WO2013014926A1 - 焼結鉱の製造方法および製造設備ならびに粉原料投射装置 - Google Patents
焼結鉱の製造方法および製造設備ならびに粉原料投射装置 Download PDFInfo
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- WO2013014926A1 WO2013014926A1 PCT/JP2012/004735 JP2012004735W WO2013014926A1 WO 2013014926 A1 WO2013014926 A1 WO 2013014926A1 JP 2012004735 W JP2012004735 W JP 2012004735W WO 2013014926 A1 WO2013014926 A1 WO 2013014926A1
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- raw material
- drum mixer
- powder raw
- conveyor
- sintered
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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
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
Definitions
- the present invention relates to a method for producing sintered ore used as a blast furnace raw material and its production equipment. Moreover, this invention relates to the powder raw material projection apparatus used when manufacturing a sintered ore.
- Sintered ore used as blast furnace raw material is iron ore with a particle size of 10 mm or less as the main raw material, and SiO 2 containing raw materials such as quartzite and serpentine, solid fuel such as limestone powder raw materials such as quick lime and limestone, and powder coke. It is common to produce a sintered raw material using a system powder raw material as an auxiliary raw material by granulating it with a drum mixer, and firing the granulated sintered raw material with a Dwytroid type sintering machine. The reducibility of sintered ore produced by such a method is a factor that greatly affects the operation of the blast furnace.
- the gas utilization rate in the blast furnace has a negative correlation with the fuel ratio. For this reason, if the reducibility of the sintered ore is improved, the fuel ratio in the blast furnace decreases.
- the cold strength of sintered ore is an important factor in ensuring air permeability in the blast furnace, and each blast furnace is operated with a lower limit set for the cold strength of the sintered ore. . Therefore, it can be said that the desired sintered ore for the blast furnace is excellent in reducibility and has high cold strength.
- Patent Document 1 or Patent Document 2 discloses iron ore, SiO 2 -containing raw material, limestone-based powder raw material as a pretreatment of a process for producing a blast furnace sintered ore using a downward suction dwroid type sintering machine.
- a sintering raw material comprising a solid fuel-based powder raw material with a drum mixer
- it comprises iron ore and a SiO 2 -containing raw material excluding the limestone-based powder raw material and the solid fuel-based powder raw material from the inlet of the drum mixer
- the limestone powder raw material and the solid fuel powder raw material are charged from the exit side of the drum mixer, and the charged limestone powder raw material and the solid fuel powder raw material are put on the outer surface of the pseudo particle.
- a sintered raw material is charged from the inlet of the drum mixer, and a limestone powder raw material and a solid fuel powder raw material are charged from the outlet side of the drum mixer. Dispersion of limestone powder raw material and solid fuel powder raw material additionally charged from the outlet side of the drum mixer when the powder raw material and solid fuel powder raw material are adhered to the outer surface of the pseudo particle to granulate the sintered raw material.
- a technique is described in which the conveyor is disposed obliquely with respect to the axial direction of the drum mixer and the charging position in the width direction is changed.
- Patent Document 4 iron ore and SiO 2 -containing material are charged into a mixing drum mixer, mixed and stirred, and then the mixture discharged from the mixing drum mixer is supplied to a disk pelletizer to supply a limestone powder material. And the solid fuel-based powder raw material is granulated, and then the granulated pseudo-particle is charged into the coating drum mixer and the limestone powder raw material and the solid fuel-based powder are placed inside the coating drum mixer. A method of granulating a sintered raw material by projecting the raw material is described.
- the powder raw material 15 dropped on the pseudo particle group 16 flows down in the y-axis direction (circumferential direction of the drum mixer 3) and toward the outlet of the drum mixer 3. In the region ⁇ , the powder raw material comes into contact with the coated pseudo particles again. For this reason, when the powder raw material 15 is projected inside the drum mixer 3 and the outer surface of the pseudo particle is coated with the powder raw material 15, coating unevenness is likely to occur, and a good sintered ore is produced as a blast furnace raw material. There was a problem that was difficult.
- This invention is made paying attention to the problem mentioned above, and it aims at providing the manufacturing method and manufacturing equipment of the sintered ore which can manufacture a favorable sintered ore as a blast furnace raw material. It is.
- Another object of the present invention is to provide a powder raw material projecting apparatus suitable for projecting a powder raw material such as a limestone powder raw material or a solid fuel powder raw material into the interior of a drum mixer.
- the present invention provides a method for producing a sintered ore, a production facility for a sintered ore, and a powder raw material projecting apparatus as described below.
- Sintered raw materials containing iron ore as the main raw material and SiO 2 containing raw material and limestone powder raw material or solid fuel powder raw material as auxiliary raw materials are granulated with a disk pelletizer,
- the pseudo particles after granulation are charged into a coating drum mixer, and a powder raw material projection device for projecting the limestone powder raw material and / or the solid fuel powder raw material is charged into the drum mixer.
- a method for producing a sintered ore wherein the powder raw material is charged into the drum mixer after being moved to a position off the upper position of the pseudo particle group.
- Sintered raw materials containing iron ore as the main raw material and SiO 2 containing raw material and limestone powder raw material or solid fuel-based powder raw material as auxiliary raw materials are granulated with a drum mixer, and the granulated sintered raw material is obtained.
- a method for producing a sintered ore produced by firing with a dweroid-type sintering machine wherein a raw material comprising the iron ore and the SiO 2 -containing raw material is charged into the drum mixer. Then, the pseudo particles after granulation are charged into a coating drum mixer, and a powder raw material projection device for projecting the limestone powder raw material and / or the solid fuel powder raw material is charged into the drum mixer.
- a method for producing a sintered ore wherein the powder raw material is charged into the drum mixer after being moved to a position off the upper position of the pseudo particle group.
- Sintered raw materials containing iron ore as the main raw material and SiO 2 containing raw material and limestone powder raw material or solid fuel powder raw material as auxiliary raw materials are granulated with a drum mixer, and the granulated sintered raw material is obtained.
- a method for producing a sintered ore wherein the powder raw material is charged into the drum mixer after being moved to a detached position.
- the powder raw material projecting apparatus includes a pair of left and right guide rails that guide the coating drum mixer in the axial direction, and a guide rail support carriage that supports the guide rails in a lateral direction orthogonal to the axial direction of the drum mixer.
