Slag separation method, refractory brick recycling method, slag separation device

Abstract

To more efficiently separate slag from a refractory brick being a processing target.SOLUTION: A slag separation method for separating slag from a refractory brick Br being a processing target which is the refractory brick Br in which the slag is attached to its surface, includes: dividing the refractory brick Br being the processing target into several pieces; and applying a load due to drop impact to the divided refractory brick Br being the processing target to separate the slag from the refractory brick Br being the processing target. The separation of the slag is executed by placing the refractory brick Br being the processing target into a dish-shaped container 1 which consists of a rotating cylindrical body with a low height of an outer peripheral wall 1B relative to the diameter D and rotating the dish-shaped container 1 around a rotary shaft inclined from a vertical axis.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a technique for separating slag adhering to refractory bricks to be treated, such as used refractory bricks, for the reuse of the refractory bricks to be treated.

Background Art

[0002] In recent years, in order to improve the recycling efficiency in iron-making facilities that carry out steelmaking processes, etc., it has been proposed to reuse refractory bricks used in the steelmaking process.

[0003] Refractory bricks are heat-storing bricks that can withstand high temperatures exceeding 1000°C and are used as top bricks, converter bricks, etc. Generally, on the operating surface (the surface in contact with molten steel or slag) side of the refractory bricks, iron or slag adheres through the pores in the refractory bricks, forming a slag layer. In addition, mortar may also be partially adhered to other surfaces of the refractory bricks.

[0004] When reusing refractory bricks, if slag or the like is mixed into the reused bricks, the durability of the refractory bricks will be significantly reduced and they will become unusable. Therefore, it is necessary to remove the adhering slag or the like from the recycled bricks.

[0005] Currently, after manually striking to peel off the slag or the like adhering to the surface of each refractory brick, the refractory brick itself is crushed and used as a brick material for recycling. However, this method only reuses a part of the refractory bricks despite taking a lot of time. That is, when performing the conventional manual chipping work, it was not satisfactory in terms of work efficiency and running costs.

[0006] For this reason, in order to efficiently recycle refractory bricks, it is necessary to enable the automatic and large-scale separation of the adhering slag from the refractory bricks. In response to this, devices have been proposed that can automatically remove cement, mortar, paint, etc., adhering to the surface of metal workpieces, such as the drum-type scraping device described in Patent Document 1 and the water jet scraping device described in Patent Document 2. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2020-131400 [Patent Document 2] Japanese Patent Publication No. 2001-9390 [Overview of the Initiative] [Problems that the invention aims to solve]

[0008] However, the above-mentioned conventional technology has the following problems. It is desirable to remove as much of the slag and other material adhering to the surface of the base material as possible. However, the hardness of the refractory brick is approximately 9.6 MPa, while the hardness of the adhering slag is approximately 14.0 MPa, meaning that the brick, which is the base material, is harder than the adhering slag. The inventors then found that simply using the scraping apparatus disclosed in Patent Document 1 or 2 could easily result in excessive scraping, potentially reducing the brick yield. Specifically, when refractory bricks were being processed with the scraping apparatus disclosed in Patent Document 1 or 2, the bricks, being the base material, were less hard than the attached slag. This resulted in excessive scraping of the refractory bricks, leading to a decrease in the recycling yield.

[0009] This invention was made in view of the above-mentioned points, and aims to enable more efficient separation of slag from refractory bricks to be processed. [Means for solving the problem]

[0010] After various studies, the inventor considered that the base material, the brick, is less hard than the attached slag, and therefore devised a method to make the surface-adhered slag easily removable and then apply instantaneous force. By applying instantaneous force to detach and separate the surface-adhered slag from the brick, it was found that even though the base material, the brick, is less hard than the attached slag, it is possible to efficiently separate the attached slag while suppressing a decrease in the brick recycling yield.

[0011] To address the problem, one aspect of the present invention provides a slag separation method for separating slag from a refractory brick to be treated, which is a refractory brick with slag adhering to its surface, wherein the refractory brick to be treated is divided into a plurality of blocks, and the slag is separated from the refractory brick by applying a load due to impact from dropping to the divided refractory bricks to be treated.

