Method for producing sintered ore and apparatus for producing sintered ore

Abstract

To provide a method for manufacturing a sintered ore which can suppress inflow of a sinter cake to a back chute, and can stably manufacture a sintered ore.SOLUTION: A method for manufacturing a sintered ore sinters a sintered raw material in a traveling sinter pallet 4, crushes a sinter cake formed in the sinter pallet 4 by a crusher and obtains a sintered ore, and is configured to guide the sinter cake discharged from the sinter pallet 4 to a crusher using a crushing guide 10, wherein a support stand 4C arranged parallel to a travel direction of the sinter pallet 4 is erected in the sinter pallet 4, the crushing guide 10 is formed with a body wall 20 inserted into the sinter pallet 4, the body wall 20 is formed with a slit 25 for passing the support stand 4c therethrough, and in operation, a distance L between the tip of the body wall 20 inserted into the sinter pallet 4 and a bottom surface 4A of the sinter pallet 4 is set at 150 mm or less.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a method for manufacturing sintered ore in which sintering raw materials are sintered in a traveling sintering pallet, and the sinter cake formed in the sintering pallet is crushed by a crusher to obtain sintered ore, and an apparatus for manufacturing sintered ore.

Background Art

[0002] Conventionally, sintered ore obtained by sintering sintering raw materials composed of iron ore powder or the like has been used as a raw material to be charged into a blast furnace. As described in Patent Documents 1 to 3, for example, a sintering machine for manufacturing sintered ore includes a rail portion connecting a feeding portion side and a discharging portion, a plurality of sintering pallet cars traveling along the rail portion, an ignition furnace disposed above the sintering pallet car behind the feeding portion, a suction portion disposed below the sintering pallet car, a crusher for crushing the sinter cake discharged from the sintering pallet car, and a crushing guide for guiding the sinter cake discharged from the sintering pallet to the crusher behind the discharging portion.

[0003] In such a sintering machine, after igniting the carbon material in the surface layer of the sintering raw material with an ignition furnace, while transferring the sintering pallet car filled with the sintering raw material to the discharging portion side, suction is performed by the suction portion below the sintering pallet car, so that the combustion point of the carbon material in the sintering raw material in the sintering pallet car is moved, and a sintering reaction proceeds from the upper side to the lower side of the sintering raw material to generate a sintered mass called a sinter cake. This sinter cake is discharged to the crusher by the crushing guide at the discharging portion, and the sinter cake is crushed by the crusher to have a predetermined particle size of the sintered ore used in the blast furnace.

[0004] The sinter cake formed in the sintering pallet car falls to the crushing guide when the sintering pallet car moves and tilts along the outer periphery of the sprocket at the discharging portion, and is guided to the crusher by this crushing guide. Here, in the sintering machines described in Patent Documents 1-3, support stands are disposed inside the sintering pallet carriages to support the sinter cake formed at the upper part during the sintering process and to maintain the air permeability at the lower part of the sintering raw material filling layer.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, as described above, when support stands are disposed in the sintering pallet carriage, the separation of the sinter cake from the sintering pallet carriage in the discharge section of the sintering machine occurs at a position closer to the top of the crushing guide. For this reason, the sinter cake comes into contact with the top of the crushing guide without separating from the sintering pallet carriage. At this time, not all of the sinter cake is discharged at the discharge section of the sintering machine, and a part of the sinter cake remains between the support stands, and it falls after passing through the crushing guide, and a part of the sinter cake (sinter cake pieces) easily flows into the back chute provided on the back side of the crushing guide, resulting in clogging of the back chute, and it has been found that there is a problem of hindering the stable operation of the sintering machine.

[0007] The present invention has been made in view of the above-described situation, and an object thereof is to provide a method for manufacturing sintered ore capable of suppressing the flow of the sinter cake into the back chute and stably manufacturing sintered ore, and a manufacturing apparatus for sintered ore.

