JPS63222052A - Manufacture of water-granulated slag and apparatus therefor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention relates to a method and an apparatus for producing granulated slag using blast furnace molten slag as a raw material, and more specifically relates to granulated slag using a furnace front method. The present invention relates to a method for producing granulated slag and an apparatus therefor, which can selectively and efficiently produce hard granulated slag or soft granulated slag from raw materials using production equipment.

It is extremely important to make effective use of the blast furnace slag that is inevitably generated in the steel manufacturing process using a four-way blast furnace from the viewpoint of resource conservation and energy conservation. For this,
So-called granulated slag is produced by injecting high-pressure cooling water into blast furnace molten slag in front of the furnace to rapidly cool and refine the slag. This granulated slag is used for construction materials (aggregate for concrete 1 to 1) and for cement.In terms of physical properties, the former is hard and dense, and has a low mass per unit volume groove. In addition, in the latter case, it is required to be soft, have a high vitrification rate, and be highly reactive.

Zunawaji: There are many contradictory qualities required for granulated slag for fine aggregate and granulated slag for cement. On the other hand, the quality of granulated slag is significantly affected by the molten slag temperature, and in general, when produced by the front-of-furnace method, the slag is softer and amorphous (softer and amorphous) than the outside-of-furnace method due to the higher slag temperature. The probability of producing hard granulated slag that is easy to obtain and has a mass per unit volume groove of, for example, 1°45 kg/1 or more is extremely small.

However, recently, for economic reasons, there has been a movement to completely change the granulated slag manufacturing equipment from the outside-of-furnace method to the front-of-furnace method. came alive. For this purpose, in order to produce hard granulated slag by the furnace method, for example,
As disclosed in Japanese Patent No. 42327, an apparatus for producing hard granulated slag by sprinkling water on molten slag cooled on a rotating drano has been proposed.

In addition, JP-A-54-5499! As disclosed in Publication No. ing.

Furthermore, the present applicant has already published Japanese Patent Publication No. 54-37621.
An invention of a "water slag production device" has been proposed, which has been published in the No. is installed on the downstream side near the intersection of the driving water flow from the driving jet plate and the granulated water flow from the jet plate, and the impact plate is installed above the water flow line by a scattering device. Tonareiru.

The invention disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 57-42327 is a method for efficiently controlling the slag temperature when rapidly cooling molten blast furnace slag to produce hard granulated slag. However, there is a problem in that the equipment cost is high. , and the above-mentioned Japanese Patent Application Laid-Open No. 54-54995
The invention described in the publication greatly increases the cooling rate of molten slag by injecting slurry made by suspending powder such as powdered blast furnace slag or converter slag in blowing water to the molten blast furnace slag. It is characterized by,
There are problems such as concerns about wear of piping and pumps, and difficulty in adjusting the particle size of suspended solids, making it difficult to control operating conditions.

On the other hand, the applicant's previous invention, Japanese Patent Publication No. 54-3762
The device according to Publication No. 1 does not specify whether it is a front-of-furnace type or an outside-of-furnace type, but when this device is applied to a front-of-furnace type, the unit volume groove or mass is 1.45 kg/ 1
Although the above-mentioned hard granulated slag can be obtained, there is a problem that the particle size structure is biased towards the fine particle side due to the large impact energy.

Therefore, as described above, in view of the various problems in the conventionally known methods, the present invention solves these problems and uses granulated slag manufacturing equipment using the same furnace front method. To obtain an improved method and apparatus for producing granulated slag that can selectively and efficiently produce hard granulated slag or soft granulated slag at any time using blast furnace molten slag as a raw material. This is its purpose.

