CN101903541A - Method for manufacturing binderless briquettes and apparatus for manufacturing the same - Google Patents
Method for manufacturing binderless briquettes and apparatus for manufacturing the same Download PDFInfo
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- CN101903541A CN101903541A CN2008801211500A CN200880121150A CN101903541A CN 101903541 A CN101903541 A CN 101903541A CN 2008801211500 A CN2008801211500 A CN 2008801211500A CN 200880121150 A CN200880121150 A CN 200880121150A CN 101903541 A CN101903541 A CN 101903541A
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- iron ore
- reducing iron
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- dust
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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
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The present invention relates to a method of manufacturing a binderless briquette and an apparatus for performing the same. The method of manufacturing the binderless briquette includes providing a dust gathered by using a dry collection manner from an offgas discharged when an iron ore is dried, providing a reduced iron ore discharged from an apparatus for manufacturing a molten iron including a reduction furnace providing a reduced iron obtained by reducing the dried iron ore and a melter-gasifier manufacturing the molten iron by melting the reduced iron, providing a sludge discharged from the apparatus for manufacturing the molten iron, providing a mixture formed by drying and mixing at least two sources selected from the group consisting of the dust, the reduced iron ore and the sludge and forming the binderless briquette by molding the mixture without adding a binder.
Description
Technical field
The present invention relates to a kind of equipment of making the method for binder free agglomerate and making the binder free agglomerate.More particularly, the present invention relates to method that dust that a kind of utilization produces or reduced iron make the binder free agglomerate and the equipment of making the binder free agglomerate when forming molten iron.
Background technology
When making molten iron, produce various byproducts.Under the situation that reclaims byproduct, because byproduct comprises carbon or iron, so the cost that can economize in raw materials greatly.Byproduct can be dust or reducing iron ore.
Can when making molten iron, reclaim dust to form pellet as binding agent by utilizing cement.Yet, because cement is used as binding agent, so need burn till (maturing) technology to pellet.In addition, if pellet is used for blast furnace, can produce a large amount of slags.
Summary of the invention
Technical problem
Embodiments of the invention relate to the method that dust that a kind of utilization produces or reduced iron are made the binder free agglomerate when forming molten iron.
Embodiments of the invention provide a kind of equipment of carrying out aforesaid method.
Technical scheme
According to embodiments of the invention, provide a kind of method of making the binder free agglomerate.This method may further comprise the steps: provide to utilize and do the dust that collection method is collected from exhaust gas discharged when iron ore is dried; Provide from the reducing iron ore of the equipment exhausting that is used to make molten iron, the equipment that is used to make molten iron comprises reduction furnace that the reduced iron that the iron ore by the reduction drying obtains is provided and the melting Gas-making Furnace of making molten iron by smelting reduction iron; The sludge that is used to make the equipment exhausting of molten iron from described is provided; Provide by drying and mix the mixture that at least two kinds of raw materials selecting form from the group of being made of described dust, described reducing iron ore and described sludge; Make mixture forming form the binder free agglomerate by not adding binding agent.
In the step of reducing iron ore is provided, reducing iron ore is being carried out providing reducing iron ore after drying and the size separation.Before reducing iron ore was carried out drying and size separation, reducing iron ore comprised about 10wt% to the interior moisture of the scope of about 30wt%.The reduction ratio of reducing iron ore is about 30% to about 60%.Reducing iron ore is carried out size separation,, thick reducing iron ore is filled into the melting Gas-making Furnace reducing iron ore is divided into thick reducing iron ore and smart reducing iron ore.The diameter of thick reducing iron ore is greater than about 8mm.
In the step that forms the binder free agglomerate, when making mixture forming, forming pressure is that about 6t/cm is to about 10t/cm.In the step of mixture was provided, the amount of the moisture in the reducing iron ore was about 0 to about 6wt%.In the step of mixture was provided, the diameter of reducing iron ore was that about 1mm is to about 5mm.
In the step of mixture was provided, the amount of mixing the dust of species was about 0 to about 50wt%.In the step of reducing iron ore is provided, provide reducing iron ore from reduction furnace.In the step of reducing iron ore is provided, the equipment that is used to make molten iron comprises that also foundary weight forms device, foundary weight formation device is with reduction furnace and the melting Gas-making Furnace is connected to each other and will be fed to the melting Gas-making Furnace by pushing the foundary weight that forms from the reduced iron of reduction furnace discharging, forms the device provisioning reducing iron ore from foundary weight.
In the step that forms the binder free agglomerate, the intensity of binder free agglomerate is that about 80kgf/p is to about 100kgf/p.In the step of sludge is provided, after being dried and being broken, sludge provides sludge.Before sludge was dried also fragmentation, sludge comprised the moisture of about 30wt% to about 40wt%.
In the step of mixture is provided, form mixture by mixing dust, reducing iron ore and sludge, the amount of sludge is about 0 to about 55wt% in the mixture.The amount of reducing iron ore and the amount of dust are basic identical.
In the step of mixture is provided, form mixture by mixing dust and sludge, the content of dust is that about 70wt% is to about 100wt% in the mixture.In the step of mixture is provided, form mixture by mixing reducing iron ore and sludge, the content of reducing iron ore is that about 70wt% is to about 100wt% in the mixture.In the step of mixture is provided, mixture is heat-treated to about 400 ℃ temperature with about 350 ℃.
According to embodiments of the invention, provide a kind of equipment that is used to make the binder free agglomerate.This equipment comprises: the dust hopper, collect the dust of dust and store collected from exhaust gas discharged when the dry iron ore by utilizing dried collection mode; The reducing iron ore hopper, storage is from the reducing iron ore of the equipment exhausting that is used to make molten iron, and the described equipment that is used to make molten iron comprises reduction furnace that the reduced iron that the iron ore by the reduction drying obtains is provided and the melting Gas-making Furnace of making molten iron by smelting reduction iron; The sludge hopper stores the sludge that is used to make the equipment exhausting of molten iron from described; Mixing tank is connected to dust hopper, reducing iron ore hopper and sludge hopper, and at least two kinds of raw materials dry and that mixing is selected from the group of being made up of described dust, described reducing iron ore and described sludge form mixture; A pair of forming roll forms the binder free agglomerate to mixture forming.
Mixing tank comprises housing and the rotating member that rotates in housing.Rotating member is along the spiral member of pre-determined direction extension to rotate in housing.
Described equipment also comprises: moisture eliminator, dry sludge; Destroyer is connected to each other moisture eliminator and sludge and broken sludge.Moisture eliminator is a rotary kiln.
Described equipment also comprises: moisture eliminator, dry reducing iron ore; The size separation device is connected to each other moisture eliminator and reducing iron ore hopper, and the reducing iron ore of drying is carried out size separation is divided into smart reducing iron ore and thick reducing iron ore with the reducing iron ore with drying.Moisture eliminator is a rotary kiln.
Thick reducing iron ore is filled into the melting Gas-making Furnace.Reduction furnace is fed to the reducing iron ore hopper with reducing iron ore.
Mixture is heat-treated to about 400 ℃ temperature with about 350 ℃.The equipment that is used to make molten iron comprises also reduction furnace and melting Gas-making Furnace foundary weight connected to one another is formed device that reducing iron ore forms device provisioning to the reducing iron ore hopper from foundary weight.
Described a pair of forming roll makes described mixture forming with the forming pressure of the extremely about 10t/cm of about 6t/cm.Reduction furnace is fluid bed reduction reactor or packed-bed reactor.
Beneficial effect
Can be recovered in the byproduct (for example, dust, sludge or reducing iron ore) that produces when making molten iron.Therefore, raw materials cost is minimized.In addition, the agglomerate that utilizes dust, sludge or reducing iron ore to form can at high temperature have higher intensity, makes agglomerate can be filled into effectively in the melting Gas-making Furnace to make molten iron.
