CN102918169A - Bentonite-bonded pressed articles from fine-grain oxidic iron carriers - Google Patents
Bentonite-bonded pressed articles from fine-grain oxidic iron carriers Download PDFInfo
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- CN102918169A CN102918169A CN2011800201683A CN201180020168A CN102918169A CN 102918169 A CN102918169 A CN 102918169A CN 2011800201683 A CN2011800201683 A CN 2011800201683A CN 201180020168 A CN201180020168 A CN 201180020168A CN 102918169 A CN102918169 A CN 102918169A
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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
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
-
- 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
- C21C5/56—Manufacture of steel by other methods
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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
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2200/00—Recycling of non-gaseous waste material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/002—Evacuating and treating of exhaust gases
-
- 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
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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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
-
- 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
- Y02P10/25—Process efficiency
Abstract
The invention relates to a method for producing iron-oxide-containing pressed articles from fine-grain oxidic iron carriers by producing a mixture which comprises fine-grain oxidic iron carriers, bentonite as a binder, and water, pressing the mixture, and curing the green pressed articles obtained during the pressing, as well as to pressed articles produced by the method and to the use of the pressed articles as lumpy iron carriers. According to the invention, after the components of the mixture have been assembled, said mixture is subjected to a kneading process of at least 3 minutes and up to 30 minutes, which is followed by the pressing. The pressed articles are produced without any souring process.
Description
Technical field
The present invention relates to the method that the preparation of a kind of oxide compound by particulate (oxidisch) siderophore contains the pressed compact of ferriferous oxide, the method be by preparation comprise the oxide compound siderophore of particulate, as the wilkinite of binding agent and the mixture of water, suppress described mixture, and the pressed compact blank sclerosis that obtains when suppressing is implemented, and relate to pressed compact and the purposes of this pressed compact as block siderophore that the method makes.
Background technology
In the technique of many preparation sponge iron, wherein use the direct-reduction shaft furnace (Direktreduktionsschacht) with fixed bed, for example according to MIDREX
Or HYL
Technique perhaps in the smelting reduction process of producing liquid pig iron, is wherein reduced in shaft furnace, for example at COREX
In the technique, bulk oxide siderophore for example massive ore or pelletizing is used as parent material.Because transportation and processing, bulk oxide siderophore are worn or possibility is broken.The product of this degraded too carefully can not be used for having the direct-reduction shaft furnace of fixed bed, because their integral body has reduced the ventilation property of fixed bed, and reducing gas skewness or because the risk of the regional incomplete reduction generation passage of associated some (Channelling) have been increased.Therefore before joining the direct-reduction shaft furnace with Solid Bed, must will from the bulk oxide siderophore, separate because of the oxide compound siderophore particulate (Unterkorn) that this degraded produces by screening (Absiebung) and/or screening (Sichtung), for example by screening in the granularity 6.3mm situation and in granularity＜200 μ m situations, sieving.
The term particulate refers to granularity less than 10mm, preferably less than 6.3mm, particularly preferably less than the particle of 5mm.These numeric representations are used for the mesh width of the screen cloth of screening, and particulate falls through mesh.
The granularity of particulate is called as particulate.
In order to use particulate, must change it into bulk form, Here it is carry out coalescent.
If have sintering or pelletizing group equipment nearby, then can utilize this device that particulate is coalescent.In the clustered aggregates of being everlasting, also there is the cold pressing block equipment that is used for the particulate briquetting.
In some cases, the particulate of bulk oxide also is returned to the ore supplier by transporting back.
For example pelletizing is rolled into a ball or sintering only can move economically in large-scale mode for the coalescent method that fine particle materials is changed into bulk form.Therefore, often do not implement coalescently, the particulate that bulk oxide siderophore degraded produces is accumulated and is not utilized.
Summary of the invention
Technical purpose
The purpose of this invention is to provide and a kind of particulate is converted into the method for bulk form, its with the particulate exploitation with economically for the preparation of sponge iron or liquid pig iron.
Technical scheme
The method of the pressed compact (Pressling) of this purpose by being prepared oxides-containing iron by the oxide compound siderophore of particulate realizes, the method is the oxide compound siderophore that comprises particulate by preparation, wilkinite as binding agent, mixture with water, suppress described mixture, and make pressed compact blank (the Gr ü npresslinge) sclerosis that obtains when suppressing become the pressed compact realization, it is characterized in that mixture is merged by going through 3 minutes in its component at least, preferably at least 5 minutes, maximum 30 minutes, preferred maximum 20 minutes, particularly preferably maximum 15 minutes kneading processes (Knetvorgang) is suppressed subsequently.
The agglomerate of this pressed compact for making from fine particle materials by compacting.Being exemplified as briquetting, lamellar body and plate or extruding the line body of pressed compact form
Or by plate or extrude the line body and carefully decompose the block fragment that (Desagglomeration) obtains.
