganese oxide is diluted by bits greatly to cause the converter quantity of slag; (2) fluctuation of converter terminal carbon is big, is difficult to guarantee stable catch carbon practice; (3) no unnecessary high hopper is difficult to realize making reductive agent with adding coke.
In recent years, also there is the metallargist to carry out improving the research work of manganese yield with manganese ore composite pellet DIRECT ALLOYING.Like " a kind of Mn oxide DIRECT ALLOYING process for making " (CN1470667) technology; Proposed Mn oxide is become 50～200 purpose powders with addition of reductive agent, heat-generating agent, catalyzer etc. through crushing grinding; Mixing and become the manganese alloy pelletizing then through binder making; In electric furnace or converter tapping process, the manganese alloy pelletizing is joined in the molten steel in batches, utilize molten steel high temperature that manganese direct melting from Mn oxide is reduced into manganese metal and molten steel is carried out DIRECT ALLOYING.The manganese ore composite pellet that this invention is used is in tapping process, to add in the ladle; The reduction of Mn oxide is carried out under the few quantity of slag, low oxidative top slag and deoxidation of molten steel condition, and is different with the hyperoxia voltinism conditionally complete of endpoint molten steel in the converter and bits.There is top slag crust in this in addition method, causes the risk of the LF refining furnace electrode that fractures.
Flos Bombacis Malabarici iron and steel research institute also used when under laboratory condition, studying manganese ore pelletizing DIRECT ALLOYING kinetics a kind of manganese ore composite pellet (Wen Yongcai, Dong Yanhua, Dodd's letter etc. carry out the dynamics research of steel DIRECT ALLOYING with the manganese ore pelletizing; Steel vanadium titanium; 1998,19 (1): 9～15).This manganese ore composite pellet is with manganese content 47.65% manganese ore and chemical reagent CaO, SiO
2, FeO, CaF
2Mixing is processed basicity (CaO/SiO together
2) be 2～4, FeO content is 6%～12%, and MnO content is 20%～40%, and diameter is the 10mm pelletizing.Also with addition of a certain amount of carbon dust, be 70% of the whole MnO of reduction in the pelletizing with addition of amount.With this manganese ore pelletizing directly as the steel-making slag, molten steel initial carbon content be under the condition of 0.20%～0.78% (the molten steel endpoint carbon content is 0.24%～0.80%) in the research slag factors such as MnO, FeO, basicity, the quantity of slag, liquid steel temperature and carbon content of molten steel to the influence of manganese yield.The employed method of this fundamental research that carry out in the laboratory adds the manganese ore DIRECT ALLOYING with converter does not in fact have essential distinction; That is to say that (MnO content reaches 20%～40% in like slag, is equivalent to the converter less-slag amount and smelts under the controlled supremacy clause in laboratory; The molten steel endpoint carbon content reaches 0.24%～0.80%, is equivalent to the converter catch carbon practice, and the reduction of MnO mainly relies on the carbon in the molten steel in the slag) simulation converter add of the influence of manganese ore DIRECT ALLOYING research technological factor to manganese yield.
Summary of the invention
The present invention is intended to overcome the prior art defective, purpose provide a kind of technology simple, be easy to operate and control, production cost is low, the yield of manganese high, save energy and alleviate CO
2The manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making of discharging.
To achieve these goals; The technical scheme that the present invention adopted is: common process blowing is pressed in converter, when molten steel carbon is reduced to 0.1% below and liquid steel temperature when reaching 1650～1750 ℃, and disposable adding manganese oxide composite briquettes in converter; Stop then to the molten steel oxygen blast; Simultaneously the converter argon bottom-blowing is reached maximum and carry out the molten bath stirring, evenly molten steel composition and temperature are pressed the common process tapping behind converter adding manganese oxide composite briquettes 2～5min.
Described manganese oxide composite briquettes is with addition of coke powder or coal dust by manganese ore or rich manganese slag; Mix the back through joining the carbon agglomerate in the coldmoulding acquisition; Wherein: manganese ore is that manganese content is the poor manganese ore of 20wt%～30wt% or the rich manganese ore that manganese content is 30wt%～50wt%, and the manganese content of rich manganese slag is 40wt%～55wt%; In join the carbon agglomerate interior mixed carbon comtent by in the manganese ore or manganese oxide in the rich manganese slag and red stone carbon amount that all directly reduction consume 1.0～1.4 times with addition of, the particle diameter of the manganese ore in the manganese oxide composite briquettes or rich manganese slag, coke powder or coal dust is below the 0.5mm.
The add-on that adds manganese oxide composite briquettes in the described converter is to require to confirm according to the residual manganese amount of converter terminal target, counts steel per ton by MnO and adds 4～20kg.
