KR20170057595A - Apparatus and Method for Producing Recycled Aggregate - Google Patents

Abstract

The present invention relates to an apparatus and a method for producing recycled aggregate wherein the apparatus for producing recycled aggregate produces recycled aggregate from construction waste materials such as waste concrete or waste asphalt concrete, effectively removes impurities such as waste paper, waste vinyl sheets, and waste plastic materials mixed in the recycled aggregate, and, at the same time, enables the recycled aggregate to come in continuous contact with carbon dioxide during a transfer process, and thus can increase a recycling rate of the recycled aggregate. The apparatus for producing recycled aggregate comprises: a main chamber (10); a blower (22); an upward movement conveyer belt apparatus (20) which transfers light-weighted impurities upwards and discharges the impurities; a vibration screen device (30) which sieves a ground product with a separation mesh (31); a collection chamber unit (50) which collects the ground product; and a screw mixer apparatus (40) which mixes the ground product with carbon dioxide by operation of a screw and transfers the ground product at the same time while the ground product comes in continuous contact with carbon dioxide. The recycled aggregate is produced while a process for removing the light-weighted impurities and a process for reducing alkalinity as the recycled aggregate comes in contact with carbon dioxide are performed in one apparatus during processes for producing the recycled aggregate from the ground product.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for producing recycled aggregate through reduction of alkalinity and removal of foreign matter by carbon dioxide neutralization reaction in a double mesh spiral conveying process,

The present invention relates to an apparatus and a method for producing recycled aggregate, and more specifically, to a method and apparatus for producing recycled aggregate from construction waste such as waste concrete or waste asphalt concrete, The water and carbon dioxide gas are sprayed on the recycled aggregate in the spiral conveying process using the screw to promote the accelerated carbonation process so that the alkalinity of the recycled aggregate can be effectively reduced to improve the recycling ratio of the recycled aggregate Quot; a method for producing a recycled aggregate through the reduction of alkalinity and removal of foreign matter by carbon dioxide neutralization reaction in a double net spiral conveying process, and a recycling aggregate production method ".

The amount of construction waste generated due to the dismantling and new construction of structures is also increasing every year. In order to recycle construction wastes, which is the largest amount of domestic wastes, national recycling of waste concrete or recycled aggregate that is produced by shredding waste asphalt concrete is being actively recycled.

The recycled aggregate has cement on its surface. When the recycled aggregate attached to the surface of the cement is exposed to air or reacted with water, the pH rises sharply and becomes strong alkaline. During the process of shredding and transporting construction waste, recycled aggregate contains foreign materials such as waste paper, waste vinyl, and waste plastics. Therefore, in order to effectively produce recycled aggregate, which is valuable as a resource, in order to promote the recycling of construction waste such as waste concrete, it is necessary to improve the quality by removing the foreign matter mixed in the recycled aggregate, and to solve the problem that the recycled aggregate has high pH do.

Various conventional apparatuses and methods have been developed for promoting recycling of recycled aggregate materials. However, only recycled recycled aggregate materials have been used by removing only foreign substances contained in the recycled aggregate material or by physical methods such as crushing . In order to reduce the alkalinity of the recycled aggregate, there has been developed a technique for carbonating the recycled aggregate by contacting it with carbon dioxide gas, and an example thereof is disclosed in Korean Patent No. 10-0970431.

However, in this prior art, since the foreign matter separating apparatus using the nets and the like and the apparatus for carbonating the recycled aggregate are separate devices, in order to separate foreign matters from the recycled aggregate and reduce the alkalinity of the recycled aggregate, The foreign matter separation process and the alkali reduction process must be sequentially performed separately. Therefore, in order to provide a separate apparatus in the prior art, it is necessary to secure a large working space. In order to continuously carry out the two processes, a conveyor for feeding the circulating aggregate completed in the first step to the apparatus for the next step The same additional conveying member was required. Therefore, it has been a long time to produce the recycled aggregate by this conventional technique, and the cost is high and the economical efficiency of the recycled aggregate is not good.

Particularly, in the prior art, in order to reduce the alkalinity of the recycled aggregate, carbon dioxide is directly supplied to the recycled aggregate to be contacted. In this process, the amount of carbon dioxide lost to the atmosphere without contacting the recycled aggregate is very large. As a result, There is a problem that the amount of carbon dioxide to be produced for the treatment of the recycled aggregate is increased and the cost is increased accordingly.

