JP2015040638A - Apparatus and method for manufacturing solidified slag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus and method for manufacturing solidified slag in which the solidified slag is compact with less pores, and the desired solidified slag of around 20 mm can be easily obtained by subsequent crushing, and also the production efficiency is superior.SOLUTION: An apparatus 1 for manufacturing solidified slag concerning the present invention is characterized as follows: molds 4 are formed of recesses 4a where molten slag 3 is poured into both sides; a circumferential movement mechanism 7 is provided for horizontally revolving and moving a plurality of molds 4 while being brought closely and supported; the circumferential movement mechanism 7 includes an air-cooled moving part 9 for moving the molds 4 in the revolving direction, and air-cooling and solidifying the molten slag 3 in the state where the poured molten slag 3 is held in the recesses 4a while the molds 4 are revolved one round, an inversion ejecting part 11 for reversing the molds 4 and ejecting the solidified slag 18, and a moving part 12 for moving the reversed molds 4 as being reversed; and each mold 4 is reversed every round and the molten slag 3 is poured into the recesses 4a of different faces.

Description

  The present invention is an apparatus that solidifies molten slag (hereinafter referred to as molten slag) in a metal mold and discharges the solidified slag (hereinafter referred to as solidified slag) from the mold every round of the apparatus. The present invention relates to a solidified slag manufacturing apparatus that continuously performs the operation for each round, and a solidified slag manufacturing method using the solidified slag manufacturing apparatus.

In order to solidify the molten slag generated in the metal refining process, high-pressure cooling water is sprayed onto the molten slag and cooled rapidly, or the molten slag is left in a dry pit or slag yard and gradually cooled in the atmosphere. The method is widely used.
When the molten slag is rapidly cooled, a large amount of high-pressure cooling water is blown, so that it becomes a sand-like solidified slag (so-called granulated slag) having a number of pores and a particle diameter of 5 mm or less. On the other hand, when the molten slag is gradually cooled by flowing between the soils, the thickness becomes several meters, and this is crushed into a solidified solid slag (so-called gradually cooled slag).

  In recent years, with the reuse of solidified slag, solidified slag has been applied to coarse aggregate for concrete instead of gravel. In order to apply the solidified slag to the coarse aggregate for concrete, it is necessary to reduce pores in the slag and adjust the maximum value of the slag particle size to about 20 mm. Therefore, granulated slag cannot be applied to coarse aggregate for concrete because it has many pores and small particle size as it is, while slow-cooled slag has a mass of several meters of 20 mm. It takes a long time to crush to a particle size of a certain level and is not efficient.

  Therefore, various techniques for solidifying molten slag using a relatively small mold have been proposed in order to obtain solidified slag with few pores and easy crushing as coarse aggregate for concrete. If the slag is solidified in a small mold, a size larger than the granulated slag and smaller than the slow-cooled slag can be easily obtained, and the crushing time can be shortened from the slow-cooled slag. The solidified slag can be easily obtained.

As an apparatus for producing solidified slag using such a small mold, there is a continuous solidification apparatus for slag disclosed in Patent Document 1, for example.
The continuous solidification device for slag disclosed in Patent Document 1 connects a plurality of metal molds in an endless manner and moves them in one linear direction while pouring molten slag into the mold to solidify the solidified slag. It is to discharge continuously from the mold.
Another example of manufacturing solidified slag using a small mold is an iron metallurgical iron processing apparatus described in Patent Document 2, for example. The iron metallurgical iron processing apparatus of Patent Document 2 uses a rotary table, and the casting vessel is continuously horizontal on a curved track while always maintaining the casting surface in each casting vessel in a horizontal position. It moves and goes around a plurality of times to solidify the slag thinly per turn, and thickens the slag by a plurality of turns (see the upper right column on page 2 of Patent Document 2).

JP 2003-207281 A JP-A-53-32828

The continuous solidification device for slag described in Patent Document 1 connects a plurality of molds endlessly, and after pouring molten slag into a mold on one end side of endless shape, linearly moves to the other end of endless shape. The mold is inverted at the other end, the solidified slag is discharged from the mold, and the mold in the inverted state is linearly moved to the one end side and returned.
In an apparatus for connecting a plurality of molds linearly and endlessly as described above, since the going process and the returning process have the same length, the molten slag is poured into the mold and moved (going process) The time required for discharging the solidified slag and moving the mold in the empty state (return process) is the same. The time for pouring and moving the molten slag into the mold is the time required to solidify the molten slag, and the number of connected molds and the moving speed are determined based on this time. For this reason, the moving time after inverting the mold is wasted. Also, when trying to increase the moving speed, it is necessary to increase the number of connected molds in order to secure the solidification time, and it is necessary to suspend the molds at a long distance, the structure of the apparatus is complicated, and the equipment cost becomes large. In addition, there is a problem that the operation cost such as driving electric power becomes large.

