Slag separation method, refractory brick recycling method and 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 a refractory brick to be treated, such as a used refractory brick, from the brick, in order to reuse the refractory brick or the like. [Background technology]

[0002] In recent years, in order to increase the recycling efficiency in steel plants where the pig iron making process is carried out, it has been proposed to reuse refractory bricks used in the pig iron making process.

[0003] Refractory bricks are used as torpedo bricks, converter bricks, etc., and are heat-storing bricks that can withstand high temperatures exceeding 1000°C. Generally, a slag layer is formed on the working surface of a refractory brick (the surface that comes into contact with molten steel and slag) as iron and slag adhere through the pores in the refractory brick. Mortar may also be partially attached to the other surfaces of the refractory brick.

[0004] When reusing refractory bricks, if slag or other contaminants are mixed into the bricks, their durability as refractory bricks will be significantly reduced and they will no longer be usable. For this reason, it is necessary to remove the slag or other contaminants from the bricks to be recycled.

[0005] Currently, slag and other substances adhering to the surface of each refractory brick are removed by manual striking, and the refractory brick itself is then crushed to produce brick material for recycling. However, this method is labor-intensive, and only a portion of the refractory bricks is reused. In other words, the conventional manual scraping work is not satisfactory in terms of work efficiency and running costs.

[0006] For these reasons, in order to efficiently recycle refractory bricks, it is necessary to automate the separation of the adhering slag from the refractory bricks and to make it possible to do so in large quantities. In response to this, devices have been proposed that can automatically scrape (remove) cement, mortar, paint, etc. adhering to the surface of metal workpieces, such as a drum-type scraping device described in Patent Document 1 and a water jet scraping device described in Patent Document 2. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2020-131400 A [Patent Document 2] JP 2001-9390 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, the above-mentioned conventional techniques have the following problems. It is desirable to scrape off as much of the slag adhering to the surface of the base material as possible. However, the hardness of the refractory brick is about 9.6 MPa, while the hardness of the adhering slag is about 14.0 MPa, meaning that the hardness of the base material, the brick, is lower than that of the adhering slag. The inventors have found that simply using the scraping device disclosed in Patent Document 1 or 2 can easily result in more scraping than necessary, which can reduce the yield of bricks. That is, when refractory bricks are treated with the scraping device disclosed in Patent Document 1 or 2, the refractory bricks are scraped off significantly, which reduces the recycling yield, because the bricks, which are the base material, are lower in hardness than the adhering slag.

[0009] The present invention has been made in view of the above-mentioned points, and has an object to make it possible to more efficiently separate slag from the refractory bricks being treated. [Means for solving the problem]

[0010] After various studies, the inventors came up with the idea of ​​applying instantaneous force to the bricks, which are the base material, in order to make the surface-adhering slag easier to peel off, taking into consideration that the bricks are lower in hardness than the adhering slag. They then came to the conclusion that by applying instantaneous force to peel off and separate the surface-adhering slag from the bricks, it is possible to efficiently separate the adhering slag while suppressing a decrease in the brick recycling yield, even if the base material brick is lower in hardness than the adhering slag.

[0011] In order to solve the problem, one aspect of the present invention is a slag separation method for separating slag from a target refractory brick, which is a refractory brick having slag adhering to its surface, by dividing the target refractory brick into multiple blocks and applying a load by dropping impact to the divided target refractory brick, thereby separating the slag from the target refractory brick.

[0012] Slag separation is carried out, for example, by placing the divided refractory bricks to be treated in a dish-shaped container consisting of a rotating cylinder whose outer wall is low in height compared to its diameter, and rotating the dish-shaped container on an axis inclined from the vertical axis. Effect of the Invention

[0013] According to one aspect of the present invention, the refractory brick to be treated is divided into a plurality of blocks as a pretreatment, so that the slag adhering to the surface can be easily peeled off. Then, the divided refractory bricks to be treated are subjected to an instantaneous force by dropping, so that the slag adhering to the surface is peeled off and separated from the refractory bricks.

