CN1665942B - Metallurgical treatment method on a metal bath - Google Patents
Metallurgical treatment method on a metal bath Download PDFInfo
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- CN1665942B CN1665942B CN038153289A CN03815328A CN1665942B CN 1665942 B CN1665942 B CN 1665942B CN 038153289 A CN038153289 A CN 038153289A CN 03815328 A CN03815328 A CN 03815328A CN 1665942 B CN1665942 B CN 1665942B
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- Prior art keywords
- molten metal
- bath
- slag
- material lid
- thick material
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 49
- 239000002184 metal Substances 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000002893 slag Substances 0.000 claims abstract description 76
- 239000002253 acid Substances 0.000 claims abstract description 20
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 63
- 238000006477 desulfuration reaction Methods 0.000 claims description 36
- 230000023556 desulfurization Effects 0.000 claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910001018 Cast iron Inorganic materials 0.000 claims description 16
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- 239000011261 inert gas Substances 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 6
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 5
- 229910000863 Ferronickel Inorganic materials 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 238000005272 metallurgy Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 40
- 239000010959 steel Substances 0.000 description 40
- 235000003599 food sweetener Nutrition 0.000 description 17
- 239000003765 sweetening agent Substances 0.000 description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 16
- 238000003886 thermite process Methods 0.000 description 11
- 229910052786 argon Inorganic materials 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 239000004411 aluminium Substances 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 235000017550 sodium carbonate Nutrition 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- 241001024304 Mino Species 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000003287 bathing Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007654 immersion Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- 229960001708 magnesium carbonate Drugs 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 235000000396 iron Nutrition 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000010412 perfusion Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229960001866 silicon dioxide Drugs 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
Classifications
-
- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
-
- 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
- C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Coating With Molten Metal (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a metallurgical treatment method on a metal bath. The inventive method comprises a first treatment involving the presence or formation of an acid slag on the surface of the metal bath and a second treatment involving the presence or formation of a basic slag on the surface of said metal bath. According to the invention, no intermediate deslagging is performed during said two processes, thereby ensuring that a physical separation exists between an acid slag zone and a basic slag zone on the surface of the metal bath.
Description
The technical field that the present invention is correlated with
The present invention relates generally to a kind of metallurgical treatment process to bath of molten metal.Relate more particularly to a kind of like this method, it comprise comprise a kind of exist on bath of molten metal surface or form first of a kind of acid slag handle and comprise a kind of exist or form second of a kind of basic slag on this bath of molten metal surface handle.
Prior art
Such method is for example a kind of method of handling raw steel in the molten steel jar.Wherein, carrying out desulfurization processing (promptly handling) and/or dephosphorization treatment (promptly handling low phosphorus content) before, at first by the bath of thermite process heating and melting steel than low sulfur content.Between heating period, aluminium and oxygen reaction form acid Al on the bath of molten steel surface in thermite process
2O
3Slag.In fact, need desulfurization processing, the dephosphorization treatment of basic slag to be melted the acid Al that steel is bathed the surface existence respectively on the bath of molten steel surface
2O
3Slag suppresses.Therefore, acid Al
2O
3Slag must at first be wanted skimming (scorification) before beginning desulfurization and/or dephosphorization treatment.In fact, this middle slagging has greatly prolonged the total time of handling, and is not all feasible under each metallurgical disposition.
In order to increase the efficient of bath of molten metal in the thermite process heating molten steel jar, be well known that how under the material lid, to heat (referring to the example among the US 4518422A).By injecting inert gas, at first in the initial slag layer that covers bath of molten metal, form one " window ".To expect that lid is reduced to this " window " top and immerses in the bath of molten metal up to its bottom margin.Under this material lid, add the thermite process reactant, just aluminium and oxygen.By injecting inert gas, stirring molten metal is bathed simultaneously.Preferred material lid can make thermite process heat under protective atmosphere, and to the environmental loss minimum.When the thermite process heating finishes, remove the material lid.Slag around the material lid and the Al that under the material lid, forms
2O
3Slag mixes, and produces a kind of slag, its Al
2O
3Content (＞40%) suppresses desulfurization and/or dephosphorization treatment subsequently.
