Sintered ore manufacturing method and sintered ore manufacturing equipment

Abstract

To provide a method for manufacturing a sintered ore capable of obtaining a yield improvement effect of the sintered ore by using an air fuel supply device and an apparatus for manufacturing the sintered ore.SOLUTION: A method for manufacturing sintered ore comprises: a granulation step in which sintering raw materials including iron-containing raw materials, carbon-containing raw materials, and CaO-containing raw materials are granulated using a granulator to form granulated particles; a charging layer forming step of charging grain particles into an endless movable pallet with a raw material supply device of a sintering machine to form a charging layer; a sintering step for igniting the carbon-containing raw material contained in a surface layer of the charging layer in an ignition furnace provided on a downstream side of the raw material supply device, and supplying gaseous fuel to the charging layer from a gaseous fuel supply device provided on the downstream side of the ignition furnace, and sucking air in the charging layer with a wind box provided below the pallet to ignite the carbon-containing raw material to form the charged layer into a sintered cake; and a crushing step for crushing the sintered cake into a sintering ore, wherein in the charging layer forming step, the charging layer is formed such that dry standard charging density of the charging layer is 1.80 dry-ton / m3 or less.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method for producing sintered ore, which is a raw material for a blast furnace, and to a production facility for sintered ore. [Background technology]

[0002] Sintered ore, which is a raw material for blast furnaces, is generally produced using iron-containing raw materials such as iron ore powder, powder recovered in steelworks, and sintered ore undersize powder, CaO-containing raw materials such as limestone and dolomite, and carbonaceous materials (solid fuel) such as coke powder and anthracite as sintering raw materials, using a Dwight Lloyd sintering machine (hereinafter referred to as the "sintering machine"), which is an endless moving sintering machine.

[0003] The sintering raw materials are charged into the endless moving pallet of the sintering machine, and a charging layer of the sintering raw materials is formed. The thickness (height) of the charging layer is about 400 to 800 mm. Then, the carbonaceous material in the charging layer is ignited by an ignition furnace installed above the charging layer. The carbonaceous material in the charging layer is burned one by one by sucking air downward through a wind box installed under the pallet. This combustion progresses gradually downward and forward as the pallet moves. The combustion heat generated at this time burns and melts the sintering raw materials, and a sintered cake is produced. The obtained sintered cake is then crushed in the ore discharge section to become sintered ore.

[0004] In the above-mentioned sintering machine, it is important to improve the yield of sintered ore. As a technology for improving the strength and yield of sintered ore, Patent Document 1 discloses a sintering machine in which a gaseous fuel supply device is provided downstream of an ignition furnace and gaseous fuel is supplied from the upper side of the charging bed. According to Patent Document 1, the gaseous fuel is supplied into the charging bed by sucking air downward with a wind box, and the gaseous fuel is burned to increase not only the yield of sintered ore in the upper layer of the charging bed, where sintering is likely to be insufficient due to lack of heat, but also the yield of sintered ore in the middle and lower layers of the charging bed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2010-107154 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, there is a problem that the yield of sintered ore may not be improved even if the sintering machine disclosed in Patent Document 1 is used. The present invention aims to provide a method and equipment for producing sintered ore that can improve the yield of sintered ore by using a gas fuel supply device. [Means for solving the problem]

