JP5798217B1 - Granulated slag production apparatus and granulated slag production method - Google Patents

Abstract

The production efficiency of granulated slag is improved without increasing the area of a screen constituting an invar filter. A granulated slag manufacturing apparatus 170 includes a granulated slurry generating unit 220 that generates water granulated slurry by injecting water onto molten slag discharged from a blast furnace main body 110, and dewatered the granulated slurry and granulated. A plurality of granulated slag production units 200 configured to include an inva filter 250 for obtaining slag, the granulated slurry generated by the granulated slurry generation unit of one granulated slag production unit 200A, Delivery means 400 for delivering to the invar filter 250 of the granulated slag production unit 200B is provided. [Selection] Figure 4

Description

  The present invention relates to a granulated slag production apparatus and a granulated slag production method for producing granulated slag from molten slag discharged from a blast furnace.

  The hot metal and molten slag generated in the blast furnace are discharged from the tap outlet. The hot metal is poured into a torpedo car through the output and sent to the downstream equipment such as a converter. On the other hand, the molten slag is diverted to the soot branched from the tuna and sent to a dry pit or a granulated slag production apparatus. In the dry pit, the molten slag is gradually cooled to produce ballast (gravel). The granulated slag production device produces pressurized granulated slag by injecting pressurized water into the molten slag and rapidly crushing it. In addition, since granulated slag has much demand compared with ballast, molten slag is processed more in the granulated slag production apparatus than dry pit.

  As described above, in the granulated slag manufacturing apparatus, since pressurized water is injected into the molten slag, a granulated slurry that is a mixture of the granulated slag and water is generated. Therefore, the dewatering apparatus for dewatering the granulated slurry is provided in the granulated slag manufacturing apparatus. As such a dewatering device, for example, an invar filter that includes a cylindrical screen installed so that its axis is in the horizontal direction and a drive unit that rotates the screen, and dewaters the granulated slurry on the inner wall surface of the screen. (INBA filter) is used (for example, Patent Document 1).

JP-A-8-157241

  The production capacity of the granulated slag in the apparatus for producing granulated slag provided with the invar filter of Patent Document 1 depends on the area of the screen of the invar filter. Generally, the area (size) of the screen is determined based on the amount of molten slag delivered from one spout. Therefore, when the spout is expanded at the end of the tapping period and the amount of molten slag to be delivered increases, or during the period in which molten slag is sent out from the two spouts at the same time, dewatering with the invar filter is in time. Sometimes it disappeared. In this case, the delivery destination of the molten slag must be switched from the granulated slag production apparatus to the dry pit, and there is a problem that the production efficiency of the granulated slag is lowered.

  Here, it may be possible to improve the dewatering efficiency by increasing the area of the screen constituting the invar filter, but there is a problem that the cost required for the invar filter increases.

  An object of the present invention is to provide a granulated slag production apparatus and a granulated slag production method capable of improving the production efficiency of granulated slag without increasing the area of the screen constituting the invar filter. is there.

  In order to solve the above problems, the granulated slag production apparatus of the present invention includes a granulated slurry generating unit that generates water granulated slurry by injecting water onto the molten slag discharged from the blast furnace body, and the granulated slurry. A granulated slag production device comprising a plurality of granulated slag production units comprising an invar filter that dehydrates and obtains granulated slag, wherein the granulated slurry generation of one granulated slag production unit It is characterized by comprising a sending means for sending the granulated slurry generated by the section to the invar filter of another granulated slag production unit.

  The plurality of granulated slag production units each include a granulation tank that stores the granulated slurry produced by the granulated slurry production unit and separates water vapor from the granulated slurry, and the delivery means May send the granulated slurry in the granulated tank to the other granulated slag production unit.

  Moreover, the sending means may connect the granulating tanks.

  The delivery means includes a delivery pipe extending from a downstream side of the granulated slurry generation unit in the first granulated slag production unit, and a pump for circulating the granulated slurry through the delivery pipe. It may be configured.

  The pump may be provided in the delivery pipe, and the delivery means may further include a shut-off valve provided on the upstream side of the pump in the delivery pipe.

  The delivery means may further include a buffer tank that stores the granulated slurry between the shutoff valve and the pump.

