JP2014080306A - Method and device for producing coarse aggregate for concrete - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for producing a coarse aggregate for concrete having excellent crushing efficiency and yield.SOLUTION: The method for producing a coarse aggregate for concrete uses a solidified slag production apparatus 51 in which a plurality of metallic molds 5 into which molten slag is made to flow are supported circumferentially movably, moten slag 3 is made to flow into the molds 5, and solidified slag 18 is continuously produced. The method comprises: a solidified slag production step S1 of producing the solidified slag 18 by the solidified slag production apparatus 51; a first crushing step S3 of dropping the produced solidified slag 18 from a prescribed height to crush the solidified slag; a first classification step S5 of classifying the solidified slag 18 crushed in the first crushing step S3; a second crushing step S7 of crushing the solidified slag 18 with a prescribed size or less classified in the first classification step S5 with an impact crusher; and a second classification step S9 of classifying the solidified slag 18 classified in the second crushing step S7 into 5 to 20 mm.

Description

  The present invention provides a solidified slag manufacturing 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 for each round of the apparatus. The present invention relates to a method and an apparatus for manufacturing coarse aggregate for concrete.

As a manufacturing method of the coarse aggregate for concrete using the solidification slag manufacturing apparatus, it is disclosed by patent document 1, for example.
In Patent Document 1, the solidified slag produced by the solidified slag production device is transported to another place by a shovel, crushed by a crushing device, sorted by a classifier, and again crushed to be classified into 5 to 20 mm. (See paragraphs 27 and 28 of Patent Document 1).

  Moreover, the solidification slag manufacturing apparatus disclosed in Patent Document 1 connects a plurality of molds in an endless manner, and after pouring molten slag into a mold on one end of the endless shape, linearly reaches the other end of the endless shape. It is moved, 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.

JP 2004-277191 A

  In the conventional method for producing coarse aggregate for concrete, after the solidified slag is produced by the solidified slag production device, the process from the solidified slag to the coarse aggregate for concrete is not rational. There was a problem that slag crushing efficiency and yield were poor.

Moreover, the solidification slag manufacturing apparatus used in Patent Document 1 connects a plurality of molds in an endless manner, and after flowing molten slag into a mold on one end side of an endless shape, linearly extends to the other end of the endless shape. There are also the following problems.
In an apparatus that connects a plurality of molds linearly and in an endless manner, the going process and the returning process have the same length, so the molten slag is poured into the mold and moved (the going process), and the solidification slag is reduced. The time required for discharging 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 reversing the mold is wasted, and the production efficiency of the solidified slag is deteriorated. As a result, the production efficiency of the concrete coarse aggregate is deteriorated.
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.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a method and apparatus for producing a coarse aggregate for concrete that is excellent in crushing efficiency and yield.

(1) In the method for producing a coarse aggregate for concrete according to the present invention, a plurality of metal molds having recessed portions into which molten slag is poured are supported so as to be able to move around, and molten slag is poured into the recessed portions and solidified. A method for producing coarse aggregate for concrete using a solidified slag production apparatus for continuously producing slag,
A solidified slag production process for producing solidified slag by the solidified slag production apparatus, a first crushing process for crushing the solidified slag by dropping the solidified slag produced by the solidified slag production apparatus from a predetermined height; A first classification step of classifying the solidified slag crushed in the crushing step; a second crushing step of crushing the solidified slag of a predetermined size or less classified by the first classification step with an impact crushing device; A second classification step of classifying the solidified slag crushed in the crushing step to 5 to 20 mm is provided.

(2) Further, in the above (1), the method further comprises a third crushing step of crushing the solidified slag exceeding the predetermined size classified in the first classification step with a compression crushing device, The process is characterized in that the solidified slag crushed in the third crushing step is classified in addition to the solidified slag crushed in the first crushing step.

(3) Moreover, in the above-mentioned (1) or (2), the first classification step is characterized by classification at 150 mm to 200 mm.

(4) Further, in any of the above (1) to (3), the thickness of the solidified slag produced by the solidified slag producing apparatus is 40 mm or less. Is.

(5) Moreover, in the thing in any one of said (1) thru | or (4), the said solidification slag manufacturing apparatus has the circumference movement mechanism which carries out circumference movement in the horizontal direction in the state which adjoined and supported these some casting_mold | templates. Prepared,
The circulatory moving mechanism moves the mold in the circulatory direction while holding the molten slag poured in the recess during one round of the apparatus, and air-cooled moving part for cooling and solidifying the molten slag by air, and the mold The reversing discharge part for discharging the solidified slag by reversing so that the recessed part is directed downward, the reversing moving part for moving the reversed mold in the reversed state, and the recessed part above the reversing mold. And a re-inversion unit for re-inversion so as to be suitable for the above.

(6) Further, in the above-described (5), the length (angle) occupied by the air-cooled moving portion in one round of the orbiting movement mechanism is ½ (180 degrees) of the entire orbit of the orbit (360 degrees). More than 3/4 (270 degrees).

(7) In the above (5) or (6), the reversing discharge unit is characterized in that the mold is reversed by rotating the mold in the circumferential direction.

(8) Further, in any of the above (5) to (7), a cooling device is provided for injecting and cooling the coolant on the upper and lower surfaces of the mold in the inverted state. It is.

(9) Further, in the above (8), the cooling device cools the mold so that the surface temperature of the mold back surface is 300 ° C. or lower.

