Method for manufacturing refractory brick raw material, manufacturing equipment therefor, method for separating refractory brick surface slag, and separating equipment therefor

Abstract

To provide a manufacturing method of refractory brick raw material and manufacturing facilities thereof, as well as a separating method of refractory brick surface layer slag and a separating device thereof which separates surface layer-attached slag from refractory brick by applying an instantaneous force while making refractory brick surface-attached slag such a state that the slag comes off from refractory brick.SOLUTION: A manufacturing method of refractory brick raw material for recycling or a separation method of refractory brick includes a crushing process of crushing used refractory brick into predetermined particle sizes or less, a first sieving process of obtaining refractory brick having particle sizes of a predetermined range, a chaplet process of separating a surface layer slag from the refractory brick and a second sieving process of obtaining refractory brick raw material of particle size in a predetermined range. In the chaplet process, a rotary drum of a particle-rounding machine includes an inner drum having inner blades and an outer drum having outer blades, the inner drum and the outer drum rotate in directions reverse to each other and it is preferable that rotation number of the inner drum is more than rotation number of the outer drum.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a recycled refractory brick raw material for separating slag adhering to used refractory bricks, a manufacturing facility therefor, a method for separating a surface slag of a recycled refractory brick, and a separating facility therefor.

Background Art

[0002] In recent years, in order to improve the recycling efficiency in the milling process, especially in ironmaking, it has been proposed to reuse refractory bricks used in the milling process. Refractory bricks include top bricks, converter bricks, etc. Generally, on the operating surface (the surface in contact with molten steel or slag) side of refractory bricks, iron or slag adheres through pores in the refractory, and in some cases, mortar also adheres to other surfaces. When recycling refractory bricks, if these are mixed in, the durability as a refractory brick is significantly reduced and it becomes unusable, so it is necessary to remove them. Currently, only a part of the refractory bricks is recycled by manually separating the slag adhering to the surface of each refractory brick by impact and then crushing it. In order to efficiently recycle refractory bricks, it is necessary to enable automated and mass separation of the adhering slag from the refractory bricks.

[0003] Devices that can automatically remove (descale) cement, mortar, paint, etc. adhering to the surface of metal workpieces, such as the drum descaling device described in Patent Document 1 and the water jet descaling device described in Patent Document 2, have already been proposed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] The above prior art has the following problems. When separating the slag adhering to the surface of the refractory brick as described above, the hardness of the refractory brick is 9.6 MPa and the slag is 14.0 MPa. Thus, the hardness of the brick as the base material is lower than that of the adhering slag. Therefore, it is necessary to only peel the surface adhering slag, but if peeling is performed more than necessary, the yield of the brick will decrease. Thus, the peeling device disclosed in Patent Document 1 or 2 cannot be used as it is. Therefore, it is necessary to make the surface adhering slag easy to peel off, apply an instantaneous force, and peel and separate the surface adhering slag from the brick.

[0006] In addition, when performing the peeling operation manually in the conventional manner, it was not satisfactory in terms of work efficiency, running costs, etc. Further, when using the already proposed automatic peeling device, as described above, since the hardness of the brick as the base material is lower than that of the adhering slag, there was a problem that the refractory brick was greatly cut and the yield decreased.

[0007] The present invention has been made in view of the above circumstances, and aims to propose a method for separating surface-attached slag from a refractory brick, its separating equipment, a method for manufacturing a refractory brick raw material, and its manufacturing equipment, which enable the surface-attached slag to be easily peeled off, apply an instantaneous force, and peel and separate the surface-attached slag from the brick.

Means for Solving the Problems

[0008] The inventors conducted intensive experiments and studies to solve the above problems. As a result, they found that when sizing the refractory brick, by performing crushing in advance, the adhering slag can be easily peeled off, and by sizing after this crushing, the slag adhering to the refractory brick can be efficiently removed.