Description of drawings
Fig. 1 schematically shows the equipment that is used to make the binder free agglomerate according to first embodiment of the invention.
Fig. 2 schematically shows the equipment that is used to make the binder free agglomerate according to second embodiment of the invention.
Fig. 3 shows the equipment that is used to make molten iron, and wherein, this equipment exhausting is fed to being used among Fig. 1 and Fig. 2 and makes the raw material of the equipment of binder free agglomerate.
Fig. 4 schematically shows the ore drying installation of discharging dust.
Fig. 5 schematically shows the fluid bed reduction reactor of discharging reduced iron ore and sludge.
The foundary weight (compacted iron) that Fig. 6 schematically shows the discharging reduced iron ore forms device.
Fig. 7 schematically shows the hold-up vessel of discharging sludge.
Fig. 8 schematically shows the equipment that is used to make molten iron of discharging reduced iron ore and sludge.
Fig. 9 to Figure 17 illustrates according to the graphic representation of example 1 to the variation of the ultimate compression strength of the binder free agglomerate of example 12.
Embodiment
The present invention, embodiments of the invention shown in the drawings are described hereinafter with reference to the accompanying drawings more fully.Yet the present invention can implement with different forms, is confined to embodiment set forth herein and should not be construed as.On the contrary, provide these embodiment to make that the disclosure will be sufficient with completely, and will convey to those skilled in the art to scope of the present invention fully.Identical label is represented components identical all the time.
The whole terms that comprise technical term and scientific terminology used herein have the meaning equivalent in meaning with those skilled in the art institute common sense.It will also be appreciated that these terms (term that for example defines) should be understood that to have the meaning of the aggregatio mentium in the context with the disclosure and association area in universaling dictionary, and should be not ideally or too formally explain their meaning.
The binder free agglomerate is not need to add the agglomerate that binding agent forms.Therefore, when forming agglomerate, can not need optionally to add binding agent.
Fig. 1 schematically shows the equipment 10 according to the manufacturing binder free agglomerate of first embodiment of the invention.
As shown in Figure 1, the equipment 10 that is used to make the binder free agglomerate comprises: reducing iron ore hopper 101, dust hopper 102, mixing tank 108 and former 110.In addition, the equipment 10 that is used to make the binder free agglomerate also can comprise size separation device 105 and warehouse 106 and 107.
To be fed to reducing iron ore hopper 101 by the reducing iron ore of the equipment 1000 (see figure 3)s discharging that is used to make molten iron.Reducing iron ore is stored in the reducing iron ore hopper 101.Reducing iron ore can be remet.Can form reducing iron ore by making reduction of iron ore.Reducing iron ore can comprise the iron ore of complete reductive iron ore and partial reduction.
The reduction ratio of reducing iron ore can be about 30% to about 60%.When the reduction ratio of reducing iron ore less than surpassing about 30% or 60% the time, can effectively not form the binder free agglomerate greater than about.When making molten iron, can when making reduction of iron ore or when the extruding direct-reduced iron, form reducing iron ore.Reducing iron ore can partly be reduced when making molten iron and the reductive ore can again be oxidized when molten iron cools off subsequently.Therefore, reduced iron can have above-mentioned reduction ratio.
Reducing iron ore can be from the discharging of the different piece equipment 1000 (see figure 3)s of making molten iron.Because reducing iron ore is from different partial discharges and mix subsequently, thus the size of reducing iron ore is irregular and reduced iron in moisture content big relatively.Therefore, reducing iron ore cannot be directly as the raw material of making the binder free agglomerate.Therefore, before reduced iron is used to make the binder free agglomerate, but can be with the dry also size of sorting reduced iron of reducing iron ore.
Dust is fed to dust hopper 102.Dust is stored in the dust hopper 102 subsequently.When dry iron ore or when carrying iron ore, form dust.Specifically, can utilize dried collection process to collect dust from exhaust gas discharged when the dry iron ore.To be fed to dust hopper 102 by the dust that dried collection process is collected subsequently.Dust can be fed to dust warehouse 107 from dust hopper 102.Dust is stored in the dust warehouse 107 subsequently.
As mentioned above, can be directly used in from the reducing iron ore of the equipment 1000 (see figure 3)s discharging that is used for making molten iron or dust and to be manufactured on the binder free agglomerate that the equipment 1000 that is used to make molten iron uses, make and compare that raw material efficient can maximize with the situation that stack reducing iron ore or dust ground on the scene.
As shown in Figure 1, can be with rotary kiln as moisture eliminator 104.Alternatively, can use the moisture eliminator of other type.Moisture eliminator 104 can utilize the dry reducing iron ore that fills into moisture eliminator 104 of hot blast.That is, moisture eliminator 104 can arrive moisture eliminator 104 inside along direction of arrow rotation and with hot blast feeding.Reducing iron ore is filled in the moisture eliminator 104.Fill into reducing iron ore in the moisture eliminator 104 by warm air drying, then from moisture eliminator 104 dischargings.
The temperature moisture content of regulating reducing iron ore by the control hot blast.Before the equipment 1000 (see figure 3)s discharging that is used to make molten iron, reducing iron ore can have about 10wt% to the about moisture content of 30wt% at reducing iron ore.Under the relatively little situation of the moisture content of reducing iron ore, the intensity of agglomerate is relatively little, makes that agglomerate can be damaged easily.On the other hand, under the big relatively situation of the moisture content of reducing iron ore, reducing iron ore can become pulpous state, thereby can not form agglomerate effectively.Therefore, can utilize moisture eliminator 104 suitably to regulate the moisture content of reducing iron ore.
As shown in Figure 1, the reducing iron ore with drying is transported to size separation device 105.Size separation device 105 is connected to the size (for example, diameter) of moisture eliminator 104 with the sorting reducing iron ore.Irregular from the size of the molten pig ore of the equipment 1000 (see figure 3)s discharging that is used to make molten iron.Therefore, can utilize size separation device 105 to regulate the size of reducing iron ore, make the size of reducing iron ore become even relatively.
As shown in Figure 1, smart reducing iron ore is supplied to reducing iron ore warehouse 106, and reducing iron ore is stored in the reducing iron ore warehouse 106 subsequently.Reducing iron ore and dust can discharge from reducing iron ore warehouse 106 and dust warehouse 107 respectively, and are transported to mixing tank 108 subsequently.
As shown in Figure 1, mixing tank 108 comprises housing 1081 and spiral member 1083.Spiral member 1083 can extend with rotation along pre-determined direction in housing 1081.Therefore, spiral member 1083 can be carried mixing to former 110 from the reducing iron ore of reducing iron ore warehouse 106 and dust warehouse 107 dischargings and dust respectively.Can utilize mixing tank 108 to make reducing iron ore and dust drying.
As shown in Figure 1, will and mix reducing iron ore and the mixture of dust gained is transported to former 110 by drying.Former 110 can comprise hopper 1100, screw rod 1102 and a pair of forming roll 1104.Former 110 also can comprise hydraulic efficiency plant (not shown) and the load unit (not shown) that is installed to a pair of forming roll 1104, to make mixture forming under the constant compression force relatively.
Mixture is transported in the hopper 1100 and mixture is temporarily stored subsequently in hopper 1100.Screw rod 1102 along direction of arrow rotation will temporarily be stored in mixture forced discharge in the hopper 1100 in the gap between a pair of forming roll 1104.A pair of forming roll 1104 can rotate in opposite direction.A pair of forming roll 1104 can be made agglomerate by cold formation technology.
Fig. 2 schematically shows the equipment according to the manufacturing binder free agglomerate of second embodiment of the invention.The structure of the equipment 12 of the manufacturing binder free agglomerate among Fig. 2 is similar to the equipment 10 of the manufacturing binder free agglomerate of Fig. 1.Therefore, indicate identical parts and will omit any further instruction with identical label.