(10) The apparatus for producing coarse aggregate for concrete according to the present invention supports a plurality of metal molds having recessed portions into which molten slag is poured so as to be able to move around. To produce a solidified slag, and a solidified slag production apparatus that continuously performs the operation for each round, and
A first crushing device for crushing the solidified slag by dropping the solidified slag produced by the solidified slag producing device from a predetermined height; a first classifying device for classifying the solidified slag crushed by the first crushing device; A second crushing device comprising an impact crushing device that crushes the solidified slag of a predetermined size or less classified by the first classifying device, and a second crushing device that classifies the solidified slag crushed by the second crushing device to 5 to 20 mm. A two-classifying device is provided.

(11) Further, in the above (10), a compression crushing device for crushing the solidified slag exceeding a predetermined size classified by the first classifying device is provided, and the first classifying device is a first crushing device. In addition to the solidified slag crushed by the apparatus, the solidified slag crushed by the compression crushing apparatus is classified.

(12) Further, in the above (10) or (11), the thickness of the solidified slag produced by the solidified slag producing apparatus is 40 mm or less. .

(13) Further, in any of the above (10) to (12), the solidified slag manufacturing apparatus includes a circling movement mechanism that circulates in the horizontal direction in a state where the plurality of molds are brought close to each other and supported. Prepared,
The circulatory moving mechanism moves the mold in the circulatory direction while holding the molten slag poured in the recess during one round of the apparatus, and air-cooled moving part for cooling and solidifying the molten slag by air, and the mold The reversing discharge part for discharging the solidified slag by reversing so that the recessed part is directed downward, the reversing moving part for moving the reversed mold in the reversed state, and the recessed part above the reversing mold. And a re-inversion unit for re-inversion so as to be suitable for the above.

(14) Further, in the above-described (13), the length (angle) occupied by the air-cooled moving part in one round of the orbiting movement mechanism is ½ (180 degrees) of the orbital full length (full angle 360 degrees). More than 3/4 (270 degrees).

(15) Further, in the above (13) or (14), the reversing discharge unit is characterized in that the mold is reversed by rotating the mold in the circumferential direction.

(16) Further, in any of the above (13) to (15), a cooling device is provided for injecting and cooling the coolant on both upper and lower surfaces of the mold in the inverted state. It is.

(17) Further, in the above (16), the cooling device cools the mold so that the surface temperature of the mold back surface is 300 ° C. or less.

  In the present invention, a solidified slag production process for producing solidified slag by the solidified slag production apparatus, and a first crushing process for crushing the solidified slag by dropping the solidified slag produced by the solidified slag production apparatus from a predetermined height. And a first classification step of classifying the solidified slag crushed in the first crushing step, and a second crushing step of crushing the solidified slag of a predetermined size or less classified by the first classification step with an impact crushing device. By providing the second classification step of classifying the solidified slag crushed in the second crushing step to 5 to 20 mm, the solidified slag produced by the solidified slag production apparatus can be efficiently crushed with high yield. As a result, the coarse aggregate for concrete can be produced efficiently and with a high yield.

It is a flowchart explaining the coarse aggregate manufacturing method for concrete which concerns on one embodiment of this invention. It is a graph explaining the particle size distribution in the manufacture process of the coarse aggregate manufacturing method for concrete which concerns on one embodiment of this invention. It is explanatory drawing explaining the whole structure of the coarse aggregate manufacturing apparatus for concrete which concerns on one embodiment of this invention. It is explanatory drawing of the solidification slag manufacturing apparatus which comprises the coarse aggregate manufacturing apparatus for concrete which concerns on one embodiment of this invention. It is explanatory drawing explaining a part of solidification slag manufacturing apparatus shown in FIG. 4 in detail. It is explanatory drawing explaining arrangement | positioning of each part of the rotation moving mechanism in the solidification slag manufacturing apparatus shown in FIG. It is explanatory drawing explaining the other aspect of the solidification slag manufacturing apparatus which comprises the coarse aggregate manufacturing apparatus for concrete which concerns on one embodiment of this invention. It is a top view explaining the 1st classifier which comprises the coarse aggregate manufacturing apparatus for concrete which concerns on one embodiment of this invention. It is a side view of the 1st classification apparatus shown in FIG.

As shown in FIG. 1, the method for producing a coarse aggregate for concrete according to the present embodiment includes a solidified slag production process S1 for producing solidified slag by a solidified slag production apparatus, and a solidified slag produced by the solidified slag production apparatus. Is classified by a first smashing step S3 in which the solidified slag is crushed by dropping from a predetermined height, a first classification step S5 in which the solidified slag crushed in the first smashing step S3 is classified, and a first classification step S5. Provided with a second crushing step S7 for crushing solidified slag of a predetermined size or less with an impact crushing device and a second classification step S9 for classifying the solidified slag crushed in the second crushing step S7 to 5 to 20 mm It is.
Further, in the present embodiment, a third crushing step S11 for crushing the solidified slag exceeding a predetermined size classified in the first classification step S5 with a compression crushing device is provided, and the first classification step S5 is the first classification step S5. The solidified slag crushed in the 3 crushing step S11 is also classified.
Hereinafter, each step will be described first, and then an apparatus used in each step will be described in detail.