[0014] The slag is separated, for example, by rotating a dish-shaped container containing divided refractory bricks with its axis of rotation tilted, causing the slag to fall from the upper part to the lower part of the bottom surface of the tilted dish-shaped container. This repeatedly applies instantaneous forces (loads of approximately the same magnitude) to the refractory bricks, peeling off and separating the slag adhering to the surface from the refractory bricks. The collision caused by the fall also serves as a process to make the slag adhering to the surface easier to peel off. The load of the drop impact can be adjusted by the diameter of the dish-shaped container, so that an appropriate impact load can be applied stably and repeatedly. Therefore, the impact load can be easily adjusted to prevent damage to the bricks.

[0015] Thus, according to one aspect of the present invention, even if the base brick has a lower hardness than the adhering slag, it is possible to more efficiently separate the slag from the refractory brick being treated. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a diagram illustrating a process flow for separating slag from a refractory material according to an embodiment of the present invention. [Diagram 2] 1 is a top view showing a dish-shaped container according to an embodiment of the present invention, as viewed from a rotation axis direction. [Diagram 3] 1 is a schematic side view showing an example of a slag separation device according to an embodiment of the present invention. [Figure 4] FIG. 13 is a diagram showing the relationship between the number of partition plates and the rate of adhered slag remaining. [Diagram 5] FIG. 13 is a diagram showing the relationship between the inclination angle of the container and the rate of adhered slag remaining. [Figure 6] FIG. 13 is a diagram showing the relationship between the inclination angle of the container and the yield of bricks. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Next, an embodiment of the present invention will be described. In the following embodiment, the refractory bricks to be treated are assumed to be refractory bricks used as torpedo bricks or converter bricks.

[0018] (composition) In this embodiment, the process of separating the slag adhering to the refractory bricks for recycling is carried out in the following process steps, which include a crushing step 10A, a first sieving step 10B, a scraping step 10C, and a second sieving step 10D, as shown in FIG.

[0019] <Crushing process 10A> In the crushing step 10A, the refractory brick to be treated is divided into chunks of a size that allows easy separation (treatment) of the adhering slag. In the crushing step 10A of this example, an impact is applied to the division position of the refractory brick to be treated, and the refractory brick to be treated is divided into a plurality of chunks.

[0020] The crushed particle size of each lump after separation is, for example, 20 mm to 50 mm. Here, the particle size in this embodiment is the circle equivalent diameter. For example, when the area in top view is converted into a circle, the diameter D is adjusted to be 20 mm to 50 mm, and the refractory brick to be treated is crushed and divided.

[0021] The crushing process is carried out by, for example, using a crushing machine such as a jaw crusher. When using a jaw crusher, the particle size is adjusted by setting the opening of both blades.

[0022] <First sieving process 10B> In the first sieving process 10B, the crushed refractory bricks are sieved to adjust the particle size. In the first sieving process, for example, a sieve with a mesh size of 20 mm is used, and 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 the mesh size may be different. Also, the sieve process may be performed simultaneously using sieves with several different mesh sizes.

[0023] In this example, the first sieving step 10B sends lumps of refractory bricks to be treated, which have a grain size of 20 mm or more, to the subsequent scraping step 10C. Through the above process, the particle size (grain size) of the bricks to be scraped is regulated to 20mm to 50mm.

[0024] Here, if the particle size of the bricks to be scraped is 20 mm or less, the proportion of brick powder will increase, which may result in a decrease in the recycling yield.

[0025] On the other hand, if the grain size of the bricks is too large, the slag will be difficult to remove from the bricks, and there is a risk that the slag residue rate after scraping will increase. From this perspective, the upper limit of the grain size of the refractory bricks to be scraped is set at 50 mm. Here, the higher the slag residue rate after scraping, the more likely it is that slag components will be mixed in as impurities during recycling.

[0026] <Scraping process 10C> In the scraping step 10C, a treatment is carried out to remove slag adhering to the surface of the refractory bricks. In the scraping step 10C, the crushed refractory bricks are repeatedly subjected to the same degree of drop impact to separate the slag adhering to the surfaces of the refractory bricks from the bricks.

