JP2022182572A - Manufacturing method of sintered ore - Google Patents

Abstract

To provide a manufacturing method of a sintered ore capable of preventing uneven burning of a sintered ore and capable of improving strength and yield of the sintered ore.SOLUTION: A method for manufacturing sintered ore, comprising a step of depositing a sintering raw material on a pallet of a sintering machine from a feeder having a sub-gate to form a raw material charging layer; a step of inserting an aeration rod into the raw material charging layer from an upper surface of the raw material charging layer; a step of measuring a height of the upper surface of the raw material charging layer to measure a raw material layer thickness distribution in a horizontal width direction perpendicular to an advancing direction of the raw material charging layer; a step of leveling the upper surface of the raw material charging layer; a step of sintering the sintering raw material by igniting the surface of the leveled raw material charging layer; and a step of blowing oxygen-rich air from above into the raw material charging layer after ignition, in which in the cross section of the raw material fired in the ore discharge section of the sintering machine, at least two of the opening of the sub-gate, the depth of insertion of the ventilation rod, and an oxygen concentration of the oxygen-enriched air in a horizontal width direction are adjusted to make the height of a red heat part from a pallet bottom surface even.SELECTED DRAWING: Figure 2

Description

The present invention relates to a method for producing sintered ore that can obtain sintered ore with good properties by controlling the charging state of sintering raw materials used in a sintering machine that produces sintered ore from iron ore. .

FIG. 1 is a diagram for explaining an example of a conventionally known sintering machine targeted by the method for producing sintered ore according to the present invention. In general, sintered ore used as a main raw material in the blast furnace ironmaking process is produced through the steps shown in FIG. The manufacturing method will be briefly described below according to the illustrated flow.

As shown in FIG. 1, iron ore powder with an average particle size of about 1.0 to 5.0 mm, recovered powder in steel works, sintered ore under-sieving powder, CaO-containing raw materials (CaO-based auxiliary raw materials) such as limestone and dolomite, quicklime First, sintering raw materials including granulation aids such as coke powder and coagulants such as anthracite are stored in hoppers 1, respectively. Then, these raw materials are cut out from the hopper 1 containing them in a predetermined ratio onto a conveyor, mixed by a drum mixer 2 for mixing and granulating, moisture is adjusted by adding an appropriate amount of water, and granulated. granulated particles (pseudo-particles) having an average diameter of 3.0 to 6.0 mm. Next, the granulated particles are fed from a surge hopper 4 placed on the sintering machine through a drum feeder 5 and a cutting chute 6 onto an endless movable sintering machine pallet 7 to form a raw material layer of about 400 to 600 mm. A raw material charging layer 8 is formed by charging so as to have a thickness (height). Next, the coagulant on the upper surface of the raw material charging layer 8 is ignited by the ignition furnace 9 installed above the raw material charging layer 8 . Then, by sucking air from the wind box 10 arranged under the sintering machine pallet 7, the coagulant (internal coagulant) in the granulated particles in the raw material loading layer 8 is sequentially removed from the upper layer to the lower layer. By burning and heating and melting the granulated sintering raw material with the combustion heat generated at this time, the raw materials are bonded together to form a sintered ore. The sintered layer (sintered cake) fired on the sintering machine pallet is conveyed to the next process through the ore discharge section 11 located behind the sintering machine, crushed and sized to 5.0 mm The above is collected as product sintered ore. In addition, 3 is a bedding hopper, and 17 is a cut-off gate.

Here, the thickness of the raw material charging layer 8 is greatly related to the air permeability of the raw material charging layer (sintering bed) at the time of sintering. . For this reason, a larger amount of air flows in the portion where the thickness of the raw material layer is smaller than in other portions. That is, the firing air volume is increased. Since a large amount of oxygen is supplied to such a portion where the firing air volume is large, the burning of the coagulant is accelerated, the burning rate increases, and the firing progresses quickly.