  In order to solve the above problems, the granulated slag production method of the present invention is a granulated slag production method using a plurality of granulated slag production units that produce granulated slag from molten slag discharged from a blast furnace. In the one granulated slag production unit, the step of injecting water into the molten slag to produce a granulated slurry, and the granulated slurry produced in the first granulated slag production unit, When the water granulated slag production unit is dehydrated to produce the water granulated slag and a predetermined condition is satisfied, the water granulated slurry generated in the first water granulated slag production unit is transferred to the other water The step of sending to the crushed slag production unit and the granulated slurry sent from the one granulated slag production unit are dehydrated in the other granulated slag production unit. Characterized in that it comprises a step of producing a granulated slag, a.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing efficiency of granulated slag can be improved, without increasing the area of the screen which comprises an invar filter.

It is a figure for demonstrating a blast furnace. It is a figure for demonstrating a granulated slag manufacturing unit. It is a figure for demonstrating an inba filter. It is a figure for demonstrating the delivery means which comprises a granulated slag manufacturing apparatus. It is a flowchart for demonstrating the flow of a process of a granulated slag manufacturing method. It is a figure for demonstrating the sending means concerning a modification.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are denoted by the same reference numerals, and redundant description is omitted, and elements not directly related to the present invention are not illustrated. To do.

  FIG. 1 is a view for explaining a blast furnace 100. In the present embodiment, a blast furnace 100 having a two-face cast floor will be described as an example. As shown in FIG. 1, a blast furnace 100 includes a blast furnace body 110 that generates pig iron by reducing and melting iron ore that is a metal raw material. In the blast furnace body 110, molten slag is generated together with pig iron (molten metal), and a spout 112 (shown as 112A to 112D in FIG. 1) for discharging the generated pig iron and molten slag is provided. It is provided in the lower part.

  Outside the blast furnace main body 110, a tapping iron 120 and a tapping iron 120 through which molten slag flowed from the tapping port 112 flow are provided for each tapping port 112. In addition, a skinmer 130 is provided on the tread 120, and the pig iron and the molten slag are separated by the skinmer 130, and the pig iron passes through the tread 120 and the tilting rod 140 to a torpedo car 142 arranged under the casting floor. Will be guided. On the other hand, the molten slag separated by the skinmer 130 is guided to the shed 150 branched from the output 120, and through the ledge 150 and the rotating ledge 152, the dry pit 160 (indicated by 160A and 160B in FIG. 1). Or it will be guide | induced to the granulated slag manufacturing unit 200 (it shows by 200A, 200B in FIG. 1) which comprises the granulated slag manufacturing apparatus 170. FIG. In the present embodiment, a plurality (two in this case) of the dry pit 160 and the granulated slag production unit 200 are provided.

  Here, in general, in the blast furnace main body 110, in order to perform the tapping while maintaining the liquid level of the pig iron and the molten slag in the blast furnace main body 110, a plurality of tapping outlets 112 are provided. The holes are alternately opened and continuously extracted.

  More specifically, as shown in FIG. 1, the blast furnace 100 having a two-face cast floor is provided with four tap holes 112. In this case, the dry pit 160A and the granulated slag are alternately formed by alternately changing the period for opening the tap opening 112A or the tap opening 112B and the period for opening the tap opening 112C or the tap opening 112D. The production unit 200A, the dry pit 160B and the granulated slag production unit 200B are alternately used.

  For example, during the period in which the spout 112A or the spout 112B is opened, the spout 112B, 112C, 112D is closed while the spout 112A is opened. When a predetermined period of time elapses through the tout 112A and the tout 112A expands to a predetermined size (becomes the end of tapping), the tapping 112C or the tapping The opening 112D is opened, and then the spout 112A is closed. In addition, when a predetermined period of time elapses when the tapping through the spout 112C or the spout 112D is reached, the spout 112A is opened, and then the spout 112C or the spout 112C. Close the mouth port 112D. In addition, it is called a wrap tapping to perform the tapping with both the tapping holes 112 opened. Similarly, while the spout 112B is opened, the spouts 112A, 112C, and 112D are closed, and the spout through the spout 112B passes after a predetermined period of time. Then, the spout 112C or the spout 112D is opened, and then the spout 112B is closed. In addition, when a predetermined period of time elapses when the tapping through the spout 112C or the spout 112D is reached, the spout 112B is opened, and then the spout 112C or Close the mouth port 112D. Therefore, the molten slag extracted from the tap outlet 112A or the tap outlet 112B is introduced into the dry pit 160A and the granulated slag manufacturing unit 200A. In 200B, the molten slag discharged from the outlet 112C or the outlet 112D is introduced.