- a facility for producing sintered ore comprising:
- the powder raw material projecting apparatus includes a pair of left and right guide rails that guide the coating drum mixer in the axial direction, and a guide rail support carriage that supports the guide rails in a lateral direction orthogonal to the axial direction of the drum mixer.
- a facility for producing sintered ore comprising:
- the powder raw material projecting apparatus includes a pair of left and right guide rails that guide in a direction, and a guide rail support carriage that supports the guide rails in a lateral direction perpendicular to the axial direction of the drum mixer. Sinter ore manufacturing equipment.
- the sintered ore production facility according to any one of (9) to (11), further comprising a conveyor tilting mechanism that tilts the projection conveyor in the vertical direction with respect to the conveyor support carriage.
- a powder raw material projection apparatus used when producing sintered ore wherein the solid fuel powder raw material or limestone powder raw material, which is a secondary raw material of the sintered ore, is conveyed and projected into a drum mixer.
- a projection conveyor a conveyor support carriage that supports the projection conveyor so as to be movable in the axial direction of the drum mixer, a pair of left and right guide rails that guide the conveyor support carriage in the axial direction of the drum mixer, and the guide rails
- a powder raw material projecting apparatus comprising: a guide rail support carriage that supports a slidable movement in a lateral direction perpendicular to the axial direction of the drum mixer.
- pseudo particles obtained by granulating a mixture comprising a main raw material of sintered ore and a SiO 2 -containing raw material are charged into a drum mixer, and the pseudo particles are removed.
- solid fuel powder raw material or limestone powder raw material When coating the surface with solid fuel powder raw material or limestone powder raw material, solid fuel powder raw material or limestone powder raw material can be attached to the outer surface of the pseudo particle without being influenced by the particle size of the pseudo particle Therefore, it is possible to provide a powder raw material projection device suitable for projecting powder raw materials such as limestone powder raw materials and solid fuel powder raw materials into the drum mixer.
- a more suitable powder raw material projecting apparatus when projecting a powder raw material such as a limestone powder raw material or a solid fuel powder raw material into the drum mixer.
- FIG. 1 is a diagram showing an example of a sinter ore manufacturing facility used when manufacturing a blast furnace sinter.
- the sinter ore manufacturing facility shown in FIG. 1 includes a mixing drum mixer 1, a disk pelletizer 2, and a coating.
- Drum mixer 3 limestone powder raw material projecting device 4, solid fuel powder raw material projecting device 5, and dwelloid type sintering machine 6.
- the mixing drum mixer 1 mixes the main raw material of sintered ore together with the SiO 2 -containing raw material, and is composed of a mixer body formed in a cylindrical shape and a drive motor that rotationally drives the mixer body. .
- the main raw materials for sintered ore include coarse iron ore, pellet feed, and return.
- the disk pelletizer 2 granulates the mixture discharged from the mixing drum mixer 1, and the mixture granulated by the disk pelletizer 2 becomes, for example, pseudo particles having a particle diameter of about 3 mm to 13 mm for coating. It is supplied to the drum mixer 3.
- the coating drum mixer 3 is for coating the outer surface of the pseudo particles granulated by the disk pelletizer 2 with a limestone powder raw material or a solid fuel powder raw material, and a mixer body formed in a cylindrical shape, It is comprised with the drive motor which rotationally drives this mixer main body.
- the limestone powder raw material projection device 4 projects a limestone powder raw material such as limestone onto the inside of the coating drum mixer 3, and is disposed on the inlet side of the coating drum mixer 3.
- the solid fuel-based powder raw material projecting device 5 projects a solid fuel-based powder raw material such as coke breeze into the interior of the coating drum mixer 3, and is disposed on the outlet side of the coating drum mixer 3.
- the Dwydroid-type sintering machine 6 fires the pseudo particles discharged from the coating drum mixer 3, and conveys the pseudo particles horizontally in the direction of the arrow in the figure, and the pseudo particles on the conveyor 61. And a plurality of blowers 62 for suctioning from below. Further, the dwelloid type sintering machine 6 has an ignition furnace 63 for igniting a solid fuel-based powder raw material such as powder coke, and the ignition furnace 63 is disposed above the conveyor 61.
- the main raw material of the sinter is charged into the mixing drum mixer 1 together with the SiO 2 -containing raw material.
- the mixing drum mixer 1 is rotated, and the charged main raw material and the SiO 2 -containing raw material are mixed together with water.
- the mixture discharged from the mixing drum mixer 1 was fed to the disc pelletizer 2, the mixture is granulated comprising a main raw material and the SiO 2 containing feedstock as a pseudo particles of the sintered material.
- the granulated pseudo particles are charged into the coating drum mixer 3, and the coating drum The mixer 3 is rotated.
- the limestone powder raw material is charged into the coating drum mixer 3 from the limestone powder raw material projecting device 4, and the solid fuel powder is fed into the coating drum mixer 3 from the solid fuel powder raw material projecting device 5.
- the raw material is charged, and the surface of the pseudo particle is coated with the powder raw material charged in the coating drum mixer 3 to granulate the sintered raw material.
- emitted from the drum mixer 3 for a coating is supplied to the dwroid type sintering machine 6, and the sintered ore for blast furnaces is manufactured.
- FIG. 2 is a diagram showing an example of a powder raw material projection device used when projecting a powder raw material such as a limestone powder raw material or a solid fuel powder raw material into the interior of the coating drum mixer.
- the projection device 7 includes a projection conveyor 8, a conveyor support carriage 9, a pair of left and right guide rails 10, a guide rail support carriage 11, and a conveyor tilt mechanism 12.
- the projection conveyor 8 conveys and projects the powder raw material into the coating drum mixer 3 and is mounted on the conveyor support carriage 9.
- the conveyor support carriage 9 supports the projection conveyor 8 so as to be movable in the axial direction of the coating drum mixer 3, and is placed on the guide rail 10 so as to be able to run.
- the guide rail 10 guides the conveyor support carriage 9 in the axial direction of the coating drum mixer 3, and is installed on the guide rail support carriage 11.
- the guide rail support carriage 11 supports the guide rail 10 so as to be movable in a lateral direction perpendicular to the axial direction of the coating drum mixer 3, and travels in a lateral direction perpendicular to the axial direction of the coating drum mixer 3.
