JP7687356B2 - Method and equipment for producing refractory brick raw material, and method and equipment for separating slag from the surface of refractory brick - Google Patents

Description

The present invention relates to a method and equipment for producing raw materials for recycled refractory bricks, which separates slag adhering to used refractory bricks, and a method and equipment for separating slag from the surface layer of refractory bricks for recycling.

In recent years, in order to increase the recycling efficiency of the pig iron making process, especially steel making, it has been proposed to reuse the refractory bricks used in the pig iron making process. Refractory bricks include torpedo bricks and converter bricks. Generally, iron and slag adhere to the working surface of a refractory brick (the surface that comes into contact with molten steel and slag) through the pores in the refractory, and mortar may also adhere to other surfaces. When recycling refractory, it is necessary to remove these contaminants, as they significantly reduce the durability of the refractory and make it unusable.
Currently, refractory bricks are only partially reused by manually striking them to separate the slag adhering to their surfaces and then crushing them. In order to efficiently recycle refractory bricks, it is necessary to automate the separation of the slag adhering to the refractory bricks and make it possible to do so in large quantities.

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

JP 2020-131400 A JP 2001-9390 A

The above-mentioned conventional techniques have the following problems.
When removing the slag adhering to the surface of the refractory bricks as described above, the hardness of the refractory bricks is 9.6 MPa, and that of the slag is 14.0 MPa, meaning that the hardness of the bricks, which are the base material, is lower than that of the adhering slag. Therefore, it is necessary to scrape off only the slag adhering to the surface, but if more scraping is performed than necessary, the brick yield rate decreases, so the scraping device disclosed in Patent Documents 1 and 2 cannot be used as is. Therefore, it is necessary to make the slag adhering to the surface easy to peel off, and then apply a momentary force to peel off and separate the slag adhering to the surface from the bricks.

Furthermore, when scraping work was done manually as in the past, it was unsatisfactory in terms of work efficiency and running costs. Also, when using the automatic scraping equipment that has already been proposed, as mentioned above, there was a problem that the refractory bricks were largely scraped off, resulting in a decrease in yield, because the base material, the bricks, are less hard than the adhering slag.

The present invention has been made in consideration of the above-mentioned circumstances, and aims to propose a method for separating slag adhering to the surface of refractory bricks and the separation equipment thereof, which makes it possible to make the slag adhering to the surface in a state where it can be easily peeled off, and then to apply a momentary force to peel off and separate the slag adhering to the surface from the bricks, as well as a method for manufacturing refractory brick raw materials and the manufacturing equipment thereof.

The inventors conducted intensive experiments and studies to solve the above problems. As a result, they discovered that when sizing refractory bricks, crushing the bricks beforehand makes it easier for the adhering slag to come off, and by sizing the bricks after crushing, the slag adhering to the refractory bricks can be efficiently removed.

The method for producing a refractory slag raw material according to the present invention, which advantageously solves the above problems, is configured as follows.
[1] A method for producing recycled refractory brick raw material, comprising: a crushing step of crushing used refractory bricks to a particle size not exceeding a predetermined size; a first sieving step of sieving the refractory bricks crushed to a particle size not exceeding the predetermined size to obtain refractory bricks having a particle size within a predetermined range; a scraping 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 treated in the scraping step to obtain refractory brick raw material having a particle size within the predetermined range.
[2] The method for producing a raw material for refractory bricks according to the above item [1], further 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 a particle size of 50 mm or less to obtain refractory bricks having a particle size of 20 to 50 mm; a scraping step of separating surface layer slag from the refractory bricks having a particle size of 20 to 50 mm; and a second sieving step of sieving the refractory bricks treated in the scraping step to obtain raw material refractory bricks having a particle size of 20 to 40 mm.
[3] The method for producing a raw material for refractory bricks according to the above [2], wherein the refractory bricks are crushed to a grain size of 50 to 40 mm in the crushing step.
[4] In the above [2] or [3], in the scraping step, the rotating drum having a cylindrical shape extending along the axis has an inner drum and an outer drum whose rotation axis is eccentrically positioned, and the refractory bricks are sized 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, and the method for producing a refractory brick raw material separates 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] The method for producing a refractory brick raw material according to the above [5], wherein the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

