CN109306392A - A kind of use for refining molten steel air-flow dusts element with spray formula Ladle Bottom - Google Patents
A kind of use for refining molten steel air-flow dusts element with spray formula Ladle Bottom Download PDFInfo
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- CN109306392A CN109306392A CN201710888832.5A CN201710888832A CN109306392A CN 109306392 A CN109306392 A CN 109306392A CN 201710888832 A CN201710888832 A CN 201710888832A CN 109306392 A CN109306392 A CN 109306392A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/076—Use of slags or fluxes as treating agents
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
Ladle top spray powder steel secondary refining, has been the common process of molten steel furnace rear refining.Metallargist imagines in recent years, and in the existing BOTTOM ARGON BLOWING system-based of ladle, the tasks such as steel secondary refining desulfurization are completed using ladle bottom blowing powder injection.Currently, Ladle Bottom, which dusts, has only carried out investigative test in individual steel mills, the report of industrial applications yet there are no.Whether the Major Difficulties for hindering this technology commercialization to apply can repeatedly use for the bottom element that dusts.Thus, the invention discloses " a kind of use for refining molten steel air-flows with spray formula Ladle Bottom dust element ", its main feature is that dusting the outside or inside of element gas powder mixing jetting stream in Ladle Bottom, increases a gas passage and only spray gas (becoming companion's gaseous blast when bottom is dusted).This is with gaseous blast when stopping dusting, to have the function of that Ladle Bottom is prevented to dust element surface by molten steel and steel slag covering, a possibility that reduce the blocking of ladle bottom blowing element, it dusts the service life of element to improve Ladle Bottom, achievees the purpose that the Ladle Bottom more furnaces of element that dust spray use again.
Description
Technical field
The invention patent is suitable for steel secondary refining technology and apparatus field, and in particular to arrives a kind of " use for refining molten steel
Air-flow dusts element with spray formula Ladle Bottom ".
Background technique
1. foreword
Ladle top spray powder steel secondary refining desulfurization process has become most steel mill (especially medium and small section steel works) at present
The preferred technique of molten steel furnace rear refining processing.Since itself of ladle top spray powder steel secondary refining technique and its equipment are limited to
Property, while also under the increasingly mature inspiration of steel ladle bottom argon blowing technology, metallargist imagines in recent years, existing using ladle
On the basis of bottom blowing ar system, if the double refining desulfurization task of ladle can be completed using ladle bottom blowing powder injection.This
Ladle bottom blowing powder injection thought has caused the attention of vast steel-making worker in recent years.But answering due to this technology practical application
Polygamy, ladle bottom blowing powder injection have only carried out investigative test in individual steel mills, do not see the example report of industrial use also now.?
Industrially use whether the Major Difficulties of this technology have the performance repeatedly used for Bottom Blowing, powder element, that is,
Whether the service life of air supply device is able to satisfy the repeated requirement of STEELMAKING PRODUCTION.Ladle bottom blowing powder injection has been attempted to use at present
Slit ladle air supply device uses gas-solid mixing mode when dusting using argon gas as carrier, and pulvis is sprayed from ladle bottom
Enter molten steel (see Fig. 1,2,3).But since ladle is during transport, lifting, ladle bottom blowing element is interrupting Bottom Blowing, powder
After blowing, element surface will be covered by molten steel and steel slag.In next furnace, bottom blowing element will be not easy to lead to again to dust, thus meeting
Result in ladle bottom blowing component life sharp fall.Even after once dusting, it is difficult to realize multiple spray in lower furnace molten steel,
To which the development and practical application of this technology will be constrained.To solve this problem, a kind of " use for refining molten steel air-flow has been invented
Dust element with spray formula Ladle Bottom ", basic characteristics are to increase by a gas passage in the outside or inside of gas powder mixing jetting stream
Only injection gas (becoming companion's gaseous blast when dusting), sees Fig. 4,6,8.It, will be one since this is with the presence of gaseous blast
Determine to hinder element in degree in stop-spraying rear surface by molten steel and steel slag covering, to slow down channel of dusting significantly in powder autogenous cutting
It changes and a possibility that hot-metal carburized steel when stop-spraying, slag, improves the service life of element.Realize what the Ladle Bottom blowing more furnaces of element sprayed again
Purpose promotes the application and development of ladle bottom blowing powder injection steel secondary refining technology in production.
