CN102959095A - Process for producing molten steel using particulate metallic iron - Google Patents
Process for producing molten steel using particulate metallic iron Download PDFInfo
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- CN102959095A CN102959095A CN2011800308731A CN201180030873A CN102959095A CN 102959095 A CN102959095 A CN 102959095A CN 2011800308731 A CN2011800308731 A CN 2011800308731A CN 201180030873 A CN201180030873 A CN 201180030873A CN 102959095 A CN102959095 A CN 102959095A
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- granulated metal
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/5252—Manufacture of steel in electric furnaces in an electrically heated multi-chamber furnace, a combination of electric furnaces or an electric furnace arranged for associated working with a non electric furnace
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/244—Binding; Briquetting ; Granulating with binders organic
- C22B1/245—Binding; Briquetting ; Granulating with binders organic with carbonaceous material for the production of coked agglomerates
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing 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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- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacture Of Iron (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
A process for producing a molten steel (G) is disclosed in which particulate metallic iron can be more efficiently melted. The process includes the step of melting, in an electric arc furnace (2), all charge for iron which comprises: particulate metallic iron (A) produced by a method including a step in which a feed material comprising a carbonaceous reducing material and an iron oxide-containing substance is heated in a rotary hearth furnace (1) as a reducing/melting furnace and the iron oxide contained in the feed material is thereby reduced in the solid state to yield metallic iron and a step in which the resultant metallic iron is heated to a higher temperature to melt the metallic iron and the molten iron is aggregated while separating the iron from the slag (B); and scraps (D) which are another feed material for iron. The process is characterized in that the content of carbon in the particulate metallic iron (A) is regulated to 1.0-4.5 mass% and the carbon in the particulate metallic iron (A) is burned by oxygen blowing. The process is further characterized in that the particulate metallic iron (A) is used in an amount of 40-80 mass% with respect to all charge for iron and that the scraps (D) are initially introduced into the electric arc furnace (2) to obtain molten iron (F) and then the particulate metallic iron (A) is continuously introduced into the molten iron (F).
Description
Technical field
The method that the present invention relates to utilize the electric arc furnace melting by the granulated metal iron of the reducing and smelting stove manufacturing of rotary hearth furnace etc. and make molten steel.
Background technology
In the steel-making arc stove, the method for always taking is, the iron material of steel scrap, cast iron (pig iron), reduced iron etc. is packed in the stove with scraper bowl from the stove in batches, opens bell after the melting, appends the described iron material of packing into, in addition the method for melting in batches.Therefore, open and between iron material packs into, just produced thermosteresis and the loss of time at bell, and a large amount of dust problem that such operating environment worsens outside stove of dispersing.
As its countermeasure, (for example can carry out the continuous input of composition and the more uniform reduced iron of size, with reference to patent documentation 1～3), but because reduced iron contains gangue content and unreduced ferric oxide, so there is the problem of comparing steel scrap and cast iron (pig iron) and needing in a large number the melting energy.
On the other hand, in cast iron (pig iron), for the problem on making, existence can not subtract undersized restriction, and a large amount of inputs by continuous input is carried out can not realize melting.
In addition, rise to purpose and establish additional oxygen behaviour industry with the productivity of steel-making arc stove, the oxygen usage quantity also increases, and also increases with the usage quantity that drops into the corresponding carbon source of oxygen amount.
As this carbon source, use that carbon in iron liquid and the pig iron divides, block coke, coke powder etc.
Yet the problem that exists when using iron liquid is, needs the dedicated manufacturing equipment of iron liquid and to the special-purpose load facility of electric arc furnace at the upstream side of steel-making arc stove.
On the other hand, when using pig iron, as above-mentioned, because its size is large, pack in addition melting spended time, so the problem that has usage quantity to be restricted into so be limited in batches.
In addition, when using block coke, coke powder, usage quantity is subject to total sulphur content and ash composition restriction, and it is being caught by slag when electric arc furnace is packed into or outside waste gas is discharged to stove, the problems such as the Efficiency Decreasing of interpolation is being arranged.
At this, (for example disclose a kind of method, with reference to patent documentation 4,5), to be the raw material that will contain carbonaceous reduction material and contain iron oxide material heat in the reducing and smelting stove of rotary hearth furnace etc. for it, after the ferric oxide in this raw material is carried out solid reduction, reheat the metallic iron that generates and make it melting, while and make it to separate with slag composition and make it aggegation, highly purified granulated metal iron made thus.