<Coagulated slag manufacturing process>
Solidified slag manufacturing process S1 is a process of manufacturing flat solidified slag with a solidified slag manufacturing apparatus.
As the solidified slag manufacturing apparatus used in this process, a plurality of metal molds having recessed portions into which molten slag is poured are supported so as to be able to move around, and molten slag is poured into the recessed portions between one round of the apparatus. It is preferable to use a solidified slag that is produced by continuously rotating the operation for each round.
As shown in FIGS. 4 to 6, such a solidified slag manufacturing apparatus includes a horizontal revolving solidified slag having a horizontal revolving mechanism that revolves horizontally in a state where a plurality of molds are brought close to each other and supported. The manufacturing apparatus 1 may be used, or, as shown in FIG. 7, an endless solidified slag manufacturing apparatus 31 that linearly connects a plurality of molds endlessly.
However, as will be described later, it is more preferable to use the horizontal circulation type solidified slag manufacturing apparatus 1 provided with a horizontal circulation moving mechanism as shown in FIGS. 4 to 6 because there are various advantages.
In addition, as for the thickness of the solidification slag manufactured with a solidification slag manufacturing apparatus, 20-40 mm is preferable.
The reason for this is also described in the examples below, but when the thickness of the solidified slag is 20 mm or less, the particle size distribution after crushing becomes fine and may not satisfy the standard as a coarse aggregate for concrete. On the other hand, when the thickness of the solidified slag 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 fine grains of less than 5 mm increase and yield decreases. It is.
The details of the solidified slag manufacturing apparatus will be described later.

<First crushing step>
The first crushing step S3 is a step of crushing the solidified slag by dropping the solidified slag produced by the solidified slag producing apparatus from a predetermined height.
By using the fall due to gravity to roughly crush, the efficiency and yield of the subsequent second crushing step S7 are improved.
If the thickness of the solidified slag is 20 to 40 mm, the height of the drop may be 4.5 m or more, for example, so that the function as the first crushing step S3 can be achieved. It is preferable to place an iron plate on the floor where the solidified slag falls.

  Manufactured by a trapezoidal mold (see Fig. 5) with an upper base of 0.7m, a lower base of 2.7m, and a height of 2.7m, which is mounted on the horizontal circulating solidified slag manufacturing apparatus 1 shown in Fig. 4 described later. FIG. 2 shows the particle size distribution when the solidified slag having a thickness of 25 mm is dropped from 4.5 m. In FIG. 2, the vertical axis represents the passing percentage (%), and the horizontal axis represents the particle size distribution (mm). In FIG. 2, the particle size distribution after the third crushing step S11 for crushing the solidified slag of 150 mm or more classified by the first classification step S5 and the particle size distribution after the second crushing step S7 by the impact crusher are described together. doing.

As shown in FIG. 2, the particle size distribution after the first crushing step S3 is a particle size distribution in which about 150 mm or more is about 50%, and less than 150 mm is 50%. After the first crushing step S3, in the first classification step S5, classification is performed at 150 mm, and those less than 150 mm are directly crushed in the second crushing step S7.
In this way, by passing through the first crushing step S3, which is rough crushing by dropping, about 50% can be crushed by the impact crushing device in the second crushing step S7 without performing rough crushing by a machine. , Enabling efficient crushing.

<First classification process>
In the first classification step S5, the solidified slag crushed in the first crushing step S3 is classified. In the present embodiment, those having a size of 150 mm or more classified in the first classification step S5 are crushed by the third crushing step S11, and those crushed in the third crushing step S11 are also this first classification. Classification is performed in step S5.
1st classification process S5 is performed by a grizzly feeder (refer FIG. 8, FIG. 9), for example.
The purpose of performing the first classification step S5 is to improve the crushing efficiency and yield in the impact crushing device when crushing the second crushing step S7, which is the next step, with the impact crushing device. In that sense, in the first classification step S5, it is preferable to perform classification at 150 mm to 200 mm.

<Second crushing step>
The 2nd crushing process S7 is a process of crushing the solidification slag below the predetermined size classified by the 1st classification process S5 with an impact crushing device.
As the impact crusher used in the second crushing step S7, there is an impact crusher or a hammer crusher.
The reason for using the impact crushing device in the second crushing step S7 is that the corners of the solidified slag after crushing are taken and the shape becomes more preferable as the coarse aggregate for concrete.
As shown in FIG. 2, the particle size distribution of the solidified slag after the second crushing step S7 by the impact crusher is 50% when it is about 10 mm or more and 50% when it is less than about 10 mm.

<Third crushing step>
The third crushing step S11 is a step of crushing the solidified slag exceeding the predetermined size classified in the first classification step S5 with a compression crushing device.
As the compression crushing apparatus, a compression crushing apparatus such as a jar crusher is preferable.
As shown in FIG. 2, the particle size distribution of the solidified slag after being crushed by the third crushing device was 50% when it was 60 mm or more, 50% when it was less than 60 mm, and 0% when it was 150 mm or more. Therefore, through the third crushing step S11, all the solidified slag can be crushed in the second crushing step S7.
Note that the solidified slag crushed in the third crushing step S11 is classified again in the first classification step S5. But you may make it perform 2nd crushing process S7, without passing 1st classification process S5 after 3rd crushing process S11.

<Second classification process>
The second classification step S9 is a step of classifying the solidified slag crushed in the second crushing step S7 to 5 to 20 mm.
In the second classification step S9, the solidified slag crushed in the second crushing step S7 is sieved by the first vibrating screen, and the solidified slag of 20 mm or less under the sieve is sieved by the second vibrating screen to 5 to 20 mm on the sieve. To get solidified slag.
This 5-20 mm solidified slag is used as the coarse aggregate for concrete.