  Moreover, in the continuous slag solidification apparatus described in Patent Document 1, the molten slag is poured into one side of the mold, the mold is inverted, the solidified slag is discharged from the mold, and then only the one side on which the molten slag is poured. This is a method of cooling by injecting cooling water into the mold, so the temperature difference between both sides of the mold tends to be large, especially when the mold has a large heat load as in the case of increased productivity. There was a problem that the mold was easily deformed to warp.

  The iron metallurgical iron processing apparatus described in Patent Document 2 always moves the casting container (mold) in a horizontal state, and thins the thickness of the casting layer at the time of one turn in order to solidify the hot metal early. And it is an apparatus which obtains a casting layer of desired thickness by circulating a casting container in multiple times and laminating a casting layer in multiple layers. Therefore, except for discharging the lump with the desired thickness, it is necessary to move horizontally between multiple rounds with the concave portion of the casting container always facing upward, and casting with molten iron poured Air or steam is blown over the hot metal to quickly solidify the layer. Moreover, there is no description about cooling of a casting container, and after discharging lump from a casting container, it seems that the casting container casts molten iron in the state as it is.

  Therefore, when the method and apparatus of Patent Document 2 are adopted, a plurality of rounds are required, and during that time, the casting container is not forcibly cooled at all. Therefore, the casting container is distorted by the heat of the hot metal and the apparatus continuously rotates. There are many problems that make it impossible. In addition, there is a problem that it takes time for a plurality of rounds and it is difficult to obtain a coagulated mass efficiently. Further, since the lump solidified from FIG. 1 of Patent Document 2 is tilted in the radial direction of the circulation direction and discharged from the casting container, the center of gravity is shifted from the rotation center, and the balance of the entire rotating device is easily lost and stable. Thus, it was difficult to obtain a coagulated lump.

  The present invention has been made in order to solve the above-described problems. In continuous solidification of molten slag, the present invention is a dense solidified slag with few pores, which can be easily crushed by the subsequent crushing to a desired slag of about 20 mm. It is an object of the present invention to provide a solidified slag production apparatus and a solidified slag production apparatus using the solidified slag production apparatus, which are easy to obtain solidified slag from which products can be obtained, have high mold durability, and have high production efficiency. To do.

(1) A solidified slag production apparatus according to the present invention is a solidified slag production apparatus for continuously producing solidified slag by pouring molten slag into a plurality of metal molds that circulate.
The mold has recesses into which molten slag is poured on both sides, and includes a circumferential movement mechanism that moves in a horizontal direction in a state where the plurality of molds are supported close to each other. While circulating, the molten slag that has been poured is held in the concave portion, the mold is moved in the circumferential direction, the molten slag is cooled by air, and the molten slag is cooled and solidified, and the mold is inverted and the solidified slag is discharged. And a reversing discharge part to be moved and a moving part for moving the reversed mold in an inverted state, wherein each mold is reversed at each turn so that molten slag is poured into the recesses on different surfaces. Is.

(2) Further, in one round of the orbital movement mechanism described in (1) above, the length (angle) occupied by the air-cooling movement unit exceeds 1/2 (180 degrees) of the entire orbit (360 degrees), 3 / It is characterized by being less than 4 (270 degrees).

(3) Further, in the above (1) or (2), the reversing discharge unit is characterized in that the mold is reversed by rotating the mold in the circumferential direction.

(4) Further, in any one of the above (1) to (3), the moving unit is provided with a cooling device for injecting and cooling a coolant on both upper and lower surfaces of the mold. It is.

(5) Further, in the above (4), the mold is cooled so that the surface temperature of the mold is 300 ° C. or less.

(6) The method for producing solidified slag according to the present invention is a method for producing solidified slag by using the solidified slag producing apparatus according to any one of (1) to (5) above,
A molten slag injection step for injecting molten slag into the concave portion of the mold, an air cooling step for air-cooling the molten slag while rotating the mold infused with the molten slag, and a plate having a thickness of 20 to 40 mm by inverting the mold And a solidified slag discharge step for discharging the molten slag solidified.

