KR100356158B1 - Device for manufacturing atomized slag - Google Patents

Abstract

PURPOSE: An apparatus for manufacturing granular slag is provided to effectively atomize molten slag, prevent recoagulation of slag in slag pan by effectively cooling the granular slag, effectively oxidize metallic constituents outflowed such as slag so that the metallic constituents become slag, and use the granular slag as a secondary resource. CONSTITUTION: In an apparatus comprising a hollow vertical cylindrical casing(10') at the upper part of which a tundish(12') for forming a conical channel(12a') is formed, and at the lower part of which a slag outlet(15') is formed; a slit(20') having long hole formed at the lower side of the tundish(12') of the casing(10'); a crushing tool(30') comprising a plurality of slit type air injection nozzles(32') inclined downward from the lower side of the tundish(12') of the casing(10'), a plurality of air injection nozzles(32') directed upward from the lower side of the casing(10') and a blower(34') for injecting high pressure air to the air injection nozzles(32') in order to primarily and secondarily crush slag (S') dropped to the lower part through the tundish(12'); and a slag pan(40') for receiving finely granulated slag from the lower part of the slag outlet(15') so that the apparatus manufactures small granular slag from molten slag, the small granular slag manufacturing apparatus further comprises an oxygen supplying device(50') comprising a nozzle mounted on one side of the lower part of the slag outlet(15') in a circumferential direction of the casing(10') and a blower(54') for supplying oxygen to the nozzle so that the oxygen supplying device(50') oxidizes thus removes metallic constituents by supplying oxygen into the finely granulated slag.

Description

Device for manufacturing atomized slag

The present invention relates to an apparatus for producing particulate slag, and more particularly, to effectively atomize molten slag, to effectively cool the atomized slag to prevent re-agglomeration in the slag pan, and slag The present invention relates to an apparatus for producing particulate slag, which is improved to effectively oxidize and slag outflowed metal components, and to have a particle size that can be applied to secondary resources such as dephosphorizer.

The types of slag generated in the current steel process are roughly divided into blast furnace slag and steelmaking slag. Blast furnace slag is classified into blast furnace slow cooling slag (blast furnace aggregate slag) and blast furnace slag according to the cooling method. Steelmaking slag is subdivided into converter slag, molten iron preliminary slag, furnace oxidized slag and reducing slag. These slag are currently used for blast furnace slag for cement and aggregate slag for road aggregate, while steel slag is partly due to the expansion due to free CaO component remaining in the slag. Although it is used as a salary material, most of it is in landfill. Therefore, in order to reduce the free CaO in steelmaking slag and to increase the utilization of slag, research and development on steam aging and the like are currently in progress.

Currently, slag treatment method generally collects molten slag, transfers it to the slag yard, sprays water, cools it, grinds it into a grinder, and now separates it into concentrate, slag, etc. Concentrates are recycled as raw materials for the sintering process, and slag is used for landfilling or sintering or cement raw materials depending on the particle size.

As can be seen from the above, the current method of processing steel slag is composed of a multi-stage process, such as slag collection, transportation, cooling, and crushing, and in particular, the multi-stage processing process has a problem in that it takes a lot of time and cost. In addition, it is very important to adjust the proper granularity for the use of slag as a secondary resource. Therefore, what is proposed in order to improve the problem by this multistep process is the wind-friction technique of Unexamined-Japanese-Patent No. 6-323759.

As shown in FIG. 7, the slag stream 110 discharges the molten slag stream 110 to one side of the electric furnace 100, and the high pressure air is discharged 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.

Accordingly, the present invention has been made in order to solve the above-mentioned conventional problems, the purpose is to effectively atomize molten slag (molten slag), and to effectively cool the atomized slag to prevent re-agglomeration phenomenon in the slag pan The present invention aims to provide an improved fine particle slag manufacturing apparatus which effectively oxidizes and exfoliates metal components, such as slags, to have a particle size that can be applied to secondary resources such as dephosphorizers.

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

2 is a plan view of the air spray nozzle according to the first embodiment of the present invention;

3 a) and b) are diagrams showing an air injection pattern for the molten slag stream to which the first embodiment of the present invention can be applied;

4 is a cross-sectional view of a particulate slag manufacturing apparatus according to a second embodiment of the present invention;

5 is an operational state diagram of a second embodiment of the present invention;

6 is a cross-sectional view of a particulate slag manufacturing apparatus according to a third embodiment of the present invention;

7 is a configuration diagram of a slag air freshening device according to the prior art.

