WO2013014926A1 - Method for manufacturing sintered ore and manufacturing equipment for same, and apparatus for projecting powdered raw material - Google Patents

Abstract

The present invention provides a method for manufacturing sintered ore allowing manufacturing of sintered ore ideal as raw material for a blast furnace. When a drum mixer (3) is charged with powdered raw material (15) used for a quasi-particle coating, after a projection conveyor (8) for projecting the powdered raw material (15) into the drum mixer (3) is moved to a position away from a position above the quasi-particles (16) charged in the drum mixer (3), the powdered raw material (15) is projected into the drum mixer (3), preventing the powdered raw material (15) from falling from the projection conveyor (8) onto the quasi-particles (16).

Description

Sintered ore manufacturing method and manufacturing equipment, and powder raw material projection apparatus

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. For example, there is a positive correlation between the reducibility of the sintered ore and the gas utilization rate in the blast furnace, and 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. In addition, 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.

Therefore, 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. In addition, when granulating 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 In addition to charging the sintering raw material, 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 method of granulating a sintered raw material by attaching to a glass is described.

Further, in Patent Document 3, 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 In order to increase the width and adhere to the outer surface of the pseudo particles, 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.

In 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.

Japanese Patent No. 3755452 Japanese Patent No. 3656632 International Publication WO2004 / 055224 Pamphlet JP 2011-32577 A

According to the methods described in Patent Documents 1 to 4, it is possible to produce a blast furnace sinter having excellent reducibility and high cold strength, but there are the following problems. That is, when a powder raw material such as a limestone powder raw material or a solid fuel powder raw material is projected onto the drum mixer 3 from the projection conveyor 8 shown in FIG. 23 (a), most of the powder raw material 15 projected from the projection conveyor 8 is It falls on the pseudo-particle group 16 charged and granulated in the drum mixer 3 before the powder raw material 15. At this time, if coarse quasi particles 16a are present in the quasi-particle group 16, the powder raw material 15 falling on the quasi-particle groups 16 is excessively adhered to the surface of the coarse quasi-particle 16a from the drum mixer 3. Discharged. Furthermore, deposits are likely to be generated on the inner surface of the drum mixer 3, and when deposits that have adhered to the inner surface of the drum mixer 3 grow, the adhesion of the deposits themselves and the centrifugal force generated by the rotation of the drum mixer 3 cause the drum mixer 3 to move. The adhering matter 16b adhering to the inner surface tends to fall on the projection conveyor 8. For this reason, when supplying the powder raw material 15 from the exit side of the drum mixer 3 by the projection conveyor 8, it is necessary to project from a distance so that the tip of the projection conveyor 8 is not located inside the drum mixer 3.

Further, as shown in FIG. 23B, 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 α, 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.

In order to achieve the above object, 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.
(1) 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, 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 among the sintered raw materials is charged into the disk pelletizer. 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.

(2) 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.

(3) 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 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. A powder raw material projecting device for projecting the limestone powder raw material and / or the solid fuel powder raw material onto the discharge side of the drum mixer, and from above the pseudo particle group charged in 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 detached position.

(4) The method for producing a sintered ore according to any one of (1) to (3), wherein the moving position of the powder raw material projection device is a position outside the base of the pseudo particle group.
(5) As the powder material projection device, a projection conveyor that conveys and projects the powder material into the drum mixer, and 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 for guiding the conveyor support carriage in the axial direction of the drum mixer; and a guide rail support carriage for supporting the guide rail in a lateral direction perpendicular to the axial direction of the drum mixer. (1), after the projecting conveyor, the conveyor support carriage, and the guide rail are moved to predetermined positions by the guide rail support carriage, the powder raw material is charged into the drum mixer. A method for producing a sintered ore according to any one of (3) to (3).