In the other method of type described in the preamble is that the former cast-iron molten bath of a kind of wherein fusion or molten pig alloy baths must be by the desiliconization (promptly handling low silicon content) of oxygen injection and the methods of desulfurization and/or dephosphorization.Desiliconization by the oxygen injection produces a kind of acid SiO on the bath of molten metal surface
2Slag.In fact, desulfurization is subsequently handled need exist basic slag on the bath of molten steel surface, and quilt is more than 10% SiO
2Content suppresses.Thereby must before handling, the beginning desulfurization be skimmed (scorification) at the acid slag that forms during the desiliconization.As what explained, this middle slagging has greatly prolonged the time of method, and is not all feasible under each metallurgical disposition.
Goal of the invention
The objective of the invention is to optimize metallurgical method, wherein first processing is included in the existence of bath of molten metal surface or forms acid slag, and second processing is included in the surface existence of this bath of molten metal or forms basic slag.
Invention is described
According to the present invention, by not having middle slagging, while or carry out two processing two disengaging zone continuously, and provide a kind of physical sepn to reach this purpose by the bath of molten metal surface between acid slag district and basic slag district.In order to save maximum time, preferred two processing are carried out simultaneously.In some cases, it is favourable may at first stopping or begin first processing before beginning second be handled, and vice versa.Under any circumstance, it all is favourable saving the time that is used for middle slagging, and can carry out two processing in independent metallurgical treatment bench, and this treatment bench is unnecessary to being carried out to slag operation (slagging can be finished) anywhere.
In preferred enforcement in two processing one carries out under its bottom margin immerses the thick material lid of bath of molten metal, and another processing is to carry out around this thick material lid.This thick material covers between two slag districts of bathing the surface physical sepn is provided, and allows one of two processing simultaneously under protective atmosphere, to the loss minimum of environment.If it is unnecessary developing other advantage of thick material lid, but also can use independent partition wall to provide physical sepn with the bath of molten metal surface between acid slag district and basic slag district.This partition wall or combine the bath of molten metal surface is divided into two districts arranged side by side with the edge of metallurgical tank perhaps forms a kind of ring to define one " island " in the inside on bath of molten metal surface.
First processing is for example to carry out and produce under the material lid chemical heat of acid slag under the thick material lid under protective atmosphere.The chemical heat here is meant common metal, as the high exothermic oxidation of aluminium (thermite process) or silicon (silicothermic process).
First to handle can also be that desiliconization by the oxygen injection is handled, especially as cast iron or iron alloy (as the ferronickel) part with the processing of high silicon content.Desiliconization processing by the oxygen injection is also advantageously carried out under the thick material lid of its bottom margin immersion bath of molten metal.
Second processing is for example to comprise the desulfurization and/or the dephosphorization treatment that form basic slag as lime, yellow soda ash, magnesiumcarbonate etc. by adding.This processing can be carried out on every side at the thick material lid that carries out first processing.
As the part of handling by the desiliconization of oxygen injection, desulfurization and/or dephosphorization treatment advantageously comprise and add Wingdale, particularly castine in bath of molten metal.This is a kind of cheap and very effective sweetening agent, but its decomposition causes high thermo-negative reaction in bath of molten metal, and this causes cooling molten metal to be bathed.In fact, in conjunction with the desiliconization by the oxygen injection, this cooling effect is difficult to cause any problem, because the desilication reaction of high heat release under any circumstance all produces too much heat.
If use thick material lid to provide physical sepn with the bath of molten metal surface between acid slag district and basic slag district, method is advantageously following carries out: injecting inert gas at first, in the initial slag layer that covers the bath of molten metal surface, to form one " window "; This " window " uses the thick material that its bottom margin immerses bath of molten metal to cover; Under thick material lid, carry out in two processing, and around thick material lid, carry out another, the stirring molten metal bath by injecting inert gas simultaneously; And when these two processing finish, stop to stir, remove thick material lid, skim two kinds of slags (scorification) more immediately.Stopped to stir to stop two kinds of slags to mix too much before removing thick material lid, this result to method is unfavorable.
According to the present invention, further feature of present method and character will represent from the several embodiment that describe below, and with reference to accompanying drawing 1, it is the synoptic diagram of realizing according to the inventive method.
The detailed description of some advantageous embodiment of the present invention
For the present invention is described, Fig. 1 is used for describing in more detail a kind of metallurgical method, and the molten steel jar desulfurization that its chemical heat fusion raw steel before that is included in the molten steel jar of bath of molten steel is bathed is handled.