Means for Solving the Problems

[0008] In order to solve the above problems, as a result of intensive studies by the present inventors, it has been found that the size of the sinter cake pieces flowing into the back chute is about 150 mm. Then, the present inventors repeated actual machine tests and obtained the knowledge that the flow of the sinter cake into the back chute can be suppressed by optimizing the gap between the crushing guide and the sinter pallet in the stand sintering.

[0009] The present invention has been made based on the above findings. The method for manufacturing sintered ore according to the present invention is a method for manufacturing sintered ore in which a sintering raw material is sintered in a traveling sinter pallet, and the sinter cake formed in the sinter pallet is crushed by a crusher to obtain sintered ore. It is a method for manufacturing sintered ore, and is configured to guide the sinter cake discharged from the sinter pallet to the crusher using a crushing guide. In the sinter pallet, support stands are erected in parallel with the traveling direction of the sinter pallet. In the crushing guide, a main body wall inserted into the sinter pallet is formed, and a slit through which the support stand passes is formed in this main body wall. During operation, the tip of the main body wall inserted into the sinter pallet and the bottom surface of the sinter pallet The distance L is set to be 50 mm or more and 150 mm or less, within the range of 1 / 8×H ≤ L ≤ 1 / 2×H with respect to the height H of the support stand. This is characterized by.

[0010] Further, the manufacturing apparatus for sintered ore according to the present invention includes a plurality of traveling sinter pallets, a crusher that crushes the sinter cake formed in the sinter pallet, and a crushing guide that guides the sinter cake discharged from the sinter pallet to the crusher. It is a manufacturing apparatus for sintered ore having, in the sinter pallet, support stands erected in parallel with the traveling direction of the sinter pallet, and in the crushing guide, a main body wall inserted into the sinter pallet is formed, and a slit through which the support stand passes is formed in this main body wall. During operation, the tip of the main body wall inserted into the sinter pallet and the bottom surface of the sinter pallet The distance L is 50 mm or more and 150 mm or less, and is within the range of 1 / 8×H ≤ L ≤ 1 / 2×H with respect to the height H of the support stand. This is characterized by.

[0011] According to the method for manufacturing a sintered ore and the manufacturing apparatus for a sintered ore having the above-described configuration, the crushing guide is formed with a main body wall inserted into the sintered pallet, and a slit through which the support stand passes is formed in the main body wall. In the high-temperature state during operation, the distance between the tip of the main body wall inserted into the sintered pallet and the bottom surface of the sintered pallet is set to 150 mm or less. Therefore, the discharge of the sinter cake located between the support stands can be promoted by the main body wall of the crushing guide, and the flow of the sinter cake into the back chute can be suppressed. Thus, clogging of the back chute can be suppressed, and it becomes possible to stably manufacture sintered ore.

Effects of the Invention

[0012] According to the present invention, it is possible to provide a method for manufacturing a sintered ore and a manufacturing apparatus for a sintered ore that can suppress the flow of the sinter cake into the back chute and can stably manufacture the sintered ore.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0014] Hereinafter, a method for manufacturing a sintered ore and a manufacturing apparatus for a sintered ore according to an embodiment of the present invention will be described with reference to the accompanying drawings. The method for manufacturing sintered ore and the manufacturing apparatus for sintered ore according to the present embodiment are for manufacturing sintered ore which is a raw material to be charged into a blast furnace.

[0015] As shown in FIG. 1, the sintered ore manufacturing apparatus 1 according to the present embodiment includes a pair of sprockets 2A and 2B respectively arranged on the ore feeding section side and the ore discharging section side, a rail section 3 connecting between these sprockets 2A and 2B, a plurality of sintering pallet trolleys 4 traveling along the rail section 3 by wheels, a bedding hopper 5 for supplying bedding ore to the bottom surface 4A of the sintering pallet trolley 4 to form a bedding layer, a raw material charging hopper 6 for filling sintering raw material M on the bedding layer, an ignition furnace 7 arranged above the conveyed sintering pallet trolley 4, a lower suction section 8 located on the lower side of the sintering pallet trolley 4, a crusher 9 for crushing the sinter cake S obtained by sintering, and a crushing guide 10 for guiding the sinter cake S discharged from the sintering pallet trolley 4 to the crusher 9.

