CN101509052A - Deoxidization, acieration and alloying bottom blowing powder-spraying method for LF furnace - Google Patents

Deoxidization, acieration and alloying bottom blowing powder-spraying method for LF furnace Download PDF

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Publication number
CN101509052A
CN101509052A CNA2009100109060A CN200910010906A CN101509052A CN 101509052 A CN101509052 A CN 101509052A CN A2009100109060 A CNA2009100109060 A CN A2009100109060A CN 200910010906 A CN200910010906 A CN 200910010906A CN 101509052 A CN101509052 A CN 101509052A
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CN
China
Prior art keywords
stove
alloying
powder
furnace
carburelant
Prior art date
Application number
CNA2009100109060A
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Chinese (zh)
Inventor
罗志国
邹宗树
于景坤
王晓鸣
戴文斌
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东北大学
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Application filed by 东北大学 filed Critical 东北大学
Priority to CNA2009100109060A priority Critical patent/CN101509052A/en
Publication of CN101509052A publication Critical patent/CN101509052A/en

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Abstract

The invention relates to a method for deoxidation, carburetion, alloying bottom blowing powder injection by using an LF furnace, belonging to the field of metallurgical technology. Argon of an LF furnace argon blowing system is taken as a carrier, and carburetant, deoxidizing agent or alloyed powder are blown or sprayed into molten steel of the LF furnace though a ventilating element arranged at the bottom of the LF furnace. The method shortens the processing time of the LF furnace, reduces the running cost and better meets the requirements of continuous casting production while the quality requirements are met; as the carburetant, the deoxidizing agent, the alloyed powder and the like are sprayed from the bottom, the equipment investment and running cost of a overhead bunker and a wire feeding mechanism is reduced; furthermore, the technical operation is simple and easy to be mastered.