[0012] Slag separation is performed, for example, by placing the divided refractory bricks to be processed into a dish-shaped container made of a rotating cylindrical body with a low outer wall height relative to its diameter, and then rotating the dish-shaped container on a rotation axis that is inclined from the vertical axis. [Effects of the Invention]

[0013] According to one aspect of the present invention, as a pretreatment, the refractory brick to be treated is divided into multiple pieces to make it easier to remove the slag adhering to the surface. Then, by applying an instantaneous force by dropping the divided refractory brick to be treated, the slag adhering to the surface of the refractory brick is peeled off and separated from the brick.

[0014] Slag separation is achieved, for example, by tilting the axis of rotation of a dish-shaped container containing the divided refractory bricks, thereby causing impacts from the upper to the lower portion of the bricks falling onto the bottom surface of the inclined dish-shaped container. This repeatedly applies instantaneous forces (loads of roughly the same magnitude) to the refractory bricks, peeling off and separating the slag adhering to the surface of the refractory bricks. In addition, the impact from the falling also acts as a treatment that makes the slag adhering to the surface easier to peel off. Since the load due to the dropping impact can be adjusted by the diameter of the dish-shaped container, an appropriate impact load can be applied stably and repeatedly. Therefore, it can be easily adjusted to an impact load that suppresses the breakage of bricks.

[0015] Thus, according to one aspect of the present invention, even if the hardness of the brick as the base material is lower than that of the adhering slag, it becomes possible to separate the slag from the refractory brick to be treated more efficiently.

Brief Description of the Drawings

[0016] [Figure 1] It is a diagram for explaining the processing flow of slag separation from a refractory according to an embodiment based on the present invention. [Figure 2] It is a top view seen from the direction of the rotation axis showing a dish-shaped container according to an embodiment based on the present invention. Seeing from the direction of the rotation axis is synonymous with a plan view. [Figure 3] It is a schematic side view showing an example of a slag separation device according to an embodiment based on the present invention. [Figure 4] It is a diagram showing the relationship between the number of partition plates and the residual rate of adhering slag. [Figure 5] It is a diagram showing the relationship between the inclination angle of the container and the residual rate of adhering slag. [Figure 6] It is a diagram showing the relationship between the inclination angle of the container and the yield of bricks.

Modes for Carrying Out the Invention

[0017] Next, embodiments of the present invention will be described. In the following embodiments, as the refractory brick to be treated, a refractory brick used as a top-ped brick or a converter brick will be assumed and described.

[0018] (Configuration) In this embodiment, the process of separating slag adhering to refractory bricks for recycling is performed in the following process steps. As shown in FIG. 1, the process steps include a crushing step 10A, a first screening step 10B, a quenching step 10C, and a second screening step 10D.

[0019] <Crushing step 10A> In the crushing step 10A, a process is performed to divide the refractory bricks to be processed into chunks of a size that allows the attached slag to be easily separated (processed). In the crushing step 10A of this example, an impact is applied to the splitting position of the refractory bricks to be processed, and the refractory bricks to be processed are separated into a plurality of chunks.

[0020] The crushed particle size of each chunk after separation is, for example, a size with a particle diameter of 20 mm or more and 50 mm or less. Here, the particle diameter in this embodiment is the equivalent circle diameter. For example, when the area in top view is converted into a circle, the refractory bricks to be processed are crushed and divided so that the diameter D falls within the range of 20 mm or more and 50 mm or less.

[0021] The crushing process is performed, for example, using a crusher such as a jaw crusher for separation. When using a jaw crusher, the particle size is adjusted by setting the opening width of the double blades.

[0022] <First screening step 10B> In the first screening step 10B, a screening process for particle size adjustment is performed on the crushed refractory bricks. In the first screening process, for example, a sieve with a mesh size of 20 mm is used, the crushed refractory bricks are put into the sieve, and the refractory bricks on the sieve are collected. In this example, the mesh size is 20 mm as an example, but different mesh sizes may also be used. Also, sieves with several types of mesh sizes may be used to perform the screening process simultaneously.

[0023] In this example, by the first screening step 10B, chunks with a particle size of 20 mm or more composed of the refractory bricks to be processed are sent to the next quenching step 10C. By the above process, the particle diameter (particle size) of the bricks to be quenched is defined as 20 mm to 50 mm.

[0024] In this case, if the particle size of the bricks to be scraped is 20 mm or less, the proportion of brick powder will increase, which may reduce the recycling yield.

[0025] On the other hand, if the brick particle size is too large, it becomes difficult to remove the slag from the brick, which may increase the slag residue rate after scraping. From this perspective, the upper limit for the particle size of refractory bricks to be scraped was set at 50 mm. Here, the higher the slag residue rate after scraping, the more likely slag components are to be mixed in as impurities during recycling.