[0016] As shown in FIG. 2, the sintering pallet trolley 4 is provided with a support stand 4C for supporting the sinter cake S formed on the upper part during the sintering process and maintaining the air permeability of the lower part of the sintering raw material filling layer. That is, in this sintering pallet trolley 4, the side wall part 4B and the support stand 4C are erected at intervals in the width direction. In addition, a grade bar is arranged on the bottom surface 4A of the sintering pallet trolley 4.

[0017] As shown in FIG. 1, the crushing guide 10 is arranged between the sprocket 2B on the ore discharging section side and the crusher 9. The front view shown in FIG. 3 is a view seen from the crusher 9 side. Also, in the cross-sectional view of FIG. 4, the sprocket 2B on the ore discharging section side is located on the left side of the crushing guide 10, and the crusher 9 is located on the right side of the crushing guide 10.

[0018] As shown in FIGS. 3 and 4, this crashing guide 10 includes a pedestal frame portion 11, a main body wall 20 erected from the back side (left side in FIG. 4) portion of the pedestal frame portion 11, and a guide portion 30 extending from the upper portion of the main body wall 20 toward the front side (right side in FIG. 4) portion of the pedestal frame portion 11. In this embodiment, the main body wall 20 is provided so as to be inclined gradually toward the front side as it goes upward from the pedestal frame portion 11. Further, the guide portion 30 is provided so as to be inclined gradually toward the back side as it goes upward from the pedestal frame portion 11.

[0019] Here, the upper end portion of the main body wall 20 is configured to be inserted into the inside of the sinter pallet bogie 4 that moves along the outer periphery of the sprocket 2B on the ore discharging portion side. Further, as shown in FIG. 4, a plurality of slits 25 are formed in the width direction at the upper end portion of the main body wall 20. These slits 25 are provided for the above-described support stand 4C to pass through.

[0020] In the sintered ore manufacturing apparatus 1 configured as described above, sintered ore is manufactured as follows. First, as shown in FIG. 1, floor ore is supplied from the floor hopper 5 to the sinter pallet bogie 4 traveling by wheels along the rail portion 3, and a floor layer is formed on the bottom surface 4A of the sinter pallet bogie 4. Further, the sintering raw material M is supplied from the raw material charging hopper 6. The sinter pallet bogie 4 filled with the sintering raw material M is transferred, and the carbon material in the surface layer of the sintering raw material M is ignited in the ignition furnace 7. While the sinter pallet bogie 4 moves toward the ore discharging portion side, the combustion point of the carbon material is moved from the upper side to the lower side of the sintering raw material M by suction by the lower suction portion 8, and sintering proceeds, and the sinter cake S is manufactured.

[0021] Then, as the sinter pallet bogie 4 moves along the sprocket 2B on the ore discharging portion side, it inclines, and the sinter cake S in the sinter pallet bogie 4 falls toward the guide portion 30 of the crashing guide 10. The fallen sinter cake S slides along the guide portion 30 of the crashing guide 10 and is guided to the crusher 9. Then, the sinter cake S is crushed by the crusher 9 to produce sintered ore.

[0022] In addition, in this embodiment, since the support stand 4C is disposed in the sinter pallet car 4, the sinter cake S may not fall until the sinter pallet car 4 tilts significantly in the sprocket 2B. In such a case, when the sinter cake S contacts the tip of the main body wall 20, it will fall due to the impact.

[0023] Here, in the sintered ore manufacturing apparatus 1 of this embodiment, during operation, since it is heated to 400 °C or higher, for example, the rail portion 3 and the like will thermally expand. In this embodiment, in the state of thermal expansion during operation, the distance L between the tip of the main body wall 20 of the crashing guide 10 inserted into the sinter pallet car 4 and the bottom surface 4A of the sinter pallet car 4 is configured to be 150 mm or less.