Korean Patent No. 10-0970431 (2010. 07. 15. Announcement).

The present invention has been developed in order to overcome the problems of the prior art as described above. Specifically, in the production of recycled aggregate by recycling the construction waste, the foreign matter separation process and the alkali reduction process are simultaneously performed in one device, The present invention aims to improve the economical efficiency of the recycled aggregate by reducing the cost of separating the process and the individual installation of the apparatus for each process and minimizing the installation space of the apparatus for producing the recycled aggregate.

The present invention also aims at solving the problem of excessive loss of carbon dioxide caused by the process of directly supplying carbon dioxide to the recycled aggregate and bringing the carbon dioxide into contact with the carbonaceous material, thereby causing adverse effects on global warming, and an excessive cost for producing carbon dioxide .

In order to achieve the above object, the present invention provides a method of removing alkalescence of recycled aggregate after removing lightweight foreign matter such as waste paper mixed with pulverized material by applying wind force to the pulverized product of construction waste such as waste concrete or waste asphalt concrete, , The pulverized material having a size of 20 mm or less and the pulverized material having a size of 20 mm or less which is a main cause of alkaline development are separated and the pulverized material having a size of 20 mm or less is continuously contacted with carbon dioxide gas, To thereby produce a recycled aggregate.

To achieve the above object, according to an aspect of the present invention, there is provided a method of manufacturing a plasma display panel, including: a main chamber having a pulverized material inlet through which pulverized material of construction waste is introduced; A blower installed in the main chamber below the pulverized water inlet to blow air into the pulverized material; When a lightweight foreign substance contained in the pulverized material which is placed in the pulverized material input port and installed in the main chamber under the pulverized material input port is closely attached to the belt by the wind of the blower, the closely adhered light foreign material is conveyed upward, An upwardly moving conveyor belt device for discharging to the outside of the chamber; A vibrating screen device disposed below the upward moving conveyor belt device in the main chamber and having a separating net so that the pulverized material dropped from the pulverized material inlet is squeezed by the separating net; A collecting chamber part provided at one end of the vibrating screen device to collect the pulverized material passing through the separating net; And a screw mixer device for supplying carbon dioxide gas to the inner space and moving the pulverized material supplied through the collecting chamber part by a screw action in contact with the carbon dioxide gas. There is provided a recycling aggregate producing apparatus characterized in that a recycling aggregate is produced by a lightweight foreign matter removing process and a process in which carbon dioxide gas is contacted with recycled aggregate to reduce alkali in one apparatus.

In particular, in the recycled aggregate production apparatus of the present invention, the screw mixer device comprises: a cylindrical inner tube having an inner surface screw and an outer surface screw on the inner and outer surfaces, respectively, and made of a mesh member capable of sintering the pulverized material; An outer casing disposed outside the inner tube and having a discharge port at a rear end thereof; And a rotating shaft connected to the inner tube and rotating the inner tube; The front side end of the inner tube is rotatably connected to the lower end of the collection chamber portion and the inside of the collection chamber portion and the inside of the inner tube are communicated with each other so that the pulverized material falling into the collection chamber portion is supplied into the interior of the inner tube; The pulverized material supplied to the inner pipe is sieved by the inner wall of the inner pipe, and the pulverized material passing through the net is present between the inner pipe and the outer pipe; The pulverized material existing inside the inner tube by the sieve is conveyed backward by the inner surface screw and the pulverized material between the outer surface of the inner tube and the inner surface of the outer tube is conveyed backward by the outer surface screw, And a rod-shaped coupling bridge member is provided between the inner surfaces so that the rotating shaft and the inner tube can be integrated by the coupling bridge member.

Further, in the present invention as described above, the separating net disposed below the upward moving conveyor belt device may have a mesh of 20 mm in size, and the belt of the upward moving conveyor belt device may be a mesh-type belt having a net.

According to another aspect of the present invention, there is provided a method of producing a recycled aggregate using the recycled aggregate production apparatus.

