JP2009243707A - Slug cooling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slug cooling method for saving a space, and efficiently performing cooling treatment in a short time under good working environment. <P>SOLUTION: In this slug cooling method in which a slug supply opening 12 and a slug discharging opening 13 are respectively formed on an upstream-side end section and a downstream-side end section, the slug of high temperature is supplied to the slug supply opening 12 while rotating a metallic cylindrical cooling body 11 disposed while being tilted downward from an upstream side to a downstream side on its shaft center, and the slug indirectly cooled in the cylindrical cooling body 11 is discharged from the slug discharging opening 13, piping 31 for spraying cooling water into the cylindrical cooling body 11 is disposed, so that the cooling water is directly sprayed to the slug a temperature of 900°C or less conveyed in the cylindrical cooling body 11 to cool the slug. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a method for cooling slag generated from, for example, an ironworks.

Conventionally, the slag generated in the steel making process has been subjected to a cooling process in order to use it as an aggregate or a roadbed material, for example. In this cooling treatment, there are a method in which the generated slag is received in a slag pan (slag pan) and water is applied to the slag pan, and a method in which the generated slag is spread between vast soils and allowed to cool naturally.
However, when the slag is water-cooled, the slag contains a lime component, so the permeability of the cooling water is poor, and it takes time to cool the slag (for example, about half a day to one day), or the slag treatment There was a problem that a large number of slag pans were required depending on the amount. In addition, since slag is highly heat-insulating, when naturally cooling slag, it takes more time to cool the slag (for example, about 3 days), or a place to spread the slag must be secured. was there.
Therefore, for example, a method disclosed in Patent Document 1 is disclosed as a method for performing slag cooling processing in a short time in a space-saving manner. Specifically, it is a method in which a watering nozzle is attached from the inlet side to the outlet side in a cylindrical kiln, and the slag supplied into the kiln is sprinkled and cooled.

Japanese Patent Laid-Open No. 61-136942

However, since the slag supplied into the kiln has a high temperature of 1000 to 1300 ° C., when cooling water is sprayed from the watering nozzle to this slag, a water gas reaction occurs, and a synthesis gas of CO gas and H ₂ gas is generated. There is a risk that the working environment will deteriorate. Moreover, when molten iron and hot metal are mixed in high-temperature slag, there is a risk of causing a steam explosion.
And in order to cool this high-temperature slag, if water is sprinkled excessively with respect to the slag, the cooled slag contains a large amount of water. There is a problem that slag adheres and accumulates on the inner surface of the kiln discharge side.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a slag cooling method that can save space and can be efficiently cooled in a short time under a favorable work environment.

The gist of the present invention made to solve the above problems is as follows.
(1) A metallic cylindrical cooling body provided with a slag supply port and a slag discharge port at the upstream end and the downstream end, respectively, and inclined downward from the upstream side to the downstream side, In the slag cooling method of supplying high-temperature slag to the slag supply port while rotating about the axis, and discharging the slag indirectly cooled in the cylindrical cooling body from the slag discharge port,
A pipe for sprinkling cooling water is disposed in the cylindrical cooling body, and cooling is performed by directly spraying cooling water to the slag having a temperature of 900 ° C. or less that has been transported through the cylindrical cooling body. A cooling method for slag, which is characterized.

(2) The temperature of the slag discharged from the slag discharge port is set within a range of 50 ° C. to 100 ° C., and the moisture content of the slag is set within a range of 8% by mass to 12% by mass. The slag cooling method according to (1), characterized in that it is characterized.
(3) From the position of the slag discharge port of the cylindrical cooling body to the upstream side of the cylindrical cooling body, the watering is 50% or less of the length of the cylindrical cooling body to the slag discharge port. The slag cooling method according to (1) and (2), wherein the slag cooling is performed in between.

(4) On the inner surface of the cylindrical cooling body, a plurality of scraping members that scrape the slag supplied into the cylindrical cooling body as the cylindrical cooling body rotates are provided on the cylindrical cooling body. The slag cooling method according to any one of (1) to (3), wherein the slag cooling method is provided with an interval in the circumferential direction.
(5) The slag cooling method according to any one of (1) to (4), wherein the slag is a slag containing a molten metal.