2. the technical meaning of steel spraying powder liquid steel refining
It is higher and higher to steel material quality requirement due to the demand of modern society's development in science and technology.Even if largely daily make
Conventional steels, it is also increasingly harsh because of use condition, and constantly propose higher quality requirement.It is therein important to want
One of ask, steel degree of purity is exactly continuously improved.After the degree of purity for improving steel, the mechanical strength etc. of steel can significantly improve
Service performance.Therefore, High Clean Steel Melts production technology is continued to develop, its refining equipment level is improved, it has also become optimization China's steel
The major tasks of the pattern of enterprises.
One of the vital task for improving steel degree of purity is exactly constantly to remove as much as possible in steel-making links
The impurity such as the sulphur in molten steel.Sulphur in steel will lead to the hot-short of steel, and sulfide is also the condition for generating steel hydrogen induced cracking
One of.So sulphur is harmful element (in addition to easy chip steel) in most of steel, wish to control more low in actual production more
It is good.It is well known that the thermodynamic condition of desulfurization is high temperature, high alkalinity, low oxidative.Converter steelmaking process feature determines,
Good desulfurization thermodynamic condition is not had in converter.And the molten steel after entering the pretreatment of the molten iron before converter and converter tapping
In double refining, then be had ideal desulfurization thermodynamic condition, while steel secondary refining be also control steel in sulphur most
Latter procedure.Although long-term production practices both at home and abroad show that molten iron pretreatment is to control into furnace molten steel sulfur content, smelt pure
Effective, the economic technological means of net steel, has become the essential process of STEELMAKING PRODUCTION.But due in subsequent converter smelting
In, the thermodynamic condition in converter is unfavorable for desulfurization (or even occurring increasing sulphur phenomenon in converter smelting), therefore it is pre- to depend merely on molten iron
It is more difficult that processing removing sulphur, which smelts clean steel,.For this purpose, metallargist has developed a variety of molten steel desulfurizings for many years
Secondary refining process, part of technique are as shown in table 1.
1 part secondary refining process of table and its desulfurization effect
| Serial number | Refinery practice abbreviation | Fining process | Desulfurization effect/[S]/10-6 | Remarks |
| 1 | LF | Electric heating plus block make reduction caustic slag | <10 | Normal pressure |
| 2 | VD | Vacuum plus block make reduction caustic slag | <10 | Vacuum |
| 3 | Steel spraying powder | Molten steel surface sprays CaO-CaF2Powder | <30 | Normal pressure |
| 4 | TN、KIP | It is blown CaO-CaF2-Al2O3Or Ca-Si | <10 | Normal pressure |
| 5 | V-KIP | Vacuum dusts and makes caustic slag | <10 | Vacuum |
| 6 | VOD-PB、RH-PB | Vacuum, spray CaO-CaF2Powder | <2 | Vacuum |
In the fining process shown in table 1, it can be mainly divided into two big technology types:
(1) to molten steel surface, add active metal, lime block, make high alkalinity reducing slag desulfurization；
(2) to molten steel surface, it is blown alkalinity CaO- powder, makes high basicity slag desulfurization.
Comprehensively consider from various aspects such as the cost of raw material, energy consumption and property easy to operate, the steel-making of steel spraying powder secondary fine
Water desulfurization process, it has also become the preferred technique of most steel mill's (especially medium and small section steel works) furnace post-processing.Using steel spraying powder
Double refining molten steel has the advantages that following rare:
(1) slag making is blown using fine powder, substantially increases the specific surface area of slag charge, promotes the fusing of basicity slag, add
Fast slagging speed.Increase slag steel reaction interface simultaneously, improves desulfuration efficiency；
(2) using the technical treatment molten steel that dusts, the gas for carrying pulvis again can be stirred molten steel, accelerate mass transfer, mention
Good slugging and desulfurization kinetics condition are supplied；
(3) due to pulvis heat absorption less, fusing it is fast, electric energy heating slugging can not be used, saved energy consumption, improve production
Environment；
(4) it dusts due to being continuously, the amount of dusting, which is easy to adopt, computerizeds control, and automation, intelligent behaviour may be implemented
Make.