In order to achieve this object, the present invention will be described in detail later in the section of the description of the embodiments.
As shown schematically in the figure, molten slag S from blast furnace 1
When manufacturing granulated slag by injecting cooling water into the slag, an air-cooling nostle 3 for slow cooling is installed below the slag gutter 2 in order to slowly cool the molten slag S flowing down from the blast furnace 1 through the slag gutter 2. The water jet nozzle 4 for granulation, which has a nozzle opening that intersects the flow trajectory of the molten slag S, is installed so that its injection direction intersects the falling locus of the molten slag S. Placed at the bottom of the cold nozzle 3,
This achieves a sufficient contact effect between the molten slag S and the jetted cooling water, and pulverizes the slag into coarse particles. By adopting this type, the amount of air for slow cooling and the amount of water for blowing can be freely switched between two stages, and thereby the amount of air for slow cooling and blowing water can be adjusted in response to the fluctuation amount of molten slag S flowing out. Further, below the granulating water jet nozzle 4, a slurry consisting of the slag, which has been pulverized into coarse granules by the action of this nozzle 4, and cooling water is placed in a U-shape. A driving water jet nozzle 5 is installed to push the slurry downstream of a downwardly tapered groove-shaped granulating gutter 30 having a cross section of . In order to further harden the granulated slag in the slurry directed downstream in the gutter 30, the slurry is designed to promote sufficient contact between the granulated slag and the cooling water in the slurry. A scattering device 19 is provided inside the granulated slag gutter 30, which is the flow path of Above the fracking trough 30 and spaced apart therefrom, first and second upper jet water nozzles 6.7 are installed, the former on the upstream side with respect to the flow of the slurry. When producing soft granulated slag by installing the granulation gutter 30 at intervals in the length direction, relatively high pressure water is injected from the granulation water nozzle 4 at the same time. The first upper water injection nozzle 6 also injects relatively high pressure cooling water into the molten slag S.
This is to inject the liquid in the direction of the flow trajectory. In addition, in the case of manufacturing hard granulated slag, the first upper water injection nozzle 6 is closed, and the second upper water injection nozzle 7 injects cooling water at a specific axially low pressure to produce granulated slag. In order to further rapidly cool the slag and to produce soft granulated slag, the first upper water injection nozzle 6 injects relatively high-pressure cooling water as described above; The upper water jet nozzle 7 is to be closed.

With the apparatus of the present invention having such a configuration, while using the same granulated slag manufacturing equipment, it is possible to adjust the water pressure of the granulation injection water, the water pressure of the upper injection water, etc. during granulated slag blowing to an arbitrary range. This makes it possible to selectively and efficiently produce hard granulated slag for concrete fine aggregate or soft granulated slag for cement at any time and with high efficiency.

In contrast, we will take an example of an outside-furnace type granulated slag production facility, where it is said that adjusting the water pressure and water volume during granulated slag blowing is relatively easier than in the front-of-furnace type granulated slag production equipment. At first glance, in conventional granulated slag manufacturing equipment, the water supply main pipe, granulation pipe, drive pipe, and upper pipe are simply branched, so the amount of blowing water can be reduced. When the water pressure and water amount are constant, there is a limit to the balance adjustment of the water pressure and water amount, but according to the present invention, each water injection nozzle 4.
Nozzle adjustment valves 1.5 and 16 are provided in the piping section for 5,
Furthermore, the water jet nozzles for granulation and driving have a double structure, and each is provided with a bypass for adjusting the water amount and water pressure, and a flow path switching side valve is installed in the bypass belonging to these jet water nozzles 4 and 5. By providing 11.12 and further installing flow path switching valves 13.14 in each piping for the first and second upper water injection nozzles 6.7, any water pressure (water amount) can be obtained. This is how it was done.

That is, in order to keep the blowing water amount constant and reduce the blowing water pressure, a part of the blowing water is released into the piping for the second upper jet water nozzle 7, and the piping for the granulating jet water nozzle 4 and the first By reducing the amount of water sent to the piping for the upper water injection nozzle 6, the water pressure in the piping for the granulating water nozzle 4 and the water pressure in the piping for the first upper water injection nozzle 6 can be reduced, Also, conversely,
In order to obtain high-pressure blown water, the second upper jet water nozzle 7
The valve 14 of the piping for the granulation water nozzle 4 is closed, and the entire amount of blowing water is sent to the pipe for the granulating water jet nozzle 4 and the pipe for the first upper water jet nozzle 6, thereby increasing the water pressure in each part.

