JP5283574B2 - Dismantling concrete fine grain processing method and processing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for treating fine grains of demolished concrete, in which a continuous treatment is performed and heating energy is not needed. <P>SOLUTION: Fine grains 14 of demolished concrete are continuously charged into a mill pot 40 from a fine grain feeding part 12, and air W1 for circulation is sent to the mill pot 40 by a blower device 58. The mill pot 40 rotates around its own axis while revolving around the revolution axis 42 of a planetary mill 36, and thereby, the charged fine grains 14 of the demolished concrete are pressed to the inner wall of the mill pot 40 by centrifugal force F, and are ground and kneaded. A fine powder 34 of a cement hardened material, separated by grinding and kneading, is removed together with air W1 and recovered by a fine powder recovery device 60. Fine aggregate 32 from which the fine powder 34 is removed is extruded from a taking-out port 50 and recovered in a fine aggregate recovery part 52. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a processing method and a processing apparatus for demolition concrete fine particles.

  The demolished concrete block generated by the dismantling of the concrete structure is crushed and reused. Today, coarse aggregates (5 mm or more) are widely recycled due to advances in recycling technology (Patent Document 1).

The method described in Patent Document 1 is a method for reclaiming coarse aggregate with a large-sized apparatus because of slow drum rotation and poor efficiency, and cannot be applied to dismantled concrete fine particles having a particle size of 5 mm or less.
Thus, since the dismantling concrete fine grain has not developed the processing technology, the recycling is not progressing.

This is because the crushed disassembled concrete fine particles have cement hardened bodies (fine powder) attached to the surface of the fine aggregate that is the main component of the dismantled concrete fine particles, and the strength of the adhering cement hardened bodies However, it is lower than the strength of the fine aggregate itself and has a large water absorption rate. Therefore, when it is used while adhering, the strength of the concrete decreases and the drying shrinkage rate increases.
Furthermore, there is also a problem that fluidity becomes unstable due to the cemented hardened body adhered.

For this reason, in order to recycle the dismantled concrete fine particles, it is necessary to separate the dismantled concrete fine particles into fine aggregates and hardened cement bodies and to remove the hardened cement bodies from the surface of the fine aggregates.
As a method of reclaiming demolition concrete fine particles, a method of removing a hardened cement from fine aggregate using two types of stirring devices has been proposed (Patent Document 2).

  That is, according to the method described in Patent Document 2, the demolition concrete block is crushed and then heated to screen the demolition concrete fine particles in the process of collecting the recycled coarse aggregate, and the demolition concrete fine particles are taken out. Next, the dismantled concrete fine particles are agitated in the first agitator to wear the surface (dry agitation process). Thereafter, the surface is further abraded by further stirring in the second stirring device (wet stirring step). As a result, the hardened cement (paste) attached to the surface of the fine aggregate is removed.

  However, in the method of Patent Document 2, it is necessary to heat after crushing the demolished concrete lump, which requires heating energy. For this reason, it is not practical in terms of the regeneration cost of fine aggregates and the burden on the environment. In addition, two types of stirring devices, the first stirring device and the second stirring device, are required, and a large installation space for the stirring device is required, and the time required for the stirring process becomes long.

  As shown in FIG. 18, in the method described in Patent Document 3, a high-speed rotating drum 82 is rotatably provided inside a frame 86, and the high-speed rotating drum 82 is rotated at high speed via a chain 92 by the power of a motor 90. Let On the side surface of the high-speed rotating drum 82, there is provided an input port 88 through which the demolition concrete lump 80 is charged, and a crushing roller 84 for crushing the demolition concrete lump 80 is provided inside.

  As a result, the demolished concrete lump 80 is brought into close contact with the inner wall of the high-speed rotating drum 82 by centrifugal force and rotates together. The demolished concrete block 80 in close contact with the inner wall is crushed by applying pressure adjusted by the crushing roller 84. At this time, the demolished concrete blocks 80 are rubbed between the inner wall of the high-speed rotating drum 82 and the crushing roller 84. However, in this method, the aggregate is easily crushed by the crushing roller, and maintenance is necessary because the roller is worn. Furthermore, since it is a batch process, continuous processing cannot be performed, and the time required for the process is long and time-consuming.

JP 2000-197876 A Japanese Patent Laid-Open No. 08-091893 JP 2006-218339 A

  An object of this invention is to provide the processing apparatus and processing method of a demolition concrete fine grain which can be continuously processed and does not require a heating energy in view of the said fact.

  The method for processing demolition concrete fine particles according to the invention of claim 1 is attached to a mill main body of a planetary mill, sends gas to a mill pot that rotates while revolving around the axis of the mill main body, and inside the mill pot, The disassembled concrete fine particles with cement hardened body adhering to the surface of the fine aggregate are rubbed together to separate the fine aggregate and the cement hardened body.

