JP2024029278A - Sintered ore manufacturing method and sintering machine - Google Patents

Abstract

[Problem] When producing sintered ore, accurately measure the progress of combustion of carbonaceous materials and melting of sintered raw materials in the charging layer, and measure the progress of combustion of carbonaceous materials and melting of sintered raw materials. Optimize as necessary. [Solution] In the method for producing sintered ore according to the present invention, a sintering raw material is charged into a circulating pallet 26 to form a charging layer, and an upper surface layer of the charging layer is formed using an ignition furnace 20. is ignited, air is sucked in from below the charging layer, and the carbonaceous material contained in the sintering raw material is burned to form a sintered cake.Then, the sintered cake is discharged from the ore discharge section and sintered. A method for producing sintered ore, the method comprising: measuring the amount of shrinkage or shrinkage speed of the charging layer after ignition, and adjusting the amount or speed of shrinkage of the charging layer to be within a predetermined range; Adjusting the initial packing density of the charge layer. [Selection diagram] Figure 1

Description

The present invention relates to a method for producing sintered ore, which is a raw material for a blast furnace, and a sintering machine 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. It is manufactured using a Dwight Lloyd sintering machine (hereinafter referred to as "sintering machine"), which is an endless moving sintering machine, using a solid fuel as a sintering raw material.

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 charged layer is approximately 400 to 800 mm. Thereafter, the charcoal material in this 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 downward 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 above-mentioned sintering machine, from the viewpoint of improving the strength and yield of sintered ore, it is important to understand and optimize the combustion of carbonaceous material in the charging layer and the progress of melting of the sintering raw material. For example, Patent Document 1 discloses a temperature measuring device that protrudes from the bottom surface of a pallet and includes two or more temperature measuring sections for the purpose of measuring the temperature and sintering rate within the charging layer.

Japanese Patent Application Publication No. 2010-243443

However, the above conventional technology has the following problems.

That is, in Patent Document 1, the temperature inside the charging layer is measured using a temperature measuring device, but for example, if there is excessive air flowing through local voids created within the charging layer or through the boundary between the charging layer and the pallet. Due to disturbance factors such as suction by the sintered material, the temperature within the charging layer decreases regardless of the progress of combustion of the carbonaceous material and melting of the sintering raw material. Therefore, the temperature within the charging layer does not necessarily reflect only the progress of combustion of carbonaceous materials and melting of sintering materials within the charging layer, but rather the progress of combustion of carbonaceous materials and melting of sintering materials. There was a problem that the error was too large to use as an index.

The present invention was made in view of these problems, and its purpose is to monitor the progress of combustion of carbonaceous material and melting of sintered raw materials in the charging layer when producing sintered ore. It is an object of the present invention to provide a method for manufacturing sintered ore and a sintering machine that can accurately measure the progress of combustion of carbonaceous materials and melting of sintering raw materials as necessary.

The gist of the present invention for solving the above problems is as follows.

[1] Sintering raw materials are charged into a circulating pallet to form a charging layer, the upper surface layer of the charging layer is ignited using an ignition furnace, and air is sucked from below the charging layer. A method for producing sintered ore, comprising: burning the carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore, the method comprising: A method of producing sintered ore, characterized in that the amount of shrinkage of the subsequent charging layer is measured, and the initial packing density of the charging layer is adjusted so that the amount of shrinkage of the charging layer is within a predetermined range. Production method.

[2] Sintering raw materials are charged into a circulating pallet to form a charging layer, the upper surface layer of the charging layer is ignited using an ignition furnace, and air is sucked from below the charging layer. A method for producing sintered ore, comprising: burning the carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore, the method comprising: A method of producing sintered ore characterized by measuring the shrinkage rate of the later charged layer and adjusting the initial packing density of the charged layer so that the shrinkage rate of the charged layer falls within a predetermined range. Production method.

[3] The baking method according to [1], wherein the measurement is performed at two or more locations in the width direction of the pallet, and the initial packing density of the charged layer is adjusted in the width direction of the pallet. Method for producing concretions.

[4] The baking method according to [2], wherein the measurement is performed at two or more locations in the width direction of the pallet, and the initial packing density of the charged layer is adjusted in the width direction of the pallet. Method for producing concretions.