The manufacturing facility for producing raw materials for refractory bricks according to the present invention, which advantageously solves the above problems, is configured as follows.
[7] A manufacturing facility for raw materials for refractory bricks, comprising: a crushing device for crushing used refractory bricks to a particle size not exceeding a predetermined size; a first sieving device for sieving the refractory bricks crushed to a particle size not exceeding the predetermined size to obtain refractory bricks having a particle size within a predetermined range; a scraping device for separating surface slag from the refractory bricks having a particle size within the predetermined range; and a second sieving device for sieving the refractory bricks processed by the scraping device to obtain refractory bricks having a particle size within a predetermined range, wherein the scraping device is a cylindrical rotating drum extending along an axis having an inner drum and an outer drum whose rotating shaft is eccentrically positioned, 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 faster than the rotation speed of the outer drum.
[8] In the above [7], the facility for producing raw materials for refractory bricks includes a crushing device for crushing used refractory bricks into pieces having 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 having a particle size of 20 to 50 mm, a scraping device for separating surface slag from the refractory bricks having a particle size of 20 to 50 mm, and a second sieving device for sieving the refractory bricks treated by the scraping device to obtain refractory bricks having a particle size of 20 to 40 mm, wherein the scraping device is a cylindrical rotating drum extending along an axis having an inner drum and an outer drum whose rotating shaft is eccentrically positioned, 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 the rotation speed of the outer drum.
[9] In the above [8], the manufacturing facility for a refractory brick raw material is configured so that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

The method for separating slag from the surface layer of a refractory brick according to the present invention, which advantageously solves the above problems, is configured as follows.
[10] A method for separating surface layer slag of refractory bricks, comprising: a crushing step of crushing used refractory bricks to a particle size not exceeding a predetermined particle size; a first sieving step of sieving the refractory bricks crushed to a particle size not exceeding the predetermined particle size to obtain refractory bricks having a particle size within a predetermined range; a scraping step of separating surface layer slag from the refractory bricks having a particle size within the predetermined range; and a second sieving step of sieving the refractory bricks treated in the scraping step to obtain raw refractory bricks having a particle size within a predetermined range.
[11] The method for separating surface layer slag of refractory bricks in the above [10], 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 a particle size of 50 mm or less to obtain refractory bricks having a particle size of 20 to 50 mm; a scraping step of separating surface layer slag from the refractory bricks having a particle size of 20 to 50 mm; and a second sieving step of sieving the refractory bricks treated in the scraping step to obtain raw refractory bricks having a particle size of 20 to 40 mm.
[12] The method for separating slag from a surface layer of a refractory brick according to the above [11], wherein the refractory bricks are crushed to a particle size of 50 to 40 mm in the crushing step.
[13] In the above [11] or [12], in the scraping step, the rotating drum having a cylindrical shape extending along the axis has an inner drum and an outer drum whose rotation axis is eccentrically positioned, and the refractory bricks are sized 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, and the method for separating surface layer slag from the refractory bricks is provided.
[14] The method for separating slag from the surface layer of refractory bricks according to the above [13], wherein the inner and outer drums 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).
[15] The method for separating slag from the surface layer of a refractory brick according to the above [14], wherein the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

The equipment for separating slag from the surface layer of refractory bricks according to the present invention, which advantageously solves the above problems, is configured as follows.
[16] A separation facility for separating surface layer slag of refractory bricks, comprising: a crushing device for crushing used refractory bricks to a particle size not larger than a predetermined size; a first sieving device for sieving the refractory bricks crushed to a particle size not larger than the predetermined size to obtain refractory bricks having a particle size within a predetermined range; a scraping device for separating surface layer slag from the refractory bricks having a particle size within the predetermined range; and a second sieving device for sieving the refractory bricks processed by the scraping device to obtain raw refractory bricks having a particle size within a predetermined range, wherein the scraping device is a cylindrical rotating drum extending along an axis having an inner drum and an outer drum whose rotating shaft is eccentrically positioned, 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.
[17] In the above [16], the facility for separating surface layer slag of refractory bricks includes 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 having a particle size of 20 to 50 mm, a scraping device for separating surface layer slag from the refractory bricks having a particle size of 20 to 50 mm, a second sieving device for sieving the refractory bricks treated by the scraping device to obtain raw refractory bricks having a particle size of 20 to 40 mm, and a mechanism for setting the rotation speed of the inner drum to 1.1 to 1.3 times that of the outer drum.
[18] The equipment for separating slag from the surface layer of refractory bricks according to the above [17], wherein the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz.