If there is a portion in which the amount of sintering air is excessively large in the raw material charging layer 8, only the combustion zone progresses rapidly without being able to sufficiently maintain the high temperature state due to the combustion of the cohesive in that portion, resulting in the structure after sintering. becomes brittle and the yield of the product decreases. Furthermore, if the sintering air volume increases, the sintering itself will not propagate, and an unsintered area will remain in the sintering bed, resulting in a decrease in productivity. Note that the combustion zone is a portion of the raw material charging layer 8 after ignition where the coagulant is burning. Since the cohesive material in the raw material charging layer 8 is burned sequentially from the upper layer to the lower layer, the combustion zone also moves from the upper layer to the lower layer as the firing progresses.

If the firing rate varies in the horizontal width direction (hereinafter referred to as the "width direction") perpendicular to the advancing direction of the raw material layer 8 due to variations in the thickness of the raw material layer, the operating operation is based on the portion with the slowest firing speed. In order to consider the completion of sintering, reduce the sintering machine pallet speed to reduce the production rate, or discharge a part of the ore from the sintering machine pallet without sintering to increase the sintered ore powder. In any case, the production rate has to be reduced. The firing rate is obtained by dividing the raw material layer thickness by the time from when the coagulant on the upper surface of the raw material charging layer 8 is ignited until the combustion zone reaches the lowest end of the raw material charging layer 8 .

Therefore, in order to improve the product yield, reduce the amount of sintered ore sieved, and reduce the coagulant unit consumption, it is desirable to keep the firing rate constant in the width direction. For this purpose, it is necessary to accurately grasp the raw material layer thickness distribution in the width direction of the raw material charging layer 8 on the sintering machine pallet so that the raw material layer thickness distribution is constant in the width direction.

As a technique for measuring the raw material layer thickness of the raw material charging layer 8 on the sintering machine pallet, conventionally, a plurality of level gauges were installed in the width direction on the raw material feed side and the ore discharge side, and the level gauges at each position in the width direction were measured. The raw material layer thickness in the part and the ore discharge part were measured, and the contraction rate of the sintered ore was calculated from the difference. A technique is disclosed in which the raw material charging density of an ore part is obtained and the opening degree of a subgate is adjusted so as to achieve this raw material charging density (see, for example, Patent Document 1).

JP-A-5-5589

However, in the sintering raw material layer thickness level control method for a sintering machine described in Patent Document 1, the charging density is controlled by the gate opening of the sub-gate, but the number of divisions of the sub-gate is limited. Therefore, there is an unsolved problem that it is difficult to adjust the firing air volume in a range narrower than the width of each subgate.

An object of the present invention is to propose a method for producing sintered ore that can prevent uneven burning of sintered ore and improve the strength and yield of sintered ore.

In the course of research to solve the problems of the above-mentioned conventional technology and to achieve the above-mentioned purpose, the inventors found that a plurality of level gauges were installed in the width direction on the raw material feeding side, and After measuring the raw material layer thickness of the feeding part, the firing air volume for each width direction is adjusted by adjusting at least two conditions among the opening degree of the subgate, the depth of the aeration rod insertion, and the oxygen concentration in the width direction. As a result, the height of the red-hot part from the bottom of the pallet becomes uniform in the cross section of the raw material fired in the ore discharge section of the sintering machine, resulting in unevenness. It was found that burning can be prevented and the strength and yield of sintered ore can be improved.

That is, the present invention is a sintered ore production method for obtaining sintered ore by sintering sintered raw material charged on a pallet of a sintering machine, wherein the sintered raw material is sub-gated to the pallet of the sintering machine. forming a raw material charging layer by depositing from a feeder having a measuring the raw material layer thickness distribution in the horizontal width direction perpendicular to the advancing direction of the raw material charged layer; leveling the upper surface of the raw material charged layer; A step of sintering the sintering raw material by ignition, and a step of blowing high oxygen concentration air from above into the raw material charging layer after ignition, and in a cross section of the raw material fired in the ore discharge section of the sintering machine , so that the height of the red-hot portion from the bottom of the pallet is uniform, at least two of the degree of opening of the subgate, the depth of insertion of the ventilation rod, and the oxygen concentration of the oxygen-rich air in the horizontal width direction A method for producing sintered ore, characterized by adjusting two.