(6) As said powder raw material projection apparatus, what has a conveyor inclination mechanism which inclines the said projection conveyor to an up-down direction with respect to the said conveyor support cart, The said projection conveyor is used so that the front-end | tip part of the said projection conveyor may face upwards After tilting by the conveyor tilting mechanism, the powder raw material is charged into the drum mixer, and the method for producing a sintered ore according to (5),
(7) The method for producing a sintered ore according to any one of (1) to (6), wherein the powder raw material is charged into the coating drum mixer from the outlet side of the drum mixer.

(8) The method for producing a sintered ore according to any one of (1) to (6), wherein the powder raw material is charged into the coating drum mixer from the inlet side of the drum mixer.
(9) Granulating a sintered raw material containing iron ore as a main raw material and using a SiO ₂ -containing raw material, a limestone powder raw material, and a solid fuel powder raw material as auxiliary raw materials, It is a production facility for sintered ore produced by firing with a sintering machine,
A disk pelletizer for granulating the sintered raw material, a coating drum mixer for coating the surface of the sintered raw material, and a powder raw material projecting device for projecting the powder raw material into the drum mixer,
A projection conveyor that transports and projects the powder raw material into the coating drum mixer, a conveyor support carriage that supports the projection conveyor in an axial direction of the coating drum mixer, and the conveyor support carriage. 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:

(10) Granulating a sintered raw material containing iron ore as a main raw material and using an SiO ₂ -containing raw material, a limestone powder raw material, and a solid fuel-based powder raw material as a secondary raw material, It is a production facility for sintered ore produced by firing with a sintering machine,
A drum mixer for granulating the sintered raw material, a coating drum mixer for coating the surface of the sintered raw material, and a powder raw material projecting device for projecting the powder raw material into the coating drum mixer,
A projection conveyor that transports and projects the powder raw material into the coating drum mixer, a conveyor support carriage that supports the projection conveyor in an axial direction of the coating drum mixer, and the conveyor support carriage. 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:

(11) Granulating a sintered raw material containing iron ore as a main raw material and using an SiO ₂ -containing raw material, a limestone powder raw material, and a solid fuel-based powder raw material as auxiliary raw materials, It is a production facility for sintered ore produced by firing with a sintering machine,
A drum mixer for granulating the sintered raw material, and a powder raw material projecting device for projecting the powder raw material into the drum mixer from the discharge side of the granulating drum mixer,
A projection conveyor that transports and projects the powder raw material into the drum mixer, a conveyor support carriage that supports the projection conveyor so as to be movable in the axial direction of the drum mixer, and a shaft of the drum mixer that supports the conveyor support carriage 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.

(12) 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.
(13) 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.
(14) The powder raw material projecting apparatus according to (13), further comprising a conveyor tilting mechanism that tilts the projection conveyor in the vertical direction with respect to the conveyor support carriage.

According to the inventions of (1) to (10), it is possible to prevent the powder raw material from falling on the pseudo particle group charged and granulated when the powder raw material is charged into the drum mixer, Since the powder raw material projected from the powder raw material projection device falls on the inner peripheral surface of the drum mixer, the powder raw material projected from the powder raw material projection device is deposited on the pseudo particle deposition layer on the inner peripheral surface of the drum mixer. It is possible to suppress discharge from the drum mixer while staying in the tank. As a result, when the outer surface of the pseudo particles is coated with a solid fuel powder raw material such as powder coke or a limestone powder raw material, the outer surface of the pseudo particles is not affected by the particle size of the pseudo particles. Since it becomes possible to coat with a limestone powder raw material, it is possible to produce a good sintered ore as a blast furnace raw material.

According to the inventions of (11) and (12), 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. 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.
According to the inventions of (13) and (14), it is possible to provide 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.