As a result, the disassembled concrete fine particles are rubbed together inside the mill pot, and the fine aggregate and the hardened cement adhered to the surface of the fine aggregate are separated. And the separated cement hardening body is removed from a mill pot with the gas sent to the mill pot.
Thereby, reattachment of a hardened cement body and a fine aggregate can be prevented, and separation of a fine aggregate and a hardened cement body can be performed continuously without requiring heating energy.

  Invention of Claim 2 is the processing method of the dismantled concrete fine grain of Claim 1, The rotation direction of the said mill pot is made into the same direction as the revolution direction of the said mill pot, Gravitational acceleration G1 of rotation, The ratio GR (GR = G1 / G2) of the gravitational acceleration G2 is set to 0.01 or more.

  According to the invention described in claim 2, the rotation direction of the mill pot is the same direction as the revolution direction of the mill pot. By making the revolution and rotation of the mill pot in the same direction, demolition concrete fine particles fly inside the mill pot and the flying demolition concrete fine particles are prevented from colliding with each other. Thereby, the cement hardened body adhering to the surface of the fine aggregate and the fine aggregate can be separated without destroying the fine aggregate.

  Further, the ratio GR (GR = G1 / G2) of the gravity acceleration G1 of rotation of the mill pot and the gravity acceleration G2 of revolution is 0.01 or more. Thereby, it can prevent that the demolition concrete fine particles set to one, and demolition concrete fine particles are made into a mutually separated state. Thereby, the separated fine powder easily floats in the mill pot, and the removal of the fine powder is promoted. At the same time, the grind between the dismantled concrete particles is promoted.

The invention according to claim 3 is the processing method of the dismantled concrete fine particles according to claim 1 or 2, in addition to the dismantled concrete fine particles inside the mill pot by centrifugal force generated in the mill pot rotating while revolving. The gravitational acceleration is 50G or more.
According to the invention described in claim 3, gravitational acceleration of 50G or more is applied to the demolition concrete fine particles. The grinding effect is promoted by grinding the dismantled concrete fine particles with each other under a gravitational acceleration of an appropriate size. As a result, the hardened cement adhering to the surface of the fine aggregate is separated in a short time.
In addition, if it is 50G or less, the grind action between concrete fine particles is insufficient.

  According to the fourth aspect of the present invention, there is provided a method for treating demolition concrete fine particles. The demolition concrete fine particles recovered from the demolition concrete lump and having hardened cement adhered to the surface of the fine aggregate are attached to the mill body of the planetary mill. A separation step of separating the fine aggregate and the hardened cement body from the inside of the mill pot, and being provided outside the planetary mill. The gas is sent from the blower of the fine powder removing means to the mill pot, the separated fine powder of the hardened cement body is removed from the mill pot, and the removed fine powder is collected by the fine powder collecting device provided in the fine powder removing means Fine powder removing / recovering step, and the fine aggregate from which the hardened cement body has been removed is collected by a fine aggregate collecting unit provided below the mill pot. It is characterized by having a wood recovery step.

According to the fourth aspect of the present invention, the demolished concrete fine particles are processed in the following procedure. That is, first, in the separation step, the dismantled concrete fine particles put into the mill pot that rotates while revolving are separated into fine aggregate and cement hardened body. Next, in the fine powder removal / recovery process, gas is sent to the mill pot, the fine powder of the hardened cement body is removed from the mill pot, and the removed fine powder is collected by the fine powder collection device. And the fine aggregate from which the cement hardening body was removed is collect | recovered by the fine aggregate collection | recovery part provided below the mill pot at the fine aggregate collection process.
As a result, the dismantled concrete fine particles introduced can be separated into fine aggregate and fine powder, and each can be recovered.

Invention of Claim 5 is a processing method of the demolition concrete fine grain of Claim 4, The said demolition concrete fine grain is the said isolation | separation process, the said fine powder removal and collection process, and the said fine aggregate collection process. It is characterized by continuous processing in order.
Thus, by processing each process continuously, it becomes possible to increase the processing capacity of the demolition concrete fine particles, and it is possible to meet the demand for mass processing.

  The dismantling concrete fine grain processing apparatus according to the invention of claim 6 is provided with a fine grain supplying unit which is supplied from demolition concrete lump which is recovered from the demolishing concrete lump and has cement hardened body adhering to the surface of the fine aggregate. The mill main body revolving around the rotation axis, and the dismantled concrete fine particles stored in the mill main body and introduced from the fine particle supply unit through the input port are rotated while revolving, and the fine aggregate and the A planetary mill provided with a mill pot to be separated into a hardened cement body, and a fine powder removing device that is provided outside the planetary mill, sends gas from the charging port to the mill pot, and removes the fine powder of the hardened cement body from the mill pot Means, and a fine aggregate recovery part that is provided below the outlet of the mill pot and recovers the fine aggregate from which the hardened cement body has been removed. That.

