KR19990051962A - Atomized Slag Manufacturing Equipment - Google Patents

Abstract

The present invention can effectively perform the atomization of the slag by not undergoing a multi-step process and a crushing process, and can increase the recovery rate of the slag of the fine particles, and to make the secondary resources such as raw materials for sintering or cement raw materials, even in a small workplace. The present invention relates to an apparatus for producing atomized slag that can be easily manufactured to have a required particle size condition.

The present invention, the upper portion is formed with a tundish to form a conical flow path, the lower end of the hollow vertical cylindrical casing formed with a slag outlet; 1, which has a plurality of air spray nozzles inclined downward from the tundish lower side of the casing, and has a blower for injecting high pressure air into the air spray nozzles to crush slag falling down through the tundish. Differential grinding mechanism; Equipped with a rotating plate that rotates at a high speed in the lower side of the air injection nozzle, and equipped with a motor for driving the rotating plate, the slag accelerated primary and crushed by the air injection flow impacts the rotating plate to secondary crushing Secondary grinding mechanism; And a slag fan receiving the atomized slag at the lower portion of the slag discharge port.

Description

Atomized Slag Manufacturing Equipment

The present invention relates to an apparatus for producing atomized slag, and more particularly, it is possible to effectively perform the atomization of the slag by not undergoing a multi-step process and a crushing process, and to increase the recovery rate of the slag of the granules, and to provide the slag waste in a small workplace. The present invention relates to an apparatus for producing atomized slag that can be easily manufactured to have a particle size condition necessary for secondary resources such as sintering raw materials or cement raw materials.

At present, the slag generated in steel mill is transported to the slag yard, discharged, sprinkled and cooled, and then the slag is transported to the crushing mill to be crushed properly and separated into granules. The following (-8mm) is used as raw material for sintering and other auxiliary raw materials. In particular, when using as a raw material for cement or dephosphorization, it is necessary to manufacture in the form of fine powder.

As mentioned above, the current slag treatment process consists of multi-stages such as molten slag collection, transportation, cooling, and grinding. Especially, steelmaking slag is harder than blast furnace slag, and therefore, considerable investment in the grinding process in the current multi-stage treatment process The cost is due. In addition, the slag manufactured in the current multi-stage process has a problem in that it takes a lot of cost according to the grinding equipment and the grinding time since it should be less than 8 mm when used for sintering and fine powder when used as a dephosphor. .

Therefore, as described above, the multi-stage treatment process currently applied has a problem that not only requires a lot of equipment investment but also takes a long time to manage at an appropriate granularity. Proposed to improve the problems caused by such a multi-step process is the blowing technique described in Japanese Patent Laid-Open No. 6-323759.

5, the slag stream 110 discharges the molten slag stream 110 to one side of the electric furnace 100, and the high pressure air is passed through the air nozzle 105. The slag stream 110 is pulverized and atomized as the injection pressure of the air by spraying only in one direction perpendicular to the direction of the air. Therefore, the atomized slag 120 is cooled while being scattered in the atmosphere, and due to the surface tension of the slag 120 is a technology that allows the particles to be generated close to the spherical.

However, in order to apply such a windbreak technology, a problem arises that a fairly large workplace area is required. In order to solve the problem of the wind shattering technology, a system that can be applied even in a small area must be configured.

Therefore, the present invention is to solve the conventional problems as described above, the object of the present invention is not to go through the multi-step process and the grinding process, it is possible to effectively perform the atomization of slag, increase the recovery rate of the slag of the fine particles, even in a small workplace It is an object of the present invention to provide an apparatus for producing atomized slag that can be easily manufactured so as to have a granularity condition necessary for secondary resources such as sinter waste material or cement raw material.

1 is a cross-sectional view showing an atomizing slag manufacturing apparatus according to a first embodiment of the present invention;

2 is a block diagram of a rotating body provided in the apparatus for producing atomized slag of the first embodiment of the present invention;

3 is a block diagram of an atomizing slag manufacturing apparatus according to a second embodiment of the present invention;

4 is a cross-sectional view taken along the line A-A of FIG.

Figure 5 is a block diagram showing a wind blowing device according to the prior art.