As shown in Figure 2, the equipment 12 of manufacturing binder free agglomerate comprises sludge hopper 103, moisture eliminator 114, warehouse 108 and destroyer 116.In addition, the equipment 12 of making the binder free agglomerate comprise with Fig. 1 in the different mixing tank 109 of mixing tank 108 structures.The parts that comprise in the equipment 10 of other parts that comprise in the equipment 12 of manufacturing binder free agglomerate and the manufacturing binder free agglomerate of Fig. 1 are basic identical.
The sludge of collecting from fluid bed reduction reactor 20 (see figure 3) exhaust gas discharged is supplied to sludge hopper 103.Sludge is stored in the sludge hopper 103 subsequently.Sludge can have and is lower than 5% reduction ratio.Sludge can comprise a certain amount of carbon.Carbon can be used as the lubricant of making in the binder free agglomerate process, to reduce the intensity of binder free agglomerate.The part of iron ore changes magnetite into from rhombohedral iron ore in the fluid bed reduction reactor.The part of iron ore is discharged to become the source of sludge with the form of dust.Therefore, the dust that comprises in the sludge can comprise crackle and cause volumetric expansion.Therefore, the volume density of sludge is lower than the volume density of dust.
Sludge be dried and fragmentation before, sludge has the moisture that content is 30wt% to 40wt%.Comprise at sludge under the situation of moisture of relatively small amount, the intensity of the binder free agglomerate that is formed by subsequent technique is too little, makes that the binder free agglomerate can be frangible relatively.On the other hand, comprise at sludge under the situation of a large amount of relatively moisture, can not form the binder free agglomerate effectively.Therefore, can utilize moisture eliminator 114 suitably to regulate the content of the moisture in the sludge.
Moisture eliminator 114 can be a rotary kiln.Alternatively, can use other moisture eliminator to substitute rotary kiln.The sludge drying that moisture eliminator 114 can utilize hot blast to make to fill in the moisture eliminator 114.Moisture eliminator 114 can rotate along the direction of arrow.Inside to moisture eliminator 114 provides hot blast.The temperature of may command hot blast is regulated the content of the moisture in the sludge.Sludge is filled in the moisture eliminator 114.Fill into sludge in the moisture eliminator 114 by warm air drying, then from moisture eliminator 114 dischargings.
Destroyer 116 is broken through the exsiccant sludge.Can make the sludge drying to have block shape.Therefore, need utilize destroyer 116 to make the sludge fragmentation so that sludge has the predetermined size that is suitable for making the binder free agglomerate.The sludge of fragmentation is fed to sludge warehouse 108, and the sludge with fragmentation is stored in the sludge warehouse 108 then.
As mentioned above, reducing iron ore, dust or the sludge that discharges from equipment 1000 (see figure 3)s of making molten iron can be directly used in and be manufactured on the binder free agglomerate that uses the equipment 1000 of making molten iron, thereby compare with the situation that reducing iron ore, dust or sludge are piled up in the place, can make the raw material maximizing efficiency.Reducing iron ore, dust and sludge discharge from reduced iron warehouse 106, dust warehouse 107 and sludge warehouse 108 respectively, and are transported to mixing tank 109.
Here, do not need reducing iron ore, dust and sludge all as the raw material of making the binder free agglomerate.As an example, can use reducing iron ore and dust to make the binder free agglomerate.As another example, can use dust and sludge to make the binder free agglomerate.As another example, can use sludge and reducing iron ore to make the binder free agglomerate.
As shown in Figure 2, mixing tank 109 comprises housing 1091 and rotating member 1093.Rotating member 1093 extends in housing 1091 vertically with rotation.Therefore, rotating member 1093 can mix and heat reducing iron ore, dust and the sludge that discharges from reducing iron ore, dust and sludge respectively.In addition, rotating member 1093 can be carried reducing iron ore, dust and sludge in the process of mixing and heating reducing iron ore, dust and sludge to former 110.
As shown in Figure 2, be transported to former 110 by the mixture that mixes and heating reducing iron ore, dust and sludge obtain.Mixture is filled in the hopper 1100 and is temporarily stored subsequently in hopper 1100.The screw feeder 1102 that is installed in the hopper 1100 can be forced to fill in the gap between a pair of forming roll 1104 along direction of arrow rotation and with mixture.A pair of forming roll 1104 can rotate in opposite direction.A pair of forming roll 1104 can be made agglomerate by cold formation technology.Hereinafter, show forming process with reference to Fig. 3 to Fig. 8 as reducing iron ore, dust and the sludge of the raw material of binder free agglomerate.
Fig. 3 shows the equipment 1000 that is used to make molten iron, be fed to being used among Fig. 1 make the equipment of binder free agglomerate and Fig. 2 be used to make the raw material of equipment of binder free agglomerate from being used to make equipment 1000 dischargings of molten iron.
As shown in Figure 3, the equipment 1000 that is used to make molten iron comprises that fluid bed reduction reactor 20, foundary weight form device 30, melting Gas-making Furnace 60, reducing gas supply line 70 and ore drying installation 80.In addition, the equipment 1000 that is used to make molten iron also comprises hot pressing equilibrator 40 and hold-up vessel 50.The equipment 1000 that is used to make molten iron also can comprise required device.
As shown in Figure 3, ore drying installation 80 can dry fill into the iron ore of fluid bed reduction reactor 20.Under the big relatively situation of moisture content in iron ore, iron ore can be in fluid bed reduction reactor 20 fluidisation and be attached to the inboard of fluid bed reduction reactor 20.Therefore, can make iron ore fluidisation effectively in fluid bed reduction reactor 20 by predrying iron ore in ore drying installation 80.
As shown in Figure 3, fluid bed reduction reactor 20 can comprise first fluidized bed 20a, the second fluidized-bed 20b, the 3rd fluidized-bed 20c and the 4th fluidized-bed 20d.First fluidized bed 20a, the second fluidized-bed 20b, the 3rd fluidized-bed 20c and the 4th fluidized-bed 20d sequentially are connected.Fluid bed reduction reactor 20 receives reducing gas and makes reduction of iron ore from melting Gas-making Furnace 60 by reducing gas supply line 70.First fluidized bed 20a receives the iron ore of drying and utilizes reducing gas preheating iron ore from ore drying installation 80.But the second fluidized-bed 20b and the 3rd fluidized-bed 20c prereduction are through the iron ore of preheating.The 4th fluidized-bed 20d can finally reduce iron ore through prereduction to form meticulous direct-reduced iron.
Fluid bed reduction reactor 20 can be transferred to meticulous direct-reduced iron foundary weight and form device 30.Foundary weight forms device 30 can push meticulous direct-reduced iron.Meticulous direct-reduced iron is directly being filled under the situation of melting Gas-making Furnace 60, meticulous direct-reduced iron can outwards be disperseed by the reducing gas in the melting Gas-making Furnace 60.In addition, meticulous direct-reduced iron is directly filled in the melting Gas-making Furnace 60, can make the air cycle deterioration in the melting Gas-making Furnace 60.Therefore, utilize foundary weight to form device 30 meticulous direct-reduced iron is formed foundary weight.Then foundary weight is fed to melting Gas-making Furnace 60.
As shown in Figure 3, foundary weight formation device 30 comprises hold-up vessel 301, pair of rolls 302, destroyer 304 and foundary weight hold-up vessel 306.But the direct-reduced iron that hold-up vessel 301 temporarily storeds are meticulous.Meticulous direct-reduced iron can discharge and utilize pair of rolls 302 to be converted to from hold-up vessel 301 has the foundary weight of being with the shape shape.Destroyer 304 can broken foundary weight so that have the fixed size through the foundary weight of fragmentation.Foundary weight through fragmentation is stored in the foundary weight hold-up vessel 306.