  As described above, according to the present embodiment, by providing the first crushing step S3 by dropping, rough crushing can be easily performed, and crushing efficiency can be increased. Moreover, since the solidified slag after the first crushing is classified by the first classification step S5 before the second crushing step S7 by the impact crusher such as an impact crusher, the yield and efficiency in the second crushing step S7 are improved. Can be improved.

Next, the concrete coarse aggregate manufacturing apparatus 50 used in the above method for producing a concrete coarse aggregate will be described.
As shown in FIG. 3, the coarse aggregate manufacturing apparatus 50 for concrete according to the present embodiment includes a solidified slag manufacturing apparatus 51 that manufactures solidified slag and a solidified slag manufactured by the solidified slag manufacturing apparatus 51 at a predetermined height. The first crushing device 53 that crushes the solidified slag by being dropped from the first crusher, the first classifying device 55 that classifies the solidified slag crushed by the first crushing device 53, and a predetermined size classified by the first classifying device 55 A second crushing device 57 composed of an impact crushing device that crushes the below solidified slag and a second classifying device 59 for classifying the solidified slag crushed by the second crushing device 57 into 5 to 20 mm are provided. What is classified by the second classifying device 59 is the coarse aggregate 60 for concrete.
Moreover, in this Embodiment, the 3rd crushing apparatus 61 which crushes 150 mm or more of solidification slag classified by the 1st classification apparatus 55 is provided.
Hereinafter, each device will be described in detail.

<Coagulated slag production equipment>
As shown in FIGS. 4 to 6, the solidification slag manufacturing apparatus 51 includes an apparatus (horizontal circulation type solidification) including a horizontal circulation movement mechanism that moves around a horizontal direction in a state where a plurality of molds 5 are brought close to each other and supported. The slag manufacturing apparatus 1) may be used, or as shown in FIG. 7, it may be an apparatus (an endless solidified slag manufacturing apparatus 31) in which a plurality of molds are linearly connected endlessly.
Hereinafter, the structure of the horizontal circulation type solidified slag manufacturing apparatus 1 and the endless type solidified slag manufacturing apparatus 31 will be described.

《Horizontal circulation type solidified slag production equipment》
The horizontal revolving solidified slag manufacturing apparatus 1 (FIG. 4) supports a plurality of metal molds 5 having recessed portions 5a (FIG. 5) into which the molten slag 3 is poured so as to be able to revolve, An apparatus for continuously producing the solidified slag by pouring the molten slag 3 into the recessed portion 5a and continuously rotating the operation for each round,
A circular movement mechanism 7 is provided that moves in a horizontal direction in a state where a plurality of molds 5 are brought close to each other and supported, and the circular movement mechanism 7 holds the molten slag 3 poured into the concave portion 5a during one round of the apparatus. In this state, the air-cooling moving part 9 that moves the mold 5 in the circumferential direction to air-cool and solidify, and the reversing discharge part 11 that inverts the mold 5 so that the recessed part 5a faces downward to discharge the solidified slag, An inversion moving unit 13 that moves the inverted mold 5 in an inverted state and a reinversion unit 15 that reinverts the inverted mold 5 so that the recessed portion 5a faces upward are provided. The re-inversion moving part 17 is provided for moving the re-inverted mold 5 to a portion into which the molten slag 3 is poured as required.
In addition, the horizontal circulation type solidification slag manufacturing apparatus 1 is good to install the rod 20 so that the molten slag 3 may be easily poured into the mold 5.
Hereinafter, each configuration will be described in detail.

〔template〕
The mold 5 has a shallow concave portion 5a into which the molten slag 3 is poured. More specifically, as shown in FIG. 5, the mold 5 is preferably a metal container having a substantially trapezoidal recessed portion 5a. As shown in FIG. 4, the mold 5 of the present embodiment is arranged close to each other so that a plurality of molds 5 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 5 is arranged in a circumferential shape, the shape of the mold 5 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 5 is preferably rectangular.

The inner wall of the mold 5 may have an inclined surface 5b that is inclined outward from the bottom toward the top. This is to make the solidified slag easy to release when the mold 5 is inverted.
Moreover, when casting the molten slag 3, the mold 5 may be provided with a slag fall prevention site 5 c for preventing the molten slag 3 from dropping into the gap between the adjacent molds 5 (see FIG. 5).
The material of the mold 5 is made of a metal having excellent heat resistance such as cast steel or stainless steel. The thickness of the mold 5 is preferably about 40 mm, for example. If the thickness of the mold 5 is too thin, it is likely to be deformed by the heat of the high-temperature slag, causing troubles in conveyance. Therefore, it is preferable to set it to at least 20 mm or more, and conversely, if it becomes 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 a coarse aggregate for concrete so that it may mention later, 20-40 mm is preferable for the thickness of solidification slag. In order to manufacture a solidified slag having such a solidified thickness, the depth of the recessed portion 5a of the mold 5 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 5 in a circular shape in the proximity state and moves them around. The support mechanism for supporting the mold 5 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 5, 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 FIG. 4 and FIG. 6, the orbiting movement mechanism 7 is arranged in the order of the air-cooling movement unit 9, the reversal discharge unit 11, the reversal movement unit 13, and the re-reversing unit 15. And a re-inversion moving unit 17 as necessary.
Hereinafter, each part of the circular movement mechanism 7 will be described in detail.