※ Explanation of symbols about main part of drawing ※

10,10 '..... Casing 12,12' ..... Tundish

22,22 '..... Air Spray Nozzles 28,28' ..... High Pressure Blower

32 ...... Swivel plate 50 ...... Slag pan

S ..... Slag Sa ..... Undifferentiated Slag

In order to achieve the above object, the present invention provides a device for manufacturing atomized slag, the upper end is formed with a tundish to form a conical flow path, the lower end of the hollow vertical cylindrical casing formed slag outlet; 1, which has a plurality of air spray nozzles inclined downward from the tundish lower side of the casing, and has a blower for injecting high pressure air into the air spray nozzles to crush slag falling down through the tundish. Differential grinding mechanism; Equipped with a rotating plate that rotates at a high speed in the lower side of the air injection nozzle, and equipped with a motor for driving the rotating plate, the slag accelerated primary and crushed by the air injection flow impacts the rotating plate to secondary crushing Secondary grinding mechanism; And a slag fan that receives the slag atomized at the lower portion of the slag discharge port.

In addition, the present invention provides a device for manufacturing atomized slag, the upper end is formed with a tundish for forming a conical flow path, the lower end of the hollow vertical cylindrical casing formed with a slag outlet; A slit of a long hole formed in the tundish lower side of the casing; An upper nozzle mechanism having a plurality of air spray nozzles located at the lower side of the slit, and having a blower for injecting high pressure air into the air spray nozzles to crush slag falling down through the tundish; A lower nozzle mechanism having an air spray nozzle for secondaryly crushing the slag with air pressure while cooling the slag dropped through the upper nozzle mechanism, and having a blower for supplying air to the air spray nozzle; And a slag fan that receives the slag atomized at the lower portion of the slag discharge port.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated.

The present invention has a first embodiment as shown in Figs. 1 and 2 and a second embodiment as shown in Figs. 3 and 4. The atomizing slag manufacturing apparatus 1 according to the first embodiment of the present invention has a hollow vertical cylindrical casing 10, the casing 10 is a tundish to form a conical flow path (12a) at the upper end ( 12 is formed, and the lower end of the casing 10 has a structure in which a slag outlet 15 is formed.

And, the lower side of the tundish 12 of the casing 10 has a primary grinding mechanism 20 for crushing the slag (S) falling through the tundish 12 to the lower, the primary grinding In the mechanism 20, each air spray nozzle 22 is inclined downwardly, and the air spray nozzle 22 is formed by stacking a plurality of stages of injection holes 26 up and down on a circular frame 24. And a high pressure blower 28 for injecting high pressure air into the air spray nozzle 22 to crush the molten slag S passing through the tundish 12 and falling down the center of the nozzle 22. It is to let. In this case, the molten slag (S) is crushed as a high pressure air pressure injected in a downwardly inclined state at the same time as cooling, the secondary crushing mechanism 30 is mounted to the lower side of the primary crushing mechanism (20) It is provided with a rotary plate 32 which rotates at a high speed on the lower side of the air jet nozzle 22, and a motor 34 for driving the rotary plate 32 is provided on the outer side of the casing 10. The motor 34 is automatically adjustable by the controller (C).

In the secondary crushing mechanism 30, as shown in FIG. 2, the central portion of the rotating plate 32 forms a disk 32a, and the inclined inclined surface 32b of the conical shape toward the outer circumferential edge of the disk 32a. Is fulfilling. In addition, the rotating plate 32 has a lower central shaft 36 connected to the rotary shaft 34a of the motor 34 through the gearbox 38, and the central shaft 36 and the rotary shaft 34a are gearboxes. It is possible to be connected to each other via the bevel gear pair 39 in the (38). In addition, the gearbox 38 is fixed through the support 42 in the casing 10.

Therefore, the secondary crushing mechanism 30 is primarily crushed and accelerated slag (S) by the air injection flow of the primary crushing mechanism 20 collides with the rotating plate 32 and the secondary crushing as the impact pressure By the centrifugal force of the rotating plate 32 is to be further broken into fine particles. The slag fan 50 receives the slag atomized at the lower portion of the slag discharge port 15.