Group compares with pelletizing, the advantage that is prepared pressed compact by the oxide compound siderophore of particulate is the preparation pressed compact, for example briquetting can be made a response more neatly for the fluctuation of raw materials used quality and quantity, and can need not to prepare raw materials used and fire the pelletizing blank by fine grinding.The preparation of pressed compact, for example therefore briquetting is more suitable in principle in the particulate of processing to give birth to up to the 100000t/a volume production.
Wilkinite is as binding agent.At this, wilkinite is interpreted as a kind of like this material, and it is the mixture of various clay minerals, and contains smectite type (smektititsch) layered silicate, and preferred montmorillonite is as principal constituent.The smectite type layered silicate, the amount of preferred montmorillonite is at least 60% by weight percentage, and preferably at least 70%.Wherein wilkinite can be the rock of nature existence or the derivative that naturally has rock that makes by adding additive or methods ﹠﹠ steps of implementation.
The oxide compound siderophore of term particulate also means for example at the dust that bulk oxide siderophore when filling with substance is produced.
Mixture preferably includes the wilkinite of 3-12 % by weight, take the amount of the oxide compound siderophore of particulate as the basis, and preferred 6-10 % by weight.When the wilkinite amount is few, can not guarantee sufficient binding agent effect.When the wilkinite amount was more, extra consumption of bentonite can not provide any obvious gain to its effect as the binding agent in the pressed compact.In addition, because higher bentonite content has increased the formation of slag, pressed compact is more difficult in the further processing of steel mill.In addition, higher bentonite content has represented unnecessary ballast in the pressed compact transportation.
The component of mixture can merge in one or more steps.For example, adding water with before adjusting dough shape (teigig) denseness, the solid ingredient of mixture just can merge and pre-mixing.Then the dough shape mixture of all components experienced the kneading process.
But the solid of mixture and liquid ingredient also can all merge in a step.
The kneading process continues at least 3 minutes, preferably at least 5 minutes, maximum 30 minutes, preferred maximum 20 minutes, particularly preferably maximum 15 minutes, wherein comprises end value in each situation.When time length during less than 3 minutes, the pressed compact blank of acquisition and the performance of pressed compact are inadequate.When the time length was higher than 30 minutes, the performance of pressed compact blank and pressed compact did not significantly change, and still along with the increase of kneading process time, compared temporal gain with maturation process and descended.
Beneficial effect of the present invention
When using wilkinite as binding agent, usually make the mixture that contains wilkinite and water, particularly wilkinite, the process of swelling several hours when leaving standstill-be also referred to as slaking-, so that the viscosifying power of bentonite adhesive obtains performance.The slaking time length is called as the curing time.
By be combined the kneading process of the mixture experience after its component according to the present invention, can abandon slaking consuming time and to the not significantly infringement or even be improved of the performance of pressed compact.For given treatment capacity, this can reduce the required storage space of this treatment step (volume of storage or stacking), or can realize higher treatment capacity under given storage size.In addition, mixture-and the structure of the finished product pressed compact that obtains thus-be uniformly, obtain the required binder amount of certain pressed compact quality thereby can be reduced to.
Table 1 show for the preparation of in the test of pressed compact about the fall strength of briquette (Sturzfestigkeit, SF) of pressed compact in the test scope of activity with put the assessment result of Compressive Strength (PDF).Wherein, by according to the method with kneading process of the present invention, or prepare pressed compact according to the prior art with slaking.Described pressed compact is briquetting.
At respectively identical raw material and in other respects under the identical condition, the pressed compact blank and the pressed compact that make according to the present invention, and the pressed compact blank that is made by slaking and the fall strength of briquette of pressed compact all are same magnitude for the pressed compact blank with through the pressed compact of dry air and heated drying.
Compare with pressed compact with the pressed compact blank that is made by slaking, at respectively identical raw material and in other respects under the identical condition, the pressed compact and the pressed compact blank that make according to the inventive method have demonstrated the rising of putting Compressive Strength, are particularly preparing in the situation of pressed compact by heated drying.
The behavior of the relevant point of pressed compact Compressive Strength is in the behavior that is considered to behind the heated drying indicate after pressed compact adds the reduction zone.Particularly owing to their strength property that presses, the pressed compact that makes according to the present invention is compared with the pressed compact that slaking makes and is more suitable for for industrial reduction technique.
The sintering charging (FERTECO) that comes from the Fabrica ore deposit in Djilas,Minas,Brazil state is used for all tests shown in the table 1 as the oxide compound siderophore of particulate.Granularity for the production of pressed compact is 0-8mm, and d50 is 0.75mm, and d95 is 3.15mm.In order to adjust constant test conditions, before the test, this sintering charging by heated drying to water content＜1%.
Use following commercial wilkinite:
IK=IKO Bond D
(from IKO
The calcium bentonite of the activation of company contains about 90% montmorillonite)
VO=VOCLAY
(from the natural sodium bentonite of S ü d-Chemie company, containing the montmorillonite of about 70-80%)
TI=TIXOTON
(calcium bentonite from the activation of S ü d-Chemie company contains about 70% montmorillonite)
CA=CALCIGEL
(from the natural calcium wilkinite of S ü d-Chemie company)
Mixture from
Make in the FM130D type batch mixing machine (Chargenmischer) of company.
