WO2023210411A1

WO2023210411A1 - Granulation device, method for producing granulation sintering raw material, and method for producing sintered ore

Info

Publication number: WO2023210411A1
Application number: PCT/JP2023/015186
Authority: WO
Inventors: 友司岩見; 頌平藤原; 隆英樋口; 佑治今井
Original assignee: Ｊｆｅスチール株式会社
Priority date: 2022-04-28
Filing date: 2023-04-14
Publication date: 2023-11-02
Also published as: JPWO2023210411A1; TW202346607A

Abstract

Provided are: a granulation device capable of efficiently heating a sintering raw material by blowing steam into the sintering raw material; a method for producing a granulation sintering raw material; and a method for producing a sintered ore using the method for producing a granulation sintering raw material.　This granulation device granulates a sintering raw material including an iron-containing material, a CaO-containing raw material, and a coagulation material. The granulation device has: a cylindrical drum that rotates around the horizontal direction as a rotation axis and is provided with an inlet through which the sintering raw material is put in, and a discharge port through which the granulated sintering raw material is discharged; a steam pipe provided inside the drum and provided only in an anterior half portion between the inlet and the intermediate position between the inlet and the discharge port; and multiple nozzles which are connected to the steam pipe and from which steam is ejected toward a deposition surface of the sintering raw material, wherein the multiple nozzles are provided 500 mm or more apart from the deposition surface of the sintering raw material.

Description

Granulation equipment, method for producing granulated and sintered raw materials, and method for producing sintered ore

The present invention relates to a granulation device for granulating sintered raw materials, a method for producing granulated sintered raw materials, and a method for producing sintered ore.

Sintered ore, which is a raw material for blast furnaces, is generally made up of iron-containing raw materials such as iron ore powder, recovered powder in steel works, and sintered ore unsieved powder, CaO-containing raw materials such as limestone and dolomite, and charcoal such as coke powder and anthracite. (solid fuel) as a sintering raw material using a Dwight Lloyd sintering machine (hereinafter sometimes referred to as a "sintering machine"), which is an endless moving sintering machine. The sintering raw material is charged into an endlessly movable pallet of the sintering machine to form a charging layer. The thickness (height) of the charging layer is approximately 400 to 800 mm. Thereafter, the coal material on the surface layer of the charging layer is ignited by an ignition furnace installed above the charging layer. The carbonaceous material in the charging layer is sequentially combusted by sucking air downward through a wind box placed under the pallet. This combustion progresses progressively lower and forward as the pallet moves. The combustion heat generated at this time burns and melts the sintering raw material, producing a sintered cake. Thereafter, the obtained sintered cake is crushed in an ore discharge section, cooled in a cooler, and sized to become a finished sintered ore.

In the production of sintered ore using the above-mentioned sintering machine, the sintered raw material is preheated and dried to reduce the proportion of the wet zone in the charging layer and improve the permeability of the charging layer. Technologies that improve productivity are known. For example, Patent Document 1 discloses a method for producing a granulated sintering raw material, in which steam such as water vapor is blown into the sintering raw material during granulation to heat the sintering raw material. According to Patent Document 1, by granulating the sintered raw material while blowing water vapor into it, the sintered raw material is preheated and dried, improving the permeability of the charging layer and improving the production rate of sintered ore. .

International Publication 2019/167888

In the method disclosed in Patent Document 1, the sintering raw material is granulated while blowing steam, so it is necessary to separately prepare steam to be blown into the sintering raw material. Therefore, there has been a problem in that the manufacturing cost of sintered ore increases due to the cost required to prepare the steam. On the other hand, if steam can be used to efficiently heat the sintering raw material, the amount of steam used can be reduced, and an increase in the manufacturing cost of sintered ore can be suppressed. The present invention has been made in view of the problems of the prior art, and its purpose is to provide a granulation device and a granulation/sintering device that can efficiently heat the sintering raw material by blowing steam into the sintering raw material. It is an object of the present invention to provide a method for producing a raw material and a method for producing sintered ore using the method for producing the granulated and sintered raw material.