It is a figure which shows an example of a sintered ore manufacturing equipment. It is a figure which shows an example of a powder raw material projector. It is a figure for demonstrating the effect | action of the powder raw material projector shown in FIG. It is a figure for demonstrating one Embodiment in the case of mixing and granulating the sintering raw material except the limestone type powder raw material and the solid fuel type powder raw material with a drum mixer. It is a figure which shows the result of having investigated the outer surface of the pseudo particle discharged | emitted from the drum mixer. It is a figure which shows the result of having investigated the relationship between the powder raw material conveyance speed of the projection conveyor shown in FIG. 2, and the coating time which coats the surface of a pseudo particle with the powder raw material projected from the projection conveyor. It is a figure which shows the result of having investigated the relationship between the horizontal arrival distance of the powder raw material projected from the projection conveyor of the powder raw material projection apparatus shown in FIG. 2, and the fall height of the powder raw material from a projection conveyor front-end | tip. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 2nd Embodiment of this invention. It is a figure which shows the projection position of the limestone type powder raw material and solid fuel type powder raw material which are projected in the drum mixer for coating in 2nd Embodiment. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 3rd Embodiment of this invention. It is a figure which shows the projection position of the limestone type powder raw material and solid fuel type powder raw material which are projected in the drum mixer for coating in 3rd Embodiment. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 4th Embodiment of this invention. It is a figure which shows the projection position of the limestone type powder raw material and solid fuel type powder raw material which are projected in the drum mixer for coating in 4th Embodiment. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 5th Embodiment of this invention. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 6th Embodiment of this invention. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 7th Embodiment of this invention. It is a figure which shows the projection position of the limestone type powder raw material and solid fuel type powder raw material which are projected in the drum mixer for granulation in 7th Embodiment. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 8th Embodiment of this invention. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 9th Embodiment of this invention. It is a figure which shows the manufacturing method of the sintered ore which concerns on the 10th Embodiment of this invention. It is a figure which shows the CaO density | concentration of the sintering raw material granulated by the conventional method, and the sintering raw material granulated by the method of this invention. It is a figure which shows the abundance ratio of the hematite structure | tissue which exists in the sintering raw material after baking, a magnetite structure | tissue, a calcium ferrite structure | tissue, and a silicate slag structure | tissue. It is a figure for demonstrating the problem of a prior art.

Embodiments of the present invention will be described below with reference to FIGS.
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.

In the case of producing a blast furnace sinter with the sinter production facility shown in FIG. 1, first, the main raw material of the sinter is charged into the mixing drum mixer 1 together with the SiO ₂ -containing raw material. Next, 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. Then, 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.

Thus, when the pseudo particles containing no limestone powder raw material and solid fuel powder raw material are granulated by the disk pelletizer 2, the granulated pseudo particles are charged into the coating drum mixer 3, and the coating drum The mixer 3 is rotated. Next, 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. And the sintering raw material discharged | 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. And if the projection conveyor 8 moves to a predetermined position, the powder raw material 15 will be projected from the projection conveyor 8 to the inside of the drum mixer 3 for coating.
At this time, 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.

When 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. As the drum mixer 3 rotates, the drum mixer 3 relatively moves in the circumferential direction. When the powder raw material 15 relatively moved in the circumferential direction of the drum mixer 3 reaches the position B shown in FIG. 3B, 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. At this time, 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.

As described above, when the powder raw material 15 such as the limestone powder raw material or the solid fuel powder raw material is charged into the drum mixer 3, the position above the pseudo particle group 16 in which the powder raw material projecting device 7 is charged into the drum mixer 3. When the powder raw material 15 is charged into the drum mixer 3 after being moved to a position deviated from the position, 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. . Thereby, 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. In addition, it is possible to granulate a sintered raw material having the powder raw material 15 uniformly attached to the surface. Therefore, 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.

Moreover, 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. There is an advantage that the position becomes acceptable.
Further, when 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.

Further, it is possible to ensure the falling position of the powder raw material 15 at a predetermined position without inserting the tip end portion of the projection conveyor 8 into the coating drum mixer 3 deeply. It is possible to prevent the projection conveyor 8 from being damaged by falling objects falling from the inner surface.
Furthermore, when the powder raw material 15 is charged into the 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.