[5] The method for producing sintered ore according to [1], wherein the measurement is performed at two or more locations in the direction of movement of the pallet.

[6] The method for producing sintered ore according to [2], wherein the measurement is performed at two or more locations in the direction of movement of the pallet.

[7] The method for producing sintered ore according to [3], wherein the measurement is performed at two or more locations in the direction of movement of the pallet.

[8] The method for producing sintered ore according to [4], wherein the measurement is performed at two or more locations in the direction of movement of the pallet.

[9] The method for producing sintered ore according to any one of [1] to [8], wherein the measurement includes measuring the height position of the upper surface of the charging layer.

[10] The method for producing sintered ore according to [9], wherein the measurement is performed without contacting the charging layer.

[11] A pallet that moves in circulation, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites carbon material in the surface layer of the charging layer, and The sintering machine has a wind box installed below to suck air from below the charging layer, and sinters the sintering raw material using combustion heat of carbonaceous material contained in the sintering raw material. , a function of having a position measuring device for measuring the amount of contraction of the charging layer after ignition, and adjusting the initial packing density of the charging layer so that the amount of contraction of the charging layer is within a predetermined range. A sintering machine characterized by having:

[12] A pallet that circulates, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites carbon material on the surface of the charging layer, and a The sintering machine has a wind box installed below to suck air from below the charging layer, and sinters the sintering raw material using combustion heat of carbonaceous material contained in the sintering raw material. , having a position measuring device for measuring the shrinkage speed of the charge layer after ignition, and a function of adjusting the initial packing density of the charge layer so that the shrinkage speed of the charge layer is within a predetermined range. A sintering machine characterized by having:

[13] The position measuring device has a function of measuring two or more locations in the width direction of the pallet and adjusting the initial packing density of the charging layer in the width direction of the pallet, [11] The sintering machine described in ].

[14] The position measuring device has a function of measuring two or more locations in the width direction of the pallet and adjusting the initial packing density of the charging layer in the width direction of the pallet, [12] The sintering machine described in ].

[15] The sintering machine according to [11], wherein the position measuring device measures two or more locations in the moving direction of the pallet.

[16] The sintering machine according to [12], wherein the position measuring device measures two or more locations in the moving direction of the pallet.

[17] The sintering machine according to [13], wherein the position measuring device measures two or more locations in the moving direction of the pallet.

[18] The sintering machine according to [14], wherein the position measuring device measures two or more locations in the moving direction of the pallet.

[19] The sintering machine according to any one of [11] to [18], wherein the position measuring device measures the height position of the upper surface of the charged layer.

[20] The sintering machine according to [19], wherein the position measuring device measures without contacting the charging layer.

According to the present invention, since the shrinkage amount or shrinkage rate of the sintering raw material charging layer during sintering is measured, the combustion of carbonaceous material in the charging layer and the progress of melting of the sintering raw material can be accurately measured. The progress of combustion of the carbonaceous material and melting of the sintering raw material can be optimized as necessary.

FIG. 1 is a schematic side view showing an example of a sintering machine used when carrying out the method for producing sintered ore according to the present invention. FIG. 2 is a schematic perspective view of the sintering machine shown in FIG. 1. FIG. FIG. 3 is a diagram showing the results of investigating the behavior of the amount of shrinkage of the charging layer during sintering by changing the initial packing density of the charging layer. It is a figure which shows the result of investigating the shrinkage amount of the charge layer during sintering by changing the initial packing density of the charge layer. It is a figure which shows the result of investigating the yield of sintered ore after sintering by changing the initial packing density of a charge layer. It is a figure which shows the result of investigating sintering time by changing the initial packing density of a charge layer. FIG. 2 is a diagram showing the results of investigating the production efficiency of a sintering machine by changing the initial packing density of the charging layer. It is a figure which shows the result of investigating TI intensity|strength by changing the initial packing density of a charge layer. It is a figure which shows the result of investigating the shrinkage amount of the charge layer during sintering by changing the initial packing density of the charge layer.

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic side view showing an example of a sintering machine 10 used when carrying out the method for manufacturing sintered ore according to the present invention. Further, FIG. 2 is a schematic perspective view of the sintering machine 10 shown in FIG. 1.