According to the present invention, the foreign matter mixed in the pulverized product is separated and discharged from the circulating aggregate by the blower and the upward moving conveyor belt device. The circulating aggregate larger than the predetermined reference size is separately separated by the vibration screen device and discharged outside, The recycled aggregate having a size smaller than the size of the recycled aggregate is discharged as a recycled aggregate which is neutralized by contact with moisture and carbon dioxide (CO ₂ ) continuously in the course of flowing into the screw mixer apparatus through the vibration screen apparatus and the collecting chamber, It is constituted such that the process of sorting out lightweight foreign matter and the process of reducing alkali by contact of carbon dioxide gas of recycled aggregate are carried out in a single device. Therefore, compactness of the device is achieved, , Thereby improving the economical efficiency of the recycled aggregate The effect is also demonstrated.

Further, in the present invention, since the recycled aggregate comes into contact with the carbon dioxide gas in the screw mixer device, the loss of the carbon dioxide gas is small and the recirculation and recycling are facilitated. Accordingly, the carbon dioxide gas is dispersed in the air, Thereby minimizing the problem of promoting global warming and reducing the amount of the carbon dioxide gas used, thereby significantly reducing the cost of the gasoline gas.

In addition, in the apparatus according to the present invention, the pulverized material is smoothly conveyed by the screw by performing additional sieving according to the size of the pulverized material in the process of conveying the pulverized material in a spiral manner. At the same time, there is an advantage that the efficiency of carbonation can be improved by increasing the contact area with the carbon dioxide gas through the further pulverization of the pulverized product.

1 is a schematic side view showing the construction of a recycled aggregate production apparatus according to the present invention.
FIG. 2 is a schematic perspective view showing only one embodiment of a collection chamber portion and a screw mixer device indicated by circle A in FIG. 1; FIG.
3 is a schematic lateral cross-sectional perspective view taken along line BB of FIG.
4 is a schematic cross-sectional view along the line CC of Fig.
5 is a schematic flow chart showing a process of producing recycled aggregate using the recycled aggregate production apparatus according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Although the present invention has been described with reference to the embodiments shown in the drawings, it is to be understood that the technical idea of the present invention and its essential structure and operation are not limited thereby. For reference, the term "waste concrete" in the following description is used to mean not only ordinary waste concrete but also waste asphalt concrete.

Fig. 1 shows a schematic side cross-sectional view showing the construction of a recycled aggregate production apparatus 1 according to the present invention. Fig. 2 shows a schematic view of a collection chamber portion 50 and a screw mixer device 40, FIG. 3 is a schematic cross-sectional half-sectional perspective view taken along the line BB of FIG. 2. As shown in FIG. 4 is a schematic cross-sectional view taken along the line C-C of Fig. 5 is a schematic flow chart showing a process of producing recycled aggregate using the recycled aggregate production apparatus 1 according to the present invention.

In the recycled aggregate production apparatus 1 according to the present invention, a process of separating and removing lightweight foreign substances such as waste paper, waste vinyl, and waste plastics from pulverized products of construction waste such as waste concrete and the like, An alkali reduction process is performed by contact between the aggregate and the carbon dioxide gas. Specifically, the apparatus for producing recycled aggregate 1 according to the present invention comprises a main chamber 10 having a pulverized material inlet 11 formed at an upper portion thereof, A blower 22 installed below the pulverizing material inlet 11 in the main chamber 10 to feed the pulverized material into the pulverizing material inlet 11, An upward moving conveyor belt device 20 which is pressed and moved by light blowing from the water and a separating net 31 arranged in the main chamber 10 for sorting the pulverized material from the pulverized material in size, A collecting chamber part 50 provided at one end of the vibrating screen device 30 for collecting the pulverized material having passed through the separation net 31; Spiral movement with internal moisture Carbon dioxide gas is supplied are formed by the pulverized comprises a screw-mixer device (40) into contact with carbon dioxide gas continuously and in a state in which the water present in the process of being moved by a screw operation.

Specifically, the main chamber 10 is a box-shaped member having a space therein. The main chamber 10 has a crushing water inlet 11 through which crushed material is introduced. In the pulverized water inlet 11, pulverized pulverized construction waste such as waste concrete is added for the production of recycled aggregate.