In the present invention, it comprises a circular movement mechanism that moves in a horizontal direction in a state where a plurality of molds having concave portions into which molten slag is poured on both sides are supported close to each other. An air-cooling moving part for solidifying by air cooling, a reversing discharge part for discharging the solidified slag by reversing the mold, and a moving part for moving the reversed mold in an inverted state, each mold being rotated By inverting and allowing molten slag to flow into the recesses on different surfaces, the length of the air-cooling movement process is not limited as in the conventional example in which the molds are linearly connected endlessly, and the air-cooling movement part It can be assigned to the length of the air-cooled moving part, except for the length in the circulation direction required for each part such as the subsequent reverse discharge part, so there is no wasted time in the circulation process, and as a result, the solidification slag is made efficient Target It can be produced.
In addition, since the surface of the mold into which the molten slag is poured changes every turn, the thermal stress acting on the mold can be relieved, and the mold can be prevented from being deformed. In addition, after the mold was reversed and the molten slag was discharged, the next side was allowed to receive the next molten slag while the surface on which the molten slag was poured was reversed. Therefore, the mold can be cooled for a longer time than when molten slag is received.

It is a schematic diagram which shows typically the whole structure of the solidification slag manufacturing apparatus which concerns on one embodiment of this invention. It is explanatory drawing of the casting_mold | template of the solidification slag manufacturing apparatus which concerns on one embodiment of this invention. It is explanatory drawing explaining arrangement | positioning of each part of the rotation moving mechanism in the solidification slag manufacturing apparatus which concerns on one embodiment of this invention. It is a schematic diagram which shows typically the whole structure of the solidification slag manufacturing apparatus of a comparative example. It is explanatory drawing of the casting_mold | template of the solidification slag manufacturing apparatus of a comparative example. It is explanatory drawing explaining arrangement | positioning of each part of the rotation moving mechanism in the solidification slag manufacturing apparatus of a comparative example.

A solidified slag production apparatus 1 (FIG. 1) according to an embodiment of the present invention is a solidified slag production apparatus that continuously produces solidified slag 18 by pouring molten slag 3 into a plurality of metal molds 4 that circulate. The mold 4 is provided with a recessed portion 4a into which the molten slag 3 is poured on both sides, and is provided with a revolving mechanism 7 that revolves in the horizontal direction in a state where a plurality of molds 4 are brought close to each other and supported. The mechanism 7 is an air-cooled moving part 9 that moves the mold 4 in the rotating direction while holding the poured molten slag 3 in the recessed part 4a while the mold 4 makes one round, and air-cools and solidifies the molten slag 3; The reversal discharge part 11 which reverses the casting_mold | template 4 and discharges the solidification slag 18 and the moving part 12 which moves the reversed casting_mold | template 4 in the reversed state are provided, and each casting_mold | template 4 is reversed for every round and is different. In the recessed part 4a It is characterized in that the melting slag 3 is poured.
In addition, the solidification slag manufacturing apparatus 1 is good to install the trough 22 so that the molten slag 3 may be easily poured into the mold 4.
Hereinafter, each configuration will be described in detail.

<Mold>
The mold 4 has shallow concave portions 4a into which the molten slag 3 is poured on both surfaces. More specifically, as shown in FIG. 2, the mold 5 is preferably a metal container having a substantially trapezoidal recessed portion 4a. As shown in FIG. 1, the mold 4 of the present embodiment is arranged close to each other so that a plurality of molds 4 form a circumference. Therefore, in order to arrange them efficiently in a circumferential shape, the side portion on the outer peripheral side has a lower trapezoid and the side portion on the inner peripheral side has a substantially trapezoidal shape.
In this example, since the mold 4 is arranged in a circumferential shape, the shape of the mold 4 is substantially trapezoidal in plan view, but the shape can be efficiently arranged according to the shape of the orbit. You only have to set it. For example, if the circular orbit is rectangular, the mold 4 is preferably rectangular.

The inner wall of the mold 4 may have an inclined surface 4b that is inclined outward from the bottom toward the top. This is to make the solidified slag easy to release when the mold 4 is inverted.
Moreover, when casting the molten slag 3, the mold 4 may be provided with a slag fall prevention portion 4 c for preventing the molten slag 3 from falling into the gap between the adjacent molds 4 (see FIG. 2).
The material of the mold 4 is made of a metal having excellent heat resistance such as cast steel or stainless steel. The thickness of the mold 4 is preferably about 40 mm, for example. If the thickness of the mold 4 is too thin, it is likely to be deformed by the heat of the high-temperature slag, causing trouble in conveyance. Therefore, it is preferable that the thickness is at least 20 mm. Conversely, if the thickness is too thick, the weight increases. In this case, it is preferable that the thickness is 80 mm or less.