※ Explanation of symbols about main part of drawing ※

10 ..... Casing 12 .... Tundish

15 ..... Outlet 30 ..... Crusher

32 ..... Nozzle 34 '.... Blower

40 ..... slag fan 50 ..... oxygen supply mechanism

S ...... Molten Slag Sa ..... Differential Slag

The present invention to achieve the above object,

A hollow vertical cylindrical casing having a tundish forming a conical flow path at an upper end thereof and a slag outlet formed at a lower end thereof;

A slit of a long hole formed in the tundish lower side of the casing;

Equipped with a plurality of slit-type air spray nozzles inclined downward from the tundish lower side of the casing, a plurality of air spray nozzles from the lower side of the casing to the top, and sprays the high pressure air with the air spray nozzle A crushing mechanism having a blower to crush the slag falling through the tundish to the lower portion for the first and second times; And,

In the apparatus for producing fine slag from the molten slag including; slag fan receiving the atomized slag at the lower portion of the slag outlet;

Mounting a nozzle in the circumferential direction of the casing at the lower side of the casing, and further comprising an oxygen supply mechanism having a blower for supplying oxygen to the nozzle to supply oxygen into the atomized slag to oxidize and remove the metal component By providing an atomizing slag manufacturing apparatus characterized in that the configuration.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The apparatus for producing atomized slag 1 according to the first embodiment of the present invention has a casing 10 having a vertical hollow shape, as shown in FIG. 1, which is a tundish for forming a conical flow path 12a at an upper end thereof. 12 is formed, the slag discharge port 15 is formed at the lower end, a long hole slit 20 is formed on the lower side of the tundish 12 of the casing 10, the lower side of the slit 20 The nozzle mechanism 30 is mounted. The nozzle mechanism 30 is disposed to face each other, and has a slit 20 type air spray nozzle 32 having a plurality of layers stacked up and down, and blows high-pressure air to the air spray nozzle 32 ( 34) to break the slag (S) falling through the tundish 12 to the lower portion between the air spray nozzles (32). The slit-type air spray nozzle 32 may have the same shape as the slit 20 of the tundish 12.

In addition, the slag outlet comprises a slag fan 40 that receives the slag (S) atomized in the lower portion of the outlet (15).

The first embodiment of the present invention configured as described above has the same shape as that of the air spray nozzle 32 positioned below the tundish 12 in discharging the molten slag S through the tundish 12. The discharge through the slit 20 (slit) type outlet. As described above, the molten slag S discharged through the slit 20 structure has a cooling effect transmitted to the inside of the slag S because the area in contact with the air discharged from the slit nozzles 32 opposite to each other is large. Because you can expect as large as possible.

In addition, the nozzle 32 designed under the tundish 12 has a slit 20 shape and is designed to be three consecutive steps in the vertical direction, the most important part of the first embodiment of the present invention. Becomes

Since the molten slag (S) stream discharged through the slit 20 of the tundish 12 is a high temperature of about 1,400 ~ 1,600 ℃, instantaneous contact with the air, which is the injection medium, pulverized and cooled and atomized For this purpose, it is very important to increase the contact area with the molten slag (S) stream. Therefore, a slit-shaped nozzle 32 having a size equal to or greater than the width of the molten slag S stream is preferred. In addition, since the molten slag S is difficult to be sufficiently crushed and cooled by the one-stage air nozzle 32 located immediately below the tundish 12, the air nozzles of two or three consecutive stages in the vertical direction ( It is preferable to position 32). It is because it is necessary to grind | melt the molten slag S which was not crushed by the 1st stage air nozzle 32 with the 2nd stage air nozzle 32, and to fully cool by the 3rd stage air nozzle 32.

When the fine slag S crushed by the slit-type air nozzle 32 is not sufficiently cooled, reaggregation occurs between the fine particle slag S collected in the slag fan 40, thereby assembling. Because it becomes. Therefore, the wind pressure sprayed from the nozzle located in the vertical three-stage form is preferably 500mm Aq / slag-kg or more.

When less than the wind pressure, the atomization and cooling of the slag (S) is insufficient, so that the granulation and reaggregation of the atomized slag (S) occurs. Therefore, the first embodiment of the present invention is to make the air pressure of the pressurized air to 500mmAq / slag-kg or more.

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

Example 1

Inventive Example 1a, 1b

3 kg of converter molten slag (S) is discharged through the tundish 12 outlet having a slit 20 shape of 3mm x 5mm, and the bottom is positioned three consecutive stages in the vertical direction with the same shape as the slit shape. The high pressure air nozzles 32 were respectively sprayed in the 45 ^o and 30 ^o directions for the slag S streams as shown in FIG. 3, and particulate slag Sa was collected in the slag pan 40 at the bottom thereof. . The particle size and aggregation phenomenon of the prepared slag (Sa) was measured and observed, and the results are shown in Table 1 below.