Owing to adopt technique scheme; The present invention replaces the direct manganese addition miner skill of converter to carry out the method for combined blown converter DIRECT ALLOYING with joining oxidation of coal manganese composite briquettes in colding pressing; Join oxidation of coal manganese composite briquettes in disposable adding is colded pressing in stove; Utilize and join oxidation of coal manganese composite briquettes in molten steel high temperature will be colded pressing in the converter and be heated rapidly to more than 1500 ℃, in colding pressing, join the inner quick autoreduction of realizing manganese oxide of oxidation of coal manganese composite briquettes, reach the purpose of molten steel being carried out DIRECT ALLOYING.The residual manganese content of converter molten steel through joining the smelting of oxidation of coal manganese composite briquettes DIRECT ALLOYING in colding pressing can reach more than 1.0%; Do not allow again to the molten steel oxygen blast after joining oxidation of coal manganese composite briquettes in the converter adding is colded pressing; To avoid manganese by oxidation again; Stir but rely on the converter bottom blowing to strengthen the molten bath, promote manganese homogenizing in molten steel.The present invention has following advantage:
1) simple to operate, need not in converter, to add again coke and take more high hopper, also need not to adopt few slag steel-making just can realize high manganese yield.Because it is inner to join oxidation of coal manganese composite briquettes in the reduction reaction of manganese oxide occurs in and colds pressing, converter quantity of slag size does not produce obvious influence to the reduction of manganese oxide;
2) flexibility is strong, need not to require converter terminal to carry out catch carbon practice.Because the reduction reaction of manganese oxide is not the carbon that relies in the molten steel, but carry out autoreduction, so converter terminal carbon content, finishing slag FeO content do not produce substantial effect to the reduction of manganese oxide with the carbon of joining oxidation of coal manganese composite briquettes inside in colding pressing;
3) reduction rate is fast, in join oxidation of coal manganese composite briquettes and should add latter stage bessemerizing.Common manganese ore direct alloying technique technology, manganese ore must add in blowing early stage or mid-term, and carbon content is high in the molten steel at this moment, and manganese oxide is by a large amount of reduction in the slag.But along with carbon content of molten steel descends, the manganese in the molten steel is again by oxidation again, and particularly when converter terminal carbon was lower than 0.1%, the yield of manganese was very low.In colding pressing, employing joins oxidation of coal manganese composite briquettes, since manganese oxide and reductive agent carbon uniform mixing, closely contact, the autoreduction reaction diffusional resistance of manganese oxide is little, and reduction reaction takes place in agglomerate inside simultaneously, finishes at 2～5min internal reaction.
Therefore, technology of the present invention is simple, be easy to operate and control, significantly save energy with alleviate CO
2Discharge, and can reduce the production cost of molten steel alloying of manganese significantly, have the high characteristics of yield of manganese.
Embodiment
Below in conjunction with embodiment the present invention being done further description, is not the restriction to protection domain.
The particle diameter of the manganese ore in the manganese oxide composite briquettes in this embodiment or rich manganese slag, coke powder or coal dust is below the 0.5mm.
Embodiment 1
A kind of manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making: the common process blowing is pressed in converter; When carbon content of molten steel is reduced to below 0.1% when reaching 1680～1750 ℃ with liquid steel temperature, from high hopper disposable adding manganese oxide composite briquettes in converter; The quantity that adds manganese oxide composite briquettes in the converter is the requirement that is higher than 0.8wt% according to the residual manganese amount of converter terminal target, counts steel per ton by MnO and adds 15～18kg; Stop then to the molten steel oxygen blast, simultaneously the converter argon bottom-blowing is reached maximum and carry out the molten bath stirring, evenly molten steel composition and temperature behind adding manganese oxide composite briquettes 4～5min, are pressed the common process tapping in converter.
Use in the present embodiment cold pressing in join oxidation of coal manganese composite briquettes and be the coldmoulding behind the coke powder mixing of the rich manganese ore of 30wt%～50wt% by manganese content, in join the carbon agglomerate interior mixed carbon comtent by manganese oxide in the manganese ore and red stone carbon amount that all directly reduction consume 1.2～1.4 times with addition of.
The staple that present embodiment is smelted the converter terminal molten steel that obtains is: w (C)＜0.1wt%; W (Mn)＞0.8wt%; W (O)≤0.02wt%.
Embodiment 2
A kind of manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making: the common process blowing is pressed in converter; When carbon content of molten steel is reduced to below 0.1% when reaching 1680～1750 ℃ with liquid steel temperature, from high hopper disposable adding manganese oxide composite briquettes in converter; The quantity that adds manganese oxide composite briquettes in the converter is the requirement that is higher than 1.0wt% according to the residual manganese amount of converter terminal target, counts steel per ton by MnO and adds 18～20kg; Stop then to the molten steel oxygen blast, simultaneously the converter argon bottom-blowing is reached maximum and carry out the molten bath and stir, evenly molten steel composition and temperature when in converter, adding behind the manganese oxide composite briquettes 4～5min, press common process and are tapped.
