CN107119166B - A kind of biomass iron content agglomerate mini-mill steelmaking and the method for producing stainless steel - Google Patents
A kind of biomass iron content agglomerate mini-mill steelmaking and the method for producing stainless steel Download PDFInfo
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- CN107119166B CN107119166B CN201710355355.6A CN201710355355A CN107119166B CN 107119166 B CN107119166 B CN 107119166B CN 201710355355 A CN201710355355 A CN 201710355355A CN 107119166 B CN107119166 B CN 107119166B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
-
- 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
- C21C5/005—Manufacture of stainless steel
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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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
Abstract
A kind of biomass iron content agglomerate mini-mill steelmaking of the invention and the method for producing stainless steel, belong to technical field of ferrous metallurgy.Method for making steel step 1 of the invention: iron content agglomerate is put into elevated temperature vessel and heats, ferriferous oxide is reduced generation direct reduced iron by production direct reduced iron；Step 2: direct reduced iron hot charging is sent into electric furnace, and slag former is added into electric furnace by electro-smelting, taps after oxygen blast melting；The method of stainless steel of the invention is above-mentioned molten steel to be added to decarburization heating in AOD furnace, then the raw metal containing chromium is added into furnace and carries out alloying, then molten steel is transported in VOD furnace and carries out deep decarburization, obtains stainless steel.The present invention generates direct reduced iron by restoring iron content agglomerate, then melting in electric furnace is sent into direct reduced iron hot charging and obtains qualified molten steel, realizes the mini-mill steelmaking of biomass iron content agglomerate, improves efficiency of energy utilization；Production stainless steel may further be smelted.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, refine more specifically to a kind of biomass iron content agglomerate short route
Steel and the method for producing stainless steel.
Background technique
Direct-reduction is ferriferous oxide in non-fusible, not slag making, is reduced to the technique of metallic iron in the solid state.Direct-reduction
Product is referred to as direct reduced iron (Direct Reduction Iron, be abbreviated as DRI), and direct-reduction is to have realized on a large scale
Industrialized processing technique has realized that the direct-reduction process of industrialized production has 10 kinds of number.World direct reduced iron (DRI/ in 2008
HBI about 68,450,000 t of yield), about the 7.23% of 9.30 hundred million t of WORLD PIG IRON PRODUCTION.Direct reduced iron is since product is pure, matter
Amount is stablized, metallurgy characteristic is excellent, becomes the high-quality steel of production, the indispensable raw material of clean steel, is that world steel market is most well sold and in short supply
One of commodity, direct-reduction is an indispensable component part of world steel production.
The steel accumulation in China is insufficient, and for steel scrap yield far from the needs for meeting steel production, steel scrap shortage is shadow
An important factor for ringing China's electric steel development；The main energy sources of China Steel production simultaneously are coke, worldwide coking coal resource
Shortage, the serious interference of rapid rise of price and the sustainable development that threaten China's steel industry.Development of Direct-Reduced Iron directly refines
Steel is conducive to improve the energy resource structure of steel production in China, gets rid of yoke of the coking coal resource to development, is to reduce steel production pair
The dysgenic important channel of environment.The energy-saving and emission-reduction policy of steel and iron industry is promoted, energy-saving and emission-reduction dynamics is increased, improves the energy
Utilization efficiency develops " low-carbon economy " based on low energy consumption, low pollution, could promote the sustainable development of steel and iron industry.
Biomass energy (biomass energy) is the form of energy that solar energy is stored in biomass in the form of chemical energy,
I.e. using biomass as the energy of carrier.It directly or indirectly derives from the photosynthesis of green plants, is a kind of renewable energy
Source.Biomass energy has many advantages, such as renewable, low pollution, widely distributed.Biomass energy is rationally utilized, can be effectively reduced to mine
The dependence of the object energy is polluted by mitigating energy-consuming to caused by environment.Nowadays the development and utilization of biomass energy at
For the focus of international concern, Biomass Energy Technology has suitable vast potential for future development.Process of the existing biomass in application
In, often gasify to biomass, gasification of biomass be under certain thermodynamic condition, by means of air part (or
Oxygen), the effect of vapor, make the high polymer of biomass that pyrolysis, oxidation, reduction reforming reaction occur, be eventually converted into an oxygen
Change carbon, the process of the fuel gas such as hydrogen and low molecular hydrocarbon.Therefore, biomass can be applied in steel and iron industry, is utilized
Biomass replaces the coal and coke of traditional iron-smelting process.Urgent need is developed a kind of using biomass progress iron content agglomerate smelting
The mini-mill steelmaking method of refining improves efficiency of energy utilization, and realize to be the adverse effect for reducing steel production to environment
Sustainable development.