[0026] <Scaling process 10C> In the surface preparation process 10C, a treatment is performed to remove slag adhering to the surface of the refractory bricks. In the surface preparation process 10C, the crushed refractory bricks are repeatedly subjected to similar impacts to separate the slag adhering to the surface of the refractory bricks from the bricks.

[0027] In this example, a rotating drum device, as shown in Figures 2 and 3, was used as a slag separation device to separate the slag adhering to the surface of refractory bricks from the bricks, with a pan-dish-shaped container 1 as the rotating body. The slag separation apparatus of this embodiment comprises a dish-shaped container 1 and a rotating mechanism 2 for axially rotating the dish-shaped container 1.

[0028] [Dish-shaped container 1] The dish-shaped container 1 is a container for holding refractory bricks Br to be scraped, as shown in Figure 2. The dish-shaped container 1 consists of a rotating cylindrical body in which the height of the outer peripheral wall 1B is lower than the diameter D. That is, the dish-shaped container 1 has a circular bottom surface 1A and an annular outer peripheral wall 1B that rises along the outer circumference of the bottom surface 1A.

[0029] A rotating cylindrical body in which the height of the outer wall 1B is lower than the diameter D refers to a state in which the area of ​​the base (diameter D) is larger than the area of ​​the outer wall 1B. As shown in Figure 3, this dish-shaped container 1 is used with the axis (rotation axis) set at the center P tilted at a predetermined angle θ with respect to the vertical. This tilt causes the base portion 1A to tilt. As a result, the refractory bricks Br that have moved relatively upward on the base portion 1A can be dropped downward along the base portion 1A. A rotating cylindrical body with a large base area (diameter D) is adopted in order to generate the impact force from this drop.

[0030] In this embodiment, the diameter D of the dish-shaped container 1 was set to a range of 2000 mm to 5000 mm. In this embodiment, this diameter D is the diameter inside the dish-shaped container 1, i.e., the diameter at the bottom surface 1A, as shown in Figure 2. Also, in this example, the height H of the outer wall 1B was set to 500 mm, as shown in Figure 3.

[0031] In this case, if the diameter D is less than 2000 mm, sufficient impact force may not be applied to the refractory bricks Br inside the dish-shaped container 1, and there is a risk that impurities may not be sufficiently removed from the bricks. Furthermore, if the diameter D exceeds 5000 mm, there is a concern that the drop height is too high, causing not only the surface of the bricks but also the bricks themselves to break from the impact, thus reducing the purity of the recovered material. Based on the above considerations, the diameter D of the dish-shaped container 1 should be set according to the degree of slag adhesion to the refractory bricks Br when they are placed in the dish-shaped container 1 and the strength of the refractory bricks Br being targeted. For example, the optimal range for the diameter D of the dish-shaped container 1 can be determined and used through brick drop experiments.

[0032] Furthermore, the rotation axis of the dish-shaped container 1 is tilted from the vertical, meaning the bottom surface 1A is tilted vertically relative to the horizontal. This allows the refractory bricks Br, which move relatively upward as the dish-shaped container 1 rotates, to fall downward.

[0033] The inclination angle θ of the dish-shaped container 1, that is, the inclination angle θ of the bottom surface 1A, is set to an angle that allows the refractory bricks Br, which have moved relatively upward as the dish-shaped container 1 rotates, to fall along the upper surface of the bottom surface 1A. The inclination angle θ is preferably in the range of 25 degrees to 70 degrees, for example, when the horizontal position is set to 0 degrees. As will be described later, by setting the inclination angle θ, the refractory bricks Br that have moved upward can fall downward, and the residual slag rate can be reliably reduced.

[0034] [Partition plate 3] Furthermore, in this embodiment, as shown in Figures 2 and 3, two or more partition plates 3 are provided inside the dish-shaped container 1. Figures 2 and 3 illustrate the case where four partition plates 3 (in four locations) are provided.

[0035] Each partition plate 3 is positioned to extend in a direction intersecting the circumferential direction (rotational direction) of the dish-shaped container 1, and the partition plates 3 are spaced apart from each other along the circumferential direction of the dish-shaped container 1.