For all the foregoing reasons, steel spraying powder refining techniques has obtained generally using.It is blown after tapping into ladle
Pulverized limestone carries out deep desulfurization, has been continuously available development, it has also become the conventional means of steel secondary refining.
The technical advantage of liquid steel refining 3. Ladle Bottom dusts
The double refining mode of dusting of current ladle molten steel in actual production, it is all to dust at the top of ladle.In steel
The steel secondary refining that dusts of packet top dusts outer science and engineering skill, can simply be divided into two kinds:
(1) one is in ladle, pulvis is sprayed to inside molten steel surface or molten steel, such as TN, KIP, V-KIP, VOD-
PB, steel spraying powder etc. (see Figure 11)；
(2) another kind is that pulvis is sprayed to the surface of molten steel, such as RH-PB in purifier (see Figure 12).
No matter but the former or the latter, belong to ladle top spray powder processing refining route.In top spray powder refining treatment,
It then needs from molten steel top or to be inserted from above in molten steel, using self-consuming or non-consumable formula top-blown spray gun to dust to molten steel.By
In feature of this processing mode itself, determine that it has following limitation in reality is practical:
(1) pulvis sprays to molten steel surface or top, and pulvis and the time that molten steel acts on are short, and pulvis cannot sufficiently connect with molten steel
Touching reaction, pulvis utilization rate are lower:
(2) when spray gun is inserted from above molten steel, spray gun will unavoidably pass through slag blanket and slag contacts, and steel slag then can be to rifle
Body occurs slag and invades, so as to shorten spray gun service life；
(3) top-blown spray gun lifting structure is complicated, gun body is heavy, and manufacturing cost is higher, improves refining cost；
(4) since the spray gun stroke being inserted into from molten steel top is subject to certain restrictions, and liquid steel level height is then with molten steel
The variation of amount and change, cause rifle position control should also be varied therewith, thus influence operation stability, cause desulfurization effect
Fluctuation；
(5) such as occur to have a power failure in blowing or mechanical accident, spray gun cannot put forward from ladle, then can damage rifle
Body, or even whole Baogang's water is caused to scrap.
(6) if in refining, spray gun fracture occurs and falls into the medium accident of molten steel, then to steel quality, smelting process time
Etc. causing significant impact.
The shortcomings that itself is handled due to above-mentioned ladle top spray powder and steel ladle bottom argon blowing technology it is increasingly mature, it is metallurgical in recent years
Worker is concerned about, and on the basis of using System for Blowing Argon at Bottom, ladle bottom blowing powder injection is carried out, to complete the secondary fine of ladle
Refining desulfurization task (see Fig. 3,10) has become possibility.This thought in recent years has caused the attention of vast steel-making worker, still
Due to the complexity of this technology practical application, ladle bottom blowing powder injection has only carried out investigative test in individual steel mills, does not have also now
See the example report of industrial use.
Using ladle bottom blowing powder injection steel secondary refining desulfurization technology, it will have the advantages that
(1) pulvis enters molten steel (see Fig. 3,10) from ladle bottom bottom blowing, and Argon Bubble and powder rise distance in molten steel
It is long, the reaction condition contacted for a long time between slag steel is provided, is fusing, the slagging of pulvis, the abundant reaction of slag steel provides foot
The enough time improves the service efficiency of desulfurization powder；
(2) bottom blowing powder injection slag making is used, the specific surface area of slag charge is substantially increased, promotes heat absorption slugging, increase
Slag steel reaction interface, accelerates slagging speed, improves desulfuration efficiency；
(3) it is dusted technical treatment molten steel the bottom of using, the gas bubble for carrying pulvis is floated since ladle bottom, expanded, can be compared with
Molten steel is sufficiently stirred for a long time, accelerates the mass transfer between steel slag, provides good slugging and desulfurization kinetics item
Part；
(4) while Ladle Bottom dusts, bottom ar blowing refining is also completed.Reach removal molten steel in pernicious gas and
Impurity, uniform molten steel composition and temperature purpose；
(5) do not need that system is tended to act in the lifting of dedicated top gun and heavy top spray gun gun body, steel spraying powder processing equipment are able to
It greatly simplifies, improves the reliability of equipment；
(6) investment for trnasforming urban land of Ladle Bottom powder spraying apparatus is low, does not change the original Argon function of ladle.