It is retrieved, has the research of relevant technical staff's development in this respect, such as: a kind of electromagnetic heating carbonaceous pelletizing company
Continuous direct steelmaking method (application number: 201510465009.4 applyings date: 2015-07-29), the electromagnetic heating of the program is carbon containing
The continuous direct steelmaking method of pelletizing the steps include: the preheating of carbonaceous pelletizing, the formation in steel bath molten bath, the prereduction of carbonaceous pelletizing
With molten point of reaction of slag iron, by using the technical solution in the present invention, can smelter iron, steel-making be integrated, pass through control and be added
Carbonaceous pelletizing in C/O molar ratio, realize the control to [C] content in molten steel, being not required to carry out blowing can be directly by containing
Carbon pellets produce qualified high-quality molten steel, and capacity usage ratio is high, and high production efficiency realizes continuous steelmaking, and capital construction cost
It is substantially saved with equipment investment.But still it is difficult to realize the mini-mill steelmaking of biomass iron content agglomerate.In addition, such as invention wound
The title made are as follows: a kind of direct steel making process for iron ore (application number: 200810139695.6 applyings date: 2008-09-04), it should
First iron ore or prereduction miberal powder are added in slag iron bath for method, and iron ore or prereduction miberal powder are dissolved into slag, directly also with carbon
Stoste state ferriferous oxide, by controlling the oxidisability of slag and iron bath, obtaining carbon and contain to slag iron molten bath slag area and the oxygen blast of molten iron area
Measure the molten steel less than 1.3%.This solution provides productivity, ton steel carbon consumption are low, but it is still difficult to realize biomass iron content group
The mini-mill steelmaking of block.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome in the prior art, the short stream of biomass iron content agglomerate is not yet realized in the prior art
The problem of journey is made steel, a kind of method that biomass iron content agglomerate mini-mill steelmaking is provided and produces stainless steel；
A kind of biomass iron content agglomerate mini-mill steelmaking method wherein provided is made by restoring biomass iron content agglomerate
Direct reduced iron is obtained, then melting in electric furnace is sent into direct reduced iron hot charging and obtains qualified molten steel, realizes biomass iron content group
The mini-mill steelmaking of block；Further, it can produce imflammable gas during producing direct reduced iron, and reduce tar and contain
Amount, while improving gasifyin g yield；
The method of a kind of biomass iron content agglomerate short route production stainless steel wherein provided, by by biomass iron content group
Block, which restores, is made direct reduced iron, then melting obtains qualified molten steel, and AOD, VOD refine to obtain stainless steel, biomass iron content agglomerate
Short route smelting stainless steel；Further, it can produce imflammable gas during producing direct reduced iron, and reduce coke
Oil content, while improving gasifyin g yield.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of biomass iron content agglomerate mini-mill steelmaking method of the invention,
Step 1: production direct reduced iron
Biomass, iron-bearing material and additive are mixed to pressurize, iron content agglomerate is made, iron content agglomerate is put into elevated temperature vessel
In heated, ferriferous oxide is reduced generation direct reduced iron, and the additive includes sodium carbonate, lateritic nickel ore, white clouds
Stone and plant ash；
Step 2: electro-smelting
Direct reduced iron hot charging is sent into electric furnace, and slag former is added into electric furnace, is tapped after oxygen blast melting.
Preferably, the biomass, which immerses in modified solution, is modified processing, then by after modification biomass,
Iron-bearing material and additive mixing, which are pressurizeed, is made iron content agglomerate, and the temperature that modified solution is modified processing to biomass is 80-
95℃。
Preferably, the modified solution is alkaline solution.
Preferably, the modified solution is NaOH, Ca (OH)2, one of KOH or two or more combinations.
Preferably, FeO content is 12~20% in electro-smelting heat of oxidation clinker, dual alkalinity R=2~3.
Preferably, step 1: specific step is as follows for production direct reduced iron:
(1) biomass is immersed in modified solution and impregnates 1-2h, dried in an oven after the completion of impregnating, complete biomass
It is modified；
(2) biomass, iron-bearing material, additive are mixed, iron content is prepared in 150-400 DEG C of hot pressing by cuber
Agglomerate；
(3) the iron content agglomerate after drying is put into 800-900 DEG C of elevated temperature vessel, keeps 5-10min, then be warming up to
1150-1250 DEG C, and keep the temperature 30-60min.
Preferably, the iron-bearing material, biomass and additive are formed by following mass fraction:
50-60 parts of biomass；
100-200 parts of iron-bearing material；
5-10 parts of additive.
Preferably, the sodium carbonate, lateritic nickel ore, dolomite and 200 mesh percent of pass of vegetation ash particle are greater than 90%.
The method of a kind of biomass iron content agglomerate short route production stainless steel of the invention, using above-mentioned mini-mill steelmaking
Method smelts to obtain molten steel, and decarburization in AOD furnace is added in molten steel and is warming up to 1650-1680 DEG C, then the gold containing chromium is added into furnace
Belong to raw material and carries out alloying；The molten steel after alloying is transported in VOD furnace again and carries out deep decarburization, obtains stainless steel.
Preferably, processing of being skimmed after AOD furnace smelting completion, which is transported in VOD furnace, carries out deep decarburization, endpoint carbon content
0.02-0.04%.
3. beneficial effect
Using technical solution provided by the invention, compared with existing well-known technique, there is following remarkable result:
(1) a kind of biomass iron content agglomerate mini-mill steelmaking method of the invention is held by the way that iron content agglomerate is put into high temperature
It is heated in device, ferriferous oxide is reduced generation direct reduced iron, then melting in electric furnace is sent into direct reduced iron hot charging and is obtained
To qualified molten steel, realize the mini-mill steelmaking of biomass iron content agglomerate, using biomass replace traditional iron-smelting process coal and
Coke improves efficiency of energy utilization, and realizes sustainable development；And gasification of biomass during producing direct reduced iron
Production obtains imflammable gas, and reduces tar content, while improving gasifyin g yield；
(2) a kind of biomass iron content agglomerate mini-mill steelmaking method of the invention, biomass iron content agglomerate can be improved directly
The degree of metalization of reduced iron is connect, wherein biomass is as the reducing agent of ferriferous oxide and the source C of imflammable gas and the source H, iron
Oxide serves as the standby source of iron of steel and carbon reaction generates the oxygen source of CO, improves the degree of metalization of direct reduced iron；It is another
Aspect promotes the catalytic pyrolysis of tar and biomass decomposition product；
(3) a kind of biomass iron content agglomerate mini-mill steelmaking method of the invention, passes through modified biomass and iron-bearing material
It is hot-forming at high temperature, the intensity of iron content agglomerate is improved, the broken of iron content agglomerate is avoided, promotes the life of iron content agglomerate
Gasification substance improves the efficiency of reaction；Iron grade is further increased, and the direct-reduction of high quality has been prepared
Iron, the mini-mill steelmaking for biomass iron content agglomerate provide necessary condition, lay a good foundation to smelt qualified molten steel；
(4) method of a kind of biomass iron content agglomerate short route production stainless steel of the invention, by by biomass iron content
Agglomerate, which restores, is made direct reduced iron, then melting obtains qualified molten steel, and AOD, VOD refine to obtain stainless steel, biomass iron content group
The short route smelting stainless steel of block, the stainless steel of production have the advantage of low-carbon, low P, improve the quality of stainless steel；It smelts not
Metal ion during rust steel in iron content agglomerate is adsorbed on the table of biomass and its decomposition product in the process of high-temperature heating
Face has promoted the offset of C-C and C-O bond angle, elongated, the carbocyclic ring irregular deformation of bond distance etc., and bond energy is caused to reduce, tar and biology
Other decomposition product thermal stability of matter reduce, and can promote the decomposition of larger molecular organics, reduce tar content, improve simultaneously
Gasifyin g yield.