Comparative Example 1a, 1b, 1c

The high pressure air was injected in the 90 ^° direction to the slag stream through the first stage air nozzle 32 located below the tundish 12 and the air pressure was 1000 mmAq when the three stage nozzle 32 was used. , Except that 1300mmAq was carried out in the same manner as in Inventive Example 1 and the results are shown in Table 1 below.

Example 1 Operation condition Slag granularity Coagulation Nozzle Injection angle for slag Wind pressure (mmAq) 8mm or more 3mm ~ 8mm 3mm or less Inventive Example 1a 3-stage 45 ° " 13 10 77 radish 1b 3-stage 30 ° " 19 9 72 radish Comparative example 1a 1 stage 90 ° 1500 32 18 50 U 1b 3-stage 45 ° 1000 20 25 55 radish 1c 3-stage 45 ° 1300 20 20 60 radish

The method of Inventive Examples (1a, 1b) shown in Table 1 above, that is, the same slit-shaped nozzles as the tundish 12 were continuously positioned in three stages in the vertical direction to the molten slag stream at a wind pressure of 1500 mmAq. In the case of manufacturing by changing the high-pressure air injection angle for the, the change in the particle size did not appear significantly, it was confirmed that the slag (S) having a particle size of less than 3mm is produced about 70 ~ 75%.

However, as in Comparative Example 1a, when the spray angle was set to 90 ° and the nozzle in the first stage was used, the slag S having a particle size of 3 mm or less was about 50%, and the fine particles in the slag pan 40 The phenomenon of reaggregation between particles was observed. In Comparative Example 1a, the fraction having a particle size of 3 mm to 8 mm is much larger than that of the present invention, which is judged to be a result of the atomized slag S being not sufficiently cooled and collected by the slag pan 40 to reaggregate. do. In addition, it can be seen that in the case of Comparative Examples (1b and 1c) having a wind pressure of 1500 mmAq or less, many fractions having a particle size of 8 mm or more were produced in comparison with the invention example. This is judged to be a result of not sufficiently crushing the molten slag (S) stream into fine particles when the wind pressure is 500 mmAq / slag-kg or less.

From the above results, it can be seen that in order to manufacture the fine slag (S), it is very important to control the position of the nozzle and the air pressure to effectively crush the molten slag (S). As described above, the first embodiment of the present invention is very effective in controlling the granularity to be used as secondary resources by atomizing the slag (S).

4 and 5 show an apparatus for producing atomized slag 1 'according to a second embodiment of the present invention. The second embodiment of the present invention has a vertical cylindrical casing (10 '), a tundish (12') forming a conical flow path (12a ') is formed at the upper end of the casing (10'), slag at the lower end It has a hollow structure in which the outlet 15 'is formed. And a slag crushing mechanism having a long hole slit 20 'formed at the lower side of the tundish 12' of the casing 10 'and crushing the slag S' passing through the slit 20 '. 30 ', which is provided with a plurality of slit-type air jet nozzles 32' which are inclined downwardly from the lower side of the tundish 12 'of the casing 10', and the casing 10 '. And a blower 34 'for injecting high pressure air into the air spray nozzles 32' and 33 ', the plurality of air spray nozzles 33' being directed from the lower side to the upper portion of the tundish 12; It has a structure in which the slag (S ') falling through the') to be broken down over the primary and secondary.

In addition, a lower portion of the casing (10 ') has a nozzle 52' for supplying oxygen in the circumferential direction of the casing (10 '), blower (54') for supplying oxygen to the nozzle (52 ') A slag pan 40 'having an oxygen supply mechanism 50' for oxidizing the metal component in the atomized slag S 'and receiving the atomized slag S' at the lower part of the slag outlet 15 '. ) Is included.

In the second embodiment of the present invention configured as described above, the molten slag S 'flowing out from the tundish 12' is pulverized by high pressure air, and the fine slag Sa 'is lowered from the casing 10'. In the air or oxygen gas is injected into the vertical direction and the circumferential direction of the casing (10 ') to make secondary contact with the falling fine slag (Sa'). By injecting the high pressure air nozzle 32 'into the molten slag (Sa') stream discharged from the tundish (12 '), the crushing of the slag (S') by the instantaneous contact is predominantly performed. In addition, the atomized slag (Sa ') emits a lot of thermal energy because the specific surface area is large, but if the falling distance is short, it is not completely cooled even in the state collected in the slag fan (40') and contains some latent heat. If such latent heat is contained, the phenomenon of reaggregation between the atomized slag Sa 'occurs, which causes a problem that the recovery rate of the particulate slag Sa' is reduced.