The technical complexity of liquid steel refining 4. Ladle Bottom dusts
The trial that normal slit formula bottom blowing element carries out injection refining (see Fig. 1,2,3) is now had been carried out, is dusted and jet
For same energy channel.The gases such as argon gas, nitrogen are then sprayed into the non-time of dusting, are then blown into pulvis in injection refining steel.In steel
On packet bottom-blowing air feed element, a plurality of slit of radial type (see Fig. 1) is generallyd use, main feature is as follows:
(1) since characteristic of dusting is determined, powder gas can be sent out in injection can pulsation phenomenon (out powder-stop-go out powder), that is, spraying
Moment gas-break phenomenon can be generated between the pulsation twice of powder；
(2) especially when switching to jet by dusting, of short duration gas-break phenomenon but will be generated；
(3) it during molten steel transport and handling, also needs to stop Bottom Blowing.
These factors will lead to molten steel and slag covers and block bottom blowing element, so that molten steel (slag) be caused to flow backward into dusting
Channel.It reloads element after molten steel to be difficult to restore to dust, so that Ladle Bottom be caused to dust component failure.Only re-replace steel
Packet bottom is dusted element, could be restored Ladle Bottom and be dusted steel secondary refining function.Cause the increase of steel-making cost, the dimension of ladle
Protect workload also substantial increase.Since these difficult points cause Ladle Bottom liquid steel refining technology of dusting to be difficult to significantly promote, from
And constrain further genralrlization application of this technology in big industrial production.Just because of the complexity of this technology practical application
Property, the report that Xian Haimeijian steel mill successful commercialization uses.Whether ladle bottom blowing powder injection successfully can successfully be carried out, and key is steel
Packet bottom blowing element.For the ladle bottom blowing powder injection element of a superperformance, following basic demand should be able to be met:
(1) ladle bottom blowing powder injection element also must can guarantee ladle while being able to satisfy spraying powder refining technique demand
Conventional BOTTOM ARGON BLOWING function；
(2) powder spraying system should ensure that can smoothly start to dust at any time, stop dusting at any time, and can carry out to input powder amount quasi-
Really metering can control dusting speed and the amount of dusting by technique requirement；
(3) it when carrying out Ladle Bottom injection refining, should accomplish Condensed transportation as far as possible, within the process time short as far as possible, complete
Convey powder amount required by technique；
It (4), should be in next furnace steel refining in the case where molten steel transportational process bottom blowing element broke gas, it is desirable that bottom spray member
Part has the function of that good pulvis and the multiple of gas spray again；
(5) after one heat steel water casting complete, after carrying out simple-to-maintain to bottom blowing element, Ladle Bottom spray can be restored
Gas and function of dusting, so that make it have more furnaces sprays function again, ladle bottom blowing powder injection element has longer hot service life.
In above requirements, can ladle bottom blowing powder injection element have good hot service life, be heavy to closing
It wants, and the key link of this technology can be used in mass production.