In addition, in the method for producing sintered ore according to the present invention configured as described above,
(1) When adjusting the opening degree of the sub-gate and the depth of insertion of the ventilation rod, after confirming the deviation of the firing air volume for each width direction of the sintering machine after adjusting the opening degree of the sub-gate, try to compensate for the remaining deviation. In addition, adjusting the depth of insertion of the ventilation rod in the width direction of the sintering machine so that the firing air volume is constant in the width direction,
(2) When adjusting the sub-gate opening and the oxygen concentration in the width direction, after confirming the deviation of the firing air volume for each sintering machine width direction after adjusting the sub-gate opening, compensate for the remaining deviation. , using an oxygen blower to adjust the oxygen concentration in the width direction of the sintering machine so that the sintering air volume is constant in the width direction;
(3) When adjusting the penetration depth of the ventilation rod and the oxygen concentration in the width direction, after the raw material is discharged from the drum feeder, the raw material layer thickness level sensor is used before the cutoff gate. Measure the raw material layer thickness of the raw material charging layer for each width direction, check the deviation of the raw material layer thickness from the target value, and sinter for each width direction of the sintering machine caused by the remaining raw material layer thickness deviation in the width direction Calculate the air volume, adjust the insertion depth of the ventilation rod in the width direction of the sintering machine so as to compensate for the deviation of the air volume in the sintering machine width direction, and make the air volume in the sintering machine constant in the width direction. If it is not possible to adjust the rod insertion depth, adjust the oxygen concentration in the width direction of the sintering machine using an oxygen blower so as to compensate for the remaining deviation, and make the firing air volume constant in the width direction. to make
is considered to be a more preferable solution.

According to the present invention, in the cross section of the raw material fired in the ore discharge section of the sintering machine, the subgate opening degree, the depth of the aeration rod insertion, and the By adjusting at least two or more conditions among the oxygen concentrations, the width direction firing rate can be accurately controlled to an appropriate state, and high-strength and high-quality sintered ore can be produced at a high yield. can.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating an example of the conventional sintering machine for which the manufacturing method of the sintered ore which concerns on this invention is object. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating one Embodiment of the sintering raw material charging part in the sintering machine which enforces the manufacturing method of the sintered ore which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure for demonstrating one Embodiment of the thickness detection apparatus of the raw material charging layer in the sintering machine which enforces the manufacturing method of the sintered ore which concerns on this invention. It is a graph for demonstrating the relationship between the amount of air in the manufacturing method of the sintered ore which concerns on this invention, and the ventilation-bar depth. It is a graph for demonstrating the relationship between the air|gas volume and oxygen concentration in the manufacturing method of the sintered ore which concerns on this invention. It is a figure for demonstrating one Embodiment of the red-hot part in the manufacturing method of the sintered ore which concerns on this invention.

EMBODIMENT OF THE INVENTION Hereinafter, one Embodiment of the manufacturing method of the sintered ore which concerns on this invention is described, referring drawings.

FIG. 2 is a diagram for explaining an embodiment of a sintering raw material charging section in a sintering machine for carrying out the method for producing sintered ore according to the present invention. In the example shown in FIG. 2, the same members as those of the sintering machine shown in FIG. In the example shown in FIG. 2, the sintering material 20 is conveyed on the pallet 7 in the conveying direction 13 (direction of arrow 13 in the figure). A direction perpendicular to the conveying direction 13 is defined as a horizontal width direction 14 of the sintering machine (direction of arrow 14 in the figure). The raw material cut out from the surge hopper 4 is diffused and charged onto the pallet 7 of the sintering machine by the drum feeder 5 . At the charging portion of the drum feeder 5, sub-gates 15 are arranged at equal intervals in the width direction of the sintering machine, and each gate opening is adjusted by a command from a control device (arithmetic device) (not shown). By doing so, it is possible to increase/decrease the cut amount of the sintering raw material 20 at the corresponding portion.

A discharge portion of the drum feeder 5 is provided with a plurality of ventilation rods 16 arranged in the width direction of the sintering machine. By piercing the surface of the charged sintering raw material 20 with the aeration rod 16, a low-density region can be formed, and the burning speed of the pierced portion can be increased. There is generally a correlation between the depth of insertion of the aeration rod 16 and the air volume for firing, as shown in FIG. The depth of insertion into the surface of the raw material 20 for sintering can be adjusted by each aeration rod 16 .