Description

The deoxidation of LF stove, carburetting, alloying bottom blowing powder injection method
Technical field
The invention belongs to metallurgical technology field, the deoxidation of particularly a kind of LF stove, carburetting, alloying bottom blowing powder injection method.
Background technology
LF is a kind of typical secondary refining means, and its main task comprises deoxidation, desulfurization, removes inclusion, intensification and adjust tapping temperature, also has the function that the molten steel chemical ingredientss are adjusted in alloying, carburetting etc. simultaneously.The LF furnace apparatus is simple, and the needs of visual quality control adopt different technological operating systems in the production, and the steel of process LF stove production can reach the higher quality level.
What LF stove alloying operation was at present adopted is to add alloy from high hopper, increases argon flow amount then and stirs, and what recarburization practice adopted is to increase the argon gas amount, blows the means that drop into carbon dust behind the top of the slag open.Increase argon flow amount and can cause the top of the slag exposed, make the molten steel oxidation; And the pulvis that adds from the top has part and drops on the slag blanket, can't incorporate molten steel, influences operations such as alloying, carburetting.And the wire feeder structure that ladle deoxidation adopted has also increased equipment cost.
Summary of the invention
At above technical problem, the invention provides the deoxidation of a kind of LF stove, carburetting, alloying bottom blowing powder injection method.
LF stove of the present invention deoxidation, carburetting, alloying bottom blowing powder injection method are:
With the argon gas in the LF stove blowing argon gas system is carrier gas, and carburelant, reductor or the alloy powder that will be in fluidized state are jetted in the molten steel of LF stove by the ventilated element of LF furnace bottom.
The granularity of carburelant, reductor or alloy powder is all less than 50 μ m, and the pressure of argon gas is 0.3~0.5MPa during winding-up.
Reductor among the present invention, carburelant and alloy powder comprise whole reductors, carburelant and the alloy powder in the existing refinery practice.
The mode of winding-up carburelant, reductor or alloy powder is jet separately carburelant, reductor or alloy powder, perhaps jet in order reductor, carburelant and alloy powder.
Used ventilated element is the slit-type ventilated element among the present invention.
Among the present invention, when the multiple pulvis of winding-up, earlier a kind of pulvis winding-up is finished the another kind of pulvis of jetting again; Jet in the LF stove by the order of reductor, carburelant and alloy powder, under the argon gas stirring condition, finish deoxidation, carburetting or the alloying of refined molten steel.
The present invention is on the basis of existing bottom argon blowing technology, control jetting pressure 0.3~0.5MPa, with Ar gas is that carrier gas is blown into pulvis such as carburelant, reductor, alloy powder, the pulvis that sprays into can all incorporate molten steel, utilizes whole strokes of the molten steel degree of depth simultaneously, increases the residence time in molten steel such as carburelant, reductor, alloy powder, increase operation rate, so also shorten the treatment time of LF stove, when satisfying specification of quality, more can satisfy the requirement that continuous casting is produced; Because pulvis such as carburelant, reductor, alloy powder all are to spray into from the bottom, reduced the facility investment and the running cost of high hopper, wire feeder structure; And technological operation is simple, grasps easily.
Description of drawings
Fig. 1 is existing Bottom Argon Blowing Device synoptic diagram;
Fig. 2 is the deoxidation of LF stove, carburetting, the alloying bottom blowing powder injection device synoptic diagram in the embodiment of the invention;
Among the figure 1, the LF stove, 2, molten steel, 3, ventilated element, 4, the total flux meter, 5, total pressure table, 6, total valve, 7, source of the gas, 8, gas distributor, 9, feed hopper, 10, powder spraying pot, 11, reinforced valve, 12, the valve that dusts, 13, the first flow meter, 14, second under meter, 15, the 3rd under meter, 16, first tensimeter, 17, second tensimeter, 18, the 3rd tensimeter, 19, the gas distributor tensimeter, 20, the fluidisation device.
Embodiment
The dusting device that adopts in the embodiment of the invention comprises LF stove, ventilated element, the powder spraying pot that has the fluidisation device, gas distributor and source of the gas, wherein the source of the gas outlet is by having the pipe connection gas distributor of valve, gas distributor is connected with the top of powder spraying pot by the pipeline that has under meter respectively, be connected with the fluidisation device of powder spraying pot, be connected with the ventilated element of LF furnace bottom, the pipe connection of the outlet of the fluidisation device of powder spraying pot by being provided with valve is on gas distributor and pipeline that ventilated element is connected.Wherein powder spraying pot is the conventional powder spraying pot that uses of industry.
The LF stove that adopts in the embodiment of the invention is a Medium frequency induction multifunctional high-temperature stove.
The wavelength width of a slit of the slit-type ventilated element that adopts in the embodiment of the invention is 0.13~0.18mm, and gap length is 15~30mm.
It below is the preferred embodiment of the present invention.
Embodiment 1