Detailed description of the invention
Fig. 1 is the flow chart that step one of the invention produces direct reduced iron；
Fig. 2 is a kind of flow chart of biomass iron content agglomerate mini-mill steelmaking method of the invention.
Label declaration in schematic diagram:
S100, step 1: production direct reduced iron；S110, step (1)；S120, step (2)；S130, step (3)；
S200: step 2: electro-smelting.
Specific embodiment
Hereafter to the detailed description of exemplary embodiment of the present invention with reference to attached drawing, which forms one of description
Point, it has been shown as example enforceable exemplary embodiment of the invention in the figure.Although these exemplary embodiment quilts
Sufficiently describe in detail so that those skilled in the art can implement the present invention, it is to be understood that can realize other embodiments and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to the embodiment of the present invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit pair
The description of the features of the present invention and feature to propose to execute best mode of the invention, and is sufficient to make those skilled in the art
It can implement the present invention.Therefore, the scope of the invention is only defined by the appended claims.
Hereafter detailed description of the present invention and example embodiment are more fully understood in combination with attached drawing, wherein of the invention
Element and feature are identified by appended drawing reference.
Embodiment 1
Application has been achieved for a series of breakthrough during early-stage study, and improves gasifyin g yield and direct-reduction
The quality of iron, have significant progress, and applied patent of invention (a kind of gasification of biomass of 2017101469513- and directly also
Former iron co-production and additive therefor, the applying date are as follows: 2016-03-13).It is subsequent continue research during applicant into one
Step uses the process for making of biomass iron content agglomerate short route, and good molten steel is prepared, and substantially reduces smelting iron and steel
Technical process, provide the efficiency of smelting.
Applicant carried out further furtheing investigate, creative proposing does not add binder in iron content agglomerate,
And it is hot-forming at high temperature with iron-bearing material by modified biomass, the intensity of iron content agglomerate is improved, iron content group is avoided
Being crushed for block, promotes the gasification of biomass of iron content agglomerate, improves the efficiency of reaction；Iron grade is further increased, and
The direct reduced iron of high quality has been prepared, and has provided good raw material for mini-mill steelmaking, to produce good molten steel
It lays the foundation.
In conjunction with Fig. 2, a kind of biomass iron content agglomerate mini-mill steelmaking method, steps are as follows:
S100: step 1 produces direct reduced iron,
Biomass, iron-bearing material and additive are mixed to pressurize, iron content agglomerate is made, iron content agglomerate is put into elevated temperature vessel
In heated, ferriferous oxide is reduced generation direct reduced iron, and the additive includes sodium carbonate, lateritic nickel ore, white clouds
Stone and plant ash；As shown in Figure 1, the specific steps are as follows:
S110: biomass is immersed in modified solution and impregnates 1-2h, the present embodiment 1.5h, modified solution pair by step (1)
The temperature that biomass is modified processing is 80-95 DEG C, and the present embodiment is 90 DEG C；It dries, dries in an oven after the completion of impregnating
Temperature is 105 DEG C, and granularity need to be crushed to when broken less than 80 mesh, and requires the ash content of biomass lower than 3%, completes biomass
Modification；
It is worth noting that modified solution therein is alkaline solution, the alkaline solution is NaOH solution, and NaOH is molten
The mass concentration of liquid is 2%.It is worth noting that: wherein the source of biomass includes in agriculture and forestry production process except grain fruit
The lignocellulosics such as stalk, trees in addition, farming industry leftover bits and pieces, agriculture and forestry organic waste material, industrial bio matter waste；When
Fowl and animal excrement and the waste etc. being so also possible to during Animal husbandry production.
S120: step (2) mixes iron-bearing material, biomass and additive, by cuber in 150-400 DEG C of hot pressing
Standby to obtain iron content agglomerate, the pressure of iron content agglomerate is 10-20MPa, the present embodiment 15MPa, then by agglomerate as 105 ± 5
Under conditions of DEG C, 3h is to being completely dried for heat preservation；It the iron-bearing material, biomass, additive and is formed by following mass fraction:
Biomass 50-60g, preferably 52g；Iron-bearing material 100-200g, preferably 150g；Additive 5-10g, preferably 8g.Described in wherein
Iron-bearing material includes blast furnace ash, sinter return fine and iron ore concentrate, the mass percent of each component are as follows: blast furnace ash: 5%, sinter return fine:
10%, iron ore concentrate: 85%.
Sinter return fine are as follows: it returns mine for the particulate in sintering process, blast furnace gas ash composition are as follows: blast furnace dust is blast furnace
The raw material dust that coal gas carries out, contains biological cycle, K2The mass percentage of O are as follows: 1.0~2.0%；Na2The quality hundred of O
Divide content are as follows: 5.0~9.0%.
S130: the iron content agglomerate after drying is put into 800-900 DEG C of closed elevated temperature vessel by step (3), and closed
Under the conditions of heated, keep 5-10min, be warming up to 1150-1250 DEG C with the heating rate of 2-3 DEG C/min, and keep the temperature 30-
60min.Biomass generates H by gasification2、CO、CH4Equal imflammable gas, ferriferous oxide are reduced generation direct reduced iron；
Wherein, additive is made of sodium carbonate, lateritic nickel ore, dolomite and plant ash, the mass percent of each component are as follows:
Sodium carbonate: 20%, lateritic nickel ore: 45%, dolomite: 30%, plant ash: 5%.It is worth further illustrating: lateritic nickel ore,
Dolomite and 200 mesh percent of pass of vegetation ash particle are greater than 90%.