A cut-off gate 17 is arranged on the side of the drum feeder 5 in the conveying direction 13 . This cut-off gate 17 is a so-called leveling plate, and is arranged across the width of the sintering machine so as to be positioned at the upper end of the raw material charging layer 8 . The cutoff gate 17 can be vertically adjusted in the height direction from the bottom surface of the sintering pallet 7, and compacts the excessive portion in the raw material layer thickness direction of the sintering raw material 20 of the sintering machine. The thickness of the raw material layer is made uniform by making the thickness of the raw material layer uniform. Although the layer thickness of the raw material charging layer 8 after leveling by the cut-off gate 17 is constant, the cut-off gate 17 is leveled by a method of consolidating the sintering raw material 20 . Therefore, if the thickness of the raw material charging layer 8 before leveling by the cut-off gate 17 varies in the width direction, the sintering raw material 20 after leveling has a porosity variation in the width direction. Since the sintering air volume varies depending on the porosity of the sintering raw material 20, if the thickness of the raw material charging layer 8 before being leveled by the cutoff gate 17 varies in the width direction, the sintering air volume deviation in the width direction Occur.

An ignition furnace 9 for igniting the raw material 20 for sintering is provided on the output side of the cut-off gate 17 . The sintering process is started by igniting the surface of the sintering raw material 20 in the ignition furnace 9 and sucking it from the air box 10 arranged below the pallet 7 with a main exhaust fan (not shown).

The oxygen blowing device 18 is provided on the delivery side of the ignition furnace 9 . The oxygen blowing device 18 is a step of blowing high-oxygen-concentrated air into the raw material charging layer 8 of the sintering raw material 20 to increase the burning speed of the blown portion. The oxygen blowing device 18 is divided into chambers along the width direction of the sintering machine, and the flow rate of oxygen-rich air blown onto the surface of the raw material loading layer 8 can be adjusted in each chamber. There is generally a correlation between the oxygen concentration and the firing air volume, as shown in FIG.

In the embodiment shown in FIG. 2, six raw material layer thickness level sensors 19 are arranged at regular intervals on the entry side of the cutoff gate 17 as the raw material layer thickness detection device. The raw material layer thickness level sensor 19 detects the height of the raw material charging layer 8 of the sintering raw material 20 on the pallet 7 before ignition and suction start, and detects the height of the raw material charging layer 8 of the sintering raw material 20. It is detected as a layer thickness level. As shown in FIG. 3, the raw material layer thickness detection device consists of a laser rangefinder arranged at a predetermined height on the pallet 7 of the sintering machine at predetermined intervals in the width direction of the pallet 7 of the sintering machine. A raw material layer thickness level sensor 19 irradiates a laser beam 21 vertically downward from the raw material layer thickness level sensor 19, and from the intensity of the reflected laser beam 21, the raw material charged on the pallet 7 of the sintering machine is detected. It is an apparatus for continuously measuring the raw material layer thickness of the layer 8 .

Further, in this embodiment, a camera (not shown) is installed in the ore discharge unit 11 of the sintering machine shown in FIG. is filming. FIG. 6 shows an image of a cross section of the fired raw material photographed with a camera. In the cross section of the firing raw material 20, a sintered cake portion 22 that has been fired to a low temperature and a red-hot portion 23 that has been fired but still looks red at a temperature of 900° C. to 1300° C. can be confirmed. As shown in FIG. 6, in the cross section of the sintered raw material, the positions of points p1 to p10 are determined at equal intervals in the width direction of the sintering machine. heights d1 to d10 of are measured respectively. If the average value of the measured heights d1 to d10 is D, points smaller than D have a faster burning speed than the average in the width direction, and points larger than D have a burning speed relative to the average in the width direction. is slow. The object of the present invention can be achieved by reducing the standard deviation σd of the heights d1 to d10 here, that is, by making the heights d1 to d10 uniform.

Using a Dwight Lloyd sintering machine with a daily scale of 8000 tons having the same configuration as the example shown in FIG. , have practiced the present invention. Eighteen ventilation rods 16 were installed at equal intervals in the width direction so that the depth of each of the ventilation rods 16 into the raw material loading layer 8 could be independently controlled. The oxygen blowing device 18 is configured so that the oxygen concentration can be controlled in the width direction of the sintering machine by adjusting the flow rate of oxygen blown from the oxygen blowing port extending in the width direction of the sintering machine.