Hot pressing equilibrator 40 can make foundary weight form device 30 and hold-up vessel 50 is connected to each other.Hot pressing equilibrator 40 can be regulated the pressure between foundary weight formation device 30 and the hold-up vessel 50, is delivered to hold-up vessel 50 forcibly so that foundary weight is formed device 30 from foundary weight.Hold-up vessel 50 stores foundary weight and foundary weight is fed to melting Gas-making Furnace 60.
Foundary weight is filled in the melting Gas-making Furnace 60 and fusing subsequently.The carbon material of caking is filled in the melting Gas-making Furnace 60, thus can be at the melting Gas-making Furnace 60 inner coal packed beds that form.Here, the carbon material of caking can be lump coal or coal agglomerate (coal briquette).With oxygen injection in melting Gas-making Furnace 60 so that coal packed bed burning.Foundary weight is by the heat melts that obtains by the coal combustion packed bed.Foundary weight is melted to form molten iron, and molten iron is outwards discharged subsequently.To be fed to fluid bed reduction reactor 20 from the reducing gas that the coal packed bed produces by reducing gas supply line 70.
As shown in Figure 3, by dust supply line 90 dust is fed to the equipment 10 that is used to make the binder free agglomerate from ore drying installation 80.When being dried, iron ore done collection to assemble dust from ore drying installation 80 exhaust gas discharged.The dust of Shou Jiing is supplied to the equipment 10 that is used to make the binder free agglomerate by dust supply line 90 by the way.In addition, the reducing iron ore that produces from the equipment 1000 that is used to make molten iron is collected and is supplied to the equipment 10 that is used to make the binder free agglomerate by reducing iron ore supply line 85 subsequently.The sludge that produces from the equipment 1000 that is used to make molten iron is collected and is supplied to the equipment 10 that is used to make the binder free agglomerate by sludge supply line 95 subsequently.Hereinafter, describe from the process of equipment 1000 discharging reduced iron ores, dust and the sludge that is used to make molten iron with reference to Fig. 3 to Fig. 8.
Fig. 4 schematically shows the ore drying installation 80 among Fig. 3, and dust is from 80 dischargings of ore drying installation.Discharge process among Fig. 4 is not limit example of the present invention.Therefore, dust can be by another discharge process discharging.
As shown in Figure 4, ore drying installation 80 can comprise ore moisture eliminator 801, tornado dust collector 804, rear portion strainer 808, burner 809 etc.Can provide coke-oven gas (COG) and air with dry iron ore to ore moisture eliminator 801.The iron ore of drying is delivered to warehouse 802 from moisture eliminator 801, and the iron ore of drying is stored in the warehouse 802.To be stored in ferrolite supply in the warehouse 802 to fluid bed reduction reactor 20 (see figure 3)s.
Burn by burner 809 from ore moisture eliminator 801 exhaust gas discharged.Therefore, thus burned removal fine powder ore deposit, fine powder ore deposit.Yet unburned fine powder ore deposit also is included in the waste gas and it is supplied in the tornado dust collector 804 with waste gas.Here, for example, the fine powder ore deposit that can utilize gravity to make diameter surpass about 1.5 μ m is separated to the bottom of tornado dust collector 804.Isolating fine powder ore deposit utilizes travelling belt 806 to carry to be stored in the warehouse 802 along the direction of arrow.
Be transported to rear portion strainer 808 from tornado dust collector 804 exhaust gas discharged.The dust of not collected by tornado dust collector 804 that is included in the waste gas can be collected in rear portion strainer 808.For example, dust can have the diameter less than about 1.5 μ m.The dust of collecting in the rear portion strainer 808 can be collected and be transported to the equipment that is used to make the binder free agglomerate by second travelling belt 807 subsequently.Therefore, the equipment 10 that is used to make the binder free agglomerate can utilize dust to make agglomerate.
Fig. 5 schematically shows the fluid bed reduction reactor 20 among Fig. 3, and reducing iron ore and sludge are from 20 dischargings of fluid bed reduction reactor.
Can provide reducing iron ore from fluid bed reduction reactor 20.Fluid bed reduction reactor 20 can make reduction of iron ore.Under the situation of maintenance fluid bed reduction reactor 20, the operation of fluid bed reduction reactor 20 stops and can being emitted on accumulative reducing iron ore in the fluid bed reduction reactor 20.
For example, as shown in Figure 5, the 4th fluid bed reduction reactor 20d can utilize the bellows that are positioned at the 4th fluid bed reduction reactor 20d below to come the discharging reduced iron ore.Reducing iron ore is stored in the temporarily stored jar 200 and utilizes water cooling.Reducing iron ore is fed to the equipment that is used to make the binder free agglomerate by reducing iron ore supply line 85 then.
Waste gas discharges from first fluidized bed reduction reactor 20a by offgas line 22.Waste gas comprises a certain amount of dust, thereby at offgas line 22 places gas scrubber 24 is installed, and gas scrubber 24 is to exhaust blast water, to remove dust.With the outside discharging of the waste gas of having removed dust or once more used as reducing gas.Under the situation of gas scrubber 24 injection waters, the water that has absorbed dust can be used as sludge and outwards discharges.Can sludge be fed to the equipment 10 that is used to make the binder free agglomerate by sludge supply line 95.
The foundary weight that Fig. 6 schematically shows Fig. 3 forms device 30, and reducing iron ore forms device 30 dischargings from foundary weight.
As shown in Figure 6, under the situation of utilizing destroyer 304 broken foundary weight, foundary weight is broken to produce dust, that is, and and reducing iron ore.Therefore, can reducing iron ore be fed to the equipment 10 that is used to make the binder free agglomerate from destroyer 304 by reducing iron ore supply line 85.
Because meticulous direct-reduced iron is filled into hold-up vessel 301, can outwards discharge from hold-up vessel 301 so comprise the waste gas of a certain amount of dust.Therefore, utilize from the water of washer 32 supplies and remove dust, waste gas outwards can be discharged then.The water that comprises dust can become sludge in washer 32.Can sludge be fed to the equipment 10 that is used to make the binder free agglomerate by sludge supply line 95.
In addition, meticulous direct-reduced iron is pushed also moulding to produce waste gas by pair of rolls 302.Here, waste gas can comprise a certain amount of dust.Therefore, gas scrubber 34 can eject water to waste gas to remove dust from waste gas.The water that comprises dust becomes sludge.Sludge is fed to the equipment 10 that is used to make the binder free agglomerate by sludge supply line 95 then.
The discharging reduced iron ore among Fig. 5 and Fig. 6 and the process of sludge are not limit example of the present invention.Therefore, can adopt another process to come discharging reduced iron ore and sludge.
Fig. 7 schematically shows the hold-up vessel 50 among Fig. 3, and sludge is from hold-up vessel 50 dischargings.
As shown in Figure 7, under foundary weight is filled into situation in the hold-up vessel 50, can be because foundary weight and in hold-up vessel 50, producing waste gas.Waste gas outwards discharges by the offgas line 52 that is connected to hold-up vessel 50.Waste gas comprises dust.Therefore, come to remove dust from washer 54 supplied water from waste gas.The water that comprises dust is collected as sludge.Sludge is fed to the equipment 10 that is used to make the binder free agglomerate by sludge supply line 95.
Fig. 8 schematically shows the equipment 2000 that is used to make molten iron, and reducing iron ore and sludge are from being used to make equipment 2000 dischargings of molten iron.Be used for making the structural similitude of equipment 1000 that is used to make molten iron of the structure of equipment 2000 of molten iron and Fig. 3.Therefore, will use the identical parts of identical label indication and will omit any further instruction.
As shown in Figure 8, the equipment 2000 that is used to make molten iron comprises packed bed reactor 58.Though not shown in Figure 8, the equipment 2000 that is used to make molten iron can comprise packed bed reactor and fluid bed reduction reactor simultaneously.In addition, the equipment 2000 that is used to make molten iron can comprise a plurality of packed bed reactors.