[0009] The manufacturing method of the refractory slag raw material according to the present invention that advantageously solves the above problems is configured as follows. [1] A method for manufacturing recycled refractory brick raw materials, comprising a crushing step of crushing used refractory bricks to a particle size of 50 mm or less, a first sieving step of sieving the refractory bricks crushed to the particle size of 50 mm or less to obtain refractory bricks having a particle size within a predetermined range, a keren step of separating surface slag from the refractory bricks having a particle size within the predetermined range, and a second sieving step of sieving the refractory bricks processed in the keren step to obtain refractory brick raw materials having a particle size within a predetermined range. [2] In the above [1], a crushing step of crushing used refractory bricks to a particle size of 50 mm or less, a first sieving step of sieving the refractory bricks crushed to a particle size of 50 mm or less to obtain refractory bricks having a particle size of 20 to 50 mm, a keren step of separating surface slag from the refractory bricks having a particle size of 20 to 50 mm, and a second sieving step of sieving the refractory bricks processed in the keren step to obtain refractory brick raw materials having a particle size of 20 to 40 mm. [3] In the above [2], in the crushing step, a method for manufacturing refractory brick raw materials by crushing refractory bricks to a particle size of 50 to 40 mm. [4] In the above [2] or [3], in the keren step, the rotating drum having a cylindrical shape extending along the axis has an inner drum and an outer drum whose rotation axis is eccentric. The inner blade provided on the outer peripheral surface of the inner drum and the outer blade provided on the inner peripheral surface of the outer drum are used to size the refractory bricks and separate surface slag from the refractory bricks. [5] In the above [4], the inner drum and the outer drum of the rotating drum rotate in opposite directions, and the rotation speed of the inner drum is 1.1 to 1.3 times the rotation speed of the outer drum. Here, the rotation speed refers to the number of rotations per unit time (Hz). [6] In the above [5], a method for manufacturing refractory brick raw materials in which the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

[0010] The manufacturing equipment for refractory brick raw materials according to the present invention that advantageously solves the above problems is configured as follows. [7] A crushing device that crushes used refractory bricks to a particle size of a predetermined size or less, a first sieving device that sieves the refractory bricks crushed to a particle size of a predetermined size or less to obtain refractory bricks having a particle size within a predetermined range, a keren device that separates surface slag from the refractory bricks having a particle size within the predetermined range, and a second sieving device that sieves the refractory bricks processed by the keren device to obtain refractory bricks having a particle size within a predetermined range. The keren device is a rotating drum having a cylindrical shape extending along an axis and including an inner drum and an outer drum whose rotation axis is eccentric. The keren device has an inner blade provided on the outer peripheral surface of the inner drum, an outer blade provided on the inner peripheral surface of the outer drum, and a mechanism in which the inner drum and the outer drum rotate in opposite directions and the rotation speed of the inner drum is higher than that of the outer drum. It is a manufacturing facility for refractory brick raw materials. [8] In the above [7], a crushing device that crushes used refractory bricks to a particle size of 50 mm or less, a first sieving device that sieves the refractory bricks crushed to a particle size of 50 mm or less to obtain refractory bricks having a particle size of 20 to 50 mm, a keren device that separates surface slag from the refractory bricks having a particle size of 20 to 50 mm, and a second sieving device that sieves the refractory bricks processed by the keren device to obtain refractory bricks having a particle size of 20 to 40 mm. The keren device is a rotating drum having a cylindrical shape extending along an axis and including an inner drum and an outer drum whose rotation axis is eccentric. The keren device has an inner blade provided on the outer peripheral surface of the inner drum, an outer blade provided on the inner peripheral surface of the outer drum, and a mechanism in which the inner drum and the outer drum rotate in opposite directions and the rotation speed of the inner drum is 1.1 to 1.3 times that of the outer drum. It is a manufacturing facility for refractory brick raw materials. [9] In the above [8], it is a manufacturing facility for refractory brick raw materials in which the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

[0011] The method for separating the surface slag of refractory bricks according to the present invention that advantageously solves the above problems is configured as follows.

[10] A method for separating surface slag from refractory bricks includes a crushing step of crushing used refractory bricks into a particle size below a predetermined size, a first sieving step of sieving the crushed refractory bricks with a particle size below the predetermined size to obtain refractory bricks with a particle size within a predetermined range, a keren step of separating surface slag from the refractory bricks with a particle size within the predetermined range, and a second sieving step of sieving the refractory bricks processed in the keren step to obtain a refractory brick raw material with a particle size within a predetermined range.