Fig. 1 is presented at and implements the metallurgical molten steel jar 10 in metallurgical treatment bench during the preceding method.Under virgin state, molten steel jar 10 comprises the molten bath 12 of the raw steel from converter or electric furnace and covers the basic furnace slag blanket of the remnants of bath of molten steel.In metallurgical treatment bench, at first injecting inert gas is to form window 14 on remaining slag layer, and promptly bath of molten steel is separated out the remaining slag on covering it at least in part in a zone on bath of molten steel 12 surfaces.On window 14, be mounted with thick material lid 16, so that its bottom margin 18 immerses bath of molten metal 12 to 20cm at least (bath of molten metal 12 splashes many more, and it is dark more that material covers 16 bottom margin immersion).Can observe that a kind of what may implement this thick material lid 16 is for example described in the patent application WO 98/31841, though the material that uses in present method lid and need not be rotation material lid.
Cover below 16 at material, bathe by thermite process heating and melting steel.For this purpose, cover 16 times at material and add aluminium and be blown into oxygen, shown in arrow 18 and 20.Simultaneously, by stirring of inert gas bath of molten metal 12, rare gas element preferably uses lateral jet pipe 22 to inject bath of molten metal 12.Aluminium and oxygen react with high thermopositive reaction.This reaction causes covering 16 times at material and forms acid Al
2O
3Slag.In Fig. 1, determine acid Al by numeral 24
2O
3Slag.
In the prior art, when chemical heat finishes, promote material and cover 16 to skim Al residual, that the quilting lid forms for 16 times
2O
3The slag that slag is highly polluted.Carrying out desulfurization again in separating out the bath of molten steel of slag handles.In fact, well-known, carry out desulfurization and/or dephosphorization treatment, the Al of slag in order to use basic slag
2O
3Content must be lower than 40%.
According to the present invention, in the middle of not having, become under the slag operation, around covering 16, material carries out desulfurization and/or dephosphorization treatment.For this purpose, use jet pipe 26 to be used for covering the preparation that forms basic slag 28 around 16 at bath of molten metal 12 material with injection.The formation agent of basic slag 28 can, for example be, lime, Wingdale, castine, yellow soda ash, magnesiumcarbonate etc.Material covers 16 and stops the acid Al that covers 16 times formation at material
2O
3Basic slag around slag and the molten steel jar 16 mixes mutually, makes it can not have middle the slagging ground while or carries out two processing continuously.Preferably at first begin thermite process heating, then, when bath of molten steel has reached enough temperature, begin desulfurization and/or dephosphorization treatment again.
When desulfurization and/or dephosphorization treatment end, cover all stirrings that stopped bath of molten metal before 16 at the lifting material.Skim two kinds of slags then together.
It should be noted that and handle also passablely under material lid, for example, is the passing through the oxygen injection of cast iron or iron alloy, particularly ferronickel and desiliconization is handled.In this case, silicon forms acid SiO with the oxygen reaction that the material lid is blown into down under the material lid
2Slag.Around the material lid, carry out above-mentioned desulfurization and/or dephosphorization treatment then.The material lid stops material to cover the acid SiO that forms for 16 times
2Basic slag around slag and the molten steel jar 16 mixes, makes its while or carry out two processing continuously with can not having middle slagging.In fact, for effective desulfurization and/or dephosphorization treatment, the SiO of basic slag
2Content can not surpass 10%.
Embodiment 1
This embodiment relates to the molten steel jar processing that a kind of purpose is the former converter steel of steel 80% desulfurization.
Original state: metallurgical molten steel jar comprises 160 tons of former converter steels and the residual refinery scum of 600kg.Analytical results is as follows: 0.04% C, the O of 600ppm, 0.010% S.The temperature of bath of molten steel is 1600 ℃.The CaO that when perfusion, adds 200kg deoxidation Al and 600kg.
The thermite process heating: first processing is the thermite process heating, and as shown in Figure 1, it occurs under the thick material lid that is positioned at the top, bath of molten steel district of separating out remaining slag layer in advance.By in 7 minutes, injecting aluminium and the 350m of 530kg
3Oxygen (with 50m
3/ minO
2Speed), the temperature of bath of molten steel increases about 90 ℃.By using lateral jet pipe with 0.2m
3The injection rate of/min is injected argon and is caused in the stirring of expecting under the lid.