A blower 22 and an upwardly moving conveyor belt device 20 are provided in the main chamber 10 below the pulverized water inlet 11. The blower 22 is located in front of the upwardly moving conveyor belt device 20 and blows strong wind in the belt direction. In the upward moving conveyor belt device 20, the belt moves in the upward direction. In the process of dropping the pulverized material introduced through the pulverized material inlet port 11, lightweight foreign substances such as waste paper, waste plastic, and waste vinyl mixed in the pulverized material are moved upward by the wind of the blower 22 20). Particularly, the pulverized material introduced into the pulverized material inlet port 11 can be hit by the belt of the up-shifting conveyor belt device 20 while being dropped. When the fall object hit on the belt is repelled again, the light- Is moved by the wind of the upward movement conveyor belt device (20) and is pressed against the belt of the upwardly moving conveyor belt device (20) or is blown backward of the upwardly moving conveyor belt device (20) (12) to the outside of the main chamber (10).

Since the belt moves in the upward direction in the upward moving conveyor belt device 20, the lightweight foreign matter adhering to the belt of the upwardly moving conveyor belt device 20 by the wind of the blower 22 moves upwards with the upward movement of the belt And is discharged to the outside of the main chamber 10 through the foreign matter discharge port 12 formed at the rear of the upward moving conveyor belt device 20. [ When the belt of the upwardly moving conveyor belt device 20 is a mesh-type belt, it is preferable that the upper surface of the belt is blown to the upper surface of the belt As the wind passes through the belt, the lightweight foreign matter is more strongly adhered to the belt surface and can maintain its close contact state. Therefore, the conveyance of the lightweight foreign substance by the upward moving conveyor belt device 20 can be performed very efficiently.

The pulverized material from which the lightweight foreign matter has been removed falls on the upward moving conveyor belt apparatus 20 and then falls down onto the vibration screen apparatus 30 provided in the main chamber 10. [ On the upper surface of the vibration screen device 30, a separation net 31 having a net is provided. In addition, the vibration screen apparatus 30 is provided with a vibration motor (not shown) so as to apply vibration to the separation net 31. Reference numeral 32 denotes a vibration spring 32 provided in the vibration screen apparatus 30. [ The crushed material separated on the upper surface of the vibrating screen device 30, that is, on the separation net 31 is sieved by the separation net 31 to be crushed by the crushed material larger than the mesh of the separation net 31, Or less. Here, the mesh size of the separation net 31 is preferably 20 mm, for example.

The pulverized material having a size which is a major cause of alkaline development in the pulverized material that has fallen on the separation net 31 passes through the separation net 31 and the pulverized material having a larger size remains on the separation net 31. As shown in the drawing, the separation net 31 is inclined downwardly in the opposite direction to the direction in which the upwardly moving conveyor belt device 20 is installed, so that it can not pass through the separation net 31 and remains in the separation net 31 The crushed material (large-size recycled aggregate) moves along the downward slope and is collected separately.

The vibrating screen device 30 is provided with a collecting plate 33 located below the separating net 31. The collecting plate 33 is inclined downward forward. At the lower end of the collecting plate 33 in the downward inclined direction, there is provided a collecting chamber portion 50 in which the pulverized material passing through the separating net 31 is collected. Therefore, the pulverized material passing through the separation net 31 is collected in the collecting plate 33 of the vibrating screen device 30 and moves along the downward inclination of the collecting plate 33 to collect in the collecting chamber part 50. It is preferable that the collecting chamber portion 50 is configured such that its cross section becomes narrower as it goes down.

In the present invention, the lower end of the collection chamber part (50) is connected to the screw mixer device (40). The screw mixer device 40 is a device for feeding the pulverized material collected in the collecting chamber part 50 by a spiral conveying method using a screw in a state in which the pulverized material is continuously in contact with carbon dioxide gas, And an inner surface screw 48 and an outer surface screw 49 on an inner surface and an outer surface, respectively, and is made of a mesh member capable of sintering the pulverized material, and has a cylindrical inner tube An outer tube 42 surrounding the outer tube 41 and an inner tube 41 located at the center of the inner tube 41 and integrated with the inner tube 41 by a coupling bridge member 44 And a rotating shaft 43 which rotates together with the inner tube 41.

