CN104531938B - A kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking - Google Patents
A kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking Download PDFInfo
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- CN104531938B CN104531938B CN201410789196.7A CN201410789196A CN104531938B CN 104531938 B CN104531938 B CN 104531938B CN 201410789196 A CN201410789196 A CN 201410789196A CN 104531938 B CN104531938 B CN 104531938B
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Abstract
The invention discloses the methods that a kind of blast furnace mud production pressure agent is used for pneumatic steelmaking, it is 1mm powdery granule below that discarded blast furnace mud, which is broken into granularity using gyratory crusher or Raymond mill, first, selects granularity stand-by to pressure ball production line in 1mm limestone powder roping below；The stemming powder and limestone powder are added in blender with mass percent for the ratio of 95:5, mixing is stirred using cyclic mode of operation, charging adds up to 5 tons every time, and pure mixing time is 35min after charging, then discharges；The above blend feedstock is added to dry powder ball press or refractory material ball press is pressed into the oval-shaped ball of 30 ± 5mm, drying post-tensioning transports to converter lines, the high hopper for being transported to converter using belt feeder system is stand-by, the oval-shaped ball is added during pressing slag and carries out defoaming pressure slag according to the process flow of normal use pressure agent for converter.
Description
Technical field
The present invention relates to the methods that a kind of blast furnace mud production pressure agent is used for pneumatic steelmaking.
Background technique
Stemming is the raw material that blast furnace is used to block iron mouth, is squeezed into iron mouth by clay gun by pressure, therefore claims stemming.It is high
Furnace stemming is the refractory material for blocking blast furnace tapping hole, can be divided into hydrous taphole loam and anhydrous stemming two major classes at present,
The former, which is used in, presses lower, and during strengthening smelting degree is not high, small blast furnace, the latter is pressing higher, and strengthening smelting degree is high
Large and medium-sized blast furnace on.But the composition of stemming can largely be divided into two parts: refractory aggregate and bonding agent.Refractory aggregate refers to just
The modified materials such as the refractory raw materials such as jade, mullite, flint clay and coke, mica.Bonding agent is water or tar asphalt and phenolic aldehyde tree
The organic materials such as rouge, also admixture SiC, Si3N4, swelling agent and additive etc..Aggregate forms matrix by certain granularity and weight,
With certain plasticity under the reconciliation of bonding agent, molten iron is blocked so as to squeeze into Tie Kou by clay gun.
Stemming using after certain period, small part can reuse, but the overwhelming majority is due in use,
The foreign matters such as scum are penetrated into, a possibility that it is utilized as refractory material reworked material is limited, are handled generally as waste outlet,
Since this waste contains graphitic carbon, belong to the serious waste of environmental hazard.Consulting literatures (1) beam righteous army, Feng Yunkang,
Paper that beam exchanges in from refractory material academic exchange paper meeting in 2 008 years to honor et al. " development of large blast furnace stemming with
Using " a text centre, do not refer to the processing method that stemming is discarded after using；(2) Zhang Jinyan, Fan Yonglian, Zhao Jun et al. are the tenth
Four Shanxi, Shandong, Henan, Ji, capital, distant six provinces (city) metal (metallurgy) learn the opinion delivered on refractory material seminar collection of thesis
The intermediate recycling for also not referring to discarded stemming of text " discarded application study of the refractory magnesia-alumina material in a stemming " text
Content statement；(3) Xu Guotao, Li Shuzhong, bear Asia and Africa et al. are delivered on " the national energy and 2010 Annual Conference of thermal technology "
Paper " development of high-strength environment-friendly stemming and in the application for newly opening blast furnace " (4) Yao Jinfu, Cui Wei equality people was in third in 2010
The paper " regeneration of iron and steel enterprise's used refractory " delivered on " refractory material " magazine of phase does not also refer to equally
Blast furnace discards the processing recovery process of stemming.Document more than access is it is found that there is presently no a kind of full dose processing blast furnace is discarded
The process of stemming.
Still further aspect, converter needs clinker pouring out major part out of furnace in the following two cases, in order to converter
Thermometric sampling operation and tapping steel, and optimization later period slag splashing technique implementation: 1, duplex practice carry out desiliconizing and dephosphorizing
Converter, after the task of desiliconizing and dephosphorizing, it is necessary to which the high phosphorus slag of major part in furnace is done down Slag treatment；2, double without implementing
The top and bottom combined blown converter for joining operating procedure, before the sampling of finishing blowing thermometric, it is necessary to pour out the part clinker in furnace；Above
In the case of two kinds, carbon and oxygen balance relationship of the converter between the when of falling slag, the clinker and molten steel of clinker is in dynamic non-equilibrium shape
State, so that the bubble level of clinker is relatively abundant, in the case, there are tidal phenomena in Converter, the quick when of falling slag, can be led
Molten iron is caused to gush out, in order to eliminate this contradiction, converter generallys use pressure agent and carries out that slag is pressed to disappear for the foamed slag in Converter
It steeps, implements based on the mechanism reduction slag viscosity of defoaming, pressure agent is mostly based on acid pressure agent.