In the slag cooling method according to the present invention, the cooling water is directly sprayed to the slag whose temperature has been lowered to 900 ° C. or less by the watering pipe disposed in the cylindrical cooling body. Therefore, it is possible to improve the working environment by suppressing water gas reaction (that is, generation of synthesis gas of CO gas and H ₂ gas). Moreover, since the slag and the iron content to be mixed are below the melting point if the temperature is 900 ° C. or less and solidify reliably, there is no risk of steam explosion due to this high-temperature melt (molten metal and molten iron) and water. .

Also, when the moisture content of the slag cooled in the cylindrical cooling body is specified, the slag can be transported to the downstream process without generating slag, and without being sludged, and the workability is improved. it can.
Since defines the length of the watering pipe arranged in the tubular cooling body, with good working environment in which CO ₂ or H ₂ is not generated, it can facilitate adjustment of the cooling and the moisture content of the slag. In addition, when a large slag block enters from the inlet, if there is a pipe on the kiln inlet side, there is a great risk of damage to the pipe due to a drop collision, but this can also be avoided.
Furthermore, since a plurality of scraping members that scrape the slag along with the rotation of the cylindrical cooling body are provided on the inner surface of the cylindrical cooling body, the cooling of the slag and the mixing of water into the slag can be improved, and the inclusion of slag The moisture content can be adjusted with higher accuracy.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory view of a slag cooling device to which a slag cooling method according to an embodiment of the present invention is applied, FIG. 2 is a front sectional view of the slag cooling device, and FIG. It is explanatory drawing which shows the relationship between dust generation amount and conveyance belt adhesion amount.

First, a slag cooling device (hereinafter also simply referred to as a cooling device) 10 to which a slag cooling method according to an embodiment of the present invention is applied will be described with reference to FIGS. Will be described.
As shown in FIG. 1, the slag cooling device 10 has a cylindrical cooling body 11 made of metal (for example, made of stainless steel).
The cylindrical cooling body 11 is, for example, a cylindrical one having a length (hereinafter also referred to as a machine length) L of about 4 to 15 m and an inner diameter D of about ¼ to ½ of the length L. A slag supply port 12 is formed at the end, and a slag discharge port 13 is formed at the downstream end. A slag supply chute 14 is attached to the slag supply port 12, and a slag discharge chute 15 is attached to the slag discharge port 13. A dust collector (not shown) is installed at each of the slag supply port 12 and the slag discharge port 13.

Guide portions 16 and 17 are provided on the outer circumferences on both sides in the axial direction of the cylindrical cooling body 11, and the cylindrical cooling body 11 is placed on a fixed base (not shown) via the guide portions 16 and 17. It is rotatably supported by the installed guide rollers 18 and 19. The height levels of the two guide rollers 18 and 19 are different, and the cylindrical cooling body 11 is inclined downward from the upstream side to the downstream side (for example, 1 / 100 to 5/100).
In addition, a gear 20 is provided on the outer periphery of the axially central portion of the cylindrical cooling body 11, and this gear 20 is installed on a fixed base and screwed to a gear 22 that can be rotated by a drive motor 21. Yes.
Accordingly, the cylindrical cooling body 11 is rotated on the guide rollers 18 and 19 at a rotational speed of, for example, 0.5 to 7 times / minute (rpm) by operating the drive motor 21 and rotating the gear 22. , Can rotate around its axis.

Above the tubular cooling body 11, a pipe 23 for flowing cooling water on the outer surface of the tubular cooling body 11 is arranged along the axial direction of the tubular cooling body 11. A plurality of branch pipes 24 (for example, about 3 to 20 pieces) are attached at intervals from the base side to the front part of the pipe 23 to apply cooling water to the cylindrical cooling body 11. In addition, the piping 23 and each branch pipe 24 are provided with valves 25 and 26, respectively, so that the watering position and the amount of watering can be adjusted.
Here, by opening the valves 25 and 26 provided in the pipe 23 and each branch pipe 24 and sprinkling the cooling water from each branch pipe 24, the cooling water flows on the outer surface of the cylindrical cooling body 11. Then, the slag in the cylindrical cooling body 11 is indirectly cooled.
At this time, the cooling water dropped below the cylindrical cooling body 11 is collected in the cooling water receiving container 27. A drainage pipe 28 is connected to the cooling water receiving container 27, and a valve 29 attached to the drainage pipe 28 is opened, and the pump 30 is further operated to discharge to the downstream side. The discharged cooling water is preferably used again as cooling water after the temperature is lowered. Further, as the indirect cooling, instead of water spraying from the outer periphery, the cylindrical cooling body may have a two-layer structure, and the cooling water may be circulated through the inside (gap).