If this granulated metal iron compares with reduced iron, then because can remove in advance slag composition, and can improve carbon content, so what can expect is, substitute reduced iron by the electric arc furnace of packing into continuously, can with oxygen blowing and with and significantly reduce melting energy in the electric arc furnace and the productivity of raising molten steel.
But, in the steel-making arc stove, about such granulated metal iron of packing into continuously, carry out more expeditiously the technology of melting and not yet establish.
The look-ahead technique document
[patent documentation]
Patent documentation 1: Japanese kokai publication sho 50-64111 communique
Patent documentation 2: Japanese kokai publication sho 51-65007 communique
Patent documentation 3: Japanese kokai publication sho 58-141314 communique
Patent documentation 4: TOHKEMY 2002-339009 communique
Patent documentation 5: TOHKEMY 2003-73722 communique
Summary of the invention
Therefore, its purpose of the present invention is, a kind of molten steel manufacture method is provided, and when it carries out melting and make molten steel at steel-making arc stove that the granulated metal iron of the reducing and smelting stove manufacturing of rotary hearth furnace etc. is packed into continuously, can carry out more expeditiously melting.
The invention provides a kind of manufacture method of using the molten steel of following granulated metal iron.
(1) a kind of manufacture method of molten steel of the operation that comprises the whole iron materials of packing into that consisted of by granulated metal iron and other iron materials with the electric arc furnace melting, described granulated metal iron is by comprising the method manufacturing of following operation: heating contains carbonaceous reduction material and the raw material that contains iron oxide material in the reducing and smelting stove, carry out solid reduction for the ferric oxide in this raw material, generate the operation of metallic iron; Further heat the metallic iron that generates and make it melting, while and make it to separate the operation that makes it aggegation with slag composition, in the manufacture method of the molten steel that has used granulated metal iron,
The content that makes the carbon in the described granulated metal iron is 1.0～4.5 quality %, by blowing and usefulness with oxygen, makes the carbon burning in the described granulated metal iron,
Described granulated metal iron is 40～80 quality % with respect to the usage ratio of the described iron material of all packing into, with initially pack into described electric arc furnace and after making molten iron of described other iron material, the described granulated metal iron of packing into continuously in this molten iron.
(2) according to (1) described manufacture method, wherein, the speed of packing into that drops into the described granulated metal iron of the every 1MW of power is 40～100kg/min/MW.
(3) according to (1) or (2) described manufacture method, wherein, make described granulated metal iron pack the position in the electrode pitch circle on the molten iron surface.
(4) according to each described manufacture method in (1)～(3), wherein, the median size that makes described granulated metal iron is 1～50mm.
(5) according to each described manufacture method in (1)～(4), wherein, formed molten slag layer on the described molten iron is bubbled and be capped all the time the lower end of electrode, Yi Bian the described granulated metal iron of packing into continuously in the described molten iron.
(6) according to each described manufacture method in (1)～(5), wherein, do not allow the granulated metal iron by the manufacturing of described reducing and smelting stove be cooled to normal temperature, but in the molten iron with 400～700 ℃ of described electric arc furnace of packing into continuously.
According to the present invention, by making by reducing and smelting stove granulated metal irons that make, carbon content 1.0～4.5 quality % and oxygen blowing and using, make the carbon burning in the described granulated metal iron, and iron material uses 40～80 quality % with respect to all packing into, in the molten iron of initially packing its iron material of making other of packing into continuously into electric arc furnace and making, thereby can realize the melting energy significantly to reduce and the Energy efficiency of electric arc furnace is risen, and the productivity of molten steel is significantly improved.
Description of drawings
Fig. 1 is the schema that the summary of the molten steel producing apparatus of expression embodiments of the present invention consists of.
Fig. 2 is that granulated metal iron is with respect to the graph of the relation of the usage ratio of the iron material of all packing into and melting energy in the expression electric arc furnace.
Fig. 3 is that granulated metal iron is with respect to the graph of the relation of the usage ratio of the iron material of all packing into and molten steel production rate in the expression electric arc furnace.
Fig. 4 is the partial longitudinal section that the summary of expression fusion test device consists of.
Fig. 5 is in the expression fusion test device, the graph of the relation of pack into speed and the input power of granulated metal iron and reduced iron.