Sintered raw materials include 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 carbonaceous materials (solid fuels) such as coke powder and anthracite. The ore is cut out by the roll feeder 14 from the surge hopper 12 provided in the feed section 40 of the sintering machine 10, and charged into the endless movable pallet 26 that circulates while guided by the slope of the charging chute 15. A charging layer of sintering raw material is formed inside the sintering material 26 . At this time, the thickness (height) of the charging layer is controlled by adjusting the opening degree of a plurality of dividing gates 16 installed at the bottom of the surge hopper 12 along the width direction of the pallet 26.

In this embodiment, the divided gate 16 is divided into eight parts, for example, as shown in FIG. 2, and each divided gate 16 is associated with a gate number (1 ~8) have been allocated. Furthermore, eight magnetic brakes 17 are provided at positions corresponding to the divided gates 16 of the charging chute 15, respectively. The magnetic brake 17 acts on the magnetic ore contained in the sintering raw material, and reduces the charging speed of the sintering raw material.

The charge layer formed on the pallet 26 moves toward the downstream side of the sintering machine 10 together with the pallet 26. A level meter 18 is provided downstream of the dividing gate 16. Eight level meters 18 are provided, the same number as the number of divisions of the division gates 16, and one level meter 18 is provided on the downstream side of each division gate 16. Each level meter 18 is assigned the same number as the division gate number, and each level meter 18 measures the thickness of the charged layer of the division gate 16 assigned the same number. In this embodiment, an ultrasonic level meter is used as the level meter 18.

Each level meter 18 measures the thickness of the charged layer and outputs the measured thickness data to the control device 32. Based on the input thickness data, the control device 32 adjusts the thickness of each dividing gate 16 so that the thickness of the charged layer is equal in the width direction of the pallet 26 or has a specified thickness. Control opening degree.

The upper surface layer of the charging layer is ignited by the ignition furnace 20 installed downstream of the ore feeding section 40. Furthermore, air is sucked by the blower 24, and air in the charging layer is sucked downward through the wind boxes 22 provided in plurality in the longitudinal direction below the pallet 26, and air is introduced into the charging layer from above. The carbonaceous material contained in the sintering raw material is burned. By adjusting the rotational speed of the blower 24, the amount of air sucked can be adjusted.

The sintered raw material is sintered and hardened by the combustion heat generated by burning the carbonaceous material, and becomes a sintered cake, which is a lump of sintered ore. The sintered cake is discharged from the ore discharge section 42. The sintered cake discharged from the ore discharge section 42 cracks in the width direction of the pallet 26 and breaks immediately before falling from the pallet 26. A red zone 38 appears on the fractured surface of the sintered cake left on the pallet 26. The ore discharge section camera 30 images the red zone 38 appearing on the fracture surface of the sintered cake, and outputs the photographed image data to the control device 32. The control device 32 controls the rotation speed of a drive device (not shown) for moving the pallet 26 according to the input thickness data of the red zone 38, adjusts the moving speed of the pallet 26, and moves the red zone 38. Adjust the thickness to an appropriate range.

Thereafter, the sintered cake falls from the ore discharge section 42, is crushed, cooled in a cooler (not shown), and sized to form a sintered product consisting of agglomerates with a particle size of more than 5.0 mm. It becomes a mine.

The control device 32 includes a storage section 34 and a control section 36. The control device 32 is, for example, a general-purpose computer such as a workstation or a personal computer. The storage unit 34 is, for example, an information recording medium that can be updated and recorded, such as a flash memory, a built-in hard disk or a hard disk connected via a data communication terminal, and a memory card, and a read/write device thereof. The storage unit 34 stores in advance a program necessary for implementing the method for manufacturing sintered ore according to the present embodiment, data used during execution of the program, and the like. The control unit 36 is, for example, a CPU, and controls the operation of the sintering machine 10 using programs and data stored in the storage unit 34.

In the charging layer after ignition, the temperature rise and melting of the sintering raw material due to combustion of the carbonaceous material progresses from the upper surface to the lower surface of the charging layer. It is known that the charging layer shrinks during this sintering process. Although the shrinkage progresses in all directions, most of the shrinkage is observed as a decrease in the height of the top surface of the charge layer due to the influence of the charge layer's own weight.