- a plurality of (for example, six) traveling wheels 13 are provided.
- the conveyor tilting mechanism 12 tilts the projection conveyor 8 in the vertical direction with respect to the conveyor support carriage 9 and includes a plurality of jacks 14 disposed between the projection conveyor 8 and the conveyor support carriage 9.
- FIG. 3 is a diagram for explaining the operation of the powder raw material projection apparatus shown in FIG. 2, and the limestone powder raw material and the solid fuel powder raw material inside the coating drum mixer 3 using the powder raw material projection apparatus 7 described above.
- 3A as shown in FIG. 3A, the projection conveyor 8 and the conveyor support carriage 9 are arranged so that the tip of the projection conveyor 8 is not positioned above the pseudo particle group 16 charged in the drum mixer 3.
- the guide rail 10 is moved in the lateral direction perpendicular to the axial direction of the coating drum mixer 3 by the guide rail support carriage 11, and the projection conveyor 8 is projected so that the elevation angle is a predetermined angle (for example, around 25 °).
- the conveyor 8 is tilted by the conveyor tilting mechanism 12.
- the powder raw material 15 projected from the projection conveyor 8 falls to a position A shown in FIG.
- This position A is a position outside the base of the pseudo particle group 16 charged in the drum mixer 3, and the powder raw material 15 projected from the projection conveyor 8 falls on the inner peripheral surface of the drum mixer 3.
- the powder raw material 15 dropped on the inner peripheral surface of the drum mixer 3 is indicated by an arrow in FIG.
- the drum mixer 3 rotates, the drum mixer 3 relatively moves in the circumferential direction.
- the powder raw material 15 wraps around the upper surface side of the pseudo particle group 16 and is supplied over the entire upper surface portion of the pseudo particle group 16. Is done.
- the powder raw material 15 supplied to the upper surface of the quasi-particle group 16 adheres to the surface of each quasi-particle and coats the surface of the quasi-particle uniformly.
- the powder raw material 15 such as the limestone powder raw material or the solid fuel powder raw material
- the powder raw material 15 projected from the projection conveyor 8 of the powder raw material projection apparatus 7 falls on the inner peripheral surface of the drum mixer 3. .
- the powder raw material 15 projected from the powder raw material projection device 7 falls on the pseudo particle group 16 and is suppressed from being discharged from the drum mixer 3 in a state of excessively adhering to the surface of the coarse particle pseudo particle 16a.
- the pseudo particles obtained by granulating a mixture of the main raw material of sintered ore and the SiO 2 -containing raw material are charged into the coating drum mixer 3 so that the outer surface of the pseudo particles is solid fuel-based powder raw material or When coating with the limestone powder raw material, the solid fuel powder raw material or the limestone powder raw material can be attached to the outer surface of the pseudo particle 16 without being influenced by the particle diameter of the pseudo particle.
- the position outside the base of the quasi-particle group here is a position where the adhering matter adhering to the inner surface of the drum mixer easily falls due to the centrifugal force due to the rotation of the drum mixer 3 and its own adhering force (see FIG. 23).
- This position is a position where the powder raw material 15 is supplied, so that when the powder raw material 15 is supplied, the tip is located inside the drum mixer 3 by the powder raw material supply by the belt conveyor.
- the position becomes acceptable.
- the projection conveyor 8 is tilted by the conveyor tilting mechanism 12 so that the elevation angle of the projection conveyor 8 becomes a predetermined angle, the horizontal arrival distance of the powder raw material 15 projected from the projection conveyor 8 does not tilt the projection conveyor 8. Since it becomes long compared with the case, the conveyance speed of the powder raw material 15 conveyed by the projection conveyor 8 can be made small, and the powder raw material 15 can be projected inside the coating drum mixer 3.
- the projection conveyor 8 of the powder raw material projection device 7 is moved to a position off the upper position of the pseudo particle group 16 charged in the drum mixer 3. Since the projection conveyor 8 is located at a position where it does not receive the drop impact of falling objects falling from the inner surface of the drum mixer 3, even if the tip of the projection conveyor 8 is inserted into the coating drum mixer 3, Damage to the projection conveyor 8 is reduced.
- FIG. 1 shows an example of granulating with a disk pelletizer and coating a solid fuel powder raw material or a limestone powder raw material with a coating drum mixer.
- a coating drum mixer can be used.
- the drum mixer itself performs the same function as the coating drum mixer by supplying a solid fuel powder raw material or a limestone powder raw material to the discharge side of the drum mixer.
- the raw material composed of iron ore and SiO 2 -containing raw material is charged into the drum mixer, and then the limestone powder raw material and / or solid fuel powder raw material is projected onto the discharge side of the drum mixer After moving the raw material projection device to a position off the upper position of the quasi-particle group charged and granulated in the drum mixer, the raw material powder is charged into the drum mixer and granulated in the drum mixer.
- the sintered raw material made into particles can be coated with a solid fuel powder raw material or a limestone powder raw material.
- FIG. 4 shows a powder raw material (solid fuel powder raw material or limestone powder raw material) projection position on the discharge side of the drum mixer 17 that mixes and granulates the sintered raw material, and the solid fuel powder raw material is produced by the powder raw material projection device.
- FIG. 4 is a diagram in which any one of the limestone powder raw materials is projected, and is an example in which the function of the coating drum mixer 3 shown in FIG.
- the discharge-side internal position in the drum mixer 17 is the powder raw material projection position. That is, the sintered raw material is charged into the drum mixer 17 from the charging side of the drum mixer 17, and the charged sintered raw material is mixed and granulated by the rotation of the drum mixer 17, and the sintered raw material is discharged on the discharge side.
- This discharge side is set as the projection position of the powder raw material, and the projection position is a position outside the base of the pseudo particle group 16 in the drum mixer 17 as in FIG. 3, and the solid fuel system projected from the projection conveyor 8.
- the powder raw material and / or the limestone powder raw material 15 is dropped onto the inner peripheral surface of the drum mixer 17.
- the drum mixer 17 is configured as a single unit, and is used as two drum mixers as a mixing drum mixer and a granulating drum mixer assigned to each function of the mixing and granulating functions.
- the discharge side of the granulating drum mixer is the projection position of the powder raw material.