Embodiment
Below, be described in detail based on the mode of accompanying drawing for enforcement of the present invention.
[embodiment 1]
The summary of the molten steel producing apparatus of expression one embodiment of the present invention consists of among Fig. 1.The equipment of present embodiment is as the rotary hearth furnace 1 of reducing and smelting stove and electric arc furnace 2 example when arranging.
Then, employed granulated metal iron A among the present invention for example makes as follows.
The raw material briquetting that contains iron oxide material of the carbonaceous reduction material that at first, will contain coal etc. and iron ore etc. becomes pelletizing or agglomerate.Then, this briquetting thing is loaded on the not shown siege that is equipped with raw material of wood-charcoal C, in rotary hearth furnace 1, be heated to for example about 1350～1400 ℃, after ferric oxide in the raw material carried out solid reduction, again the metallic iron that generates is heated to about 1400～1550 ℃ and makes it melting, while and make it to separate with slag composition and make it aggegation.Thereafter, the cooling end in stove is cooled to about 1000～1100 ℃, the granulated metal iron A that obtains solidifying and the mixture of slag B.Then, make this mixture remove slag B and lay raw material of wood-charcoal C with laying raw material of wood-charcoal C after rotary hearth furnace 1 is discharged, using mesh screen 3 to separate with magnetic separator 4, obtain granulated metal iron A (for example, with reference to above-mentioned patent documentation 1～3.Its content this with reference to and quote).
Carbon content among this granulated metal iron A is 1.0～4.5 quality %.Why making the lower 1.0 quality % that are limited to of carbon content, is to measure in order to ensure all kinds of corresponding required C with the steel of making, and improves the versatility as iron material.On the other hand, why make carbon content on be limited to 4.5 quality %, be to use for the load of the additional processing that do not increase the weight of carbonization treatment etc.The preferable range of the carbon content among the granulated metal iron A is 1.5～3.5 quality %.Carbon content among the granulated metal iron A, allotment amount that can be by regulating the carbonaceous reduction material in the above-mentioned briquetting thing and the atmosphere in the rotary hearth furnace 1 and adjust at an easy rate.
At this, when rotary hearth furnace 1 interior granulated metal iron A was in molten state, the carbon among this granulated metal iron A was gathered in the surperficial neighborhood of this granulated metal iron A easily, and the granulated metal iron A after therefore solidifying is the closer to its surperficial neighborhood, and carbon concentration is higher.Therefore, the granulated metal iron A that packs among the molten iron F of electric arc furnace 2 begins melting from the high low-melting surperficial neighborhood of carbon concentration easily.Carbon in the high carbon concentration molten iron of this melting by blowing and usefulness with oxygen, that is, is blown into oxygen in electric arc furnace 2, by this oxygen burning, and under this combustion heat, the also easily melting of dystectic part that the carbon concentration of granulated metal iron A inside is low.
This granulated metal iron A and the steel scrap D of iron material as other are combined as the iron material of all packing into, and this granulated metal iron A is 40～80 quality % with respect to the usage ratio of the iron material of all packing into.
Then, the electric arc furnace 2 of at first steel scrap D initial (in batches packing into) being packed into carries out electric-arc heating and molten iron F is made in melting with electrode 7.
Thereafter, proceed electric-arc heating on one side, while being blown into oxygen (being blown into again as required powdered carbon), granulated metal iron A and make it melting continuously packs in this molten iron F, thereby the energy efficiency of electric arc furnace 2 is risen, the productivity of molten steel G can be improved again, molten steel G can be obtained more expeditiously.
At this, why making granulated metal iron A is 40～80 quality % with respect to the usage ratio of the iron material of all packing into, is based on following reason.
Namely, adopt electric arc furnace (inner capacities: 90t, the transformer capacity: 74MVA) be example of real-world operation, based on the usage ratio of granulated metal iron, the difference of charging method, estimate the melting needed melting energy of iron material of all packing into, and the impact that the production rate of molten steel is caused.
At this, the carbon content of granulated metal iron is 2.5 quality %.In addition, granulated metal iron " packed into " in batches and the temperature of the granulated metal iron when " packing into continuously " is normal temperature (25 ℃), the temperature of the granulated metal iron when " high temperature is packed into continuously " is 400 ℃.In addition, be altered to " packing into continuously " for granulated metal iron from " packing into " in batches, the thermosteresis of stove whenever append pack into reduce for 1 time 870Mcal (at this, 1Mcal=4.18605MJ.Together lower.), power off time 2min, the time of nodularization (ボ one リ Application グ) phase is 2min also, is shortened respectively.
