KR20100126918A - Furnace for melting slag and method for melting slag using it - Google Patents

Abstract

PURPOSE: A furnace for melting slag, which collects falling molten slag in a crucible, and a method for melting slag using the same are provided to steadily supply slag on time and to prevent the partial dissolution and agglomeration of slag. CONSTITUTION: A furnace for melting slag comprises a melting furnace(110), a melting furnace cover(130), a heating portion(300), a crucible(200) and a hopper portion(400). The upper end of the melting furnace is opened. The melting furnace cover is combined to the open top of the melting furnace. A ventilation path(132) is formed on the central part of the melting furnace cover. The heating portion heats the internal space of the melting furnace. The crucible is formed in the internal space. First slag is loaded inside the crucible. The hopper portion is separated in opened one side of the crucible. The hopper portion drops second slag to the crucible.

Description

Slag melting furnace and method for melting slag using it {Furnace for melting slag and method for melting slag using it}

The present invention relates to a slag melting furnace and a slag melting method using the same, and more particularly, to a slag melting furnace for dissolving slag more quickly in order to remove impurities from the slag and a slag melting method using the same.

In general, slag is a kind of mineral residue, which is generated as a by-product in various metal processing processes such as smelting and steelmaking to remove impurities of metals or ores. The slag serves to prevent the surface of the metal from being oxidized by air in the dissolved state of the metal or the ore and to protect the surface.

When the slag is cooled, mixed oxides of elements such as silicon, sulfur, phosphorus, aluminum, and the like are fused with limestone to form a coarse mass.

In the past, when slag was generated, it was mainly disposed of through landfill, but recently, slag, which was simply disposed of, was recycled due to cost reduction. To this end, it is required to dissolve the agglomerated solid slag and remove impurities. High-quality slag, which has undergone this impurity removal process, is used in various fields such as concrete, road pavement, and fertilizer.

Referring to the slag melting furnace and the slag melting method according to the prior art with reference to the accompanying Figure 1 as follows.

The inside of the conventional slag melting furnace 10 is provided with a crucible 20 in which solid slag S is contained and dissolved therein, and passes through one side of the slag melting furnace 10 and has an internal space F of the slag melting furnace 10. Heating means 30 for heating the air circulated at a high temperature is provided.

After such a large amount of slag (S) through the conventional slag melting furnace 10 is temporarily introduced into the crucible 20, the heating was made until all the slag (S) is injected.

However, according to the conventional slag melting furnace 10 and the slag melting method, since a large amount of slag S is heated in the crucible 20 at a time, the slag S having a low thermal conductivity is not easily dissolved. I couldn't. That is, even after heating for a predetermined time, only the outer slag (S _out ) that reached the dissolution temperature is mainly dissolved, the inner slag (S _in ) was maintained in the granular state.

In particular, the dissolved external slag (S _out ) is in close contact with the inner circumferential surface of the crucible 20 does not fall off to surround the inner slag (S _in ) to dissolve the total amount of slag (S; S _in , S _out ) required to dissolve The time was longer and a heating temperature higher than the usual dissolution temperature was required. As a result, the amount of energy required to dissolve the slag (S) is sharply increased, and the service equipment is exposed to high temperature for a long time, thereby shortening the service life.

In addition, as the dissolution time is delayed, there is a problem that the productivity of producing a good slag (S) is lowered.

In order to solve the above problems, the present invention is provided with a hopper for dividing the slag at the top of the crucible, by heating the crucible and the hopper in a thermal circulation method so that the slag contained in the hopper is dissolved and dropped into the crucible Provided is a slag melting furnace and a slag dissolving method using the same that can quickly dissolve the slag.

The slag melting furnace according to the present invention provides an inner space and the upper end of the melting furnace body, the melting furnace cover coupled to the open upper end of the melting furnace body and the exhaust passage is formed in the center, a heating unit for heating the inner space; The crucible is provided in the inner space and one side is opened and the first slag is charged in the interior and spaced apart from the open side of the crucible, the second slag is charged and the hopper portion for dropping the second slag into the crucible do.

In addition, the slag dissolving method according to the present invention comprises the steps of charging the first slag in the crucible provided in the slag melting furnace, installing a hopper portion above the crucible, charging the second slag into the hopper portion, Heating the crucible and the hopper, mixing the melted second slag with the melted first slag, and tapping the mixed slag from the crucible.

