JP7705036B2 - Sintered ore manufacturing method and sintered ore manufacturing device - Google Patents

Description

The present invention relates to a method and an apparatus for producing sintered ore, in which raw sintered material is sintered in a traveling sintering pallet and the sinter cake formed in the sintering pallet is crushed with a crusher to obtain sintered ore.

2. Description of the Related Art Conventionally, sintered ore obtained by sintering a sintering raw material made of powder of iron ore or the like has been used as a raw material to be charged into a blast furnace.
As described in Patent Documents 1-3, for example, a sintering machine for producing sintered ore includes a rail section connecting the ore supply section and the ore discharge section, a plurality of sintering pallet carts running along the rail section, an ignition furnace arranged above the sintering pallet cart behind the ore supply section, a suction section arranged below the sintering pallet cart, a crusher for crushing the sinter cake discharged from the sintering pallet cart, and a crushing guide for guiding the sinter cake discharged from the sintering pallet to the crusher behind the ore discharge section.

In this type of sintering machine, the carbonaceous material in the surface layer of the sintering raw material is ignited in the ignition furnace, and then the sintering pallet cart filled with the sintering raw material is transported to the ore discharge section while being sucked in by the suction section below the sintering pallet cart, moving the combustion point of the carbonaceous material in the sintering raw material inside the sintering pallet cart and causing the sintering reaction to proceed from the top to the bottom of the sintering raw material, producing a sintered mass called a sinter cake. This sinter cake is discharged to a crusher by a crushing guide in the ore discharge section, where it is crushed to the specified particle size for sintered ore to be used in the blast furnace.

The sinter cake formed in the sintering pallet cart falls into the crushing guide when the sintering pallet cart moves and tilts along the outer periphery of the sprocket in the ore discharge section, and is guided by the crushing guide to the crusher.
Here, in the sintering machines described in Patent Documents 1 to 3, a support stand is provided inside the sintering pallet cart to support a sinter cake formed on the upper part during the sintering process and to maintain air permeability below the sintering raw material packed bed.

Japanese Patent Application Publication No. 04-168234 Japanese Patent Application Publication No. 11-108564 JP 2011-179754 A

However, as mentioned above, when the support stands are arranged inside the sintering pallet cart, the sinter cake is released from the sintering pallet cart in the ore discharge section of the sintering machine at a position closer to the top of the crushing guide. This means that the sinter cake comes into contact with the top of the crushing guide without being released from the sintering pallet cart. In this case, not all of the sinter cake is discharged from the ore discharge section of the sintering machine, and some of the sinter cake remains between the support stands. This falls after passing through the crushing guide, and part of the sinter cake (sinter cake pieces) tends to flow into the back chute provided on the back side of the crushing guide, causing the back chute to become clogged, which is a problem that hinders the stable operation of the sintering machine.

The present invention was made in consideration of the above-mentioned situation, and aims to provide a method and an apparatus for producing sintered ore that can prevent the sinter cake from flowing into the back chute and can stably produce sintered ore.

In order to solve the above-mentioned problems, the present inventors conducted intensive studies and found that the size of the sinter cake pieces flowing into the back chute is about 150 mm.
The inventors conducted repeated tests using actual equipment and discovered that in stand sintering, by optimizing the gap between the crushing guide and the sintering pallet, it is possible to prevent the sinter cake from flowing into the back chute.

The present invention has been made based on the above-mentioned findings, and the method for producing sintered ore according to the present invention is a method for producing 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. The method is configured to guide the sinter cake discharged from the sintering pallet to the crusher using a crushing guide, and a support stand arranged parallel to the traveling direction of the sintering pallet is erected in the sintering pallet, and the crushing guide is formed with a main body wall that is inserted into the sintering pallet, and a slit is formed in this main body wall through which the support stand passes, and during operation, the distance L between the tip of the main body wall inserted into the sintering pallet and the bottom surface of the sintering pallet is set to be 50 mm or more and 150 mm or less, and is within the range of 1/8 x H≦L≦1/2 x H with respect to the height H of the support stand .

In addition, the sintered ore manufacturing apparatus of the present invention is a sintered ore manufacturing apparatus having a plurality of traveling sintered pallets, a crusher for crushing the sinter cake formed within the sintered pallets, and a crushing guide for guiding the sinter cake discharged from the sintered pallet to the crusher, wherein a support stand arranged parallel to the traveling direction of the sintered pallet is erected within the sintered pallet, and the crushing guide has a main body wall that is inserted into the sintered pallet, and a slit through which the support stand passes is formed in this main body wall, and 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 x H≦L≦1/2 x H with respect to the height H of the support stand .