  According to the sixth aspect of the present invention, the demolition concrete fine particles produced by pulverizing the concrete block are supplied to the fine particle supply unit. The demolished concrete fine particles supplied to the fine particle supply unit are charged into a mill pot accommodated in the mill main body through a charging port. The mill pot rotates while revolving around the rotation axis of the planetary mill, and the dismantled concrete fine particles are separated into fine aggregates and hardened cement fine powder inside the mill pot.

Dismantled concrete fine particles thrown in from the top of the mill pot are also seen in a state of being pressed against the peripheral wall of the mill pot by centrifugal force. And it is gradually pushed down from the upper part of a mill pot by the demolition concrete fine grain thrown into the upper part of a mill pot later. At this time, the hardened cement body is gradually separated from the surface of the fine aggregate by being pushed down while being rubbed.
Finally, when reaching the outlet at the lower end of the mill pot, the hardened cement body is removed and the regenerated fine aggregate is obtained. The regenerated fine aggregate is collected by a fine aggregate collection unit provided below the outlet of the mill pot.

  Further, fine powder removing means provided outside the planetary mill sends gas from the inlet to the mill pot, and removes fine powder separated from the fine aggregate and floating on the gas from the mill pot. At this time, since the fine powder has a smaller mass and smaller particle diameter than the fine aggregate, only the fine powder can be removed by controlling the wind speed.

Thereby, it can prevent that the fine powder isolate | separated and floated inside the mill pot acts as a buffering material, and becomes an obstacle at the time of isolate | separating a cement hardening body from the surface of a fine aggregate. Further, the separated fine powder can be prevented from reattaching to the fine aggregate.
As a result, the dismantled concrete fine particles can be continuously separated into fine aggregate and fine powder inside the mill pot that rotates while revolving. Thereby, the continuous processing of demolition concrete fine grain is attained.

  A seventh aspect of the present invention is the dismantled concrete fine particle processing apparatus according to the sixth aspect, wherein the fine powder removing means includes a flow passage connecting the input port and the fine aggregate recovery section, and the flow passage. A blower that circulates gas between the charging port, the mill pot, the fine aggregate recovery unit, and the flow path, and the fine powder discharged from the mill pot together with the gas. It is characterized by having a fine powder collecting device that captures and collects in a path, and a water removing device that removes water in the gas.

  According to invention of Claim 7, the fine powder removal means has connected the inlet and the fine aggregate collection | recovery part by the flow path. An air blower is provided in the flow passage, and gas is sent from the inlet to the mill pot, and fine particles separated and floated inside the mill pot are discharged together with the gas. The fine powder discharged from the mill pot is sucked into the flow passage from the fine aggregate recovery unit.

  The fine powder sucked into the flow passage is captured and collected by a fine powder collecting device provided in the flow passage. The gas from which the fine powder has been removed passes through the moisture removing device and returns to the blower. At this time, the moisture removing device is provided with moisture removing means such as a dehumidifying device using a cooling coil and a hygroscopic agent, and removes moisture in the gas.

  As a result, the fine powder generated inside the mill pot and the water generated when the hardened cement body is separated from the fine aggregate can be removed, and the fine powder separated inside the mill pot acts as a buffer material. This prevents obstacles when separating the fine aggregate and cement hardened body and reattachment of fine powder to the fine aggregate. As a result, the grime effect inside the mill pot can be continuously performed.

  The invention according to claim 8 is the disassembling concrete fine particle processing apparatus according to claim 6 or 7, wherein the mill pot is rubbed by grinding the fine particles with centrifugal force generated by rotation while revolving. It is characterized by generating a fir tree effect.

  According to the eighth aspect of the present invention, the mill pot can generate a large centrifugal force because it rotates while revolving. This large centrifugal force is used for the effect of smashing fine particles. As a result, the fine aggregate can be regenerated without crushing, and the regeneration efficiency of the fine aggregate can be increased.

The invention according to claim 9 is the dismantling concrete fine particle processing apparatus according to any one of claims 6 to 8, wherein the fine powder collecting device includes a bag filter for capturing the fine powder, and a bag filter. And a fine powder collection unit that collects the fine powder captured at a lower portion.
According to invention of Claim 9, the fine powder capture | acquired with the bag filter is collect | recovered by the fine powder collection | recovery part. As a result, the fine powder can be collected and recycled.

A tenth aspect of the present invention is the dismantling concrete fine particle processing apparatus according to any one of the sixth to ninth aspects, wherein the fine powder removing means for circulating the gas, the charging port, the mill pot, and the It is characterized in that the fine aggregate recovery part is sealed.
Thereby, when air is circulated as a gas, carbon dioxide in the sealed air can be removed early with calcium hydroxide in the fine powder, and after removal, air with less carbon dioxide can be circulated. By circulating air with a small amount of carbon dioxide, the fine powder made alkaline by the cement can be recovered while maintaining the alkalinity without being neutralized.