[0036] In this example, each partition plate 3 is positioned to extend radially from the drum wall towards the center of the container 1. The orientation of the partition plates 3 may also be such that they extend in a direction inclined from the radial direction to the circumferential direction of the container 1. Furthermore, the partition plates 3 were arranged at equal intervals. When there were two partition plates 3, they were arranged at 180-degree intervals. The partition plates 3 are preferably installed in 2 to 8 locations.

[0037] In this example, the height of partition plate 3 was set to 400 mm. The height H1 of partition plate 3 should preferably be lower than the drum height to prevent the bricks from spilling out of the container. However, a height of 300 mm or more is preferable to allow a certain amount of bricks to be lifted to the required height.

[0038] As the container rotates, the bricks moving circumferentially are gathered on the upstream side of the partition plate 3, as shown in Figure 2. The partition plate 3 also lifts a certain amount of bricks in front of it to the upper part of the bottom surface 1A as the container rotates. The resulting mass of bricks then easily falls downward along the upper surface of the bottom surface 1A. For this reason, it is preferable to install partition plates 3 in at least two locations.

[0039] In this example, the partition plate 3 is erected from the bottom surface of the dish-shaped container 1, and one end in the direction of extension is connected to the outer periphery wall 1B of the dish-shaped container 1. The other end of the partition plate 3 in the direction of extension is located at a predetermined distance L from the center P of the bottom surface in a plan view. The distance L is, for example, between 1 / 10 and 1 / 4 of the diameter D of the dish-shaped container. That is, the distance L is, for example, 1 / 5 to 1 / 2 of the radius (D / 2).

[0040] This increases the distance the bricks Br lifted upward by the partition plate 3 fall, and also reduces the variation in the impact force applied to each brick Br due to the fall. For example, consider the case where the other end of the partition plate 3 in the extending direction extends to near the center P of the bottom plate portion 1A. In this case, among the group of bricks lifted upward by the partition plate 3, the impact of the bricks that fall towards the bricks located on the side of the rotation center P is smaller than the impact of the bricks located on the side of the outer peripheral wall 1B. This causes variation in the impact of the bricks that fall. Conversely, the shorter the width of the partition plate 3 in the extending direction from the outer peripheral wall 1B, the less variation in the impact of the bricks that fall, while still generating impact force. However, the shorter the width of the partition plate 3 from the outer peripheral wall 1B, the smaller the group of bricks Br that are lifted upward by the partition plate 3 becomes, and the efficiency of separation decreases. From this viewpoint, the separation distance L was set to, for example, a distance of 1 / 10 to 1 / 4 of the diameter D of the dish-shaped container.

[0041] [Rotation mechanism 2] The rotating mechanism 2 is, for example, equipped with a motor as a rotational drive device, and is a device that rotates the dish-shaped container 1 on an axis, with the rotation axis of the dish-shaped container 1 being an inclined axis that is tilted from the vertical axis. The rotation axis may be eccentric from the center P of the dish-shaped container 1, as long as it is possible to lift and drop the brick as described above.

[0042] The rotation speed is set to, for example, 2 rpm. There are no particular limitations on the rotation speed, but for example, it should be between 1 rpm and 10 rpm. If the rotation speed is too slow, the time interval between repeated impacts will be too long, and the separation process will take too long. On the other hand, if the rotation speed is too high, the centrifugal force on the bricks will be too large, which may make it difficult for the bricks to fall. In other words, if it is below 1 rpm, the processing time will be too long and inefficient. On the other hand, if it exceeds 10 rpm, too much centrifugal force will be applied to the bricks, which may cause significant spillage outside the container during rotation and reduce the yield. From this perspective, the rotation speed should be in the range of, for example, 1 rpm to 10 rpm.

[0043] [Second sieving process 10D] In the second sieving step 10D, after the surface preparation, the refractory bricks Br and slag in the rotating container are collected and sieved, and the refractory bricks Br on the sieve are collected. In other words, the second sieving step 10D is a process to separate the bricks and slag after surface preparation. For the second sieving process, for example, a sieve with a mesh size of 20 mm is used. Then, the refractory bricks Br separated in the second sieving process 10D are used as recycled raw materials.

[0044] (Operation and other functions) In this embodiment, the refractory bricks Br to be processed are crushed into sizes that are easy to process in the crushing step 10A. Then, by repeatedly applying the same degree of impact to each crushed and divided refractory brick Br, the slag on the surface is scraped off, and the slag adhering to the refractory surface is removed. In other words, the slag that was attached to the refractory brick Br being treated can be separated.