[0007] The means for solving the above problems are as follows. [1] A granulation step of granulating sintering raw materials including an iron-containing raw material, a carbon-containing raw material and a CaO-containing raw material in a granulator to form granulated particles; a charging bed formation step of charging the granulated particles on an endless moving pallet by a raw material supply device of the sintering machine to form a charging bed of the sintering raw materials; a sintering step of igniting the carbon-containing raw material contained in the surface layer of the charging bed in an ignition furnace provided downstream of the raw material supply device, supplying gaseous fuel to the charging bed from a gaseous fuel supply device provided downstream of the ignition furnace, and burning the carbon-containing raw material by sucking air in the charging bed in a wind box provided below the pallet to form the charging bed into a sintered cake; and a crushing step of crushing the sintered cake into sintered ore, wherein in the charging bed formation step, the dry basis charging density of the charging bed is 1.80 dry-ton / m 3 The method for producing sintered ore, wherein the sintering bed is formed so as to be as follows: [2] The method for producing sintered ore according to [1], further comprising a calculation step of calculating a dry basis charging density of the sintering bed. [3] The dry base charge density calculated in the calculation step is 1.80 dry-ton / m 3 The method for producing sintered ore described in [2], wherein when the charging density of the sintered ore is higher than the charging density of the sintered ore, the conditions of the sintered ore formation step are changed to reduce the charging density of the sintered ore formed. [4] The dry base charge density calculated in the calculation step is 1.80 dry-ton / m 3 The method for producing sintered ore according to [2] or [3], wherein when the temperature is higher than the temperature, conditions for the granulation step are changed to narrow a distribution width of a particle size distribution of the granulated particles. [5] The method for producing sintered ore according to [4], further comprising increasing the amount of CaO-containing raw material in the sintering raw material. [6] A granulator for granulating sintering raw materials including an iron-containing raw material, a carbon-containing raw material, and a CaO-containing raw material to form granulated particles, an endless moving pallet, a raw material supplying device for charging the granulated particles onto the pallet to form a sintering raw material charging layer, an ignition furnace for igniting the carbon-containing raw material contained in the surface layer of the sintering layer, a gas fuel supplying device provided downstream of the ignition furnace for supplying gas fuel to the sintering layer, and a wind box provided below the pallet for sucking air in the sintering layer. The sintering machine sinters the sintering layer to form a sintered cake, and a crusher for crushing the sintered cake to form sintered ore. The control device controls the operation of the granulator, the sintering machine, and the crusher, and the control device controls the operation of the granulator, the sintering machine, and the crusher, and the control device controls the operation of the granulator, the sintering machine, and the crusher, and the control device controls the operation of the granulator, the sintering machine, and the crusher, and the control device controls the operation of the sintering machine ... 3 The sintering machine is controlled so that: [7] The sintered ore manufacturing equipment described in [6], wherein the control device calculates the dry basis charging density of the charging bed. [8] The calculated dry standard charge density is 1.80 dry-ton / m 3 The sintered ore manufacturing equipment described in [7], wherein when the charging density of the sintering bed is higher than the charging density of the sintering bed, the control device changes the operating conditions of the sintering machine to reduce the charging density of the sintering bed. [9] The calculated dry standard charge density is 1.80 dry-ton / m 3 The sintered ore manufacturing equipment according to [7] or [8], wherein when the temperature is higher than the specified temperature, the control device changes the granulation conditions of the granulator to narrow the distribution width of the particle size distribution of the granulated particles. Effect of the Invention

[0008] By implementing the sintered ore manufacturing method of the present invention, a sintering bed with a charging density of 1.80 dry-ton / m3 or less is formed, so that the supply of gaseous fuel by the gaseous fuel supply device can have the effect of improving the yield of sintered ore. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing a sintered ore production facility in which the sintered ore production method according to the present embodiment can be carried out. [Diagram 2] FIG. 2 is a schematic cross-sectional view of a sintering test apparatus used in the sintering test. [Diagram 3] FIG. 3 is a graph showing the relationship between the dry basis charging density of the charging bed and the LNG yield improvement effect. [Figure 4] FIG. 4 is a schematic diagram showing the state of granulated particles in the sintering bed. [Diagram 5] FIG. 5 is a graph showing the relationship between the high temperature holding time of 1200° C. or higher and the effect of improving the LNG yield. [Figure 6] FIG. 6 is a graph showing the relationship between the dry basic charging density and the high temperature holding time at 1200° C. or higher. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, the present invention will be described through the embodiments of the present invention. Fig. 1 is a schematic diagram showing a sintered ore manufacturing facility in which the sintered ore manufacturing method according to the present embodiment can be implemented. The sintered ore manufacturing facility 10 includes a granulator 16, a sintering machine 20, a crusher 30, and a control device 40.

[0011] The granulator 16 granulates the sintering raw material 12, which contains the iron-containing raw material, the carbon-containing raw material, and the CaO-containing raw material, to form granulated particles 18. When the granulator 16 granulates the granulated particles 18, granulation water 14 is added to the sintering raw material 12. This process is the granulation step. The granulated particles 18 granulated by the granulator 16 are transported to the sintering machine 20. The iron-containing raw material is, for example, iron ore or dust generated in a steelworks. The carbon-containing raw material is, for example, coke powder or anthracite. The CaO-containing raw material is, for example, quicklime, limestone, or slag.