According to the present invention, by passing used refractory bricks through a crushing process, a sieving process, a granulation process (scraping process), and a sieving process, it is possible to separate the slag adhering to the surface of the refractory bricks. As a result, the residual slag rate on the surface of the refractory bricks is reduced to 2.7% or less, and the yield of the refractory bricks is increased to 70% or more, making it possible to produce a large amount of high-quality raw refractory brick material for recycling.

1A is a flow chart showing a conventional method for producing a raw material for recycled refractory bricks, and FIG. 1B is a flow chart showing a method for producing a raw material for recycled refractory bricks according to the present invention. FIG. 2 is a schematic diagram of a scraping device in a scraping process. FIG. 1A is an explanatory diagram of a method for producing recycled refractory brick raw materials using a manual scraping method (conventional method), FIG. 1B is an explanatory diagram of a method for producing recycled refractory brick raw materials using a rotary drum scraping method (conventional method), and FIG. 1C is an explanatory diagram of a method for producing recycled refractory brick raw materials showing an example of an embodiment of the present invention. 1 is a graph showing the relationship between the size (grain size) of a refractory brick and the content of slag adhering to the brick. 1 is a graph showing the effect of the rotation speed of the outer rotating drum of the scraping device on the content ratio of slag adhering to refractory bricks. 1 is a graph showing the effect of the rotation speed of the outer rotating drum of the scraping device on the yield of refractory bricks.

A method for carrying out the present invention will be specifically described. Note that the following description shows a preferred embodiment of the present invention, and the present invention is not limited to the following description in any way.
An embodiment of the present invention will be described below with respect to a production facility and a production method for raw materials for recycled refractory bricks, as well as a method and a separation facility for slag from the surface layer of the refractory bricks.

As shown in FIGS. 1 and 3, the production of a raw material for refractory bricks for recycling and the separation of slag from the surface layer of the refractory bricks according to the embodiment of the present invention include the following steps (1) to (4).
(1) Crushing step (2) First sieving step (3) Scraping step (4) Second sieving step

First, a detailed description will be given of a production facility for refractory brick raw material and a separation facility for slag from the surface layer of refractory bricks, which is an embodiment of the present invention.
<Production equipment for refractory brick raw materials, refractory brick surface slag separation equipment>
As an example of this embodiment, a production facility for raw materials for refractory bricks to be recycled and a separation facility for slag from the surface layer of the refractory bricks are shown in Figs. 2 and 3.
The manufacturing equipment and separation equipment of this embodiment include a crushing device that crushes used refractory bricks to a particle size equal to or smaller than a predetermined particle size, a first sieving device that sieves the refractory bricks crushed to a particle size equal to or smaller to obtain refractory bricks of a predetermined range, a scraping device that separates surface slag from the refractory bricks of the predetermined particle size range, and a second sieving device that sieves the refractory bricks processed by the scraping device to obtain refractory brick raw material of a predetermined particle size range.

Crushing device The crushing device crushes the used refractory bricks using a crushing machine such as a jaw crusher. For example, the distance between both 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 grain size of the refractory brick is defined as the diameter of an equivalent circle.

First sieve device The first sieve device is a sieve that separates used refractory bricks, for example, refractory bricks with a particle size of 20 to 50 mm from refractory bricks with a particle size of 50 mm or less by a crushing device. A particle size of 20 mm or more means that the bricks are on the sieve with a mesh size of 20 mm. By this sieving, different fractions of refractory bricks are separated and recovered. The first sieve device uses a sieve with a mesh size of 20 mm, but sieves of various sizes can be set depending on the particle size to be selected. The first sieve device may also be configured with sieves with mesh sizes of different sizes.