One end (front end) of the inner tube 41 is connected to the lower end of the collecting chamber part 50, and the one end (front end) of the inner tube 41 is connected to the lower end of the collecting chamber part 50. The inner tube 41 is a cylindrical member having a mesh- The inner side of the inner tube 50 and the inner side of the inner tube 41 are communicated with each other while the front side end of the inner tube 41 is rotatably connected to the collecting chamber part 50. That is, the cylindrical inner tube 41 is made of a tubular member made of a mesh. When one end of the inner tube 41 is coupled to the collecting chamber part 50, the inner tube 41 is freely rotatable, (50). Reference numeral 52 in the drawing is a bearing member 52 that allows the end of the inner pipe 41 to rotate. Particularly, the inside of the inner pipe 41 and the inside of the collection chamber portion 50 are in communication with each other, so that the pulverized material falling into the collection chamber portion 50 is collected and supplied into the inner pipe 41. For reference, the direction in which the inner tube 41 is connected to the collection chamber portion 50 will be referred to as "forward ", and the opposite direction will be described as" rear ".

On the outer surface and the inner surface of the inner pipe 41, an inner surface screw 48 and an outer surface screw 49, respectively, for transferring the pulverized material to the rear by the spiral conveying method are respectively provided. Therefore, when the inner pipe 41 is rotated, the relatively large-sized crushed material (the crushed material that has not passed through the inner wall of the inner pipe) present inside the inner pipe 41 is conveyed backward by the inner surface screw 48, The relatively small-sized pulverized material (pulverized material passing through the net of the inner tube) present outside the inner pipe 41 is conveyed backward by the outer surface screw 49.

A rotary shaft 43 is disposed at the center of the inner tube 41 so that the inner tube 41 can be rotated. The rotary shaft 43 and the inner tube 41 are integrated. In the embodiment shown in the drawing, the rotating shaft 43 is located at the center of the inner tube, and a rod-shaped coupling bridge member 44 is provided between the rotating shaft 43 and the inner surface of the inner tube 41, 44 integrally formed with the rotary shaft 43 and the inner tube 41 (see Fig. 4). Since the rotary shaft 43 and the inner tube 41 are integrally connected as described above, the inner tube 41 rotates together when the rotary shaft 43 rotates.

In the embodiment shown in the drawing, one end of the rotation shaft 43 projects to the lower end outer surface of the collection chamber portion 50 across the lower end of the collection chamber portion 50, Is connected to the pulley 432 of the rotary motor M by means of a chain 431 so as to transmit power. When the rotary motor M is operated, the rotational power of the chain 431 is transmitted to the rotary shaft 43 through the rotary pulley 430 to rotate the rotary shaft 43, The pulverized material is conveyed backward by the inner surface screw 48 and the outer surface screw 49 while rotating. However, the rotational force for rotating the rotating shaft 43 is not limited to that by the chain 431 as illustrated in the drawings, and may be performed by various methods such as a power transmission gear. Also, the configuration for rotating the rotary shaft 43 may be modified into various other forms.

An outer tube 42 in the form of a cylinder is present outside the inner tube 41. That is, the inner tube 41 is disposed inside the outer tube 42. The front end of the outer tube 42 is connected to the lower end of the collection chamber portion 50 but the inside of the collection chamber 50 and the inside of the outer tube 42 are not communicated with each other. The other end, that is, the rear end of the rotary shaft 43 is rotatably supported at the rear end of the outer tube 42. At the rear end of the outer tube 42, there is formed a discharge port 47 through which the pulverized material transferred backward by the rotation of the inner tube 41 is discharged.

The screw mixer device 40 having the inner pipe 41 and the outer pipe 42 may be arranged horizontally as illustrated in the drawing, but may be arranged to be upwardly inclined so as to gradually increase toward the rear.

Meanwhile, in the present invention, carbon dioxide gas is supplied into the screw mixer device 40 through the rotating shaft 43. To this end, the rotary shaft 43 may be formed of a pipe member (pipe member), and a gas nozzle hole 438 through which the carbon dioxide gas is sprayed may be formed (see FIG. 3). In this case, the carbon dioxide gas is supplied to the hollow interior of the rotary shaft 43 made of the pipe member. It is preferable that the gas nozzle holes 438 are formed evenly spaced over the entire length of the inner tube 41 in the longitudinal direction of the rotary shaft 43. If necessary, when the carbon dioxide gas is supplied to the interior of the screw mixer device 40 through the rotary shaft 43, moisture may be discharged from the rotary shaft 43 together with the carbon dioxide gas. That is, moisture may be supplied to the hollow interior of the rotary shaft 43 along with carbon dioxide gas to cause water to be sprayed through the nozzle hole formed in the rotary shaft 43 in the form of an aerosol. When the moisture is supplied together with the carbon dioxide gas as described above, the effect of reducing the alkali by the contact between the pulverized product and the carbon dioxide gas proceeds more efficiently. In the drawing, the illustration of the carbon dioxide gas and the conduit through which water in spray form is supplied into the rotating shaft 43 is omitted. The nozzle hole for spraying water and the gas nozzle hole for discharging the carbon dioxide gas may be formed on the rotary shaft 43, but the carbon dioxide gas and moisture may be discharged from the same nozzle hole.