In order during the kneading process, to supply with heat in the mixture heating that kneading device is randomly implemented is undertaken by shell, the saturation steam of 6-8bar is provided for this reason.
By from
The 52/10 type test roll squeezer of company prepares the pressed compact blank.The pillow-like specification that is selected for the pressed compact blank has 20cm
3Nominal volume.Material to be pressed distributes by gravity-feeder.Make complex body by a plurality of pressed compact body compositions by the test roll squeezer.There are the pressed compact blank in fringe region and central zone at complex body in this complex body.
In order to obtain single pressed compact blank or single pressed compact for use in measuring fall strength of briquette and some Compressive Strength, this complex body breaks along the separation slit between the single pressed compact blank.Usually the process of taking out from the test roll squeezer, complex body is broken into single pressed compact blank.
According to table 1 preparation pressed compact the time, at first be wilkinite (Bent) and the oxide compound siderophore that is injected towards particulate by water (W) of following, mixing time is 2 minutes in each case.The percentages that is used for wilkinite and water is weight percentage; Weight percent is based on the amount of the particulate oxide compound siderophore that uses in the separately test.
After the combination treatment, mixture carries out kneading in kneading device, to prepare according to pressed compact of the present invention.In this process, this kneading device randomly is heated, and is specially the indirect heating by shell.The result who obtains by this way represents that by be designated as kneading+H in processing the hurdle H represents heating in table 1.In processing the hurdle, be designated as kneading-H and represent that kneading device is not heated.
In order to prepare pressed compact under slaking, mixture rests in the maturation vessel after combination treatment.
In kneading device after the kneading process, or in maturation vessel after the slaking, mixture is implemented compacting, thereby is made the pressed compact blank as material to be pressed in the test roll squeezer.
Thus obtained pressed compact blank remains soft, and this is hardened it, thereby obtained final pressed compact by technical term " blank (gr ü n) " expression.This sclerosis for example can at least part of drying and/or thermal treatment enforcement by depositing in air.
After the compacting, detect respectively immediately fall strength of briquette (SF) and the some Compressive Strength (PDF) of single pressed compact blank (technical term is blank).The result of these detections is shown in SF blank and the PDF blank hurdle.The measurement of fall strength of briquette and some Compressive Strength repeats behind sclerosis 1h and harden in air 24h or the 72h in air respectively.The result of these detections is in that " SF is (72h) n.24h
*" and " PDF is (72h) n.24h
*" shown in the hurdle.
The pressed compact blank that obtains in testing is separately partly measured at 290 ℃ of lower dry 30min, and detects equally fall strength of briquette and some Compressive Strength after the cooling in air.The result of these detections is shown in " SF is dry " and " PDF is dry " hurdle.
In the fall down test (according to ASTM D440) that is used for determining fall strength of briquette, the sample of the sample of the pressed compact blank of heavy 4kg or the pressed compact that hardens by air drying or heated drying drops down onto collection container 4 times from the high position of 2m through drop pipe, and the form of solid steel plate is made in the bottom of collection container.Drop pipe has the diameter of 200mm, and collection container has the diameter of 260mm.The thickness of steel plate is 12mm.After falling for second and the 4th time by sizing analysis assessment fall down test.Numerical value in the table 1 represents that respectively four lower particle size fractions that fall behind divide＞ratio of 20mm.
For the measuring point Compressive Strength, use 469 type test machines from ERICHSEN company.In this testing method, single pressed compact blank or be clamped between two clampers by the pressed compact that air drying or heated drying harden, clamper wherein and force transducer coupling, top clamper is regulated continuously by worm drive, to apply the pressure load that increases gradually.Following clamper is formed by the disk of diameter 80mm, and the top horizontal round steel by diameter 10mm forms.The speed that top clamper advances is 8mm/min.The point Compressive Strength is recorded as the ultimate load record before blank or the sclerosis pressed compact fragmentation, the typing value representation in the table 1 take newton as unit because the equalization point Compressive Strength of some compressive load when broken.Six pressed compact blanks or the pressed compact of six pressed compact blanks of the complex body central zone that obtains in the test roll squeezer or pressed compact and fringe region have been detected respectively.Detect the data that obtain by these and calculate mean value, wherein minimum and maximum value is not all considered.Mean value is pointed out in table 1.
Table 1
Embodiment
The present invention also provides a kind of pressed compact by obtaining according to the inventive method, and the pressed compact that obtains according to the inventive method is as the application of bulk oxide siderophore for the preparation of cavernous body or the liquid pig iron.Sponge iron for example can prepare in reduction shaft furnace, rotary oven or swivel pipe, and sponge iron can become for the intermediates of producing liquid pig iron at smelting reduction process by means of melting gasification furnace in this case.It also can be melting and reducing-direct-reduction combination plant or direct-reduction-gasification combination plant.