Scraping device (granulation device)
Fig. 2 shows a PGS sieving machine 5, which is an example of a scraping device. The scraping device is composed of two rotating drums, an inner drum 7 having a cylindrical shape extending along an axis and an outer drum 6 covering the inner drum, and the outer drum 6 is located in a position where the inner drum 7 and the rotating shaft 51 are eccentric. An inner blade 71 is attached to the outer peripheral surface of the inner drum 7, with each blade arranged in a spiral shape. An outer blade 61 is attached to the inner peripheral surface of the outer drum 6, with each blade arranged in a spiral shape. Note that in the present invention, the sieving device is not limited to a PGS sieving machine.
The inner drum and the outer drum rotate in opposite directions, and the inner drum has a rotation speed greater than that of the outer drum. Preferably, the inner drum has a rotation speed 1.1 to 1.3 times that of the outer drum.

Second Sieve Device The second sieve device is a sieve that separates refractory bricks with a particle size of 20 to 40 mm from objects such as refractory bricks and slag that have been subjected to the scraping process. This sieving separates and recovers refractory bricks with a particle size of 20 to 40 mm. The second sieve device uses a 20 mm sieve, but sieves of various sizes can be set depending on the particle size to be selected. The second sieve device may also be configured with sieves with different sizes of openings. Here, a particle size of 20 to 40 mm means that the particle size is below the sieve with a 40 mm opening and above the sieve with a 20 mm opening.

Next, a detailed description will be given of a method for producing a refractory brick raw material and a method for separating slag from the surface layer of the refractory brick, which are one embodiment of the present invention.
<Method for producing raw material for refractory bricks, and method for separating slag from the surface layer of refractory bricks>
The manufacturing method and separation method of this embodiment include a crushing step of crushing refractory bricks to a particle size not exceeding a predetermined size, a first sieving step of sieving the refractory bricks crushed to a particle size not exceeding the predetermined size to obtain refractory bricks having a particle size within a predetermined range, a scraping 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 treated in the scraping step to obtain raw refractory bricks having a particle size within a predetermined range.

Crushing step: The used refractory bricks are separated by a crushing device. In this crushing step, it is important to crush the used refractory bricks to a particle size of 50 mm or less. This is because by making the particle size of the refractory bricks 50 mm or less while maintaining the particle size of the refractory bricks required for recycling, the adhesion area of the slag adhering to the surface is reduced, which has the effect of making it easier to remove the slag in the subsequent scraping step (sizing step). Preferably, the refractory bricks are crushed to a particle size of 50 to 40 mm.

The refractory bricks having a particle size of 50 mm or less that have been through the crushing process are then screened through a screen with a mesh size of 20 mm in the first screening process to separate refractory bricks having a particle size of 20 to 50 mm, refractory bricks having a particle size of 20 mm or less, and slag. Through this screening, the refractory bricks having a particle size of 20 to 50 mm are separated and collected for the next process.

Scraping process (granulation process)
Next, in the scraping process, the slag adhering to the surface of the refractory bricks having a particle size of 20 to 50 mm after the first sieving process is separated. In this scraping process, the slag adhering to the surface of the refractory bricks is separated using a dry rotary drum granulator. In the present invention, the above scraping device is used.

Here, an experiment was carried out to analyze the separation capability of slag adhering to the surface of refractory bricks using a PGS granulator, which is an example of a granulator shown in FIG.
Considering the environment in which the recycled refractory bricks are used, the target values for the recycled refractory bricks are set to a surface-adhered slag content of 2.7 mass% or less and a refractory brick yield (the proportion of used refractory bricks used for recycled refractory bricks) of 70% or more.

FIG. 4 is a graph showing the effect of the particle size of the refractory brick on the content (mass %) of slag adhering to the surface of the refractory brick.
As a result, by setting the crushed particle size of the refractory bricks to 50 mm or less, the residual rate (content) of surface-adhering slag can be reduced to 2.7 mass % or less.

5 and 6 show the results of a test in which the rotation speed of the rotating drum (outer drum) of the PGS granulator was changed and the content of slag adhering to the surface and the yield of refractory bricks were evaluated.
As can be seen 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 bricks can be reduced to 2.7 mass % or less.
As can be seen from FIG. 6, by setting the outer drum rotation speed (Hz) to less than 125, the refractory brick yield can be increased to 70% or more.