The deoxidation of LF stove, carburetting, alloying bottom blowing powder injection device are as shown in Figure 2, source of the gas 7 outlets are by pipe connection gas distributor 8, this pipeline is provided with total valve 6, gas distributor 8 is connected respectively to the top of the powder spraying pot 10 that has the fluidisation device, the fluidisation device 20 of powder spraying pot 10 and the ventilated element 3 of LF stove 1 bottom by pipeline, the outlet of fluidisation device 20 connects the pipeline that dusts, dust pipeline between pipe connection gas distributor and the ventilated element, and the pipeline that dusts is provided with the valve 12 that dusts.
Powder spraying pot 10 tops are provided with feed hopper 9, are provided with reinforced valve 11 between feed hopper 9 and the powder spraying pot 10.
Gas distributor 8 is provided with gas distributor tensimeter 19.
Wherein gas distributor 8 pipeline that is connected to powder spraying pot 10 tops is called first pipeline, and first pipeline is provided with first flow meter 13, and the pipeline between first flow meter 13 and the powder spraying pot 10 is provided with first tensimeter 16; The pipeline that gas distributor 8 is connected to fluidisation device 20 is called second pipeline, and the pipeline that second pipeline is provided with between second under meter, 14, the second under meters 14 and the powder spraying pot 10 is provided with second tensimeter 17; The pipeline that gas distributor 8 is connected to ventilated element 3 is called the 3rd pipeline, the 3rd pipeline is provided with the 3rd under meter 15, pipeline between the 3rd under meter 15 and the ventilated element 3 is provided with the 3rd tensimeter 18, the three tensimeters 18 and is dusting between pipeline and the gas distributor 8.
Powder spraying pot 10 cubic capacitys that comprise fluidisation device 20 are 0.015m 3
The LF stove is a 100kW/150kg Medium frequency induction multifunctional high-temperature stove.
The molten steel amount is 100kg in the LF stove, contains [C] after testing in the molten steel and is 0.08wt%, requires contain [C] in the target molten steel of winding-up back to be 0.14wt%.
With the 67g granularity is that the carbon dust (carburelant) of 40 μ m joins in the powder spraying pot 10 by feed hopper 9, closes reinforced valve 11.
When needs during Argon, are opened total valve 6 and the 3rd under meter 15 in LF stove 1, be communicated with between gas distributor 8 and the ventilated element 3, argon gas is fed in the LF stove 1; Gas distributor 8 and fluidisation device 20 are communicated with, gas distributor 8 and powder spraying pot 10 tops are communicated with, the valve 12 that dusts this moment is in closing condition, and the ar gas acting that carbon dust (carburelant) is blown in powder spraying pot 10 forms fluidized state.
(force value that the force value that this moment, second tensimeter showed shows greater than first tensimeter) opens the valve 12 that dusts under carbon dust (carburelant) fluidized state, and carbon dust (carburelant) enters ventilated element 3 under ar gas acting, and enters in the LF stove 1.
When wherein argon gas was jetted, the pressure of gas distributor tensimeter 19 was 0.3MPa, and the pulvis winding-up time is 6min.
Adopt above parameter, working process is smooth and easy, does not find latch up phenomenon; Molten steel after the winding-up is through check, and final carbon content is 0.136wt%, satisfies the target value requirement.
Embodiment 2
The deoxidation of LF stove, carburetting, alloying bottom blowing powder injection device are with embodiment 1.
The molten steel amount is 100kg in the LF stove, detects in the molten steel to contain [Mo]: 0.1wt%, requires contain [Mo] in the target molten steel of winding-up back to be 0.2wt%.
The molybdenum powder that with the 110g granularity is 40 μ m joins in the powder spraying pot 10 by feed hopper 9, by the embodiment 1 described mode molybdenum powder of in molten steel, jetting, difference is: during the argon gas winding-up, the pressure of gas distributor tensimeter 19 is 0.4MPa, and the pulvis winding-up time is 10min.
Adopt above parameter, process is smooth and easy, does not find latch up phenomenon; Molten steel after the winding-up is through check, and final molybdenum content is 0.22wt%, satisfies the target value requirement.
Embodiment 3
The deoxidation of LF stove, carburetting, alloying bottom blowing powder injection device are with embodiment 1.
The molten steel amount is 100kg in the LF stove, detects in the molten steel to contain [O]: 0.01wt%, requires contain [O] in the target molten steel of winding-up back to be 0.002wt%.
With the 20g granularity is that the CaSi powder (reductor) of 40 μ m joins in the powder spraying pot 10 by feed hopper 9, press the embodiment 1 described mode CaSi powder (reductor) of in molten steel, jetting, difference is: during the argon gas winding-up, the pressure of gas distributor tensimeter 19 is 0.5MPa, and the pulvis winding-up time is 12min.
Adopt above parameter, process is smooth and easy, does not find latch up phenomenon; Molten steel after the winding-up is through check, and final oxygen level is 0.0019wt%, satisfies the target value requirement.
Embodiment 4
The deoxidation of LF stove, carburetting, alloying bottom blowing powder injection device are with embodiment 1.
According to setting requirement, be respectively that CaSi (reductor), carbon dust (carburelant) and the molybdenum powder (alloy powder) of 40 μ m jetted in the molten steel bath with granularity.Press embodiment 1 described method, reductor is jetted in molten steel, difference exists: during the argon gas winding-up, the pressure of gas distributor tensimeter 19 is 0.5MPa; Winding-up finishes the back and add carburelant in powder spraying pot, by the method for winding-up reductor carburelant is jetted in molten steel, again by with quadrat method alloy powder being jetted in molten steel.Adopt above parameter, process is smooth and easy, does not find latch up phenomenon; Molten steel after the winding-up is through check, and each component content satisfies the target value requirement.