  In addition, when using solidification slag as concrete coarse aggregate so that it may mention later, 20-40 mm is preferable for the thickness of solidification slag. In order to produce a solidified slag having such a solidified thickness, the depth of the recessed portion 4a of the mold 4 is preferably about 60 to 200 mm, which is about 3 to 5 times the solidified thickness. If the solidified thickness was about 3 to 5 times, the molten slag did not overflow from the mold even when the flow rate of the molten slag varied.

<Circular movement mechanism>
The circular movement mechanism 7 supports the plurality of molds 4 in a circular shape in a proximity state and moves them around. The support mechanism for supporting the mold 4 is not particularly limited. For example, a shaft portion and a wheel are provided on the outer peripheral side and the inner peripheral side of the mold 4 and the wheel is supported on a rail extending in the circumferential direction. What is necessary is just to make it rotate at a predetermined speed with a drive mechanism.
As shown in FIGS. 1 and 3, the orbital movement mechanism 7 includes an air-cooling movement unit 9, a reverse discharge unit 11, and a movement unit 12 in order in the circulation direction, as shown in FIGS. 1 and 3.
Hereinafter, each part of the circular movement mechanism 7 will be described in detail.

<Air-cooled moving part>
The air-cooling moving part 9 is a part that moves the casting mold 4 in the circumferential direction in a state where the poured molten slag 3 is held in the recessed part 4a to air-cool and solidify the molten slag 3.
The air-cooling moving unit 9 requires time until the molten slag 3 poured into the air-cooled state is cooled to a predetermined solidified state, but the orbiting moving mechanism 7 of the present embodiment circulates the mold 4 in the horizontal direction. Since it is made to move, there is no restriction that the half of the circular movement becomes the air-cooling moving part 9 for melting slag solidification as in the case where the mold 4 is linearly connected endlessly.
For this reason, it is possible to assign the air cooling moving unit 9 with a length excluding the circumferential length required for each part such as the reverse discharge unit 11 following the air cooling moving unit 9. As a result, useless time can be prevented from occurring during the round trip.
In the air-cooling moving unit 9, water spraying is prohibited because the strength of the slag solidified and solidified into a porous body is reduced when water is sprayed on the slag and cooled.
Further, the length (angle) occupied by the air-cooling moving unit 9 is preferably set to be more than 1/2 (180 degrees) and less than 3/4 (270 degrees) of the ratio of the total length of the orbit (360 degrees).

《Reverse discharge unit》
The reverse discharge part 11 is a part for discharging the solidified slag 18 by inverting the mold 4 so that the recessed part 4a faces downward.
As shown in FIG. 1, the reverse discharge unit 11 is disposed next to the air-cooling moving unit 9 and is provided below the mold 4 around which the pits 19 that can store the solidified slag 18 to be discharged circulate. ing. You may make it arrange | position the container for accommodating slag in a pit, and to accommodate and convey slag.
Although the mechanism for reversing the mold 4 is not particularly limited, for example, as described in the explanation of the circular movement mechanism 7 above, the mold 4 is rotatably supported when the shaft 4 is supported on the rail via the wheel. In addition, the air-cooling moving unit 9 is provided with a holding unit that holds the posture of the mold 4 so that the mold 5 does not rotate. Subsequently, when the mold 4 comes to the reverse discharge unit 11, the posture of the mold 4 is set. What is necessary is just to provide the guide part which guides so that it may reverse.

  As shown in FIG. 1, the reversal direction of the mold 4 is preferably reversed by rotating it in the circumferential direction. If the mold 4 is rotated in the rotating direction to be reversed, the center of gravity is shifted from the rotating center as in the case where the mold 4 of Patent Document 2 is tilted in the radial direction of the rotating direction, for example, and the balance of the entire rotating device. There is no problem of collapse. The rotation of the mold 4 in the circumferential direction may be either forward rotation or reverse rotation.