The means for solving the above problems are as follows.
[1] A granulator for granulating sintering raw materials including an iron-containing raw material, a CaO-containing raw material, and a coagulant, which includes an input port into which the sintering raw materials are input, and an outlet from which the granulated sintering raw materials are discharged. a cylindrical drum that rotates with the horizontal direction as an axis of rotation; It has a steam pipe provided only in the first half, and a plurality of nozzles that are connected to the steam pipe and eject steam onto the deposition surface of the sintering raw material, and the plurality of nozzles are configured to prevent the deposition of the sintering raw material. A granulation device installed at a distance of 500 mm or more from the surface.
[2] Among the plurality of nozzles, more than half of the nozzles are provided so that the steam jetting directions are inclined toward the discharge port side, and the steam jetting directions of the remaining nozzles are provided with respect to the deposition surface of the sintering raw material. The granulation device according to [1], which is installed so that steam is ejected vertically.
[3] The granulation device according to [1] or [2], wherein the steam ejection direction of the plurality of nozzles is tilted so that as the position of the nozzle approaches the discharge port, it becomes larger toward the discharge port side. .
[4] A method for producing a granulated sintered raw material, in which a sintered raw material containing an iron-containing raw material, a CaO-containing raw material, and a coagulating material is granulated using a granulating device, the granulating device A cylindrical drum is provided with an input port into which granulated sintering raw material is input, and a discharge port through which the granulated sintering raw material is discharged, the drum having a cylindrical drum that rotates with a rotation axis in the horizontal direction, and within the drum, Blowing steam into the sintering raw material from a position 500 mm or more away from the deposition surface of the sintering raw material in the first half between the input port and the intermediate position between the input port and the discharge port. A method for producing a granulated sintered raw material that has a temperature higher than that of a granulated sintered raw material that is 10°C or more higher than that of a granulated sintered raw material that is granulated without heating.
[5] The production of the granulated sintering raw material according to [4], wherein of the total amount of steam blown into the sintering raw material, half or more of the steam is blown in such a manner that the jetting direction is directed toward the discharge port side. Method.
[6] Sintering of producing sintered ore by sintering the granulated sintered raw material granulated using the method for producing the granulated sintered raw material described in [4] or [5] in a sintering machine. Method for producing concretions.

By using the granulation apparatus according to the present invention, steam can be blown into the sintering raw material to efficiently heat it, so the steam consumption rate of the steam used during granulation can be reduced. By using this heated granulated and sintered raw material, the permeability of the charging layer is improved and the production rate of sintered ore is improved. It is possible to improve the production rate and suppress the increase in the manufacturing cost of sintered ore.

FIG. 1 is a schematic diagram showing an example of a sintered ore production facility 10 having a drum mixer 32, which is a granulation device according to the present embodiment. FIG. 2 is a graph showing the relationship between the temperature of the sintered raw material at the exit side of the drum mixer and the air permeability index JPU of the charging layer. FIG. 3 is a graph showing the relationship between the temperature of the sintered raw material at the exit side of the drum mixer and the air permeability index JPU of the charging layer. FIG. 4 is a schematic diagram illustrating the configuration of the drum mixer. FIG. 5 is a cross-sectional view of the drum mixer showing the positions of a plurality of nozzles. FIG. 6 is a graph showing the results of the steam blowing experiment. FIG. 7 is a schematic diagram showing steam piping. FIG. 8 is a graph showing the results of the steam blowing experiment.

Hereinafter, the present invention will be explained through embodiments of the invention. FIG. 1 is a schematic diagram showing an example of a sintered ore production facility 10 having a drum mixer 32, which is a granulation device according to the present embodiment. The iron-containing raw material 12 stored in the yard 11 is transported to a mixing tank 22 by a transport conveyor 14. The iron-containing raw material 12 includes various brands of iron ore and dust generated within a steel mill.