As shown in Figure 8, the reducing gas that produces from melting Gas-making Furnace 60 is fed to packed bed reactor 58 by reducing gas supply line 71.Iron ore is filled into packed bed reactor 58 change iron ore into reduced iron to utilize reducing gas.Reduced iron is filled into melting Gas-making Furnace 60 also to be melted to form molten iron.
The waste gas that produces from packed bed reactor 58 outwards discharges by offgas line 59.Washer 57 is installed in offgas line 59 places and washer 57 can eject water to waste gas.Comprise a certain amount of dust in the waste gas.Water can be collected dust, makes that dust can be from the form discharging of gas scrubber 57 with sludge.Sludge is fed to the equipment 10 that is used to make the binder free agglomerate by sludge supply line 95.
In addition, under the situation of maintenance packed bed reactor 58, packed bed reactor 58 becomes empty.Therefore, the reducing iron ore in the packed bed reactor 58 is outwards discharged.Reducing iron ore is fed to the equipment 10 that is used to make the binder free agglomerate by reducing iron ore supply line 85.Therefore, the equipment 10 that is used to make the binder free agglomerate can utilize reducing iron ore to make the binder free agglomerate.
Hereinafter, with reference to example the present invention is described more fully.Providing these examples will make the disclosure is completely and completely, and the present invention should not be understood that to be confined to example set forth herein.
Example
Utilize reducing iron ore and dust to make the experiment of binder free agglomerate as raw material
Analysis being used in Fig. 1 made the composition that comprises in dust that the equipment of binder free agglomerate uses and the reducing iron ore.List in the composition table 1 below of dust and reducing iron ore.
Table 1
[table 1]
[table]
| Composition | ?T-Fe | M-Fe | FeO | SiO 2 | Al 2O 3 | CaO | MgO | K 2O | Na 2O | C | S |
| Dust | ?53.39 | 0.018 | 0.13 | 5.30 | 2.92 | 3.51 | 0.80 | 0.039 | 0.041 | 1.00 | 0.041 |
| Reducing iron ore | 73.03 | 37.57 | 18.85 | 3.99 | 1.99 | 3.38 | 0.86 | 0.17 | 0.041 | 1.35 | 0.099 |
Disclosed as table 1, owing to reducing iron ore is partly reduced, so the iron level of reducing iron ore is higher.On the other hand, owing to collect dust when iron ore is dried, the composition of dust is basic identical with the composition that is included in the iron ore.
Having carried out various experiments utilizes dust and reducing iron ore to make good binder free agglomerate.Here, the binder free agglomerate can at high temperature have high strength, thereby when the binder free agglomerate was filled into the melting Gas-making Furnace, the binder free agglomerate can not separate by reduced gas.
Example 1
The mixture that a pair of forming roll 1104 essentially identical a pair of forming roll extruding among utilization and Fig. 1 and moulding comprise dust and reducing iron ore.Here, the diameter of reducing iron ore is less than about 5mm.The moment of controlling described a pair of forming roll changes forming pressure changeably and makes the binder free agglomerate.Measure the ultimate compression strength of binder free agglomerate.When making the binder free agglomerate, variable forming pressure is 4t/cm, 6t/cm, 8t/cm and 10t/cm.Measure the ultimate compression strength of the binder free agglomerate of each forming pressure relatively.
The result of example 1
Fig. 9 shows the variation according to the ultimate compression strength of the binder free agglomerate of example 1.The ultimate compression strength of in Fig. 9, representing the binder free agglomerate corresponding with each forming pressure with black circles or white circle.In addition, in Fig. 9 by utilizing least square method that the ultimate compression strength of binder free agglomerate is expressed as dotted line.
As shown in Figure 9, when moulding pressure when 4t/cm increases to 10t/cm, the ultimate compression strength of binder free agglomerate can linearly increase.Carrying the minimum value of the required ultimate compression strength of binder free agglomerate is about 50kgf/p.In addition, filled at the binder free agglomerate under the situation of melting Gas-making Furnace, when the ultimate compression strength of binder free agglomerate surpassed about 80kgf/p, separation rate reduced.Therefore, when the ultimate compression strength of binder free agglomerate surpasses about 80kgf/p, the binder free agglomerate can be filled into the melting Gas-making Furnace.That is, the ultimate compression strength of binder free agglomerate can be about 80kgf/p to about 100kgf/p.Under the big situation of the ultimate compression strength of binder free agglomerate, need big forming pressure, thereby the load that is applied to described a pair of forming roll can be excessive.
With reference to the dotted line among Fig. 9, the ultimate compression strength of 80kgf/p is corresponding with the forming pressure of 6t/cm.Therefore, forming pressure can be 6t/cm to 10t/cm.Under the too small situation of forming pressure, the ultimate compression strength of binder free agglomerate is too small, thereby the binder free agglomerate can not be filled into the melting Gas-making Furnace.On the other hand, under the excessive situation of forming pressure, thereby the load that is applied to described a pair of forming roll can excessively may damage forming roll.
Example 2
The mixture that a pair of forming roll 1104 essentially identical a pair of forming roll extruding among utilization and Fig. 1 and moulding comprise dust and reducing iron ore.Here, the forming pressure of described a pair of forming roll is about 6t/cm.The reducing iron ore that has different diameter by utilization is made the binder free agglomerate.Measure the ultimate compression strength of binder free agglomerate.By utilizing diameter less than about 1mm, make the binder free agglomerate less than about 5mm with less than the about reducing iron ore of 10mm.
Example 3
The mixture that a pair of forming roll 1104 essentially identical a pair of forming roll extruding among utilization and Fig. 1 and moulding comprise dust and reducing iron ore.Here, the forming pressure of described a pair of forming roll is about 10t/cm.Utilization has the reducing iron ore of different diameter and makes the binder free agglomerate.Measure the ultimate compression strength of binder free agglomerate.Utilize diameter less than about 1mm, make the binder free agglomerate less than about 5mm with less than the about reducing iron ore of 10mm.
The result of example 2 and example 3
Figure 10 is the graphic representation that illustrates according to the variation of the ultimate compression strength of the binder free agglomerate of example 2 and example 3.Square among Figure 10 is represented example 2.Circle among Figure 10 is represented example 3.In addition, in Figure 10 by utilizing least square method that the ultimate compression strength of binder free agglomerate is expressed as dotted line.The dotted line of below is represented example 2.The dotted line of top is represented example 3.
As shown in figure 10, when the diameter of reducing iron ore increased, the ultimate compression strength of binder free agglomerate reduced.In addition, when example 2 and example 3 were compared, the ultimate compression strength of the binder free agglomerate of the comparable example 3 of degree that the ultimate compression strength of the binder free agglomerate of example 2 reduces according to the increase of diameter was little according to the degree that the increase of diameter reduces.Therefore, under the little situation of forming pressure, the not conference of ultimate compression strength of binder free agglomerate is subjected to the influence of the diameter of reducing iron ore.
The diameter of reducing iron ore can be that about 1mm is to about 5mm.Diameter at reducing iron ore is too small, and (for example, less than about 1mm under) the situation, though the ultimate compression strength height of binder free agglomerate, the efficient of the diameter of sorting reducing iron ore reduces.In addition, consume lot of energy.On the other hand, under the excessive situation of diameter, the filling ratio step-down of the mixture when making the binder free agglomerate in the recessed portion of forming roll.Therefore, the technology of manufacturing binder free agglomerate becomes unstable.
Example 4
The mixture that comprises dust and reducing iron ore by 1104 essentially identical a pair of forming roll extruding of a pair of forming roll among utilization and Fig. 1 and moulding.Here, the moisture content change in the reducing iron ore.The content of the moisture that changes is 0wt%, 3wt%, 6wt%, 9wt%, 12wt% and 17.5wt%.Measure the ultimate compression strength of binder free agglomerate.