The lateritic nickel ore chemical component mass percent are as follows: Ni:1.8%, TFe:24%, SiO2: 35%, CaO:
1.3%, MgO:16%, Al2O3: 3.5%, Cr:0.5%, remaining is impurity.
Dolomitized ingredient percent are as follows: TFe:0.28%, SiO2: 0.66%, Al2O3: 0.31%, CaO:
52.12%, MgO:31.03%.Degree of metalization, gas yield and the tar yield for being prepared into direct reduced iron are as shown in table 1；No
Gasification of biomass yield is only substantially increased, and improves the degree of metalization of direct reduced iron.And detect the iron content of embodiment 1
The compression strength of agglomerate is 4130N, improves the compression strength of iron content agglomerate, avoids iron content agglomerate powder during reaction
It is broken, the mass transfer of gas is promoted, and then improve reduction efficiency, improve degree of metalization, and improves the product of direct reduced iron
Position.
Comparative example 1
The basic content of this comparative example with embodiment 1, the difference is that: be not added additive wherein, detection reaction
The degree of metalization of direct reduced iron afterwards, gasification of biomass yield, tar yield.Experimental result record is as shown in table 1.
Comparative example 2
The basic content of this comparative example with embodiment 1, the difference is that: in iron-bearing material do not include sinter return fine,
It is only made of iron ore concentrate and blast furnace ash in iron-bearing material, the degree of metalization of direct reduced iron, gasification of biomass after detection reaction
Yield, tar yield.Experimental result record is as shown in table 1.
Comparative example 3
The basic content of this comparative example with embodiment 1, the difference is that: in iron-bearing material do not include lateritic nickel ore,
It is only made of iron ore concentrate and sinter return fine in iron-bearing material, the degree of metalization of direct reduced iron, biogas after detection reaction
Change yield, tar yield.Experimental result record is as shown in table 1.
Comparative example 4
The basic content of this comparative example with embodiment 1, the difference is that: the iron content agglomerate after drying is put into reaction
900 DEG C are gradually heated to by room temperature in device, then is warming up to 1150-1250 DEG C with the heating rate of 2-5 DEG C/min, and keep the temperature 30-
60min, the heating rate of the present embodiment are 3 DEG C/min, and warming temperature is 1200 DEG C, soaking time 40min.After detection reaction
The degree of metalization of direct reduced iron, gasification of biomass yield, tar yield.Experimental result record is as shown in table 1.
Comparative example 5
The basic content of this comparative example with embodiment 1, the difference is that: further include binder 4g；It is worth explanation
Be the binder be bentonite.The degree of metalization of direct reduced iron after detection reaction, gasification of biomass yield, tar produce
Rate.Experimental result record is as shown in table 1.In addition, also in addition detecting the compression strength of agglomerate, obtaining compression strength is 420N.
1 experimental data of table
Above-mentioned conclusion is compared, it can be deduced that draw a conclusion:
(1) by comparative example 1 and the comparison discovery of embodiment 1, at identical conditions, when additive is not added, gasification is produced
Rate is lower, and tar yield is higher, and a large amount of metal ion is contained in additive；
(2) by comparative example 2 and the comparison discovery of embodiment 1, at identical conditions, when not adding sinter return fine, tar
Conversion ratio and gasification efficiency decrease, reason may be the complex oxide in sinter return fine containing part, the complexity
Oxide may generate oxides or the complexity such as iron-nickel-magnesium with the metallic element of additive under the high temperature conditions heating
Oxide, and these oxides react on metal ion, strengthen its ion to pyrolysis products such as tar at high temperature
Deviation effect promotes the electron cloud in tar to be destroyed and loss of stability, and C-C key, c h bond is made to be easy to happen fracture, thus
Coke tar cracking has been promoted to generate small organic molecule, the H being cracked to form2、CH4Equal imflammable gas enhance pair ferriferous oxide
The reduction process of ferriferous oxide improves the degree of metalization for the direct reduced iron that reaction obtains.
(3) by comparative example 3 and the comparison discovery of embodiment 1, at identical conditions, when not adding blast furnace ash, biomass
Gasification efficiency reduce, reason is still unintelligible, but may be due in blast furnace ash contain a large amount of Na, K, Pb, Zn, these
Metal ion on the one hand enhance the attraction to larger molecular organics electronics, offset, on the other hand may under the high temperature conditions with
Ferriferous oxide or nickel iron compound combine, and improve the catalytic activity of ferriferous oxide, nickel iron compound, so as to improve catalysis effect
Fruit；Above-mentioned element not only promotes the decomposition of larger molecular organics, at the same improve improve ferriferous oxide, nickel iron compound it is anti-
Activity is answered, and promotes the reduction of ferriferous oxide, to improve degree of metalization.
(4) comparative example 4 and the comparison of embodiment 1 are found, under the conditions of identical raw material proportioning, when slow heating, tar
Yield increases, wherein may be to generate relatively large number of tar during slowly heating up due to early period, and tar is in generation
In the process just by volatilizing in container, and the oxides such as iron-nickel-magnesium or complex oxide are not yet effective during low temperature
Formed, another aspect metal ion be difficult in chilling process the larger molecular organics being effectively facilitated in tar occur cracking,
It reforms, thus the yield of incrementss tar.