In the sintering machine described above, the target thickness of the raw material layer 8 was set at 630 mm, and the raw material for sintering was discharged from the drum feeder 5 . Using the raw material layer thickness level sensor 19, the raw material layer thickness of the raw material charging layer 8 was measured for each width direction of the sintering machine before the cut-off gate 17. As a result, the raw material charging layer 8 The thickness of the raw material layer fluctuated. The deviation of each material layer thickness in the width direction with respect to the target layer thickness was obtained, and the sub-gate opening degree was adjusted using the sub-gate 15 divided into six parts so as to reduce the deviation. The opening of the subgate was adjusted by rotating the rotary handle on the side of the gate. When the layer thickness of the raw material charging layer 8 in the division range of the sub-gate 15 is smaller than the target value of 630 mm, the gate is opened, and when the layer thickness of the raw material charging layer 8 is larger than the target value of 630 mm, the gate is closed. In addition, the opening degree of the subgate 15 was adjusted.

The raw material layer thickness of the raw material charging layer 8 remaining in the width direction after the adjustment of the sub-gate opening degree was measured using the raw material layer thickness level sensor 19 . The porosity of the raw material charging layer 8 after being flattened by the cut-off gate 17 caused by the remaining thickness deviation of the raw material layer in the width direction was calculated. The porosity was calculated from the thickness change of the raw material charging layer 8 before and after leveling with the cut-off gate 17 . At this time, the charging density before leveling by the cut-off gate 17 was made constant in the width direction of the sintering machine. From the porosity of the raw material charging layer 8 in the width direction of the sintering machine after leveling with the cut-off gate 17, the suction differential pressure from below the pallet, and the raw material layer thickness calculated as described above, the Ergun formula was used to calculate the sintering air volume for each width direction of the sintering machine. As a result, the sintering air volume for each width direction of the sintering machine after adjusting the subgate opening was calculated. At this stage, since the adjustment of the sub-gate opening degree is limited to six divisions, there remains a portion that cannot be adjusted within a range smaller than the number of divisions.

<When adjusting the opening of the sub-gate and the depth of the ventilation rod>
In this case, after confirming the deviation of the firing air volume in the width direction of the sintering machine after adjusting the opening degree of the subgate, the insertion depth of the ventilation rod 16 in the width direction of the sintering machine is adjusted so as to compensate for the remaining deviation, The firing air volume was made constant in the width direction. The aeration rod 16 was fixed to the pedestal of the corridor deck above the sintering machine, and was configured to be inserted from the pedestal toward the raw material charging layer 8 in the vertical downward direction. The insertion depth of the aeration rod 16 was adjusted by loosening the bolt of the base and adjusting the depth of insertion of the aeration rod 16 into the raw material loading layer 8 . When increasing the firing air volume, the depth of insertion of the aeration rod was increased, and when decreasing the firing air volume, the depth of insertion of the aeration rod was decreased. The amount of piercing of the aeration rod 16 was determined from the correlation between the depth of piercing of the aeration rod and the amount of firing air in the actual machine shown in FIG.

<When adjusting the sub-gate opening and the oxygen concentration in the width direction>
In this case, after confirming the deviation of the sintering air volume in each width direction of the sintering machine after adjusting the opening degree of the sub-gate, the oxygen blowing device 18 was adjusted so as to compensate for the remaining deviation. An oxygen blowing device 18 was used to adjust the oxygen concentration in the width direction of the sintering machine so that the sintering air volume was constant in the width direction. In the oxygen blowing device 18, the oxygen concentration was controlled in the width direction of the sintering machine by adjusting the flow rate of oxygen blown from the oxygen blowing port extending in the width direction of the sintering machine. If it is desired to increase the firing air volume, the oxygen blowing volume at that point is increased to relatively increase the oxygen concentration. When the firing air volume is reduced, the oxygen concentration is relatively lowered without blowing oxygen at that point. At that time, the relationship between the oxygen concentration and the firing air volume used the correlation in the actual machine shown in FIG.