The raw material supply section 20 includes a plurality of

blending tanks

22, 24, 25, 26, and 28. The iron-containing raw material 12 is stored in the blending tank 22 . The blending tank 24 stores a CaO-containing raw material 16 containing limestone, quicklime, etc., and the blending tank 25 stores an MgO-containing raw material 17 including dolomite, refined nickel slag, etc. The blending tank 26 stores a coagulating material 18 containing coke powder and anthracite that have been crushed to a particle size of 1 mm or less using a rod mill. The blending tank 28 stores return ore (sintered ore undersieve powder) with a particle size of 5 mm or less, which is the undersieve of the sintered ore. A predetermined amount of each raw material is cut out from the blending tanks 22 to 28 of the raw material supply section 20, and these are blended to form a sintering raw material. The sintering raw material is conveyed to a drum mixer 32 by a conveyor 30. The MgO-containing raw material 17 is an optionally blended raw material, and may or may not be blended with the sintering raw material.

The drum mixer 32 is a granulation device that granulates the sintered raw material while blowing steam onto it. The drum mixer 32 includes a cylindrical drum 33 that rotates with the horizontal direction as an axis of rotation, a steam pipe 36, and a plurality of nozzles 37 that are connected to the steam pipe 36 and eject steam 38 onto the surface on which the sintering raw material is deposited. have Note that water vapor is an example of steam.

The cylindrical drum 33 has an input port 34 provided on one end surface of the drum 33 for introducing the sintering raw material, and an input port 34 provided on the other end surface of the drum 33 for receiving the granulated sintering material. (hereinafter referred to as pseudo particles) is provided with a discharge port 35 through which the particles are discharged. The steam pipe 36 is provided in a region within the drum 33 that is the first half between the input port 34 and an intermediate position between the input port 34 and the discharge port 35 . The plurality of nozzles 37 are provided at positions 500 mm or more away from the sintering raw material deposition surface in the vertical direction, and blow water vapor from the positions toward the sintering raw material deposition surface.

In this way, by producing pseudo-particles by granulating the sintered raw material while blowing in water vapor, the average particle size at a temperature of 10°C or more higher than that of pseudo-particles granulated without blowing in water vapor is approximately 3.0 mm. It is granulated into pseudo particles. The pseudo particles are transported to a sintering machine 40 by a transport conveyor 39. In this embodiment, the average particle size of the pseudo particles is the arithmetic mean particle size, Σ(Vi×di) (where Vi is the abundance ratio of particles in the i-th particle size range, and di is the i It is the particle size defined by the representative particle size of the particle size range. Further, the drum mixer 32 is an example of a granulating device that granulates the sintering raw material.

The sintering machine 40 is, for example, a downward suction type Dwight Lloyd type sintering machine. The sintering machine 40 includes a sintering raw material supply device 42, an endlessly movable pallet truck 44, an ignition furnace 46, and a wind box 48. The sintering raw material is charged from the sintering raw material supply device 42 to the pallet truck 44, and a charged layer of the sintering raw material is formed. The charge layer is ignited in an ignition furnace 46. By suctioning air through the wind box 48, the coagulated material 18 is combusted within the charge layer, and the combustion/melting zone within the charge layer is moved below the charge layer. This causes the charging layer to sinter and form a sintered cake. In this embodiment, a gaseous fuel supply device 47 may be provided. The gaseous fuel supplied from the gaseous fuel supply device 47 includes blast furnace gas, coke oven gas, blast furnace/coke oven mixed gas, converter gas, city gas, natural gas, methane gas, ethane gas, propane gas, shale gas, and mixtures thereof. Any combustible gas selected from gases.