- FIG. 5 shows the results of examining the pseudo particles discharged from the coating drum mixer 3 and the outer surface of the pseudo particles discharged by projecting the powder raw material on the discharge side of the drum mixer 17.
- FIG. 5A shows a case where powder coke is projected inside the coating drum mixer 3 with the projection conveyor 8 being positioned at the position shown in FIG. 23A, and FIG. The case where the powder coke is projected on the inside of the drum mixer 3 for coating in the state which has located the projection conveyor 8 in the position shown to b) is shown.
- “+8.0 mm” in FIG. 5 indicates a pseudo particle having a particle diameter of 8.0 mm or more
- “ ⁇ 0.25 mm” indicates a pseudo particle having a particle diameter of less than 0.25 mm.
- the particle diameter is 4.75 mm or more. A lot of powder coke adheres.
- the projection conveyor 8 is in the position shown in FIG. 3 (b), as shown in FIG. 5 (b), the most abundant particles among the pseudo particles charged in the coating drum mixer 3 are present. It can be seen that the powder coke also adheres to those having a diameter (1.0 to 2.8 mm) and those having a particle diameter smaller than 2.8 mm.
- the powder raw material projecting device 7 shown in FIG. 2 as an apparatus for projecting a solid fuel-based powder raw material such as powder coke into the drum mixer, the main raw material of sintered ore and the SiO 2 -containing raw material are used.
- the pseudo particles obtained by granulating the mixture are charged into a drum mixer and the outer surface of the pseudo particles is coated with the solid fuel powder raw material, the solid fuel powder raw material depends on the particle size of the pseudo particles. Since it becomes possible to make it adhere to the outer surface of a pseudo particle, it can manufacture a favorable sintered ore as a blast furnace raw material.
- FIG. 6 is a diagram showing the results of investigating the relationship between the powder raw material conveyance speed of the projection conveyor shown in FIG. 2 and the coating time for coating the surface of the pseudo particles with the powder raw material projected from the projection conveyor.
- the speed of the projection conveyor 8 is increased, the falling range of the powder raw material falling on the inner peripheral surface of the coating drum mixer 3 is widened, and the coating time is likely to vary. In order to prevent this, it is necessary to reduce the speed of the projection conveyor 8. However, if the speed of the projection conveyor 8 is reduced, the solid fuel-based powder material released from the projection conveyor 8 does not reach the pseudo particles in the drum mixer. there is a possibility.
- FIG. 7 The result of investigating the relationship between the horizontal arrival distance of the powder raw material projected from the projection conveyor 8 of the powder raw material projection apparatus 7 shown in FIG. 2 and the fall height of the powder raw material from the tip of the projection conveyor is shown in FIG.
- a solid line “a” indicates a case where the powder raw material is projected at a speed of 240 m / min in a state where the projection conveyor 8 is horizontal
- a one-dot chain line “b” indicates a projection amount of the projection conveyor 8 that projects into the coating drum mixer 3. This shows a case where the powder raw material is projected at a speed of 210 m / min in a state of 300 mm.
- the broken line c in FIG. 7 shows the case where the powder raw material is projected at a speed of 210 m / min while the height of the projection conveyor 8 is increased, and the two-dot chain line d indicates the elevation angle of the projection conveyor 8 is 25 degrees upward. In this state, the powder raw material is projected at a speed of 210 m / min. As shown in FIG. 7, when the elevation angle of the projection conveyor 8 is 25 degrees, the horizontal arrival distance of the powder raw material reaches the pseudo particles in the drum mixer even when the speed of the projection conveyor 8 is 210 m / min. I understand that
- the projection raw material is projected to the inside of the drum mixer after the projection conveyor 8 is inclined by the conveyor inclination mechanism 12 so that the elevation angle of the projection conveyor 8 becomes a predetermined angle.
- the horizontal reach distance is increased, thereby reducing the conveying speed of the powder raw material conveyed by the projection conveyor 8 and projecting the powder raw material to a position outside the upper position of the granulated pseudo particle group inside the drum mixer. Therefore, a better sintered ore can be produced as a blast furnace raw material.
- solid fuel-based powder raw material such as powder coke is granulated from the outlet side of the coating drum mixer 3 when granulating the pseudo particles calcined by the dwelloid type sintering machine 6.
- the quasi-particles are granulated by projecting, since the sintered raw material introduced into the coating drum mixer 3 is quasi-particles, the solid fuel powder raw material is introduced from the inlet side of the coating drum mixer 3. You may make it project and granulate a pseudo particle. The same applies even if the powder material projected from the projection conveyor 8 is a limestone powder material.
- FIG. 8 is a diagram showing a method for producing a sintered ore according to the second embodiment of the present invention.
- the second embodiment is different from the first embodiment in that the disk pelletizer for granulating pseudo particles serves as a drum mixer, and the coating drum mixer 3 is different except that a single drum mixer 17 is used as the drum mixer.
- the iron ore and SiO 2 -containing raw material are mixed and granulated by the drum mixer 17 to become pseudo particles, and the sintered raw material that has become pseudo particles is charged into the coating drum mixer 3.
- the limestone powder raw material is projected from the charging side, and the powder coke as the solid fuel raw material is projected from the discharge side, thereby coating the pseudo particles.
- the limestone powder raw material adheres to the surface of the pseudo raw material of the sintered raw material, and the powdery coke adheres to the outermost layer position to improve the productivity of the sintering, and the limestone powder raw material is simulated during the sintering. Because it exists in the particle surface layer part, it is possible to produce good sintered ore as a blast furnace raw material with high-strength calcium ferrite formed on the surface of the sintered ore mass and hematite with high reducibility generated inside the mass. it can.
- the third embodiment shown in FIG. 10 and the fourth embodiment shown in FIG. 12 are also granulated by the drum mixer 17 to become pseudo particles, and the second embodiment is that the surface of the pseudo particles is coated with the coating drum mixer 3.
- the powder coke and the limestone powder raw material which are solid fuel powder raw materials, are projected from the charging side of the coating drum mixer 3, and the pseudo particle surface is projected. Coating.
- group powder raw material and the limestone type powder raw material are projected from the discharge side of the drum mixer 3 for coating, and the surface of a pseudo particle is coated.