Manganese oxide composite briquettes in the present embodiment be by manganese content be 40wt%～55wt% rich manganese slag with addition of coal dust mix the back through coldmoulding obtain in join the carbon agglomerate; In join the carbon agglomerate interior mixed carbon comtent by 1.2～1.4 times of the carbon amount that all directly reduction consume of the manganese oxide in the rich manganese slag with addition of.
The staple that present embodiment is smelted the converter terminal molten steel that obtains is: w (C)＜0.1wt%; W (Mn)＞1.0wt%; W (O)≤0.02wt%.
Embodiment 3
A kind of manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making: the common process blowing is pressed in converter; When molten steel carbon is reduced to below 0.1% when reaching 1650～1700 ℃ with liquid steel temperature, from high hopper disposable adding manganese oxide composite briquettes in converter; The quantity that adds manganese oxide composite briquettes in the converter is the requirement that is lower than 0.8wt% according to the residual manganese amount of converter terminal target, counts steel per ton by MnO and adds 10～15kg; Stop then to the molten steel oxygen blast, simultaneously the converter argon bottom-blowing is reached maximum and carry out the molten bath and stir, evenly molten steel composition and temperature when in converter, adding behind the manganese oxide composite briquettes 2～4min, press common process and are tapped.
Manganese oxide composite briquettes in the present embodiment be by manganese content be 20wt%～30wt% poor manganese ore with addition of coke powder mix the back through coldmoulding obtain in join the carbon agglomerate; In join the carbon agglomerate interior mixed carbon comtent by manganese oxide in the manganese ore and red stone carbon amount that all directly reduction consume 1.2～1.3 times with addition of.
The staple that present embodiment is smelted the converter terminal molten steel that obtains is: w (C)＜0.1wt%; W (Mn) is 0.6～0.8wt%; W (O)≤0.03wt%.
Embodiment 4
A kind of manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making: the common process blowing is pressed in converter; When molten steel carbon is reduced to below 0.1% when reaching 1650～1700 ℃ with liquid steel temperature, from high hopper disposable adding manganese oxide composite briquettes in converter; The add-on of manganese oxide composite briquettes is the requirement that is lower than 0.8wt% according to the residual manganese amount of converter terminal target in the converter, counts steel per ton by MnO and adds 4～10kg; Stop then to the molten steel oxygen blast, simultaneously the converter argon bottom-blowing is reached maximum and carry out the molten bath and stir, evenly molten steel composition and temperature when in converter, adding behind the manganese oxide composite briquettes 2～4min, press common process and are tapped.
Manganese oxide composite briquettes in the present embodiment be by manganese content be 20wt%～30wt% poor manganese ore with addition of coal dust mix the back through coldmoulding obtain in join the carbon agglomerate; In join the carbon agglomerate interior mixed carbon comtent by manganese oxide in the manganese ore and red stone carbon amount that all directly reduction consume 1.0～1.2 times with addition of.
The staple that present embodiment is smelted the converter terminal molten steel that obtains is: w (C)＜0.1wt%; W (Mn) is 0.4～0.6wt%; W (O)≤0.03wt%.
This embodiment replaces the direct manganese addition miner skill of converter to carry out the method for combined blown converter DIRECT ALLOYING with joining oxidation of coal manganese composite briquettes in colding pressing; Join oxidation of coal manganese composite briquettes in disposable adding is colded pressing in stove; Utilize and join oxidation of coal manganese composite briquettes in molten steel high temperature will be colded pressing in the converter and be heated rapidly to more than 1500 ℃; In colding pressing, join the inner quick autoreduction of realizing manganese oxide of oxidation of coal manganese composite briquettes, reach the purpose of molten steel being carried out DIRECT ALLOYING.The residual manganese content of converter molten steel through joining the smelting of oxidation of coal manganese composite briquettes DIRECT ALLOYING in colding pressing can reach more than 1.0%.Converter adds to join in colding pressing and does not allow behind the oxidation of coal manganese composite briquettes, to stir but rely on the converter bottom blowing to strengthen the molten bath to avoid manganese by oxidation again to the molten steel oxygen blast again, promotes manganese homogenizing in molten steel.Therefore, this embodiment has following advantage:
1) simple to operate, need not in converter, to add again coke and take more high hopper; Need not to adopt the steel-making of few slag just can realize high manganese yield yet, join oxidation of coal manganese composite briquettes inside owing to the reduction reaction of manganese oxide occurs in colding pressing, converter quantity of slag size does not produce obvious influence to the reduction of manganese oxide;
2) flexibility is strong, need not to require converter terminal to carry out catch carbon practice.Because the reduction reaction of manganese oxide is not the carbon that relies in the molten steel, but carry out autoreduction, so converter terminal carbon content, finishing slag FeO content do not produce substantial effect to the reduction of manganese oxide with the carbon of joining oxidation of coal manganese composite briquettes inside in colding pressing;
3) reduction rate is fast, in join oxidation of coal manganese composite briquettes and should add latter stage bessemerizing.Common manganese ore direct alloying technique technology, manganese ore must add in blowing early stage or mid-term, and carbon content is high in the molten steel at this moment, and manganese oxide is by a large amount of reduction in the slag.But along with carbon content of molten steel descends, the manganese in the molten steel is again by oxidation again, and particularly when converter terminal carbon was lower than 0.1%, the yield of manganese was very low.In colding pressing, employing joins oxidation of coal manganese composite briquettes, since manganese oxide and reductive agent carbon uniform mixing, closely contact, the autoreduction reaction diffusional resistance of manganese oxide is little, and reduction reaction takes place in agglomerate inside simultaneously, finishes at 2～5min internal reaction.