《Moving part》
The moving part 12 is a part that moves the mold 4 that has been inverted and discharged the solidified slag to a part where the molten slag 3 is poured again while the mold 4 is inverted by the inverted discharging part 11. As shown in FIG. 1, the moving unit 12 is preferably provided with a cooling device 20 that cools the mold 4 by injecting a coolant from the upper side and the lower side of the mold 4.
Specifically, it is preferable to spray the cooling water, mist, or cooling gas from the upper side and the lower side to the mold 4 in which the cooling water, the cooling gas, and the like are reversed. It is better to cool it by spraying it.

In the present embodiment, the cooling water naturally falls on the lower surface side of the mold 4, but the cooling water accumulates in the mold on the upper surface side, so that it can be efficiently cooled with a small amount of cooling water. However, if the molten slag is poured again into the mold 4 while the cooling water remains in the mold 4, there is a problem that many pores are generated in the solidified slag and cannot be applied as a concrete coarse aggregate, and there is a risk of causing a steam explosion. Therefore, it is necessary to pay attention to the control of the cooling water on the upper surface side.
The amount of cooling water jetted is controlled according to the mold temperature so as not to generate excessive accumulated water, and the mold temperature is prevented from being excessively lowered below 150 ° C., and the drying time, that is, the final cooling water on the upper surface side is determined. This problem can be solved by securing a certain amount of travel time from the injection position to the slag injection position.

Even when the amount of cooling water is reduced, it is desirable to use a two-mist mist spray nozzle as the upper cooling water nozzle from the viewpoint of ensuring a predetermined cooling area and cooling efficiency.
Further, it is desirable to drain water by installing a wiping nozzle for draining water after the final injection position of the cooling water on the upper surface side and blowing air, and it is also possible to perform draining and drying by blowing a gas jet for air cooling. good.

  On the other hand, the surface that has been in contact with the solidified slag 18 becomes the lower surface side in the moving unit 12, and most of the sprayed cooling water is spontaneously dropped and collected and reused. 4 can be set freely in consideration of the cooling condition. In addition, there is no problem even if cooling water adheres to the lower surface when molten slag is poured. As shown in FIG. 1, a sufficient cooling section (a cooling section longer than the upper surface) is secured as required. You can do that. If there is a puddle below the mold 4 at the position where the molten slag is poured, a steam explosion may occur if the molten slag overflows. Therefore, the molten slag adheres to the mold 4 at the position where the slag is poured. It is necessary to drain or dry to such an extent that the water that has been dropped does not fall. For this reason, a wiping nozzle for draining may be provided as necessary on the upper surface side.

  In order to cool the mold without excess or deficiency while preventing the cooling water from remaining on the upper surface side where the molten slag is poured in response to the transient change in the mold temperature, each of the upper surface side and the lower surface side of the cooling device 20 is used. It is desirable to divide this piping system into a plurality of circumferential directions and control the cooling water flow rate for each piping system.

  In addition, by cooling the mold 4 from both the upper and lower sides, the cooling time can be shortened as compared with cooling from only one side, and therefore the length of the reversal moving portion 13 for mold cooling with respect to the entire round length is shortened. Accordingly, the length of the air-cooling moving part 9 for slag solidification can be increased by that amount, and the length of the air-cooling moving part 9 can be more than ½ of the entire length of the orbit.

  In addition, in the case of a device having a recessed portion only on one side of the mold, it is necessary to provide a portion for re-inversion of the mold in the circular track to flow the slag again. In this embodiment, it is not necessary to reinvert the template. Therefore, there is also an advantage that such a portion for re-inversion can be used as a mold cooling or air cooling moving part.

As described above, the length of the air-cooling moving part 9 needs to be a predetermined length because it is necessary to secure time for the molten slag 3 to solidify into a predetermined state. The fact that the ratio of the length of each part in can be reduced means that the entire apparatus can be miniaturized. In that sense, cooling the mold 4 from the upper and lower surfaces greatly contributes to the miniaturization of the entire apparatus.
Moreover, since the mold 4 can be cooled evenly by cooling the mold 4 from the upper and lower surfaces, it is possible to prevent the mold 4 from being deformed by thermal stress. Furthermore, since the concave portions are provided on both sides of the mold 4 so as to flow the slag, the thermal stress is applied symmetrically, so that it is possible to prevent warpage deformation of the mold 4 even when the heat load is large. There is also an effect. The deformation of the mold 4 is an important problem for carrying out these operations stably for circular movement and reversal, and is also important for improving productivity while making the slag thickness uniform and completing solidification in the air-cooling moving part 9. Therefore, prevention of deformation of the mold 4 is the key to the operation of this apparatus.