[0024] The distance L between the tip of the main body wall 20 of the crashing guide 10 inserted into the sinter pallet car 4 and the bottom surface 4A of the sinter pallet car 4 is preferably 120 mm or less, and more preferably 100 mm or less. Also, there is no particular limitation on the lower limit of the distance L between the tip of the main body wall 20 of the crashing guide 10 inserted into the sinter pallet car 4 and the bottom surface 4A of the sinter pallet car 4. However, in order to surely suppress the interference between the sinter pallet car 4 and the main body wall 20, it is preferably 50 mm or more, and more preferably 70 mm or more. Furthermore, the distance L between the tip of the main body wall 20 of the crashing guide 10 inserted into the sinter pallet car 4 and the bottom surface 4A of the sinter pallet car 4 is preferably in the range of 1 / 8 × H ≤ L ≤ 1 / 2 × H with respect to the height H of the support stand 4C.

[0025] According to the manufacturing apparatus 1 for sintered ore and the manufacturing method for sintered ore of the present embodiment configured as described above, in the crushing guide 10, a main body wall 20 inserted into the sintered pallet trolley 4 is formed, and a slit 25 through which the support stand 4C passes is formed in the main body wall 20. In the high-temperature state during operation, since the distance L between the tip of the main body wall 20 inserted into the sintered pallet trolley 4 and the bottom surface 4A of the sintered pallet trolley 4 is 150 mm or less, the discharge of the sinter cake S located between the support stands 4C can be promoted by the main body wall 20 of the crushing guide 10, and the flow of the sinter cake S into the back chute can be suppressed. Therefore, clogging of the back chute can be suppressed, and it becomes possible to stably manufacture sintered ore.

[0026] As described above, the manufacturing apparatus for sintered ore and the manufacturing method for sintered ore according to the embodiment of the present invention have been specifically described. However, the present invention is not limited thereto, and can be appropriately modified without departing from the technical idea of the invention. For example, in the present embodiment, a Dwight Lloyd type sintering machine having sprockets on both the ore feeding section side and the ore discharging section side has been described as a specific example. However, the present invention is not limited thereto, and it can be similarly applied to a Copperas type without a sprocket on the ore discharging section side (driven side).

Explanation of reference numerals

[0027] 1 Manufacturing apparatus for sintered ore 4 Sintered pallet 4A Bottom surface 4C Support stand 10 Crushing guide 20 Main body wall 25 Slit

Claims

1. A method for manufacturing sintered ore, which involves sintering a sintering raw material within a traveling sintered pallet and crushing a sinter cake formed within the sintered pallet with a crusher to obtain sintered ore, comprising: a configuration in which a sinter cake discharged from the sintered pallet is guided to the crusher using a crushing guide; support stands are erected within the sintered pallet in parallel with the traveling direction of the sintered pallet; a main body wall inserted into the sintered pallet is formed in the crushing guide, and a slit through which the support stand passes is formed in this main body wall; During operation, the distance L between the tip of the main body wall inserted into the sintered pallet and the bottom surface of the sintered pallet is 50 mm or more and 150 mm or less, and is within the range of 1 / 8 × H ≤ L ≤ 1 / 2 × H with respect to the height H of the support stand. A method for manufacturing sintered ore, characterized by this.

2. A manufacturing apparatus for sintered ore, comprising a plurality of traveling sintered pallets, a crusher for crushing a sinter cake formed within the sintered pallet, and a crushing guide for guiding a sinter cake discharged from the sintered pallet to the crusher, support stands are erected within the sintered pallet in parallel with the traveling direction of the sintered pallet; a main body wall inserted into the sintered pallet is formed in the crushing guide, and a slit through which the support stand passes is formed in this main body wall; During operation, the distance L between the tip of the main body wall inserted into the sintered pallet and the bottom surface of the sintered pallet is 50 mm or more and 150 mm or less, and is within the range of 1 / 8 × H ≤ L ≤ 1 / 2 × H with respect to the height H of the support stand. A manufacturing apparatus for sintered ore, characterized by this.

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