The sintered cake is crushed into sintered ore by a crusher 50. The sintered ore crushed by the crusher 50 is cooled by a cooler 52. The sintered ore cooled by the cooler 52 is sieved by a sieving device 54 having a plurality of sieves, and is separated into finished sintered ore 56 with a particle size of more than 5 mm and return ore 58 with a particle size of 5 mm or less. be done. The finished sintered ore 56 is used as a blast furnace raw material. On the other hand, the return ore 58 is conveyed to the blending tank 28 of the raw material supply section 20 by a conveyor 60. In this embodiment, the particle size of the finished sintered ore 56 and the particle size of the return ore 58 mean the particle size that can be sieved by a sieve. This is the particle size that is sieved on the sieve, and the particle size of 5 mm or less is the particle size that is sieved under the sieve using a sieve with an opening of 5 mm. The grain size values of the finished sintered ore 56 and the return ore 58 are just examples, and are not limited to these values.

In this way, in the production of sintered ore using the sintered ore production equipment 10, the drum mixer 32 blows steam into the sintered raw material to granulate and heat the sintered raw material. This improves the air permeability of the charging layer of the sintering raw material and improves the production rate of the sintering raw material. FIG. 2 is a graph showing the relationship between the temperature of the pseudo particles at the exit side of the drum mixer and the air permeability index JPU of the charging layer. The horizontal axis in FIG. 2 is the temperature (° C.) of the pseudo particles discharged from the drum mixer 32. The temperature of the pseudo particles is the average temperature of the pseudo particles discharged from the drum mixer 32.

The temperature of the sintered raw material before being introduced into the drum mixer 32 is 35.0°C. The sintering raw material includes a CaO-containing raw material. Since CaO generates heat when reacting with water to generate Ca(OH) ₂ , the temperature of the sintering raw material rises from 35.0° C. to about 42.5° C. even without blowing water vapor into it. In Figure 2, the plot where the horizontal axis is 42.5°C is an example of granulation in which the sintered raw material is granulated without blowing steam into the sintered raw material, and the other plots are granulated by blowing steam into the sintered raw material. This is an example of granulation in which the sintered raw material is heated.

The vertical axis in FIG. 2 is the air permeability index JPU of the charging layer. JPU is an air permeability index measured by coldly drawing atmospheric air downward through a charged layer formed by charging pseudo particles into a pallet. The air permeability index JPU is calculated using the following formula (1).

JPU=V/[S×(ΔP/h) ^0.6 ]...(1)
In the above equation (1), V is the air volume (m ³ /min), S is the effective area of the sintering machine (m ² ), h is the charging layer height (mm), and ΔP is the pressure loss ( _mmH2O ).

If the air permeability of the charged layer is high, the air permeability index JPU will be large, and if the air permeability is low, the air permeability index JPU will be small. As shown in FIG. 2, the air permeability of the charged layer was improved by blowing steam into the sintering raw material and raising the temperature of the pseudo particles higher than 42.5°C. In addition, the air permeability of the charge layer formed by pseudo particles at 47.0 °C, which is raised by 10 °C or more from 42.5 °C, is significantly higher than gender. From this result, it is preferable to granulate the sintering raw material by blowing water vapor into it to produce pseudoparticles with a temperature 10°C or more higher than pseudoparticles granulated without blowing water vapor into the material. It can be seen that pseudo particles are formed with interlayers.

FIG. 3 is a graph showing the relationship between the temperature of the pseudo particles at the exit side of the drum mixer and the production rate of sintered ore. The horizontal axis in FIG. 3 is the temperature (° C.) of the pseudo particles discharged from the drum mixer 32. The vertical axis of FIG. 3 is the production rate (t/(hr×m ² )) of sintered ore. As shown in Figure 3, the production rate of sinter produced using pseudo particles at 56.0°C, which is 10°C higher than 43.5°C, is The production rate was significantly higher than that of sinter produced using particles. From this result and the results shown in Figure 2, we found that the sintering raw material was granulated by blowing water vapor into it to create pseudo particles whose temperature was 10°C or more higher than that of pseudo particles granulated without blowing water vapor, and the pseudo particles were sintered using the pseudo particles. It can be seen that the production rate of sintered ore can be improved by producing concretions.