So this embodiment technology is simple, be easy to operate and control, significantly save energy with alleviate CO
2Discharge, and can reduce the production cost of molten steel alloying of manganese significantly, have the high characteristics of yield of manganese.
Claims (2)
1. manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making; It is characterized in that: the common process blowing is pressed in converter; When molten steel carbon is reduced to below 0.1% when reaching 1650～1750 ℃ with liquid steel temperature disposable adding manganese oxide composite briquettes in converter; Stop then to the molten steel oxygen blast, simultaneously the converter argon bottom-blowing is reached maximum and carry out the molten bath stirring, promote manganese homogenizing in molten steel, converter is pressed the common process tapping after adding manganese oxide composite briquettes 2～5min;
Manganese oxide composite briquettes is with addition of coke powder or coal dust by manganese ore or rich manganese slag; Mix the back through coldmoulding obtain in join the carbon agglomerate, in join the carbon agglomerate interior mixed carbon comtent by in the manganese ore or the manganese oxide in the rich manganese slag and red stone all directly reduce consume 1.0～1.4 times of the carbon amount with addition of; The particle diameter of the manganese ore in the manganese oxide composite briquettes or rich manganese slag, coke powder or coal dust is below the 0.5mm.
2. manganese oxide composite briquettes used for re-blowing revolving furnace DIRECT ALLOYING process for making according to claim 1; The add-on that it is characterized in that described adding manganese oxide composite briquettes is to require to confirm according to the residual manganese amount of converter terminal target, counts steel per ton by MnO and adds 4～20kg.
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| CN2010102451021A CN101899604B (en) | 2010-08-03 | 2010-08-03 | Direct alloying steelmaking process for manganese oxide composite briquettes used for re-blowing revolving furnace |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8641800B2 (en) * | 2011-06-27 | 2014-02-04 | Joseph B. McMahan | Method of alloying various grades of steel with manganese oxides |
| CN104060017B (en) * | 2013-12-06 | 2016-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of semisteel converter steelmaking |
| CN105483321B (en) * | 2014-09-19 | 2018-02-27 | 鞍钢股份有限公司 | Method for direct alloying by adding manganese ore into vacuum induction furnace |
| CN105483314B (en) * | 2016-01-04 | 2018-04-24 | 首钢总公司 | A kind of control method for improving the residual manganese content of converter terminal |
| CN111411191B (en) * | 2020-05-29 | 2022-01-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for directly alloying manganese ore in semisteel steelmaking converter |
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| CN1057488A (en) * | 1990-06-15 | 1992-01-01 | 山东省冶金设计研究所 | The electric furnace steelmaking method of self-contained manganese ore reduction manganese |
| CN1415766A (en) * | 2002-10-10 | 2003-05-07 | 吴光亮 | Composite ball rolls of manganese and its preparation method |
| JP2003193121A (en) * | 2001-12-28 | 2003-07-09 | Jfe Engineering Kk | Method for refining molten iron |
| CN1470667A (en) * | 2003-07-04 | 2004-01-28 | 北京科技大学 | Manganese oxide direct-alloying steel making process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06116618A (en) * | 1992-10-01 | 1994-04-26 | Nippon Steel Corp | Production of molten steel |
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Patent Citations (4)
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| CN1057488A (en) * | 1990-06-15 | 1992-01-01 | 山东省冶金设计研究所 | The electric furnace steelmaking method of self-contained manganese ore reduction manganese |
| JP2003193121A (en) * | 2001-12-28 | 2003-07-09 | Jfe Engineering Kk | Method for refining molten iron |
| CN1415766A (en) * | 2002-10-10 | 2003-05-07 | 吴光亮 | Composite ball rolls of manganese and its preparation method |
| CN1470667A (en) * | 2003-07-04 | 2004-01-28 | 北京科技大学 | Manganese oxide direct-alloying steel making process |
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