In addition, the granulated slag 30 is equipped with a scattering device 19 and an impact plate 2o for promoting sufficient contact between the granulated slag and the cooling water, and the cross section of the granulated slag 30 is tapered into a U-shape. This groove structure makes it possible to produce granulated slag with the required quality and physical properties.

Dog L-Example □ Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 4 of the accompanying drawings showing one embodiment of the apparatus.

First, with the intention of achieving the object of the present invention, the present inventor has repeatedly studied and experimented on various factors during the production of granulated slag, and has found that the water pressure of cooling water during granulated slag blowing. It was found that there is a close correlation between the weight per unit volume, the particle size, and the cracking rate.

The findings are now shown in diagrams as shown in Figures 2.3 and 4.

Of these diagrams, Figure 2 is a correlation diagram between the granulation water pressure and upper water pressure during granulated slag blowing and the unit volume weight and mass, and Figure 3 is the correlation diagram between the granulation water pressure and upper water pressure during granulated slag blowing. It is a correlation diagram between water pressure and particle size.

As can be seen from these Figures 2 and 3, the cooling rate is adjusted at the end of the granulated slag 30, and the cooling process of the molten slag for producing hard granulated slag is performed in three stages. Change the slag temperature from high heat to crystal nucleation temperature 1
, 400℃ to 1,350℃ by wind cooling, and in the second stage, 0.6kgf/cm2 to 0.8kgf
Diffusion and semi-solidification into coarse particles with low pressure water injection of /c+n2, then 2.0 kgf/c+n2-2.5 kHz
/cm2 of high-pressure water is injected, and in the third stage, it is placed in the granulation gutter, and the splashing device 19 pulverizes high-temperature water and gives a stirring collision effect to the slurry.
By cutting the slag into coarse particles and rapidly cooling it with water sprayed from the top, the generation and hearing of air bubbles in the particles is suppressed, the growth of lime silicate crystals is stopped, and furthermore, sufficient contact between the granulated slag and water is ensured. By adopting a granulating gutter 30 equipped with a scattering device] 9 and an impact plate 20 and a U-shaped tapered groove in the cross section of the granulating gutter 30, high-quality coarse particles can be dispersed. It has been found that hard granulated slag can be stably produced.

In this way, according to the present invention, the Japanese Industrial Standard J
IS regulation unit volume weight mass 1.45kg/1
It is possible to obtain granulated slag that satisfies the above values, has a large and dense mass per unit volume, and has a particle size F M = 3.40 to 3.60 as a fine aggregate for concrete. . In addition, as can be seen from the correlation diagram between the water pressure of each part and the granulated slag vitrification rate shown in FIG.
2 to 3.0 kgf/e+o2, the water pressure in the granulating water jet nozzle 4 to 0.8 kB47cm"-1,2 kgf/c+n
It has been found that when the granulated slag is adjusted to a range of 2 and blow-formed, the vitrification rate of the granulated slag becomes 98% or more, and a high-quality granulated slag for cement can be obtained. It is well known that the vitrification rate of granulated slag has a correlation with its latent hydraulic properties, and that granulated slag with a high vitrification rate exhibits significant latent hydraulic properties. In other words, in order to produce granulated slag for hard concrete bones, cold air is blown onto molten blast furnace slag to lower the slag temperature as much as possible, and low-pressure cooling water is injected to granulate the slag. , sufficient contact with water may be promoted, and high-pressure cooling water may be used to produce soft granulated slag for cement. In this way, the difference between granulated slag for concrete fine aggregate and granulated slag for cement is determined by the difference in temperature of molten blast furnace slag and the difference in blowing water pressure during the manufacturing process of granulated slag. , conventionally,
It was considered difficult to arbitrarily produce two types of granulated slag using the same equipment. That is, in the conventional production of granulated slag, the granulated slag production equipment was equipped with a dedicated blowing nozzle plate, and the blowing water pressure and water volume were also fixed within extremely narrow ranges. Until now, it has only been possible to produce either granulated slag for fine bones or granulated slag for cement.