  As described above, the cooling of the mold 4 is preferably performed from both the upper side and the lower side, but in the present invention, one-side cooling from only the upper side or only from the lower side is not excluded.

  Moreover, as shown in FIG. 1, after cooling with the cooling device 20, it is preferable to move only a predetermined distance, and after that, pouring molten slag again. The reason for this is that the moisture remaining on the upper surface of the mold 4 during the cooling during the movement is evaporated by the residual heat of the mold 4 and is completely removed by moving it by a predetermined distance after the cooling.

An example of a method for producing solidified slag using the solidified slag producing apparatus 1 of the present embodiment configured as described above will be described together with the operation of the solidified slag producing apparatus 1.
The orbiting movement mechanism 7 is rotated at a predetermined speed, and the molten slag 3 is poured into the circulating mold 4 at the molten slag inflow portion during one round of the apparatus, and the mold 4 into which the molten slag 3 is poured is moved by air cooling. The molten slag 3 moves through the portion 9 and is deprived of heat by the mold 4 and is air-cooled to become solidified slag.
The mold 4 arriving at the reverse discharge unit 11 rotates and reverses in the circumferential direction at the reverse discharge unit 11, and the solidified slag 18 is discharged into the pits 19. The mold 4 from which the solidified slag 18 has been discharged moves the moving part 12 in an inverted state, and is cooled by the cooling device 20 during the movement.
The molten slag 3 is poured into the casting mold 4 that has passed through the moving portion 12 again at the slag inflow portion.

As described above, in the present embodiment, the circular movement mechanism 7 that moves in the horizontal direction in a state in which the plurality of molds 4 are supported in the proximity state is provided, and air cooling is performed during one turn of the circular movement mechanism 7. The air cooling moving part 9 for solidifying, the reversing discharge part 11 for reversing the mold 4 so that the recessed part 4a faces downward and discharging the solidified slag 18 and the reversing mold 4 are moved in the inverted state. Since the moving part 12 is provided, the entire peripheral length of the apparatus is not limited by the required length of the air cooling process of slag solidification as in the conventional example in which the molds are linearly connected endlessly, and the air cooling moving part 9 can be assigned to the length of the air-cooling moving unit 9 except for the length in the circulation direction required for each part such as the reverse discharge unit 11 following 9, and no wasteful time is generated in the circulation process.
Moreover, in this Embodiment, since the casting_mold | template 4 is cooled from both upper and lower surfaces in the moving part 12, the casting_mold | template 4 can be cooled efficiently and the length of the moving part 12 can be shortened by this. Further, in the present embodiment having concave portions on both sides of the mold, it is not necessary to re-invert the mold in order to flow the molten slag again, so that the portion for this can be used for the cooling of the mold and the air-cooling moving section. There are also advantages. As a result, the circulation length can be shortened and the entire apparatus can be made compact.

In addition, in order to manufacture the thing of the particle size range of the blast furnace slag coarse aggregate 2005 prescribed | regulated to slag aggregate for JIS A5011 concrete-1st part: blast furnace slag aggregate, the solidification thickness of slag was 20-40 mm. Therefore, when the solidification thickness is 20 mm or less, the particle size distribution after crushing becomes fine and does not satisfy the standard.
On the other hand, when the solidification thickness is 40 mm or more, the water absorption rate increases and exceeds 1.5%, and crushing is required to reduce it to 20 mm or less, and the fine grains of less than 5 mm increase and the yield decreases. become.

The effect by the solidification slag manufacturing apparatus 1 of this invention is demonstrated based on a specific Example.
In this embodiment, the mold 4 is made of cast steel having a trapezoidal shape in plan view, the thickness is 45 mm, the upper base short side of the trapezoid outer diameter is 0.7 m, and the length of the lower base short side of the trapezoid outer diameter is 1. 0.0 m, and the height of the trapezoid outer diameter was 2.7 m. Moreover, the depth of the recessed part 4a of both surfaces of the casting_mold | template 4 was 100 mm.
The circular movement mechanism 7 is the same as that shown in FIG. 1, and the conveyance speed for circular conveyance is 120 degrees / min in angular velocity.
At the slag inflow site, molten blast furnace slag of 1360 ° C. or higher and 1410 ° C. or lower was flowed into the mold 4 at about 2.1 t / min. The inflow speed of the molten slag was equal to the slag discharge speed calculated from the shape of the slag pan and the change speed of the tilt angle, and was adjusted by automatically controlling the tilt angle.
The mold 4 into which the molten slag 3 has been poured conveys the air-cooled moving part 9 for 126 seconds {the length of the air-cooled moving part is 70% of the entire circumference (252 degrees)}, and the molten slag 3 is solidified by heat removal by the mold and air cooling. It was slag.