The present inventors measured the height position of the top surface of the charged layer while changing the sintering conditions, observed the shrinkage behavior, and obtained the following findings.

(1) The shrinkage rate of the charged layer due to sintering increases depending on the amount of carbon material blended, and the amount of carbon material blended is appropriate (4.0 to 4.4 mass%) at which the sintering reaction proceeds in just the right amount. ) reaches 10-20%. When the blending ratio of carbonaceous material was increased by 1% by mass in the vicinity of the appropriate blending ratio of carbonaceous material, the increase in the shrinkage rate of the charging layer was 7% or more, which was a change of more than 7 times the blending ratio of carbonaceous material. From this, it can be seen that the contribution of volume reduction due to burning of the carbon material itself to the shrinkage of the charging layer is small, and that the sintered layer melts and fills the voids, which makes a large contribution. It is thought that the shrinkage accurately reflects the progress of sintering. Adjustment of the amount of carbon material blended is performed by charging the sintering raw material whose blending amount of carbon material has been adjusted to a predetermined value into the surge hopper 12, and charging the sintering raw material into the pallet 26.

(2) If the initial packing density of the charging layer (packing density when the charging layer is formed) is larger than the appropriate value (1.70 to 1.90 ton/m ³ ), the charging layer will start shrinking from ignition. The amount of time it takes to reach this point is longer, and the amount of final shrinkage of the charge layer is smaller. Note that the initial packing density (ton/m ³ ) of the charging layer is the value obtained by dividing the weight (wet-ton) in a state containing water by its volume (m ³ ).

Figure 3 shows that the initial depth of the charge layer is 600 mm, and the initial packing density of the charge layer is varied in the range of 1.76 to 2.07 ton/ ^m3 to determine the amount of shrinkage of the charge layer during sintering. The results of a behavioral investigation are shown. As shown in Fig. 3, when the initial packing density of the charging layer is 1.76 to 1.89 ton/ ^m3 , the charging layer shrinks 5 minutes after ignition. When the initial packing density of the charged bed was 1.98 to 2.07 ton/m ³ , no significant shrinkage of the charged bed occurred even 20 minutes after ignition. Further, when the initial packing density of the charging layer was 1.98 to 2.07 ton/m ³ , the final amount of shrinkage was small. The initial packing density of the charging bed was adjusted by changing the particle size structure of the sintered raw material.

(3) The larger the initial packing density of the charging layer, the smaller the amount of shrinkage of the charging layer.If the initial packing density of the charging layer is 2.0 ton/ ^m3 or more, the shrinkage of the charging layer is small and may approach zero.

FIG. 4 shows the results of investigating the amount of shrinkage of the charging layer during sintering by setting the initial depth of the charging layer to 600 mm and varying the initial packing density of the charging layer. As shown in FIG. 4, the amount of shrinkage of the charging layer decreased as the initial packing density of the charging layer increased.

(4) The yield of product sintered ore (grain size 5.0 mm or more) is almost constant when the initial packing density of the charging layer is less than 1.9 ton/ ^m3 ; At 2.0 ton/m ³ or more, it decreases slightly.

Figure 5 shows the results of investigating the yield of product sintered ore (particle size of 5.0 mm or more) after sintering by setting the initial depth of the charging layer to 600 mm and varying the initial packing density of the charging layer. . As shown in Figure 5, the initial packing density of the charging layer has little effect on the yield of the product sintered ore, but the yield of the product sintered ore tends to decrease as the initial packing density of the charging layer increases. was there.

(5) If the initial packing density of the charging layer is large, the sintering time will be extended. As a result, when the initial packing density of the charged layer increases, the production efficiency of the sintering machine (production efficiency per sintering machine area: ton/(hr×m ² )) decreases.

FIG. 6 shows the results of investigating the sintering time by setting the initial depth of the charging layer to 600 mm and varying the initial packing density of the charging layer. Further, FIG. 7 shows the results of investigating the production efficiency of the sintering machine by setting the initial depth of the charging layer to 600 mm and varying the initial packing density of the charging layer. As shown in FIG. 6, the sintering time increased as the initial packing density of the charging layer increased. Moreover, as shown in FIG. 7, the production efficiency of the sintering machine decreased as the initial packing density of the charging layer increased.