According to the first embodiment of the present invention configured as described above, the molten slag (S) discharged from the tundish (12) is first contacted with high pressure air to be crushed and again to the rotating plate 32 located below Contact and crushing and cooling at the same time. By contacting the high pressure air to the molten slag stream (SLAG STREAM) flowed out from the tundish 12, the crushing of the slag (S) by the instantaneous contact is dominant.

However, due to instantaneous contact by high pressure air, there is a large number of slags (S) falling into the assembled state without sufficient grinding. The slag (S) that is not crushed by the contact with the high-pressure air and the slag (S) of the assembly is in contact with the rotating plate 32 installed in the lower portion of the high-pressure air nozzle 22 to allow the grinding to proceed again. In this case, the atomized slag (Sa) is slowly dropped while being rotated by the centrifugal force of the rotating plate 32 is sufficiently cooled, is collected in the slag fan 50 of the lower through the slag outlet (15). However, in the above case, if additional cooling of the slag (S) is required, an air spray nozzle (not shown) for cooling them separately or a watering device (not shown) may be provided inside the casing 10. .

Therefore, in the first embodiment of the present invention, by placing the rotary plate 32 at the lower end of the high pressure air nozzle, the slag S and the slag S falling without being crushed by the high pressure air are crushed and cooled again. The recovery of fine slag (Sa) is to be increased.

Hereinafter, the first embodiment of the present invention will be described in detail through experiments.

(Example 1)

(Invention example 1)

3 kg of converter molten slag (S) was discharged to the bottom through tundish (12), and pressurized air was injected in the 45 ° direction to the molten slag (S) stream through the vertical three-stage nozzle (22) at the bottom thereof. . And rotating the rotating plate 32 located under the high-pressure air nozzle 22 at 1000rpm, measuring the particle size of the slag (S) collected in the slag fan 50 of the lower casing 10 is shown in Table 1 below It was.

(Comparative Example 1)

Except for not using the rotating plate 32 shown in Figs. 1 and 2 was carried out in the same manner as the invention example and the results are shown in Table 1 below.

Example 1 Operating conditions Generated Slag Particle Size (wt%) Less than 1mm 1mm ~ 3mm 3mm ~ 8mm 8mm or more Inventive Example One Rotating body use 60 38 2 - Comparative example One No rotating body 7 75 13 5

The method of Inventive Example 1 shown in Table 1, that is, the particle size of the slag (S) manufactured by designing the rotating plate 32 under the high pressure air nozzle is about 60% of less than 1mm, about 38% of 1mm ~ 3mm It can be seen that the manufactured slag (S) is mostly produced in a particulate state having a particle size of less than 3mm. However, when pulverized using only high pressure air without using the rotating plate 32, about 20% or more of 3 mm or more was produced.

In order to effectively atomize the slag (S) from the above results, by designing the rotary plate 32 at the lower end of the high pressure air nozzle 22, the slag (S) of the assembly and the slag (S) falling without being crushed by the high-pressure air It can be seen that it is very important to bring them into contact and to carry out grinding and cooling as their impact pressure.

As described above, the present invention is effective in increasing the recovery rate of the slag (Sa) of the fine particles by effectively performing the atomization of the slag (S).

3 and 4, the atomizing slag manufacturing apparatus 1 'according to the second embodiment of the present invention shown in FIG. 3 and 4 has a hollow vertical cylindrical casing 10', and is provided at an upper end of the casing 10 '. A tundish 12 ′ forming a conical flow path 12 a ′ is formed, and a slag outlet 15 ′ is formed at a lower end of the casing 10. And, it has a long hole slit 17 'formed at the lower side of the tundish 12' of the casing 10 ', the slit 17' is a ratio of the width (W) and the length (L) In other words, the width / length ratio is about 1/4 to 1/8.

In addition, the lower side of the slit 17 'has an upper nozzle mechanism 20', which is provided with a plurality of air spray nozzles 22 'which are stacked in a plurality of upper and lower stages, and the air spray nozzle ( 22 ') is provided with a blower (28') for injecting high-pressure air to crush the slag (S ') falling through the slit (17') to the bottom. In addition, the air injection nozzle 22 'is formed by stacking a plurality of injection holes 26' on a circular frame 24 '.