[0012] The sintering machine 20 is, for example, a Dwight Lloyd type sintering machine. The sintering machine 20 includes a raw material supplying device 21, a pallet 22, a cutoff plate 23, an ignition furnace 24, a gas fuel supplying device 25, and a wind box 26. The raw material supplying device 21 charges the granulated particles 18 into the pallet 22.

[0013] The pallet 22 is an endless movable pallet. When the granulated particles 18 are charged into the pallet 22 from the raw material supply device 21, a charging layer of the sintering raw material 12 is formed in the pallet 22. The cut-off plate 23 flattens the surface of the charging layer and adjusts the thickness of the charging layer to a preset target layer thickness. This process is the charging layer formation step.

[0014] The ignition furnace 24 is provided downstream of the raw material supply device 21 and ignites the carbon-containing raw material contained in the surface layer of the charging bed. The gaseous fuel supply device 25 supplies gaseous fuel to the surface side of the charging bed. For example, city gas (LNG) is supplied as the gaseous fuel. The gaseous fuel supplied from the gaseous fuel supply device 25 is not limited to city gas, and any combustible gas selected from blast furnace gas, coke oven gas, blast furnace-coke oven mixed gas, converter gas, natural gas, methane gas, ethane gas, propane gas, shale gas, and mixed gases thereof may be used.

[0015] The wind box 26 is provided below the pallet 22 and sucks the air in the sintering bed formed in the pallet 22 downward. When the air in the sintering bed is sucked downward by the wind box 26, the combustion and melting zone in the sintering bed moves below the sintering bed. In addition, as the air in the sintering bed is sucked downward, the gaseous fuel supplied from the gaseous fuel supply device 25 is introduced into the sintering bed from the surface layer. As the pallet 22 moves, the combustion and melting zone in the sintering bed moves downward, and the sintering raw materials 12 in the sintering bed are sintered. A sintered cake is obtained by sintering the sintering raw materials 12. This process is the sintering step.

[0016] The crusher 30 crushes the sintered cake discharged from the sintering machine 20 to produce crushed sintered cake. The crushed sintered cake is cooled and sized to produce sintered ore 32. This process is the crushing step.

[0017] The control device 40 is a general-purpose computer such as a workstation or a personal computer having a control unit 41 and a storage unit 42. The control unit 41 is, for example, a CPU or the like, and controls the operations of the granulator 16, the sintering machine 20, and the crusher 30 by executing a program read from the storage unit 42. The storage unit 42 is, for example, an updatable flash memory, a built-in hard disk or a hard disk connected via a data communication terminal, an information recording medium such as a memory card, and a read / write device for the information recording medium. The storage unit 42 stores programs for the control unit 41 to execute each function, data used by the programs, and the like.

[0018] The control unit 41 calculates the dry basis charging density of the charging layer formed in the pallet 22 of the sintering machine 20. The control unit 41 acquires wet basis raw material conveying speed data from the sintering machine 20, and calculates the dry basis raw material conveying speed by subtracting the moisture content of the sintering raw material measured in advance. Furthermore, the control unit 41 calculates the dry basis charging density by dividing the dry basis raw material conveying speed by the machine width of the sintering machine 20, the layer thickness of the charging layer, and the pallet speed. This process is the calculation step. The control unit 41 may display the calculated dry basis charging density.

[0019] The control unit 41 determines whether the calculated dry standard charging density is 1.80 dry-ton / m 3 When the dry standard charging density of the sintered bed is higher than 1.80 dry-ton / m, the granulation conditions of the granulator 16 and the operating conditions of the sintering machine 20 are changed to make the dry standard charging density of the sintered bed 1.80 dry-ton / m 3 Reduce the bed density so that it is as follows:

[0020] When changing the granulation conditions of the granulator 16, the control unit 41 changes the granulation conditions of the granulator 16 so that the distribution width of the particle size distribution of the granulated particles 18 becomes narrower. When the distribution width of the particle size distribution of the granulated particles 18 becomes narrower, the packing density of the granulated particles 18 charged to the pallet 22 becomes lower, so that the charging density of the charging bed decreases. The granulation conditions that narrow the distribution width of the particle size distribution of the granulated particles 18 can be obtained by performing a granulation experiment in which the rotation speed of the granulator 16, the amount of the sintering raw material 12 charged to the granulator 16, the amount of granulation water 14 added, etc. are changed, and the distribution width of the particle size distribution of the granulated particles 18 is confirmed.