According to the present invention, it is possible to prevent partial melting and agglomeration of only the outside of the slag caused by the low thermal conductivity of the slag in the process of dissolving the slag. Therefore, excessive temperature rise is not required for slag dissolution and the dissolution time is shortened.

In addition, the energy required to dissolve the slag is saved, and it is possible to prevent the equipment from rapidly aging.

In addition, since the required amount of slag can be stably supplied in a timely manner, the productivity of the slag is increased, thereby reducing the cost through recycling the slag.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention in more detail. It will be apparent to those skilled in the art that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know. Like reference numerals in the drawings refer to like elements.

2 is a view showing the internal configuration of the slag melting furnace according to an embodiment of the present invention, Figure 3 is a view showing a hopper portion according to the present invention, Figure 4 is a view showing a modification of the hopper portion shown in FIG. .

2 to 4, the slag melting furnace 100 according to an embodiment of the present invention is a furnace body (furnace body 110) providing an inner space (F) in which the slag (S; S1, S2) is dissolved And a furnace cover 130 which is coupled to an open upper end of the furnace body 110 and has an exhaust passage 132 formed at the center thereof, a heating unit 300 that heats the internal space F, and an internal space. It is provided in (F) and one side is opened and the first slag (S1) is installed in the crucible 200 and the one side of the crucible (200) open spaced apart, the second slag (S2) is charged and the second It includes a hopper 400 to drop the slag (S2) to the crucible (200).

Here, the first slag S1 and the second slag S2 are classified according to the container in which the slag S is divided, and the first slag S1 and the second slag S2 are the same.

Melting furnace body 110 has an open top structure, the crucible 200 is seated in the empty interior space (F). To this end, a crucible pedestal 210 of refractory material is provided on the inner lower surface of the melting furnace body 110. The melting furnace body 110 may be firmly maintained even when the outer surface 112 is made of a metal material, and the inner surface 114 is made of a fireproof material such as a fire brick or the like for a long time in a high temperature environment.

The melting furnace cover 130 is coupled to an open upper end of the melting furnace body 110, and an exhaust passage 132 penetrated up and down is formed at the center of the melting furnace cover 130 to circulate air A in the interior space F. ) Is exhausted. On the other hand, the lower surface of the melting furnace cover 130 exposed to the internal space (F) is also subjected to the refractory treatment.

In this embodiment, the melting furnace body 110 is made in the same shape as the shape of the crucible 200, but when the shape of the crucible 200 is changed, it may be made in a variety of shapes, such as an elliptic cylinder shape, a polygonal pillar shape. Of course.

The heating unit 300 is a combustion means 310 for penetrating one side of the furnace body 110 to heat the internal space (F), and is coupled to the combustion means 310 to air into the internal space (F) A; Including air supply means for supplying and circulating (320). The combustion means 310 and the air supply means 320 is connected to a fuel supply means (not shown) and an air tank (not shown) provided on the outside of the furnace body 110.

In this embodiment, a burner is used as the combustion means 310, and the air A of the internal space F is heated to a high temperature by the flame generated from the burner. The heated hot air A circulates inside the melting furnace body 110 and inside the crucible 200 and is exhausted to the outside through the exhaust passage 132 formed in the melting furnace cover 130.

The hopper 400 is a container for dividing the slag S together with the crucible 200, and is easily mounted and separated from the exhaust passage 132 formed in the melting furnace cover 130 during the dissolution of the slag S. At this time, when the hopper unit 400 is mounted, the upper portion of the hopper unit 400 is located outside the upper side of the melting furnace body 110, and the lower portion of the hopper unit 400 is located in the inner space F of the melting furnace body 110. Partial inserts as much as possible.

The hopper 400 has a cylindrical shape that is vertically penetrated, and is inserted into a hopper 410 in which a plurality of first tapping holes 412 are formed along the circumference of the lower side, and inserted into a piercing area of the hopper 410. The second slag (S2) of the at least one plate (420; 420a, 420b) and the exhaust passage formed in the melting furnace cover 130 is coupled to protrude from the side of the hopper 410 to prevent falling immediately 132 includes a plurality of stoppers 430 supporting the hopper 410. In addition, a pair of moving ring grooves 450 facing each other are formed at an upper portion of the hopper 410 to be connected to a crane means (not shown) provided at an upper side of the hopper 410. do.

In the present embodiment, when looking at the vertical cross section, the inner diameter of the hopper 410 decreases toward the lower side, that is, the upper opening of the hopper 410 is formed in an equilateral trapezoidal shape that is larger than the lower opening. In order to increase the rate at which the slag S2 is dissolved and dropped, the slag S2 may be deformed into an equilateral trapezoidal shape such that the inner diameter becomes larger as it descends downward.