- a mixed layer of powder coke and solid fuel-based powder raw material is formed on the surface of the pseudo particles granulated by the drum mixer 17, and combustion occurs because the powder coke exists on the surface of the pseudo particles. Since the limestone powder raw material is present on the surface of the pseudo particle during sintering, high strength calcium ferrite is added to the surface of the sintered ore lump and inside the lump. Can produce high-reducible hematite and can produce a good sintered ore as a blast furnace raw material.
- FIG. 9 shows a projection form in which particles are coated.
- the limestone powder raw material 15B is projected from the charging side of the coating drum mixer 3, and the limestone powder raw material 15B is projected to a position outside the base of the pseudo particle group 16 charged in the coating drum mixer 3.
- the powder coke 15A which is a solid fuel-based powder raw material, is projected from the discharge side of the coating drum mixer 3, and the powder coke 15A is projected to a position outside the base of the pseudo particle group 16 in the coating drum mixer 3. .
- the coke that is the limestone powder raw material and the solid fuel powder raw material is mixed in advance or simultaneously cut out on the belt of the projection conveyor 8 to form a single layer. What is necessary is just to project in the drum mixer 3 for coating by the projection conveyor 8 of this. Or you may project the powder coke which is a limestone type powder raw material and a solid fuel type powder raw material using the separate projection conveyor 8, respectively.
- the coating drum mixer 3 may be of a size that can ensure a residence time for coating the limestone powder raw material and / or the solid fuel powder raw material, up to 15 m in consideration of the coating residence time of 10 to 90 seconds.
- a drum mixer having a length is preferred.
- it can carry out without trouble by projecting a limestone powder raw material and / or a solid fuel powder raw material from the discharge side.
- FIG. 14 shows a drum mixer 1A for mixing and a drum mixer 1B for granulation used as a drum mixer.
- powder coke which is a solid fuel-based powder raw material is projected.
- 10 shows a fifth embodiment in which powder coke coating is performed on the particle surface.
- the iron ore and the SiO 2 -containing raw material are supplied to the mixing drum mixer 1A, and the limestone powder raw material is added in the transport process in the part where the mixed pseudo particles are partially formed.
- powder coke which is a solid fuel-based powder raw material is projected, and powder coke coating is performed on the surface of the pseudo particles.
- iron ore, SiO 2 -containing raw material, and powder coke that is a solid fuel-based powder raw material are supplied to the mixing drum mixer 1A and mixed, and on the discharge side of the granulating drum mixer 1B.
- the limestone powder raw material is projected, and the surface of the pseudo particle is coated with the limestone powder raw material.
- the seventh embodiment shown in FIG. 16 on the discharge side of the granulating drum mixer 1B, powder coke and limestone powder raw materials that are solid fuel powder materials are projected, and powder coke and limestone are projected on the surface of the pseudo particles. Coating of the raw powder material is performed. Also in this case, when coating the powder coke / limestone powder raw material, the powder coke which is the limestone powder raw material and the solid fuel powder raw material is mixed in advance, or is laminated on the belt of the projection conveyor 8 by simultaneous cutting. If the single projection conveyor 8 projects the form into the granulating drum mixer 1B or the powder coke that is the limestone powder raw material and the solid fuel powder raw material using different projection conveyors 8 respectively. As shown in FIG.
- the limestone powder raw material 15B and the powder coke 15A may be projected from the discharge side of the granulating drum mixer 1B, and the limestone powder raw material is distant from the powder coke by the projection conveyor 8 in the figure.
- the powder coke 15 is projected to the vicinity by another projection conveyor (not shown) disposed below the projection conveyor 8 of the limestone powder raw material. The is accomplished by projecting the position where the discharge side of the limestone-based powder material.
- a drum mixer having a drum length of 12 to 20 m can be used.
- a drum mixer having a longer drum length than the mixing drum mixer for example, a drum length of 16 to 25 m is used.
- the drum mixer can be used.
- FIGS. 18 to 20 are embodiments showing coating examples of powder coke and limestone powder raw materials that are solid fuel powder raw materials when a single drum mixer 17 is used as the drum mixer.
- iron ore, SiO 2 -containing raw material, and limestone powder raw material are granulated with a drum mixer 17, and powder coke that is a solid fuel powder raw material is coated on the discharge side of the drum mixer 17. Is done.
- iron ore, SiO 2 -containing raw material, and powder coke that is a solid fuel-based powder raw material are granulated by the drum mixer 17, and on the discharge side of the drum mixer 17, the surface of the pseudo particles is limestone-based.
- the powder raw material is coated.
- iron ore and SiO 2 -containing raw material are granulated by the drum mixer 17, and powder coke and limestone based solid fuel-based powder raw material are formed on the pseudo particle surface on the discharge side of the drum mixer 17.
- the powder raw material is coated.
- the single drum mixer 17 can be a drum mixer having a drum length of 20 to 25 m, and mixing and granulation can be performed by securing the granulation time of the sintered raw material to 300 to 500 seconds. Can do.
- the present inventors investigated the CaO concentration of the sintered raw material granulated by the method shown in FIG. 23 (conventional method) and the sintered raw material granulated by the method of the present invention.
- the investigation results are shown in FIG. In FIG. 21, “+8.0 mm”, “+4.75 mm”, “+2.75 mm”, “+1.0 mm”, “+0.5 mm”, and “+0.25 mm” have a particle diameter of 8.0 mm or more. .75 mm or more, 2.75 mm or more, 1.0 mm or more, 0.5 mm or more, 0.25 mm or more sintering raw materials are indicated, and “ ⁇ 0.25 mm” indicates a sintering raw material having a particle diameter of less than 0.25 mm.
- the CaO concentration was investigated using the apparatus shown in FIG. When the CaO concentration of the sintered raw material obtained by the conventional method and the CaO concentration of the sintered raw material obtained by the method of the present invention are compared, the particle diameter of the sintered raw material obtained by the method of the present invention is 8.0 mm or more. It was found that the CaO concentration was lower than that of the sintered raw material obtained by the conventional method.
- the sintered raw materials obtained by the method of the present invention those having a particle diameter of 2.8 mm or more and those having a particle diameter of 1.0 mm or more are higher in CaO concentration than the sintered raw materials obtained by the conventional method. It has been found. This means that the powder raw material charged in the drum mixer is suppressed from excessively adhering to the surface of the coarse quasi-particles segregated in the drum mixer, and uniform adhesion is realized.