  Of the four outlets 112 described above, two outlets 112 are alternately used (one of the outlets 112A and 112B, and the outlets 112C and 112D. In the configuration in which one of the outlets 112 is alternately opened, the number of the two outlets 112 that are not used is repaired with respect to one of the outlets 112. 120) and the other outlet 112 is dried and is on standby.

  However, in the case of increasing the output amount, etc., a configuration (three rotations) in which the three output ports 112 of the four output ports 112 are used in order (the remaining one output port 112 is used). In some cases, repairs are performed on the heel. For example, when adopting a configuration in which the tap outlets 112A, 112B, and 112C are used in order, a period during which the tap end of the tap outlet 112A and the initial tap output of the tap outlet 112B are wrapped (the tap outlet 112A and the tap out). There is a period during which the lap is taken out at the inlet 112B), and in the period when the lap is taken out, the molten slag discharged from the outlet 112A and the molten slag discharged from the outlet 112B are Both are introduced into the dry pit 160A or the granulated slag production unit 200A.

  The dry pit 160 gradually cools the molten slag to produce ballast (gravel). The granulated slag production unit 200 produces a granulated slag by quenching and crushing the molten slag.

  FIG. 2 is a diagram for explaining the granulated slag production unit 200. As shown in FIG. 2, the molten slag (shown in black in FIG. 2) falls from the ridge 150 into the granulated tub 210 and flows in. In addition, a large amount of pressurized water is sprayed from the granulated slurry generation unit (blowing box) 220 together with the inflow of molten slag into the granulated jar 210. In the granulated slag 210, the molten slag (about 1500 ° C.) is rapidly cooled to less than 100 ° C. and crushed by injecting pressurized water into the molten slag, and a granulated slurry (FIG. 5) is a mixture of the granulated slag and water. 2 are indicated by hatching). The granulated slurry thus produced is sent to the granulation tank 230.

  The granulating tank 230 temporarily stores the granulated slurry and separates water vapor from the granulated slurry. The granulated slurry from which water vapor has been separated by the granulation tank 230 is introduced into the invar filter 250 by the distributor 240.

  FIG. 3 is a view for explaining the invar filter 250, and is a cross-sectional view taken along the line III-III of FIG. As shown in FIG. 3, the invar filter 250 includes a cylindrical screen 252 in which an axial center is set in a horizontal direction and a plurality of holes are formed, and a drive unit (not illustrated) that rotates the screen 252. Consists of including. A plurality of holes 242 are provided in the lower surface of the portion of the distributor 240 that is disposed on the screen 252, and the granulated slurry (shown by hatching in FIG. 3) is substantially contained in the screen 252 by the distributor 240. It is uniformly dispersed and dropped, and the granulated slurry is dehydrated by the screen 252.

  Further, the screen 252 is provided with a plurality of scraping plates 254 erected from the inner wall of the screen 252 toward the center. The scraping plates 254 are rotated in accordance with the rotation of the screen 252 (counterclockwise in FIG. 3). The granulated slag (indicated by cross hatching in FIG. 3) is scraped and dropped onto the discharge conveyor 260. The granulated slag thus dehydrated by the inva filter 250 is discharged out of the inva filter 250 by the discharge conveyor 260 and falls from the inva filter 250 (water separated from the granulated slurry, shown in white in FIG. 3). ) Is stored in a water collection tank 290 provided below the inva filter 250.

  Returning to FIG. 2, the granulated slag (denoted by cross hatching in FIG. 2) dehydrated by the inva filter 250 and conveyed by the discharge conveyor 260 is supplied to the product tank 280 via the transport conveyor 270. The

  On the other hand, the water separated from the granulated slurry by the Inba filter 250 and stored in the water collecting tank 290 is introduced into the hot water tank 300 by overflow. Water (about 90 ° C.) introduced into the hot water tank 300 is sent to the cooling tower 320 by the hot water pump 310, and is cooled to about 50 ° C. to 60 ° C. in the cooling tower 320. The water thus cooled is circulated through the granulated slag manufacturing unit 200 by being returned to the granulated slurry generation unit 220 by the cold water pump 330.