And a lower nozzle mechanism 30 'for secondary grinding of the slag S' by air pressure while cooling the slag S 'dropped through the primary grinding mechanism 20'. The mechanism 30 'has an air spray nozzle 32' disposed adjacent to the slag outlet 15 'of the casing 10', and the air injected from the air spray nozzle 32 'is directed upwards. It is to be arranged so as to have the effect of secondary crushing and cooling of the slag (S).

Moreover, the blower 34 'which supplies air to the said air injection nozzle 32' is provided in the outer side of the casing 10 '. The slag fan 50 'receives the slag S' atomized at the lower portion of the slag discharge port 15 '.

In the second embodiment of the present invention configured as described above, the molten slag S 'is discharged through the slits 17' under the tundish 12 'and the molten slag discharged through the slits 17' ( S ') is pulverized as a high pressure air nozzle 22', and the fine slag S 'pulverized as described above is cooled while the lower nozzle mechanism 30' is secondarily crushed.

Generally, the slits 17 'of the tundish 12' may be used in various ways, but a material having a constant viscosity such as slag S 'may be effectively applied by the air nozzle 22' of the subsequent stage. In order to grind | pulverize, it is most suitable to discharge through the slit 17 'which has a long length L and a narrow width W.

The molten slag stream discharged from the tundish 12 'having such a shape has a high contact area with the high-pressure air spraying body, and thus has high cooling and crushing efficiency delivered to the slag S', thereby producing fine powder. It is a very suitable form. Particularly, for a material having a constant viscosity such as slag S ', the size of the slit 17' is preferably about 1/6 of the width W / length L.

When crushing the molten slag (S ') with a high-pressure air nozzle 22' as described above, it is preferable to grind at a wind pressure of 500mmAq / slag (S) -kg or more. If the air pressure is less than the above, the molten slag (S ') is not sufficiently crushed, it is because the slag (S') atomization is impossible. In the method of cooling the atomized slag (S ') and the slag (S') that is atomized and dropped by blowing air from the air nozzle 32 'installed in the upper direction from the lower side of the vertical cylindrical casing (10') and Direct contact is preferred. The reason is that the fine slag S crushed by the air nozzle 22 'is cooled to some extent by air contact, but since it contains considerable thermal energy inside the slag S' particles, it reduces more thermal energy during the fall. It is necessary to prevent the phenomenon of forming large particles by reaggregating in the slag fan 50 '. In this case, the slag S 'may be crushed secondly by subtracting the pressure of the air injected from the lower nozzle mechanism 30'.

Hereinafter, a second embodiment of the present invention will be described in detail through experiments.

(Example 2)

(Invention example 2)

3 kg of converter molten slag (S ') is dropped through a tundish having a slit (17') shape of 30 mm x 5 mm, and at a pressure of 1,500 Aq and 2,000 Aq, respectively, through a high pressure air nozzle 22 'installed at the bottom thereof. Air was injected. Then, air was injected from the lower side of the vertical cylindrical casing 10 'to cool the slag (S') particles, thereby preparing fine slag (S ') particles. The particle size and aggregation phenomenon of the prepared slag (S ') was measured and the results are shown in Table 2 below.

(Comparative Example 2)

Instead of passing through the slit 17 'of the tundish 12', it is injected at a wind pressure of 1,000 mmAq, 1,300 mmAq through the high pressure air nozzle 22 'installed under the tundish 12' (tundish). Except that in the same manner as in Inventive Example 2 and the results are shown in Table 2.

(Comparative Example 3)

Except that the air was not injected through the lower nozzle mechanism (30 ') in the lower side of the vertical cylindrical casing (10') was carried out in the same manner as in Example 2, the results are shown in Table 2 below.