[11] In the above

[10] , a method for separating surface slag from refractory bricks includes a crushing step of crushing used refractory bricks into a particle size of 50 mm or less, a first sieving step of sieving the crushed refractory bricks with a particle size of 50 mm or less to obtain refractory bricks with a particle size of 20 - 50 mm, a keren step of separating surface slag from the refractory bricks with a particle size of 20 - 50 mm, and a second sieving step of sieving the refractory bricks processed in the keren step to obtain a refractory brick raw material with a particle size of 20 - 40 mm.

[12] In the above

[11] , in the crushing step, it is a method for separating surface slag from refractory bricks that crushes the refractory brick particle size to 50 - 40 mm.

[13] In the above

[11] or

[12] , in the keren step, the rotating drum having a cylindrical shape extending along the axis has an inner drum and an outer drum whose rotating shaft is eccentric. The inner blade provided on the outer peripheral surface of the inner drum and the outer blade provided on the inner peripheral surface of the outer drum shape the refractory bricks and separate surface slag from the refractory bricks.

[14] In the above

[13] , the inner drum and the outer drum of the rotating drum rotate in opposite directions, and the rotation speed of the inner drum is 1.1 - 1.3 times that of the outer drum. Here, the rotation speed refers to the number of rotations per unit time (Hz).

[15] In the above

[14] , it is a method for separating surface slag from refractory bricks where the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

[0012] The equipment for separating surface slag from refractory bricks according to the present invention that advantageously solves the above problems is configured as follows.

[16] A crushing device for crushing used refractory bricks to a particle size of a predetermined size or less, a first sieving device for sieving the refractory bricks crushed to the particle size of a predetermined size or less to obtain refractory bricks within a predetermined range, a keren device for separating surface slag from the refractory bricks within the predetermined range of particle sizes, and a second sieving device for sieving the refractory bricks processed by the keren device to obtain a refractory brick raw material within a predetermined range of particle sizes. The keren device is a rotating drum having a cylindrical shape extending along an axis and including an inner drum and an outer drum whose rotation axis is eccentric. The keren device has an inner blade provided on the outer peripheral surface of the inner drum, an outer blade provided on the inner peripheral surface of the outer drum, and a mechanism in which the inner drum and the outer drum rotate in opposite directions and the rotation speed of the inner drum is higher than the rotation speed of the outer drum. It is a separation facility for refractory brick surface slag.

[17] In the above

[16] , a crushing device for crushing used refractory bricks to a particle size of 50 mm or less, a first sieving device for sieving the refractory bricks crushed to a particle size of 50 mm or less to obtain refractory bricks with a particle size of 20 to 50 mm, a keren device for separating surface slag from the refractory bricks with a particle size of 20 to 50 mm, a second sieving device for sieving the refractory bricks processed by the keren device to obtain a refractory brick raw material with a particle size of 20 to 40 mm, and a mechanism in which the rotation speed of the inner drum is 1.1 to 1.3 times the rotation speed of the outer drum. It is a separation facility for refractory brick surface slag.

[18] In the above

[17] , it is a separation facility for refractory brick surface slag in which the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

Effect of the Invention

[0013] According to the present invention, by passing used refractory bricks through a crushing process, a sieving process, a sizing process (keren process), and a sieving process, slag adhering to the surface of the refractory bricks can be separated. As a result, the residual rate of slag on the surface of the refractory bricks can be 2.7% or less, and the yield of the refractory bricks can reach 70% or more, making it possible to produce high-quality and large quantities of recycled refractory brick raw materials.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0015] The method for implementing the present invention will be specifically described. It should be noted that the following description shows preferred embodiments of the present invention, and the present invention is not limited by the following description in any way. The manufacturing equipment and method of refractory brick raw materials for recycling, as well as the refractory brick surface slag separation method and separation equipment, which are one embodiment of the present invention, will be described together.