The reason for utilizing the scraping process in this way is that it is effective in removing slag adhering to the surface of refractory bricks that have been sieved to a particle size of 20 to 50 mm in the first sieving process, while maintaining a slag residual rate of 2.7% or less and a refractory brick yield of 70% or more.

In the scraping step, it is preferable that the inner and outer drums of the rotating drum in the scraping device 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).
The reason for the counter-rotation is that the slag adhering to the surface of the refractory bricks can be removed more efficiently by sizing the bricks. The reason for making the rotation speed of the inner drum faster than that of the outer drum is to prevent the refractory bricks from clogging the area between the inner and outer drums. On the other hand, if the rotation speed of the inner drum is too faster than that of the outer drum, the refractory bricks will not be transported to the area, and the efficiency of sizing the brick surface will decrease. Therefore, the rotation speed of the inner drum is set to 1.1 to 1.3 times that of the outer drum.

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 bricks can be set to 2.7 mass % or less, and the refractory brick yield can be set to 70% or more.

Next, in the second sieving process, the refractory bricks from the scraping process (sizing process) and the separated surface-adhering slag are separated into multiple different fractions and collected by a sieve. Here, by setting the sieve opening to 40 mm, it is possible to separate the refractory brick raw material with a particle size of 40 to 50 mm on the sieve and the other materials including the surface-adhering slag below the sieve.
These steps make it possible to separate the surface-adhering slag from the refractory bricks with high precision and in large quantities.

Refractory brick raw material for recycling was produced from used refractory bricks by the method shown in Fig. 1 (a). In the scraping process, a PGS granulator was used, and the inner and outer drums of the rotating drum were rotated in opposite directions, with the inner drum rotating at 120 Hz and the outer drum rotating at 100 Hz.
As a result, in the practice of the present invention, a processing rate of 4 t/h was achieved, which was not possible with the conventional method, while a surface-adhering slag content (residual rate) of 2.5 mass % and a refractory brick yield of 74% were obtained.

Although the above examples are illustrative of the present invention, the present invention is not limited to these.