<When adjusting the penetration depth of the ventilation rod and the oxygen concentration in the width direction>
In this case, after the raw material is discharged from the drum feeder 5, the raw material layer thickness level sensor 19 is used to measure the raw material layer thickness of the raw material charging layer 8 for each width direction of the sintering machine before the cut-off gate 17. and confirmed the deviation of the raw material layer thickness from the target value of 630 mm. The sintering air volume for each width direction of the sintering machine, which is caused by the residual raw material layer thickness deviation in the width direction, was calculated by the same method as described above. In order to compensate for the deviation of the firing air volume in the width direction of the sintering machine, the insertion depth of the vent rod 16 was adjusted in the width direction of the sintering machine so that the firing air volume was constant in the width direction. The amount of piercing of the aeration rod 16 was determined from the correlation between the depth of piercing of the aeration rod and the amount of firing air in the actual machine shown in FIG. However, the vent rod 16 cannot be inserted beyond the raw material layer thickness of the raw material loading layer 8 on the sintering machine pallet 7 . Therefore, if the thickness of the raw material layer is t, the adjustment range of the insertion depth of the aeration rod is 0 mm to t mm. If the deviation of the sintering air volume in the width direction of the sintering machine could not be adjusted by adjusting the insertion depth of the aeration rod 16 within this range, the oxygen blowing device 18 was further adjusted. The oxygen blowing device 18 was used to adjust the oxygen concentration in the width direction of the sintering machine, and the firing air volume was made constant in the width direction. At that time, the relationship between the oxygen concentration and the firing air volume used the correlation in the actual machine shown in FIG.

<When performing adjustment using all of the sub-gate opening, the depth of insertion of the ventilation rod, and the oxygen concentration in the width direction>
It is also possible to make adjustments using all of the subgate opening, the penetration depth of the ventilation rod, and the oxygen concentration in the width direction. In this case, each factor was manipulated so that the sintering air volume in the width direction of the sintering machine was finally constant.

In the above procedure, as a comparative example, A: when not adjusted, B: when only the sub-gate opening is adjusted, C: when only the insertion depth of the aeration rod is adjusted, and D: when only the oxygen concentration in the width direction is adjusted. As an example of the present invention, E: when adjusting the sub-gate opening and the depth of insertion of the aeration rod, F: when adjusting the opening of the sub-gate and the oxygen concentration in the width direction, and G: adjusting the depth of the aeration rod and the oxygen concentration in the width direction. Time, H: 4 patterns when adjusting the oxygen concentration in the subgate opening degree, the insertion depth of the aeration rod, and the width direction, for a total of 8 patterns. A photograph was taken, and the height d1 to d10 of the red-hot portion 23 from the bottom surface of the pallet 7 and the standard deviation σd of d1 to d10 were obtained. Moreover, the shutter strength of the sintered ore and the yield of the sintered ore were measured. The shutter strength of the sintered ore was determined according to JIS M 8711. The yield of the sintered ore was calculated from "the weight on the sieve/the weight of the base material" when the sintered ore after the ore discharge was sieved through a sieve mesh with a sieve mesh of 5×15 mm. The results are shown in Table 1 below.

The results in Table 1 reveal the following.

First, B: σd when only the sub-gate opening was adjusted was smaller than A: σd when not adjusted. there was a spot

In addition, C: σd when only the depth of insertion of the aeration rod was adjusted and D: σd when only the oxygen concentration in the width direction was adjusted were both smaller than σd when A: was not adjusted, but the aeration rod was inserted. Since there is an adjustment upper limit for both the oxygen concentration in the depth and the width direction, there were some places that could not be adjusted.

Furthermore, E: σd when adjusting the subgate opening and the depth of insertion of the aeration rod, F: σd when adjusting the opening of the subgate and the oxygen concentration in the width direction, G: The depth of insertion of the aeration rod and the oxygen concentration in the width direction B: σd when only the subgate opening is adjusted, C: σd when only the depth of the aeration rod is adjusted, and D: σd when only the oxygen concentration in the width direction is adjusted. It was small, and the shutter strength of the sintered ore and the yield of the sintered ore were improved.

Furthermore, H: σd when adjusting the sub-gate opening, the depth of insertion of the aeration rod, and the oxygen concentration in the width direction, E: σd when adjusting the opening of the sub-gate and the depth of insertion of the aeration rod, σd when adjusting the oxygen concentration in the width direction, G: It was about the same as σd when the oxygen concentration was adjusted in the width direction and the penetration depth of the aeration rod.