According to the sintered ore manufacturing method and sintered ore manufacturing device configured as described above, the crushing guide is formed with a main body wall that is inserted into the sintering pallet, and a slit is formed in this main body wall through which the support stand passes. During high temperature operation, the distance between the tip of the main body wall inserted into the sintering pallet and the bottom surface of the sintering pallet is set to 150 mm or less, so that 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. Therefore, clogging of the back chute can be suppressed, and sintered ore can be produced stably.

The present invention provides a method and an apparatus for producing sintered ore that can prevent the sinter cake from flowing into the back chute and can stably produce sintered ore.

1 is a schematic explanatory diagram of a sintered ore manufacturing apparatus according to an embodiment of the present invention. FIG. FIG. 2 is an explanatory diagram of a sintered pallet used in the sintered ore manufacturing apparatus shown in FIG. 1 . FIG. 2 is a front view of a crushing guide used in the sintered ore manufacturing apparatus shown in FIG. 1 . This is a cross-sectional view taken along the line XX in FIG. FIG. 2 is an explanatory diagram showing the positional relationship between a sintering pallet and a crushing guide during operation in the sintered ore manufacturing apparatus shown in FIG. 1 .

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for producing sintered ore and an apparatus for producing sintered ore according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
The sintered ore manufacturing method and sintered ore manufacturing apparatus according to the present embodiment are for manufacturing sintered ore, which is a raw material to be fed into a blast furnace.

As shown in FIG. 1, the sintered ore manufacturing device 1 of this embodiment includes a pair of sprockets 2A and 2B arranged on the ore supply side and the ore discharge side, a rail section 3 connecting the sprockets 2A and 2B, a plurality of sintering pallet carts 4 that run on wheels along the rail section 3, a bedding hopper 5 that supplies bedding ore to the bottom surface 4A of the sintering pallet cart 4 to form a bedding layer, a raw material charging hopper 6 that fills the bedding layer with sintering raw material M, an ignition furnace 7 arranged above the sintering pallet cart 4 being transported, a lower suction section 8 located below the sintering pallet cart 4, a crusher 9 that crushes the sintered sinter cake S, and a crushing guide 10 that guides the sinter cake S discharged from the sintering pallet cart 4 to the crusher 9.

As shown in FIG. 2, the sintering pallet cart 4 is provided with a support stand 4C to support the sinter cake S formed on the upper part during the sintering process and to maintain ventilation under the sintering raw material packed bed. That is, in this sintering pallet cart 4, the side wall portion 4B and the support stand 4C are erected with a gap in the width direction. In addition, a grade bar is provided on the bottom surface 4A of the sintering pallet cart 4.

The crushing guide 10 is disposed between the sprocket 2B on the ore discharge side and the crusher 9 as shown in FIG. 1, and the front view shown in FIG. 3 is a view seen from the crusher 9 side.
In the cross-sectional view of FIG. 4, the sprocket 2B on the ore discharge 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.

As shown in Figures 3 and 4, this crushing guide 10 comprises a base frame portion 11, a main body wall 20 erected from the rear side (left side in Figure 4) of the base frame portion 11, and a guide portion 30 extending from the upper part of the main body wall 20 toward the front side (right side in Figure 4) of the base frame portion 11.
In this embodiment, the main body wall 20 is provided so as to be gradually inclined toward the front side as it extends upward from the base frame portion 11. Also, the guide portion 30 is provided so as to be gradually inclined toward the rear side as it extends upward from the base frame portion 11.

Here, the main body wall 20 is configured so that its upper end portion is inserted into the inside of the sintering pallet cart 4 which moves along the outer periphery of the sprocket 2B on the ore discharge section side.
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 to allow the above-mentioned support stand 4C to pass through.

In the sintered ore manufacturing apparatus 1 having such a configuration, sintered ore is manufactured as follows.
First, as shown in Fig. 1, bedding ore is supplied from a bedding hopper 5 to a sintering pallet cart 4 that runs on wheels along a rail section 3, and a bedding layer is formed on the bottom surface 4A of the sintering pallet cart 4. Furthermore, sinter raw material M is supplied from a raw material charging hopper 6. The sintering pallet cart 4 filled with the sintering raw material M is transported, and the carbonaceous material in the surface layer of the sintering raw material M is ignited in an ignition furnace 7. By sucking with a lower suction section 8 while the sintering pallet cart 4 moves to the ore discharge section side, the combustion point of the carbonaceous material moves from the upper side to the lower side of the sintering raw material M, sintering progresses, and a sinter cake S is produced.