Example 2 Operating conditions Slag Particle Size (%) Coagulation Wind pressure (mAq) Air spray at bottom of container 3mm or less 3mm ~ 8mm 8mm or more Inventive Example 2a 1,500 U 60 25 15 radish 2b 2,000 U 70 18 12 radish Comparative example 2a 1,000 U 20 30 50 radish 2b 1,300 U 30 30 40 radish 3 1,500 radish 40 20 40 U

The method of Inventive Example 2a shown in Table 2 above, that is, the wind pressure 1,500 mmAq or more and the casing 10 'through the air nozzle 22' installed on the lower side of the slit 17 'of the tundish 12' (tundish). In the case where air is injected through the air nozzle 32 'installed at the lower side, the agglomeration phenomenon does not occur between the slag (S') particles collected in the slag fan 50 ', and the generated slag (S' ) It can be seen that less than 8mm particle size occupies more than 85%.

On the other hand, in Comparative Example 2a) having a wind pressure of 1,500 mmAq or less and Comparative Example 3 in which no air was blown to the lower side of the casing 10 ', only about 60% of particles of 8 mm or less were present. Particularly, in the case of Comparative Example 3 in which no air was injected from the lower side of the casing 10 ', a large part of particulate slag (S') particles collected in the slag pan 50 'was agglomerated and granulated. It was confirmed to be generated.

Judging from the above results, it can be seen that it is very important to effectively control the air pressure and cool the pulverized particles at the time of air injection in order to produce the fine slag (S ').

As described above, according to the present invention, by not undergoing the multi-step process and the grinding process as in the prior art, it is possible to effectively perform the atomization of the slag (S '), increase the recovery rate of the slag (Sa') of the fine particles, even in a small workplace It is possible to obtain an effect that can be easily manufactured so that the slag (S ') waste can have a particle size condition necessary for secondary resources such as raw materials for sintering or cement raw materials.

Claims (5)

An apparatus for manufacturing atomized slag, the upper end is formed with a tundish 12 for forming a conical flow path (12a), the lower end of the hollow vertical cylindrical casing (10) formed with a slag outlet (15); With a plurality of air spray nozzles 22 inclined downward from the lower side of the tundish 12 of the casing 10, and equipped with a blower 28 for injecting high-pressure air to the air spray nozzles 22 A primary crushing mechanism 20 for crushing slag S falling through the tundish 12 and falling downward; Equipped with a rotary plate 32 that rotates at a high speed on the lower side of the air injection nozzle 22, and equipped with a motor 34 for driving the rotary plate 32, the primary crushed and accelerated by the air injection flow A secondary crushing mechanism (30) for allowing the slag (S) to collide with the rotating plate (32) to be secondary crushed; And a slag fan (50) receiving the atomized slag (S) at the lower portion of the slag discharge port (15). The center portion of the rotating plate 32 forms a disk 32a, and forms an inclined inclined surface 32b on the outer circumferential edge side of the disk 32a, the rotating plate 32 having a lower end. The central shaft 36 is connected to the rotating shaft 34a of the motor 34 through the gearbox 38, and the central shaft 36 and the rotating shaft 34a are beveled gears inside the gearbox 38. 39) Atomizing slag manufacturing apparatus characterized in that connected to each other through a pair. In the apparatus for manufacturing atomized slag, a hollow vertical cylindrical casing (10 ') having a tundish (12') forming a conical flow path (12a ') at the upper end, a slag outlet (15') is formed at the lower end. ); A long hole slit 17 'formed at the lower side of the tundish 12' of the casing 10 '; The tundish having a plurality of air injection nozzles 22 'positioned at the lower side of the slit 17', and having a blower 28 'for injecting high pressure air into the air injection nozzles 22'. 12 ') an upper nozzle mechanism 20' for crushing slag S 'falling downward; While the slag (S ') dropped through the upper nozzle mechanism (20') is provided with an air spray nozzle 32 for secondary grinding of the slag (S ') with air pressure, the air spray nozzle (32') A lower nozzle mechanism 30 'having a blower 34' for supplying air to the air; And a slag fan (50 ') receiving the atomized slag (S') at the lower portion of the slag discharge port (15 '). 4. The apparatus of claim 3, wherein the upper nozzle mechanism (20 ') comprises a plurality of air spray nozzles (22') which are stacked in a plurality of upper and lower stages. 4. The apparatus of claim 3, wherein the slit (17 ') has a ratio of width (W) to length (L) of 1/4 to 1/8.