For this application, pressed compact uses in the mode identical with the bulk oxide siderophore of other types.
Preferred implementation according to the inventive method, mixture also comprises the metallurgical retained material of iron content, the Fe fine powder for example metallizes, iron scale is rolling iron scale for example, metallurgical dust is blast furnace dust or converter dust or BOF ejecta or scraps fine dust or EAF ejecta or EAF dust for example, metallurgical mud is blast furnace mud or BOF mud or hot rolling mill mud for example, small-sized iron material, iron filings.
These materials that come from cleaning apparatus or washer are before being used for the pressed compact preparation according to the present invention, it randomly implements preparation step to carry out the iron enrichment.
Mixture preferably includes at least a member in following group:
-metallization Fe fine powder,
-iron scale
-metallurgical dust
-metallurgical mud
-come from the material of process for making, utilized sponge iron and/or the pig iron by using pressed compact prepared in accordance with the present invention to obtain in this process for making.
Wherein also comprise, use the fine material that for example sieves out from sponge iron.
For example, wherein be also included within the equipment for the production of sponge iron and/or the pig iron, for example direct-reduction shaft furnace or melting gasification furnace are for example closed down the material that produces in the process owing to what maintenance reasons was implemented, use after screening.Term metallization Fe fine powder is used for representing fine grain metallization iron (Fe) carrier that wherein fine particle represents that particle diameter is up to 6mm.The total content of the preferred iron of iron containing metallurgical retained material and carbon is higher than 50 % by weight.Yet in the method for the invention use is significant economically from which kind of total content of iron and carbon, depends on the growing amount of iron containing metallurgical retained material and the waste treatment cost of these iron containing metallurgical retained materials.The preferred material that comes from process for making that uses has utilized sponge iron and/or the pig iron by using pressed compact prepared in accordance with the present invention to obtain in this process for making.By this way, these metallurgical retained materials can be back in the technique that causes its generation.This returning is profitable, because metallurgical retained material, the Fe fine powder that for example metallizes, iron scale, metallurgical dust, metallurgical mud contains a high proportion of iron and/or carbon, and this salvage material need not expensive waste treatment.In reducing process, the iron that contains in the metallurgical retained material causes the saving of iron ore, and carbon causes the saving of reductive agent.
Some metallurgical retained material, particularly iron scale, small-sized iron material, iron filings, because their particle shape or their mechanical property improve for destroying the pressed compact applied force by mechanical internal friction power, play the effect of structural reinforcing component in pressed compact.Required power is larger, and the intensity of pressed compact is larger.The structural reinforcing effect shows by the raising of compact strength.Intensity is differently treated by cold strength (expression room temperature under intensity) and hot strength (being illustrated in the intensity under the temperature that is higher than room temperature that the test conditions set respectively defines) usually.Except improving by the iron containing metallurgical retained material the cold strength of pressed compact, the hot strength of pressed compact particularly under the existing condition, also can be improved by the iron containing metallurgical retained material in reduction process.The carbon that contains in many metallurgical retained materials is passable, for example when the heating pressed compact, impels reduction reaction to occur in the inside of pressed compact, and this causes the enhancing of pressed compact hot strength conversely.
When using particulate oxide compound siderophore and metallurgical retained material to prepare pressed compact simultaneously, pressed compact obtains the intensity of adding thus.Therefore can save binding agent, it appears at and really is used for giving intensity in the pressed compact, and has therefore limited the introducing that inert substance in the pressed compact or slag form agent.
According to consumption, can comprise the iron containing metallurgical retained material of the highest 100 % by weight in the mixture, take particulate oxide compound siderophore amount as the basis.
According to another preferred implementation, mixture also can contain fine grain rhombohedral iron ore and/or limonite material, and wherein fine particle is interpreted as that particle diameter is less than 6mm.If there is the oxide material that is difficult to reduce by method of reducing, magnetite form particularly, follow so the material that the reduction kinetics problem of these materials can be by will being difficult to reduce-for example with the magnetite form exist-with by the easy fine particle materials of reduction-particularly exist-mix with rhombohedral iron ore or limonite form to be overcome of identical method of reducing.According to austrian patent AT399887, can expect the improvement of reduction kinetics by this mixture.
Fine grain reducible material forms in the equipment that utilizes reducing gas reduced oxide siderophore, for example at the equipment of implementing process for producing sponge iron, wherein uses the direct-reduction shaft furnace with fixed bed, for example according to MIDREX
Or HYL
Technique perhaps forms in producing the smelting reduction process of liquid pig iron, particularly since from the cleaning apparatus or the dust of washer or the form of mud that are used for furnace top gas, reducing gas or producer gas are removed dust.
Because material is back in the technological cycle, use this material to increase the economy of producing the method for sponge iron or liquid pig iron.For the reason on the process economics, the mixture that is preferred for preparing the pressed compact of oxides-containing iron also contains the fine particle materials that forms from furnace top gas, reducing gas or producer gas dust removal process to equipment, and this equipment is used for utilizing reducing gas reduced oxide siderophore.