Example 5
The mixture that comprises dust and reducing iron ore by 1104 essentially identical a pair of forming roll extruding of a pair of forming roll among utilization and Fig. 1 and moulding.Here, the moisture content change in the reducing iron ore.The content of the moisture that changes is 0wt%, 3wt%, 6wt%, 9wt%, 12wt% and 17.5wt%.Measure the ultimate compression strength of binder free agglomerate.In example 5, use with example 4 in the different reducing iron ore of reducing iron ore.
The result of example 4 and example 5
Figure 11 is the graphic representation that illustrates according to the variation of the ultimate compression strength of the binder free agglomerate of example 4 and example 5.Circle among Figure 11 is represented example 4.Square among Figure 11 is represented example 5.In addition, in Figure 11, utilize least square method that the ultimate compression strength of binder free agglomerate is expressed as dotted line.
As shown in figure 11, when the moisture content in the reducing iron ore increased, the ultimate compression strength of binder free agglomerate is linear to be reduced.When the moisture content in the reducing iron ore increased, mixture was attached to the surface of a pair of forming roll to reduce shaping characteristic.Therefore, moisture content is controlled to be is lower than about 6wt%.During greater than about 6wt%, the ultimate compression strength of binder free agglomerate reduces greatly in moisture content.
Example 6
The mixture that comprises dust and reducing iron ore by 1104 essentially identical a pair of forming roll extruding of a pair of forming roll among utilization and Fig. 1 and moulding.Here, the moisture content in the reducing iron ore is about 0wt%.Increase with the content of reducing iron ore blended dust.The content of the moisture that increases is 0wt%, 20wt%, 40wt%, 60wt%, 80wt% and 100wt%.Measure the ultimate compression strength of binder free agglomerate.
Example 7
The mixture that a pair of forming roll 1104 essentially identical a pair of forming roll extruding among utilization and Fig. 1 and moulding comprise dust and reducing iron ore.Here, the moisture content in the reducing iron ore is about 3wt%.Increase with the content of reducing iron ore blended dust.The content of the moisture that increases is 0wt%, 20wt%, 40wt%, 60wt%, 80wt% and 100wt%.Measure the ultimate compression strength of binder free agglomerate.
The result of example 6 and example 7
Figure 12 is the graphic representation that illustrates according to the variation of the ultimate compression strength of the binder free agglomerate of example 6 and example 7.Circle among Figure 12 is represented example 6.Square among Figure 12 is represented example 7.In addition, in Figure 12 by utilizing least square method that the ultimate compression strength of binder free agglomerate is expressed as dotted line.
As shown in figure 12, when the content of dust increased, the ultimate compression strength of binder free agglomerate can reduce.Content at dust is lower than under the situation of about 50wt%, the ultimate compression strength of the binder free agglomerate that can obtain to suit.Under the situation of content greater than about 50wt% of dust, the ultimate compression strength of binder free agglomerate can reduce greatly.Therefore, be not suitable for this binder free agglomerate is applied to the melting Gas-making Furnace.
Utilize sludge to make the experiment of binder free agglomerate as raw material.
Analysis being used in Fig. 2 made the composition that comprises in sludge, dust and the reducing iron ore that the equipment of binder free agglomerate uses.The composition of sludge, dust and reducing iron ore is disclosed in the table 2 below.
Table 2
[table 2]
[table]
| Composition (wt%) | T-Fe | M-Fe | FeO | SiO 2 | Al 2O 3 | CaO | MgO | K 2O | Na 2O | C | S |
| Sludge | 50.93 | 2.86 | 22.49 | 5.28 | 4.05 | 3.67 | 1.00 | 0.12 | 0.045 | 10.3 | 0.19 |
| Dust | 53.39 | 0.018 | 0.13 | 5.30 | 2.92 | 3.51 | 0.80 | 0.039 | 0.041 | 1.00 | 0.041 |
| Reducing iron ore | 73.03 | 37.57 | 18.85 | 3.99 | 1.99 | 3.38 | 0.86 | 0.17 | 0.041 | 1.35 | 0.099 |
A small amount of sludge is reduced in the fluid bed reduction reactor.Reducing iron ore is partly reduced.The composition of sludge is similar substantially to the composition of reducing iron ore.The iron level of sludge and reducing iron ore is higher.Specifically, as shown in table 2, the iron level of sludge and reducing iron ore is respectively about 50.03wt% and about 73.39wt%.Owing to when iron ore is dried, collect dust, so dust can comprise and the essentially identical composition of the composition of iron ore.
As shown in table 2, sludge comprises the carbon of about 10.3wt%.Therefore, when under the state of cooling, making the binder free agglomerate, can in the binder free agglomerate, produce the crackle that causes by carbon.Therefore, the binder free agglomerate can have the relatively low ultimate compression strength of about 20kgf/p to about kgf/p.Therefore, sludge, dust and reducing iron ore are heated and mix, to make the binder free agglomerate.That is, the mixture that comprises sludge, dust and reducing iron ore is pushed and moulding, thereby make binder free agglomerate with suitable ultimate compression strength by a pair of forming roll 1104 essentially identical a pair of forming roll among utilization and Fig. 2.
Example 8
Manufacturing comprises the mixture of sludge, dust and reducing iron ore.Here, make the binder free agglomerate by the amount that changes the sludge that comprises in the mixture.Specifically, in the scope of the extremely about 80wt% of about 50wt%, change the amount of sludge, to make the binder free agglomerate.Measure the ultimate compression strength of binder free agglomerate.
The result of example 8
Figure 13 shows the variation according to the ultimate compression strength of the binder free agglomerate of the amount of the sludge in the example 8.
As shown in figure 13, when the amount of the sludge in being included in mixture increased, the ultimate compression strength of binder free agglomerate reduced gradually.Under the binder free agglomerate is filled into situation in the melting Gas-making Furnace, the ultimate compression strength that need suitably keep the binder free agglomerate with prevent the binder free agglomerate under comparatively high temps separately.Therefore, the amount of the sludge in the mixture is retained as and is lower than about 55wt%.Amount at sludge is higher than under the situation of about 55wt%, and the ultimate compression strength of agglomerate can reduce, thereby agglomerate can be unsuitable for using in the melting Gas-making Furnace.
Example 9
Manufacturing comprises the mixture of sludge, dust and reducing iron ore.Here, the ratio that is included in the amount of the amount of the reducing iron ore in the mixture and dust by change is made the binder free agglomerate.Specifically, when making the binder free agglomerate, the ratio that is included in the amount of the amount of the reducing iron ore in the mixture and dust changes to about 1/2 scope about 1/4.Measure the ultimate compression strength of binder free agglomerate.
The result of example 9
Figure 14 is the graphic representation that illustrates according to the variation of the ultimate compression strength of the binder free agglomerate of the ratio of the amount of amount that is included in the reducing iron ore in the mixture in the example 9 and dust.
As shown in figure 14, when the ratio of the relative dust of reducing iron ore increased, the ultimate compression strength of binder free agglomerate reduced.Fill at the binder free agglomerate under the situation of melting Gas-making Furnace, need suitably keep the ultimate compression strength of binder free agglomerate under comparatively high temps, to separate to prevent the binder free agglomerate.The ultimate compression strength of binder free agglomerate can be not less than about 80kgf/p.Therefore, can keep the amount of reducing iron ore so that the amount of the amount of reducing iron ore and dust is basic identical.That is, the ratio with the amount of reducing iron ore and dust remains about 1.
Example 10
Manufacturing comprises the mixture of sludge, dust and reducing iron ore.Make the binder free agglomerate by the Heating temperature that changes mixture.Specifically, change Heating temperature to about 400 ℃ scope at about 170 ℃ and make the binder free agglomerate.Measure the ultimate compression strength of binder free agglomerate.