Desulfurization: second processing is to occur in intensive 80% desulfurization on every side of material lid.The sweetening agent that uses is by 60% CaO and 35% Al
2O
3The powder of forming remains and is impurity.Al
2O
3Adding be flowability for the slag of adjusting acquisition.The Shanghai slag agent that also can add other.
Use argon as carrier gas, inject sweetening agent by means of a buried jet pipe.Before beginning to inject sweetening agent, use the injection jet pipe that bath of molten steel is formerly stirred.For this purpose, the injection jet pipe is with about 0.5m
3The speed of/min was supplied argon gas 5 minutes, and stopped the supply of sweetening agent.This preliminary stirring makes its especially even temperature of bath of molten steel before desulfurization especially.Then, in about 12 minutes timed interval, the sweetening agent that 960kg is above-mentioned with as carrier gas with about 1m
3The argon of/min flow velocity (feeding-in solid body speed is about 80kg/min) injects together.By with same jet pipe, with about 1m
3The argon of/min speed carried out high degree of agitation 5 minutes, and stopped the supply of sweetening agent and termination.Stop then stirring and promote material and cover.
Final state
Steel: 0.04% C, 0.002% S, temperature is about: 1600 ℃.
Slag: the Al of the about 1000kg that under the material lid, forms
2O
3Desulfurization slag with about 2500kg around the material lid.
Comment:
Reach medium steel desulfurization iff needs, can not need to use jet pipe in bathing, to inject sweetening agent.In fact, the remaining slag around the material lid has comprised the sweetening agent of q.s, to reach medium steel desulfurization.Around material lid, be enough to stir bath of molten steel then so that its with swim in its lip-deep remaining slag reaction and, if necessary, further add the denseness of slag agent with special adjustment slag.
Embodiment 2
This example relates to the molten steel jar of the former cast iron of desiliconization that a kind of purpose is a cast iron and desulfurization to be handled.
Virgin state: metallurgical molten steel jar comprises 100 tons of former cast irons, and its analytical results is as follows: 4.5% C, 0.8% Si, 0.10% S.The temperature that molten cast iron is bathed is 1350 ℃.Cast iron is covered by the alkaline slag layer of remnants.
Desiliconization is handled: as mentioned above, be to carry out under the thick material lid that is being positioned at above the bath district that remaining slag layer is separated out in advance from it handling by the desiliconization of oxygen injection.Under the material lid, in 10 minutes, inject 450m
3Oxygen (with 45m
3/ minO
2Speed).Use lateral jet pipe with 0.2m
3The speed of/min is injected under the material lid by argon and stirs.
Desulfurization: desulfurization is to take place around the material lid.The sweetening agent that uses is by 70% CaCO
3With 30% Na
2CO
2The powder of forming.The slag agent that also can add other.
Use argon as carrier gas, inject sweetening agent by means of submergent entry nozzle.With about 1m
3The argon of/min in about 20 minutes time, injects the above-mentioned sweetening agent of about 1000kg (solid velocity is about 50kg/min) as carrier gas.After stopping all stirrings, promote the material lid and skims two kinds of slags together.
Final state:
Give processing cast iron: 4.3% C, 0.4% Si, 0.02% S, temperature is about: 1400 ℃.
Slag: the SiO of the about 860kg that under the material lid, forms
2, add desulfurization slag at material lid about 700kg on every side.
Comment to the cast iron processing:
In the desulfurization of traditional direct current (once-through) cast iron, use Mg-CaC usually
2Or the mixture of Mg-CaO is as sweetening agent.These are efficient desulfurizing agents, but also are very expensive.Use them mainly to be because they make the limited cooling of bath of molten metal.In fact, desulfurization combines with high heat release desiliconization and makes it may use more refrigerative but more cheap sweetening agent such as Wingdale (CaCO
3) or castine.CaCO in bath of molten metal
3Or Na
2CO
3Decomposition also produce oxygen, this helps the desiliconization (CaCO of 1kg of cast iron
3Or Na
2CO
3Reduce about 0.1m
3The requirement of oxygen of desiliconization).And, preferably use CaCO
3+ Na
2CO
3Mixture, obtaining more mobile slag, thereby and be limited in the slagging course loss because of the iron clamp band.Yet, use Na
2CO
3Also need limit temperature to 1400 ℃, to prevent losing Na by evaporation
2CO
3
Comment to the iron alloy processing:
For the molten pig alloy baths, particularly the bath of fusion ferronickel is favourable, also carries out as combining to desiliconization among the embodiment 2 of cast iron and desulfurization.