At this, furnace top gas is interpreted as, after implementing the restore task relevant with the oxide compound siderophore from the equipment that the oxide compound siderophore is housed of having realized restore task expellant gas.For example, in the direct-reduction situation in the direct-reduction shaft furnace, furnace top gas is from direct-reduction shaft furnace expellant gas.
Producer gas is interpreted as at melting gasification furnace, or for the preparation of in the gases used coal gasifier of direct-reduction iron ore by there being the gas that the gasification carbon support forms in the situation of oxygen.For smelting reduction process, this producer gas is cooled to optimum reduction temperature and dedusting at it before with the reduced oxide siderophore as reducing gas.
Reducing gas be under it helps with the reduction of oxide compound siderophore, and himself oxidized gas.
Utilizing washer by the mud that obtains in the gas, is the waste water generation by the aftertreatment washer, and the dust settling that wherein washes out is mud.This mud is discharged, and prepares for the present invention by at least part of dehydration.Randomly, dehydration also can comprise heated drying.
If have mud in comprising in particulate oxide compound siderophore, the mixture as the wilkinite of binding agent and water of the inventive method, the water in the mixture is at least part of can be incorporated in the mixture by mud.Correspondingly select the degree of dehydration of mud.
According to a preferred implementation, mixture is heated during the kneading process.This for example can pass through the indirect heating of kneading device shell, or open steam heats to implement.
Test sequence number 1 and sequence number 4 compare and show at kneading process heating mixture, to have positive effect for obvious raising point Compressive Strength in the table 1.
In principle, can be with particulate with by the DRI of pig iron material-for example by the inventive method, the fine particle materials exploitation that generates in the processing step of preparation steel is for the production of the pig iron and steel.By the material circulation, starting material are transformed into the finished product with higher proportion, so they are in fact more cheap.The waste treatment that the material of DRI, the pig iron or the steel factory that utilizes when the pressed compact produced according to the invention for particulate and other so far must be taken into account or return transportation cost and will be eliminated.
In addition, the inventive method also has following advantage, can obtain more quickly pressed compact with comparing by slaking.
Embodiment
In conjunction with following illustrative diagram, embodiment of the present invention is described in detail.
Fig. 1 has schematically shown the present invention with equipment of direct reduction embodiment as an example.
Fig. 2 has schematically shown the present invention with melting and reducing equipment embodiment as an example.
Fig. 1 has schematically shown equipment of direct reduction.The chunky portions of oxide compound siderophore 1 is reduced into the iron (DRI) of direct-reduction by reducing gas 3 in having the direct-reduction shaft furnace 2 of fixed bed.Behind process compaction apparatus 4, DRI transports to the human consumer with the form of hot wafering iron (HBI).The furnace top gas of being discharged by direct-reduction shaft furnace 2 is removed the dust of load in cleaning apparatus 10 (be gas scrubber at this).Before the chunky portions 1a with the oxide compound siderophore is dosed to direct-reduction shaft furnace 2, by sieving at screen cloth 5, from oxide compound siderophore 1, remove fine fraction 1b, this fine fraction is not suitable for direct-reduction shaft furnace 2.In Fig. 1, screen cloth is arranged on the position before next-door neighbour's direct-reduction shaft furnace 2; In principle, it can be arranged on any correct position on the oxide compound siderophore access path certainly.Randomly after the break process of shredder assembly (for the mark in Fig. 1 of purpose clearly), this fine fraction 1b is transported to mixing device 6.In mixing device 6, this fine fraction 1b with as the wilkinite 12 of binding agent, the fine material 7 that in the HBI screening plant 8 in compaction apparatus 4 downstreams, forms, from the retained material 9-of steel mill in the case for metallization Fe fine powder and iron scale-, with the mud 19 from cleaning apparatus 10, and water 11 mixes.Listed component in the mixture that makes in mixing device 6 merges in two steps.Particularly, at first in first step with the solid component of mixture-as the wilkinite 12 of binding agent, fine material 7, from the retained material 9 of steel mill, from the mud 19 of cleaning apparatus 10, merge and premix, in second step, add afterwards entry 11, in order to obtain doughy denseness.Before merging, from the mud 19 dehydrated and heated dryings of cleaning apparatus 10, for this step of purpose clearly not especially with figure labeling.In the first mixing tank of mixing device 6, after the solid component of combined mixture, in second mixing tank in the first mixing tank downstream, sneak into water 11.The powerful kneading 15 minutes in kneading device 13 of mixture with dough shape denseness.
Then mixture after the kneading is transported to pressing unit 14.Suppressing the product that obtains in pressing unit 14 is the pressed compact blank that still keeps soft.By 15 in air, depositing in the storage location, make the sclerosis of pressed compact blank proceed at least part of drying, thereby sclerosis form pressed compact.After implementing sclerosis by this way, the pressed compact that obtains by sclerosis is transported to direct-reduction shaft furnace 2.In direct-reduction shaft furnace 2, the pressed compact that makes according to the present invention is transformed in the mode identical with the chunky portions 1a of oxide compound siderophore.