Next, the configuration of the drum mixer 32 that can efficiently raise the temperature of the pseudo particles discharged from the drum mixer 32 by blowing in the steam of the sintering raw material will be described. Since the drum 33 rotates with the horizontal direction as the axis of rotation, the position at which the sintering raw material is deposited in the drum 33 is inclined in the rotation direction of the drum 33 with respect to the vertically downward direction. The plurality of nozzles 37 are provided at positions separated from the deposition surface of the sintering raw material by 500 mm or more in the vertical direction. In this manner, by providing the plurality of nozzles 37 at positions separated by 500 mm or more in the vertical direction from the deposition surface of the sintering raw material, the temperature of the pseudo particles can be efficiently raised. The rotation axis of the drum mixer 32 may be substantially horizontal. Further, in order to efficiently discharge the pseudo particles, the rotation axis may be tilted so that the discharge port 35 is located vertically below the input port 34.

FIG. 4 is a schematic diagram illustrating the configuration of the drum mixer 32. FIG. 4(a) is a schematic cross-sectional view of the drum mixer 32. FIG. 4(b) is a schematic diagram of the steam piping 36. In FIG. 4B, the plurality of nozzles 37 are indicated by arrows indicating the direction of water vapor ejected from each nozzle.

As shown in FIG. 4, in the drum mixer 32 according to the present embodiment, the steam pipe 36 is connected to a first half of the input port 34 from the input port 34 of the drum 33 to an intermediate position between the input port 34 and the discharge port 35. It is provided at a position up to 5000 mm from the mouth 34. Further, the steam pipe 36 is provided with 15 nozzles 37 at a pitch of 350 mm. Among these plurality of nozzles 37, the first to seventh nozzles from the input port 34 side are provided so as to eject water vapor perpendicularly to the deposition surface of the sintering raw material. The 8th to 14th nozzles from the input port 34 side are provided so as to face the discharge port 35 side, and are inclined at 30 degrees toward the discharge port 35 side with respect to the perpendicular to the deposition surface of the sintering raw material. The nozzle closest to the discharge port 35 side is provided at an angle of 45° toward the discharge port 35 with respect to the perpendicular to the deposition surface of the sintering raw material. That is, among the plurality of nozzles 37, more than half of the nozzles are installed at an angle so that the steam jet direction faces the discharge port 35 side, and the steam jet direction of the remaining nozzles is perpendicular to the deposition surface of the sintering raw material. It is installed so that steam can be blown out.

FIG. 5 is a cross-sectional view of the drum mixer showing the positions of multiple nozzles. In order to confirm the effect of the nozzle installation position, the drum mixer shown in FIG. A drum mixer equipped with steam piping was manufactured, and a steam injection experiment was conducted using the drum mixer.

FIG. 6 is a graph showing the results of the steam blowing experiment. The horizontal axis in FIG. 6 is the position (m) in the drum mixer, and the vertical axis is the temperature (° C.) of the sintering raw material. In FIG. 6, the temperature of the sintered raw material is the average temperature of the sintered raw material at each position within the drum mixer shown on the horizontal axis. The conditions for this experiment (steam injection experiment) were as follows: In all experimental examples (1 to 5), the steam injection amount was 7.5 t/h, the steam temperature was 170°C (steam piping pressure: 0.7 MPa), The experiment was conducted with a raw material (sintering raw material) input amount of 730 t/h.