The result of example 10
Figure 15 is the graphic representation that illustrates according to the variation of the ultimate compression strength of the binder free agglomerate of the Heating temperature of the mixture in the mixing tank in the example 10.
As shown in figure 15, the ultimate compression strength of binder free agglomerate increases.Under the binder free agglomerate fills into situation in the melting Gas-making Furnace, the ultimate compression strength that then needs suitably to keep the binder free agglomerate with prevent the binder free agglomerate under comparatively high temps separately.Therefore, can be by obtaining suitable ultimate compression strength to about 400 ℃ temperature heated mixt with about 350 ℃.Under being lower than about 350 ℃ temperature during thermally treated mixture, owing to provide enough cohesive forces from mixture, so the ultimate compression strength of binding agent agglomerate is less.In addition, under with the situation that is higher than about 400 ℃ of thermally treated mixtures, because mixture is attached to a pair of forming roll, so can not form the binder free agglomerate.
Example 11
Manufacturing comprises the mixture of dust and sludge.The mixture that a pair of forming roll 1104 essentially identical a pair of forming roll extruding among utilization and Fig. 2 and moulding comprise dust and sludge.Here, the forming pressure of described a pair of forming roll is about 10t/cm, and mold temperature is about 400 ℃.When making mixture, the amount that changes dust makes that the amount of dust is about 80wt%, 60wt%, 40wt% and 0wt%.The amount of the sludge corresponding with the amount of dust is controlled as and makes the amount of sludge become 20wt%, 40wt%, 60wt% and 100wt%.Utilize this mixture forming binder free agglomerate.Measure the ultimate compression strength of binder free agglomerate.
The result of example 11
Figure 16 is the graphic representation that illustrates according to the variation of the ultimate compression strength of the binder free agglomerate of the amount of the amount of the dust in the example 11 and sludge.
As shown in figure 16, when the amount of dust reduced, the ultimate compression strength of binder free agglomerate reduced.Yet when the amount of sludge was higher than about 60wt%, the ultimate compression strength of binder free agglomerate raise again.The ultimate compression strength of binder free agglomerate is no more than 100kgf/p.
Under the binder free agglomerate is filled into situation in the melting Gas-making Furnace, the ultimate compression strength that need suitably keep the binder free agglomerate with prevent the binder free agglomerate under comparatively high temps separately.The ultimate compression strength of binder free agglomerate can surpass about 80kgf/p.Therefore, as the with dashed lines indication, in the scope of the amount of the dust in the mixture between the extremely about 100wt% of about 70wt%.Amount at dust is lower than under the situation of about 70wt%, and the ultimate compression strength of binder free agglomerate meeting deterioration makes the binder free agglomerate can be unsuitable for being used for the melting Gas-making Furnace.
Example 12
Manufacturing comprises the mixture of reducing iron ore and sludge.The mixture that a pair of forming roll 1104 essentially identical a pair of forming roll extruding among utilization and Fig. 2 and moulding comprise dust and sludge.Here, the forming pressure of described a pair of forming roll is about 10t/cm, and mold temperature is about 400 ℃.When making mixture, the amount that changes reducing iron ore makes that the amount of dust is about 100wt%, 80wt%, 60wt%, 40wt% and 0wt%.The amount of the sludge corresponding with the amount of reducing iron ore is controlled as and makes the amount of sludge become 0wt%, 20wt%, 40wt%, 60wt% and 100wt%.Utilize this mixture forming binder free agglomerate.Measure the ultimate compression strength of binder free agglomerate.
The result of example 12
Figure 17 is the graphic representation that illustrates according to the variation of the ultimate compression strength of the binder free agglomerate of the amount of the amount of the reducing iron ore in the example 12 and sludge.
As shown in figure 17, when the amount of reducing iron ore reduced, the ultimate compression strength of binder free agglomerate reduced.In addition, be lower than under the situation of about 60wt% in the amount of reducing iron ore, the ultimate compression strength of binder free agglomerate is similar substantially.Under the binder free agglomerate is filled into situation in the melting Gas-making Furnace, the ultimate compression strength that need suitably keep the binder free agglomerate with prevent the binder free agglomerate under comparatively high temps separately.The ultimate compression strength of binder free agglomerate can be higher than about 80kgf/p.Therefore, as the with dashed lines indication, the amount of the reducing iron ore in the mixture can be at about 70wt% to the scope between about 100wt%.Amount at reducing iron ore is lower than under the situation of about 70wt%, and the ultimate compression strength of binder free agglomerate meeting deterioration makes the binder free agglomerate can be unsuitable for being used for the melting Gas-making Furnace.
Aforementioned is to explanation of the present invention, and should not be understood that to limit the present invention.Though described some embodiments of the present invention, do not break away from itself under the situation of novel teachings of the present invention and advantage, those skilled in the art expect the possible many modifications to embodiment easily.Therefore, these are revised and also are intended to be included in as in the scope of the present invention that limits in claims.Therefore, it should be understood that aforementioned is to explanation of the present invention, is confined to disclosed specific embodiment and should not be construed as, and the modification of disclosed embodiment and other embodiment intention are included in the scope of claims.The present invention is defined by the claims, and the equivalent of claims comprises therewith.
Claims (33)
1. method of making the binder free agglomerate, this method may further comprise the steps:
Provide by utilizing and do the dust that collection method is collected from exhaust gas discharged when iron ore is dried;
Provide from the reducing iron ore of the equipment exhausting that is used to make molten iron, the equipment that is used to make molten iron comprises reduction furnace that the reduced iron that the iron ore by the reduction drying obtains is provided and the melting Gas-making Furnace of making molten iron by smelting reduction iron;
The sludge that is used to make the equipment exhausting of molten iron from described is provided;
Provide by drying and mix the mixture that at least two kinds of raw materials selecting form from the group of being made of described dust, described reducing iron ore and described sludge;
Make mixture forming form the binder free agglomerate by not adding binding agent.
2. the method for claim 1, wherein in the step of reducing iron ore is provided, reducing iron ore is being carried out providing reducing iron ore after drying and the size separation.
3. method as claimed in claim 2, wherein, before reducing iron ore was carried out drying and size separation, reducing iron ore comprised about 10wt% to the interior moisture of the scope of about 30wt%.
4. method as claimed in claim 2, wherein, the reduction ratio of reducing iron ore is about 30% to about 60%.
5. method as claimed in claim 4 wherein, is carried out size separation to reducing iron ore, reducing iron ore is divided into thick reducing iron ore and smart reducing iron ore, thick reducing iron ore is filled into the melting Gas-making Furnace.
6. method as claimed in claim 5, wherein, the diameter of thick reducing iron ore is greater than about 8mm.
7. the method for claim 1, wherein in the step that forms the binder free agglomerate, when making mixture forming, forming pressure is about 6t/cm to about 10t/cm.
8. the method for claim 1, wherein in the step of mixture is provided, the amount of the moisture in the reducing iron ore is about 0 to about 6wt%.
9. the method for claim 1, wherein in the step of mixture is provided, the diameter of reducing iron ore is about 1mm to about 5mm.
10. the method for claim 1, wherein in the step of mixture is provided, the amount of mixing the dust of species is about 0 to about 50wt%.
11. the method for claim 1, wherein in the step of reducing iron ore is provided, provide reduced iron from reduction furnace.
12. the method for claim 1, wherein, in the step of reducing iron ore is provided, the equipment that is used to make molten iron comprises that also foundary weight forms device, foundary weight formation device is with reduction furnace and the melting Gas-making Furnace is connected to each other and will be fed to the melting Gas-making Furnace by pushing the foundary weight that forms from the reduced iron of reduction furnace discharging, forms the device provisioning reducing iron ore from foundary weight.
13. the method for claim 1, wherein in the step that forms the binder free agglomerate, the intensity of binder free agglomerate is that about 80kgf/p is to about 100kgf/p.