Fig. 2 has schematically shown melting and reducing equipment.Among Fig. 2 with the similar unit of Fig. 1 be equipped with Fig. 1 in identical Reference numeral.The chunky portions of oxide compound siderophore 1 is added in the melting and reducing unit 16.This melting and reducing unit 16 comprises melting gasifier, and wherein carbon-containing carrier is vaporized in the situation that has oxygen 20, thereby obtains reducing gas.Reducing gas is directed in the shaft furnace of the chunky portions that contains oxide compound siderophore 1.When flowing through this shaft furnace, the chunky portions of oxide compound siderophore is at least part of to reduce.The material of prereduction is introduced into melting gasifier subsequently by this way, is reduced fully this its and melts.The liquid pig iron 17 that obtains takes out from melting gasifier.The furnace top gas 18 of being discharged by melting and reducing unit 16 is removed the dust of its load in cleaning apparatus 10 (be gas scrubber at this).The mud that forms when the producer gas of melting gasifier being discharged in order to prepare cold air is implemented wet dedusting uses in the same manner with mud 19, still it is not marked for purpose clearly.Before the chunky portions 1a with the oxide compound siderophore is dosed to melting and reducing unit 16, by sieving at screen cloth 5, from oxide compound siderophore 1, remove fine fraction 1b, this part is not suitable for melting and reducing unit 16.Randomly after the break process of shredder assembly (for the mark in Fig. 2 of purpose clearly), this fine fraction 1b is transported to mixing device 6.In mixing device 6, this fine fraction 1b with as the wilkinite 12 of binding agent, from the retained material 9-of steel mill in the case for metallization Fe fine powder and iron scale-, with from the mud of cleaning apparatus 10, and water 11 mixes.Component listed in the mixture that makes in mixing device 6 merges in two steps.Particularly, at first in first step with the solid component of mixture-as the wilkinite 12 of binding agent, fine material 23, from the retained material 9 of steel mill, from the mud 19-of cleaning apparatus 10, merge and premix, in second step, add afterwards entry 11, in order to obtain doughy denseness.Before merging, from the mud 19 dehydrated and heated dryings of cleaning apparatus 10, for this step of purpose clearly not especially with figure labeling.In the first mixing tank of mixing device 6, after the solid component of combined mixture, in second mixing tank in the first mixing tank downstream, add entry 11.The powerful kneading 15 minutes in kneading device 13 of mixture with dough shape denseness.
Then mixture after the kneading is transported to pressing unit 14.Suppressing the product that obtains in pressing unit 14 is the pressed compact blank that still keeps soft.By 15 in air, depositing in the storage location, make the sclerosis of pressed compact blank, at least part of drying of pressed compact wherein, thus sclerosis forms pressed compact.After implementing sclerosis by this way, the pressed compact that obtains by sclerosis is transported to melting and reducing unit 16.In melting and reducing unit 16, the pressed compact that makes according to the present invention is transformed in the mode identical with the chunky portions 1a of oxide compound siderophore.
Reference numerals list
1 oxide compound siderophore (oxidische
)
2 direct-reduction shaft furnaces
3 reducing gass
4 compaction apparatus
5 screen clothes
6 mixing devices
7 fine materials 7 (in the HBI screening plant 8 in compaction apparatus 4 downstreams, forming)
The 8HBI screening plant
9 retained materials from steel mill
10 cleaning apparatuss
11 water
12 binding agents (wilkinite)
13 kneading devices
14 pressing units
15 storage locations
16 melting and reducing unit
17 liquid pig irons
18 furnace top gas
19 mud
20 oxygen
Claims (8)
1. the method that is prepared the pressed compact of oxides-containing iron by the oxide compound siderophore of particulate, the method by preparation comprise the oxide compound siderophore of particulate, as the wilkinite of binding agent and the mixture of water, suppress described mixture, and the pressed compact blank sclerosis that obtains when suppressing is realized, it is characterized in that, mixture is merged by going through 3 minutes in its component at least, preferably at least 5 minutes, maximum 30 minutes, preferred maximum 20 minutes, particularly preferably maximum 15 minutes kneading processes is suppressed subsequently.
2. method as claimed in claim 1 is characterized in that described mixture comprises the wilkinite of 3-12 % by weight, take the amount of the oxide compound siderophore of particulate as the basis.
3. such as the method for claim 1 or 2, it is characterized in that described mixture also comprises the iron containing metallurgical retained material, be preferably at least a member in following group:
-metallization Fe fine powder,
-iron scale
-metallurgical dust
-metallurgical mud
-come from the material of process for making, utilized sponge iron and/or the pig iron by using pressed compact prepared in accordance with the present invention to obtain in this process for making.