The result who estimates is presented among Fig. 2 and Fig. 3.Fig. 2 represents the usage ratio based on granulated metal iron, the difference of charging method, all pack into the variation of the needed melting energy of iron material of melting.In addition, Fig. 3 represents the usage ratio based on granulated metal iron, the difference of charging method, the variation of molten steel production rate.
If the usage ratio of granulated metal iron A is lower than 40 quality %, if the usage ratio of steel scrap D of iron material as other surpasses 60 quality % in other words, the then capacity of the not shown scraper bowl restriction owing to pack in batches, just produce initially packing into of steel scrap D is divided into the needs that carry out for 2 times, as shown in Figure 3, even pack continuously granulated metal iron A into, the molten steel production rate also significantly reduces.
On the other hand, if the usage ratio of granulated metal iron A surpasses 80 quality %, then granulated metal iron A is when " high temperature is packed into continuously ", decarburization time is longer than the fusion time that the input power capacity of electric arc furnace 2 determines, because taking off the charcoal time, this carries out rate-controlling for the productivity of molten steel, so as shown in Figure 3, the rising of molten steel production rate culminates.
The result who goes up according to this, granulated metal iron A is 40～80 quality % with respect to the usage ratio of the iron material of all packing into.
In addition, drop into the speed of packing into of the granulated metal iron A of the every 1MW of power, be preferably 40～100kg/min/MW based on following reason.
That is, the melting characteristic of the granulated metal iron when packing into continuously in order to hold as the molten pig raw material, uses to have the granulated metal iron of the physical/chemical proterties shown in the following table 1 and the reduced iron of material as a comparison, enforcement fusion test.
[table 1]
As the fusion test device, consist of such as the summary that shows among Fig. 4, use by following to consist of: 500kg high frequency furnace (rated value: 350kW, 1000Hz); (hopper capacity: 200kg, raw material drop into speed to raw material feed device: 0～15kg/min); Be used for observing the monitoring camera of melting situation; Be used for the data collection device that record melt temperature and raw material drop into speed.
As melting condition, to make C:0.2～0.3 quality %, Si＜0.03 quality %, Mn:0.05 quality %, temperature: 1550 ℃ initial liquation 250kg, one side melt temperature is maintained 1550～1600 ℃ of successively feed change input speed on one side, the smooth melting of iron material of being packed into continuously by the monitoring camera affirmation on one side, adjustment input on one side power.
The result of fusion test is presented in Fig. 5 and the following table 2.
[table 2]
Shown in these charts, granulated metal iron is compared with reduced iron, and the maximum melting speed that drops into the every 1MW of power reaches its 2.5～3.0 times.
Also have, so the maximum melting speed of granulated metal iron reaches 2.5～3.0 times of maximum melting speed of reduced iron, the amount that slag composition contained in the reduced iron not only is described is more than granulated metal iron, also be considered to owing to the heating source as fusion test is not with electric-arc heating, but used high-frequency induction heating.
That is, apparent density and the molten iron of granulated metal iron are equal to substantially, the therefore state melting to float in molten iron, and molten iron is fully heated by high-frequency induction heating, so the melting speed of granulated metal iron is enough large.On the other hand, because the apparent density of reduced iron and molten slag are equal to substantially, so the state melting to float in molten slag, molten slag is different from electric-arc heating, can not fully heat under high-frequency induction heating.For this reason, think that the melting speed phase granulated metal iron of reduced iron significantly reduces.
At this, because this fusion test device is small-sized 500kg, so compare with the 90t electric arc furnace of real-world operation, its thermosteresis is more much bigger, therefore in this fusion test, obtain, the maximum melting speed of the every 1MW of input power of granulated metal iron, when using in the electric arc furnace of real-world operation, it is larger that imagination will become.Therefore, as follows, when carrying out packing continuously granulated metal iron into to the 90t electric arc furnace of real-world operation, every 1MW of granulated metal iron drops into the inferring of melting speed of power.