- the present inventors divided the sintering raw material obtained by the conventional method and the method of the present invention for each particle size, Firing was performed at 1300 ° C. for 5 minutes in an electric furnace. And the sample after baking was grind
- the existing ratio of the hematite structure after firing is about 60% when the particle diameter is 8.0 mm or more.
- the particle diameter of 4.75 mm is about 40%
- the abundance ratio of the hematite structure after firing is 90% or more when the particle diameter is 8.0 mm or more, and the particle diameter is 4.75 mm. It became more than 70%.
- the total abundance ratio of the hematite structure and the calcium ferrite structure after firing is about 60% when the particle size is 2.8 mm, whereas in the method of the present invention, the hematite structure and the calcium ferrite structure after firing.
- the total abundance ratio was 70% or more when the particle diameter was 2.8 mm.
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Abstract
Description
このような方法により製造される焼結鉱の被還元性は、高炉の操業を大きく左右する因子となる。例えば、焼結鉱の被還元性と高炉でのガス利用率との間には正の相関があり、高炉でのガス利用率は燃料比との間に負の相関がある。このため、焼結鉱の被還元性を向上させると、高炉での燃料比は低下する。また、焼結鉱の冷間強度も高炉での通気性を確保する上で重要な因子であり、各々の高炉では、焼結鉱の冷間強度に下限基準を設定して操業を行っている。従って、高炉にとって望ましい焼結鉱とは、被還元性に優れ、冷間強度が高いものであると言える。
(1)鉄鉱石を主原料とし、かつSiO2含有原料および石灰石系粉原料や固体燃料系粉原料を副原料とする焼結原料をディスクペレタイザーで造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造する焼結鉱の製造方法であって、前記焼結原料の内、前記鉄鉱石と前記SiO2含有原料とからなる原料を前記ディスクペレタイザーに装入して造粒し、次いで造粒後の擬似粒子をコーティング用ドラムミキサーに装入し、前記石灰石系粉原料および/または前記固体燃料系粉原料を投射する粉原料投射装置を前記ドラムミキサーに装入された擬似粒子群の上方位置から外れた位置に移動させた後、前記粉原料を前記ドラムミキサーに装入することを特徴とする焼結鉱の製造方法。
(5)前記粉原料投射装置として、前記粉原料を前記ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車と、を有するものを用い、前記投射コンベア、前記コンベア支持台車および前記ガイドレールを前記ガイドレール支持台車により所定位置に移動させた後、前記粉原料を前記ドラムミキサーに装入することを特徴とする(1)~(3)のいずれかに記載の焼結鉱の製造方法。
(7)前記コーティング用ドラムミキサーの内部に前記粉原料を前記ドラムミキサーの出口側から装入することを特徴とする(1)~(6)のいずれかに記載の焼結鉱の製造方法。
(9)鉄鉱石を主原料とし、かつSiO2含有原料、石灰石系粉原料および固体燃料系粉原料を副原料とする焼結原料を造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造する焼結鉱の製造設備であって、
前記焼結原料を造粒するディスクペレタイザーと、前記焼結原料の表面をコーティングするコーティング用ドラムミキサーと、該ドラムミキサーの内部に粉原料を投射する粉原料投射装置とを備え、
前記粉原料を前記コーティング用ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記コーティング用ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記コーティング用ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを前記粉原料投射装置が有することを特徴とする焼結鉱の製造設備。
前記焼結原料を造粒するドラムミキサーと、前記焼結原料の表面をコーティングするコーティング用ドラムミキサーと、該コーティング用ドラムミキサーの内部に粉原料を投射する粉原料投射装置とを備え、
前記粉原料を前記コーティング用ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記コーティング用ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記コーティング用ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを前記粉原料投射装置が有することを特徴とする焼結鉱の製造設備。
前記焼結原料を造粒するドラムミキサーと、該造粒するドラムミキサーの排出側からドラムミキサー内部に粉原料を投射する粉原料投射装置とを備え、
前記粉原料を前記ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを前記粉原料投射装置が有することを特徴とする焼結鉱の製造設備。
(13)焼結鉱を製造するときに用いられる粉原料投射装置であって、前記焼結鉱の副原料である固体燃料系粉原料または石灰石系粉原料をドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを備えたことを特徴とする粉原料投射装置。
(14)前記コンベア支持台車に対して前記投射コンベアを上下方向に傾けるコンベア傾斜機構をさらに備えたことを特徴とする(13)に記載の粉原料投射装置。
(13),(14)の発明によれば、石灰石系粉原料や固体燃料系粉原料などの粉原料をドラムミキサーの内部に投射するときにより好適な粉原料投射装置を提供できる。