In the recycled aggregate production apparatus 1 of the present invention having such a structure, the pulverized material collected in the collecting plate 33 passing through the separation net 31 is dropped to the collecting chamber part 50 and collected at the lower end. Since the front end of the collecting chamber part 50 is connected to the lower end of the collecting chamber part 50 and the inside thereof so that the front end of the collecting chamber part 50 communicates with the inside of the collecting chamber part 50, The crushed material is transported backward by the inner screw 48 of the inner pipe 41. [ At this time, since the inner pipe 41 is made of the mesh member, the sieve is progressed so that the relatively large size of the pulverized material remains in the inner pipe 41, and only the small sized pulverized material remains outside the inner pipe 41 Lt; / RTI > Since the inner pipe 41 is provided with the outer surface screw 49, the crushed material present on the outer surface of the inner pipe 41 is also conveyed backward by the outer surface screw 49 as the inner pipe 41 rotates. Since only the small sized crushed material passing through the net of the inner pipe 41 is present between the outer surface of the inner pipe 41 and the inner surface of the outer pipe 42, when the crushed material is moved by the outer surface screw 49, It is possible to minimize or prevent the occurrence of the phenomenon in which the pulverized material is caught in the gap between the inner surface of the outer tube 49 and the inner surface of the outer tube 42.

The pulverized material gathered in the collecting chamber portion 50 is allowed to flow directly into the inside of the outer tube 42 without the inner tube 41 made of the net member and only the outer tube 42 exists, When the pulverized material is conveyed backward by placing a screw therein, a phenomenon that the pulverized material is caught between the screw and the inner surface of the outer tube 42 may occur. When the pulverized product is sandwiched between the screw and the inner surface of the outer tube 42, the screw is not smoothly rotated and the abrasion is easily caused. The friction between the pulverized product and the inner surface of the outer tube 42 A very unpleasant large noise can be generated. Also, the screw may be overloaded and frequent mechanical malfunctions may occur.

However, in the present invention, the inner tube 41 capable of sieving is disposed inside the outer tube 42 as described above, and only the pulverized material of a small size (for example, powdered powder) is passed through the inner tube 41 The presence of the crushed material between the screw and the inner surface of the outer tube 42 can be originally prevented or minimized by allowing the crushed material to exist in the interval between the inner tube 41 and the outer tube 42. Therefore, Can be prevented. That is, it is possible to prevent the crushed product from being caught between the screw and the inner surface of the outer tube 42, thereby ensuring smooth rotation of the screw, thereby minimizing the wear of the member and preventing or reducing noise due to friction And the overload is prevented from being applied to the screw, so that the possibility of mechanical malfunction can be greatly reduced.

Particularly, in the process of being transported backward by the operation of the inner surface screw 48, relatively large-sized pulverized materials that do not pass through the inner pipe 41 and exist inside the inner pipe 41 act actively Whereby the crushed materials are further divided into smaller sizes, thereby increasing the surface area in contact with the carbon dioxide gas, so that an additional synergistic effect in which carbonation is further promoted is exhibited. The mesh size of the inner pipe 41 can be selected as appropriate and used.

The pulverized material collected at the lower end of the collecting chamber portion 50 flows into the inner pipe 41 and is further squeezed by the net of the inner pipe 41. The inner and outer screws 49 and 49 . As described above, in the present invention, carbon dioxide gas and moisture are supplied through the rotating shaft 43, and carbon dioxide gas and sprayed water are discharged into the screw mixer 40 through the nozzle holes formed in the rotary shaft 43.