(6) When the initial packing density of the charging layer is less than 2.0 ton/m ³ , the TI strength is almost constant, but when it is 2.0 ton/m ³ or more, the TI strength decreases.

FIG. 8 shows the results of investigating the TI strength by setting the initial depth of the charging layer to 600 mm and changing the initial packing density of the charging layer. As shown in FIG. 8, when the initial packing density of the charged layer was 2.0 ton/m ³ or more, the TI strength decreased. Here, TI strength is a rotational strength index of sintered ore measured in accordance with JIS M 8712. The measurement of TI intensity is performed by the following steps (i) and (ii).

(i) Using a rotating drum (inner diameter 1000 mm, inner diameter 500 mm), a 15 kg measurement sample is rotated a total of 200 times at a speed of 25 revolutions/minute ± 1 revolution/minute.

(ii) The measurement sample after rotation is sieved through a sieve with an opening of 6.3 mm, and the mass fraction (mass %) is calculated.

From the above findings, if the initial packing density of the charging layer is larger than the appropriate range, the production efficiency of the sintering machine 10 will be significantly reduced, and improvements in the yield and TI strength of the product sintered ore cannot be expected. Understood.

Therefore, it can be seen that if the initial packing density of the charging layer is so excessively large as to cause a decrease in production efficiency, it is necessary to reduce the initial packing density of the charging layer to an appropriate value. However, conventionally, it has been extremely difficult to quickly determine during the sintering process whether the initial packing density of the charging layer is appropriate.

Therefore, the inventors of the present invention have intensively investigated means for quickly determining whether or not the initial packing density of the charging layer is appropriate during the sintering process. As a result, they found that it is possible to estimate whether the initial packing density of the charged layer is appropriate by measuring the amount or rate of shrinkage of the charged layer during sintering.

The present inventors determined that, in a pallet 26 in which the width of the charging layer is 800 mm and the initial depth of the charging layer is 400 mm, the initial packing density of the charging layer on the left side from the center of the pallet 26 is 1.76 ton/m. ³ (appropriate packing density) and the initial packing density of the charging layer on the right side from the center is 1.98 ton/m ³ (excess packing density) (solid line), and the charging layer of the entire width direction of the pallet 26. The amount of shrinkage of the charged layer during sintering was investigated when the initial packing density was set to 1.76 ton/m ³ (appropriate) (dashed line). Figure 9 shows the survey results.

As shown in FIG. 9, when the initial packing density of the charging layer is 1.98 ton/m ³ , the initial packing density of the charging layer is 1.76 ton/m ³ during sintering. The amount of shrinkage of the charging layer has decreased. Therefore, it has been found that it is possible to estimate whether the initial packing density of the charged layer is appropriate by measuring the amount or rate of shrinkage of the charged layer during sintering. In other words, it has been found that by adjusting the initial packing density of the charged layer based on the measurement results of the shrinkage behavior of the charged layer during sintering, it is possible to suppress a decrease in the production efficiency of the sintering machine.

The present invention has been made based on the above findings, and the sintering machine 10 according to the present invention is provided with a position measuring device 28 for measuring the shrinkage amount and shrinkage speed of the charged layer during sintering. . The position measuring device 28 is provided on the downstream side of the ignition furnace 20, and the position measuring device 28 measures the height position of the upper surface layer of the charging layer coming out of the ignition furnace 20, and the measured height position data is output to the control device 32. The control unit 36 of the control device 32 calculates the shrinkage amount and shrinkage speed of the charged layer based on the input height position data.

<Measurement mechanism of position measuring device 28>
Since the object to be measured by the position measuring device 28 is the outer surface of the charging layer, the temperature is lower than the inside of the charging layer, which reaches 1200° C. or higher. Therefore, it is also possible to measure the height position of the upper surface of the charged layer using a contact type weight or a roller with an arm as the position measuring device 28. However, from the viewpoint of durability, it is preferable that the position measuring device 28 is a non-contact type position measuring device such as an ultrasonic distance meter.