[0016] As shown in FIGS. 1 and 3, the manufacture of refractory brick raw materials for recycling and the separation of the surface slag of refractory bricks according to the embodiment of the present invention include the following steps (1) to (4). (1) Crushing step (2) First screening step (3) Quenching step (4) Second screening step

[0017] First, the manufacturing equipment for refractory brick raw materials and the separation equipment for the surface slag of refractory bricks, which are embodiments of the present invention, will be described in detail. <Manufacturing Equipment for Refractory Brick Raw Materials, Separation Equipment for Surface Slag of Refractory Bricks> As an example of this embodiment, Fig. 2 and Fig. 3 show the manufacturing equipment for recycled refractory brick raw materials and the separation equipment for the surface slag of refractory bricks. The manufacturing equipment and separation equipment of this embodiment include a crushing device that crushes used refractory bricks to a particle size below a predetermined value, a first screening device that screens the refractory bricks crushed to a particle size below a predetermined value to obtain refractory bricks within a predetermined range, a keren device that separates the surface slag from the refractory bricks within a predetermined range of particle sizes, and a second screening device that screens the refractory bricks processed by the keren device to obtain refractory brick raw materials within a predetermined range of particle sizes.

[0018] Crushing Device The crushing device crushes used refractory bricks using a crusher such as a jaw crusher. For example, the distance between the two blades of the crusher is set so that refractory bricks with a particle size of 50 mm or less fall from the crusher. Here, the particle size of the refractory brick is defined as the equivalent diameter of a circle.

[0019] First Screening Device The first screening device is a sieve that screens used refractory bricks to select refractory bricks with a particle size of 20 - 50 mm from refractory bricks with a particle size of 50 mm or less by the crushing device. The particle size of 20 mm or more means that it is on the sieve with a mesh opening of 20 mm. By this screening, multiple fractions of refractory bricks with different particle sizes are separated and recovered. The first screening device uses a sieve with a mesh opening of 20 mm, but various sizes of sieves can be set according to the selected target particle size. Also, the first screening device may be composed of sieves with different mesh openings.

[0020] Keren Device (Sizing Device) Fig. 2 shows a PGS granulator 5 which is an example of a keren device. The keren device consists of two rotating drums, an inner drum 7 which is cylindrical and extends along the axis, and an outer drum 6 which covers the inner drum. The outer drum 6 is located at a position where the rotation axis 51 is eccentric with respect to the inner drum 7. Inner blades 71 are attached to the outer peripheral surface of the inner drum 7 in a spiral arrangement with individual blades side by side. Outer blades 61 are attached to the inner peripheral surface of the outer drum 6 in a spiral arrangement with individual blades side by side. Note that in the present invention, the granulating device is not limited to the PGS granulator. The inner drum and the outer drum rotate in opposite directions and have a mechanism in which the rotational speed of the inner drum is higher than that of the outer drum. Preferably, the mechanism is such that the rotational speed of the inner drum is 1.1 to 1.3 times that of the outer drum.

[0021] Second screening device The second screening device is a sieve for selecting refractory bricks with a particle size of 20 to 40 mm from objects such as refractory bricks and slag that have undergone the keren process. By this screening, refractory bricks with a particle size of 20 to 40 mm are separated and recovered. The second screening device uses a 20 mm sieve, but various sizes of sieves can be set according to the selected target particle size. Also, the second screening device may be composed of sieves with different sizes of mesh openings. Here, the particle size of 20 to 40 mm means that it is below the sieve with a mesh opening of 40 mm and above the sieve with a mesh opening of 20 mm.

[0022] Next, a method for manufacturing a refractory brick raw material and a method for separating the surface slag of a refractory brick, which are embodiments of the present invention, will be described in detail. <Method for manufacturing a refractory brick raw material, method for separating the surface slag of a refractory brick> The manufacturing method and separation method of this embodiment include a crushing process for crushing refractory bricks to a particle size below a predetermined value, a first screening process for screening the refractory bricks crushed to a particle size below the predetermined value to obtain refractory bricks with a particle size within a predetermined range, a keren process for separating the surface slag from the refractory bricks with a particle size within the predetermined range, and a second screening process for screening the refractory bricks processed in the keren process to obtain a refractory brick raw material with a particle size within a predetermined range.