4. such as the method for any one among the claim 1-3, it is characterized in that described mixture also contains fine grain rhombohedral iron ore and/or limonite material.
5. such as the method for any one among the claim 1-4, it is characterized in that, described mixture also contains the fine particle materials that forms in furnace top gas, reducing gas or the producer gas dust removal process at equipment, and described equipment is used for by reducing gas reduced oxide siderophore.
6. such as the method for any one among the claim 1-5, it is characterized in that the described mixture of heating in the kneading process.
7. the pressed compact that can obtain by the method such as claim 1-6 any one.
8. pressed compact as claimed in claim 7 is as the purposes of bulk oxide siderophore for the preparation of sponge iron or liquid pig iron.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0063610A AT509072B1 (en) | 2010-04-19 | 2010-04-19 | BENTONITE-BOUNDED PRESS LEGS BELOW OXIDIC ICE CARRIER |
| ATA636/2010 | 2010-04-19 | ||
| PCT/EP2011/054214 WO2011131433A1 (en) | 2010-04-19 | 2011-03-21 | Bentonite-bonded pressed articles from fine-grain oxidic iron carriers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102918169A true CN102918169A (en) | 2013-02-06 |
Family
ID=44122617
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011800201683A Pending CN102918169A (en) | 2010-04-19 | 2011-03-21 | Bentonite-bonded pressed articles from fine-grain oxidic iron carriers |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20130032005A1 (en) |
| EP (1) | EP2561107A1 (en) |
| JP (1) | JP2013525605A (en) |
| KR (1) | KR20130058693A (en) |
| CN (1) | CN102918169A (en) |
| AT (1) | AT509072B1 (en) |
| AU (1) | AU2011244599A1 (en) |
| BR (1) | BR112012026713A2 (en) |
| CA (1) | CA2796688A1 (en) |
| MX (1) | MX2012012186A (en) |
| RU (1) | RU2012148808A (en) |
| WO (1) | WO2011131433A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2631305A1 (en) * | 2012-07-09 | 2013-08-28 | Siemens VAI Metals Technologies GmbH | Combination of fluidised bed reduction method and direct reduction method |
| US9994928B2 (en) * | 2013-03-26 | 2018-06-12 | Posco | Method for recycling iron-containing by-products discharged from coal-based molten ironmaking process, system therefor, and reduced iron agglomeration system |
| MX2014014746A (en) * | 2014-12-03 | 2015-10-02 | D R &D Labs And Engineering S De R L De C V | Process for obtaining briquettes from pelelt fines, dri sludge, dri fines and dust from dri dusting for being industrially used in procceses for producing direct reduction iron. |
| WO2020122701A1 (en) * | 2018-12-12 | 2020-06-18 | Jesus R Cuauro Pulgar | Method for producing briquettes from pellet fines, dri sludge, dri fines and dust from dri dedusting systems, for industrial use in direct-reduced iron production processes |
| EP4163402A1 (en) * | 2021-10-07 | 2023-04-12 | voestalpine Texas LLC | Induction heating of dri |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2386073A (en) * | 1944-02-15 | 1945-10-02 | John H Stewart | Method of reducing ores and oxides |
| US3307927A (en) * | 1959-10-13 | 1967-03-07 | Muschenborn Walter | Process for the treatment of pulverulent material |
| GB1572566A (en) * | 1977-07-16 | 1980-07-30 | Sumitomo Heavy Industries | Process for producing reduced iron pellets from iron-containing dust |
| DE4416699A1 (en) * | 1993-06-04 | 1994-12-08 | Linde Ag | Process for the utilization of metallic residual material, in particular turnings material, in melting furnaces |
| US5395441A (en) * | 1992-10-19 | 1995-03-07 | Usx Corporation | Revert briquettes for iron making blast furnace |
| US5505903A (en) * | 1993-06-21 | 1996-04-09 | Voest-Alpine Industrieanlagenbau Gmbh | Method of producing cold-moulded iron-containing briquettes |
| CN1298028A (en) * | 1999-11-24 | 2001-06-06 | 侯德成 | Cooling and fluxing agent for steel smelting in converter |
| CN1365396A (en) * | 2000-04-10 | 2002-08-21 | 株式会社神户制钢所 | Method for producing reduced iron |
| CN1936041A (en) * | 2006-10-25 | 2007-03-28 | 张清学 | Steelsmelting dust-mud pelletizing slag-melting agent compounding method |
| CN101255484A (en) * | 2008-03-27 | 2008-09-03 | 彭海圣 | Composite cooling agent for steel-smelting and production technique thereof |