From the viewpoints of wide measurement field of view and measurement depth, high position resolution, large number of measurement points, and high measurement speed, the position measurement device 28 is a non-contact optical position measurement device such as a laser scanner. It is more preferable that An example of a laser scanner is the 3D scanner ScanStation P series manufactured by Leica, but many of them achieve high-speed scanning through minute movements of galvano mirrors that reflect the laser, and are installed directly above the charging layer. If you try to measure vertically downward, there may be restrictions such as a decrease in measurement accuracy or speed (there are some models that do not have this restriction, but the higher the speed and accuracy of the model, the more restrictions tend to occur) .

In such a case, the position measuring device 28 may be installed not directly above the charged layer but diagonally above it to measure diagonally downward. The smaller the angle of depression (the angle formed by the line of sight to the object below with the horizontal), the fewer restrictions such as a decrease in measurement accuracy and measurement speed will occur, but if the angle of incidence of the laser on the top surface of the charging layer is small, , the unevenness of the upper surface of the charged layer may create a blind spot at the measurement position or reduce the accuracy of height measurement. For this reason, it is preferable that the depression angle is 15 degrees or more.

When measuring over a wide range in the length direction of the sintering machine 10 (the direction of movement of the pallet 26), the depression angle may be insufficient for a location far from the position measuring device 28. In such a case, a plurality of position measuring devices 28 may be installed.

<Measurement target position of position measuring device 28>
The purpose of the measurement by the position measuring device 28 is to understand the shrinkage of the charging layer due to the sintering reaction, so it is necessary to perform the measurement downstream of the ignition furnace 20 where the sintering reaction starts. Among these, it is preferable to measure at the ore discharge section 42 or its upstream vicinity (for example, within 2 m from the ore discharge section 42), where it is considered that the sintering reaction has finished proceeding. Thereby, it is possible to grasp the progress of sintering of the sintered cake after sintering.

Furthermore, measurements may be taken at two or more locations: near the ore discharge section 42 or its upstream side, and further upstream (for example, within a range of 10 to 90% of the distance from the ignition furnace 20 to the ore discharge section 42). is even more preferable. By measuring at two or more locations in the direction of movement of the pallet 26, and comparing with previous or subsequent measurements, it is possible to determine not only the progress of sintering of the sintered cake after sintering, but also the progress of sintering during the sintering process. It is also possible to grasp the progress rate of sintering. Understanding the progress rate of sintering is effective as information for preventing the progress of sintering from progressing too quickly, inhibiting the formation of a calcium ferrite phase or reducing strength. In addition, by measuring further upstream than the ore discharge section 42 or the vicinity of the upstream side thereof, the degree of sintering progress can be grasped more quickly than when measuring at the ore discharge section 42 or the vicinity of the upstream side thereof. Therefore, operational actions can be taken sooner to optimize the progress of the sintering reaction.

Furthermore, it is preferable to use the position measuring device 28 to measure two or more positions in the width direction that is horizontally orthogonal to the traveling direction of the pallet 26. As a result, even if there is a difference in the degree of progress of sintering in the width direction of the pallet 26, it can be made appropriate by adjusting the packing density of the charging layer in the width direction of the pallet 26.

<Measurement frequency of position measuring device 28>
Regarding the measurement frequency of the position measuring device 28, it is effective even if the measurement frequency is limited to timing when a change in the progress of the sintering reaction is expected, such as when changing the raw material composition, for example, but if the sintering raw material By setting the interval within the time required to pass the entire length of the sintering machine (for example, 20 minutes), and more preferably within 2 minutes, which can be considered as continuous measurement, unexpected components and particle sizes of the sintering raw material can be avoided. can respond to changes in

When the control unit 36 acquires the height position data of the top surface of the charging layer from the position measuring device 28, it calculates the amount of shrinkage of the charging layer and the shrinkage speed of the charging layer from the amount of descent of the top surface of the charging layer. The control unit 36 has a function of issuing an alarm and contacting an operator when the amount or speed of contraction of the charging layer is not appropriate, or having a device that controls the initial packing density of the charging layer. It has a function of transmitting a signal to change the initial packing density. The operator or the device for controlling the initial packing density of the charging layer that receives the signal from the control unit 36 adjusts the initial packing density of the charging layer based on a predetermined means, and adjusts the amount or speed of shrinkage of the charging layer. Control within a predetermined range.