FIG. 1 schematically shows an embodiment of the granulated slag manufacturing apparatus according to the present invention, which was completed based on the above knowledge. A molten slag gutter 2 is installed at the bottom of the outlet so that the tip thereof is inclined downward, and at the bottom of this molten slag gutter 2, a slow cooling air cooling nozzle 3, a granulating water jet nozzle plate 4, and a molten slag gutter 2 are installed. Driving water jet nozzle plates 5 are arranged one after another at intervals and substantially parallel to the molten slag gutter 2 and each other, and each nozzle 3 is arranged above the lower end of the molten slag gutter 2 on the outside.
, 4.5, the first upper water injection nozzle 6 and the second upper injection water nozzle 7 are aligned with each other in the longitudinal direction of the molten slag trough 2 with their nozzle openings facing downward. Arrange them in this order with intervals between them. Further, among these nozzles, high-pressure air is supplied to the slow cooling air cooling nozzle 3 through a pipe via a blower 8, and the granulating water jet nozzle 4, the driving water jet nozzle 5, and the water jet nozzle 5 for driving. First and second upper jet water, nozzles 6 and 7
are supplied with pressurized water from a water source 50 via a pump 9 through a pipe line. In addition, the wind-chilled water nozzle 3 for gradual cooling, the jet water nozzle 4 for granulation, and the jet water nozzle 5 for driving are each formed in a double box structure with a bypass, so that the amount of ejected air or the ejected Mercury can be increased in two stages. In order to enable this switching, each conduit or bypass is equipped with
Flow path switching electric valve 1. O, 1, 1 and] 2 are installed, and flow M regulating valves 13 and 14 are respectively arranged in the pipes for the first and second upper water injection nozzles 6.7. Furthermore, manual valves +5.1.6 and 17.18 for fine flow rate adjustment are also attached to these conduits, respectively. Further, at the bottom of the drive water injection nozzle 5, a slurry made of a mixture of pulverized slag and cooling water is applied to the drive water so as to extend forward from the lower end of the slag gutter 2. A water crushing gutter 30 for guiding water jetted from the water jetting nozzle 5 downward to the front is arranged to be inclined downward, and this gutter 30 has a U-shaped spiral cross section. In addition, a scattering device 19 that is inclined to one side is installed at a distance from the driving water jet nozzle 5 in the longitudinal direction inside the downstream part, and a scattering device 19 that is inclined to one side The impact plate 20 is inclined within the inclined plane connecting the nozzle openings of the first and second upper water injection nozzles 6.7 to the fracking gutter 30. is set up. In addition, in the scattering path of the slurry containing granulated slag that is scattered obliquely upward from the inclined surface of the scattering device 19, a thermometer 19 and a thermometer 21 for measuring the temperature of the slurry are installed. The thermometer 21 is connected to the thermometer 21 to adjust the speed of the blower 8 and the pump 9 according to the measured temperature. for,
Governors 23, 24 for the blower 8 and the pump 9 are respectively connected. In addition, the wind cooling nozzle 3 for slow cooling
Flow path switching motor-operated valves 10 and 1 attached to the pipelines of the particle jet water nozzle 4 and the driving jet water nozzle 5
．． 1 and 12 are relays 25.1 and 12 for operating them.
26 and these relays 25.26 are connected to
Ammeter 2 with relay attached to blower 8 and pump 9
7 and 28, and the signals from these actuate the relays 25.26, which actuate the electric valves 10, 11.1.
2 is now operated.

Furthermore, each pipe is equipped with a pressure gauge for indicating the water pressure inside each pipe, for example, a full 1ζ tube type pressure gauge 31°32.
．． 33 is installed.

The device of the present invention has the following general arrangement, and its operation will be explained next.