図1は高炉用焼結鉱を製造するときに用いられる焼結鉱製造設備の一例を示す図であり、図1に示される焼結鉱製造設備は混合用ドラムミキサー1、ディスクペレタイザー2、コーティング用ドラムミキサー3、石灰石系粉原料投射装置4、固体燃料系粉原料投射装置5およびドワイトロイド式焼結機6を備えている。
混合用ドラムミキサー1は焼結鉱の主原料をSiO2含有原料と共に混合するものであって、円筒状に形成されたミキサー本体と、このミキサー本体を回転駆動する駆動モータとで構成されている。なお、焼結鉱の主原料としては、粗粒鉄鉱石、ペレットフィード、返鉱などが挙げられる。
コーティング用ドラムミキサー3はディスクペレタイザー2で造粒された擬似粒子の外表面を石灰石系粉原料や固体燃料系粉原料でコーティングするためのものであって、円筒状に形成されたミキサー本体と、このミキサー本体を回転駆動する駆動モータとで構成されている。
固体燃料系粉原料投射装置5は粉コークス等の固体燃料系粉原料をコーティング用ドラムミキサー3の内部に投射するものであって、コーティング用ドラムミキサー3の出口側に配置されている。
投射コンベア8はコーティング用ドラムミキサー3の内部に粉原料を搬送して投射するものであって、コンベア支持台車9の上に搭載されている。
ガイドレール10はコンベア支持台車9をコーティング用ドラムミキサー3の軸方向に案内するものであって、ガイドレール支持台車11の上に設置されている。
ガイドレール支持台車11はガイドレール10をコーティング用ドラムミキサー3の軸方向と直交する横方向に移動可能に支持するものであって、コーティング用ドラムミキサー3の軸方向と直交する横方向に走行する複数(例えば6つ)の走行車輪13を有している。
コンベア傾斜機構12はコンベア支持台車9に対して投射コンベア8を上下方向に傾けるものであって、投射コンベア8とコンベア支持台車9との間に配置された複数のジャッキ14から構成されている。
このとき投射コンベア8から投射された粉原料15は、図3(b)に示す位置Aに落下する。この位置Aはドラムミキサー3に装入された擬似粒子群16の裾野を外れた位置であり、投射コンベア8から投射された粉原料15はドラムミキサー3の内周面上に落下する。
また、投射コンベア8の俯仰角度が所定の角度となるように投射コンベア8をコンベア傾斜機構12により傾斜させると、投射コンベア8から投射される粉原料15の水平到達距離が投射コンベア8を傾斜させない場合と比較して長くなるので、投射コンベア8により搬送される粉原料15の搬送速度を小さくしてコーティング用ドラムミキサー3の内部に粉原料15を投射することができる。
さらにまた、粉原料15をドラムミキサー3に装入する際に粉原料投射装置7の投射コンベア8をドラムミキサー3に装入された擬似粒子群16の上方位置から外れた位置に移動させることで、ドラムミキサー3の内面から落下する落下物の落下衝撃を受けない位置に投射コンベア8が位置することになるため、投射コンベア8の先端部をコーティング用ドラムミキサー3の内部に挿入したとしても、投射コンベア8が損傷を受けることが軽減される。
さらに、ドラムミキサーによる造粒の場合は、ドラムミキサーの排出側に固体燃料系粉原料や石灰石系粉原料を供給することによりドラムミキサー自体がコーティング用ドラムミキサーと同じ機能を果たすことになる。
本発明によると、堆積面の上層部に存在する粗粒造粒物への外装材(石灰石系粉原料や固体燃料系粉原料)の付着過多を抑制できることを示している。
図7中実線aは投射コンベア8を水平にした状態で粉原料を240m/minの速度で投射した場合を示し、一点鎖線bはコーティング用ドラムミキサー3の内部に突出する投射コンベア8の突出量を300mmにした状態で粉原料を210m/minの速度で投射した場合を示している。
図7に示されるように、投射コンベア8の俯仰角度を25度にすると、投射コンベア8の速度が210m/minであっても粉原料の水平到達距離がドラムミキサー内の擬似粒子に届く距離となることがわかる。
コーティング用ドラムミキサー3の装入側より、石灰石系粉原料15Bが投射され、コーティング用ドラムミキサー3内に装入された擬似粒子群16の裾野を外れた位置に石灰石系粉原料15Bを投射する。一方、固体燃料系粉原料である粉コークス15Aは、コーティング用ドラムミキサー3の排出側から投射し、コーティング用ドラムミキサー3内の擬似粒子群16の裾野を外れた位置に粉コークス15Aを投射する。
この場合も、粉コークス・石灰石系粉原料のコーティングを行う場合は、石灰石系粉原料および固体燃料系粉原料である粉コークスを予め混合、あるいは投射コンベア8のベルト上に同時切り出しにより積層状態とし、単一の投射コンベア8により、造粒用ドラムミキサー1B内に投射する形態、または、石灰石系粉原料および固体燃料系粉原料である粉コークスをそれぞれ別の投射コンベア8を用いて投射すればよく、図17に示すように、造粒用ドラムミキサー1Bの排出側から石灰石系粉原料15B、粉コークス15Aを投射すればよく、図中の投射コンベア8で石灰石系粉原料を粉コークスより遠方に投射し、石灰石系粉原料の投射コンベア8より下方に配した別の投射コンベア(図示省略)により、近傍位置となる粉コークス15Aを石灰石系粉原料より排出側となる位置に投射することで達成される。混合用ドラムミキサー1Aとしてはドラム長さが12~20mのドラムミキサーを使用でき、造粒用ドラムミキサー1Bとしてはドラム長さが混合用ドラムミキサーより長いドラムミキサー、例えばドラム長さが16~25mのドラムミキサーを使用できる。
図20に示す第10の実施形態では、鉄鉱石、SiO2含有原料をドラムミキサー17で造粒し、ドラムミキサー17の排出側で疑似粒子表面に固体燃料系粉原料である粉コークスと石灰石系粉原料のコーティングが行われる。
なお、単一のドラムミキサー17は、ドラム長さが20~25mのドラムミキサーを使用でき、焼結原料の造粒用時間を300~500秒に確保することで、混合・造粒を行うことができる。
なお、図21の「+8.0mm」、「+4.75mm」、「+2.75mm」、「+1.0mm」、「+0.5mm」、「+0.25mm」は粒子径が8.0mm以上、4.75mm以上、2.75mm以上、1.0mm以上、0.5mm以上、0.25mm以上の焼結原料を示し、「-0.25mm」は粒子径が0.25mm未満の焼結原料を示している。また、CaO濃度の調査は、図12または図14に示す装置を用いて行った。
従来法で得られた焼結原料のCaO濃度と本発明方法で得られた焼結原料のCaO濃度とを比較すると、本発明方法で得られた焼結原料のうち粒子径が8.0mm以上のものと、4.75mm以上のものは、従来法で得られた焼結原料よりもCaO濃度が低くなることが判明した。
これらのことから、本発明法では、粗粒擬似粒子の表面に石灰石系粉原料が過剰に付着することを抑制することができ、被還元性・強度に優れたヘマタイト組織を多く存在させ、さらにカルシウムフェライト組織を生成させることができることがわかった。
1B…造粒用ドラムミキサー
2…ディスクペレタイザー
3…コーティング用ドラムミキサー
4…石灰石系粉原料投射装置
5…固体燃料系粉原料投射装置
6…ドワイトロイド式焼結機
61…コンベア
62…ブロワー
63…点火炉
7…粉原料投射装置
8…投射コンベア
9…コンベア支持台車
10…ガイドレール
11…ガイドレール支持台車
12…コンベア昇降機構
13…走行車輪
14…ジャッキ
15…粉原料
16…擬似粒子群
16a…粗粒擬似粒子