As shown in Figure 6, in the drum mixers of Experimental Examples 1 and 2 in which the vertical distance from the sintering raw material deposition surface was less than 500 mm, the temperature near the input port increased, but the temperature subsequently decreased. As a result, the temperature of the pseudo particles discharged from these drum mixers became lower. On the other hand, in the drum mixers of Experimental Examples 3, 4, and 5, in which the vertical distance from the sintering raw material deposition surface was 500 mm or more, although the temperature near the input port was low, the subsequent temperature drop was suppressed, and these drums The temperature of the pseudo particles discharged from the mixer was higher than in Experimental Examples 1 and 2. Based on these results, we found that by installing multiple nozzles at positions 500 mm or more vertically away from the sintering raw material deposition surface and blowing water vapor into the sintering raw material from the nozzles, the sintering raw material could be vertically It was confirmed that the temperature of the pseudo particles discharged from the drum mixer was higher than when a plurality of nozzles were provided at positions less than 500 mm apart. In this way, in the drum mixer according to this embodiment, the temperature of the pseudo particles can be efficiently increased by blowing steam, so if the amount of steam blown is the same, the temperature of the pseudo particles discharged from the drum mixer can be increased. It can be seen that if the temperature of the pseudo particles discharged from the drum mixer is the same, the amount of water vapor blown can be reduced.

On the other hand, the moisture content of the pseudo particles discharged from the drum mixer is also important. When the water content of the pseudo particles discharged from the drum mixer becomes less than the target water content (6.5% by mass), granulation of the sintering raw material does not proceed, and the particle size of the pseudo particles after granulation becomes small. When the particle size of the pseudo-particles becomes small in this way, the permeability of the charging layer formed by the pseudo-particles with the small particle size deteriorates, and the production rate of sintered ore decreases.

FIG. 7 is a schematic diagram showing steam piping. In FIG. 7 as well, a plurality of nozzles are indicated by arrows indicating the direction of water vapor ejected from each nozzle. FIG. 7A shows the steam piping of Experimental Example 11 in which a plurality of nozzles were provided so that the direction of the ejected water vapor was vertically downward. In FIG. 7(b), among a plurality of nozzles, the 1st to 7th nozzles from the input port side are installed so that the direction of water vapor ejected is vertically downward, and the 8th to 14th nozzles from the input port side are The jetting direction of the water vapor spouted from the nozzle is inclined at 30 degrees toward the exhaust port with respect to the vertically downward direction, and the jetting direction of the steam spouting from the nozzle closest to the discharge port side is set to the vertically downward direction toward the discharge port. This is the steam piping of Experimental Example 12, which was installed at an angle of 45 degrees to the side. In Fig. 7(c), the jetting direction of water vapor ejected from the first to seventh nozzles from the input port side is inclined by 30 degrees toward the discharge port side with respect to the vertical downward direction. The direction of water vapor ejected from the 8th to 14th nozzles from the mouth side is inclined at 45 degrees toward the outlet side with respect to the vertical downward direction, and the direction of the water vapor ejected from the nozzle closest to the outlet side. is the steam piping of Experimental Example 13, which was provided at an angle of 60° toward the discharge port with respect to the vertically downward direction. A steam injection experiment was conducted using a drum mixer in which these steam pipes were installed so that steam was blown in from a position 1500 mm away from the deposition surface of the sintering raw material in the vertical direction.

FIG. 8 is a graph showing the results of the steam blowing experiment. The horizontal axis in Figure 8 is the position (m) in the drum mixer, the vertical axis is the moisture content (mass%) of the sintered raw material, and the average of the sintered raw material at each position in the drum mixer shown on the horizontal axis. Indicates moisture content.

As shown in FIG. 8, the water content of the pseudo particles granulated with the drum mixer equipped with steam piping of Experimental Examples 12 and 13 is lower than that of the pseudo particles granulated with the drum mixer equipped with the steam piping of Experimental Example 11. The water content was higher than that of the pseudo particles. From these results, it can be seen that it is preferable that the nozzle be provided with a larger inclination so that as the position of the nozzle approaches the outlet, the direction of the ejected water vapor is directed more toward the outlet. In addition, since the moisture content of the pseudo particles was higher in Experimental Example 13 than in Experimental Example 12, we installed the nozzles at an angle so that the steam jet direction of more than half of the nozzles faced the exhaust port. It can be seen that it is preferable that all the nozzles are provided at an angle so that the steam jetting direction of the nozzle faces the discharge port side. Note that since the amount of steam blown from each nozzle is the same, the steam should be blown into the sintering raw material by tilting the nozzle so that more than half of the total amount of steam blown is directed toward the discharge port. is preferable, and it is more preferable to blow the water vapor into the sintering raw material by tilting so that all the water vapor jets are directed toward the discharge port.