Therefore, the pulverized material transferred through the screw mixer device 40 is continuously contacted with the carbon dioxide gas during the transportation while being mixed with the spiral mixer, so that the neutralization by the carbon dioxide gas, that is, the alkali reduction process, Lt; / RTI > That is, a dry alkali reduction process using direct contact of carbon dioxide gas is performed. If necessary, moisture can be sprayed through the rotary shaft 43 as described above.

The pulverized material (recycled aggregate) conveyed by the inner surface screw 48 and the outer surface screw 49 while being continuously in contact with the carbon dioxide gas and in some cases in addition to the carbon dioxide gas and supplied with moisture is contacted with the outer surface 42 And is discharged to the outside through the discharge port 47 formed in the rear of the discharge port. The pulverized material discharged to the discharge port (47) is conveyed through conveying means (not shown) such as a conveyor belt apparatus.

On the other hand, when the net size of the inner pipe 41 is very small and only the pulverized product in the form of fine powder passes between the inner pipe 41 and the outer pipe 42 through the inner pipe 41, It is preferable to attach a member capable of being conveyed backward while sweeping a pulverized powder in the form of powder having a small particle size which is deformable, such as hard rubber. Of course, it is preferable that the member sweeping the pulverized product as described above is attached to the end portion of the outer surface screw 49 in an easily replaceable form.

As described above, the apparatus 1 for producing recycled aggregate according to the present invention includes means for removing lightweight foreign matter and means for continuously reducing the amount of alkali by continuously contacting the recycled aggregate from which the foreign matter has been removed with carbon dioxide gas Respectively. That is, in the single apparatus of the recycled aggregate production apparatus 1 according to the present invention, both the foreign matter removing process and the alkali reduction process are sequentially performed. Therefore, the present invention can solve the problem of insufficient installation space due to having a separate device for performing each of the two processes, and it is possible to solve the problem of additional installation for transferring the recycled aggregate for another process It is not necessary to provide the conveying means. Therefore, according to the present invention, it is possible to easily and economically produce the recycled aggregate having the improved quality by removing foreign matter from a single apparatus. In other words, according to the present invention, since the process for removing foreign substances in the recycled aggregate and the process for reducing alkali are performed in a single apparatus, the apparatus can be made compact, thereby achieving an excellent effect of saving installation space and manufacturing cost .

Particularly, in the apparatus 1 for producing recycled aggregate according to the present invention, the pulverized material is conveyed in a spiral manner while continuously contacting the pulverized material with the carbon dioxide gas, so that the pulverized material is uniformly contacted with the carbon dioxide gas Further, since the additional sieving process proceeds in the process of transferring the pulverized product by the screw mixer device 40, the smooth rotation of the screw and the smooth transfer of the pulverized product can be ensured, and the wear of the member Minimizing the occurrence of friction noise, and preventing the overload of the screw.

10: chamber
20: Upward moving conveyor device
30: Vibrating screen device
40: screw mixer device
41: Inner pipe
42: Appearance
43:
48: Internal screw
49: External screw
50: Collecting chamber part

Claims (8)