5. main points of the invention
5.1 basic principles of the invention
The present invention is exactly to have invented a kind of " use for refining molten steel to meet various rigors that above-mentioned Ladle Bottom dusts
Air-flow dusts element with spray formula Ladle Bottom ".This Ladle Bottom dust element basic structure as shown in Fig. 4,5,6,7,8,9,
Main feature is as follows:
It (1) can be by the shapes institute such as ring-like gap, straight type gap, round channel group with gaseous blast and two kinds of channels of dusting
At；
(2) dust passage proximate or around, have one or multi-channel gas passage, formed when dusting one or multi-channel
With gaseous blast；
(3) with jet circulation road section at any time, gas can only be sprayed；
(4) dust channel liquid steel refining processing when dust, it is non-dust Shi Zeke with jet carry out molten steel refined ladle；
(5) it powder, the ejection channel of gas and is tightly connected with jet circulation road, may be alternatively located at channel week of dusting with jet circulation road
It encloses；
It (6) is triangle expanding entrance at each feeder connection that dusts, to reduce the resistance to dust；
(7) at the medium inlet of element, then it is divided into gaseous blast and (gas) two kinds of independent channels (Fig. 5,7,9) of dusting.
While molten steel dusts and handles, ladle bottom blowing will be that continuously high speed ejection, jet stream are continuous with gaseous blast
And it is stable.After spraying into molten steel with gaseous blast, floating will acutely be expanded by meeting in high-temperature molten steel, and in a short time can be in the stream that dusts
Top or surrounding form the small space bubble of part.Exist in the stream stock (the gas powder mixed flow stock as composed by powder and carrier gas) to dust
When ejection, it will form powder-and stop-pulse jet the phenomenon of powder, a large amount of correlation test is confirmed for this.It is mixed in each gas powder
The moment of interflow pause blowing, there is molten steel and pour into element, the potential danger for causing element to block.Especially when stopping dusting
Switch to the moment of jet, it is most likely that cause element to block, to cause multiple spray difficult.In a kind of " use for refining molten steel air-flow
Dust element with spray formula Ladle Bottom " during this is bright, there will be a high-speed flow in minimum distance with spraying dusting to flow nearby.
Near gas powder mixed flow stock, there will be high-speed flow to spray together in minimum distance.This companion expanded with the high speed of spray
Gaseous blast channel of dusting local space formed bubble, between gas powder mixed flow once suspends, will will hinder molten steel and
Slag pours into element.Just because of this in channel overhead of dusting, the local space bubble of formation effectively prevents molten steel
And slag pours into bottom blowing element at any time, to improve the service life of ladle bottom blowing element, makes the multiplicating of element
With being possibly realized.This technology is refined for ladle bottom blowing powder injection, the application in mass production lays the foundation.
5.2 basic contents of the invention
The present invention is to be not easy multiple spray for using slit, and the susceptible to plugging feature present invention has invented a kind of " molten steel essence
Refining is dusted element with air-flow with spray formula Ladle Bottom ", BROAD SUMMARY are as follows:
The present invention is to be not easy multiple spray for solution slit type ladle bottom blowing element, and susceptible to plugging problem has invented a kind of " steel
Crystal, which refines, is dusted element with air-flow with spray formula Ladle Bottom ", claim is as follows:
(1) component structure that dusts of the invention is made of jet and the two types designated lane that dusts, and one is to dust
(gas) channel, one is air-flow with spray channel (Fig. 4,5,6,7,8,9)；
(2) element channel of dusting is dusted in processing stage in refinery practice, then sprays powder gas mixed flow stock, dust, use
Gas is as carrier (argon gas, nitrogen etc.).Non- in refinery practice is dusted the stage, then spraying is pure gas phase gas (argon gas, nitrogen
Deng), see Figure 10；
(3) companion's jet circulation road of element sprays pure gas phase gas (argon gas, nitrogen in production in all operation stages
Gas etc.), see Figure 10；
(4) it can be made of shapes such as ring-like gap, straight type gap, round channels with gaseous blast and two kinds of channels of dusting
(Fig. 4,5,6,7,8,9)；
(5) ring-like gap, straight type gap gap width be 0.1-20.0mm, the diameter in round channel is
It (6) is 0.1-100mm with the spacing between jet circulation road and channel of dusting；
It (7) is access road independent (Fig. 5,7,9) in the entrance of element ejection medium, powder gas and with gaseous blast；
It (8) can be gap, round channel shape at jet circulation road and the feeder connection that dusts；
It (9) can be the shapes such as expanding, tapered, to reduce the resistance to dust in the engaging portion for dusting channel and brick body；
(10) whole " a kind of use for refining molten steel air-flow with spray formula Ladle Bottom dust element " can by face refractory material or by
Metal tube separately constitutes, and can also form with refractory material or by metal tube mixing；
(11) in element inlet pipeline rapid abutting joint mouth downstream, repid cut-off valve (manually, automatic) is installed.