The eleventh aspect of the present invention is the dismantling concrete fine grain processing apparatus according to the tenth aspect, wherein the circulating gas is nitrogen gas.
By circulating nitrogen gas and removing fine powder from the mill pot, reaction with calcium hydroxide in the fine powder is prevented. Thereby, the fine powder made alkaline by the cement can be recovered while maintaining the alkalinity without being neutralized.

  The invention according to a twelfth aspect is the dismantling concrete fine grain processing apparatus according to any one of the sixth to eleventh aspects, wherein the mill pot is rubbed together with the demolition concrete fine grain so as to be finely crushed. A coarse aggregate for concrete that separates the aggregate and the fine powder, or an iron ball is mixed.

According to the twelfth aspect of the invention, the concrete coarse aggregate or iron ball mixed in the mill pot is rubbed with the dismantled concrete fine particles to promote separation of the fine aggregate and the cement hardened body. Thereby, a fine aggregate and a cement hardening body can be isolate | separated in a short time.
When the coarse aggregate for concrete is used, it can be used as it is as a coarse aggregate after regeneration.

  Since the present invention has the above-described configuration, it is possible to provide a demolition concrete fine grain processing method and a demolition concrete fine grain processing apparatus that can be continuously processed and do not require heating energy.

It is a figure which shows the basic composition of the mill pot used for the processing method of the demolition concrete fine grain which concerns on the 1st Embodiment of this invention. It is the figure which showed the demolition concrete fine grain notionally. It is a figure which shows the basic composition of the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the manufacture procedure of demolition concrete fine grain. It is a figure which shows the direction of the centrifugal force which arises in the mill pot in the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention. It is a figure explaining the surging action which generate | occur | produces in the mill pot in the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention. It is a figure which shows the result of the verification experiment in the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention. It is a figure which shows the relationship between the rotation direction of the verification experiment in the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention, and the collection | recovery rate of a reproduction | regeneration fine aggregate. It is a figure which shows the relationship between the self-revolution ratio of the verification experiment in the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention, and the water absorption rate of a reproduction | regeneration fine aggregate. It is a figure which shows the result of the gravity acceleration of the verification experiment in the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention, and the water absorption rate of a reproduction | regeneration fine aggregate. It is a figure which shows the external appearance of the demolition concrete fine grain used in the verification experiment in the processing apparatus of the demolition concrete fine grain which concerns on the 2nd Embodiment of this invention. It is a figure which shows the basic composition of the processing apparatus of the demolition concrete fine grain which concerns on the 3rd Embodiment of this invention. It is a figure which shows the fine powder removal condition in the mill pot in the processing apparatus of the demolition concrete fine grain which concerns on the 4th Embodiment of this invention. It is a figure which shows the speed-up gear which speeds up the mill pot in the processing apparatus of the demolition concrete fine grain which concerns on the 5th Embodiment of this invention. It is a figure which shows the grinding action in the mill pot in the processing apparatus of the demolition concrete fine grain which concerns on the 6th Embodiment of this invention. It is a figure which shows the grinding action in the mill pot in the processing apparatus of the demolition concrete fine grain which concerns on the 7th Embodiment of this invention. It is a flowchart which shows the processing method of the demolition concrete fine grain which concerns on the 8th Embodiment of this invention. It is a figure which shows the basic composition of the coarse aggregate reproduction | regeneration apparatus of a prior art example.

(First embodiment)
As shown in FIG. 1, the demolition concrete fine grain processing method 8 according to the first embodiment is processed by a mill pot 40 that rotates while revolving.
The mill pot 40 is formed in a cylindrical shape, is attached to a mill main body of a planetary mill described later, and rotates around a rotation axis J2 in the direction of an arrow R2 while revolving around a rotation axis J1 (not shown).
In the upper part of the mill pot 40, an inlet 43 for dismantling concrete fine particles 14 described later is opened, and in the lower part, an outlet 50 for dismantling concrete fine particles 14 is opened.

The dismantled concrete fine particles 14 are introduced into the mill pot 40, and the gas W <b> 1 is sent from the inlet 43 of the mill pot 40 toward the outlet 50.
As the mill pot 40 rotates while revolving, centrifugal force F acts on the demolished concrete fine particles 14. Then, it receives centrifugal force F and rotates together with the mill pot 40 while being pressed against the peripheral wall of the mill pot 40. Thereby, the demolition concrete fine particles 14 are also seen.

  As shown in FIG. 2, the demolition concrete fine particles 14 put into the mill pot 40 are fine particles generated by crushing the demolition concrete lump, and a cement hardened body (fine powder) 34 is formed on the surface of the fine aggregate 32. It is in an attached state. For this reason, in order to reuse the fine aggregate 32 and the fine powder 34, it is necessary to separate the fine aggregate 32 and the fine powder 34.