[0045] In this example, by using a dish-shaped container 1 with an inclined axis of rotation as a rotating cylindrical body, it is possible to repeatedly apply a stable and appropriate impact to the bricks.

[0046] As described above, even if the base material brick has a lower hardness than the attached slag, it becomes possible to more efficiently separate the slag from the refractory brick Br to be processed. Furthermore, in this embodiment, it is possible to propose an efficient separation method for removing slag from the surface of refractory brick Br generated in the recycling process of refractory brick Br, and to provide an efficient method for recycling refractories.

[0047] (others) This disclosure may also take the following form: (1) A slag separation method for separating the slag from a refractory brick to be treated, which is a refractory brick with slag adhering to its surface, The refractory bricks to be processed above are divided into multiple blocks, By applying a load caused by impact to the divided refractory bricks to be processed, the slag is separated from the refractory bricks to be processed. Slag separation method. (2) The separation of the slag is carried out by placing the divided refractory bricks to be processed into a dish-shaped container made of a rotating cylindrical body in which the height of the outer wall is low relative to the diameter, and rotating the dish-shaped container with an axis tilted from the vertical axis as the axis of rotation. (3) The above-mentioned dish-shaped container has a diameter of 2000 mm or more and 5000 mm or less. (4) The dish-shaped container has two or more partition plates installed inside it, each extending in a direction that intersects the circumferential direction of the dish-shaped container, and spaced apart from each other in the circumferential direction. (5) The partition plate is erected from the bottom surface of the dish-shaped container, with one end in the direction of extension connected to the outer wall of the dish-shaped container, and the other end in the direction of extension separated from the center of the bottom surface by a distance of 1 / 10 to 1 / 4 of the diameter of the dish-shaped container in a plan view. (6) The inclination angle of the rotation axis from the vertical was set to an angle in the range of 25 degrees to 70 degrees. (7) The particle size of the bricks to be placed in the dish-shaped container shall be in the range of 20 mm to 50 mm. (8) The slag separation method of this disclosure separates slag from refractory bricks to which slag has adhered on the surface, and reuses the refractory bricks after separation. Methods for recycling refractory bricks. (9) A slag separation device used to separate the slag from a refractory brick to be treated, which is a refractory brick with slag adhering to its surface, A dish-shaped container consisting of a rotating cylindrical body in which the height of the outer wall is low relative to the diameter, for containing bricks, The above dish-shaped container is rotated using a rotation axis that is inclined from the vertical axis, and Equipped with, The above dish-shaped containers have a diameter in the range of 2000 mm to 5000 mm. The inclination angle of the rotation axis from the vertical was set to an angle in the range of 25 degrees to 70 degrees. Slag separation device. (10) The dish-shaped container has one or more partition plates installed inside it that extend in a direction intersecting the circumferential direction of the dish-shaped container. [Examples]

[0048] Experiments were conducted on the slag separation apparatus based on this embodiment. (Example 1) In Example 1, a dish-shaped container 1 with a diameter of D3000 mm was used. The dish-shaped container 1 was rotated at a speed of 2 rpm. In this example, the tilt angle θ of the dish-shaped container 1 was set to 35 degrees. The processing time was set to 3 minutes.

[0049] Under the above conditions, an experiment was conducted to determine the relationship between the number of partition plates 3 and the residual slag rate, yielding the results shown in Figure 4. The placement of the partition plates 3 was determined so that the spacing between each partition plate 3 was equal. In addition, the width of the partition plate 3 (extension length in the radial direction of the container) was set to 1 / 4 of the diameter D of the dish-shaped container 1.

[0050] As can be seen from Figure 4, it was found that the number of partition plates 3 is preferably in the range of 2 to 8. Here, "adhered slag residue rate" refers to the percentage of slag remaining on the bricks that were separated by the slag separation device and recovered in the second sieving process 10D, relative to the slag before treatment.

[0051] (Example 2) In Example 2, the effect of the tilt angle θ was investigated. In Example 2, the experiment was conducted under the same conditions as in Example 1, except that four partition plates 3 were used and the inclination angle was changed.

[0052] Figure 5 shows the relationship between the tilt angle θ of the dish-shaped container 1 and the residual slag rate. As shown in Figure 5, it was found that setting the inclination angle θ to 25 or greater (with the horizontal position being 0 degrees) reduces the slag residue rate.