As described in Table 3, if try to achieve the melting power dissipation rates of the granulated metal iron of this fusion test device, the speed of then packing into is that 4kg/min obtains 714kWh/t, and the speed of packing into obtains 584kWh/t when being 7kg/min.On the other hand, in the 90t of above-mentioned real-world operation electric arc furnace, the actual value of the melting power dissipation rates because pack into continuously during reduced iron exists, so actual value for the melting power dissipation rates of this reduced iron, if consider reduced iron and granular iron composition difference and estimate the melting power dissipation rates of granulated metal iron, then can access 366kWh.Therefore, with in the 90t of above-mentioned real-world operation electric arc furnace, the input power efficiency of this fusion test device is 366/714=51.3% as shown in the table when the speed of input 4kg/min, is 366/584=62.7% when dropping into speed 7kg/min.
[table 3]
Therefore, make in this fusion test device shown in the above-mentioned table 2, the maximum melting speed [R] of the every 1MW of input power of granulated metal iron is divided by above-mentioned input power efficiency [C]/100, carry out thus revisal, infer in the 90t electric arc furnace of above-mentioned real-world operation, the maximum melting speed of the every 1MW of input power of granulated metal iron (the above-mentioned table 2 of reference " the maximum melting speed after the revisal " hurdle).
Gather the above-mentioned result of inferring and be presented at " packing into continuously " in the hurdle of following table 4.In addition, the result who also records in the lump in table has, the carbon content that makes granulated metal iron is 2.5 quality %, when making this contained carbon burning give energy by being blown into oxygen, respectively for the situation of the granulated metal iron of packing into 600 ℃ of high temperature, estimate the power dissipation rates of the 90t electric arc furnace of above-mentioned real-world operation, infer the maximum melting speed of the every 1MW of input power of granulated metal iron.
[table 4]
By inferring the result as can be known shown in the above-mentioned table 4, the maximum melting speed of the every 1MW of input power of granulated metal iron according to the carbon content of this granulated metal iron and the temperature change of packing into, is in the scope of 40～100kg/min/MW.Therefore, drop into the speed of packing into of the granulated metal iron A of the every 1MW of power, be recommended as 40～100kg/min/MW.
In addition, granulated metal iron A packs location optimization in the electrode pitch circle at molten iron F face.
That is, existing reduced iron, as above-mentioned, because its apparent density and molten slag are equal to substantially, so drop into reduced iron in the liquation of electric arc furnace, can be in molten slag layer the long time be detained, via molten slag layer, under electric-arc heating, carry out melting.Therefore, the position of packing into for reduced iron does not restrict especially.
With respect to this, granulated metal iron A of the present invention is because its apparent density and molten iron F are equal to substantially, so granulated metal iron A in the liquation of input electric arc furnace 2, can penetrate molten slag layer E and slip among the molten iron layer F, via molten slag layer E and molten iron layer F, under electric-arc heating, carry out melting.Therefore, then not enough to the heat transfer of granulated metal iron A if granulated metal iron A is packed into away from the position of electrode 7, be created in and accumulate the residual possibility of granulated metal iron A melting among the molten iron layer F.Therefore, granulated metal iron A is in the position of packing into of molten iron F face, and special recommendation so that arc heat is more direct, be transmitted to expeditiously granulated metal iron A, prevents that melting is residual thus in the electrode pitch circle, and the productivity of molten steel G further improves.
In addition, the median size of granulated metal iron A is preferably 1～50mm.
This is owing to there is following possibility: if the undersized of granulated metal iron A, after then discharging from rotary hearth furnace 1, sneak into easily fine slag composition when reclaiming respectively, iron divides purity drop, perhaps when electric arc furnace 2 is packed into, disperse easily, add Efficiency Decreasing.On the other hand, if the granularity of granulated metal iron A is excessive, when then being made by rotary hearth furnace 1, it is time-consuming to the inside of above-mentioned briquetting thing to conduct heat, and productivity losing is perhaps in the stove elevating hopper 6 and stopping up with hopper 6 peristomes, when perhaps carrying out melting with electric arc furnace 2, the melting Speed Reduction.The preferred median size of granulated metal iron A is 2～25mm.
In the present invention, so-called median size, carry out classification with method of sieving exactly after, the mass median diameter that goes out according to the representative diameter between each sieve aperture and the Mass Calculation between this sieve aperture.For example, use sieve aperture to be D1, D2 ..., D
n, D
N+1(D
1＜D
2＜...＜D
n＜D
N+1) sieve when carrying out classification, sieve aperture D
kAnd D
K+1Between quality be W
kThe time, mass median diameter d
mBy d
m=∑
K=1, n(W
k* d
k)/∑
k=
1, n(W
k) definition.At this, d
kSieve aperture D
kAnd D
K+1Between the representative diameter, d
k=(D
k+ D
K+1)/2.