Claims (5)

1, a kind of LF stove deoxidation, carburetting, alloying bottom blowing powder injection method is characterized in that: with the argon gas in the LF stove blowing argon gas system is carrier gas, and carburelant, reductor and/or alloy powder are jetted in the molten steel of LF stove by the ventilated element of LF furnace bottom.
2, a kind of LF stove according to claim 1 deoxidation, carburetting, alloying bottom blowing powder injection method is characterized in that described carburelant, reductor and/or alloy powder are in fluidized state before entering ventilated element.
3, a kind of LF stove according to claim 1 deoxidation, carburetting, alloying bottom blowing powder injection method, the mode of carburelant, reductor and/or alloy powder of it is characterized in that jetting is winding-up carburelant, reductor or alloy powder separately, perhaps jet in order reductor, carburelant and alloy powder.
4, a kind of LF stove according to claim 1 deoxidation, carburetting, alloying bottom blowing powder injection method, the granularity that it is characterized in that described carburelant, reductor and alloy powder is all less than 50 μ m.
5, a kind of LF stove according to claim 1 deoxidation, carburetting, alloying bottom blowing powder injection method, when it is characterized in that jetting carburelant, reductor and/or alloy powder, the pressure of argon gas is 0.3~0.5MPa.
CNA2009100109060A 2009-03-27 2009-03-27 Deoxidization, acieration and alloying bottom blowing powder-spraying method for LF furnace CN101509052A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101787412A (en) * 2010-02-10 2010-07-28 武汉科技大学 Bottom dusting electrical furnace steelmaking process
CN101811180A (en) * 2010-05-10 2010-08-25 内蒙古科技大学 System device for adding rare earth into continuous casting tundish and adding method
CN102680532A (en) * 2012-04-25 2012-09-19 东北大学 Simulation device for hot metal pretreatment
CN102994694A (en) * 2011-09-10 2013-03-27 鞍钢股份有限公司 Method for efficiently carbureting LF furnace molten steel
CN102994695A (en) * 2012-12-12 2013-03-27 辽宁科技大学 Moistureproof LF bottom-blown dusting device
CN104611511A (en) * 2015-02-02 2015-05-13 西安宝科流体技术有限公司 Intelligent argon bottom-blowing powder spraying control system of coreless induction furnace and control method thereof
CN107737907A (en) * 2017-10-20 2018-02-27 辽宁科技大学 Using injection nano-particle and the uphill casting device and method of argon gas refinement ingot structure
CN107779550A (en) * 2017-09-30 2018-03-09 钢铁研究总院 A kind of method that molten steel manganeisen addition is reduced in refining process
CN109680115A (en) * 2019-01-31 2019-04-26 武汉科技大学 A kind of deoxidation and microalloying method for molten steel
CN110106316A (en) * 2019-05-14 2019-08-09 鞍钢股份有限公司 A kind of method of duplex production carbon aluminium-killed steel

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101787412A (en) * 2010-02-10 2010-07-28 武汉科技大学 Bottom dusting electrical furnace steelmaking process
CN101811180A (en) * 2010-05-10 2010-08-25 内蒙古科技大学 System device for adding rare earth into continuous casting tundish and adding method
CN102994694A (en) * 2011-09-10 2013-03-27 鞍钢股份有限公司 Method for efficiently carbureting LF furnace molten steel
CN102680532A (en) * 2012-04-25 2012-09-19 东北大学 Simulation device for hot metal pretreatment
CN102994695A (en) * 2012-12-12 2013-03-27 辽宁科技大学 Moistureproof LF bottom-blown dusting device
CN104611511A (en) * 2015-02-02 2015-05-13 西安宝科流体技术有限公司 Intelligent argon bottom-blowing powder spraying control system of coreless induction furnace and control method thereof
CN104611511B (en) * 2015-02-02 2017-09-29 西安宝科流体技术有限公司 Coreless induction furnace intelligence argon bottom-blowing dusts control system and its control method
CN107779550A (en) * 2017-09-30 2018-03-09 钢铁研究总院 A kind of method that molten steel manganeisen addition is reduced in refining process
CN107779550B (en) * 2017-09-30 2019-09-27 钢铁研究总院 The method of molten steel manganeisen additional amount is reduced in a kind of refining process
CN107737907A (en) * 2017-10-20 2018-02-27 辽宁科技大学 Using injection nano-particle and the uphill casting device and method of argon gas refinement ingot structure
CN107737907B (en) * 2017-10-20 2019-10-01 辽宁科技大学 Using the uphill casting device and method of blowing nanoparticle and argon gas refinement ingot structure
CN109680115A (en) * 2019-01-31 2019-04-26 武汉科技大学 A kind of deoxidation and microalloying method for molten steel
CN110106316A (en) * 2019-05-14 2019-08-09 鞍钢股份有限公司 A kind of method of duplex production carbon aluminium-killed steel

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Open date: 20090819