Yet, in the ferronickel example, to carry out in the mode of embodiment, purpose normally reaches intensive desiliconization more (to reduce Si content more than 1%).By the desiliconization of oxygen injection, when lacking effective refrigerant, can cause that temperature raises 300 ℃ or higher.
As carrying out in some cast iron desiliconization process, iron ore or oxide compound can be used as refrigerant and use, and it is obtained by the manufacturing by product of steel.Yet, using the method for being advised in conjunction with desiliconization and desulfurization, particularly advantageous uses castine (CaCO
3) and/or yellow soda ash (Na
2CO
3) as sweetening agent, because these products all are strong refrigerant and effective sweetening agent, as long as they are by adding silicon-dioxide (SiO
2) and dilute.
Except quantitative aspect (reduce the Si content of 1-2% rather than to the 0.2-0.4% of blast furnace cast iron), by adjusting the ratio of oxygen and required cooling/sweetening agent, can be applied to iron alloy similarly to the proposed method of cast iron.
Claims (11)
1. a method that is used for the metallurgy processing of bath of molten metal comprises:
First handles, and it is included in and exists on the described bath of molten metal surface or the formation acid slag; With
Second handles, and it is included in and exists on the described bath of molten metal surface or the formation basic slag;
It is characterized in that, there are not two processing of middle slagging simultaneously two disengaging zone by on the described bath of molten metal surface between acid slag district and the basic slag district, providing physical sepn, wherein said first processing is that the chemical heat of carrying out under described thick material lid is handled, the bottom margin of this thick material lid immerses in the described bath of molten metal, and another processing is to carry out around described thick material lid.
2. the method for claim 1, it is aluminothermy or silicothermic process that wherein said chemical heat is handled.
3. the method for claim 1, wherein said second handles desulfurization and/or the dephosphorization treatment that is based on basic slag.
4. the method for claim 1, wherein said first to handle be to cast iron or iron alloy, handles by the desiliconization of oxygen injection.
5. the method for claim 1, wherein said first to handle be to ferronickel, handles by the desiliconization of oxygen injection.
6. method as claimed in claim 4, wherein said second handles desulfurization and/or the dephosphorization treatment that is based on lime.
7. method as claimed in claim 4, it is to carry out under its bottom margin immerses the thick material lid of described bath of molten metal that wherein said desiliconization by oxygen injection is handled, and described second to handle be to carry out desulfurization and/or dephosphorization treatment around described thick material lid.
8. method as claimed in claim 7, wherein said second handles desulfurization and/or the dephosphorization treatment that is based on lime.
9. method as claimed in claim 8, wherein said second handles and to comprise in described bath of molten metal and add Wingdale.
10. method as claimed in claim 8, wherein said second handles and to comprise in described bath of molten metal and add castine.
11. as arbitrary described method among the claim 1-10, wherein:
When the beginning of described method, the surface of described bath of molten metal is covered by the remaining slag of one deck;
By injecting inert gas, in described remaining slag layer, form a window;
Described window is covered by the thick material lid that its bottom margin immerses described bath of molten metal;
Under described thick material lid, carry out in two processing, around thick material lid, carry out another, bathe by the injecting inert gas stirring molten metal simultaneously; With
When two processing finish, stop described stirring, remove described thick material lid, skim two kinds of slags then immediately.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU90924 | 2002-05-24 | ||