(5) comparative example 5 and embodiment 1 compare it can be found that under the same conditions, if being incorporated binder, leading to
It crosses and processing is modified to biomass, to biomass and iron content powder mixing briquetting, applicant has surprisingly found that and improves instead
The compression strength of iron content agglomerate, by multiple seminar, finally think that mechanism therein may be: biomass is not modified
When, the cellulose components in biomass have certain toughness, rebound are easy after compacting, inside the pelletizing after resulting in compacting
Intergranular causes the strength reduction of iron content agglomerate away from increase.And by being modified to biomass, the iron content agglomerate being prepared,
There is better intensity instead in the case where not adding year binder, due to biomass carbonaceous pelletizing content generate crosslinking and
Fusing, makes pulverized coal particle and iron ore powder particles closely link together, to improve the intensity of carbonaceous pelletizing, improves and contain
The intensity of iron agglomerate avoids iron content agglomerate from crushing during reaction, promotes the gas transfer in iron content agglomerate, to promote
Into the ferriferous oxide and reduction solid/liquid/gas reactions in iron content agglomerate, the progress of reaction is promoted, ferriferous oxide promotes at the same time
The decomposition of biomass to improve the gasifyin g yield of biomass, and improves degree of metalization simultaneously.And due to biomass into
Row is modified, and biomass is sufficiently mixed with the NaOH in alkaline solution, and NaOH is immersed to the inside of biomass, what is be modified
Meanwhile Na element inevitably remains in inside biomass, and Na contacts more abundant with biomass, gives birth under the high temperature conditions
The electronics of substance and its decomposition product carbon atom and oxygen atom is influenced by Na is different degrees of, has promoted C-C and C-O bond angle inclined
Shifting, elongated, the carbocyclic ring irregular deformation of bond distance etc., and bond energy is caused to reduce, tar and biomass other decomposition product thermal stability
It reduces, to further increase gasifyin g yield；At the same time, the iron oxidation in the reducibility gas and iron-bearing material of generation
Object sufficiently combines, and then improves degree of metalization, the basis of direct reduced iron is provided for the steel-making of subsequent short route, with this
The yield of tar is reduced simultaneously.
Certainly, in order to realize the recycling application of biomass in the steel industry, the sustainable development of steel and iron industry is realized,
Have relevant technical staff, has carried out the technical research of related fields.For example, the title of innovation and creation are as follows: Joint Production is raw
The method and apparatus of iron and high quality synthesis gas, number of patent application: 201180048198.5, patent application day are as follows: 2011-08-
03.The patent application is aoxidized by the way that by iron ore and gas co-production, although this method is realized using biomass reduction iron
Object prepares direct reduced iron, and at the same time production imflammable gas, but due to the larger molecular organics such as tar in gasification
It cannot effectively crack, reform, so that tar removal rate is lower, gasification result is poor, this problem is also that limitation biomass is effective
The critical issue of resource application.
The inventor of this patent by unremitting exploration for a long time, have finally chosen appropriate component as biomass with contain
Iron material reaction, coproduction imflammable gas and direct reduced iron substantially increase gasification efficiency and the tar removal of biomass
Rate, has substantive distinguishing features outstanding and significant progress, and those skilled in the art more can not without creative labor
Additive so can be selected, and is applied to the co-production that iron-bearing material prepares imflammable gas and direct reduced iron.It is above-mentioned
Reaction mechanism it is not completely clear, and annoying the inventor of this patent always.In order to find out the reaction theory of the reaction, Shen
It asks someone to have carried out multiple seminar and discuss, and think wherein to may be following reason:
During 900 DEG C of heat preservations early period, forms to form micropore on iron content agglomerate, increases the specific surface area of agglomerate,
And for the oxides such as subsequent iron-nickel-magnesium or complex oxide and coke tar cracking is promoted to provide biggish reaction interface, increase simultaneously
The big response area of biomass cracking gas reducing iron oxides, on the one hand promotes the reduction step by step of ferriferous oxide and life
Gasification substance, cracking process generate a large amount of H2, CO, hydrocarbon, reproducibility with higher, which promotes
Ferriferous oxide low-temperature reduction, and additive promotes the generation of low melting point solid solution phase, so that biomass only need to be in lower temperature
Iron ore can be restored under degree, when biomass is as the reducing agent of ferriferous oxide and the source C of imflammable gas and H
Source.Ferriferous oxide serves as the standby source of iron of steel and carbon reaction generates the oxygen source of CO.Direct reduced iron is produced with standard biologic matter
Method it is different, the oxygen of this method is recycled from the inside of iron content agglomerate, rather than from by oxygen, to improve directly also
The degree of metalization of former iron；On the other hand the catalytic pyrolysis of other decomposition products of tar and biomass is promoted.
In addition, blast furnace ash and additive contain a large amount of alkaline metal ions, process of the metal ion in high-temperature heating
It is adsorbed on the surface of biomass and its decomposition product, under the high temperature conditions biomass and its decomposition product carbon atom and oxygen atom
Electronics is influenced to different extents, and has promoted the offset of C-C and C-O bond angle, elongated, the carbocyclic ring irregular deformation of bond distance etc., and make
It is reduced at bond energy, tar and other decomposition product thermal stability of biomass reduce.But when not adding additive, metal ion
Be difficult to be adsorbed on the surface of biomass cellulose so that biomass de- poly- reaction be it is leading, generation is a series of containing carbocyclic
Hydrocarbon, so that tar yield is higher.
Also, during the continuous raising biomass heating reducing iron oxides of temperature, produce a series of active iron-
The complex oxides such as nickel-magnesium, including: calcium iron compound, calcium and magnesium compound, fayalite, iron-doped nickel oxide etc., high temperature item
These material surfaces reactivity with higher and polar activation position, on the one hand promote the movement of metal ion, add under part
Strong ion deviation effect of the metal ion to pyrolysis products such as tar at high temperature；In addition, the fused ring compound in tar contains
There is the pi-electron system of negatively charged, pi-electron cloud is destroyed and loss of stability, and so that C-C key, c h bond is easy to happen fracture, from
And cracking activation energy is reduced, the oxides such as iron-nickel-magnesium or complex oxide further promote the larger molecular organics such as tar to send out
Raw catalytic degradation is easily degraded, and generate a series of so that open loop cleavage reaction occurs for the larger molecular organics in tar
Low-molecular-weight hydrocarbon, improves the gasification transformation efficiency of biomass, and reduces the yield of tar.Wherein, especially nickel
Ferriferous oxide reduces hydrocarbon and CH4Content, H in fuel gas2It is dramatically increased with CO content, certain ferriferous oxide
During organic matter is catalytically decomposed, itself is also constantly participating in reaction process, and constantly restores and obtain directly also
Former iron, to improve the degree of metalization of direct reduced iron.