[0021] Furthermore, the control unit 41 may increase the amount of CaO-containing raw material mixed into the sintering raw material 12. CaO functions as a binder, so that ungranulated powder that is difficult to granulate adheres to the granulated particles, thereby reducing fine particles in the particle size distribution. Therefore, when the amount of CaO-containing raw material is increased, the distribution width of the particle size distribution of the granulated particles 18 becomes narrower. Note that, in the manufacturing method of sintered ore according to this embodiment, an increase in the amount of CaO-containing raw material is also included in the change of the granulation conditions.

[0022] Furthermore, when changing the operating conditions of the sintering machine 20, the control unit 41 changes the opening of the charging gate of the raw material supply device 21 and the position of the cutoff plate 23. When changing the opening of the charging gate, the control unit 41 narrows the opening of the charging gate to reduce the amount of granulated particles 18 charged into the pallet 22. By reducing the amount of granulated particles 18 charged, the charging density of the charging bed decreases.

[0023] Furthermore, when changing the position of the cutoff plate 23, the control unit 41 raises the position of the cutoff plate 23 to reduce the charging density of the charging bed. The cutoff plate 23 pushes the granulated particles 18 downward to flatten the surface of the charging bed and adjust the thickness of the charging bed to a preset thickness. Therefore, by raising the position of the cutoff plate 23, the amount of the granulated particles 18 pushed downward decreases, and the charging density of the charging bed decreases.

[0024] Furthermore, in the case where the raw material supply device 21 has a magnetic brake, the control unit 41 may strengthen the magnetic brake to reduce the amount of the granulated particles 18 charged to the pallet 22. By reducing the amount of the granulated particles 18 charged, the charging density of the charging bed is reduced.

[0025] In this way, the control unit 41 changes the granulation conditions of the granulator 16 and the operating conditions of the sintering machine 20 to adjust the dry standard charging density to 1.80 dry-ton / m 3 The charging density of the sintered ore bed is reduced to the following value. This makes it possible to obtain the effect of improving the yield of sintered ore by supplying gas fuel.

[0026] Next, a sintering test will be described, which confirmed the relationship between the dry standard charging density of the sintering bed, the yield improvement effect by gas fuel supply, and the high temperature holding time of 1200°C or higher. Figure 2 is a cross-sectional schematic diagram of the sintering test equipment used in the sintering test. The sintering test equipment 50 is composed of an ignition hood 51, a sintering pot 52, and a wind box 53. The ignition hood 51 is provided with an ignition burner 54, which ignites the coke powder contained in the surface layer of the sintering bed 55 formed in the sintering pot 52.

[0027] The sintering pot 52 is a cylindrical container with a diameter of 300 mm and a height of 600 mm. Thermocouples 56 are provided in the upper, middle, and lower layers of the sintering pot 52 to measure the temperature at each position, and a grate bar 57 is provided at the lower end. Granulated particles of the sintering raw material were charged into the sintering pot 52 to form a charging layer 55 with a layer thickness of 600 mm. Granulated particles of the sintering raw material consisting of 89 mass% iron ore, 11 mass% lime, and 4.0 mass% powdered coke were used as the sintering raw material. A sintering test was performed in which the charging layer 55 of the sintering raw material was sintered by sucking with a negative pressure of 10 kPa from the wind box 53 and supplying air containing 0.4 volume% city gas (LNG) from the ignition hood 51 for about 1 / 3 of the entire sintering time from immediately after the ignition was completed. During the sintering test, the temperatures of the upper, middle, and lower layers of the charging layer 55 were measured using three thermocouples 56. When city gas was supplied, the amount of coke powder equivalent to the calorific value of the city gas was deducted from the sintering raw material. The yield was calculated by dropping the sintered sample from a height of 2 m four times, sieving the dropped sample through a sieve with 5 mm openings, and dividing the mass of the sample remaining on the sieve by the mass of the sintered sample.

[0028] FIG. 3 is a graph showing the relationship between the dry base charging density of the sintered bed and the LNG yield improvement effect. In FIG. 3, the horizontal axis is the dry base charging density (dry-ton / m 3 ), and the vertical axis is the LNG yield improvement effect (points). Here, the LNG yield improvement effect is the value obtained by subtracting the yield of sintered ore sintered without supplying city gas from the yield of sintered ore sintered with the supply of city gas. For example, if the sintered ore yield increases from 80.0% by mass to 81.7% by mass by supplying city gas, the LNG yield improvement effect is 1.7 points.