  In order to separate the fine powder 34 from the surface of the fine aggregate 32, it is effective to grind the demolition concrete fine particles 14 inside the mill pot 40 and separate them by the grind action. The separated hard cement fine powder 34 is separated and floated, and the gas W <b> 1 is sent to the inside of the mill pot 40, removed outside the mill pot 40, and collected. Thereby, the regenerated fine aggregate 32 and the fine powder 34 that are left inside the mill pot 40 and from which the hardened cement body has been removed can be recovered.

In order to effectively perform the grime action inside the mill pot 40, the rotational direction R2 of the mill pot 40, the gravitational acceleration G acting on the demolition concrete fine particles 14 inside the mill pot 40, the gravitational acceleration G1 of the rotation of the mill pot 40, and The self-revolution ratio GR, which is the ratio (G1 / G2) of the gravity acceleration of the revolution gravity acceleration G2, is important.
That is, as shown in FIG. 1 (C), when the rotation direction, the gravitational acceleration G, and the rotation / revolution ratio GR are appropriate, the dismantled concrete fine particles 14 are separated to such a degree that they partially contact each other. . As a result, the disassembled concrete fine particles 14 are ground inside the mill pot 40, and the hardened cement body is separated from the surface of the fine aggregate.

  On the other hand, as shown in FIG. 1B, even when the gravitational acceleration G2 due to revolution is sufficient, if the revolution ratio GR is too small, the dismantled concrete fine particles 14 remain pressed against the peripheral wall of the mill pot 40. Rotate while revolving as a whole. For this reason, the grind of the dismantled concrete fine particles 14 is hardly performed.

  As described above, gas is sent to the mill pot 40 that rotates while revolving, and the dismantled concrete fine particles 14 are rubbed together inside the mill pot 40, so that the dismantled concrete fine particles 14 are combined with the fine aggregate 32 and the fine bones. It can be separated into fine cemented powder 34 adhering to the surface of the material 32.

(Second Embodiment)
As shown in FIG. 3, the demolition concrete fine grain processing apparatus 10 according to the second embodiment continuously supplies the demolition concrete fine grain 14 generated by pulverizing the concrete block to the planetary mill 36 at the upper part. It has the fine grain supply part 12 to do.

  The fine grain supply unit 12 is provided at a lower part of the fine grain supply port 16 and the fine grain supply port 16 into which the demolished concrete fine grain 14 is charged. A conveyance path 20 that conveys to the insertion port 18 of the planetary mill 36 is provided. Inside the conveyance path 20, blades are attached in a spiral shape to the center axis, and the blades move while rotating by the rotation of the center axis, and the spiral that continuously conveys the demolition concrete fine particles 14 to the fine particle inlet 18. A blade 100 is provided. A motor 102 that rotates the spiral blade 100 is provided at one end of the conveyance path 20.

  As shown in FIG. 4, the dismantled concrete fine particles 14 include a crushing process 24 for crushing and crushing the concrete lump 22 with, for example, an eccentric rotor-type recycled coarse aggregate manufacturing apparatus, and the crushed concrete lump 22. It isolate | separates with a vibration sieve, It produces | generates through the separation process 26 which collect | recovers the diameter 5mm or less as the demolition concrete fine grain 14. At this time, the recycled coarse aggregate 28 having a diameter of 5 mm or more is also collected at the same time as the demolition concrete fine particles 14. The demolition concrete fine particles 14 are processed by a planetary mill 36 provided below the fine particle supply unit 12.

  The planetary mill 36 has a mill body 38 that rotates around a revolution shaft 42. The revolution shaft 42 is provided vertically at the center of the planetary mill 36, and a revolution arm 39 is fixed to the upper portion of the revolution shaft 42. A plurality of mill pots 40 described in the first embodiment are attached to the revolution arm 39 with the rotation axis being vertical, and rotate around the revolution axis 42 together with the revolution arm 39.

  The mill pot 40 is rotatably attached to the revolving arm 39 via a ball bearing 41 provided on the outer peripheral surface. Thereby, the mill pot 40 can rotate around the central axis while revolving.

  A revolution bearing base 44 that pivotally supports the revolution shaft 42 is provided below the revolution shaft 42, and a pulley 46 is provided at the lower end portion of the revolution shaft 42 protruding downward from the revolution bearing base 44. Power from an electric motor (not shown) is transmitted to the pulley 46 to rotate the revolution shaft 42.

At the upper part of the revolving shaft 42, the charging port 18 is provided to open upward, and the demolished concrete fine particles 14 conveyed by the spiral blade 100 are continuously charged from the charging port 18.
A branch pipe 48 that diverges radially around the inlet 18 is provided at the lower part of the inlet 18, and the tip of the branch pipe 48 is inserted into a branch pipe insertion opening 43 provided at the upper part of the mill pot 40. Yes.

The input port 18 and the branch pipe 48 rotate integrally with the revolution shaft 42, and the fine particles 14 input to the input port 18 are conveyed in the radial direction by centrifugal force, and the upper part inside each mill pot 40. It is thrown into.
An elastic band 49 is provided between the attachment position of the revolution arm 39 and the attachment position of the revolution bearing base 44 on the revolution shaft 42.