A main chamber 10 into which pulverized waste concrete is introduced; An air blower (22) for blowing the pulverized material into the main chamber; An upwardly moving conveyor belt device (20) for upwardly transferring the lightweight foreign substances contained in the pulverized material dropped into the main chamber to the belt by wind, and discharging the pulverized material to the outside of the main chamber (10); A vibrating screen device (30) disposed under the upward moving conveyor belt device and provided with a separation net (31) for screening the pulverized material into a separation net; A collection chamber part 50 provided at one end of the vibration screen device 30 to collect the pulverized material passing through the separation net 31; And a screw mixer device (40) for supplying carbon dioxide gas into the interior of the collecting chamber part (50) and moving the crushed material backward by a screw action while continuously contacting the carbon dioxide gas with carbon dioxide gas;
The screw mixer device 40 includes a cylindrical inner tube 41 having inner and outer surfaces of a screw 48 and an outer surface screw 49 on the inner and outer surfaces thereof and made of a mesh member capable of sintering the crushed material; An outer tube 42 disposed outside the inner tube 41 and having a discharge port 47 at a rear end thereof; And a rotary shaft 43 which is located in the inner pipe 41 and integrated with the inner pipe 41 by the connecting bridge member 44 and rotates together with the inner pipe 41;
The front end of the inner tube 41 is rotatably connected to the lower end of the collecting chamber portion 50 and the inside of the collecting chamber portion 50 and the inside of the inner tube 41 are communicated with each other, The pulverized material supplied to the inner pipe 41 is sieved by the net of the inner pipe 41 and the pulverized material having passed through the net is discharged to the inner pipe 41 Is present between the outer surface (42);
When the rotary shaft 43 rotates, the inner tube 41 rotates together, and the pulverized material remaining in the inner tube 41 due to the squeezing is transferred backward by the inner surface screw 48, (42) is conveyed backward by an outer surface screw (49);
Characterized in that a lightweight foreign matter is removed in the process of producing the recycled aggregate from the pulverized material and that the carbonaceous material and the recycled aggregate come into contact with each other during transportation to reduce the alkali, Recycled aggregate production equipment.
The method according to claim 1,
The rotating shaft 43 is made of a tube member, and carbon dioxide gas is supplied through the hollow inside thereof,
A gas nozzle hole is formed in the rotating shaft 43 so that carbon dioxide gas supplied to the hollow interior of the rotating shaft 43 is supplied into the screw mixer device 40 through the gas nozzle hole. .
3. The method of claim 2,
Water is further supplied to the hollow interior of the rotary shaft 43 and water is sprayed into the interior of the screw mixer 40 through the gas nozzle hole formed in the rotary shaft 43 in a spray form.
4. The method according to any one of claims 1 to 3,
Wherein the separation net (31) has a mesh of 20 mm in size.
5. The method of claim 4,
Wherein the belt of the upward moving conveyor belt device (20) is made of a mesh type belt having a net.
Injecting waste concrete pulverized material into the main chamber 10 having a pulverized water inlet port;
The pulverized material supplied by the blower 22 equipped with the main chamber is blown to bring the light foreign matter blown by the wind into close contact with the belt of the upwardly moving conveyor belt device 20, 10 and the pulverized material falling down without blowing into the wind is squeezed into the separation net 31 of the vibrating screen device 30, which is disposed below the upwardly moving conveyor belt device;
The pulverized product having passed through the separation net 31 is collected in the collection chamber part 50 and then transferred to a screw mixer device 40 having one end connected to the collection chamber 50 and supplied with carbon dioxide gas, The pulverized material is produced as a recycled aggregate in which alkali is continuously reduced while being in contact with carbon dioxide gas while being moved rearward while being mixed by screw action of the screw mixer device 40 while being in contact with carbon dioxide gas;
The screw mixer device 40 includes a cylindrical inner tube 41 having inner and outer surfaces of a screw 48 and an outer surface screw 49 on the inner and outer surfaces thereof and made of a mesh member capable of sintering the crushed material; An outer tube 42 disposed outside the inner tube 41 and having a discharge port 47 at a rear end thereof; And a rotary shaft 43 which is located at the center of the inner pipe 41 and integrated with the inner pipe 41 by the connecting bridge member 44 and rotates together with the inner pipe 41;
The front end of the inner tube 41 is rotatably connected to the lower end of the collecting chamber portion 50 and the inside of the collecting chamber portion 50 and the inside of the inner tube 41 are communicated with each other, The pulverized material supplied to the inner pipe 41 is sieved by the net of the inner pipe 41 and the pulverized material having passed through the net is discharged to the inner pipe 41 (42), respectively;
When the rotating shaft 43 rotates, the inner tube 41 rotates together, and the pulverized product present inside the inner tube 41 is transferred backward by the inner surface screw 48 by the sieve opening, (42) is conveyed backward by an outer surface screw (49);
Characterized in that in the process of producing the recycled aggregate from the pulverized product, the removal of the lightweight foreign matter and the reduction of the alkali by the contact of the carbon dioxide gas and the recycled aggregate in the transferring process are performed in one apparatus, Aggregate production method.
The method according to claim 6,
The rotating shaft 43 is made of a tube member, and carbon dioxide gas is supplied through the hollow inside thereof,
And a gas nozzle hole is formed in the rotating shaft 43 so that carbon dioxide gas supplied into the hollow space of the rotating shaft 43 is supplied into the screw mixer device 40 through the gas nozzle hole. .
8. The method of claim 7,
Wherein moisture is further sprayed into the interior of the screw mixer device (40) through a gas nozzle hole formed in the rotary shaft (43) by further supplying water into the hollow interior of the rotary shaft (43) .

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