The initial packing density of the charging layer can be adjusted by changing the particle size composition of the sintering raw material, but it takes more than 30 minutes to change the composition of the sintering raw material and start the adjustment. During this time, inappropriate operations will continue. As a method of quickly adjusting the initial packing density of the charge layer based on the amount of shrinkage of the charge layer or the shrinkage rate of the charge layer measured during the progress of the sintering process, adjusting the opening degree of the dividing gate 16, It is preferable to use one or more of adjusting the angle of the input chute 15 and adjusting the magnetic force of the magnetic brake 17. By adjusting the initial packing density of the charging bed using these methods, the time required to start adjustment can be reduced to less than 30 minutes.

For example, in the split gate 16, widening the opening of the split gate 16 increases the initial packing density of the charging layer, and narrowing the opening of the split gate 16 lowers the initial packing density of the charging layer. In this way, by adjusting the opening degree of the dividing gate 16, the initial packing density of the charging layer can be adjusted.

In addition, in the charging chute 15, by increasing the inclination angle of the charging chute 15 with respect to the horizontal plane, the initial packing density of the charging layer is increased, and by decreasing the inclination angle of the charging chute 15 with respect to the horizontal plane, the charging layer is increased. The initial packing density of the layer becomes low. In this way, by adjusting the inclination angle of the charging chute 15, the initial packing density of the charging layer can be adjusted.

Further, the magnetic brake 17 applies magnetic force to the magnetic ore contained in the sintering raw material to reduce the charging speed of the sintering raw material. This reduces the initial density of the charge layer. Therefore, in the magnetic brake 17, the initial packing density of the charging layer can be adjusted by adjusting the distance between the magnet and the charging chute or by adjusting the magnetic force of the magnetic brake 17.

Furthermore, instead of or in addition to these methods, it is preferred to use a vent rod to adjust the initial packing density. The ventilation rod is a rod-shaped or plate-shaped structure that is inserted into the charging layer formed on the pallet 26, and by inserting the ventilation rod, the initial packing density is prevented from increasing.

The thickness of the charge layer before ignition can be measured by a level meter 18. Furthermore, if a non-contact optical device such as a laser scanner, which has a wide measurement field of view and can measure a large number of measurement points at high speed, is used as the position measuring device 28, it is possible to measure the thickness of the charged layer after ignition and the load before ignition. It is also possible to measure both inlay thicknesses with the same position measuring device.

In addition, when a non-contact optical device such as a laser scanner is used as the position measuring device 28, the upper surface layer from which height position data has been acquired is divided into two or more parts in the width direction of the pallet 26, and the divided area is It is also possible to calculate the average height position at . For example, when the upper surface layer is divided into two in the width direction of the pallet 26, the average height in the near side area and the average height in the back side area are calculated using the center in the width direction as the boundary.

As explained above, according to the present invention, since the amount or shrinkage rate of the sintering raw material charge layer is measured during sintering, the progress of combustion of carbonaceous material and melting of the sintering raw material in the charge layer is measured. The situation can be measured with high precision, and the progress of combustion of carbonaceous materials and melting of sintering raw materials can be optimized as necessary.

Hereinafter, an example in which sintered ore was manufactured using the same device as the sintering machine 10 shown in FIGS. 1 and 2 will be described. In this embodiment, the charging gate is divided into four regions (region 1, region 2, region 3, and region 4) in the width direction of the pallet 26 according to the amount of shrinkage of the charging layer of the sintering raw material. The opening degree was adjusted (Example 1 of the present invention). Table 1 shows the results of Inventive Example 1 and the results of Comparative Example 1 in which the opening degree of the charging gate was not adjusted.

In this way, the initial packing density of the charging layer can be adjusted by adjusting the charging gate opening for each area divided in the width direction of the sintering machine, and the deviation in the amount of shrinkage of the sintering raw material charging layer can be adjusted. By reducing the sintering yield and product TI strength, it was possible to improve the sintering yield and the product TI strength.