  The elastic band 49 is formed of a pneumatic tire capable of adjusting the internal pressure. The elastic band 49 is separated from the revolution shaft 42 and surrounds the revolution shaft 42, and the elastic band 49 does not rotate even when the revolution shaft 42 rotates. The outer peripheral surface of the elastic band 49 is crimped to the outer peripheral surface 40F of the mill pot 40.

  Thereby, when the mill pot 40 revolves due to the rotation of the revolution shaft 42, the outer peripheral surface 40F receives a restraining action by the elastic band 49, so that the revolution is limited at the position of the outer peripheral surface 40F. As a result, the mill pot 40 generates a rotational force around the central axis of the mill pot 40 itself. Due to this rotational force, the mill pot 40 rotates while revolving.

  That is, as shown in FIG. 5, for example, when the mill body 38 is revolving in the direction of the arrow R1, the mill pot 40 revolves in the direction of the arrow R2 while revolving in the direction of the arrow R1 together with the mill body 38. To do. At this time, a large centrifugal force F is generated in the radial direction of the revolution shaft 42 inside the mill pot 40. As a result, as described in the first embodiment, the fine particles 14 put into the mill pot 40 are collected in the radial direction of the revolution shaft 42 by the centrifugal force F, and the dismantled concrete fine particles 14 are centrifuged. They are rubbed together under the force F.

  In addition, from the structure of the planetary mill 36, it is possible to rotate the rotation direction in a method different from the revolution direction. However, when the direction of rotation and the direction of revolution are different, the dismantled concrete fine particles 14 thrown into the mill pot 40 start flying inside the mill pot 40.

  As a result, they collide with each other while flying, and the collision becomes more remarkable than the grinding action, and the demolished concrete fine particles 14 are crushed without being ground, and the recovered amount of the fine aggregate 32 is reduced.

  On the other hand, when the rotation direction and the revolution direction are set to the same direction, since the relative speed with the inner wall surface of the mill pot 40 is small, the dismantled concrete fine particles 14 rotate in the same direction, and the dismantled concrete fine particles 14 are While pressing with centrifugal force, grinding is promoted and fine powder is separated from the surface of the fine aggregate 32.

  An outlet 50 for the regenerated fine aggregate 32 is provided on the bottom surface of the mill pot 40, and a fine aggregate recovery unit 52 for recovering the fine aggregate 32 is provided below the outlet 50. Further, a recovery conveyor 54 for the fine aggregate 32 is provided below the fine aggregate recovery unit 52, and the regenerated fine aggregate 32 is transported to the shipping place.

  An air circulation duct 56 is provided outside the planetary mill 36. One end of the duct 56 is connected to the fine grain supply unit 12, and the other end is connected to the fine aggregate recovery unit 52. The duct 56 is provided with a blower 58 that circulates air in the order of the inlet 18, the mill pot 40, the fine aggregate recovery unit 52, and the duct 56.

The duct 56 is provided with a fine powder collecting device 60 that captures and collects the fine powder 34 and a moisture removing device 62 that removes moisture in the air.
As a result, the gas W1 is sent from the blower 58 to the mill pot 40 through the inlet 18, and the fine powder 34 is discharged from the mill pot 40 to the duct 56 together with the air W1 that has passed through the mill pot 40.

Then, the fine powder 34 separated from the fine aggregate 32 is captured by the bag filter 61 of the fine powder collecting device 60 provided in the duct 56, and mechanical vibration is applied to the bag filter 61 to collect the fine powder 34 collected. It is dropped on the part 63 and collected. A cyclone type fine dust collecting mechanism may be provided on the upstream side of the bag filter 61. Further, water generated when the fine aggregate 32 and the fine powder 34 are separated is removed by the water removing device 62.
Thereby, the reattachment of the fine powder 34 and the fine aggregate 32 can be prevented, and the new fine powder 34 is separated from the surface of the fine aggregate 32 by the grinding action.

Next, the circulating air amount will be described.
When the dismantled concrete fine particles 14 are continuously processed by a planetary mill, moisture is generated. If this moisture is not removed from the mill pot 40, the fine powder containing moisture will reattach to the surface of the fine aggregate, preventing the progress of grinding. Moreover, the fine powder containing moisture adheres to the peripheral wall of the mill pot 40, the peripheral wall that becomes the grinding chamber of the mill pot 40 is closed, and the processing capacity is reduced.

For this reason, it is necessary to send an appropriate amount of air to remove moisture from the mill pot 40. Here, the moisture content of the dismantled concrete granules to be introduced is about 6%, and it is clear from experimental results that continuous treatment is possible if the moisture content can be maintained at about 4%.
The amount of air required to reduce the moisture content of demolition concrete from 6% to 4% by circulating air is 10 tons / hour for the planetary mill, 208 kg of dry moisture, and the inlet air temperature of the mill pot 40. Under the conditions of 20 ° C., humidity 50%, outlet air temperature 40 ° C., and humidity 90%, it becomes 5859 kg / hour (77 m ³ / min).