(Air-cooled moving part)
The air-cooling moving unit 9 is a part that moves the casting mold 5 in the circumferential direction in a state where the poured molten slag 3 is held in the recessed portion 5a to air-cool and solidify the molten slag 3.
The air-cooling moving unit 9 requires time until the poured molten slag 3 is air-cooled and becomes a predetermined solidified state, but the orbiting moving mechanism 7 of the present embodiment circulates the mold 5 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 5 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 part)
The reverse discharge part 11 is a part which discharges the solidified slag 18 by inverting the mold 5 so that the recessed part 5a faces downward.
As shown in FIG. 4, the reverse discharge unit 11 is disposed next to the air-cooling moving unit 9, and is below the mold 5 around which the fall pit 19 that accommodates the solidified slag 18 that is discharged and falls circulates. Is provided. The pit 19 corresponds to the first crushing device 53 in the present invention. The details of the drop pit 19 will be described later.
The mechanism for reversing the mold 5 is not particularly limited. For example, as described in the explanation of the circular movement mechanism 7 above, the mold 5 is rotatably supported when the shaft is supported on the rail via the wheels. In addition, the air-cooling moving unit 9 is provided with a holding unit that holds the posture of the mold 5 so that the mold 5 does not rotate. Subsequently, when the mold 5 comes to the reverse discharge unit 11, the posture of the mold 5 is set. What is necessary is just to provide the guide part which guides so that it may reverse.

  In addition, as shown in FIG. 4, it is preferable that the reversal direction of the casting_mold | template 5 is rotated toward the rotation direction and reversed. If the mold 5 is rotated in the rotating direction and reversed, the center of gravity shifts with respect to the center of rotation, for example, when the mold 5 of Patent Document 2 is tilted in the radial direction of the rotating direction, and the balance of the entire rotating device. There is no problem of collapse. The rotation of the mold 5 in the circumferential direction may be forward rotation or reverse rotation.

(Reverse moving part)
The inversion moving unit 13 is a part that moves the mold 5 that has been inverted and discharged the solidified slag in an inverted state. As shown in FIG. 4, the reversal moving unit 13 is preferably provided with a cooling device 21 that cools the mold 5 by injecting a coolant from the upper side and the lower side of the mold 5.
Specifically, from the upper side and the lower side, it is preferable to spray the cooling water, mist, or cooling gas on the mold 5 with a nozzle or the like reversed. It is better to cool it by spraying it.
In the present embodiment, the mold 5 is inverted and cooled while the recessed portion 5a is positioned downward, so that the cooling water naturally falls and water does not remain in the mold 5 as it is. Accordingly, when the molten slag is poured again into the mold after re-inversion, as in the case where the cooling water remains in the mold 5, a large number of pores are generated in the solidified slag, so that it cannot be applied as a coarse aggregate for concrete. The problem disappears. Further, there is no danger of causing a steam explosion, and a high-quality solidified slag 18 can be manufactured safely.

In addition, by cooling the mold 5 from both the upper side and the lower side, the cooling time can be shortened as compared with cooling from only one side. Therefore, the length of the reversal moving unit 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.
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 5 from both the upper and lower surfaces greatly contributes to downsizing of the entire apparatus.
In addition, since the mold 5 can be cooled evenly by cooling the mold 5 from both the upper and lower surfaces, there is an excellent effect that the mold 5 can be prevented from being deformed by heat shrinkage due to cooling. Since the deformation of the mold 5 becomes an important problem in performing these operations stably for the circular movement and reversal, sufficient cooling of the mold 5 is essential for the operation of this apparatus.

  As described above, the cooling of the mold 5 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.

(Re-inversion part)
The re-inversion part 15 is a part that re-inverts the mold 5 in the inverted state so that the recessed part 5a faces upward. The re-inversion portion 15 is preferably provided after the inversion moving portion 13 and after the cooling water does not remain in the recessed portion 5 a of the mold 5.
That is, as shown in FIG. 4, after cooling by the cooling device 21, it is preferably reversed by a predetermined distance and then reversed again. The reason for this is that by reversing and moving by a predetermined distance after cooling, the moisture remaining during cooling during the reversing movement partly falls spontaneously from the mold 5 and part of the mold 5 that has discharged hot solidified slag. It is because it evaporates by heat and is completely removed.

  In addition, the mechanism in which the casting_mold | template 5 is re-inverted is not specifically limited, For example, the mechanism similar to the inversion discharge part 11 mentioned above is employable. In addition, as shown in FIG. 4, the re-reversing direction of the mold 5 is preferably re-reversed by rotating in the circumferential direction as in the case of the reversing discharge unit 11. Further, the rotation of the mold 5 in the rotating direction may be either forward rotation or reverse rotation.

(Re-inversion moving part)
The reinversion moving unit 17 is a part that moves the reinverted mold 5 to a part into which the molten slag 3 is poured.
Note that if the molten slag 3 is poured immediately after the mold 5 is re-inverted by the re-inversion unit 15, the re-inversion moving unit 17 may not be provided.