[0027] In this example, a rotating drum device with a bread-dish shaped dish-shaped container 1 as a rotating body, as shown in Figures 2 and 3, was used as a slag separation device for separating the slag adhering to the surface of the refractory bricks from the bricks. The slag separation device of this embodiment includes a dish-shaped container 1 and a rotation mechanism 2 that rotates the dish-shaped container 1 about its axis.

[0028] [Dish-shaped container 1] The dish-shaped vessel 1 is a vessel for containing refractory bricks Br to be scraped, as shown in Fig. 2. The dish-shaped vessel 1 is a rotating cylinder whose outer peripheral wall 1B has a low height relative to its diameter D. That is, the dish-shaped vessel 1 has a circular bottom portion 1A and an annular outer peripheral wall 1B that rises along the outer periphery of the bottom portion 1A.

[0029] A rotating cylinder with an outer peripheral wall 1B having a low height relative to its diameter D refers to a state in which the area of ​​the bottom surface (diameter D) is large relative to the outer peripheral wall 1B. As shown in FIG. 3, this dish-shaped container 1 is used with its axis (rotation axis) set at the center P tilted at a predetermined angle θ with respect to the vertical. This tilt causes the bottom surface 1A to tilt. Therefore, the refractory bricks Br that move relatively upward on the bottom surface 1A can be allowed to fall downward along the bottom surface 1A. In order to absorb the impact force caused by this fall, a rotating cylinder with a large area of ​​the bottom surface (diameter D) is adopted.

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

[0031] Here, if the diameter D is less than 2000 mm, the drop impact applied to the refractory bricks Br in the dish-shaped vessel 1 may not be sufficient, and impurities may not be sufficiently removed from the bricks. Furthermore, if the diameter D exceeds 5000 mm, the drop height is too high and not only the brick surface but also the brick itself may be destroyed by the impact of the drop, resulting in a decrease in the purity of the recovered material. Based on the above considerations, the diameter D of the dish-shaped container 1 may be set according to the degree of adhesion of the slag to the refractory bricks Br when they are fed into the dish-shaped container 1 and the strength of the target refractory bricks Br. For example, the optimum range of the diameter D of the dish-shaped container 1 may be determined by a brick drop experiment or the like and then used.

[0032] In addition, the rotation axis of the dish-shaped container 1 is tilted from the vertical direction, i.e., the bottom surface 1A is tilted up and down with respect to the horizontal. This allows the refractory bricks Br that move relatively upward as the dish-shaped container 1 rotates to fall downward.

[0033] The inclination angle θ of the dish-shaped vessel 1, i.e., the inclination angle θ of the bottom surface portion 1A, is set to an angle at which the refractory bricks Br that move relatively upward as the dish-shaped vessel 1 rotates can fall along the upper surface of the bottom surface portion 1A. For example, the inclination angle θ is preferably in the range of 25 degrees to 70 degrees, assuming that the horizontal position is 0 degrees. As described later, by setting the inclination angle θ at this value, the refractory bricks Br that move upward can fall downward, and the residual rate of slag can be reliably reduced.

[0034] [Partition 3] In this embodiment, as shown in Figures 2 and 3, two or more partition plates 3 are provided in the dish-shaped container 1. Figures 2 and 3 show an example in which four partition plates 3 are provided (in four locations).

[0035] Each partition plate 3 was disposed so as to extend in a direction intersecting the circumferential direction (rotation direction) of the dish-shaped container 1, and the partition plates 3 were installed apart from each other along the circumferential direction of the dish-shaped container 1.

[0036] In this embodiment, each partition plate 3 is disposed so as to extend from the drum wall surface toward the center of the container 1, that is, so as to extend in the radial direction. The partition plates 3 may extend in a direction inclined from the radial direction of the container 1 to the circumferential direction. Moreover, the partition plates 3 are disposed at equal intervals. When there are two partition plates 3, they are disposed at intervals of 180 degrees. The number of locations where the partition plates 3 are provided is preferably 2 to 8.