17…ドラムミキサー
Claims (14)
- 鉄鉱石を主原料とし、かつSiO2含有原料および石灰石系粉原料や固体燃料系粉原料を副原料とする焼結原料をディスクペレタイザーで造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造する焼結鉱の製造方法であって、前記焼結原料の内、前記鉄鉱石と前記SiO2含有原料とからなる原料を前記ディスクペレタイザーに装入して造粒し、次いで造粒後の擬似粒子をコーティング用ドラムミキサーに装入し、前記石灰石系粉原料および/または前記固体燃料系粉原料を投射する粉原料投射装置を前記ドラムミキサーに装入された擬似粒子群の上方位置から外れた位置に移動させた後、前記粉原料を前記ドラムミキサーに装入することを特徴とする焼結鉱の製造方法。
- 鉄鉱石を主原料とし、かつSiO2含有原料および石灰石系粉原料や固体燃料系粉原料を副原料とする焼結原料をドラムミキサーで造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造する焼結鉱の製造方法であって、前記焼結原料の内、前記鉄鉱石と前記SiO2含有原料とからなる原料を前記ドラムミキサーに装入して造粒し、次いで造粒後の擬似粒子をコーティング用ドラムミキサーに装入し、前記石灰石系粉原料および/または前記固体燃料系粉原料を投射する粉原料投射装置を前記ドラムミキサーに装入された擬似粒子群の上方位置から外れた位置に移動させた後、前記粉原料を前記ドラムミキサーに装入することを特徴とする焼結鉱の製造方法。
- 鉄鉱石を主原料とし、かつSiO2含有原料および石灰石系粉原料や固体燃料系粉原料を副原料とする焼結原料をドラムミキサーで造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造する焼結鉱の製造方法であって、前記焼結原料の内、前記鉄鉱石と前記SiO2含有原料とからなる原料を前記ドラムミキサーに装入して造粒し、次いで前記ドラムミキサーの排出側に前記石灰石系粉原料および/または前記固体燃料系粉原料を投射する粉原料投射装置を前記ドラムミキサーに装入された擬似粒子群の上方位置から外れた位置に移動させた後、前記粉原料を前記ドラムミキサーに装入することを特徴とする焼結鉱の製造方法。
- 前記粉原料投射装置の移動位置が前記擬似粒子群の裾野を外れた位置であることを特徴とする請求項1~3のいずれか一項に記載の焼結鉱の製造方法。
- 前記粉原料投射装置として、前記粉原料を前記ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車と、を有するものを用い、前記投射コンベア、前記コンベア支持台車および前記ガイドレールを前記ガイドレール支持台車により所定位置に移動させた後、前記粉原料を前記ドラムミキサーに装入することを特徴とする請求項1~3のいずれか一項に記載の焼結鉱の製造方法。
- 前記粉原料投射装置として、前記コンベア支持台車に対して前記投射コンベアを上下方向に傾けるコンベア傾斜機構を有するものを用い、前記投射コンベアの先端部が上向きになるように前記投射コンベアを前記コンベア傾斜機構により傾斜させた後、前記粉原料を前記ドラムミキサーに装入することを特徴とする請求項5に記載の焼結鉱の製造方法。
- 前記コーティング用ドラムミキサーの内部に前記粉原料を前記ドラムミキサーの出口側から装入することを特徴とする請求項1~6のいずれか一項に記載の焼結鉱の製造方法。
- 前記コーティング用ドラムミキサーの内部に前記粉原料を前記ドラムミキサーの入口側から装入することを特徴とする請求項1~6のいずれか一項に記載の焼結鉱の製造方法。
- 鉄鉱石を主原料とし、かつSiO2含有原料、石灰石系粉原料および固体燃料系粉原料を副原料とする焼結原料を造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造される焼結鉱の製造設備であって、
前記焼結原料を造粒するディスクペレタイザーと、前記焼結原料の表面をコーティングするコーティング用ドラムミキサーと、該ドラムミキサーの内部に粉原料を投射する粉原料投射装置とを備え、
前記粉原料を前記コーティング用ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記コーティング用ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記コーティング用ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを前記粉原料投射装置が有することを特徴とする焼結鉱の製造設備。 - 鉄鉱石を主原料とし、かつSiO2含有原料、石灰石系粉原料および固体燃料系粉原料を副原料とする焼結原料を造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造する焼結鉱の製造設備であって、
前記焼結原料を造粒するドラムミキサーと、前記焼結原料の表面をコーティングするコーティング用ドラムミキサーと、該コーティング用ドラムミキサーの内部に粉原料を投射する粉原料投射装置とを備え、
前記粉原料を前記コーティング用ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記コーティング用ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記コーティング用ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを前記粉原料投射装置が有することを特徴とする焼結鉱の製造設備。 - 鉄鉱石を主原料とし、かつSiO2含有原料、石灰石系粉原料および固体燃料系粉原料を副原料とする焼結原料を造粒し、造粒された焼結原料をドワイトロイド式焼結機により焼成して製造される焼結鉱の製造設備であって、
前記焼結原料を造粒するドラムミキサーと、該造粒するドラムミキサーの排出側からドラムミキサー内部に粉原料を投射する粉原料投射装置とを備え、
前記粉原料を前記ドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを前記粉原料投射装置が有することを特徴とする焼結鉱の製造設備。 - 前記コンベア支持台車に対して前記投射コンベアを上下方向に傾けるコンベア傾斜機構をさらに備えたことを特徴とする請求項9~11のいずれか一項に記載の焼結鉱の製造設備。
- 焼結鉱を製造するときに用いられる粉原料投射装置であって、前記焼結鉱の副原料である固体燃料系粉原料または石灰石系粉原料をドラムミキサーの内部に搬送して投射する投射コンベアと、該投射コンベアを前記ドラムミキサーの軸方向に移動可能に支持するコンベア支持台車と、該コンベア支持台車を前記ドラムミキサーの軸方向に案内する左右一対のガイドレールと、該ガイドレールを前記ドラムミキサーの軸方向と直交する横方向に移動可能に支持するガイドレール支持台車とを備えたことを特徴とする粉原料投射装置。
- 前記コンベア支持台車に対して前記投射コンベアを上下方向に傾けるコンベア傾斜機構をさらに備えたことを特徴とする請求項13に記載の粉原料投射装置。
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