5 Granulator 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 (16)

A method for producing recycled refractory brick raw material, comprising the steps of:
a crushing step of crushing the used refractory bricks into pieces having a particle size equal to or smaller than a predetermined particle size;
a first sieving step of sieving the refractory bricks crushed to a particle size equal to or smaller than the predetermined particle size to obtain refractory bricks having a particle size within a predetermined range;
a scraping step of separating surface layer slag from the refractory bricks having a particle size within the predetermined range;
a second sieving step of sieving the refractory bricks treated in the scraping step to obtain refractory brick raw material having a particle size within a predetermined range;
Including,
In the scraping process, the rotating drum having a cylindrical shape extending along an axis has an inner drum and an outer drum whose rotation axis is eccentrically positioned, and 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 size-regulates the refractory bricks in the clamping section between the inner drum and the outer drum, and separates surface slag from the refractory bricks. a crushing step of crushing the used refractory bricks into particles having 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 scraping step for separating surface slag from refractory bricks having a particle size of 20 to 50 mm;
a second sieving step of sieving the refractory bricks treated in the scraping step to obtain refractory brick raw material having a particle size of 20 to 40 mm;
The method for producing a refractory brick raw material according to claim 1, further comprising the steps of: The method for producing refractory brick raw material according to claim 2, characterized in that in the crushing process, the refractory bricks are crushed to a particle size of 50 to 40 mm. The method for producing a refractory brick raw material 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 (Hz) per unit time. The method for producing a refractory brick raw material according to claim 4 , characterized in that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz. A crushing device for crushing the used refractory bricks into pieces having a particle size equal to or smaller than a predetermined size;
a first sieve device for sieving the refractory bricks crushed to a particle size equal to or smaller than the predetermined particle size to obtain refractory bricks within a predetermined range;
a scraping device for separating surface layer slag from the refractory bricks having a particle size within the predetermined range;
a second sieving device for sieving the refractory bricks treated by the scraping device to obtain refractory brick raw material having a particle size within a predetermined range,
The scraping device is
A cylindrical rotating drum extending along an axis line having an inner drum and an outer drum whose rotation axis is eccentrically positioned,
An inner blade provided on an outer circumferential surface of the inner drum;
An outer blade provided on an inner peripheral surface of the outer drum;
a mechanism in which the inner drum and the outer drum rotate in opposite directions and the rotation speed of the inner drum is greater than the rotation speed of the outer drum;
Have
A manufacturing facility for refractory brick raw material, characterized in that a pressing section is formed between the inner drum and the outer drum . A crushing device for crushing used refractory bricks into particles having a diameter 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 having a particle size of 20 to 50 mm;
A scraping device for separating surface slag from refractory bricks having a particle size of 20 to 50 mm;
a second sieving device for sieving the refractory bricks treated by the scraping device to obtain refractory brick raw material having a particle size of 20 to 40 mm;
The inner drum and the outer drum have a mechanism for rotating the inner drum at a speed 1.1 to 1.3 times that of the outer drum;
7. The manufacturing facility for refractory brick raw materials according to claim 6 , further comprising: 8. The equipment for producing a refractory brick raw material according to claim 7 , characterized in that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz. a crushing step of crushing the used refractory bricks into pieces having a particle size equal to or smaller than a predetermined particle size;
a first sieving step of sieving the refractory bricks crushed to a particle size equal to or smaller than the predetermined particle size to obtain refractory bricks having a particle size within a predetermined range;
a scraping step of separating surface layer slag from the refractory bricks having a particle size within the predetermined range;
a second sieving step of sieving the refractory bricks treated in the scraping step to obtain refractory brick raw material having a particle size within a predetermined range;
Including,
In the scraping process, the rotating drum having a cylindrical shape extending along an axis has an inner drum and an outer drum whose rotation axis is eccentrically positioned, and 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 size-regulates the refractory bricks in the clamping section between the inner drum and the outer drum, and separates the surface slag from the refractory bricks. a crushing step of crushing the used refractory bricks into particles having 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 scraping step for separating surface slag from refractory bricks having a particle size of 20 to 50 mm;
a second sieving step of sieving the refractory bricks treated in the scraping step to obtain refractory brick raw material having a particle size of 20 to 40 mm;
The method for separating refractory brick surface slag according to claim 9 , further comprising: 11. The method for separating slag from a surface layer of a refractory brick according to claim 10 , wherein in the crushing step, the refractory bricks are crushed to particle sizes of 50 to 40 mm. The method for separating slag from the surface layer of refractory bricks according to claim 9 , characterized in that the inner and outer drums 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, where the rotation speed refers to the number of rotations per unit time (Hz). The method for separating slag from the surface layer of a refractory brick according to claim 12 , characterized in that the rotation speed of the outer drum is more than 75 Hz and less than 125 Hz. A crushing device for crushing the used refractory bricks into pieces having a particle size equal to or smaller than a predetermined size;
a first sieve device for sieving the refractory bricks crushed to a particle size equal to or smaller than the predetermined particle size to obtain refractory bricks within a predetermined range;
a scraping device for separating surface layer slag from the refractory bricks having a particle size within the predetermined range;
a second sieving device for sieving the refractory bricks treated by the scraping device to obtain refractory brick raw material having a particle size within a predetermined range,
The scraping device is
A cylindrical rotating drum extending along an axis line having an inner drum and an outer drum whose rotation axis is eccentrically positioned,
An inner blade provided on an outer circumferential surface of the inner drum;
An outer blade provided on an inner peripheral surface of the outer drum;
a mechanism in which the inner drum and the outer drum rotate in opposite directions and the rotation speed of the inner drum is greater than the rotation speed of the outer drum;
Have
A refractory brick surface slag separation equipment, characterized in that a pressing section is formed between the inner drum and the outer drum . A crushing device for crushing used refractory bricks into particles having a diameter 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 having a particle size of 20 to 50 mm;
A scraping device for separating surface slag from refractory bricks having a particle size of 20 to 50 mm;
a second sieving device for sieving the refractory bricks treated by the scraping device to obtain refractory brick raw material having a particle size of 20 to 40 mm;
The inner drum and the outer drum have a mechanism for rotating the inner drum at a speed 1.1 to 1.3 times that of the outer drum;
The equipment for separating refractory brick surface slag according to claim 14 , further comprising: The equipment for separating slag from the surface layer of refractory bricks 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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