Next, the grime action will be described.
As shown in FIG. 6, the dismantled concrete fine particles 14 put into the mill pot 40 are separated into fine aggregate 32 and fine powder 34 in the following process by the grinding action between the dismantled concrete fine particles 14.

  When the demolished concrete fine particles 14 are put into the mill pot 40 that rotates while revolving, the demolished concrete fine particles 14 are collected in the radial direction of the mill pot 40 by the centrifugal force F. At this time, since the centrifugal force F received by the demolished concrete fine particles 14 is large, it is located at the upper part of the mill pot 40 without falling due to its own weight, and is ground between the deconstructed concrete fine particles 14, and the fine powder 34 is gradually separated. . (FIG. 6 (A)). Centrifugal force F acts

  The hardened cement 34 is gradually separated from the surface of the fine aggregate 32 by rubbing the fine particles 14 in a state where the centrifugal force F is received. Moreover, since the new demolition concrete fine grain 14 is thrown into the upper part of the mill pot 40 continuously, it is pushed down gradually by the newly thrown demolition concrete fine grain 14.

  At this time, since the separated fine powder 34 is light, it floats inside the mill pot 40. By adjusting the speed of the air W1, it is possible to remove only the fine powder 34 from the inside of the mill pot 40 with the air W1 using the difference in mass of the separated fine powder 34. As a result, the separated fine powder 34 acts as a buffer material and does not hinder the separation of the fine powder 34 from the surface of the fine aggregate 32. Further, the separated fine powder 34 can be prevented from reattaching to the fine aggregate 32 (FIG. 6B).

While the inside of the mill pot 40 is pushed downward, the dismantled concrete fine particles 14 are continuously rubbed together (FIG. 6C).
The disintegration concrete fine particles 14 are continuously bonded to each other, and the hardened cement body is removed from the surface of the fine aggregate 32 (FIG. 6D).

Finally, the recycled fine aggregate 32 from which the hardened cement body has been removed from the surface is pushed down and falls from the outlet 50 of the mill pot 40. The dropped fine aggregate 32 is collected at the lower portion of the take-out port 50 (FIG. 6E).
The fine powder 34 is collected by the fine powder collection device 60 provided in the duct 56 as described above.

  Thereby, the fine powder 34 generated inside the mill pot 40 can be removed, and the water generated when the fine powder 34 is separated from the fine aggregate 32 can be removed, and the grinding action inside the mill pot 40 is continuously performed. Can do.

As a result, the dismantled concrete fine particles 14 can be continuously separated into the fine aggregate 32 and the fine powder 34 inside the mill pot that rotates while revolving without requiring heating energy.
Moreover, since the demolition concrete fine particles 14 are grinded together, the fine aggregate 32 can be regenerated without crushing, and the regeneration efficiency of the fine aggregate 32 can be increased.

Next, the result of the verification experiment will be described.
What was used for the experiment was a planetary mill 36 equipped with two mill pots 40 having a diameter of 100 mm and a height of 380 mm and capable of continuous processing, and the processing speed of the demolition concrete fine particles 14 was 10 kg / hour.
The demolished concrete fine particles 14 are fine particles generated from a demolished concrete lump obtained by demolishing a 43-year-old building.
The collected fine aggregate 32 and fine powder 34 were classified as recycled fine aggregate 32 having a diameter of 0.6 mm or more and recycled fine powder 34 having a diameter of less than 0.6 mm.

FIG. 7 shows experimental conditions and measurement results.
The experiment was performed for eight conditions (Experiment 1 to Experiment 8) in which the conditions of the revolution direction, the revolution ratio GR, and the gravitational acceleration G were changed. The direction of rotation / revolution indicates the direction of rotation and revolution of the mill pot 40, and the gravity acceleration G indicates a value obtained by summing the gravity acceleration G1 during rotation and the gravity acceleration G2 during rotation.
The results were organized by the recovery rate (%) of the regenerated fine aggregate 32 and the water absorption rate (%) of the regenerated fine aggregate 32. The resorption rate of the regenerated fine aggregate 32 was measured according to the “fine aggregate density and water absorption test (JIS A1109)”.

FIG. 8 shows the relationship between the direction of revolution and the recovery rate of recycled fine aggregate.
Characteristic A indicates a characteristic in which the direction of rotation and revolution is the same, and characteristic B indicates a characteristic in which the direction of rotation and revolution is opposite. Compared to the same direction of revolution (Experiment 1), the recovery rate of recycled fine aggregate was lower when the direction of revolution was opposite (Experiment 5).
As described above, this is considered to be because, when the direction of rotation and rotation is the reverse direction, the demolition concrete fine particles 14 started to fly inside the mill pot 40, and the demolition concrete fine particles 14 collided with each other and were pulverized. .
On the other hand, when the self-revolving direction is the same direction, it is considered that the surging action is promoted, only the hardened cement body 34 on the surface is crushed, and the fine aggregate 32 is less crushed. From the above, it can be said that the same direction is desirable as the rotation direction.