[0023] Crushing process Separate the used refractory bricks with a crushing device. In this crushing process, it is important to crush the used refractory bricks to a particle size of 50 mm or less. This is because by keeping the particle size of the refractory bricks required for recycling and making the particle size of the refractory bricks 50 mm or less, the adhesion area of the slag adhering to the surface is reduced, and in the subsequent keren process (sizing process), the slag can be easily removed. Preferably, the refractory bricks are crushed so that the particle size of the refractory bricks is 50 - 40 mm.

[0024] First screening process The refractory bricks with a particle size of 50 mm or less after the crushing process are subsequently separated, in the first screening process, using a sieve with a mesh opening of 20 mm, into refractory bricks with a particle size of 20 - 50 mm, refractory bricks with a particle size of 20 mm or less, and slag. By this screening, the refractory bricks with a particle size of 20 - 50 mm are separated and recovered for the next process.

[0025] Keren process (sizing process) Next, in the keren process, the slag adhering to the surface is separated from the refractory bricks with a particle size of 20 - 50 mm after the first screening process. In this keren process, a dry rotary drum sizing machine is used to separate the slag adhering to the surface of the refractory bricks. In the present invention, the above-mentioned keren device is used.

[0026] Here, an analysis experiment on the separation ability of the slag adhering to the surface of the refractory bricks was conducted using a PGS sizing machine, which is an example of the sizing device shown in FIG. 2. From the environment in which the recycled refractory bricks are used, the target values for the recycled refractory bricks are set such that the content rate of the slag adhering to the surface is 2.7 mass% or less, and the refractory brick yield (the ratio of the used refractory bricks used for the recycled refractory bricks) is 70% or more.

[0027] FIG. 4 shows a graph of the influence of the particle size of the refractory bricks on the content rate (mass%) of the slag adhering to the surface of the refractory bricks. From this, by making the crushing particle size of the refractory bricks 50 mm or less, the residual rate (content rate) of the slag adhering to the surface can be reduced to 2.7 mass% or less.

[0028] In addition, the test results of changing the rotational speed of the rotary drum (outer drum) of the PGS granulator and evaluating the content of slag adhering to the surface and the refractory brick yield are shown in FIGS. 5 and 6. From FIG. 5, by setting the outer drum rotation speed (Hz) to more than 75, the content of slag adhering to the surface of the refractory brick can be made 2.7 mass% or less. From FIG. 6, by setting the outer drum rotation speed (Hz) to less than 125, the refractory brick yield can be made 70% or more.

[0029] Thus, the reason for utilizing the quenching process is that, in order to remove the slag adhering to the surface from the refractory bricks having a particle size of 20 to 50 mm in the first screening process, it has the effect of maintaining a slag residue rate of 2.7% or less and a refractory brick yield of 70% or more.

[0030] In the quenching process, the inner drum and the outer drum of the rotary drum in the above-mentioned quenching device rotate in opposite directions, and it is preferable that the rotation speed of the inner drum is 1.1 to 1.3 times the rotation speed of the outer drum. Here, the rotation speed refers to the number of rotations per unit time (Hz). The reverse rotation is because it can granulate more efficiently and remove the slag adhering to the surface of the refractory brick. Also, making the rotation speed of the inner drum higher than that of the outer drum is to prevent the refractory bricks from being blocked at the pinch part between the inner drum and the outer drum. On the other hand, if the rotation speed of the inner drum is too much higher than that of the outer drum, the refractory bricks will not be conveyed to the pinch part, and the granulation efficiency of the brick surface will decrease. Therefore, the rotation speed of the inner drum is set to 1.1 to 1.3 times the rotation speed of the outer drum.

[0031] Furthermore, it is preferable that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz. By setting the outer drum rotation speed (Hz) to more than 75 and less than 125, the content of slag adhering to the surface of the refractory brick can be made 2.7 mass% or less, and the refractory brick yield can be made 70% or more.

[0032] Second screening process Next, in the second screening step, refractory bricks from the chamotte process (sizing process) and separated surface-attached slag are separated and recovered into a plurality of different fractions by a sieve. Here, by setting the sieve opening to 40 mm, there is an effect of separating the refractory brick raw material with a particle size of 40 to 50 mm on the sieve and other substances including surface-attached slag under the sieve. Through these steps, it becomes possible to separate surface-attached slag from refractory bricks with high precision and in large quantities.