A pipe 31 for sprinkling the cooling water charged from the slag discharge port 13 is disposed in the cylindrical cooling body 11 on the slag discharge port 13 side.
A plurality of watering nozzles 32 for spraying the cooling water to the slag are attached to the watering pipe 31 in the cylindrical cooling body 11 with a gap.
The slag cooled by air cooling without sprinkling the cooling water on the upstream side of the cylindrical cooling body 11 generates dust in the state as it is. For this reason, it is possible to cool the slag by sprinkling the cooling water with the watering nozzle 32 to the air-cooled slag, and to add moisture to the slag, and to perform other steps without causing the slag to generate dust. Can be transported. Furthermore, the overall length of the cylindrical cooling body 11 can be shortened, and a more compact facility can be provided.

The sprinkling pipe 31 in the cylindrical cooling body 11 has a length L of 50 of the cylindrical cooling body 11 upstream of the cylindrical cooling body 11 with the slag discharge port 13 position of the cylindrical cooling body 11 as a base end. % Or less to the slag discharge port 13.
Here, the tip position of the water sprinkling pipe 31 is set to 50% or less of the length L of the cylindrical cooling body 11 because the water is cooled by heat radiation with the iron shell, as described above, This is because the temperature of the slag is lowered to a temperature lower than 900 ° C. at which the gas reaction occurs. When the watering pipe exceeds 50% of the length L of the tubular cooling body, the arrangement position of the watering pipe in the tubular cooling body goes too far upstream, and the cooling water is sprinkled on the high-temperature slag, If a gas reaction is likely to occur, and there is a possibility that molten iron or hot metal is mixed, a steam explosion may occur.

From the above, the water sprinkling pipe 31 in the cylindrical cooling body 11 is slag discharged from 50% or less of the length L of the cylindrical cooling body 11 with the position of the slag discharge port 13 of the cylindrical cooling body 11 as the base end. Although it arrange | positioned between the exits 13, Preferably a minimum is 20% and an upper limit is 40%. Here, when the base end position of the sprinkling pipe is less than 20% of the length L of the cylindrical cooling body, after the sprinkling, the rotation of the cylindrical cooling body until the slag and water are mixed and discharged. The distance may be shortened and the slag may be insufficiently hydrated and cooled. In addition, when the slag to be charged is at a high temperature, the tip position of the sprinkling pipe may be around 900 ° C. where the water gas reaction takes place even if it is 50% of the length L of the cylindrical cooling body. 40% is preferred.
Furthermore, in order to efficiently cool the slag, for example, it is preferable to adjust the number of watering nozzles 32, the water spraying angle of the cooling water sprayed from the watering nozzles 32, and the amount of water sprayed.
The number of watering nozzles 32 is, for example, about 3 to 20 (here, 3). For example, one row (or two or more rows) may be arranged linearly in the longitudinal direction of the watering pipe 31. However, it may be arranged in a zigzag shape.

In addition, the water spray angle of the water sprayed from the water spray nozzle 32 is preferably an angle in a direction opposite to the rotation direction of the cylindrical cooling body 11, but may be a forward angle. Further, although water is sprayed downward from the watering pipe 31, water may be sprinkled toward the side or upward of the watering pipe 31.
The amount of water sprayed from the nozzle 32 for water spraying is such that the temperature of the slag discharged from the slag discharge port 13 of the tubular cooling body 11 is within the range of 50 ° C. or higher and 100 ° C. or lower. Is 20 mass% or less, preferably 8 mass% or more and 12 mass% or less, and is adjusted within a range of 70 liter / min or more and 150 liter / min or less.

Thus, when the moisture content of the slag is 8% by mass or more, dust generation of the slag can be prevented. On the other hand, when the slag content is 12% by mass or less, the slag can be prevented from becoming excessively watery, and the transport belt Since the adhesion of the slag can be suppressed, the workability at the time of conveying the cooling slag is improved.
Here, in FIG. 3, 10 tons of slag cooled by a cylindrical cooling body (temperature range of 50 ° C. or more and 100 ° C. or less) is loaded on a dump truck (load bed height 1.2 m) and transported to a processing equipment yard. , Dumped (transferred) into the hopper provided in this processing equipment yard, and then cut out all the slag from the lower end of the hopper, belt conveyor (width: 1.5m, material: synthetic rubber, transport capacity: 15 tons / The result of having conducted the test which conveys 50m in time) is shown.