  As described above, in the granulated slag production unit 200, granulated slag is produced, and in the dry pit 160, ballast is produced. Here, since granulated slag is more demanding than ballast, there is a desire to introduce the entire amount of molten slag into the granulated slag production unit 200. However, at the end of tapping or when lapping tapping, only one granulated slag manufacturing unit 200 may not be able to process the entire amount of molten slag. In this case, the delivery destination of the molten slag must be switched from the granulated slag production unit 200 to the dry pit 160, and the production efficiency of the granulated slag has been reduced. Therefore, in the present embodiment, by providing the sending means 400 that uses the granulated slag production unit 200 that does not perform the treatment of the molten slag, or is in the initial stage of tapping and has a sufficient amount of the granulated slag, Improve production efficiency of crushed slag. Hereinafter, the configuration of the sending means 400 will be described.

(Transmission means 400)
FIG. 4 is a view for explaining the delivery means 400 that constitutes the granulated slag production apparatus 170. As shown in FIG. 4, the delivery unit 400 includes a delivery pipe 410, a pump 420, a shut-off valve 430, and a slag control unit 440.

  The delivery pipe 410 (indicated by 410A and 410B in FIG. 4) is a pipe that connects the granulation tank 230 of the granulated slag production unit 200A and the granulation tank 230 of the granulated slag production unit 200B. The pump 420 (indicated by 420A and 420B in FIG. 4) causes the granulated slurry to flow through the delivery pipe 410. The shut-off valve 430 (indicated by 430A and 430B in FIG. 4) is provided on the upstream side of the pump 420 in the delivery pipe 410.

  The slag control unit 440 is composed of, for example, a semiconductor integrated circuit including a CPU (Central Processing Unit), reads a program, parameters, and the like for operating the CPU itself from the ROM, and serves as a RAM and other electronic circuits as a work area. In cooperation, the entire delivery means 400 is managed and controlled. In the present embodiment, the slag control unit 440 controls the pump 420 and the shutoff valve 430. Specific control processing of the pump 420 and the shutoff valve 430 by the slag control unit 440 will be described in detail later.

  In the delivery unit 400, for example, in the granulated slag manufacturing unit 200A, when the molten slag discharged from the outlets 112A and 112B cannot be processed, the slag control unit 440 opens the shut-off valve 430A and the pump 420A. Is driven to feed the granulated slurry from the granulated tank 230 of the granulated slag production unit 200A to the granulated tank 230 of the granulated slag production unit 200B.

  Thereby, the molten slag that cannot be processed in the granulated slag manufacturing unit 200A can be processed in the granulated slag manufacturing unit 200B, and the granulated slag can be processed without increasing the area of the screen 252 constituting the invar filter 250. It becomes possible to improve the manufacturing efficiency of the.

(Granulated slag manufacturing method)
Then, the granulated slag manufacturing method using the said granulated slag manufacturing apparatus 170 is demonstrated. FIG. 5 is a flowchart for explaining the flow of processing of the granulated slag manufacturing method. Here, the case where a lap is carried out at the spout 112A and the spout 112B will be described as an example. In addition, at the start of granulated slag production, the shutoff valve 430 is closed and the pump 420 is stopped.

  First, the granulated slurry production | generation part 220 of the granulated slag manufacturing unit 200A injects pressurized water into molten slag, and produces | generates a granulated slurry (granulated slurry production | generation process S110). And the invar filter 250 of the granulated slag manufacturing unit 200A dehydrates the granulated slurry generated in the granulated slurry generation step S110 to produce the granulated slag (granulated slag manufacturing step S120).

  Subsequently, the slag control unit 440 determines whether or not a predetermined switching condition is satisfied (determination step S130).

  Here, the switching condition may be, for example, that the weight of the granulated slag transported by the transport conveyor 270 is equal to or greater than a predetermined weight set value, or the torque of the screen 252 is equal to or greater than a predetermined torque set value. It may be.