[0037] In this example, the height of the partition plate 3 is 400 mm. The height H1 of the partition plate 3 is preferably lower than the drum height so that the bricks do not fly out of the container. However, in order to lift a certain number of bricks to a predetermined height, it is preferable that the height be 300 mm or more.

[0038] The partition plate 3 causes the bricks that move in the circumferential direction as the container rotates to gather on the surface of the partition plate 3 that is upstream in the rotation direction, as shown in Figure 2. As the container rotates, the partition plate 3 lifts a certain number of bricks up to the upper part of the bottom part 1A in front of the partition plate 3. The group of bricks that have moved upwards then tends to fall downward along the upper surface of the bottom part 1A. For this reason, it is preferable to install the partition plates 3 in at least two locations.

[0039] In this example, the partition plate 3 stands upright from the bottom surface of the dish-shaped container 1, and one end side in the extending direction is connected to the outer peripheral wall 1B of the dish-shaped container 1. The other end position in the extending direction of the partition plate 3 is separated by a predetermined distance L from the center P of the bottom surface in a plan view. The separation distance L is, for example, 1 / 10 to 1 / 4 of the diameter D of the dish-shaped container. In other words, the separation distance L is, for example, 1 / 5 to 1 / 2 of the radius (D / 2).

[0040] This increases the falling distance of the group of bricks Br lifted upward by the partition plate 3, and also suppresses the variation in the impact force caused by the fall on each brick Br. For example, consider a case where the other end position in the extension direction of the partition plate 3 is extended to the vicinity of the position of the center P of the bottom plate portion 1A. In this case, the drop impact on the bricks located on the rotation center P side among the group of bricks lifted upward by the partition plate 3 is smaller than the drop impact on the bricks located on the outer peripheral wall 1B side. This causes variation in the drop impact. In contrast, the shorter the width of the partition plate 3 in the extension direction from the outer peripheral wall 1B, the greater the impact force and the smaller the variation in the drop impact. However, the shorter the width of the partition plate 3 from the outer peripheral wall 1B, the smaller the group of bricks Br lifted upward by the partition plate 3, and the lower the efficiency of separation. From this point of view, the separation distance L is, for example, 1 / 10 to 1 / 4 of the diameter D of the dish-shaped container.

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

[0042] The rotation speed is set to, for example, 2 rpm. The rotation speed is not particularly limited, but may be, for example, 1 rpm to 10 rpm. If the rotation speed is too slow, the time interval between repeated drop impacts becomes large, and the separation process takes too long. On the other hand, if the rotation speed is too high, the centrifugal force acting on the bricks becomes large, and the bricks may not easily fall. That is, if the rotation speed is 1 rpm or less, the process takes too long and is inefficient. On the other hand, if the rotation speed exceeds 10 rpm, the centrifugal force acting on the bricks becomes too strong, and there is a risk of significant spillage outside the container during rotation, resulting in a decrease in yield. From this viewpoint, the rotation speed is set to, for example, a range of 1 rpm to 10 rpm.

[0043] [Second sieving process 10D] In the second sieving process 10D, after the scraping process, the refractory bricks Br and slag in the rotating container are collected and sieved, and the refractory bricks Br on the sieve are collected. That is, in the second sieving process 10D, the bricks and slag after scraping are separated. In the second sieving process, for example, a sieve with a mesh size of 20 mm is used. The refractory bricks Br separated in the second sieving process 10D are used as a recycled material.

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

[0045] In this example, the dish-shaped container 1 with an inclined axis of rotation is used as a rotating cylinder, so that a stable and appropriate drop impact can be repeatedly applied to the bricks.

[0046] As a result, even if the base brick has a lower hardness than the adhering slag, it is possible to more efficiently separate the slag from the refractory brick Br to be treated. In this embodiment, an efficient separation method for removing the slag from the surface of the refractory brick Br generated in the recycling process of the refractory brick Br can be proposed, and an efficient refractory recycling method can be provided.