Summary of the invention
The purpose of the present invention is to provide the methods that a kind of blast furnace mud production pressure agent is used for pneumatic steelmaking, using blast furnace
The defoaming pressure agent of discarded stemming as converter after using uses, and is bessemerizing terminal and fall furnace to fall and be added before slag, for defoaming
Slag is pressed, realizes the optimum use of discarded stemming resource, significant effect.
The object of the present invention is achieved like this, a kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking, first
It is 1mm powdery granule below that discarded blast furnace mud, which is first broken into granularity using gyratory crusher or Raymond mill, is selected
Granularity is stand-by to pressure ball production line in 1mm limestone powder roping below；By the stemming powder and limestone powder with
The ratio that mass percent is 95:5 is added in blender, is stirred mixing using cyclic mode of operation, and charging is total every time
It is 5 tons, pure mixing time is 35min after charging, is then discharged；The above blend feedstock is added to dry powder ball press or fire resisting
Material ball press is pressed into the oval-shaped ball of 30 ± 5mm, and drying post-tensioning is transported to converter lines, conveyed using belt feeder system
High hopper to converter is stand-by, and converter is added described according to the process flow of normal use pressure agent during pressing slag
Oval-shaped ball carries out defoaming pressure slag.
Technical principle of the invention is based on 4 points below: 1, since discarded stemming be a kind of discarded refractory material,
Refractoriness is at 1650 DEG C or so, and for the temperature of converter liquid steel slag at 1650~1720 DEG C, the modification slagging reaction of steel slag needs must
Directly block-like discarded blast furnace mud is added among the liquid steel slag of converter for the thermodynamic condition and dynamic conditions wanted, difficult
To react with the liquid steel slag of converter, play the role of defoaming pressure slag.Inventor will discard according to mechano-chemical reation principle
Blast furnace mud be broken into 1mm particle below, the crystal grain of stemming will generate distortion, and the variation of lattice energy is allowed to the left side 1mm
Right particle can issue raw reaction in the temperature condition of converter liquid steel slag, can satisfy the thermodynamic condition of reaction.2, it gives up
Graphitic carbon in the blast furnace mud of abandoning is reacted with iron oxide in slag, reduces the iron oxide content in slag, and reaching reduces clinker table
The purpose of face tension, the CO bubble generated in reaction process play float slag liquid is discharged during, into and foamed slag in
Between bubble in, increase in bubble gas for the pressure of bubble chamber film, play the purpose of chemical brokenly bubble defoaming, effective solution
The problem that graphitic carbon is difficult to be utilized among discarded stemming.3, the SiO among stemming is discarded2And Al2O3It can be with the Gao Rong in slag
Point substance tricalcium silicate and RO phase reaction, form the substance of low melting point, reduce the Gao Rong for facilitating slag bloating among clinker
The suspended matter particle of point is conducive to brokenly bubble defoaming, plays the role of pressing slag, the equation of reaction is as follows:
SiO2+ 3CaO•SiO2+MgO•2FeO→Fe2O3•2CaO +MgO •CaO•SiO2
3CaO•SiO2 + mAl2O3→nCaO•mAl2O3•SiO2
The pressure agent of converter routine is that converter is added from the high hopper of converter in a manner of the sphere of ellipse.It is powdered
Blast furnace discard stemming, if be directly added from the high hopper of converter, in adition process, the swabbing action of converter dust-removing blower
Under, powdered discarded blast furnace mud will largely be aspirated into dust pelletizing system, powdered blast furnace is directly discarded into stemming,
Production becomes pressure agent, and the graphitic carbon among discarded stemming in the short time, reacts in furnace, forms carbon fibre structure,
The progress of its highly effective reaction is hindered, inventor eliminates this problem thus, and 10% agstone is added during pressure ball
End, so that the pressure agent produced, after converter is added, limestone powder is heated rapidly to be expanded, while generating gas,
Promote pressure agent sphere fragmentation to be known as little particle, can rapidly participate in the reaction of defoaming pressure slag, realize the purpose of pressure slag, wherein
The equation that lime stone is thermally decomposed is as follows:
CaCO3 → CaO+CO2
△H=178.3kJ/mol
The present invention is based on foamed slag formation basic theory, in conjunction with the mechanism of physical defoaming and chemistry defoaming, after blast furnace is used
Stemming crush after, add the auxiliary element of part, production becomes the pressure agent of converter, applied in convertor steelmaking process,
While optimizing process for making, the application of the value maximization of stemming after realization blast furnace.Environmental benefit and remarkable in economical benefits.
The present invention solves the problems, such as that the carbon containing discarded stemming of blast furnace is intractable, eliminates the land occupation and pollution problem of discarded stemming outlet.