S200: step 2: electro-smelting
Direct reduced iron hot charging is sent into electric furnace, and slag former is added into electric furnace, oxygen blast melting is carried out using oxygen rifle,
It taps after oxygen blast melting, FeO content is 12~20% in electro-smelting heat of oxidation clinker, dual alkalinity R=2~3；The present embodiment
FeO content is 15%, dual alkalinity R=1.5.And controlling tapping temperature is 1520 DEG C -1620 DEG C, the present embodiment 1580
DEG C, P content < 0.02%.The slag former includes lime and iron scale, and wherein mass percent is lime 90%, iron oxide
Skin 10%.The ingredient of smelting molten steel is [C]: 0.09%, [S]: 0.05%, [P]: 0.15%.
A kind of biomass iron content agglomerate mini-mill steelmaking method of the invention, by the way that iron content agglomerate to be put into elevated temperature vessel
It is heated, ferriferous oxide is reduced generation direct reduced iron, then melting in electric furnace is sent into direct reduced iron hot charging and is closed
Lattice molten steel realizes the mini-mill steelmaking of biomass iron content agglomerate, has broken what smelting molten steel in the prior art must blow
Technology cognition, enables one step of biomass iron content agglomerate directly to produce liquid molten steel, has simplified traditional one iron of iron-bearing mineral
The technique of one molten steel of water or direct reduced iron, high production efficiency, and obtained molten steel composition complies fully with requirement, utilizes biomass
Instead of the coal and coke of traditional iron-smelting process, efficiency of energy utilization is improved, and realizes sustainable development；It is reduced directly in production
Gasification of biomass produces to obtain imflammable gas during iron, and reduces tar content, while improving gasifyin g yield, flammable
Gas can be used for toasting, preheat metallurgical equipment or raw material, improve the utilization rate of the energy.
Embodiment 2
The basic content of the present embodiment with embodiment 1, the difference is that:
The additive of the step 1 is made of sodium carbonate, lateritic nickel ore, dolomite, plant ash and chromium slag；Each component
Mass percent are as follows: sodium carbonate: 15%, lateritic nickel ore: 30%, dolomite: 30%, plant ash: 15%, chromium slag: 10%.It is described
Chromium slag chemical component mass percent it is as follows: SiO2: 28%, Al2O3: 8%, CaO:30%, MgO:15%, Fe2O3: 10%,
Cr2O6: 0.8% and Na2Cr2O7: 1%, remaining is impurity.The degree of metalization of direct reduced iron, gasification of biomass after detection reaction
Yield, tar yield.Experimental result record is as shown in table 1.It is worth noting that modified solution therein is alkaline solution, it is described
Alkaline solution be KOH solution, the mass concentration of KOH solution is 3%.High reproducibility item of the one side chromium slag in gasification of biomass
Under part, chromium slag is effectively restored, generates the chromated oxide of reserve price, ferriferous oxide, calcium-magnesium ratio in chromated oxide and agglomerate
It closes object to combine, promotes the high efficiency cracking of the larger molecular organics in tar, so that small molecule imflammable gas is generated, iron oxygen
Compound constantly restores and obtains direct reduced iron during organic matter is catalytically decomposed,
The step 2: electro-smelting: direct reduced iron hot charging being sent into electric furnace, and slag former is added into electric furnace,
It taps after oxygen blast melting, FeO content is 12~20% in electro-smelting heat of oxidation clinker, dual alkalinity R=2~3；The present embodiment
FeO content is 18%, dual alkalinity R=2.6.And control tapping temperature be 1520 DEG C -1620 DEG C, the present embodiment be 1600 ±
10 DEG C, P content < 0.02%, the slag former is lime；Certainly slag former herein can also use, in the prior art often
The slag former of rule is replaced.
A kind of biomass iron content agglomerate mini-mill steelmaking method of the invention, by the way that iron content agglomerate to be put into elevated temperature vessel
It is heated, ferriferous oxide is reduced generation direct reduced iron, then melting in electric furnace is sent into direct reduced iron hot charging and is closed
Lattice molten steel realizes the mini-mill steelmaking of biomass iron content agglomerate；Of the invention improves the quality of direct reduced iron, and after being
Continuous molten steel is laid a good foundation；Chromated oxide is reduced and is deposited in direct reduced iron simultaneously, increases the chromium in steel
Content provides the foundation for subsequent smelting stainless steel, and reduces the additional amount of the raw metal in alloying process, to drop
Low smelting cost.
Embodiment 3
The basic content of the present embodiment with embodiment 1, the difference is that:
The iron ore concentrate of the step 1 is formed by breathing out Yang Di, Tu Balang powder, Canadian fine powder, the mixed powder in Kazakhstan and Jin Buba powder,
The ingredient of mine is as shown in table 2, the mass percent of various miberal powders are as follows: Ha Yangdi: 10%, Tu Balang powder: 20%, Canada's essence
Powder: 40%, mixed powder: 15%, Jin Buba powder: 15% is breathed out.The degree of metalization of direct reduced iron, gasification of biomass produce after detection reaction
Rate, tar yield, experimental result record are as shown in table 1.
2 miberal powder ingredient (wt/%) of table
It is worth noting that modified solution therein is alkaline solution, the alkaline solution is NaOH and Ca (OH)2's
Mixed solution, the mass concentration of mixed solution are 4%, NaOH and Ca (OH)2Mass ratio be 4:1.
The step 2: electro-smelting: direct reduced iron hot charging being sent into electric furnace, and slag former is added into electric furnace,
It taps after oxygen blast melting, FeO content is 12~20% in electro-smelting heat of oxidation clinker, dual alkalinity R=2~3；The present embodiment
FeO content is 12%, dual alkalinity R=2.1.And control tapping temperature be 1520 DEG C -1620 DEG C, the present embodiment be 1620 ±
10 DEG C, P content < 0.02%, the slag former is lime；Certainly slag former herein can also use, in the prior art often
The slag former of rule is replaced.