As described in the embodiment, in the reverse discharge unit 11, the mold 4 is rotated in the circumferential direction with the support shaft as a rotation axis and reversed, and the solidified slag 18 is dropped into the pit 19 and discharged.
The mold 4 that has been reversed by the reversal discharge unit 11 and discharged the solidified slag 18 is moved in the inverted state, and the moving unit 12 is moved, and cooling water is sprayed from both the upper and lower sides at the site where the cooling device 20 is installed. And quickly cooled.
The mold 4 in the inverted state immediately after discharge of the solidified slag rose to a high temperature state exceeding 300 ° C. while the surface that was in contact with the solidified slag 18 was raised. It was possible to rapidly cool to a temperature of 200 ° C. or lower.

On the other hand, the back surface side of the mold 4 (the side opposite to the surface into which the molten slag was poured in the circumference) is the upper surface side in the moving part 12, and the cooling water is increased after the surface temperature immediately after discharging the solidified slag rises to 200 ° C or higher. The amount of cooling water on the upper surface side and the lower surface side and the range for injecting the cooling water were adjusted according to the surface temperature immediately after discharging the solidified slag so that the mold temperature before flowing the slag again did not become less than 150 ° C. Further, air was blown by a wiping nozzle (not shown) installed after the installation section of the cooling water spray nozzle on the upper surface side, and the accumulated water on the upper surface side of the mold 4 was discharged.
The mold 4 after cooling was again conveyed through the moving part 12 to the pouring position of the molten slag. During this time, the water remaining during the water cooling was evaporated by the residual heat of the mold 4 and completely removed.

  The temperature of the mold becomes the highest temperature just before the slag is inverted and dropped. However, if the surface temperature on the mold back side measured by the radiation thermometer exceeds 300 ° C., the proof stress decreases and the mold Since 4 may be deformed, it is desirable that the surface temperature on the back side of the mold 4 is 300 ° C. or lower by adjusting the watering amount and watering time.

  Thereafter, the molten slag was poured again into the mold that had been circulated back to the slag pouring position. The above process was repeated about 5 laps for one slag pan, and 30 tons of molten slag was continuously processed.

The slag dropped from the inverted mold was collected from the pit 19 and then measured for solidification thickness, which was 21 to 32 mm, and the average thickness was 26.2 mm.
Compared to the case where the molten slag 3 is flowed between soils, which has been conventionally performed, and has a thickness of several meters, the cooling rate is increased even with air cooling, and the solidified slag 18 has a dense crystalline with few pores. .

  As described above, according to the solidified slag manufacturing apparatus 1, a dense and high-quality solidified slag 18 having a very low pore content can be obtained efficiently and continuously.

  Next, in the solidified slag manufacturing apparatus 2 shown in FIG. 4 having a revolving mechanism similar to the embodiment, molten blast furnace slag is poured into the mold 5 having the recessed portion 5a only on one side shown in FIG. A comparative example for producing the solidified slag will be described. 4, parts having the same functions as those in FIG. 1 are denoted by the same reference numerals.

The molten slag 3 poured into the mold 5 is solidified by reversing the mold 5 by the reversing discharge section 11 after solidifying by heat removal and air cooling by the mold 5 while the mold 5 is transported through the air cooling moving section 9. The slag 18 dropped into the pit 19 and was discharged.
The mold 5 from which the solidified slag 18 had been discharged was conveyed through the reversal moving unit 13 while being in a reversed state, and was rapidly cooled by jetting cooling water from both the upper and lower surfaces at the site where the cooling device 21 was installed.
Subsequently, the mold 5 in the inverted state was re-inverted in the re-inversion part 15 and the original concave part 5a was again returned to the upward state, and then molten slag was poured again. The above process was repeated to continuously process the molten slag.

  While most of the cooling water sprayed from the lower side naturally falls while the concave portion 5a of the mold 5 is directed downward, if the adhering water remains in the concave portion 5a, the molten slag is poured again. It becomes a problem. For this reason, the mold temperature before pouring the slag again is 150 ° C. or higher so that the mold 5 evaporates due to the residual heat of the mold 5 while it is conveyed to the position where the molten slag is poured again through the re-inversion unit 15. The amount of cooling water and the range for injecting cooling water were adjusted according to the surface temperature immediately after discharging the solidified slag.