6. Detailed description of the invention
Attached drawing 1: used ladle bottom blowing jet, the attached view of powder element；
Attached drawing 2: used ladle bottom blowing jet, powder element section figure；
Attached drawing 3: used ladle bottom blowing powder injection refinery practice schematic diagram；
A kind of attached drawing 4: the present invention " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " (radial type gap and circumferential weld
Combination) attached view；
A kind of attached drawing 5: the present invention " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " (radial type gap and circumferential weld
Combination) sectional view；
A kind of attached drawing 6: the present invention " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " (linear gap and circumferential weld
Combination) attached view；
A kind of attached drawing 7: the present invention " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " (linear gap and circumferential weld
Combination) sectional view；
A kind of attached drawing 8: the present invention " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " (round to be combined with circumferential weld)
Attached view；
A kind of attached drawing 9: the present invention " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " (round to be combined with circumferential weld)
Sectional view；
Attached drawing 10: using the Ladle Bottom spraying powder refining technique schematic diagram of this patent；
Attached drawing 11: ladle top spraying powder refining technique schematic diagram；
Attached drawing 12:RH purifier top spraying powder refining technique schematic diagram.
It is described as follows in figure:
(1) Bottom Blowing, powder channel；
(2) bottom blowing is with gaseous blast designated lane；
(3) top spray gas, powder element.
7. the specific embodiment of the invention
Application example 1:
Using the medium-frequency induction furnace (simulation steel ladle) of 100 kilograms of magnesia sintered linings, ring is mounted in molten bath bottom
One, " the use for refining molten steel air-flow with spray formula Ladle Bottom dust element " of type, element central is that round channel is channel of dusting, outside
Circumferential weld is with jet channel.In practical applications, it is packed into 80 kilograms of cold steel, 1600 DEG C is heated to and is kept the temperature.It is heating
In the process, 3 kilograms of lime are added to molten steel surface, form top caustic slag and covers molten steel.Test process is as follows:
(1) while cold steel is added to molten bath, the outside companion of " use for refining molten steel air-flow with spray formula Ladle Bottom dust member "
Spray gas passage starts to be blown into argon gas 3Nm3/ h, inner channel powder gas channel are also blown into argon gas 3Nm3/h。
(2) when molten steel heating is to 1650 DEG C, the center channel Fen Qi starts switching and is blown into pulverized limestone, and flow is 1 kilogram/
Min and using argon gas as carrier gas is constant with jet body channel status.
(3) after center is dusted channel blowing pulverized limestone 3 minutes, stop blowing powder and switch to gas, with spray gas passage
State is constant.
(4) after each channel bottom blown gas 3 minutes, binary channels is all stopped the supple of gas or steam.
(5) stood after twenty minutes in molten steel, " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " start again jet,
It dusts, the above process is in triplicate.
After completing to test three times, " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " interior outer passage stops spray
Gas, it is after power failure that molten steel is net out.
On inspection, " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " surface of furnace bottom is mounted on not by bright
Aobvious melting loss, gas testing under cold conditions, examination powder injection is unobstructed to continue to use.Prove that " use for refining molten steel air-flow is with spray formula Ladle Bottom spray
Powder element " sprays performance with good under hot again, and service life can satisfy industrial needs.