A kind of biomass iron content agglomerate mini-mill steelmaking method of the invention, by the way that iron content agglomerate to be put into elevated temperature vessel
Heated, ferriferous oxide is reduced generation direct reduced iron, and wherein inventor thinks: this process may be to keep the temperature at 900 DEG C
During, the crystallization water in Iron Ore Powder is thermally decomposed, and more gap is generated in iron content agglomerate, to increase iron oxygen
The gas-solid reaction interface of compound reduction, these gaps, which increase ferriferous oxide and its complex compound, the macromolecular in tar
The catalytic action of machine object, and the H that the crystallization water is generated by thermal decomposition2O diffuses in the reactor, which is catalyzed in ferriferous oxide
Under, cracking/reformation of macromolecular is promoted, to improve the transformation efficiency of tar, ferriferous oxide is in catalysis point during this
During solving organic matter, constantly restores and obtain direct reduced iron.Melting in electric furnace is sent into direct reduced iron hot charging again
Qualified molten steel is obtained, the mini-mill steelmaking of biomass iron content agglomerate is realized, having broken smelting molten steel in the prior art must carry out
The technology of blowing recognizes, and one step of biomass iron content agglomerate is enable directly to produce liquid molten steel, has simplified traditional containing iron ore
The technique of one molten steel of one molten iron of object or direct reduced iron, high production efficiency, and obtained molten steel composition complies fully with requirement.
Embodiment 4
The basic content of the present embodiment with embodiment 1, the difference is that:
The additive of the step 1 is made of sodium carbonate, potassium chloride, lateritic nickel ore, dolomite, plant ash, each component
Mass percent are as follows: sodium carbonate: 15%, potassium chloride: 20%, lateritic nickel ore: 25%, dolomite: 30%, plant ash: 10%.Inspection
Survey the degree of metalization of direct reduced iron after reacting, gasification of biomass yield, tar yield.Experimental result record is as shown in table 1.Value
It obtains it is to be noted that modified solution therein is alkaline solution, the alkaline solution is NaOH solution, and the quality of NaOH solution is dense
Degree is 1%.Alkali metal ion is mainly the further cracking that alkali metal promotes the larger molecular organics such as tar, it is suppressed that high temperature
Small molecule is reunited under environment, improves the transformation efficiency of tar, and additive promotes ferriferous oxide in conjunction with larger molecular organics,
Ferriferous oxide constantly restores during organic matter is catalytically decomposed and obtains direct reduced iron.
The step 2: electro-smelting: direct reduced iron hot charging being sent into electric furnace, and slag former is added into electric furnace,
It taps after oxygen blast melting, FeO content is 12~20% in electro-smelting heat of oxidation clinker, dual alkalinity R=2~3；The present embodiment
FeO content is 12%, dual alkalinity R=2.1.And control tapping temperature be 1520 DEG C -1620 DEG C, the present embodiment be 1520 ±
10 DEG C, P content < 0.02%, the slag former be lime, fluorite and manganeisen, mass percent are as follows: lime: 90%, firefly
Stone: 2%, manganese iron: 8%；Certainly slag former herein can also use, and conventional slag former is replaced in the prior art.Smelting
The ingredient of water is made steel substantially with embodiment 1.
A kind of biomass iron content agglomerate mini-mill steelmaking method of the invention, by the way that iron content agglomerate to be put into elevated temperature vessel
It is heated, ferriferous oxide is reduced generation direct reduced iron, then melting in electric furnace is sent into direct reduced iron hot charging and is closed
Lattice molten steel realizes the mini-mill steelmaking of biomass iron content agglomerate, and one step of biomass iron content agglomerate is enable directly to produce liquid
State molten steel, the technique for having simplified traditional one molten steel of one molten iron of iron-bearing mineral or direct reduced iron, high production efficiency, and obtain
Molten steel composition complies fully with requirement.
Embodiment 5
The basic content of the present embodiment with embodiment 1, the difference is that:
The additive of the step 1 is by sodium carbonate, lateritic nickel ore, dolomite, plant ash, chromium slag and v-ti magnetite slag
Composition, the mass percent of each component are as follows: sodium carbonate: 15%, lateritic nickel ore: 30%, dolomite: 20%, plant ash: 10%,
Chromium slag: 10%, v-ti magnetite slag: 15%.The degree of metalization of direct reduced iron, gasification of biomass yield, coke after detection reaction
Oil yield.Experimental result record is as shown in table 1.The oxide that ferrovanadium, iron nickel are generated during heating, promotes in metal ion
Electronic migration occurs for the larger molecular organics in tar, on the basis of reducing degrading activity, the oxide promotion of ferrovanadium, iron nickel
Coke tar cracking in biomass, ferrovanadium, iron nickel oxide organic matter is catalytically decomposed during, it is continuous to restore simultaneously
To direct reduced iron, improve degree of metalization, for improve molten steel beneficial element content.
The step 2: electro-smelting: direct reduced iron hot charging being sent into electric furnace, and slag former is added into electric furnace,
It taps after oxygen blast melting, FeO content is 12~20% in electro-smelting heat of oxidation clinker, dual alkalinity R=2~3；The present embodiment
FeO content is 18%, dual alkalinity R=3.0.And control tapping temperature be 1520 DEG C -1620 DEG C, the present embodiment be 1580 ±
10 DEG C, P content < 0.02%, the slag former is lime, and slag former herein can also use certainly, in the prior art often
The slag former of rule is replaced.The ingredient of smelting molten steel is substantially the same as embodiment 1.
A kind of biomass iron content agglomerate mini-mill steelmaking method of the invention, by the way that iron content agglomerate to be put into elevated temperature vessel
It is heated, ferriferous oxide is reduced generation direct reduced iron, then melting in electric furnace is sent into direct reduced iron hot charging and is closed
Lattice molten steel realizes the mini-mill steelmaking of biomass iron content agglomerate, and one step of biomass iron content agglomerate is enable directly to produce liquid
State molten steel, the technique for having simplified traditional one molten steel of one molten iron of iron-bearing mineral or direct reduced iron.