Thus, the slag atomized by the upper pressurized air nozzle (Sa ') is the vertical direction and the circumference of the casing 10' at the lower side of the casing 10 'to give sufficient cooling time until it is collected in the slag pan 40'. Air or oxygen gas should be injected in the direction. In particular, the injection of oxygen gas is to provide a role of oxidizing the metal material to the oxide when molten steel is mixed.

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

Example 2

Inventive Example 2

3 kg of converter molten slag (S ') flows out through a tundish outlet having a slit (20') shape of 30mm x 5mm, and has a vertical three-stage nozzle (32 ') having the same shape as the tundish (12') at the bottom thereof. Pressurized air was injected in the direction of 45 ° with respect to the molten slag (S ') stream. The lower slag fan 40 'is sprayed with air and oxygen gas through a vertical lower part nozzle 33' and a circumferential nozzle 52 'positioned at a lower side of the casing 10', and a thermometer is mounted. ) Collected particulate slag (Sa '). The particle size of the manufactured slag (Sa ') and the temperature measured in the slag pan 40' was measured, respectively, and the results are shown in Table 2 below.

Comparative Example 2

In the same manner as in the above-described invention except that air and oxygen are not injected from the lower vertical yarn nozzle 33 'and the casing 10' circumferential oxygen nozzle 52 'on the lower side of the casing 10'. The results are shown in Table 2 below.

Example 2 Operating conditions Slag particle size (wt%) Slag Temperature Collected on the Fan Design of air in the lower part of container and oxygen injection nozzle 3mm or less 3mm ~ 8mm 8mm or more Inventive Example 2 U 90 6 4 50 ℃ or less Comparative Example 2 radish 82 13 5 200 ℃ or more

In the method of Inventive Example 2 shown in Table 2 above, that is, when air and oxygen are injected from nozzles 33 'and 52' located in the vertical direction and the casing 10 'circumferential direction on the lower side of the casing 10', Particles having a particle size of 3 mm or less showed about 90%, and the slag S 'collected in the slag pan 40' was sufficiently contacted with air or oxygen sprayed from the lower side of the casing 10 '. It could be confirmed that the cooling completely. However, when air and oxygen are not injected from the lower side of the casing 10 'as in Comparative Example 2, compared with Inventive Example 2, the particle size of 3 mm or less is small, but the slag S' is 3 mm to 8 mm or less. You can see that there are many fractions. This is because the molten slag (S ') stream is crushed by the air spray nozzle 32' positioned directly below the tundish 12 'and becomes fine, and then falls down while the particulate slag S is not sufficiently cooled. Due to the agglomeration caused by the collision between the ')', the fraction between 3mm and 8mm appears to be high. This can be inferred from the measurement of the temperature of the slag (S ') collected in the slag pan 40' from being collected without being completely cooled above 200 ℃.

From the above results, it can be seen that in order to effectively manufacture the fine slag (S '), it is very important to effectively cool the fine slag (S') pulverized by the high-pressure air nozzle.

6 shows a third embodiment of the present invention. The third embodiment has a hollow vertical cylindrical casing (10 "), the upper end is formed with a tundish 12" forming a conical flow path (12a "), the slag outlet (15") is formed at the lower end Is formed.

The long hole slit 20 " is formed at the lower side of the tundish 12 " of the casing 10 ", and the shredding mechanism 30 " is provided at the lower side of the slit 20 ". The shredding mechanism 30 "has a plurality of slit-type air spray nozzles 32" which are inclined downwardly and have a plurality of air spray nozzles 33 "directed from the lower side to the upper side of the casing 10". It is equipped with a blower (34 ") for injecting a high pressure air to the air injection nozzle (32") through the tundish (12 ") slag (S") to fall downward through the primary and secondary It has a structure that breaks down over.

It also has a cyclone 60 "mounted on one side of the casing 10", which collects particulate slag S "remaining and floating in the casing 10". On the other hand, a buffer plate 65 "is mounted below the upper side air spray nozzle 32", which is mounted in a conical structure so that the fine slag S "in the casing 10" is mounted. To prevent the reverse flow to the tundish 12 "side, and to supply oxygen in the circumferential direction of the casing 10" from the lower side of the casing 10 ", the metal component in the granulated slag (S") Oxygen supply mechanism (50 ") for oxidizing and the slag fan (40") receiving the atomized slag (S "at the bottom of the slag outlet 15".

The third embodiment of the present invention configured as described above further includes a cyclone 60 " and a buffer plate 65 " as compared with the second embodiment.