  If the switching condition is not satisfied (NO in S130), the slag control unit 440 maintains the introduction of the granulated slurry from the granulation tank 230 to the inva filter 250 and ends the process of the granulated slag manufacturing method. .

  On the other hand, when the switching condition is satisfied (YES in S130), the slag control unit 440 opens the shut-off valve 430A (valve opening step S140), drives the pump 420A (pump driving step S150), and produces granulated slag. The granulated slurry generated in the unit 200A is sent to the granulated slag manufacturing unit 200B. And granulated slag manufacturing unit 200B dehydrates the granulated slurry sent out from granulated slag manufacturing unit 200A, and manufactures granulated slag (granulated slag manufacturing process S160).

  As explained above, by the granulated slag production method according to the present embodiment, the molten slag that cannot be treated in the granulated slag production unit 200A can be treated by the granulated slag production unit 200B. Manufacturing efficiency can be improved.

(Modification)
FIG. 6 is a diagram for explaining a sending unit 500 according to a modification. The delivery unit 500 of the modified example includes a buffer tank 510, an air discharge pipe 520, and a cleaning mechanism 530 in addition to the delivery pipe 410, the pump 420, the shutoff valve 430, and the slag control unit 440. Here, the buffer tank 510, the air discharge pipe 520, and the cleaning mechanism 530 arranged in the delivery pipe 410A will be described, and the buffer tank 510, the air discharge pipe 520, and the washing mechanism 530 arranged in the delivery pipe 410B will be described. The description is omitted because the functions are substantially the same.

  The buffer tank 510 is provided between the shut-off valve 430A and the pump 420A, and stores the granulated slurry. The delivery pipe 410A extending from the shutoff valve 430A is connected to the buffer tank 510, and the delivery pipe 410A extending from the pump 420A is connected to the lower part of the buffer tank 510. By storing the granulated slurry in the buffer tank 510, the air mixed in the granulated tank 230 can be separated from the granulated slurry. Further, an air discharge pipe 520 is provided on the upper surface of the buffer tank 510, and the air separated in the buffer tank 510 is discharged to the water granulation tank 230.

  With the configuration including the buffer tank 510, it is possible to prevent the introduction of air that could not be separated in the water granulating tank 230 into the pump 420A. Further, it is possible to prevent the introduction of air into the pump 420A due to a decrease in the level of the granulated slurry in the granulating tank 230. As a result, the pump 420A can be stably operated.

  The cleaning mechanism 530 includes a cleaning pipe 532 connected to the delivery pipe 410A between the shutoff valve 430A and the buffer tank 510, and a washing water pump 534 that supplies washing water to the delivery pipe 410A through the washing pipe 532. Composed.

  The granulation slurry is not always introduced into the delivery pipe 410A, but is introduced only when the switching condition is satisfied. Therefore, there is a possibility that the granulated slurry adheres in the delivery pipe 410A during the period when the granulated slurry is not introduced.

  Therefore, the configuration including the cleaning mechanism 530 allows the pumping pipe 410A, the pump 420A, the shutoff valve 430A, and the buffer tank 510 to be cleaned with cleaning water after the introduction of the granulated slurry is stopped. As a result, it is possible to prevent adhesion of the granulated slurry in the delivery pipe 410A, the pump 420A, the shutoff valve 430A, and the buffer tank 510.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to this embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Is done.

  For example, in the above embodiment, the example in which the delivery unit 400 includes the delivery pipe 410, the pump 420, the shutoff valve 430, and the slag control unit 440 has been described. However, the delivery means has a configuration as long as the granulated slurry generated by the granulated slurry production unit 220 of one granulated slag production unit 200 can be delivered to the invar filter 250 of another granulated slag production unit 200. There is no limitation.

  Moreover, in the said embodiment, the delivery piping 410 demonstrated and demonstrated the structure which connects the granulation tanks 230 as an example. However, it is only necessary for the delivery pipe to connect any portion (for example, the water granule 210 and the distributor 240) on the downstream side of the granulated slurry generation unit 220 and the upstream side of the invar filter 250.

  Moreover, in the said embodiment, although the sending means 400 demonstrated the structure provided with the cutoff valve 430, the sending means does not need to be provided with the cutoff valve.