The blast furnace molten slag S supplied from the blast furnace 1 flows through the molten slag gutter 2, and is arranged below the molten slag gutter 2 through an air cooling nozzle 32 for slow cooling, a water injection nozzle 4 for granulation, and an injection water nozzle 5 for driving. The water flows down in front of the water and falls onto the fracking gutter 30. Granulation water jet nozzle 4 and driving water jet nozzle 5
The slag S is rapidly cooled and pulverized by the cooling water injected from the first upper injection water nozzle 6 and the second upper injection water nozzle 7 provided above the front part of the molten slag gutter 2.
The slurry is a mixture of granulated slag and cooling water. This slurry passes through the scattering device 19 and the impact plate 20, flows downstream of the granulated slag gutter 30 together with a large amount of water, and is sent to a classification tank for the next step. Water jet nozzle for granulation 4
The driving water injection nozzle 5, the first upper injection water nozzle 6, and the second upper injection water nozzle 7 are all installed in branch piping from the main water supply pipe, and each branch Manual valves 15, 16, 17, 18 for fine flow rate adjustment and Bourdon tube type pressure gauge 3 provided on piping members, respectively.
Based on the instructions in 1.32, 33.34, voluptuous 15.1
By making the adjustments in 13.17.18, the water jet nozzle for granulation 4. The water pressure and amount of water supplied to the drive water jet nozzle 5 and the first and second upper water jet nozzles 6.7 can be adjusted. Note that the first and second upper water injection nozzles 6.7 have the role of a bypass circuit for spraying water, and the nozzle spraying water pressure of the granulation injection water nozzle 4 and the driving injection water nozzle 5 is When lowering the flow rate, open the electric valve 14 for switching the piping flow path for the second partial water injection nozzle 7 to prevent excess water from escaping from the second upper water injection nozzle 7. Just do it. Note that the first upper water jet nozzle 6
As a result of various experiments, we found that the optimum positional relationship of the piping for
+n In front, the height from the bottom of the granulated slag gutter 30 is 1.
3 to 1,510 mm (it is appropriate to hang the water nozzle 6 in the range of It was found that it is desirable to adopt

Next, regarding the positional relationship of the second upper water jet nozzle 7, it is appropriate to provide it within the range of 1.0 to 1.5+n J1 flow from the front surface of the impact plate 20, and also to spray water in a jet shape. I also found that this is desirable.

Next, to explain the implementation of the "double granulated slag blowing setting conditions", depending on the product to be produced,
The pressure or flow rate of water injected into the first and second upper injection nozzles 6 and 7 is changed. That is, when blowing granulated slag for cement 1 to 1, the first upper injection water is injected from the nozzle 6, the injection from the second upper injection water nozzle 7 is stopped, and the concrete fine aggregate is injected from the second upper injection water nozzle 7. When blowing granulated slag for water (J), the water is injected from the second upper water injection nozzle 7, and the injection from the first upper water injection nozzle 6 is stopped. Cooling air is blown out when blowing granulated slag, and stopped when blowing soft granulated slag.

Note that a variable speed motor is used as the electric motor for driving the blower 8 for the slow cooling air cooling nozzle 3, the granulating water jet nozzle 4, and the pump 9 for the driving water jet nozzle 5. Also, these nozzles 3, 4 and 5
It is preferable to use a jet with two stages of injection ports, such as a double jet. In other words, if the air volume or water volume decreases to 172 or less of the rated volume, spray from one of these two stages of nozzles, and if the air volume or water volume is 1/2 or more, , so that it is sprayed from two stages of nozzles. At this time, the temperature of the slurry containing the granulated slag that has been diffused and cooled by the air and water jetted from the air cooling nozzle 3 for slow cooling, the jetting water nozzle 4 for granulation, and the jetting water for driving is measured, When the water temperature of the slurry A exceeds the set value range and rises or falls 6, the speed of the air blower +fi 8 and pump 9 is increased or decelerated, thereby increasing or decreasing the air volume for cooling and the amount of water injected. . The electric motors of the blower 8 and the pump 9 are operated from the set points of their ammeters, and the electric motors of the electric valves 10, 11 . ．． 12 is 1 of the rated air volume or water volume
If the nozzle is 72 or less, it is closed, and if it is 172 or more, it is opened, and the amount of air or water sent to each two-stage nozzle 3, 4.5 is divided into 1 as shown in 1.