10 Sintering machine 12 Surge hopper 14 Roll feeder 15 Charging chute 16 Dividing gate 17 Magnetic brake 18 Level meter 20 Ignition furnace 22 Wind box 24 Blower 26 Pallet 28 Position measuring device 29 Thermometer 30 Discharge section camera 32 Control device 34 Storage Section 36 Control section 38 Red Tropical 40 Ore supply section 42 Ore discharge section

Claims (20)

Sintering raw materials are charged into a circulating pallet to form a charging layer, the upper surface layer of the charging layer is ignited using an ignition furnace, and air is sucked from below the charging layer to cause the sintering. A method for producing sintered ore, comprising: burning carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore,
Sintered ore, characterized in that the amount of shrinkage of the charged layer after ignition is measured, and the initial packing density of the charged layer is adjusted so that the amount of shrinkage of the charged layer is within a predetermined range. manufacturing method. Sintering raw materials are charged into a circulating pallet to form a charging layer, the upper surface layer of the charging layer is ignited using an ignition furnace, and air is sucked from below the charging layer to cause the sintering. A method for producing sintered ore, comprising: burning carbonaceous material contained in the sintering raw material to produce a sintered cake, and then discharging the sintered cake from an ore discharge section to produce sintered ore,
Sintered ore, characterized in that the shrinkage rate of the charge layer after ignition is measured, and the initial packing density of the charge layer is adjusted so that the shrinkage rate of the charge layer is within a predetermined range. manufacturing method. The sintered ore according to claim 1, wherein the measurement is performed at two or more locations in the width direction of the pallet, and the initial packing density of the charging layer is adjusted in the width direction of the pallet. Production method. The sintered ore according to claim 2, wherein the measurement is performed at two or more locations in the width direction of the pallet, and the initial packing density of the charging layer is adjusted in the width direction of the pallet. Production method. The method for producing sintered ore according to claim 1, wherein the measurement is performed at two or more locations in the direction of movement of the pallet. The method for manufacturing sintered ore according to claim 2, wherein the measurement is performed at two or more locations in the direction of movement of the pallet. 4. The method for producing sintered ore according to claim 3, wherein the measurement is performed at two or more locations in the direction of movement of the pallet. The method for manufacturing sintered ore according to claim 4, wherein the measurement is performed at two or more locations in the direction of movement of the pallet. The method for manufacturing sintered ore according to any one of claims 1 to 8, wherein the measurement includes measuring the height position of the upper surface of the charging layer. The method for producing sintered ore according to claim 9, wherein the measurement is performed without contacting the charging layer. A pallet that circulates, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites the carbon material on the surface of the charging layer, and is installed below the pallet. A sintering machine that has a wind box that sucks air from below the charging layer, and sinters the sintering raw material using the combustion heat of carbonaceous material contained in the sintering raw material,
It has a position measuring device that measures the amount of shrinkage of the charge layer after ignition, and has a function of adjusting the initial packing density of the charge layer so that the amount of shrinkage of the charge layer is within a predetermined range. A sintering machine comprising: A pallet that circulates, an ore feeding section that charges sintering raw materials into the pallet to form a charging layer, an ignition furnace that ignites the carbon material on the surface of the charging layer, and is installed below the pallet. A sintering machine having a wind box that sucks air from below the charging layer, and sintering the sintering raw material using combustion heat of carbonaceous material contained in the sintering raw material,
It has a position measuring device that measures the shrinkage speed of the charge layer after ignition, and has a function of adjusting the initial packing density of the charge layer so that the shrinkage speed of the charge layer is within a predetermined range. A sintering machine comprising: 12. The position measuring device has a function of measuring two or more locations in the width direction of the pallet and adjusting the initial packing density of the charging layer in the width direction of the pallet. sintering machine. 13. The position measuring device has a function of measuring two or more locations in the width direction of the pallet and adjusting the initial packing density of the charging layer in the width direction of the pallet. sintering machine. The sintering machine according to claim 11, characterized in that the position measuring device measures two or more locations in the direction of movement of the pallet. The sintering machine according to claim 12, characterized in that the position measuring device measures two or more locations in the direction of movement of the pallet. The sintering machine according to claim 13, characterized in that the position measuring device measures two or more locations in the direction of movement of the pallet. The sintering machine according to claim 14, characterized in that the position measuring device measures two or more locations in the direction of movement of the pallet. The sintering machine according to any one of claims 11 to 18, wherein the position measuring device measures the height position of the upper surface of the charged layer. The sintering machine according to claim 19, characterized in that the position measuring device measures without contacting the charging layer.

Images