Meanwhile, a lower portion of the hopper 410 partially inserted into the exhaust passage 132 has an outer diameter smaller than the inner diameter of the exhaust passage 132 and the inner diameter of the crucible 200, and the plurality of first tapping holes 412 has an inner space. It is formed along the lower side of the hopper 410 exposed to (F). Therefore, the second slag S2 dissolved in the hopper 410 does not fall outside the crucible 200 but falls only inside the crucible 200.

A plurality of stoppers 430 are coupled to the outer surface of the hopper 410 to support the hopper 410 is partially inserted into the furnace cover 130. At this time, the plurality of stoppers 430 is firmly coupled to the side of the hopper 410 to withstand the total load of the hopper 410, at least one or more surface plate 420 and the second slag (S2) charged.

The stopper 430 may be freely deformed as long as the stopper 430 protrudes from the outer surface of the hopper 410. However, a plurality of stoppers 430 are in contact with the upper surface of the melting furnace cover 130 so that the hopper 410 does not tilt to one side with respect to the ground. In addition, the distance (L3) between both ends of the plurality of stoppers 430 protruding to both sides of the hopper 410 is formed larger than the diameter (L4) of the exhaust passage 132 formed in the furnace cover (130).

At least one platen 420 is formed of a plate-shaped body that is in contact with the inner circumferential surface of the hopper 410, each of the plate-shaped body is formed with a plurality of second tapping holes (422; 422a, 422b). In this embodiment, since the hopper 410 is used as the inner diameter decreases downward, the slope G is formed so that the side surface of the surface plate 420 is in close contact with the inclined inner circumferential surface of the hopper 410.

At least one surface plate 420 is used. In this embodiment, two partition spaces (2) are formed inside the hopper 410 using two surface plates 420, that is, the upper surface plate 420a and the lower surface plate 420b. E; E1, E2).

The diameters L1 and L2 of the upper surface plate 420a and the lower surface plate 420b are determined in proportion to the positions fixed in the hopper 410, that is, the heights H1 and H2 spaced apart from the lower end of the hopper 410. . In addition, the thicknesses t1 and t2 of the upper plate 420a and the lower plate 420b may vary depending on the amount of the second slag S2 charged in the hopper 410, that is, the load. In the present embodiment, the thickness t2 of the lower surface plate 420b is larger than the thickness t1 of the upper surface plate 420a so as to withstand the unexpected load change of the second slag S2.

In addition, the upper second tapping hole 422a formed in the upper surface plate 420a and the lower second tapping hole 422b formed in the lower surface plate 420b may be formed in a circular shape as in this embodiment, and the filling agent The slag S2 may be deformed into various shapes such as an oval or polygonal shape according to the lumped shape. The upper second tap 422a and the lower second tap 422b may be formed in different numbers, and may also be formed to have different diameters r1 and r2. In the present embodiment, the diameter r2 of the lower second tap 422b is smaller than the diameter r1 of the upper second tap 422a. That is, even though the second slag S2 passes through the upper second tapping hole 422a in the process of being charged into the hopper 410, the second slag S2 may be caught by the lower second tapping hole 422b.

On the other hand, unlike the present embodiment, when one surface plate 420 is inserted into the hopper 410, the interior of the hopper 410 forms one partition space (E). Therefore, due to the shape of the hopper 410, the inner diameter of which decreases downwards when the second slag S2 is charged, and the self load of the second slag S2 that is introduced into the second partition slag S2. The slag S2 is densely loaded. As a result, the area where the hot air circulated is in contact with the second slag S2 through the plurality of first tapping holes 412 and the plurality of second tapping holes 422 is reduced, thereby reducing the slag dissolution rate. Will decrease.

In addition, when the slag melting furnace 100 and the hopper 410 are large, it is preferable to increase the number of use of the surface plate 420. However, even though the hopper 410 is a normal size, there are too many surface plates in the hopper 410 When the 420 is inserted, the space in which the inside of the hopper 410 is divided up and down increases. As a result, when the second slag S2 is introduced into the open upper end of the hopper 410, it is difficult to smoothly introduce the second slag S2 to the partition space located at the lower side. In addition, the structure of the hopper unit 400 is complicated, there is a problem that the manufacturing cost, installation cost and maintenance cost of the surface plate 420 increases.