In addition, the example shown in 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. The same applies to the case where the solid raw material powder material or the limestone powder material is coated on the sintered raw material which is granulated and made into pseudo particles, and a coating drum mixer can be used.
Furthermore, in the case of granulation by a drum mixer, 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.

That is, among the sintered raw materials, 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. In the case of FIG. 4, 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. Are pseudo-particles. 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.

In addition, 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. In this case, 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. Further, “+8.0 mm” in FIG. 5 indicates a pseudo particle having a particle diameter of 8.0 mm or more, and “−0.25 mm” indicates a pseudo particle having a particle diameter of less than 0.25 mm.

When the projection conveyor 8 is at the position shown in FIG. 23 (a), as shown in FIG. 5 (a), among the pseudo particles charged in the coating drum mixer 3, the particle diameter is 4.75 mm or more. A lot of powder coke adheres. On the other hand, when 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. This is because, within the drum mixer, particle size segregation occurs on the accumulation surface of the granulated material (pseudo particles), and there are many coarse particles in the upper layer of the deposition surface, and fine particles in the lower layer of the deposition surface. It is known that there are many.
According to the present invention, it is shown that excessive adhesion of the exterior material (limestone powder raw material or solid fuel powder raw material) to the coarse granulated material existing in the upper layer portion of the deposition surface can be suppressed.

Therefore, by using 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. When 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. As described above, when 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.

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.
In FIG. 7, 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, and 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.

Moreover, 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

Accordingly, as described above, 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.

In the above-described first embodiment of the present invention, 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. Although 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. Is the same in that In the embodiment shown in FIG. 8, 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. Then, in 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. As a result, 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. Although it is the same as the embodiment, in the third embodiment shown in FIG. 10, 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. On the other hand, in 4th Embodiment shown in FIG. 12, the powder coke which is a solid fuel type | system | 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.

In the embodiment shown in FIGS. 10 and 12, 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.

In the use of the coating drum mixer 3 shown in FIG. 8, the limestone powder raw material is projected from the charging side of the coating drum mixer 3, and the powder coke, which is a solid fuel powder raw material, is projected from the discharge side. 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. . On the other hand, 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. .

In the embodiment shown in FIGS. 10 and 12, 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.

In the case of coating the limestone powder raw material on the surface of the pseudo particles and the powder coke layer on the outermost layer of the pseudo particles, in the embodiment shown in FIG. 10, as shown in FIG. The projection raw material 15B and the powder coke 15A are projected, the limestone powder raw material 15B is projected into the coating drum mixer 3, and the powder coke 15A is projected onto the portion located on the discharge side, and the projection conveyor for projecting the powder coke 15A. This is achieved by projecting the limestone powder raw material 15B at a position lower than 8 by another projection conveyor (not shown).

In the embodiment shown in FIG. 12, as shown in FIG. 13, the limestone powder raw material and the powder coke are respectively projected from the discharge side of the coating drum mixer 3, and the limestone powder raw material 15B, What is necessary is just to project the powder coke 15A to the part which becomes a discharge | emission side position, and the projection of the limestone type powder raw material 15B which goes far away using the limestone type powder raw material projection conveyor 8 and the powder coke projection conveyor (illustration omitted) is a limestone type. What is necessary is just to perform the projection of the powder coke 15A which becomes the vicinity with the powder raw material projection conveyor 8 with the powder coke projection conveyor (illustration omitted) arrange | positioned below the limestone type powder raw material projection conveyor 8. FIG. 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. Moreover, when using a long drum mixer as the coating drum mixer 3, 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. On the discharge side of the drum mixer 1B for granulation, 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. In the fifth embodiment shown in FIG. 14, 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, On the discharge side of the granulating drum mixer 1B, 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. In the case of using the mixing drum mixer 1A and the granulating drum mixer 1B as this drum mixer, instead of projecting the powder coke which is a solid fuel system powder material, as shown in FIGS. 15 and 16, a limestone powder material It can be replaced with the projection.

In the sixth embodiment shown in FIG. 15, 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.