In addition, when in the molten iron F of electric arc furnace 2, packing continuously granulated metal iron A into, preferably make the upper formed molten slag layer E foaming of molten iron layer F on one side and the lower end of covering electrodes 7 all the time, Yi Bian carry out melting.Thus, the heat of electric arc can be discharged into upper space, and can make it to be transmitted to more efficiently molten iron layer F, the melting speed of granulated metal iron A further improves.The height of the foaming of molten slag layer E for example can be by being blown into oxygen in molten iron layer F, the decarburizing reaction by the carbon among the molten iron layer F makes CO gas generate to adjust.
In addition, preferred the granulated metal iron A of rotary hearth furnace 1 manufacturing is not cooled to normal temperature, but packs into continuously among the molten iron F of electric arc furnace 2 with 400～700 ℃ the condition of high temperature.
Thus, can effectively utilize the sensible heat of granulated metal iron A, can reduce in addition the melting specific energy consumption of electric arc furnace 2, and the productivity (molten steel production rate) of molten steel G is improved.
Why making the OK range of the temperature of packing into of granulated metal iron A is 400～700 ℃, is based on following reason.Namely, viewpoint from effective utilization of the sensible heat of granulated metal iron A, need temperature to a certain degree, making thus lower limit temperature is 400 ℃, when separating with laying raw material of wood-charcoal C with slag composition B for granulated metal iron A by magnetic separation, need to make granulated metal iron A magnetization, therefore making ceiling temperature is low 700 ℃ of Curie temperature (770 ℃) than iron.
Because with the condition of high temperature with the granulated metal iron A electric arc furnace 2 of packing into; so; for the mesh screen 3 of protecting back segment; magnetic separator 4; the equipment of travelling belt 5 grades; and about 1000～1100 ℃ the granulated metal iron A and the slag B that discharge from rotary hearth furnace 1 are cooled off a little with the mixture of laying raw material of wood-charcoal C; mesh screen 3 and magnetic separator 4 Separation and Recovery granulated metal iron A that reinstate the pyrometric gage lattice more afterwards; travelling belt 5 by the high temperature specification is once stored this granulated metal iron A conveyance to the stove elevating hopper 6 of electric arc furnace 2, and the temperature during from this stove elevating hopper 6 opening is 400～700 ℃ and gets final product.Also have, be used for discharging the discharge line of said mixture to the stove elevating hopper 6 of electric arc furnace 2 from rotary hearth furnace 1, directly contact and reoxidize with atmosphere in order to prevent granulated metal iron A, can be blown in advance N
2Deng and form inert gas atmosphere.
(variation)
In the above-described embodiment, as the stove form illustration of reducing and smelting stove rotary hearth furnace, but also can use straight line furnace.
In addition, in the above-described embodiment, as containing carbonaceous reduction material and contain the raw material of iron oxide material, illustratively be for carbonaceous reduction material and contain iron oxide material and carry out the briquetting thing that briquetting forms, but also can not carry out briquetting, but under the state of powdery, use them.
In addition, in the above-described embodiment, as the carrying device illustration of the granulated metal iron of the condition of high temperature travelling belt of high temperature specification, but also can transfer with transportation vehicle and crane etc. the container of insulation.
In addition, in the above-described embodiment, illustrative is the close situation about arranging of rotary hearth furnace and electric arc furnace, but rotary hearth furnace separates with electric arc furnace and arranges when inner, if the granulated metal iron of rotary hearth furnace manufacturing is cooled to normal temperature, then solidify after the melting of granulated metal iron, therefore than reduced iron densification, needn't adopt thus and reoxidize especially anti-locking mechanism, use common transfer mechanism just can be delivered to electric arc furnace.
In addition, in the above-described embodiment, as other the iron material of initially packing into to electric arc furnace, illustrative is steel scrap, but also can use reduced iron or granulated metal iron, may be used also that they are two or more.