As described above, the drum mixer 32, which is the granulation device according to the present embodiment, can blow steam into the sintering raw material and heat it efficiently. Therefore, if the amount of steam used is the same, the pseudo particles can be heated to a higher temperature, and if the temperature on the outlet side is the same, the pseudo particles can be heated with a smaller amount of steam used. As described above, by using the granulation device according to the present embodiment, it is possible to reduce the amount of steam used during the production of sintered ore while heating the sintered raw material to a predetermined temperature, thereby improving the production rate of the sintered ore. It is possible to suppress an increase in the manufacturing cost of sintered ore.

10 Sintered ore production equipment 11 Yard 12 Iron-containing raw material 14 Conveyor 16 CaO-containing raw material 17 MgO-containing raw material 18 Coagulating material 20 Raw material supply section 22 Blending tank 24 Blending tank 26 Blending tank 28 Blending tank 30 Conveyor 32 Drum mixer 33 Drum 34 Input port 35 Discharge port 36 Steam pipe 37 Nozzle 38 Steam 39 Conveyor 40 Sintering machine 42 Sintering raw material supply device 44 Pallet truck 46 Ignition furnace 48 Wind box 50 Crusher 52 Cooler 54 Sieving device 56 Finished sintered ore 58 Return ore 60 Conveyor 62 Sintering raw material

Claims

A granulation device for granulating a sintering raw material containing an iron-containing raw material, a CaO-containing raw material, and a coagulating material,
a cylindrical drum that is provided with an inlet into which the sintering raw material is input and an outlet through which the granulated sintering raw material is discharged, and which rotates with a horizontal direction as an axis of rotation;
a steam pipe provided only in the first half of the drum between the input port and an intermediate position between the input port and the discharge port;
a plurality of nozzles that are connected to the steam piping and eject steam onto the deposition surface of the sintering raw material;
The plurality of nozzles are provided at a distance of 500 mm or more from a deposition surface of the sintering raw material.
Among the plurality of nozzles, more than half of the nozzles are installed so that the steam jet direction is inclined toward the discharge port, and the steam jet direction of the remaining nozzles is perpendicular to the deposition surface of the sintering raw material. The granulation device according to claim 1, wherein the granulation device is installed so as to eject the granulation device.
The granulation device according to claim 1 or 2, wherein the steam ejection direction of the plurality of nozzles is tilted so that the position of the nozzle increases toward the discharge port as the position of the nozzle approaches the discharge port.
A method for producing a granulated sintered raw material, comprising granulating a sintered raw material containing an iron-containing raw material, a CaO-containing raw material, and a coagulating material using a granulating device, the method comprising:
The granulation device has a cylindrical drum that is provided with an input port into which the sintering raw material is input, and a discharge port through which the granulated sintering raw material is discharged, and which rotates with a horizontal direction as an axis of rotation. death,
Steam is applied to the sintering raw material from a position 500 mm or more away from the deposition surface of the sintering raw material in the first half of the drum between the input port and the intermediate position between the input port and the discharge port. A method for producing a granulated sintered raw material by blowing the steam into the granulated sintered raw material to obtain a granulated sintered raw material that is 10° C. or more higher than a granulated sintered raw material that is granulated without blowing the steam.
The method for producing a granulated sintered raw material according to claim 4, wherein of the total amount of steam blown into the sintered raw material, half or more of the steam is blown in such a manner that the jetting direction of the steam is angled toward the discharge port.
A sintered ore produced by sintering a granulated sintered raw material granulated using the method for producing a granulated sintered raw material according to claim 4 or 5 in a sintering machine. Production method.