After the second slag S2 is charged into the spaces E1 and E2 formed by the hopper 410 and the plurality of surface plates 420 (420a and 420b), the first slab 412 and the plurality of first tapping holes 412 and It flows out through a plurality of second tapping holes 422. That is, when the second slag S2 is in a solid state, the first slab S412 and the plurality of second taps 422 may not escape, but the second slag S2 may be dissolved in the liquid state. If so, it is easily exited from the plurality of first tapping holes 412 and the plurality of second tapping holes 422.

The plurality of first taps 412 may be round (FIG. 4 (a)), oval (FIG. 4 (b)) or triangular (FIG. 4 (c)) or square (FIG. 4) along the lateral circumference of the hopper 410. It may be formed through the hopper 410 in any one of a polygonal shape, such as (d)).

The plurality of first tapping holes 412 may be irregularly formed, and may be formed to be aligned in a predetermined line (N1, N2, N3) parallel to the ground as in this embodiment. At this time, the first tapping holes 412 formed between the upper and lower adjacent lines N1, N2, and N3 are arranged in a zigzag form without being vertically disposed (see FIG. 4 (e)). Therefore, it is possible to prevent the interference phenomenon in which the molten second slag S2 blocks the first tap hole formed in the lower line while the molten second slag S2 exits the first tap hole 412.

On the other hand, the diameter (r3) of the plurality of first tap 412 has a different size for each line (N1, N2, N3) according to the size of the second slag (S2) and the dissolution rate of the second slag (S2). In this embodiment, the diameter (r3) was formed so as to sequentially increase from the upper line to the lower line. Through this, the second slag S2 in the liquid phase can be more easily dropped into the crucible 200 at the lower side with a large amount of tapping.

Hereinafter, a slag dissolving method for dissolving slag and removing impurities by using the slag melting furnace described above will be described in more detail.

5 is a view showing a progress state of the slag dissolution method according to an embodiment of the present invention, Figure 6 is a flow chart showing a slag dissolution method according to the present invention.

5 and 6, the slag melting method according to an embodiment of the present invention, first, the first slag (S1) of the solid state in the crucible 200 provided in the inner space (F) of the slag melting furnace 100 Charged (S100). At this time, the amount of the first slag (S1) to be charged into the crucible 200 is not charged with the entire amount of the slag (S) to be dissolved, as in the prior art, but a portion of the slag (S) to be dissolved is charged.

Thereafter, the hopper 400 is installed on the melting furnace cover 130 so as to be positioned above the crucible 200, and the second slag S2 in the solid state is charged into the hopper 400 (S200). Here, the second slag S2 means that the first slag S1 is excluded from the slag S to be dissolved. Meanwhile, in the process of charging the second slag S2 into the hopper 400, the size of the second slag S2 is larger than the diameters of the plurality of first tapping holes 412 and the plurality of second tapping holes 422. In a small case, a part of the second slag S2 may fall into the crucible 200.

When charging of the slag (S; S1, S2) is completed in the crucible 200 and the hopper 400 as described above (see Fig. 5 (b)), by driving the heating unit 300, the crucible 200 and the hopper Heating of the 400 is made (S300). At this time, the lower portion of the crucible 200 and the hopper 400 is heated in a thermal circulation method by the hot air (A) circulated in the slag melting furnace 100 (see Fig. 5 (c)).

When the heating is continued for a predetermined time, the first slag S1 charged in the crucible 200 and the second slag S2 charged in the hopper unit 400 start to dissolve. In particular, the dissolved second slag (S2) is lowered to the lower portion of the hopper unit 400 by its own weight to the plurality of first tapping holes 412 and the plurality of second tapping holes 422 formed in the hopper part 400. Out through the hopper 400 through the fall inside the crucible 200 (S400). The dropped second slag S2 is naturally mixed with the first slag S1 in the crucible 200 (see FIG. 5 (d)).

As such, when the second slag S2 starts to fall from the hopper 400 to the crucible 200, the amount of the second slag S2 injected into the hopper 400 decreases, but falls into the crucible 200. The second slag S2 in the solid state may be replenished to the upper side of the hopper unit 400 by the amount of the second slag S2 to be replenished.

When heating proceeds further, when all of the second slag S2 introduced into the hopper 400 falls into the crucible 200 (see FIG. 5E), the hopper 400 is separated from the slag melting furnace 100 and slag. Transfer to one side outside the melting furnace 100 (S500).