The molten slag S "flowing out from the tundish 12" is atomized by the high-pressure air of the crushing mechanism 30 ", and when it cools by the air spray of the lower side of the casing 10", the slag of the particulate form ( S ") are collected in a cyclone 60 " located on the side of the casing 10 ".

The molten slag (S ") discharged from the tundish (12") is produced by the granulated slag (Sa "of various sizes by the high pressure slit-type upper air nozzle (32"). At this time, when the air is sprayed through the lower air nozzle 33 "to cool the atomized slag (Sa") at the lower side of the casing (10 "), it is produced in the form of fine powder among the atomized slag (Sa"). They stay inside the casing 10 "and those with a certain size are collected in a slag pan 40" located underneath the casing 10 ". The slag fine powder is sucked from the cyclone 60 "positioned next to the casing 10" to collect the fine powder effectively.

In order to effectively collect the fine powders from the cyclone 60 ", a buffer plate 40" is installed at the lower end of the air nozzle 32 "located at the lower side of the tundish 12" so that the fine powders are tundished. 12 ") and to prevent the air blowing from the bottom of the casing 10" from rising. As described above, the slag (S ") in the form of fine powder collected in the cyclone (60") has an appropriate particle size or less, so that it can be applied to applications requiring a large specific surface area such as a dephosphor.

Hereinafter, a third embodiment of the present invention will be described in detail.

Example 3

Inventive Example 3

3 kg of converter molten slag (S ") flows out through a tundish 12" outlet having a slit shape of 30 mm x 5 mm, and a vertical three-stage nozzle 32 having the same shape as the slit 20 "at the bottom thereof. Pressurized air was injected in the 45 ° direction to the molten slag (S ") stream through " ", and a buffer plate 65 " was installed thereunder to prevent the rise of the fines and the lower side air. The high pressure air was injected through the nozzle 33 "located at the lower side of the casing 10", and the particulate slag Sa "was collected in the cyclone 60" and the slag pan 40 ", respectively. The particle size of the slag Sa ″ collected in the cyclone 60 ″ and slag pan 40 ″ was measured, and the results are shown in Table 3 below.

Example 3 Slag granularity Cyclone collecting slag Slag fan collecting slag Inventive Example 3 Less than 1mm 1mm or more ~ 20mm

As shown in Table 3 above, the slag Sa " collected from the cyclone 60 " located on the side of the casing 10 " is a slag fine powder having a particle size of 1 mm or less, in particular, requiring a large specific surface area. It can be confirmed that it has a particle size that can be applied as a secondary resource as a dephosphorization agent.

As described above, according to the present invention, the molten slag (S) (particulates) (S) (micronized) effectively granulates, and effectively cools the atomized slag (Sa) by preventing the reaggregation phenomenon in the slag pan 40, slag (S) ) And oxidized slag to effectively oxidize the slag, while the finely divided slag (Sa) has an improved effect to have a particle size that can be applied as a secondary resource such as a dephosphor.

Claims (3)

A hollow vertical cylindrical casing (10 ') having a tundish (12') forming a conical flow path (12a ') at its upper end, and a slag outlet (15') formed at its lower end; A long hole slit 20 'formed at the lower side of the tundish 12' of the casing 10 '; A plurality of slit-type air spray nozzles 32 'which are inclined downwardly from the lower side of the tundish 12' of the casing 10 ', Slag (S ') having an air spray nozzle (32'), and having a blower (34 ') for injecting a high-pressure air to the air spray nozzle (32') passing through the tundish (12 ') to the bottom Shredding mechanism (30 ') for shredding the primary and secondary crushing; And, In the apparatus for manufacturing the fine slag (Sa ') from the molten slag (S'); including a slag fan (40 ') receiving the atomized slag (Sa') in the lower portion of the slag outlet (15 '). In Mounting the nozzle 52 'in the circumferential direction of the casing 10' at one lower side of the casing 10 ', oxygen supply having a blower 54' for supplying oxygen to the nozzle 52 ' Apparatus (50 ') further comprises supplying oxygen into the atomized slag (Sa') is configured to oxidize and remove the metal component, characterized in that the apparatus for producing an atomized slag. The method of claim 1, further comprising a cyclone (60 ") mounted on one side of the casing (10") to collect particulate slag (Sa ") that remains and floats in the casing (10"). Atomizing slag manufacturing apparatus characterized in that. The conical structure is mounted to the lower portion of the upper side air spray nozzle (32 "), so that the fine slag (Sa" in the casing (10 ") is lifted back toward the tundish (12"). Apparatus for producing an atomized slag, characterized in that it further comprises a buffer plate (65 ") for blocking.

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