[0047] (others) The present disclosure may also have the following configuration. (1) A slag separation method for separating slag from a refractory brick to be treated, the refractory brick being a refractory brick having slag adhering to its surface, comprising the steps of: Dividing the refractory brick to be treated into a plurality of blocks; applying a load by dropping impact to the divided refractory bricks to be treated, thereby separating the slag from the refractory bricks to be treated; Slag separation method. (2) The slag is separated by placing the divided refractory bricks to be treated in a dish-shaped container consisting of a rotating cylinder whose outer wall is low in height compared to its diameter, and rotating the dish-shaped container around an axis inclined from the vertical axis. (3) The above-mentioned dish-shaped container has a diameter of 2000 mm or more and 5000 mm or less. (4) The above-mentioned dish-shaped container has partition plates disposed within the container in two or more locations, spaced apart from each other in the circumferential direction, extending in a direction intersecting the circumferential direction of the dish-shaped container. (5) The partition plate is erected from the bottom surface of the dish-shaped container, with one end side in the extending direction connected to the outer wall of the dish-shaped container, and the other end side in the extending direction spaced apart from the center of the bottom surface by a distance of at least 1 / 10 and at most 1 / 4 of the diameter of the dish-shaped container when viewed in a plane. (6) The inclination angle of the rotation axis from the vertical direction is set to a range of 25 degrees or more and 70 degrees or less. (7) The particle size of the bricks placed in the dish-shaped container shall be in the range of 20 mm or more and 50 mm or less. (8) Separating slag from refractory bricks having slag attached to their surfaces by the slag separation method of the present disclosure, and reusing the refractory bricks after separation; How to recycle refractory bricks. (9) A slag separating device used for separating slag from a refractory brick to be treated, the refractory brick being a refractory brick having slag adhering to its surface, comprising: A dish-shaped container made of a rotating cylinder having an outer wall with a low height relative to its diameter, which contains the bricks; A rotation mechanism that rotates the dish-shaped container about an axis inclined from a vertical axis; Equipped with The above dish-shaped container has a diameter in the range of 2000mm to 5000mm. The inclination angle of the rotation axis from the vertical direction is set to an angle in the range of 25 degrees to 70 degrees. Slag separator. (10) The above-mentioned dish-shaped container has one or more partition plates installed within the container extending in a direction intersecting the circumferential direction of the dish-shaped container. EXAMPLES

[0048] An experiment was carried out on the slag separation device based on this embodiment. Example 1 In Example 1, a dish-shaped container 1 having a diameter D of 3000 mm was used. The dish-shaped container 1 was rotated at a rotation speed of 2 rpm. In this example, the inclination angle θ of the dish-shaped container 1 was set to 35 degrees. The treatment time was set to 3 minutes.

[0049] Under the above conditions, an experiment was conducted on the relationship between the number of partition plates 3 and the rate of adhering slag remaining, and the results shown in Figure 4 were obtained. The locations of the partition plates 3 were determined so that the intervals between each partition plate 3 were equal. The width of the partition plate 3 (extending 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 FIG. 4, it was found that the number of partition plates 3 is preferably in the range of 2 to 8. Here, the "adhered slag residual rate" refers to the rate of remaining slag adhering to the bricks separated by the slag separator and recovered in the second sieving step 10D, relative to the amount of slag remaining before treatment.

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

[0052] The relationship between the inclination angle θ of the dish-shaped container 1 and the adhesion slag residual rate is shown in FIG. As shown in FIG. 5, it was clear that the slag residual rate was reduced by setting the inclination angle θ to 25° or more, assuming that the horizontal position is 0°.

[0053] Under the same conditions, the relationship between the inclination angle θ of the dish-shaped container 1 and the brick yield was also investigated. The results are shown in FIG. As can be seen from Figure 6, when the inclination angle θ exceeded 70 degrees, the yield dropped sharply. For this reason, it was found that use at an inclination angle θ exceeding 70 degrees is undesirable. In addition, the yield was high at an angle of less than 25 degrees, but as shown in Figure 5, the residual slag rate was high. Therefore, in order to ensure high-purity bricks, an installation angle in the range of 25 degrees to 70 degrees is appropriate.