An example of a method for producing solidified slag using the horizontal circulating solidified slag manufacturing apparatus 1 of the present embodiment configured as described above will be described together with the operation of the horizontal circulating solidified slag manufacturing apparatus 1.
The orbiting movement mechanism 7 is rotated at a predetermined speed, and the molten slag 3 is poured into the circulating mold 5 at the molten slag inflow portion during one round of the apparatus, and the mold 5 into which the molten slag 3 is poured is air-cooled and moved. The molten slag 3 moves through the part 9 and is cooled by air to become solidified slag.
The mold 5 that has arrived 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 drop pit 19. The mold 5 from which the solidified slag 18 has been discharged moves the reversal moving unit 13 in a reversed state, and is cooled by the cooling device 21 in the middle of the movement.
The mold 5 that has passed through the inversion moving unit 13 rotates in the circumferential direction in the reinversion unit 15 and reinverts so that the recessed portion 5a faces upward. The molten slag 3 is poured into the re-inverted mold 5 immediately after re-inversion or after moving the re-inversion moving part 17 again at the slag inflow part.

As described above, the solidified slag manufacturing apparatus according to the present embodiment includes the orbiting movement mechanism 7 that orbits the plurality of molds 5 in the horizontal direction while being supported in the proximity state, and the apparatus 1 of the orbiting movement mechanism 7. During the circumference, the air-cooled moving part 9 for air-cooling and solidifying, the reversing discharge part 11 for reversing the mold 5 so that the recessed part 5a faces downward and discharging the solidified slag 18 and the reversed mold 5 are reversed. The mold is linearly endless by including the reversal moving part 13 for moving the mold 5 in the state and the re-inversion part 15 for re-reversing the mold 5 in the reversed state so that the recessed part 5a faces upward. The total circumferential length of the device is not limited by the required length of the air cooling process for slag solidification as in the example of connection, and the length in the circumferential direction required for each part such as the reverse discharge unit 11 following the air cooling moving unit 9 is set. Allotted to the length of the air-cooled moving part 9 except Rukoto becomes possible, wasted time does not occur in the circumferential stroke.
Further, in the present embodiment, the mold 5 is cooled from the upper and lower surfaces in the reversal moving unit 13, so that the mold 5 can be efficiently cooled, thereby shortening the length of the reversal moving unit 13. 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.

In the above example, as shown in FIG. 4, an example in which the circulation direction is clockwise is shown. However, the circulation direction of the solidified slag manufacturing apparatus in the present invention is not limited to this, and the air cooling moving unit, the reverse discharge unit , The reverse moving unit, the re-inverting unit, and, if necessary, the re-inverting 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.

《Endless solidified slag production equipment》
As shown in FIG. 7, the endless solidified slag production apparatus 31 circulates a plurality of molds 39 into which molten slag 37 is injected from a slag pan 33 through a slag tub 35 and a plurality of molds 39 in a linear endless manner. A rotating mechanism 41 for spraying and a watering nozzle 43 for spraying cooling water on the mold are provided.

In the endless solidified slag manufacturing apparatus 31 as described above, the molten blast furnace slag is supplied into the mold 39 installed in the rotating mechanism 41 by driving the rotating mechanism 41, thereby obtaining a plate-shaped solidified slag having a predetermined thickness. Can be produced continuously.
At the uppermost part of the revolving mechanism 41, the plate-shaped solidified slag is dropped into the drop pit 19 by reversing the mold 39.
The inverted mold 39 is sprinkled on the mold surface from the water nozzle 43 to cool the mold 39.

<First crusher>
The first crushing device 53 is a device that drops the solidified slag produced by the solidified slag producing device 51 from a predetermined height and crushes the solidified slag by the action of gravity.
As an example of the first crushing device 53, there is the drop pit 19 shown in FIGS. It is preferable to lay an iron plate 45 on the floor of the pit in order to promote crushing.
The drop height difference is preferably 4.5 m or more. According to the inventor's experiment, by continuously dropping the solidified slag from 4.5 m, the crushed solidified slag gradually accumulates, but eventually becomes a mountain shape of about 2 m. Therefore, by ensuring 4.5 m as the height difference of the drop pit 19, the height difference of 2 m can be finally maintained, and the solidified slag can be roughly crushed as the first crushing step S <b> 3. It is.

<First classification device>
The first classifying device 55 is a device that classifies the solidified slag roughly crushed by the first crushing device 53. Examples of the first classifier 55 include a grizzly feeder 46 shown in FIGS.
The grizzly feeder 46 is provided with a sieve lattice (grizzly) 48 in front of the vibration feeder portion 47. When the coagulated slag roughly crushed by the first crushing device 53 is supplied to the vibration feeder unit 47 by a heavy machine, the supplied coagulated slag 18 is conveyed forward and sieved by the sieve lattice 48 and has a size of 150 mm or less. However, it falls to the front, and those larger than 150 mm pass through the sieve lattice 48 and fall forward.

<Second crushing device>
The second crushing device 57 is a device including an impact crushing device that crushes the solidified slag of 150 mm or less classified by the first classifying device 55.
Examples of the impact crusher include an impact crusher and a hammer crusher. The reason why the impact crushing device is used as the second crushing device is that, as described above, the corners of the solidified slag after crushing can be taken and it is suitable as a coarse aggregate for concrete.
Since the second crushing device 57 is charged with a solidified slag of 150 mm or less classified by the first classifying device 55, the crushing efficiency is high and the yield can be improved.