Further, in 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. 17, 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. As the mixing drum mixer 1A, a drum mixer having a drum length of 12 to 20 m can be used. As the granulating drum mixer 1B, 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. In the eighth embodiment shown in FIG. 18, 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.

In the ninth embodiment shown in FIG. 19, 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.
In the tenth embodiment shown in FIG. 20, 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. ing. 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.

Further, among 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.

Next, in order to investigate the influence of the adhesion state of the limestone powder raw material on the sintering properties, 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 | pulverized and the existing ratio of the hematite structure | tissue, the magnetite structure | tissue, the calcium ferrite structure | tissue, and the silicate slag structure | tissue was computed by the powder X-ray analysis method. The results are shown in Table 1 and FIG.

Comparing the sintered raw material obtained by the conventional method and the sintered raw material obtained by the method of the present invention, in the conventional method, the existing ratio of the hematite structure after firing is about 60% when the particle diameter is 8.0 mm or more. Whereas the particle diameter of 4.75 mm is about 40%, in the method of the present invention, 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%.

In the conventional method, 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.
From these facts, in the method of the present invention, it is possible to suppress the excessive adhesion of the limestone powder raw material to the surface of the coarse pseudo-particles, and a large amount of hematite structure excellent in reducibility and strength can be present. It was found that a calcium ferrite structure can be generated.

DESCRIPTION OF SYMBOLS 1,1A ... Drum mixer for mixing 1B ... Drum mixer for granulation 2 ... Disc pelletizer 3 ... Drum mixer for coating 4 ... Limestone type powder raw material projection apparatus 5 ... Solid fuel type powder raw material projection apparatus 6 ... Dwightroid type sintering machine DESCRIPTION OF SYMBOLS 61 ... Conveyor 62 ... Blower 63 ... Ignition furnace 7 ... Powder raw material projection apparatus 8 ... Projection conveyor 9 ... Conveyor support trolley 10 ... Guide rail 11 ... Guide rail support trolley 12 ... Conveyor raising / lowering mechanism 13 ... Traveling wheel 14 ... Jack 15 ... Powder Raw material 16 ... Pseudo particle group 16a ... Coarse grain pseudo particle 17 ... Drum mixer

Claims (14)