  Moreover, in the said embodiment, although the blast furnace 100 of the 2 face cast floor was demonstrated, the blast furnace of a 3 face cast floor may be sufficient, for example. In any case, if a plurality of granulated slag production units 200 are provided, the delivery means 400 may use the granulated slurry produced by the granulated slurry production unit 220 of one granulated slag production unit 200 as the other. This can be sent to the INVA filter 250 of the granulated slag production unit 200, and the production efficiency of the granulated slag can be improved.

  Moreover, in the said embodiment, although the granulated slag manufacturing apparatus 170 demonstrated the structure provided with two granulated slag manufacturing units 200, three or more granulated slag manufacturing units 200 may be sufficient.

  Moreover, in the said embodiment, the molten slag demonstrated and demonstrated the structure guided to the granulated slag manufacturing unit 200 or the dry pit 160 as an example. However, in place of the dry pit 160, a bowl receiving method using a pot type that receives a pot using a pot may be adopted.

  Further, in the above-described embodiment, the rotary rod 152 has been described as an example of switching means for switching the introduction destination of the molten slag flowing through the rod 150 to the dry pit 160 or the granulated slag production unit 200. However, the switching means is not limited, and for example, a stopper for blocking the flow of the molten slag is provided in each of the dredger 150 communicating only with the dry pit 160 and the dredger 150 communicating only with the granulated slag production unit 200. The molten slag introduction destination may be switched to the dry pit 160 or the granulated slag production unit 200 by moving the stopper up and down.

  Although the case where the slag control unit 440 is configured by a semiconductor integrated circuit including a CPU has been described as an example, it may be a DSC, a PLC (Programmable Logic Controller), a relay panel, or the like. Moreover, the granulated slag manufacturing apparatus 170 may not include the slag control unit 440.

  INDUSTRIAL APPLICATION This invention can be utilized for the granulated slag manufacturing apparatus and granulated slag manufacturing method which manufacture granulated slag from the molten slag discharged | emitted from the blast furnace.

170 Granulated slag production apparatus 200 Granulated slag production unit 220 Granulated slurry generation unit 230 Granulated tank 250 Inverter filter 400 Sending means 410 Sending pipe 420 Pump 430 Shutoff valve 500 Sending means 510 Buffer tank

Claims (7)

A granulated slurry generating unit that generates water granulated slurry by injecting water into the molten slag discharged from the blast furnace body,
An invar filter for dewatering the granulated slurry to obtain granulated slag;
A granulated slag production apparatus comprising a plurality of granulated slag production units comprising:
A granulated slag comprising a sending means for sending the granulated slurry produced by the granulated slurry production unit of one granulated slag production unit to the invar filter of another granulated slag production unit manufacturing device. Each of the plurality of granulated slag production units includes a granulation tank that stores the granulated slurry generated by the granulated slurry generation unit and separates water vapor from the granulated slurry.
2. The granulated slag production apparatus according to claim 1, wherein the delivery unit delivers the granulated slurry in the granulation tank to the other granulated slag production unit.   The granulated slag manufacturing apparatus according to claim 2, wherein the delivery means connects the granulated tanks to each other. The delivery means includes
A delivery pipe extending from the downstream side of the granulated slurry production section in the granulated slag production unit according to 1;
A pump for circulating the granulated slurry in the delivery pipe;
The apparatus for producing granulated slag according to any one of claims 1 to 3, wherein The pump is provided in the delivery pipe,
5. The granulated slag manufacturing apparatus according to claim 4, wherein the delivery means further includes a shutoff valve provided on the upstream side of the pump in the delivery pipe. The delivery means includes
The apparatus for producing granulated slag according to claim 5, further comprising a buffer tank for storing the granulated slurry between the shut-off valve and the pump. A granulated slag production method using a plurality of granulated slag production units for producing granulated slag from molten slag discharged from a blast furnace,
1 in the granulated slag production unit, the step of injecting water into the molten slag to produce a granulated slurry;
Dehydrating the granulated slurry produced in the one granulated slag production unit in the one granulated slag production unit to produce granulated slag;
When a predetermined condition is satisfied, sending the granulated slurry generated in the one granulated slag production unit to the other granulated slag production unit;
Dehydrating the granulated slurry delivered from the one granulated slag production unit in the other granulated slag production unit to produce granulated slag;
The granulated slag manufacturing method characterized by including.

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