Also have, when using granulated metal iron as other all or part of of iron material of initially packing into to electric arc furnace, the granulated metal iron of packing into continuously in the made molten iron of the iron material of other of initially packing into to this need to be in 40～80 quality % with respect to the usage ratio of the iron material of all packing into.In other words, exactly as initially pack into to electric arc furnace other iron material all or part of and when using granulated metal iron, wholegrain shape metallic iron is with respect to the usage ratio of the iron material of all packing into, become the ratio that initial Intake Quantity and continuous Intake Quantity add up to, therefore there is the possibility that is in the usage ratio higher than 40～80 quality %, therefore need to makes the ratio of this total be adjusted into 40～80 quality %.
In detail and with reference to specific embodiment the application has been described, but can broken away from the spirit and scope of the present invention and in addition various changes and correction, this is very clear concerning the practitioner.
The application is based on the Japanese patent application (patent application 2010-146114) of on June 28th, 2010 application, its content this with reference to and quote.
[utilizability on the industry]
According to the present invention, by making by reducing and smelting stove granulated metal irons that make, carbon content 1.0～4.5 quality % and oxygen blowing and using, make the carbon burning in the described granulated metal iron, and iron material uses 40～80 quality % with respect to all packing into, in its molten iron of other iron material initially being packed into electric arc furnace and making of packing into continuously, thereby can realize significantly reducing the melting energy and make the energy efficiency rising of electric arc furnace, and the productivity of molten steel is significantly improved.
Nomenclature
1 ... fusion reducing furnace (rotary hearth furnace)
2 ... electric arc furnace
3 ... mesh screen
4 ... magnetic separator
5 ... travelling belt
6 ... the stove elevating hopper
7 ... electrode
A ... granulated metal iron
B ... slag
C ... the deposited raw material of wood-charcoal of bed
D ... his iron material (steel scrap)
E ... molten slag, molten slag layer
F ... molten iron, the molten iron layer
G ... molten steel
Claims (17)
1. manufacture method of using the molten steel of granulated metal iron, it is characterized in that, to comprise the manufacture method of molten steel of operation that contains whole iron materials of packing into of granulated metal iron and other iron materials with the electric arc furnace melting, described granulated metal iron forms by the method manufacturing that comprises following operation: heating contains carbonaceous reduction material and contains the raw material of iron oxide material in the reducing and smelting stove, and the ferric oxide in this raw material is carried out solid reduction and generates the operation of metallic iron; Further the metallic iron that generates of heating makes this metallic iron melting, while and make this metallic iron separate the operation that makes this metallic iron aggegation with slag composition, in the manufacture method of the molten steel of described use granulated metal iron,
The content of the carbon in the described granulated metal iron is 1.0～4.5 quality %, by blowing and usefulness with oxygen, makes the carbon burning in the described granulated metal iron,
And described granulated metal iron is 40～80 quality % with respect to the usage ratio of the described iron material of all packing into, described other iron materials is initially packed after described electric arc furnace makes molten iron into the described granulated metal iron of packing into continuously in this molten iron.
2. manufacture method according to claim 1, wherein, the speed of packing into that drops into the described granulated metal iron of the every 1MW of power is 40～100kg/min/MW.
3. manufacture method according to claim 1, wherein, described granulated metal iron is packed the position in the electrode pitch circle the molten iron surface.
4. manufacture method according to claim 2, wherein, described granulated metal iron is packed the position in the electrode pitch circle the molten iron surface.
5. manufacture method according to claim 1, wherein, the median size of described granulated metal iron is 1～50mm.
6. manufacture method according to claim 2, wherein, the median size of described granulated metal iron is 1～50mm.
7. manufacture method according to claim 3, wherein, the median size of described granulated metal iron is 1～50mm.
8. manufacture method according to claim 4, wherein, the median size of described granulated metal iron is 1～50mm.
9. manufacture method according to claim 1 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
10. manufacture method according to claim 2 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
11. manufacture method according to claim 3 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
12. manufacture method according to claim 4 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
13. manufacture method according to claim 5 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
14. manufacture method according to claim 6 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
15. manufacture method according to claim 7 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
16. manufacture method according to claim 8 wherein, makes on the described molten iron formed molten slag layer bubble and the lower end of covering electrodes all the time, the described granulated metal iron of packing into continuously in the described molten iron simultaneously.