As described above, according to the present invention, granulated slag for concrete fine aggregate and granulated slag for cement can be produced by adjusting the molten slag temperature and the blowing water pressure of each nozzle 3, 4.5 using the same equipment. Thus, it is possible to produce two types of granulated slag with different quality and properties. Therefore, there is no need to set up separate equipment for producing granulated slag for concrete 1-M aggregate or granulated slag for cement, and all equipment except for some equipment can be shared. Therefore, it is possible to reduce equipment construction costs, operating costs, etc.

The device of the present invention has the above-described configuration and operates as described above, and an experimental example thereof will now be explained as follows.

Actual - Surprising Example - 1 As a result of operating with the conditions shown in Table 1 for the blowing of granulated slag for fine aggregate and granulated slag for cement, the results shown in Table 2 were obtained. Ta. As can be seen from this result, both of these numbers meet the Japanese Industrial Standard J
This satisfies the numerical values of granulated slag for fine aggregate and granulated slag for cement specified in IS, and it is confirmed that the present invention completely achieves the intended purpose.

As explained above, according to the method and apparatus for producing granulated slag according to the present invention, granulated slag for concrete fine aggregate can be produced using the same equipment. It is now possible to efficiently produce granulated slag and granulated slag for cement at any time, and since most of the components are shared, construction costs, operating costs, etc. are significantly reduced. Second, it exhibits many excellent effects such as high production volume of high-quality products.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing the overall arrangement of one embodiment of the apparatus of the present invention, and FIG. 2 is a diagram showing the relationship between the water pressure of each nozzle part during granulated slag blowing and the mass per unit volume of granulated slag. Figure 3 is a diagram showing the relationship between the water pressure of each nozzle part during granulated slag blowing and the particle size of granulated slag, and Figure 4 is a diagram showing the relationship between granulated slag blowing. It is a diagram showing the relationship between the water pressure of each nozzle portion during production and the vitrification rate of granulated slag. 1...Blast furnace, 2...Slag gutter, 3...Slow cooling ready wind nozzle, 4...Injection water nozzle for granulation, 5...Injection water nozzle for driving, 6.7...No. First and second upper water injection nozzles, 8...Blower, 9...Pump, 10, 11, 1
2.13...Electric valve for flow path switching, 13.14...
・Valve, 15.1B, 17.18... Active manual valve for flow rate fine adjustment, 19... Scattering device, 20... Shock plate, 21
...Thermometer, 30...Water gutter. =28- -Katsuo Kinuta r1 Procedural Amendment April 13, 1982

Claims (1)