The slag-containing moisture content on the horizontal axis in FIG. 3 indicates the moisture content of the slag cooled by the cylindrical cooling body, while the dust generation amount on the vertical axis is determined when dumping from the dump truck bed into the hopper. Shows the concentration of dust flowing out from the upper end of the hopper, and the conveying belt adhesion amount on the vertical axis indicates the amount of slag adhering to the belt when the belt conveyor is stopped after conveying the entire slag by the belt conveyor. The integrated value of the amount of slag dropped from the return side belt is shown.
As can be seen from FIG. 3, when the moisture content of the slag is 0% by mass, the amount of dust generation is large. However, when the moisture content is up to 8% by mass, the dust generation is mostly subsided. However, the amount of adhesion to the belt gradually increased with an increase in the water content, and rapidly increased when the amount exceeded 12% by mass.
For this reason, the water content of the slag is 20% by mass or less, preferably 8% by mass or more and 12% by mass or less.

As shown in FIG. 2, a plurality of scraping members 33 that scoop up the slag supplied into the cylindrical cooling body 11 as the cylindrical cooling body 11 rotates are provided in the cylindrical cooling body 11. It attaches to the circumferential direction of the cylindrical cooling body 11 at equal intervals (for example, the angle of 3-10 degrees centering on the axial center of the cylindrical cooling body 11).
The scraping member 33 is a stainless steel pipe, and is linearly attached to the inner side surface of the cylindrical cooling body 11 over the entire length along the axial direction thereof. The scraping member may be made of a stainless steel plate, and may be attached to the inner surface of the cylindrical cooling body in a linear or spiral manner.
Further, the scraping member 33 only has to be able to scrape and drop the slag in the cylindrical cooling body 11 as the cylindrical cooling body 11 rotates. ) Is preferably 30 mm or more and 100 mm or less.

Then, the cooling method of the slag which concerns on one embodiment of this invention is demonstrated.
First, the drive motor 21 is operated, and the cylindrical cooling body 11 is rotated on the guide rollers 18 and 19 around the axis at a rotational speed of 0.5 to 7 times / minute (rpm), for example. . At this time, when the valve 25 provided in the pipe 23 is opened and the cooling water is sprinkled from each branch pipe 24, the cooling water falling from above the cylindrical cooling body 11 is removed from the cylindrical cooling body 11. Fall down along the surface. Further, by opening the valve 34 provided in the watering pipe 31, the water is sprayed to the slag discharge port 13 side in the cylindrical cooling body 11 by the watering nozzle 32.
Then, high-temperature slag is supplied to the slag supply chute 14.

Slag contains molten metal (for example, hot metal etc.), for example, desulfurization slag or blast furnace slag.
This slag has, for example, a temperature of about 700 ° C. or more and 1300 ° C. or less, becomes granular, and its size is, for example, about 1 mm on average and about 100 mm at maximum, and more than that, It is desirable to remove with a grizzly or sieve sorter. If the slag is not solidified, the slag must be supplied to the slag supply chute 14 after solidifying and pulverizing.
In this way, the slag supplied into the cylindrical cooling body 11 via the slag supply chute 14 is scraped up by the scraping member 33 in the cylindrical cooling body 11 and is gradually stirred downstream while being stirred. Move to.

At this time, on the upstream side in the cylindrical cooling body 11, cooling treatment is indirectly performed by cooling water sprinkling from the outside of the cylindrical cooling body 11 and stirring of the slag, and on the downstream side, from the watering nozzle 32 to the slag. The cooling process by the water cooling which sprays a cooling water directly is made. In addition, the residence time of the slag in the cylindrical cooling body 11 is about 8 to 20 minutes, for example.
Here, the sprinkling of the cooling water to the slag is performed on the slag having a temperature of 900 ° C. or less by air cooling. This is because if the cooling water is sprinkled on slag having a temperature exceeding 900 ° C., synthesis gas is generated by a water gas reaction (C + H ₂ O → CO + H ₂ ). For this reason, although the sprinkling of the cooling water to slag is performed with respect to the slag whose temperature became 900 degrees C or less, it is preferable to spray water directly with respect to slag of 850 degrees C or less, Furthermore, 800 degrees C or less.