Example

[0033] Recycled refractory brick raw materials were produced from used refractory bricks by the method shown in Fig. 1(a). In the chamotte process, a PGS sizing machine was used, and the inner drum and outer drum of the rotating drum were rotated in opposite directions. The rotational speed of the inner drum was 120 Hz, and the rotational speed of the outer drum was 100 Hz. As a result, in the implementation of the present invention, a throughput of 4 t / h, which could not be achieved by the conventional method, was realized, and a surface-attached slag content (residual rate) of 2.5 mass% and a refractory brick yield of 74% were obtained.

[0034] Note that although the embodiments of the present invention have been described in the above examples, the present invention is not limited thereto.

Explanation of Reference Numerals

[0035] 5 Sizing machine 51 Rotating shaft 6 Outer drum 61 Outer drum blade (outer blade) 7 Inner drum 71 Inner drum blade (inner blade) 8 Pressure 9 Outer drum rotation direction 10 Inner drum rotation direction

Claims

1. A method for manufacturing refractory brick raw materials for recycling, comprising: a crushing step of crushing used refractory bricks to a particle size of a predetermined size or less; a first screening step of screening the refractory bricks crushed to the particle size of a predetermined size or less to obtain refractory bricks having a particle size within a predetermined range; a keren step of separating surface slag from the refractory bricks having a particle size within the predetermined range; a second screening step of screening the refractory bricks processed in the keren step to obtain refractory brick raw materials having a particle size within a predetermined range; and in the keren step, the rotating drum having a cylindrical shape extending along the axis has an inner drum and an outer drum whose rotation axis is eccentric. By an inner blade provided on the outer peripheral surface of the inner drum and an outer blade provided on the inner peripheral surface of the outer drum, in the clamping portion between the inner drum and the outer drum, the refractory bricks are sized and surface slag is separated from the refractory bricks. A method for manufacturing refractory brick raw materials, characterized by the above.

2. A crushing step of crushing used refractory bricks to a particle size of 50 mm or less; a first screening step of screening the refractory bricks crushed to a particle size of 50 mm or less to obtain refractory bricks having a particle size of 20 to 50 mm; a keren step of separating surface slag from the refractory bricks having a particle size of 20 to 50 mm; a second screening step of screening the refractory bricks processed in the keren step to obtain refractory brick raw materials having a particle size of 20 to 40 mm; The method for manufacturing refractory brick raw materials according to claim 1, characterized by including the above.

3. The method for manufacturing refractory brick raw materials according to claim 2, characterized in that in the crushing step, the refractory bricks are crushed to a particle size of 50 to 40 mm.

4. The method for manufacturing refractory brick raw materials according to claim 1, characterized in that the inner drum and the outer drum of the rotating drum rotate in opposite directions, and the rotation speed of the inner drum is 1.1 to 1.3 times the rotation speed of the outer drum. Here, the rotation speed refers to the number of rotations per unit time (Hz).

5. The method for manufacturing refractory brick raw materials according to claim 4, characterized in that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

6. A crushing device for crushing used refractory bricks to a particle size of a predetermined size or less; a first screening device for screening the refractory bricks crushed to the particle size of a predetermined size or less to obtain refractory bricks within a predetermined range; a keren device for separating surface slag from the refractory bricks having a particle size within the predetermined range; A second screening device that screens the refractory bricks processed by the keren device to obtain refractory brick raw materials with a particle size within a predetermined range. The keren device is a rotating drum having a cylindrical shape extending along an axis and having an inner drum and an outer drum whose rotation axis is eccentric, an inner blade provided on the outer peripheral surface of the inner drum, an outer blade provided on the inner peripheral surface of the outer drum, wherein the inner drum and the outer drum rotate in opposite directions, and the rotation speed of the inner drum is higher than that of the outer drum, and a pressing portion is formed between the inner drum and the outer drum. A manufacturing facility for refractory brick raw materials, characterized in that.