| CN101519722A (en) * | 2009-03-25 | 2009-09-02 | 韶关市曲江盛大工业物资有限公司 | Method for utilizing iron containing metallurgical dust |
| AT507261A1 (en) * | 2008-09-11 | 2010-03-15 | Siemens Vai Metals Tech Gmbh | PROCESS FOR THE PREPARATION OF AGGLOMERATES |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5226487B2 (en) * | 1973-07-25 | 1977-07-14 | ||
| JPS5760410B2 (en) * | 1974-09-04 | 1982-12-20 | Nitsushin Seiko Kk | |
| GB8918913D0 (en) * | 1989-08-18 | 1989-09-27 | Allied Colloids Ltd | Agglomeration of particulate materials |
| JPH06240372A (en) * | 1993-02-22 | 1994-08-30 | Saburo Maruseko | Pellet for iron making raw material and its production |
| TW357193B (en) * | 1996-11-11 | 1999-05-01 | Sumitomo Metal Ind | Manufacturing method of reduced iron and the apparatus |
| JP4220908B2 (en) * | 2004-01-16 | 2009-02-04 | 株式会社神戸製鋼所 | Method for producing unfired agglomerated mineral |
| JP5114721B2 (en) * | 2006-04-03 | 2013-01-09 | 新日鐵住金株式会社 | Method for producing dust agglomerates |
| JP5000402B2 (en) * | 2006-09-11 | 2012-08-15 | 新日本製鐵株式会社 | Method for producing carbon-containing unfired pellets for blast furnace |
-
2010
- 2010-04-19 AT AT0063610A patent/AT509072B1/en not_active IP Right Cessation
-
2011
- 2011-03-21 US US13/642,193 patent/US20130032005A1/en not_active Abandoned
- 2011-03-21 MX MX2012012186A patent/MX2012012186A/en not_active Application Discontinuation
- 2011-03-21 RU RU2012148808/02A patent/RU2012148808A/en not_active Application Discontinuation
- 2011-03-21 AU AU2011244599A patent/AU2011244599A1/en not_active Abandoned
- 2011-03-21 EP EP11711804A patent/EP2561107A1/en not_active Withdrawn
- 2011-03-21 JP JP2013505379A patent/JP2013525605A/en active Pending
- 2011-03-21 CN CN2011800201683A patent/CN102918169A/en active Pending
- 2011-03-21 WO PCT/EP2011/054214 patent/WO2011131433A1/en active Application Filing
- 2011-03-21 BR BR112012026713A patent/BR112012026713A2/en not_active IP Right Cessation
- 2011-03-21 KR KR20127030285A patent/KR20130058693A/en not_active Application Discontinuation
- 2011-03-21 CA CA 2796688 patent/CA2796688A1/en not_active Abandoned
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2386073A (en) * | 1944-02-15 | 1945-10-02 | John H Stewart | Method of reducing ores and oxides |
| US3307927A (en) * | 1959-10-13 | 1967-03-07 | Muschenborn Walter | Process for the treatment of pulverulent material |
| GB1572566A (en) * | 1977-07-16 | 1980-07-30 | Sumitomo Heavy Industries | Process for producing reduced iron pellets from iron-containing dust |
| US5395441A (en) * | 1992-10-19 | 1995-03-07 | Usx Corporation | Revert briquettes for iron making blast furnace |
| DE4416699A1 (en) * | 1993-06-04 | 1994-12-08 | Linde Ag | Process for the utilization of metallic residual material, in particular turnings material, in melting furnaces |
| US5505903A (en) * | 1993-06-21 | 1996-04-09 | Voest-Alpine Industrieanlagenbau Gmbh | Method of producing cold-moulded iron-containing briquettes |
| CN1298028A (en) * | 1999-11-24 | 2001-06-06 | 侯德成 | Cooling and fluxing agent for steel smelting in converter |
| CN1365396A (en) * | 2000-04-10 | 2002-08-21 | 株式会社神户制钢所 | Method for producing reduced iron |
| CN1936041A (en) * | 2006-10-25 | 2007-03-28 | 张清学 | Steelsmelting dust-mud pelletizing slag-melting agent compounding method |
| CN101255484A (en) * | 2008-03-27 | 2008-09-03 | 彭海圣 | Composite cooling agent for steel-smelting and production technique thereof |
| AT507261A1 (en) * | 2008-09-11 | 2010-03-15 | Siemens Vai Metals Tech Gmbh | PROCESS FOR THE PREPARATION OF AGGLOMERATES |
| CN101519722A (en) * | 2009-03-25 | 2009-09-02 | 韶关市曲江盛大工业物资有限公司 | Method for utilizing iron containing metallurgical dust |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2013525605A (en) | 2013-06-20 |
| AT509072B1 (en) | 2011-06-15 |
| CA2796688A1 (en) | 2011-10-27 |
| MX2012012186A (en) | 2012-12-17 |
| BR112012026713A2 (en) | 2016-07-12 |
| KR20130058693A (en) | 2013-06-04 |
| AT509072A4 (en) | 2011-06-15 |
| WO2011131433A1 (en) | 2011-10-27 |
| AU2011244599A1 (en) | 2012-11-29 |
| US20130032005A1 (en) | 2013-02-07 |
| RU2012148808A (en) | 2014-05-27 |
| EP2561107A1 (en) | 2013-02-27 |
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