On the other hand, if the temperature of the slag is lowered, the above-described water gas reaction can be suppressed. However, when water is sprayed after the temperature is lowered too much, it is necessary to lengthen the indirect cooling region. The captain becomes longer. Therefore, in order to prevent this, it is actually desirable to set the temperature to 500 ° C. or higher.
In addition, water vapor | steam reaction may occur also when water vapor | steam generate | occur | produces by sprinkling cooling water to slag, and this moves to the upstream in the cylindrical cooling body 11. FIG. Therefore, as described above, the dust collector disposed on the slag discharge port 13 side of the cylindrical cooling body 11 sucks and discharges the air in the cylindrical cooling body 11 to the outside, and the inside of the cylindrical cooling body 11 is negatively discharged. It is desirable to use pressure.

In this way, the slag cooled by the cooling water from the watering nozzle 32 is discharged from the slag discharge port 13 of the cylindrical cooling body 11 through the slag discharge chute 15.
The temperature of the slag discharged from the slag discharge port 13 is in the range of 50 ° C. or more and less than 100 ° C., and the moisture content of the slag is 20% by mass or less, preferably 8% by mass or more and 12% by mass. It is adjusted within the following range.
Then, for example, sieve selection is performed on the slag that has been subjected to the cooling treatment, and the slag is used as, for example, a sand substitute or a sintered raw material.

Next, examples carried out for confirming the effects of the present invention will be described.
Here, the slag cooling device having the configuration shown in Table 1 was used, and a test for cooling various slags was performed.

The operating conditions in which the test was conducted were to change the position of the direct cooling pipe (sprinkling pipe) that sprays cooling water directly onto the slag in the cylindrical cooling body and the flow rate of the cooling water sprayed from this direct cooling pipe. Set. The operation conditions and operation results are shown in Tables 2 to 4.

In addition, "slag temperature of the direct sprinkling water sprinkling start position" described in Tables 2 to 4 means that the thermocouple is in a cylindrical shape from the discharge port side of the cylindrical cooling body to the side of the cylindrical cooling body. It is the temperature measured by providing at intervals of 0.5 m in a range up to a position of 55% of the total length of the cooling body. Further, “CO gas generation” and “CO gas generation amount” were measured by a sensor (infrared absorption method) provided in a portion 20 m above the inlet. Then, the slag was charged by using a heavy machine (yumbo) at equal intervals according to the charging speed.

Examples 1-5 shown in Table 2 are the slag temperature (900 degrees C or less) of the sprinkling start position of direct cooling water, the temperature (50-100 degreeC) after cooling of slag, and the moisture content (8-12 mass%) ), The water sprinkling start position (50% or less) directly from the cooling water discharge port is the result of setting the conditions shown in the above-described embodiment of the present invention.
As is apparent from the operation results in Table 2, in the operation conditions of Examples 1 to 5, there was no dust generation when the slag after cooling was reversed with a truck and transferred to the hopper (when the truck was reversed), and the slag was The amount of adhesion to the transport belt to be transported was also a small amount of 0.1 ton or less.
In addition, the slag of Example 4 was hot metal dephosphorization, and the slag of Example 5 was a blast furnace steel with a relatively fine particle size. It was a result.

In Examples 6 to 9 shown in Table 3, the slag temperature at the direct cooling water sprinkling start position is set to the conditions shown in the above-described embodiment of the present invention. This is the result of setting the watering start position to be more than 50%. For this reason, the conveyance distance of the slag after throwing in to a cylindrical cooling body until the sprinkling by direct cooling water is started is short compared with Examples 1-5.
In these Examples 6 to 9, since the temperature before cooling of the slag (before supply to the cylindrical cooling body) was low (1000 ° C. or less), the slag temperature at the start position of the direct cooling water spraying was this short. Even at the transport distance, it was cooled to 900 ° C. or less, and no CO gas was generated by the water gas reaction.

However, since it takes a long time from the start of sprinkling with the cooling water directly until the slag is discharged, in Examples 8 and 9, the water content after cooling the slag is outside the above-mentioned condition range and excessive moisture. (Over 12% by mass). For this reason, there was no dust generation, but the amount of adhesion to the conveyor belt increased. In Examples 6 and 7, the temperature after cooling of the slag and the moisture content thereof were within the above-described condition range, and the amount of adhesion to the conveyance belt was small.
However, in Examples 6 to 9, since the tip of the watering pipe for directly spraying the cooling water is close to the inlet position of the cylindrical cooling body, the injected slag lumps and contacts the watering pipe. Also, the problem that the tip part was damaged occurred.
In Examples 10 and 11, the temperature before cooling of the slag is about the same as that in Example 1, but the amount of direct cooling water sprinkled is in a condition where there is excess or deficiency with respect to the amount of water sprayed in Example 1. This is the result of setting. As a result, the moisture content after cooling of the slag is outside the above-mentioned condition range and becomes no moisture (less than 8% by mass) and excessive moisture (more than 12% by mass). There has occurred.