[0054] Example 3 In Example 3, scraping treatment was carried out using a dish-shaped vessel 1 having a diameter D of 3000 mm and a height of 500 mm. The vessel was rotated at a speed of 2 rpm, and treatment was carried out for only 3 minutes.

[0055] The slag residual rate and processing amount after scraping treatment when refractory bricks Br were treated were investigated by changing the conditions as shown in Table 1. The results are shown in Table 1. Here, as comparative examples, the slag residual rate, processing amount, and slag residual rate in a method other than the present invention are shown, as well as the case where scraping treatment is not performed. Note that, in the drum rotation type scraping method used in the comparative examples, a cylindrical drum rotation type device with a diameter D of 500 mm and a length of 3000 mm was used, and the results of scraping treatment at a rotation speed of 20 rpm are shown.

[0056] [Table 1]

[0057] As shown in Table 1, by carrying out the treatment according to the present invention, it was found that the slag residue rate could be significantly reduced and the treatment amount could be treated with high efficiency. [Explanation of symbols]

[0058] 1 Dish-shaped container 1A Bottom part 1B Outer wall 2 Rotation mechanism 3 Partition 10A Crushing process 10B First sieving process 10C Cleaning process 10D Second sieving process Br Refractory bricks D Container diameter P center θ Tilt angle

Claims

1. A slag separation method for separating slag from a refractory brick to be treated, the refractory brick being a refractory brick having slag attached to its surface, comprising the steps of: Dividing the refractory brick to be treated into a plurality of blocks; applying a load by dropping impact to the divided refractory bricks to be treated, thereby separating the slag from the refractory bricks to be treated; Slag separation method.

2. The separation of the slag is carried out by placing the divided refractory bricks to be treated in a dish-shaped container made of a rotating cylinder having an outer wall with a low height relative to the diameter, and rotating the dish-shaped container around an axis inclined from the vertical axis.

2. The method for separating slag according to claim 1.

3. The dish-shaped container has a diameter of 2000 mm or more and 5000 mm or less.

3. A method for separating slag according to claim 2.

4. The dish-shaped container has partition plates extending in a direction intersecting the circumferential direction of the dish-shaped container, the partition plates being spaced apart from each other in the circumferential direction at two or more locations within the container.

3. A method for separating slag according to claim 2.

5. The partition plate is erected from the bottom surface of the dish-shaped container, and one end side in the extending direction is connected to the outer peripheral wall of the dish-shaped container, and the other end side in the extending direction is 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.

5. A method for separating slag according to claim 4.

6. The inclination angle of the rotation axis from the vertical direction is set to an angle in the range of 25 degrees to 70 degrees.

3. A method for separating slag according to claim 2.

7. The particle size of the bricks contained in the dish-shaped container is in the range of 20 mm to 50 mm.

3. A method for separating slag according to claim 2.

8. The slag is separated from the refractory bricks having slag attached to their surfaces by the slag separation method according to any one of claims 1 to 7, and the refractory bricks after separation are reused. How to recycle refractory bricks.

9. A slag separating apparatus for separating slag from a refractory brick to be treated, the refractory brick being a refractory brick having slag adhering to its surface, comprising: A dish-shaped container made of a rotating cylinder having an outer wall with a low height relative to its diameter, which contains the bricks; A rotation mechanism that rotates the dish-shaped container about an axis inclined from a vertical axis; Equipped with The above-mentioned dish-shaped container has a diameter in the range of 2000 mm or more and 5000 mm or less, The inclination angle of the rotation axis from the vertical direction is set to an angle in the range of 25 degrees to 70 degrees. Slag separator.

10. The dish-shaped container has one or more partition plates installed therein extending in a direction intersecting the circumferential direction of the dish-shaped container.

10. A slag separator according to claim 9.

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