1. 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, and the granulated sintered raw material is dweroid type A method for producing a sintered ore produced by firing with a sintering machine, wherein among the sintered raw materials, a raw material comprising the iron ore and the SiO ₂ -containing raw material is charged into the disk pelletizer and granulated. Then, the pseudo particles after granulation are charged into a drum mixer for coating, 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 particle group.
2. Sintered raw material with 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 material is granulated with a drum mixer, and the granulated sintered raw material is dweroid type A method for producing sintered ore that is produced by firing with a sintering machine, wherein a raw material composed of the iron ore and the SiO ₂ -containing raw material is charged into the drum mixer and granulated. Then, the pseudo particles after granulation are charged into a drum mixer for coating, 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 particle group.
3. Sintered raw material with 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 material is granulated with a drum mixer, and the granulated sintered raw material is dweroid type A method for producing sintered ore that is produced by firing with a sintering machine, wherein a raw material composed of the iron ore and the SiO ₂ -containing raw material is charged into the drum mixer and granulated. Then, the position where the powder raw material projection device for projecting the limestone powder raw material and / or the solid fuel powder raw material onto the discharge side of the drum mixer is out of the upper position of the pseudo particle group charged in the drum mixer. After moving to, the said powder raw material is charged into the said drum mixer, The manufacturing method of the sintered ore characterized by the above-mentioned.
4. The method for producing a sintered ore according to any one of claims 1 to 3, wherein the movement position of the powder raw material projection device is a position outside the base of the pseudo particle group.
5. As the powder raw material projection device, a projection conveyor that conveys and projects the powder raw material into the drum mixer, a conveyor support carriage that supports the projection conveyor movably in the axial direction of the drum mixer, and the conveyor support Using a pair of left and right guide rails for guiding the carriage in the axial direction of the drum mixer, and a guide rail support carriage for supporting the guide rails in a lateral direction perpendicular to the axial direction of the drum mixer The powder raw material is charged into the drum mixer after the projection conveyor, the conveyor support carriage, and the guide rail are moved to predetermined positions by the guide rail support carriage. The manufacturing method of the sintered ore as described in any one of Claims.
6. As the powder raw material projecting device, a device having a conveyor tilting mechanism that tilts the projection conveyor in the vertical direction with respect to the conveyor support carriage, and tilting the projection conveyor so that the front end portion of the projection conveyor faces upward 6. The method for producing a sintered ore according to claim 5, wherein the powder raw material is charged into the drum mixer after being tilted by a mechanism.
7. The method for producing a sintered ore according to any one of claims 1 to 6, wherein the powder raw material is charged into the coating drum mixer from the outlet side of the drum mixer.
8. The method for producing a sintered ore according to any one of claims 1 to 6, wherein the powder raw material is charged into the coating drum mixer from the inlet side of the drum mixer.
9. A granulated sintered raw material containing iron ore as the main raw material and SiO ₂ -containing raw material, limestone powder raw material and solid fuel powder raw material as auxiliary raw materials, and the granulated sintered raw material as a Dwightroid type sintering machine A sintered ore production facility manufactured by firing with:
   A disk pelletizer for granulating the sintered raw material, a coating drum mixer for coating the surface of the sintered raw material, and a powder raw material projecting device for projecting the powder raw material into the drum mixer,
   A projection conveyor that transports and projects the powder raw material into the coating drum mixer, a conveyor support carriage that supports the projection conveyor in an axial direction of the coating drum mixer, and the conveyor support carriage. 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:
10. A granulated sintered raw material containing iron ore as the main raw material and SiO ₂ -containing raw material, limestone powder raw material and solid fuel powder raw material as auxiliary raw materials, and the granulated sintered raw material as a Dwightroid type sintering machine A sintered ore production facility that is fired and manufactured by:
    A drum mixer for granulating the sintered raw material, a coating drum mixer for coating the surface of the sintered raw material, and a powder raw material projecting device for projecting the powder raw material into the coating drum mixer,
    A projection conveyor that transports and projects the powder raw material into the coating drum mixer, a conveyor support carriage that supports the projection conveyor in an axial direction of the coating drum mixer, and the conveyor support carriage. 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:
11. A granulated sintered raw material containing iron ore as the main raw material and SiO ₂ -containing raw material, limestone powder raw material and solid fuel powder raw material as auxiliary raw materials, and the granulated sintered raw material as a Dwightroid type sintering machine A sintered ore production facility manufactured by firing with:
    A drum mixer for granulating the sintered raw material, and a powder raw material projecting device for projecting the powder raw material into the drum mixer from the discharge side of the granulating drum mixer,
    A projection conveyor that transports and projects the powder raw material into the drum mixer, a conveyor support carriage that supports the projection conveyor so as to be movable in the axial direction of the drum mixer, and a shaft of the drum mixer that supports the conveyor support carriage 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.
12. The sintered ore manufacturing facility according to any one of claims 9 to 11, further comprising a conveyor tilting mechanism that tilts the projection conveyor in a vertical direction with respect to the conveyor support carriage.
13. A powder raw material projecting apparatus used when manufacturing sintered ore, a projection conveyor for conveying and projecting a solid fuel-based powder raw material or a limestone-based powder raw material that is a secondary raw material of the sintered ore into a drum mixer A conveyor support carriage that supports the projection conveyor movably 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 A powder raw material projection apparatus comprising a guide rail support carriage that is supported so as to be movable in a lateral direction orthogonal to the axial direction of the mixer.
14. The powder raw material projecting apparatus according to claim 13, further comprising a conveyor tilting mechanism that tilts the projection conveyor in a vertical direction with respect to the conveyor support carriage.
    

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