Subsequently, a lance (500), which is an oxygen injection tube, is poured into the slag S dissolved in the crucible 200 to form a liquid state, and oxygen (O ₂ ) gas is injected into the slag (S) and sulfur (sulfur) from the slag (S). The same impurities are removed (S600, see Fig. 5 (f)).

When the impurity removal process is completed, after separating the lance 500 from the slag melting furnace 100, and tapping the slag (S) of good quality from the crucible 200 (S700).

As described above, through the slag melting furnace and the slag melting method using the same according to the present invention, it is possible to quickly promote the dissolution of the slag to reduce the energy used during melting, and to prevent the aging of the used equipment.

In addition, the high-quality slag can be stably supplied in a timely manner, thereby increasing the productivity of the slag and contributing to cost reduction and quality improvement through recycling of the slag.

As mentioned above, although this invention was demonstrated with reference to the above-mentioned Example and an accompanying drawing, this invention is not limited to this, It is limited by the following claims. Therefore, it will be apparent to those skilled in the art that the present invention may be variously modified and modified without departing from the technical spirit of the following claims.

1 is a view schematically showing a conventional slag melting furnace and a melting method.

2 is a view showing the internal configuration of the slag melting furnace according to an embodiment of the present invention.

3 is a view showing a hopper according to the present invention.

4 is a view showing a modification of the hopper portion shown in FIG.

5 is a view showing a progress state of the slag dissolution method according to an embodiment of the present invention.

6 is a flow chart showing a slag dissolution method according to the present invention.

<Description of Signs of Major Parts of Drawings>

100: slag melting furnace 200: crucible

110: melting furnace body 130: melting furnace cover

132: exhaust passage 300: heating unit

310: combustion means 320: air supply means

400: hopper portion 410: hopper

412: first tap 420: table

422: second hot water outlet 430: stopper

500: Lance

A: air F: internal space

S, S1, S2: slag

Claims (11)

A melting furnace body providing an inner space and having an open top; A melting furnace cover coupled to an open upper end of the melting furnace body and having an exhaust passage formed at a central portion thereof; A heating unit for heating the internal space; A crucible provided in the inner space and having one side opened and a first slag charged therein; And A hopper unit spaced apart from the open side of the crucible, the second slag is charged and the second slag falls into the crucible; Slag melting furnace comprising a. The method of claim 1, The heating unit is a combustion means for heating the internal space through one side of the furnace body; Slag melting furnace comprising; air supply means coupled to the combustion means for supplying and circulating air to the internal space. The method of claim 1, The hopper portion, A hopper partially inserted into the exhaust passage, the hopper penetrating up and down and having a plurality of first tap holes formed along a side circumference; At least one surface plate inserted into a through area of the hopper to prevent a fall during charging of the second slag; And A plurality of stoppers coupled to protrude from the side of the hopper to support the hopper apart from each other on the exhaust passage; Slag melting furnace comprising a. The method of claim 3, wherein The lower portion of the hopper has an inner diameter of the exhaust passage and an outer diameter smaller than the inner diameter of the crucible, the plurality of first hot water outlet is formed along the lower side of the hopper exposed to the inner space. The method of claim 3, wherein The at least one surface plate is made of a plate-shaped body in contact with the inner circumferential surface of the hopper, the plate-shaped body is a slag melting furnace is formed a plurality of second tap. The method of claim 5, When the at least one platen is inserted into the hopper a plurality of up and down in the hopper slag melting furnace is formed in the smaller diameter of the plurality of second tapping the lower the plate located in the hopper. The method of claim 6, Slag melting furnace of the plurality of first tap or the plurality of second tap is formed in any one shape selected from the group consisting of circular, elliptical or polygonal. In the dissolution method of dissolving slag, Inserting the first slag into the crucible provided in the slag melting furnace; Installing a hopper above the crucible and charging a second slag into the hopper; Heating the crucible and the hopper portion; Mixing the melted second slag with the melted first slag into the crucible; And Tapping the mixed slag from the crucible; Slag melting method comprising a. The method of claim 7, wherein In the step of heating the crucible and the hopper portion, A slag dissolving method using a thermal circulation method of heating and circulating air to heat the crucible and the hopper portion. The method of claim 8, In the step of the molten second slag falls into the crucible, And replenishing the second slag above the hopper by an amount of the second slag falling into the crucible. The method of claim 8, And after the mixing of the first slag and the second slag, separating the hopper from the slag melting furnace, and spraying oxygen into the crucible to remove impurities.

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