17. each described manufacture method according to claim 1～16 wherein, will not be cooled to normal temperature by the granulated metal iron of described reducing and smelting stove manufacturing, but in the molten iron of 400～700 ℃ of described electric arc furnace that this granulated metal iron packed into continuously.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010146114A JP2012007225A (en) | 2010-06-28 | 2010-06-28 | Method for producing molten steel using particulate metallic iron |
| JP2010-146114 | 2010-06-28 | ||
| PCT/JP2011/064717 WO2012002338A1 (en) | 2010-06-28 | 2011-06-27 | Process for producing molten steel using particulate metallic iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102959095A true CN102959095A (en) | 2013-03-06 |
Family
ID=45402046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800308731A Pending CN102959095A (en) | 2010-06-28 | 2011-06-27 | Process for producing molten steel using particulate metallic iron |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US20130098202A1 (en) |
| JP (1) | JP2012007225A (en) |
| CN (1) | CN102959095A (en) |
| AU (1) | AU2011271929A1 (en) |
| CA (1) | CA2801606A1 (en) |
| RU (1) | RU2013103510A (en) |
| TW (1) | TW201215682A (en) |
| WO (1) | WO2012002338A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI698532B (en) * | 2018-04-17 | 2020-07-11 | 日商日本製鐵股份有限公司 | Method for manufacturing molten steel |
| CN115485397A (en) * | 2020-04-30 | 2022-12-16 | Sms集团有限公司 | Method for producing liquid pig iron from DRI products |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014043645A (en) * | 2012-08-03 | 2014-03-13 | Kobe Steel Ltd | Process of producing metallic iron |
| CN102787196B (en) * | 2012-08-24 | 2013-10-16 | 北京首钢国际工程技术有限公司 | Method for smelting stainless steel by direct reduced iron |
| CN102787195B (en) * | 2012-08-24 | 2013-10-16 | 北京首钢国际工程技术有限公司 | Stainless-steel smelting method |
| CN102925610A (en) * | 2012-10-22 | 2013-02-13 | 西安桃园冶金设备工程有限公司 | Electricity-coal process melting and reduction ironmaking technology |
| WO2014126495A1 (en) * | 2013-02-13 | 2014-08-21 | Siemens Aktiengesellschaft | Apparatus and method for automatic controlling direct reduction process of iron oxide containing material |
| FI127179B (en) * | 2015-09-15 | 2017-12-29 | Outotec Finland Oy | METHOD AND ORGANIZATION FOR MONITORING THE FEATURES PROPERTIES AND PROCESS MONITORING UNIT |
| JP7094259B2 (en) * | 2019-11-21 | 2022-07-01 | 株式会社神戸製鋼所 | Manufacturing method of molten steel |
| JP7094264B2 (en) * | 2019-12-25 | 2022-07-01 | 株式会社神戸製鋼所 | Manufacturing method of molten steel |
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- 2011-06-27 AU AU2011271929A patent/AU2011271929A1/en not_active Abandoned
- 2011-06-27 CA CA 2801606 patent/CA2801606A1/en not_active Abandoned
- 2011-06-27 WO PCT/JP2011/064717 patent/WO2012002338A1/en active Application Filing
- 2011-06-27 RU RU2013103510/02A patent/RU2013103510A/en not_active Application Discontinuation
- 2011-06-27 US US13/807,442 patent/US20130098202A1/en not_active Abandoned
- 2011-06-28 TW TW100122588A patent/TW201215682A/en unknown
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| CN1383453A (en) * | 2000-03-30 | 2002-12-04 | 米德雷克斯国际公司苏黎世分公司 | Method of producing metallic iron and raw material feed device |
| CN1763231A (en) * | 2000-03-30 | 2006-04-26 | 米德雷克斯国际公司苏黎世分公司 | Method of producing metallic iron |
| JP2002327211A (en) * | 2001-04-26 | 2002-11-15 | Nkk Corp | Method for melting cold iron source |
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| CN115485397A (en) * | 2020-04-30 | 2022-12-16 | Sms集团有限公司 | Method for producing liquid pig iron from DRI products |
Also Published As
| Publication number | Publication date |
|---|---|
| US20130098202A1 (en) | 2013-04-25 |
| RU2013103510A (en) | 2014-08-10 |
| WO2012002338A1 (en) | 2012-01-05 |
| AU2011271929A1 (en) | 2013-01-10 |
| CA2801606A1 (en) | 2012-01-05 |
| AU2011271929A9 (en) | 2013-07-25 |
| TW201215682A (en) | 2012-04-16 |
| JP2012007225A (en) | 2012-01-12 |
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