Next, the comparative example shown in Table 4 will be described.
Since all of Comparative Examples 1 to 4 had a higher temperature before cooling the slag than Example 1, the slag temperature at the start position of the direct cooling water sprinkled was outside the above condition range (over 900 ° C). As a result, CO gas due to the water gas reaction was generated from the inlet. Further, in Comparative Examples 2 and 3, the moisture content after cooling of the slag is outside the above-described condition range (less than 8% by mass, more than 12% by mass), and in Comparative Example 4, the temperature after cooling of the slag is The above condition range was exceeded (over 210 ° C.), which caused dust generation during reversal or increased adhesion to the conveyor belt. In Comparative Example 4, since the temperature after cooling the slag was high (210 ° C.), it could not be conveyed.
From the above results, by using the method for cooling slag according to the present invention, the generation of CO gas, the generation of dust, and the adhesion to the conveyor belt due to the water gas reaction can be suppressed and further prevented, and the space can be saved. In addition, it was confirmed that the cooling process can be efficiently performed in a short time under a good working environment.

As described above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the matters described in the scope of claims. Other embodiments and modifications conceivable within the scope are also included. For example, the case where the slag cooling method of the present invention is configured by combining a part or all of the above-described embodiments and modifications is also included in the scope of the right of the present invention.
In the above embodiment, the case where the watering pipe is arranged on the slag discharge port side in the cylindrical cooling body has been described, but the watering pipe is arranged over the entire axial length in the cylindrical cooling body, You may adjust the sprinkling position of cooling water with the nozzle for watering to be used.

It is explanatory drawing of the slag cooling device which applies the cooling method of the slag which concerns on one embodiment of this invention. It is a front sectional view of the slag cooling device. It is explanatory drawing which shows the relationship between the moisture content of slag, the amount of dust generation, and the conveyance belt adhesion amount.

Explanation of symbols

10: slag cooling device, 11: cylindrical cooling body, 12: slag supply port, 13: slag discharge port, 14: slag supply chute, 15: slag discharge chute, 16, 17: guide part, 18, 19: Guide roller, 20: gear, 21: drive motor, 22: gear, 23: pipe, 24: branch pipe, 25, 26: valve, 27: cooling water receiving container, 28: drainage pipe, 29: valve, 30: Pump, 31: Pipe for watering, 32: Nozzle for watering, 33: Raising member, 34: Valve

Claims (5)

A metal cylindrical cooling body provided with a slag supply port and a slag discharge port at the upstream end portion and the downstream end portion, respectively, and inclined downward from the upstream side to the downstream side. In the slag cooling method of supplying high temperature slag to the slag supply port while rotating as a center, and discharging the slag indirectly cooled in the cylindrical cooling body from the slag discharge port,
A pipe for sprinkling cooling water is disposed in the cylindrical cooling body, and cooling is performed by directly spraying cooling water to the slag having a temperature of 900 ° C. or less that has been transported through the cylindrical cooling body. A cooling method for slag, which is characterized. 2. The slag cooling method according to claim 1, wherein a temperature of the slag discharged from the slag discharge port is set within a range of 50 ° C. or more and 100 ° C. or less, and a moisture content of the slag is 8% by mass or more and 12% by mass. A slag cooling method characterized by being within the following range. 3. The slag cooling method according to claim 1, wherein the sprinkling is a length of the cylindrical cooling body upstream of the cylindrical cooling body with the slag discharge port position of the cylindrical cooling body as a base end. The method for cooling slag is performed between 50% or less and the slag discharge port. The slag cooling method according to any one of claims 1 to 3, wherein the slag supplied into the cylindrical cooling body is attached to the inner surface of the cylindrical cooling body along with the rotation of the cylindrical cooling body. A method for cooling slag, wherein a plurality of scraping members to be scraped up are provided at intervals in the circumferential direction of the cylindrical cooling body. The slag cooling method according to claim 1, wherein the slag is a slag containing a molten metal.

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