<Third crusher>
The 3rd crushing apparatus 61 is an apparatus which crushes 150 mm or more solidified slag classified by the 1st classification apparatus 55, Comprising: A compression crushing apparatus like a jaw crusher is mentioned.
The third crushing device 61 has a function of supplementing the first crushing device 53 for which crushing was insufficient.
By providing the third crushing device 61 and crushing the solidified slag that could not be crushed smaller than 150 mm by the first crushing device 53 again and supplying it to the second crushing device 57, the efficiency and yield of the second crushing device 57 can be improved. It can be improved further.

<Second classifier>
The second classifying device 59 is a device that classifies the solidified slag crushed by the second crushing device 57 into 5 to 20 mm. The second classifying device 59 includes a first vibrating screen that screens the solidified slag crushed by the second crushing device 57 to 20 mm or less, and a 20 mm or less solidified slag that is sieved by the first vibrating screen through a 5 mm sieve screen. This is a device that leaves 5-20 mm of solidified slag on the sieve.

The effects of the method and apparatus for producing a coarse aggregate for concrete according to the present invention will be described based on specific examples.
In this example, the horizontal circulation type solidified slag manufacturing apparatus 1 shown in FIGS. 4 to 6 was used. The mold 5 is made of cast steel with 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, the length of the lower base short side of the trapezoid outer diameter is 1.0 m, and the outside of the trapezoid The height of the diameter was 2.7 m. Moreover, the depth of the recessed part 5a of the casting_mold | template 5 was 100 mm.
The circular movement mechanism 7 is the same as that shown in FIG. 4, and the conveyance speed for circular conveyance is 14 m / min at the mold center.
At the slag inflow site, molten blast furnace slag of 1360 ° C. or higher and 1410 ° C. or lower was flowed into the mold 5 at about 2 t / min.
The mold 5 into which the molten slag 3 has been poured conveys the air-cooling moving part 9 for about 120 seconds {the length of the air-cooling moving part is 2/3 (240 degrees) of the entire circumference}, and the molten slag 3 is solidified by air cooling. .

As described in the embodiment, in the reverse discharge unit 11, the mold 5 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 casting mold 5 from which the solidified slag 18 was discharged was moved while the reversing movement unit 13 was in the reversing state, and cooled rapidly by jetting cooling water from the upper and lower surfaces at the site where the cooling device 21 was installed.
The surface of the mold 5 in the inverted state immediately after discharging the solidified slag was in a high temperature state exceeding 300 ° C. while being in contact with the solidified slag 18. It was possible to rapidly cool to a temperature of 200 ° C. or lower.
The mold 5 after cooling is conveyed through the reversal moving unit 13 with the recessed part 5a of the mold 5 facing downward, and during this time, water remaining during water cooling partly falls from the mold 5 and part of the mold 5 Evaporated by residual heat of 5 and removed completely.

  The temperature of the mold becomes the highest temperature just before the slag is inverted and dropped. At that time, the surface temperature of the mold back surface measured by the radiation thermometer (the upper surface of the inverted mold, that is, the back surface of the mold) is 300. If the temperature exceeds ℃, the proof stress may be reduced and the mold 5 may be deformed. Therefore, the amount of water spray and water spray time are increased to increase the temperature drop of the mold due to cooling water injection. It is desirable that the surface temperature of the back surface of the glass be 300 ° C. or lower.

  Subsequently, the mold 5 in the inverted state was re-inverted by the re-inversion part 15 and returned to the state in which the original recessed part 5a was directed upward again. Thereafter, molten slag was poured again into the returned mold. The above process was repeated 5 times for one slag pan 33, and 30 tons of molten slag was continuously processed.

After the slag dropped from the inverted mold was recovered from the pit 19, the solidification thickness was measured to be 20 to 30 mm, and the average thickness was 25 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 horizontal circulation type 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 order to make the solidified slag produced as described above into a coarse aggregate for concrete, the plate-shaped solidified slag 10t is sieved with a grizzly feeder as the first classifier 55, and then solidified to 150 mm or less. The slag was crushed using an impact crusher. Then, the crushed slag was classified with a sieve of 20 mm and 5 mm by the first vibration feeder and the second vibration feeder which are the second classifier 59. Thereby, the coarse aggregate for concrete of 20-5 mm was able to be manufactured.
The water absorption rate of the manufactured coarse aggregate was 0.9%, which was significantly smaller than the water absorption rate of the conventional blast furnace slag coarse aggregate of 3 to 4%, which was equivalent to that of natural aggregate.
The water absorption rate of the coarse aggregate is preferably 1% or less.

S1 Solidification slag manufacturing process S3 1st crushing process S5 1st classification process S7 2nd crushing process S9 2nd classification process S11 3rd crushing process 1 Horizontal circulation type solidification slag manufacturing apparatus 3 Molten slag 5 Mold 5a Recessed part 5b Inclined surface 5c Slag fall prevention part 7 Circumferential movement mechanism 9 Air cooling movement part 11 Reverse discharge part 13 Reverse movement part 15 Reinversion part 17 Reinversion movement part 18 Solidification slag 19 Falling pit 20 ２１ 21 Cooling device 31 Endless solidification slag production equipment 33 Slag Pan 35 Slag bowl 37 Molten slag 39 Mold 41 Circulation mechanism 43 Water spray nozzle 45 Iron plate 46 Grizzly feeder 47 Vibrating feeder 48 Sieve lattice 50 Coarse aggregate production equipment 51 Solidification slag production equipment 53 First crushing equipment 55 First classification equipment 57 Second crusher 59 Second classifier 61 Third crusher apparatus