Application example 2:
Using the medium-frequency induction furnace (simulation steel ladle) of 500 kilograms of magnesia sintered linings, ring is mounted in molten bath bottom
Two, type " use for refining molten steel air-flow with spray formula Ladle Bottom dust element ", every element central is that round channel is channel of dusting,
Outer circumferential weld is jet channel.In practical applications, it is packed into 200 kilograms of cold steel, 1600 DEG C is heated to, is kept the temperature.Adding
In thermal process, 8 kilograms of lime are added to molten steel surface, forms caustic slag and covers molten steel.Test process is as follows:
(1) before cold steel is added to molten bath, every " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " outside
Start to be blown into gas 3Nm with spray gas passage3/ h, inner channel powder gas channel is also to be blown into gas 3Nm3/h。
(2) when molten steel heating is to 1650 DEG C, powder gas channel starts switching and is blown into pulverized limestone, flow be 1 kilogram/min simultaneously
It is constant with jet body channel status using argon gas as carrier gas.
(3) after center is dusted channel blowing pulverized limestone 3 minutes, stop blowing powder and switch to gas, with spray gas passage
State is constant.
(4) after each channel bottom blown gas 3 minutes, binary channels is all stopped the supple of gas or steam.
(5) stood after twenty minutes in molten steel, " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " start again jet,
It dusts, repeats the above process three times.
" use for refining molten steel air-flow with spray formula Ladle Bottom dust element " interior outer passage stops jet after completing three times, stops
Electricity is net out by molten steel.
Be mounted on inspection two " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " surfaces of furnace bottom not by
Obvious melting loss can continue to use.Prove " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " it is hot it is lower have it is good
Multiple spray performance, service life can satisfy industrial needs.
Application example 3:
Using the medium-frequency induction furnace (simulation steel ladle) of 100 kilograms of magnesia sintered linings, it is mounted in molten bath bottom narrow
One, seam type " use for refining molten steel air-flow with spray formula Ladle Bottom dust element ", the multiple slits in element central portion are channel of dusting, week
Side ring type slit is with jet channel.In practical applications, it is packed into 80 kilograms of cold steel, 1650 DEG C is heated to and is kept the temperature.
During heating, 3 kilograms of lime are added to molten steel surface, form top caustic slag and covers molten steel.Test process is as follows:
(1) before cold steel is added to molten bath, the outside of " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " is with jet
Body channel starts to be blown into gas 3Nm3/ h, inner channel powder gas channel is also to be blown into gas 3Nm3/h。
(2) when molten steel heating is to 1650 DEG C, powder gas channel starts switching and is blown into pulverized limestone, flow be 1 kilogram/min simultaneously
It is constant with jet body channel status using argon gas as carrier gas.
(3) after center is dusted channel blowing pulverized limestone 3 minutes, stop blowing powder and switch to gas, with spray gas passage
State is constant.
(4) after each channel bottom blown gas 3 minutes, binary channels is all stopped the supple of gas or steam.
(5) stood after twenty minutes in molten steel, " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " start again jet,
It dusts, repeats the above process three times.
After completing to test three times, " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " interior outer passage stops spray
Gas, it is after power failure that molten steel is net out.
It is mounted on " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " surface of furnace bottom on inspection not by bright
Aobvious melting loss, gas testing under cold conditions, examination powder injection is unobstructed to continue to use.Prove that " use for refining molten steel air-flow is with spray formula Ladle Bottom spray
Powder element " sprays performance with good under hot again, and service life can satisfy industrial needs.
Application example 4:
Using the medium-frequency induction furnace (simulation steel ladle) of 500 kilograms of magnesia sintered linings, it is mounted in molten bath bottom narrow
Two, seam type " use for refining molten steel air-flow with spray formula Ladle Bottom dust element ", the narrow-gap channel at every element central position is to dust
Channel, periphery slit are with jet channel.In practical applications, it is packed into 200 kilograms of cold steel, heats to 1650 DEG C, is carried out
Heat preservation.During heating, 8 kilograms of lime are added to molten steel surface, form caustic slag and covers molten steel.Test process is as follows:
(1) before cold steel is added to molten bath, every " use for refining molten steel air-flow with spray formula Ladle Bottom dust element " outside
Start to be blown into gas 3Nm with spray gas passage3/ h, inner channel powder gas channel is also to be blown into gas 3Nm3/h。
(2) when molten steel heating is to 1650 DEG C, powder gas channel starts switching and is blown into pulverized limestone, flow be 1 kilogram/min simultaneously
It is constant with jet body channel status using argon gas as carrier gas.