[0053] Furthermore, under the same conditions, the relationship between the inclination angle θ of the dish-shaped container 1 and the brick yield was investigated. The results are shown in Figure 6. As can be seen in Figure 6, the yield decreased sharply when the inclination angle θ exceeded 70 degrees. Therefore, it was found that using the bricks at inclination angles θ exceeding 70 degrees is undesirable. Also, although the yield was high at angles less than 25 degrees, as shown in Figure 5, the slag residue rate was high. Therefore, to ensure high-purity bricks, an installation angle range of 25 to 70 degrees is considered appropriate.

[0054] (Example 3) In Example 3, a dish-shaped container 1 with a diameter of D3000 mm and a height of 500 mm was used for the scraping process. The container was rotated at a speed of 2 rpm, and the process was carried out for only 3 minutes.

[0055] Then, as shown in Table 1, the conditions were changed and the slag residue rate and amount of material treated after surface preparation were investigated when refractory bricks Br were treated. The results are shown in Table 1. Here, as a comparative example, the slag residue rate, processing amount, and slag residue rate when no surface preparation treatment is performed are shown for methods other than those of the present invention. In the drum rotation type surface preparation method used in the comparative example, the results are described for surface preparation treatment performed at a rotation speed of 20 rpm using a cylindrical drum rotation device with a diameter of D500 mm and a length of 3000 mm.

[0056] [Table 1]

[0057] As shown in Table 1, it was found that by performing the treatment based on the present invention, the slag residue rate can be significantly reduced, and the processing volume can be increased with high efficiency. [Explanation of Symbols]

[0058] 1 Dish-shaped container 1A Bottom part 1B Outer wall 2 Rotation mechanism 3 partition plates 10A Crushing process 10B First sieving process 10C Surface preparation process 10D Second sieving process Refractory bricks D. Diameter of the container P center θ Tilt angle

Claims

1. A slag separation method for separating the slag from a refractory brick to be treated, which is a refractory brick with slag adhering to its surface, The refractory bricks to be processed above are divided into multiple blocks, By applying a load caused by impact to the divided refractory bricks to be processed, the slag is separated from the refractory bricks to be processed. The separation of the slag described above is carried out by placing the divided refractory bricks to be processed into a dish-shaped container consisting of a rotating cylindrical body with a lower outer wall height relative to its diameter, and rotating the dish-shaped container around an axis tilted from the vertical axis. The above-mentioned dish-shaped container has two or more partition plates installed inside the container, each extending in a direction intersecting the circumferential direction of the dish-shaped container and spaced apart from the others in the circumferential direction. The above-mentioned partition plate is erected from the bottom surface of the dish-shaped container, with one end in the direction of extension connected to the outer wall of the dish-shaped container, and the other end in the direction of extension separated from the center of the bottom surface by a distance of 1 / 10 to 1 / 4 of the diameter of the dish-shaped container in a plan view. Slag separation method.

2. The above dish-shaped container has a diameter of 2000 mm or more and 5000 mm or less. The slag separation method described in claim 1.

3. The inclination angle of the rotation axis from the vertical was set to an angle in the range of 25 degrees to 70 degrees. The slag separation method described in claim 1.

4. The particle size of the bricks to be placed in the above dish-shaped container shall be in the range of 20 mm to 50 mm. The slag separation method described in claim 1.

5. The slag separation method described in any one of claims 1 to 4 separates the slag from refractory bricks to which slag has adhered on the surface, and reuses the refractory bricks after separation. Methods for recycling refractory bricks.

6. A slag separation device used to separate the slag from refractory bricks to be treated, which are refractory bricks with slag adhering to their surface, A dish-shaped container consisting of a rotating cylindrical body in which the height of the outer wall is low relative to the diameter, for containing bricks, The above dish-shaped container is rotated using a rotation axis that is inclined from the vertical axis, and Equipped with, The above dish-shaped containers have a diameter in the range of 2000 mm to 5000 mm. The inclination angle of the above rotation axis from the vertical is set to an angle in the range of 25 degrees to 70 degrees. The above-mentioned dish-shaped container has two or more partition plates installed inside the container, each extending in a direction intersecting the circumferential direction of the dish-shaped container and spaced apart from the others in the circumferential direction. The above-mentioned partition plate is erected from the bottom surface of the dish-shaped container, with one end in the direction of extension connected to the outer wall of the dish-shaped container, and the other end in the direction of extension separated from the center of the bottom surface by a distance of 1 / 10 to 1 / 4 of the diameter of the dish-shaped container in a plan view. Slag separation device.

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