| LU90924A LU90924B1 (en) | 2002-05-24 | 2002-05-24 | Metallurgical treatment process on a metal bath |
| PCT/EP2003/050183 WO2003100102A2 (en) | 2002-05-24 | 2003-05-21 | Metallurgical treatment method on a metal bath |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1665942A CN1665942A (en) | 2005-09-07 |
| CN1665942B true CN1665942B (en) | 2011-05-11 |
Family
ID=29580011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN038153289A Expired - Fee Related CN1665942B (en) | 2002-05-24 | 2003-05-21 | Metallurgical treatment method on a metal bath |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP1507876B1 (en) |
| JP (1) | JP4405381B2 (en) |
| KR (1) | KR100926321B1 (en) |
| CN (1) | CN1665942B (en) |
| AU (1) | AU2003273150B2 (en) |
| BR (1) | BR0311295B1 (en) |
| CA (1) | CA2485633A1 (en) |
| DE (1) | DE60308860T2 (en) |
| ES (1) | ES2273014T3 (en) |
| LU (1) | LU90924B1 (en) |
| RU (1) | RU2289630C2 (en) |
| WO (1) | WO2003100102A2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102115800B (en) * | 2011-01-14 | 2013-03-13 | 河北钢铁股份有限公司承德分公司 | Pollution-free production process for ferrovanadium alloy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3971655A (en) * | 1974-08-21 | 1976-07-27 | Nippon Steel Corporation | Method for treatment of molten steel in a ladle |
| DE2629020C2 (en) * | 1976-06-29 | 1985-06-20 | Nippon Steel Corp., Tokio/Tokyo | METHOD FOR ENTPHOSPHORNING METALS AND ALLOYS |
| EP0110809B1 (en) * | 1982-11-17 | 1988-05-25 | Arbed S.A. | Process and installation for the treatment of steel in the ladle |
| CN1294199A (en) * | 1999-11-02 | 2001-05-09 | 北京科技大学 | Technology for desulfurizing molten steel in enclosed ladle by spraying powder |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6465226A (en) * | 1987-09-04 | 1989-03-10 | Sumitomo Metal Ind | Ladle refining method |
-
2002
- 2002-05-24 LU LU90924A patent/LU90924B1/en active
-
2003
- 2003-05-21 WO PCT/EP2003/050183 patent/WO2003100102A2/en active IP Right Grant
- 2003-05-21 ES ES03740486T patent/ES2273014T3/en not_active Expired - Lifetime
- 2003-05-21 AU AU2003273150A patent/AU2003273150B2/en not_active Ceased
- 2003-05-21 JP JP2004507542A patent/JP4405381B2/en not_active Expired - Fee Related
- 2003-05-21 CA CA002485633A patent/CA2485633A1/en not_active Abandoned
- 2003-05-21 DE DE60308860T patent/DE60308860T2/en not_active Expired - Fee Related
- 2003-05-21 EP EP03740486A patent/EP1507876B1/en not_active Expired - Lifetime
- 2003-05-21 RU RU2004138075/02A patent/RU2289630C2/en not_active IP Right Cessation
- 2003-05-21 BR BRPI0311295-0A patent/BR0311295B1/en not_active IP Right Cessation
- 2003-05-21 CN CN038153289A patent/CN1665942B/en not_active Expired - Fee Related
- 2003-05-21 KR KR1020047018997A patent/KR100926321B1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3971655A (en) * | 1974-08-21 | 1976-07-27 | Nippon Steel Corporation | Method for treatment of molten steel in a ladle |
| DE2629020C2 (en) * | 1976-06-29 | 1985-06-20 | Nippon Steel Corp., Tokio/Tokyo | METHOD FOR ENTPHOSPHORNING METALS AND ALLOYS |
| EP0110809B1 (en) * | 1982-11-17 | 1988-05-25 | Arbed S.A. | Process and installation for the treatment of steel in the ladle |
| CN1294199A (en) * | 1999-11-02 | 2001-05-09 | 北京科技大学 | Technology for desulfurizing molten steel in enclosed ladle by spraying powder |
Also Published As
| Publication number | Publication date |
|---|---|
| RU2004138075A (en) | 2006-01-20 |
| AU2003273150B2 (en) | 2009-01-08 |
| ES2273014T3 (en) | 2007-05-01 |
| LU90924B1 (en) | 2003-11-25 |
| BR0311295A (en) | 2005-04-19 |
| JP2005531687A (en) | 2005-10-20 |
| WO2003100102A2 (en) | 2003-12-04 |
| BR0311295B1 (en) | 2012-07-10 |
| JP4405381B2 (en) | 2010-01-27 |
| WO2003100102A3 (en) | 2004-02-26 |
| EP1507876A2 (en) | 2005-02-23 |
| KR20040106583A (en) | 2004-12-17 |
| DE60308860T2 (en) | 2007-02-22 |
| CA2485633A1 (en) | 2003-12-04 |
| EP1507876B1 (en) | 2006-10-04 |
| DE60308860D1 (en) | 2006-11-16 |
| CN1665942A (en) | 2005-09-07 |
| AU2003273150A1 (en) | 2003-12-12 |
| KR100926321B1 (en) | 2009-11-12 |
| RU2289630C2 (en) | 2006-12-20 |
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