[0029] As shown in FIG. 3, the effect of improving the LNG yield decreased as the dry basis charging density of the charging bed 55 increased. In particular, when the dry basis charging density was 1.80 dry-ton / m 3From this result, it was confirmed that the yield improvement effect by supplying gas fuel decreases as the dry base charging density of the sintering bed increases. Also, from Figure 3, when the dry base charging density is set to 1.70 dry-ton / m 3 If the density is kept below 1.70ry-ton / m, the LNG yield will be improved. 3 It is preferable to set the dry standard charge density to 1.60 dry-ton / m or less. 3 The effect of improving LNG yield can be maximized if the dry standard charging density of the sintering bed is set at 1.60ry-ton / m or less. 3 It is more preferable to do the following:

[0030] FIG. 4 is a schematic diagram showing the state of granulated particles in a sintering bed. FIG. 4(a) is a diagram showing the state of granulated particles 18 in a sintering bed with a low charging density, and FIG. 4(b) is a diagram showing the state of granulated particles 18 in a sintering bed with a high charging density. Unlike solid fuels such as fine coke, gaseous fuels burn only in the gaps through which gas passes. When the charging density of the sintering bed is low, as shown in FIG. 4(a), the combustion space of the gaseous fuel is wide, and the local flow rate of the gaseous fuel in the combustion space is slow. On the other hand, when the charging density of the sintering bed is high, as shown in FIG. 4(b), the combustion space of the gaseous fuel is narrow, and the local flow rate of the gaseous fuel in the combustion space is fast.

[0031] That is, when the charging density of the charging bed is low, the combustion space of the gaseous fuel is wide and the local flow rate of the gaseous fuel is slow, so that the gaseous fuel can be sufficiently burned and the time for the combustion heat to be transferred to the granulated particles 18 can be secured relatively long. As a result, the combustion heat of the gaseous fuel is transferred to the granulated particles 18, and the high temperature holding time of 1200 ° C or more is extended, which is considered to have produced the effect of improving the yield of sintered ore. On the other hand, when the charging density of the charging bed is high, the combustion space of the gaseous fuel is narrow and the local flow rate of the gaseous fuel is fast, so that the gaseous fuel cannot be sufficiently burned and the time for the combustion heat to be transferred to the granulated particles cannot be secured. As a result, the combustion heat of the gaseous fuel cannot be transferred to the granulated particles 18, the high temperature holding time of 1200 ° C or more is not extended, and it is considered that the effect of improving the yield of sintered ore is difficult to be produced.

[0032] Figure 5 is a graph showing the relationship between high-temperature holding time of 1200°C or more and the effect of improving LNG yield. In Figure 5, the horizontal axis is Δ high-temperature holding time of 1200°C or more (sec), and the vertical axis is the effect of improving LNG yield (points). Here, Δ high-temperature holding time of 1200°C or more indicates the amount of change in high-temperature holding time of 1200°C or more, with "50" meaning that the high-temperature holding time of 1200°C or more has been extended by 50 seconds, and "-50" meaning that the high-temperature holding time of 1200°C or more has been shortened by 50 seconds.

[0033] As shown in Figure 5, the effect of improving LNG yield increased as the high temperature holding time above 1200°C increased. This result confirmed that the yield improvement effect of supplying gaseous fuel increases as the high temperature holding time above 1200°C increases.

[0034] FIG. 6 is a graph showing the relationship between the dry base charge density and the high-temperature holding time of 1200°C or higher. In FIG. 6, the horizontal axis is the dry base charge density (dry-ton / m 3 ) and the vertical axis is the high-temperature holding time (sec) above Δ1200°C.

[0035] As shown in Fig. 6, the dry standard charge density is 1.80 dry-ton / m 3When the temperature was higher than 1200℃, the high temperature holding time was hardly extended. On the other hand, when the dry standard charge density was 1.80dry-ton / m 3 It was confirmed that the high temperature holding time of 1200°C or more can be extended by supplying gas fuel if the temperature is below 1200°C. If the high temperature holding time of 1200°C or more can be extended, the strength of the sintered cake will improve, so the dry standard charging density of the sintered bed can be increased to 1.80 dry-ton / m 3 It can be seen that the yield of sintered ore can be improved by doing the following:

[0036] As described above, in the method for producing sintered ore according to the present embodiment, the dry standard charging density of the sintered ore bed is 1.80 dry-ton / m 3 Since the sintering bed is formed so that the yield improvement effect can be obtained by supplying the gaseous fuel, the sintering bed is formed so that the yield improvement effect can be obtained by supplying the gaseous fuel. In addition, in the sintering bed manufacturing method according to the present embodiment, the dry base charging density of the sintering bed is calculated. By calculating the dry base charging density of the sintering bed in this manner, it becomes possible to determine whether the yield improvement effect can be obtained by supplying the gaseous fuel. [Explanation of symbols]

[0037] 10. Sintered ore manufacturing facility 12 Sintering materials 14 Granulation water 16 Granulator 18 Granulated particles 20 Sintering machine 21 Raw material supply device 22 Palettes 23 Cut-off plate 24 Ignition Furnace 25 Gaseous fuel supply device 26 Wind Box 30 Crusher 32 Sinter 40 Control device 41 Control section 42 Storage section 50 Sintering test equipment 51 Ignition Hood 52 Sintering pot 53 Wind Box 54 Ignition burner 55 Charge layer 56 Thermocouple 57 Great Bar

Claims

1. A granulation step of granulating a sintering raw material including an iron-containing raw material, a carbon-containing raw material, and a CaO-containing raw material in a granulator to form granulated particles; A charging bed forming step of charging the granulated particles onto an endless moving pallet by a raw material supply device of the sintering machine to form a charging bed of the sintering raw material; a sintering step of igniting the carbon-containing raw material contained in the surface layer of the charging bed in an ignition furnace provided downstream of the raw material supply device, supplying gaseous fuel to the charging bed from a gaseous fuel supply device provided downstream of the ignition furnace, and burning the carbon-containing raw material by sucking air in the charging bed with a wind box provided below the pallet, thereby making the charging bed into a sintered cake; A crushing step of crushing the sintered cake into sintered ore; having In the sieving step, the dry basis sieving density of the sieving bed is 1.70 dry-ton / m ３ The method for producing sintered ore, wherein the sintering bed is formed so as to be as follows:

2. The method for producing sintered ore according to claim 1 , further comprising a calculation step of calculating a dry base charging density of the sintering bed.

3. The dry base charge density calculated in the calculation step is 1.70 dry-ton / m ３ If it is higher, The method for producing sintered ore according to claim 2 , further comprising changing conditions of the sintering bed forming step to reduce a charging density of the sintering bed to be formed.

4. The dry base charge density calculated in the calculation step is 1.70 dry-ton / m ３ If it is higher, The method for producing sintered ore according to claim 2 or 3, further comprising changing conditions in the granulation step to narrow a distribution width of particle size distribution of the granulated particles.

5. The method for producing sintered ore according to claim 4, further comprising increasing the amount of CaO-containing raw material in the sintering raw material.

6. a granulator for granulating a sintering raw material including an iron-containing raw material, a carbon-containing raw material, and a CaO-containing raw material into granulated particles; a sintering machine comprising: an endless movable pallet; a raw material supplying device for charging the granulated particles onto the pallet to form a charging layer of the sintering raw material; an ignition furnace for igniting the carbon-containing raw material contained in a surface layer of the charging layer; a gas fuel supplying device provided downstream of the ignition furnace for supplying gas fuel to the charging layer; and a wind box provided below the pallet for sucking air from within the charging layer, and for sintering the charging layer to form a sintered cake; A crusher for crushing the sintered cake into sintered ore; A control device for controlling the operation of the granulator, the sinterer, and the crusher; Equipped with The control device controls the dry base charging density of the suction bed to be 1.70 dry-ton / m ３ The sintering machine is controlled so that:

7. The sintered ore manufacturing facility according to claim 6 , wherein the control device calculates a dry base charging density of the sintering bed.

8. The calculated dry base charge density is 1.70 dry-ton / m ３ The sintered ore manufacturing facility according to claim 7 , wherein when the density is higher than the density of the sintered ore, the control device changes the operating conditions of the sintering machine to reduce the charging density of the sintering bed.

9. The calculated dry base charge density is 1.70 dry-ton / m ３ The facility for producing sintered ore according to claim 7 or 8, wherein when the temperature is higher than the temperature, the control device changes the granulation conditions of the granulator to narrow a distribution width of a particle size distribution of the granulated particles.

Images