14. the method for claim 1, wherein in the step of sludge is provided, after sludge is dried and is broken, provide sludge.
15. method as claimed in claim 14, wherein, before sludge was dried also fragmentation, sludge comprised the moisture of about 30wt% to about 40wt%.
16. the method for claim 1, wherein in the step of mixture is provided, form mixture by mixing dust, reducing iron ore and sludge, the amount of sludge is about 0 to about 55wt% in the mixture.
17. method as claimed in claim 16, wherein, the amount of reducing iron ore and the amount of dust are basic identical.
18. the method for claim 1, wherein in the step of mixture is provided, form mixture by mixing dust and sludge, the content of dust is that about 70wt% is to about 100wt% in the mixture.
19. the method for claim 1, wherein in the step of mixture is provided, form mixture by mixing reducing iron ore and sludge, the content of reducing iron ore is that about 70wt% is to about 100wt% in the mixture.
20. the method for claim 1, wherein in the step of mixture is provided, mixture is heat-treated to about 400 ℃ temperature with about 350 ℃.
21. an equipment that is used to make the binder free agglomerate, this equipment comprises:
The dust hopper is collected the dust of dust and store collected by utilizing dried collection mode from exhaust gas discharged when the dry iron ore;
The reducing iron ore hopper, storage is from the reducing iron ore of the equipment exhausting that is used to make molten iron, and the described equipment that is used to make molten iron comprises reduction furnace that the reduced iron that the iron ore by the reduction drying obtains is provided and the melting Gas-making Furnace of making molten iron by smelting reduction iron;
The sludge hopper stores the sludge that is used to make the equipment exhausting of molten iron from described;
Mixing tank is connected to dust hopper, reducing iron ore hopper and sludge hopper, and at least two kinds of raw materials dry and that mixing is selected from the group of being made up of described dust, described reducing iron ore and described sludge form mixture;
A pair of forming roll makes mixture forming form the binder free agglomerate.
22. equipment as claimed in claim 21, wherein, mixing tank comprises:
Housing;
Rotating member rotates in housing.
23. equipment as claimed in claim 22, wherein, rotating member is along the spiral member of pre-determined direction extension to rotate in housing.
24. equipment as claimed in claim 21, described equipment also comprises:
Moisture eliminator, dry sludge;
Destroyer is connected to each other moisture eliminator and sludge and broken sludge.
25. equipment as claimed in claim 24, wherein, moisture eliminator is a rotary kiln.
26. equipment as claimed in claim 21, described equipment also comprises:
Moisture eliminator, dry reducing iron ore;
The size separation device is connected to each other moisture eliminator and reducing iron ore hopper, and the reducing iron ore of drying is carried out size separation is divided into smart reducing iron ore and thick reducing iron ore with the reducing iron ore with drying.
27. equipment as claimed in claim 26, wherein, moisture eliminator is a rotary kiln.
28. equipment as claimed in claim 26 wherein, fills into the melting Gas-making Furnace with thick reducing iron ore.
29. equipment as claimed in claim 21, wherein, reduction furnace is fed to the reducing iron ore hopper with reducing iron ore.
30. equipment as claimed in claim 21 wherein, is heat-treated mixture to about 400 ℃ temperature with about 350 ℃.
31. equipment as claimed in claim 21, wherein, the equipment that is used to make molten iron comprises also reduction furnace and melting Gas-making Furnace foundary weight connected to one another is formed device that reducing iron ore forms device provisioning to the reducing iron ore hopper from foundary weight.
32. equipment as claimed in claim 21, wherein, described a pair of forming roll makes described mixture forming with the forming pressure of the extremely about 10t/cm of about 6t/cm.
33. equipment as claimed in claim 30, wherein, reduction furnace is fluid bed reduction reactor or packed-bed reactor.
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| KR1020070132112A KR100929181B1 (en) | 2007-12-17 | 2007-12-17 | Manufacturing method of binderless briquette and apparatus for manufacturing same |
| KR10-2007-0132112 | 2007-12-17 | ||
| KR1020070134346A KR100929182B1 (en) | 2007-12-20 | 2007-12-20 | Binderless briquette manufacturing method and manufacturing apparatus |
| KR10-2007-0134346 | 2007-12-20 | ||
| PCT/KR2008/007469 WO2009078662A2 (en) | 2007-12-17 | 2008-12-17 | Method for manufacturing binderless briquettes and apparatus for manufacturing the same |
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| CN101903541A true CN101903541A (en) | 2010-12-01 |
| CN101903541B CN101903541B (en) | 2012-11-14 |
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| CN107723466A (en) * | 2017-09-21 | 2018-02-23 | 汶川县三力铁合金有限责任公司 | It is a kind of to make the method that adhesive is fine ore cold-press agglomeration using environmentally friendly ash |
| CN108103308A (en) * | 2016-11-25 | 2018-06-01 | 上海梅山钢铁股份有限公司 | A kind of device and method for steel-smelting sewage sludge pelletizing |
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| EP2980232B1 (en) * | 2013-03-26 | 2018-11-14 | Posco | Method for recycling iron-containing by-products discharged from coal-based ironmaking process, system used therefor, and direct-reduced iron agglomeration system |
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| DD252393A1 (en) * | 1986-08-19 | 1987-12-16 | Maxhuette Unterwellenborn | METHOD FOR COOLING AND CHEMICAL ALIGNMENT OF STEEL MELTS |
| DE3732351A1 (en) * | 1987-09-25 | 1989-04-06 | Metallgesellschaft Ag | METHOD FOR PRODUCING BINDERLESS BRIQUETTES FROM STEEL DUST |
| JP2001348625A (en) * | 2000-06-08 | 2001-12-18 | Nippon Steel Corp | Method for producing pellet for iron-marking raw material |
| KR100624295B1 (en) * | 2000-08-10 | 2006-09-13 | 가부시키가이샤 제이텍트 | Briquette as material for steel making and method for production thereof |
| ES2275734T3 (en) * | 2000-10-02 | 2007-06-16 | Jtekt Corporation | IRON BASE POWDER MATERIAL AND METHOD FOR MANUFACTURING. |
| CN1328358C (en) * | 2002-09-02 | 2007-07-25 | Posco公司 | Coal briquettes for smelting reduction process, and method for manufacturing the same |
| DE602004025163D1 (en) * | 2003-03-07 | 2010-03-11 | Jtekt Corp | Briquette as a raw material for iron production and briquette for introduction into a slag-forming device |
-
2008
- 2008-12-17 CN CN2008801211500A patent/CN101903541B/en active Active
- 2008-12-17 WO PCT/KR2008/007469 patent/WO2009078662A2/en active Application Filing
- 2008-12-17 BR BRPI0821263A patent/BRPI0821263B8/en not_active IP Right Cessation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103308A (en) * | 2016-11-25 | 2018-06-01 | 上海梅山钢铁股份有限公司 | A kind of device and method for steel-smelting sewage sludge pelletizing |
| CN108103308B (en) * | 2016-11-25 | 2019-10-18 | 上海梅山钢铁股份有限公司 | A kind of device and method for steel-smelting sewage sludge pelletizing |
| CN107723466A (en) * | 2017-09-21 | 2018-02-23 | 汶川县三力铁合金有限责任公司 | It is a kind of to make the method that adhesive is fine ore cold-press agglomeration using environmentally friendly ash |
Also Published As
| Publication number | Publication date |
|---|---|
| BRPI0821263A2 (en) | 2015-06-16 |
| CN101903541B (en) | 2012-11-14 |
| BRPI0821263B8 (en) | 2018-04-03 |
| BRPI0821263B1 (en) | 2017-09-05 |
| WO2009078662A3 (en) | 2009-09-24 |
| WO2009078662A2 (en) | 2009-06-25 |
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