Graphitic carbon among blast furnace mud is used as reducing agent, and the stemming of every 1 ton of use is equivalent to the graphite using 350kg
Carbon, can iron oxide among reduced steel slag, generate 1.63 tons of metallic iron and directly enter in molten steel of melting bath from slag, improve refining
Recovery rate of iron during steel, ton iron generate 1500 yuan of direct economic benefit according to 1500 yuan of market price.Substitute converter
Traditional pressure agent carries out pressure slag, according to current 980 yuan of pressure agent of calculation of price per ton, removes the stone that production pressure agent needs
Lime stone powder and 400 yuan/ton of process cost meters, and can directly reduce by 580 yuan of steel-making expense.In conclusion every useless using 1 ton
The pressure agent for abandoning stemming production, can produce direct economic benefit 1500+580=2080 yuan.
Specific embodiment
Embodiment:
With a 3 × 2500m of outfit3Implement for the integrated iron and steel works of blast furnace and 3 × 120 tons of converters.Wherein blast furnace
Daily 15000 tons of tapping, generates 10 tons of discarded blast furnace mud, and converter produces 18000 tons of molten steel daily, needs pressure agent 15 daily
Ton.
1) by discarded blast furnace mud roping to broken region.
2) the small-sized unit for inertial conic of GYP-300 produced by Beijing Kaite Crusher Co., Ltd. is added in broken region to be crushed
It is broken into 1mm powdery granule below among machine, is packed using jumbo bag, roping is stand-by to pressure ball production line.
3) buying is by Xinjiang harmony Mining Market, and granularity is in 1mm limestone powder roping below to pressure ball production line
For use.
4) using the ST-25 biaxial rneader by being produced in Xinjiang with great Zheng scientific & technical corporation, stemming and lime that will be discarded
Stone powder is added in blender with mass percent for the ratio of 95:5, is stirred using the operation mode of cycle operation formula mixed
Even, 5 tons of charging every time, pure mixing time discharges after being 35min after charging, is transported to by then discharging.
5) above blend feedstock is added to dry powder ball press or the fire resisting of the HLX-6 type produced by Heng Longxiang company
Material ball press is pressed into the oval-shaped ball of 30 ± 5 mm, and drying post-tensioning transports to converter lines, defeated using belt feeder system
The high hopper for being sent to converter is stand-by.
Converter according to normal use pressure agent process flow, during pressing slag be added more than product carry out defoaming pressure
Slag.
Claims (1)
1. a kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking, it is characterised in that first by discarded blast furnace mud
Being broken into granularity using gyratory crusher or Raymond mill is 1mm powdery granule below, selects granularity in 1mm lime below
Stone powder roping is stand-by to pressure ball production line；It with mass percent is the ratio of 95:5 by the stemming powder and limestone powder
In example addition blender, mixing is stirred using cyclic mode of operation, charging adds up to 5 tons, after charging when pure stirring every time
Between be 35min, then discharge；By the above blend feedstock be added to dry powder ball press or refractory material ball press be pressed into 30 ±
The oval-shaped ball of 5mm, drying post-tensioning are transported to converter lines, are waited for using the high hopper that belt feeder system is transported to converter
With the oval-shaped ball is added during pressing slag and is defoamed according to the process flow of normal use pressure agent for converter
Press slag.
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| CN201410789196.7A CN104531938B (en) | 2014-12-19 | 2014-12-19 | A kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking |
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| CN201410789196.7A CN104531938B (en) | 2014-12-19 | 2014-12-19 | A kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking |
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| CN104531938B true CN104531938B (en) | 2019-01-29 |
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| CN105112580A (en) * | 2015-08-24 | 2015-12-02 | 新疆八一钢铁股份有限公司 | Technique for producing multifunctional converter slag pot defoaming agent |
| CN105132605A (en) * | 2015-09-02 | 2015-12-09 | 新疆八一钢铁股份有限公司 | Process for pressing slag and removing foam of converter slag tank by using blast furnace gas ash |
| CN105132613B (en) * | 2015-09-25 | 2017-10-10 | 唐山不锈钢有限责任公司 | The application and converter that gangue presses down slag agent as converter press down the method for slag |
| CN107236835A (en) * | 2017-06-30 | 2017-10-10 | 河南龙成煤高效技术应用有限公司 | A kind of method that steel cuttings cake enters blast furnace ironmaking |
| CN114717376B (en) * | 2022-05-13 | 2023-04-18 | 山东钢铁集团永锋临港有限公司 | Method for improving slag pressing effect |
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| JP3361581B2 (en) * | 1993-10-21 | 2003-01-07 | 日本坩堝株式会社 | Taphole filler |
| CN103484595B (en) * | 2013-09-17 | 2015-06-10 | 新疆中合大正商贸有限公司 | Production process of magnesian slag pressing agents |
| CN103451374B (en) * | 2013-09-22 | 2014-11-05 | 新疆中合大正商贸有限公司 | Production process of aluminium slag adjusting agent for LF refining furnace |
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