Claims (17)

A plurality of metal molds having recessed portions into which molten slag is poured are supported so as to be able to move around, and the concrete slag is produced using a solidified slag production apparatus that continuously produces solidified slag by pouring molten slag into the recessed portions. A method for producing aggregates, comprising:
A solidified slag production process for producing solidified slag by the solidified slag production apparatus, a first crushing process for crushing the solidified slag by dropping the solidified slag produced by the solidified slag production apparatus from a predetermined height; A first classification step of classifying the solidified slag crushed in the crushing step; a second crushing step of crushing the solidified slag of a predetermined size or less classified by the first classification step with an impact crushing device; A method for producing a coarse aggregate for concrete, comprising a second classification step of classifying the solidified slag crushed in the crushing step to 5 to 20 mm.   A third crushing step of crushing a solidified slag of a predetermined size classified in the first classification step with a compression crushing device; wherein the first classification step is in addition to the solidified slag crushed in the first crushing step The method for producing a coarse aggregate for concrete according to claim 1, wherein the solidified slag crushed in the third crushing step is classified.   The said 1st classification process classifies with 150 mm-200 mm, The manufacturing method of the coarse aggregate for concrete of Claim 1 or 2 characterized by the above-mentioned.   The method for producing a coarse aggregate for concrete according to any one of claims 1 to 3, wherein a thickness of the solidified slag produced by the solidified slag production apparatus is 40 mm or less. The solidified slag manufacturing apparatus includes a revolving mechanism that revolves horizontally in a state where the plurality of molds are brought close to each other and supported,
The circulatory moving mechanism moves the mold in the circulatory direction while holding the molten slag poured in the recess during one round of the apparatus, and air-cooled moving part for cooling and solidifying the molten slag by air, and the mold The reversing discharge part for discharging the solidified slag by reversing so that the recessed part is directed downward, the reversing moving part for moving the reversed mold in the reversed state, and the recessed part above the reversing mold. The method for producing a coarse aggregate for concrete according to any one of claims 1 to 4, further comprising a re-inversion portion that is re-inverted so as to face the surface.   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 method for producing a coarse aggregate for concrete according to claim 5.   The said reverse discharge part reverses a casting_mold | template by rotating the said casting_mold | template toward a rotation direction, The manufacturing method of the coarse aggregate for concrete of Claim 5 or 6 characterized by the above-mentioned.   The method for producing a coarse aggregate for concrete according to any one of claims 5 to 7, further comprising a cooling device that cools the upper and lower surfaces of the mold in the inverted state by injecting a coolant.   The said cooling device cools the said casting_mold | template so that the surface temperature of a casting_mold | template back surface may be 300 degrees C or less, The manufacturing method of the coarse aggregate for concrete of Claim 8 characterized by the above-mentioned. A plurality of metal molds having recessed portions into which molten slag is poured are supported so as to be able to move around, and molten slag is poured into the recessed portions in one round of the apparatus to produce solidified slag, and the operation for each round is circulated. A solidified slag production apparatus that performs continuously,
A first crushing device for crushing the solidified slag by dropping the solidified slag produced by the solidified slag producing device from a predetermined height; a first classifying device for classifying the solidified slag crushed by the first crushing device; A second crushing device comprising an impact crushing device that crushes the solidified slag of a predetermined size or less classified by the first classifying device, and a second crushing device that classifies the solidified slag crushed by the second crushing device to 5 to 20 mm. An apparatus for producing coarse aggregate for concrete, comprising a two-classifier.   A compression crushing device for crushing the solidified slag exceeding a predetermined size classified by the first classifying device, wherein the first classifying device includes the solidified slag crushed by the first crushing device and the compression crushing device; The apparatus for producing a coarse aggregate for concrete according to claim 10, wherein the crushed solidified slag is classified.   The apparatus for producing coarse aggregate for concrete according to claim 10 or 11, wherein the solidified slag produced by the apparatus for producing solidified slag has a thickness of 30 mm or less. The solidified slag manufacturing apparatus includes a revolving mechanism that revolves horizontally in a state where the plurality of molds are brought close to each other and supported,
The circulatory moving mechanism moves the mold in the circulatory direction while holding the molten slag poured in the recess during one round of the apparatus, and air-cooled moving part for cooling and solidifying the molten slag by air, and the mold The reversing discharge part for discharging the solidified slag by reversing so that the recessed part is directed downward, the reversing moving part for moving the reversed mold in the reversed state, and the recessed part above the reversing mold. The apparatus for producing a coarse aggregate for concrete according to any one of claims 10 to 12, further comprising a re-inversion portion that re-inverts the re-inversion so as to face the surface.   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 apparatus for producing coarse aggregate for concrete according to claim 13.   The said reverse discharge part reverses a casting_mold | template by rotating the said casting_mold | template toward the rotation direction, The manufacturing apparatus of the coarse aggregate for concrete of Claim 13 or 14 characterized by the above-mentioned.   The coarse aggregate manufacturing apparatus for concrete according to any one of claims 13 to 15, further comprising a cooling device that cools the upper and lower surfaces of the mold in the inverted state by injecting a coolant.   The said cooling device cools the said mold so that the surface temperature of a mold back surface may be 300 degrees C or less, The manufacturing apparatus of the coarse aggregate for concrete of Claim 16 characterized by the above-mentioned.