Embodiment 6
The method of the kind biomass iron content agglomerate short route production stainless steel of the present embodiment, basic content is with embodiment 1, no
It is with place: decarburization in AOD furnace is added in the molten steel that step 2 is smelted and is warming up to 1650-1680 DEG C, the present embodiment is
1660 ± 10 DEG C, then the raw metal containing chromium is added into furnace and carries out alloying, the raw metal containing chromium includes ferrochrome, chromium
The combination of iron ore or both, and ferrosilicon and lime is added as exothermic mixture, utilize the chemistry of oxidation release of the Si in molten bath
Hot heated molten bath, to smelt the stainless steel containing chromium using heating, lime raising basicity of slag is added can anti-non-return sulphur.Again will
Molten steel after alloying, which is transported in VOD furnace, carries out deep decarburization, and argon bottom-blowing stirring when reaching component requirements, terminates VOD vacuum
Refining, endpoint carbon content 0.02-0.04%, the present embodiment endpoint carbon content 0.02%.
The present invention is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that can not take off
It is carry out various modifications in the case where from the scope of the present invention being defined by the following claims and modification.Detailed description and drawings
Should be to be considered only as it is illustrative and not restrictive, if there is any such modifications and variations, then they all will
It falls into the scope of the present invention described herein.In addition, Development Status and meaning that background technique is intended in order to illustrate this technology,
It is not intended to limit the present invention or the application and application field of the invention.
More specifically, although exemplary embodiment of the present invention has been described herein, the invention is not limited to
These embodiments, but including those skilled in the art according to front detailed description it can be appreciated that it is modified, omit,
Any and whole embodiments of (such as between each embodiment) combination, adaptive change and/or replacement.In claim
It limits the language according to used in claim and is widely explained, and be not limited in foregoing detailed description or in reality
The example described during this application is applied, these examples should be considered as nonexcludability.For example, in the present invention, term is " preferably
Ground " be not it is exclusive, here it means that " preferably, but be not restricted to that ".It is in office where method or process claims
In any step for enumerating can execute in any order and be not limited to the sequence proposed in claim.Therefore, of the invention
Range should only be determined by appended claims and its legal equivalents, rather than by descriptions and examples given above Lai
It determines.
Claims (10)
1. a kind of biomass iron content agglomerate mini-mill steelmaking method, it is characterised in that:
Step 1: production direct reduced iron
By biomass, iron-bearing material and additive mix pressurize be made iron content agglomerate, by iron content agglomerate be put into elevated temperature vessel into
Row heating, ferriferous oxide are reduced generation direct reduced iron, the additive include sodium carbonate, lateritic nickel ore, dolomite and
Plant ash, the mass percent of each component are as follows: sodium carbonate: 20%, lateritic nickel ore: 45%, dolomite: 30%, plant ash: 5%；
Wherein iron-bearing material includes blast furnace ash, sinter return fine and iron ore concentrate, the mass percent of each component are as follows: blast furnace ash: 5%, is sintered
It returns mine: 10%, iron ore concentrate: 85%；
Step 2: electro-smelting
Direct reduced iron hot charging is sent into electric furnace, and slag former is added into electric furnace, is tapped after oxygen blast melting.
2. a kind of biomass iron content agglomerate mini-mill steelmaking method according to claim 1, it is characterised in that: the life
Substance, which immerses in modified solution, is modified processing, then biomass, iron-bearing material and the additive after modification are mixed and added
Iron content agglomerate is suppressed to obtain, the temperature that modified solution is modified processing to biomass is 80-95 DEG C.
3. a kind of biomass iron content agglomerate mini-mill steelmaking method according to claim 2, it is characterised in that: described changes
Property solution be alkaline solution.
4. a kind of biomass iron content agglomerate mini-mill steelmaking method according to claim 3, it is characterised in that: described changes
Property solution be NaOH, Ca (OH)2, one of KOH or two or more combinations.
5. a kind of biomass iron content agglomerate mini-mill steelmaking method according to claim 4, it is characterised in that: electro-smelting
FeO content is 12~20% in heat of oxidation clinker, dual alkalinity R=2~3.
6. a kind of biomass iron content agglomerate mini-mill steelmaking method according to claim 1-5, it is characterised in that:
Step 1: specific step is as follows for production direct reduced iron:
(1) biomass is immersed in modified solution and impregnates 1-2h, dried in an oven after the completion of impregnating, complete changing for biomass
Property；
(2) biomass, iron-bearing material, additive are mixed, iron content group is prepared in 150-400 DEG C of hot pressing by cuber
Block；
(3) the iron content agglomerate after drying is put into 800-900 DEG C of elevated temperature vessel, keeps 5-10min, then be warming up to 1150-
1250 DEG C, and keep the temperature 30-60min.
7. a kind of biomass iron content agglomerate mini-mill steelmaking method according to claim 6, it is characterised in that: described contains
Iron material, biomass and additive are formed by following mass fraction:
50-60 parts of biomass；
100-200 parts of iron-bearing material；
5-10 parts of additive.
8. a kind of biomass iron content agglomerate mini-mill steelmaking method according to claim 6, it is characterised in that: the carbonic acid
Sodium, lateritic nickel ore, dolomite and 200 mesh percent of pass of vegetation ash particle are greater than 90%.
9. a kind of method of biomass iron content agglomerate short route production stainless steel, it is characterised in that: any using claim 1-8
Mini-mill steelmaking method described in one smelts to obtain molten steel, and decarburization in AOD furnace is added in molten steel and is warming up to 1650-1680 DEG C,
The raw metal containing chromium is added into furnace again and carries out alloying；The molten steel after alloying is transported in VOD furnace again and carries out deep take off
Carbon obtains stainless steel.
10. a kind of method of biomass iron content agglomerate short route production stainless steel according to claim 9, feature exist
In: processing of being skimmed after AOD furnace smelting completion, which is transported in VOD furnace, carries out deep decarburization, endpoint carbon content 0.02-0.04%.
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