7. A crushing device that crushes used refractory bricks to a particle size of 50 mm or less, a first screening device that screens the refractory bricks crushed to a particle size of 50 mm or less to obtain refractory bricks with a particle size of 20 to 50 mm, a keren device that separates the surface slag from the refractory bricks with a particle size of 20 to 50 mm, a second screening device that screens the refractory bricks processed by the keren device to obtain refractory brick raw materials with a particle size of 20 to 40 mm, wherein the inner drum and the outer drum have a mechanism in which the rotation speed of the inner drum is 1.1 to 1.3 times that of the outer drum, The manufacturing facility for refractory brick raw materials according to claim 6, characterized by having.

8. The manufacturing facility for refractory brick raw materials according to claim 7, characterized in that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

9. A crushing step of crushing used refractory bricks to a particle size below a predetermined size, a first screening step of screening the refractory bricks crushed to the particle size below the predetermined size to obtain refractory bricks with a particle size within a predetermined range, a keren step of separating the surface slag from the refractory bricks with a particle size within the predetermined range, a second screening step of screening the refractory bricks processed in the keren step to obtain refractory brick raw materials with a particle size within a predetermined range, including In the keren step, the rotating drum having a cylindrical shape extending along the axis has an inner drum and an outer drum whose rotation axis is eccentric. By the inner blade provided on the outer peripheral surface of the inner drum and the outer blade provided on the inner peripheral surface of the outer drum, in the pressing portion between the inner drum and the outer drum, the refractory bricks are sized and the surface slag is separated from the refractory bricks. A method for separating refractory brick surface slag, characterized in that.

10. A crushing step of crushing used refractory bricks to a particle size of 50 mm or less, The crushed refractory bricks with a particle size of 50 mm or less are screened to obtain a first screening step of obtaining refractory bricks with a particle size of 20 to 50 mm, a keren step of separating the surface slag from the refractory bricks with a particle size of 20 to 50 mm, a second screening step of screening the refractory bricks processed in the keren step to obtain a refractory brick raw material with a particle size of 20 to 40 mm, A method for separating the surface slag of refractory bricks according to claim 9, characterized by including the above.

11. The method for separating the surface slag of refractory bricks according to claim 10, characterized in that in the crushing step, the refractory brick is crushed to a particle size of 50 to 40 mm.

12. The method for separating the surface slag of refractory bricks according to claim 9, characterized in that the inner drum and the outer drum of the rotary drum rotate in opposite directions, and the rotation speed of the inner drum is 1.1 to 1.3 times that of the outer drum. Here, the rotation speed refers to the number of rotations per unit time (Hz).

13. The method for separating the surface slag of refractory bricks according to claim 12, characterized in that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

14. A crushing device for crushing used refractory bricks to a particle size below a predetermined size, a first screening device for screening the refractory bricks crushed to a particle size below the predetermined size to obtain refractory bricks within a predetermined range, a keren device for separating the surface slag from the refractory bricks within the predetermined range of particle sizes, a second screening device for screening the refractory bricks processed by the keren device to obtain a refractory brick raw material within a predetermined range of particle sizes, and the keren device is a rotary drum having a cylindrical shape extending along an axis having an inner drum and an outer drum whose rotation axis is eccentric, an inner blade provided on the outer peripheral surface of the inner drum, an outer blade provided on the inner peripheral surface of the outer drum, the inner drum and the outer drum rotate in opposite directions, and the rotation speed of the inner drum is higher than that of the outer drum, and a separation facility for the surface slag of refractory bricks, characterized in that a pressing portion is formed between the inner drum and the outer drum.

15. A crushing device for crushing used refractory bricks to a particle size of 50 mm or less, a first screening device for screening the refractory bricks crushed to a particle size of 50 mm or less to obtain refractory bricks with a particle size of 20 to 50 mm, a keren device for separating the surface slag from the refractory bricks with a particle size of 20 to 50 mm, A second sieving device that sieves refractory bricks processed by a keren device to obtain refractory brick raw materials with a particle size of 20 to 40 mm, a mechanism in which the rotation speed of the inner drum is 1.1 to 1.3 times the rotation speed of the outer drum for the inner drum and the outer drum, The refractory brick surface slag separation facility according to claim 14, characterized by having the above.

16. The refractory brick surface slag separation facility according to claim 15, characterized in that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

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