Then, the sintering pallet cart 4 tilts as it moves along the sprocket 2B on the ore discharge side, and the sinter cake S in the sintering pallet cart 4 falls toward the guide portion 30 of the crushing guide 10.
The dropped sinter cake S slides along the guide portion 30 of the crushing guide 10 and is guided to the crusher 9. The sinter cake S is then crushed by the crusher 9 to produce sintered ore.

In this embodiment, since the support stand 4C is provided inside the sintering pallet cart 4, the sinter cake S may not fall until the sintering pallet cart 4 is tilted significantly at the sprocket 2B. In such a case, when the sinter cake S comes into contact with the tip of the main body wall 20, it will fall due to the impact.

Here, in the sintered ore manufacturing apparatus 1 according to the present embodiment, the apparatus is heated to, for example, 400° C. or higher during operation, so that the rail portion 3 and the like undergo thermal expansion.
In this embodiment, when in a thermally expanded state during operation, the distance L between the tip of the main body wall 20 of the crushing guide 10 inserted into the sintering pallet cart 4 and the bottom surface 4A of the sintering pallet cart 4 is configured to be 150 mm or less.

In addition, the distance L between the tip of the main body wall 20 of the crushing guide 10 inserted into the sintering pallet cart 4 and the bottom surface 4A of the sintering pallet cart 4 is preferably 120 mm or less, and more preferably 100 mm or less.
In addition, there is no particular limit to the lower limit of the distance L between the tip of the main body wall 20 of the crushing guide 10 inserted into the sintering pallet cart 4 and the bottom surface 4A of the sintering pallet cart 4, but in order to reliably suppress interference between the sintering pallet cart 4 and the main body wall 20, it is preferable to make it 50 mm or more, and it is more preferable to make it 70 mm or more.
Furthermore, it is preferable that the distance L between the tip of the main body wall 20 of the crushing guide 10 inserted into the sintering pallet cart 4 and the bottom surface 4A of the sintering pallet cart 4 is within the range of 1/8 x H≦L≦1/2 x H relative to the height H of the support stand 4C.

According to the sintered ore manufacturing device 1 and sintered ore manufacturing method of the present embodiment configured as described above, the crushing guide 10 has a main body wall 20 that is inserted into the sintering pallet cart 4, 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, the distance L between the tip of the main body wall 20 inserted into the sintering pallet cart 4 and the bottom surface 4A of the sintering pallet cart 4 is set to 150 mm or less, so that 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 sintered ore can be produced stably.

The above describes in detail the sintered ore manufacturing apparatus and sintered ore manufacturing method according to an embodiment of the present invention, but the present invention is not limited thereto and can be modified as appropriate without departing from the technical concept of the invention.
For example, in this embodiment, a Dwight Lloyd type sintering machine having sprockets on both the ore supply side and the ore discharge side has been described as a specific example, but this is not limited to this, and the present invention can also be applied to a Coppers type sintering machine that does not have a sprocket on the ore discharge side (driven side).

1 Sintered ore manufacturing device 4 Sintered pallet 4A Bottom surface 4C Support stand 10 Crushing guide 20 Body wall 25 Slit

Claims (2)

A method for producing sintered ore, comprising the steps of: sintering raw materials in a traveling sintering pallet; and crushing a sinter cake formed in the sintering pallet with a crusher to obtain sintered ore,
A crushing guide is used to guide the sinter cake discharged from the sintering pallet to the crusher,
A support stand is provided in the sintering pallet in parallel with the moving direction of the sintering pallet,
The crushing guide has a body wall that is inserted into the sintering pallet, and a slit through which the support stand passes is formed in the body wall.
A method for producing sintered ore, characterized in that, during operation, the distance L between the tip of the main body wall inserted into the sintering pallet and the bottom surface of the sintering pallet is 50 mm or more and 150 mm or less, and is within the range of 1/8 x H≦L≦1/2 x H with respect to the height H of the support stand. A sintered ore manufacturing apparatus having a plurality of traveling sintered pallets, a crusher for crushing sintered cakes formed in the sintered pallets, and a crushing guide for guiding the sintered cakes discharged from the sintered pallets to the crusher,
A support stand is provided in the sintering pallet in parallel with the moving direction of the sintering pallet,
The crushing guide has a body wall that is inserted into the sintering pallet, and a slit through which the support stand passes is formed in the body wall.
A sintered ore manufacturing apparatus characterized in that, during operation, the distance L between the tip of the main body wall inserted into the sintering pallet and the bottom surface of the sintering pallet is 50 mm or more and 150 mm or less, and is within the range of 1/8 x H≦L≦1/2 x H with respect to the height H of the support stand .

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