  In contrast to the above-described embodiment, in order to provide the re-inversion portion 15 with the same mold cooling and drying conditions as the embodiment, the air-cooling moving portion 9 is shortened by about 10% as shown in FIG. Therefore, it was necessary to set 64% (230 degrees) of the entire circumference, and the moving time of the air-cooling moving unit 9 was 115 seconds. From this, at the inflow speed of the molten slag equivalent to that of the embodiment, the inside of the slag discharged in the reverse discharge part 11 becomes unsolidified and flows out from the fracture surface, and a solid plate-shaped solidified slag cannot be obtained. In some cases, the molten slag inflow rate was adjusted to 2.0 t / min, and the average thickness of the solidified slag was 25.0 mm. As described above, in the example, there was no problem even when the inflow rate of the molten slag was set to 2.1 t / min. Therefore, it can be seen that in the example, the productivity can be improved by about 5% compared to the comparative example.

  In addition, when the mold cooling conditions were comparable, i.e., the mold back surface temperature immediately after discharging the solidified slag was equivalent, the degree of warpage deformation of the mold over a long period of time after use for 3 months was compared. The average warpage deformation amount was reduced to about 1/3 of the comparative example. In the example, it is considered that by introducing molten slag to both surfaces of the mold, the asymmetry of the thermal stress is relaxed and the warpage deformation is suppressed.

In the embodiment described above, an example in which the circulation direction is clockwise as shown in FIG. 1 is shown. However, the circulation direction in the present invention is not limited to this, and the air cooling moving unit, the reverse discharge unit, the moving unit May be counterclockwise.
Also, the shape of the circle may not be a circle but may be, for example, an ellipse or a rectangle.

1 Solidification slag production equipment (example of the present invention)
2 Solidified slag production equipment (comparative example)
3 Molten slag 4 Mold (Example of the present invention)
4a Recessed part 4b Inclined surface 4c Slag fall prevention part 5 Mold (comparative example)
5a Concave part 5b Inclined surface 5c Slag fall prevention part 7 Circumferential movement mechanism 9 Air cooling movement part 11 Reverse discharge part 12 Movement part 13 Reverse movement part 15 Reinversion part 17 Reinversion movement part 18 Solidification slag 19 Pit 20 Cooling device 21 Cooling device 22 樋

Claims (6)

A solidified slag production apparatus for continuously producing solidified slag by pouring molten slag into a plurality of metal molds that circulate,
The mold is formed with recesses into which molten slag is poured on both sides,
Comprising a circular movement mechanism for circular movement in the horizontal direction in a state of supporting the plurality of molds close to each other,
The orbiting movement mechanism includes an air-cooling moving unit that moves the mold in a circling direction while the molten slag poured in is held in the recessed portion while the mold makes one revolution, and air-cools and solidifies the molten slag, and the mold And a reversing discharge unit that discharges the solidified slag and a moving unit that moves the reversed mold in an inverted state.
Each casting mold is inverted for each turn, and molten slag is poured into the recessed portions of different surfaces.   In one round of the circular moving mechanism, the length (angle) occupied by the air-cooled moving part is more than 1/2 (180 degrees) and less than 3/4 (270 degrees) of the total length of the circular trajectory (full angle 360 degrees). The solidified slag manufacturing apparatus according to claim 1.   The solidification slag manufacturing apparatus according to claim 1, wherein the reverse discharge unit reverses the mold by rotating the mold in a circumferential direction.   The solidified slag manufacturing apparatus according to any one of claims 1 to 3, further comprising a cooling device that cools the moving portion by injecting a coolant onto both upper and lower surfaces of the mold.   The solidified slag manufacturing apparatus according to claim 4, wherein the mold is cooled so that the surface temperature of the mold is 300 ° C. or less. A solidified slag production method for producing a solidified slag using the solidified slag production apparatus according to any one of claims 1 to 5,
A molten slag injection step for injecting molten slag into the concave portion of the mold, an air cooling step for air-cooling the molten slag while rotating the mold infused with the molten slag, and a plate having a thickness of 20 to 40 mm by inverting the mold A solidified slag manufacturing method comprising a solidified slag discharging step of discharging solidified slag solidified.

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