From the above results, by adjusting at least two conditions among the subgate opening degree, the depth of the aeration rod insertion, and the oxygen concentration in the width direction, the firing air volume in each width direction can be uniformed, and the firing speed can be uniformed. As a result, in the cross section of the raw material fired in the sintering machine discharge part, the height of the red-hot part from the bottom of the pallet becomes uniform, preventing uneven burning and sintering It was found that the strength and yield of ore can be improved.

The method for producing sintered ore according to the present invention is used for sintering raw materials obtained from various formulations, especially when aiming to prevent uneven burning of sintered ore and to improve the strength and yield of sintered ore. Suitable application is possible.

1 Hopper 2 Drum Mixer 3 Bedding 4 Surge Hopper 5 Drum Feeder 6 Cutting Chute 7 Pallet 8 Raw Material Charging Layer 9 Ignition Furnace 10 Wind Box 11 Ore Discharge Section 13 Conveying Direction 14 Width Direction 16 Vent Bar 15 Subgate 17 Cutoff Gate 18 Oxygen blowing device 19 Laser rangefinder 20 Sintering raw material 21 Laser light 22 Sintered cake part 23 Red-hot part

Claims (4)

A sintered ore manufacturing method for obtaining sintered ore by sintering sintering raw materials charged on a pallet of a sintering machine,
A step of depositing a sintering raw material on a pallet of a sintering machine from a feeder having a subgate to form a raw material charging layer, a step of inserting a vent rod into the raw material charging layer from the upper surface of the raw material charging layer, A step of measuring the height of the upper surface of the raw material charging layer to measure the raw material layer thickness distribution in the horizontal width direction perpendicular to the traveling direction of the raw material charging layer, and a step of leveling the upper surface of the raw material charging layer. and a step of sintering the sintering raw material by igniting the surface of the flattened raw material charging layer, and a step of blowing oxygen-rich air from above into the raw material charging layer after ignition,
In the cross section of the raw material fired in the ore discharge section of the sintering machine, the opening degree of the subgate, the insertion depth of the ventilation rod, and the horizontal width are adjusted so that the height of the red-hot portion from the bottom surface of the pallet is uniform. A method for producing sintered ore, characterized by adjusting at least two of: the oxygen concentration of oxygen-enriched air in a direction. When adjusting the opening degree of the sub-gate and the depth of insertion of the ventilation rod, after confirming the deviation of the firing air volume for each width direction of the sintering machine after adjusting the opening degree of the sub-gate, sintering is performed so as to compensate for the remaining deviation. 2. The method for producing sintered ore according to claim 1, wherein the depth of insertion of the aeration rod is adjusted in the width direction of the machine so that the amount of sintering air is constant in the width direction. When adjusting the sub-gate opening and the oxygen concentration in the width direction, after confirming the deviation of the sintering air volume for each width direction of the sintering machine after adjusting the sub-gate opening, oxygen blowing is performed so as to compensate for the remaining deviation. 2. The method for producing a sintered ore according to claim 1, wherein the oxygen concentration in the width direction of the sintering machine is adjusted using a loading device to make the firing air volume constant in the width direction. When adjusting the penetration depth of the aeration rod and the oxygen concentration in the width direction, after the raw material is discharged from the drum feeder, the raw material layer thickness level sensor is used before the cutoff gate in the width direction of the sintering machine. Measure the raw material layer thickness of each raw material charging layer, check the deviation of the raw material layer thickness from the target value, and calculate the sintering air volume for each width direction of the sintering machine caused by the remaining raw material layer thickness deviation in the width direction. Then, in order to compensate for the deviation of the firing air volume in the width direction of the sintering machine, the depth of insertion of the ventilation rod in the width direction of the sintering machine is adjusted so that the firing air volume is constant in the width direction, and the ventilation rod is inserted. If the depth cannot be adjusted, adjust the oxygen concentration in the width direction of the sintering machine using an oxygen blower so as to compensate for the remaining deviation, and make the firing air volume constant in the width direction. The method for producing sintered ore according to claim 1, characterized in that

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