[Scope of Claims] 1. In a method for producing granulated slag by injecting cooling water into blast furnace molten slag to rapidly cool and refine the molten slag, concrete slag is produced using the same blast furnace molten slag as a raw material. In order to differentiate between granulated slag for use in concrete and granulated slag for use in cement, in the case of producing granulated slag for use in concrete fine aggregate, a relatively low-pressure method is used to produce granulated slag for use in concrete, in contrast to the generally vertical flow trajectory of molten slag. A slurry consisting of coarse molten slag and water is formed by generally horizontally jetting the granulating jet water and the high-pressure driving jet water,
In this slurry, further downstream of the jet water for granulation,
In contrast, granulation is generally performed by injecting relatively low-pressure cooling water in the vertical direction, and in the case of producing granulated slag for cement, molten slag is generally pulverized in the vertical direction. With respect to the flow trajectory, relatively high-pressure granulation jet water and high-pressure driving jet water are generally injected in a horizontal direction, and at the same time, relatively high-pressure cooling water is generally injected in a vertical direction. 1. A manufacturing method comprising pulverizing molten slag into a slurry consisting of granulated molten slag and water. 2. In the production of granulated slag for concrete fine aggregate,
2. The manufacturing method according to claim 1, wherein the molten slag is slowly cooled by injecting slow cooling air to the molten slag before the molten slag is sprayed with the granulating water. 3. In the case of manufacturing granulated slag for concrete fine aggregate,
Molten blast furnace slag at a crystal nucleation temperature of 1,400° to 1,3
It is slowly cooled to 50℃ by slow cooling air injection, and then cooled to 0.6~
After diffusing and coagulating coarse particles with low-pressure granulation jet water of 0.8 kgf/cm^2, 2.0 to 2.5 kgf/cm
A slurry consisting of high-temperature water granulation and cooling water is created using the high-pressure water jet in ^2, and this slurry is stirred and subjected to collision action to cut coarse particles into appropriate particles.Furthermore, low-pressure water jet is jetted onto this slurry. The manufacturing method according to claim 1 or 2, wherein the manufacturing method is rapidly cooled by cooling, suppressing the generation and expansion of air bubbles in the particles, and stopping the growth of lime silicate crystals. 4. In the case of manufacturing granulated slag for cement, molten blast furnace slag is granulated from vertically above with high-pressure water injection of 1.0 to 3.0 kgf/cm^2 and 0.8 to 1.2 kg
This is simultaneously pulverized by high-pressure granulation jet water of f/cm^2, and as a result, the vitrification rate of the granulated slag is 98.
% or more. % or more. 5. In an apparatus for producing granulated slag by injecting cooling water into the blast furnace molten slag to rapidly cool the molten slag and producing granulated slag, the falling molten slag is received near the molten slag outlet of the blast furnace. A slag gutter is provided in a substantially straight line with its front end sloping downward, and a slag gutter is installed at intervals below the front end of the slag gutter, its front end sloping downward. In addition, there is a space between the front end of the slag gutter and the rear end of the slag gutter to prevent slag from falling from the front end of the slag gutter. An air-cooling nozzle for slow cooling that has a nozzle opening that intersects with the flow locus for injecting air for slow cooling, a water jet nozzle for granulation for jetting cooling water, and a water jet nozzle for driving. They are arranged in steps from above in this order, and furthermore, above the granulating gutter, there is a nozzle opening that intersects almost perpendicularly to the flow trajectory of the slurry consisting of cooling water and molten slag flowing in the granulating gutter. spaced apart in this order from the front end of the molten slag gutter, having a first and second upper injection water nozzle for cooling water having an injection water nozzle for each of these cooling water; 1. A manufacturing device characterized in that a flow rate adjustment valve is arranged for adjusting the flow rate of cooling water from each nozzle. 6. The manufacturing apparatus according to claim 5, wherein the granulation gutter has a U-shaped cross section and a groove shape tapering downward. 7. In the granulation gutter, install a scattering device for scattering slurry containing molten slag downstream from the first upper water injection nozzle and upstream of the second upper injection water nozzle, and install a scattering device above the slurry. In the downstream part, an impact plate is arranged in the flow trajectory of the slurry scattered upward by the scattering device so that the molten slurry scattered by the scattering device collides with it. Manufacturing equipment. 8. The air cooling nozzle for gradual cooling, the water jet nozzle for granulation, and the water jet nozzle for driving each have a two-stage nozzle opening, and these nozzle openings are connected to the pipe line for each nozzle. 8. The manufacturing apparatus according to claim 5, 6 or 7, wherein switching is possible using an attached flow path switching valve. 9. A thermometer is arranged so as to have a temperature measuring part within the flow trajectory of the slurry consisting of molten slag and cooling water near the scattering device, and this thermometer supplies cooling water to each cooling water nozzle. Control of the blower for supplying compressed air to the common pump and air cooling nozzle for slow cooling, and control of the flow path switching valves of the air cooling nozzle for slow cooling, the water injection nozzle for granulation, and the water injection nozzle for driving. 9. A manufacturing apparatus according to claim 7 or 8, which performs the following. 10. Place the first upper water jet nozzle opening at a distance of 0.4 to 0.6 m from the front of the granulation jet water nozzle opening and at a height of 1.3 to 1.5 m from the bottom of the granulation gutter. A manufacturing apparatus according to claim 7, 8 or 9. 11. Connect the second upper water nozzle opening to the rear part of the shock plate.
．． Claims 7 to 1 provided at a distance of 0 to 1.5 m
The manufacturing device according to any one of item 0.