(3) after center is dusted channel blowing pulverized limestone 3 minutes, stop blowing powder and switch to gas, with spray gas passage
State is constant.
(4) after each channel bottom blown gas 3 minutes, binary channels is all stopped the supple of gas or steam.
(5) stood after twenty minutes in molten steel, " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " start again jet,
It dusts, repeats the above process three times.
Stop completing interior outer passage three times after jet powder " use for refining molten steel air-flow with spray formula Ladle Bottom dust element "
Jet has a power failure molten steel is net out.
Be mounted on inspection two " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " surfaces of furnace bottom not by
Obvious melting loss can continue to use.Prove " use for refining molten steel air-flow with spray formula Ladle Bottom dust member " it is hot it is lower have it is good
Multiple spray performance, service life can satisfy industrial needs.
Claims (11)
1. the component structure that dusts of the invention is made of jet and the two types designated lane that dusts, one for dust (gas) it is logical
Road, one is air-flow with spray channel (Fig. 4,5,6,7,8,9).
2. element dusts, channel is dusted in processing stage in refinery practice, then sprays powder gas mixed flow stock, is dusted then using gas
As carrier (argon gas, nitrogen etc.)；Non- in refinery practice is dusted the stage, then spraying is pure gas phase gas (argon gas, nitrogen etc.),
See Figure 10.
3. companion's jet circulation road of element in all operation stages, sprays pure gas phase gas (argon gas, nitrogen etc.) in production,
See Figure 10.
4. can be made of shapes such as ring-like gap, straight type gap, round channels with gaseous blast and two kinds of channels of dusting (Fig. 4,
5、6、7、8、9)。
5. the gap width in ring-like gap, straight type gap is 0.1-20.0mm, the diameter in round channel is
6. being 0.1-100mm with the spacing between jet circulation road and channel of dusting.
7. in the entrance of element ejection medium, powder gas and be access road independent (Fig. 5,7,9) with gaseous blast.
8. can be gap, round channel shape at jet circulation road and the feeder connection that dusts.
9. can be the shapes such as expanding, tapered, to reduce the resistance to dust in the engaging portion for dusting channel and brick body.
" a kind of use for refining molten steel air-flow with spray formula Ladle Bottom dust element " can be by face refractory material or by metal tube 10. whole
It separately constitutes, can also be formed with refractory material or by metal tube mixing.
11. in element inlet pipeline rapid abutting joint mouth downstream, installation repid cut-off valve (manually, automatic).
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|---|---|---|---|
| CN201710610299 | 2017-07-27 | ||
| CN2017106102996 | 2017-07-27 |
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| Publication Number | Publication Date |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110042187A (en) * | 2019-05-30 | 2019-07-23 | 无锡东大汉森冶金实业有限公司 | When converter tapping clinker dust modification and slag steel separation device and application method |
| CN115161435A (en) * | 2022-07-05 | 2022-10-11 | 鞍钢股份有限公司 | Method for controlling sulfur and sulfide inclusions in heavy rail steel |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967532A (en) * | 2010-11-11 | 2011-02-09 | 河北钢铁股份有限公司承德分公司 | Powder spraying device and method for efficient vanadium extracting process of converter |
-
2017
- 2017-09-28 CN CN201710888832.5A patent/CN109306392A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101967532A (en) * | 2010-11-11 | 2011-02-09 | 河北钢铁股份有限公司承德分公司 | Powder spraying device and method for efficient vanadium extracting process of converter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110042187A (en) * | 2019-05-30 | 2019-07-23 | 无锡东大汉森冶金实业有限公司 | When converter tapping clinker dust modification and slag steel separation device and application method |
| CN110042187B (en) * | 2019-05-30 | 2024-05-28 | 苏州东大汉森冶金实业有限公司 | Device for modifying slag powder spraying and separating slag steel during converter tapping and use method |
| CN115161435A (en) * | 2022-07-05 | 2022-10-11 | 鞍钢股份有限公司 | Method for controlling sulfur and sulfide inclusions in heavy rail steel |
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Application publication date: 20190205 |