FIG. 9 shows the relationship between the revolution ratio and the water absorption rate of the recycled fine aggregate.
A characteristic C indicates a characteristic at a rotation / revolution ratio of 0.006, a characteristic D indicates a characteristic at a ratio of 0.010, and a characteristic E indicates a characteristic at a rotation / revolution ratio of 0.027. The water absorption rate of the regenerated fine aggregate is increased as the rotation ratio is increased to 0.006 (Experiment 6), 0.010 (Experiment 2), and 0.027 (Experiment 1). %) Showed a tendency to decrease.
The lower the water absorption rate (%) of the regenerated fine aggregate 32, the more the cement hardened body 34 has been removed from the surface of the regenerated fine aggregate 32. 0.010 or more).

FIG. 10 shows the relationship between the gravitational acceleration and the water absorption rate of the recycled fine aggregate.
A characteristic F indicates a characteristic when the gravitational acceleration is 20 G, a characteristic G indicates a characteristic when the gravitational acceleration is 35 G, a characteristic H indicates a characteristic when the gravitational acceleration is 50 G, a characteristic I indicates a characteristic when the gravitational acceleration is 125 G, and a characteristic J Indicates a characteristic at a gravitational acceleration of 200G.

From the results, it was shown that the water absorption rate (%) of the regenerated fine aggregate decreased as the gravity acceleration G increased.
In particular, the water absorption was greatly reduced between the characteristic G and the characteristic H, that is, between the gravitational acceleration 35G and 50G. It shows that the cement hardened body 34 has been removed from the surface of the regenerated fine aggregate 32 when the gravitational acceleration is 50 G or more.
From the above, it can be said that it is desirable to use a gravitational acceleration of 50G or more.

In FIG. 11, the photograph of the demolition concrete fine grain 14 thrown in for the test and the regenerated fine aggregate 32 is shown.
FIG. 11 (A) shows the dismantled concrete fine particles 14 before processing, and the surface of the fine aggregate 32 is covered with a hardened cement body 34.
FIG. 11B shows the fine aggregate 32 processed under the condition where the revolution ratio is small (GR = 0.006, Experiment 6). Many hardened cement bodies 34 remain on the surface of the fine aggregate 32, and it can be said that regeneration is insufficient.
FIG. 11C shows the fine aggregate 32 after processing the revolution ratio with an appropriate value (GR = 0.027, Experiment 1). The hardened cement body 34 is removed.

(Third embodiment)
As shown in FIG. 12, the demolition concrete fine grain processing device 64 according to the third embodiment seals the circulation path of the air W1 in the demolition concrete fine grain processing device 10 according to the second embodiment. It has a structure.
Specifically, the fine particle supply unit 12 into which the demolition concrete fine particles 14 are charged is provided with a sealing material (not shown) between the blade tip of the spiral blade 112 and the inner wall of the conveyance path to ensure airtightness. The dismantled concrete fine particles 14 can be continuously fed.
Further, a seal 114 is provided at a joint portion between the charging portion of the fine particle supply unit 12 and the charging port 18. A slide member (not shown) is embedded in the seal 114, and the inlet 18 is sealed in a state in which the rotation of the branch pipe 48 is ensured.

Further, a seal member 116 is provided between the branch pipe insertion port 43 at the top of the mill pot 40 and the distal end portion of the branch pipe 48. Similarly, a seal member 118 is provided between the outlet 50 at the bottom of the mill pot 40 and the fine aggregate recovery unit 52.
A slide member (not shown) is embedded in the seal member 118, and the airtightness of the joint portion is secured in a state where the mill pot 40 rotates while revolving.

Further, a first shielding plate 120 and a second shielding plate 122 are provided in the collection port 53 of the fine aggregate collection unit 52. Further, a lower seal member 124 is provided below the first shielding plate 120 and the second shielding plate 122, and an upper sealing member 126 is provided above the first shielding plate 120 and the second shielding plate 122. Yes.
As a result, the recovery port 53 is doubled in a sealed state. The regenerated fine aggregate 32 is collected while the first shielding plate 120 and the second shielding plate 122 are sequentially opened, and airtightness at the collection port 53 is secured.

  Then, air can be circulated through the sealed circulation path. Thereby, the carbon dioxide gas in the sealed air is removed by the calcium hydroxide in the fine powder at the beginning of the operation. And after carbon dioxide gas is removed, air with little carbon dioxide gas will circulate. By circulating air with a small amount of carbon dioxide, the fine powder made alkaline by the cement can be recovered while maintaining the alkalinity without being neutralized.

(Fourth embodiment)
As shown in FIG. 13, the demolition concrete fine grain processing device 65 according to the fourth embodiment is configured such that the air W1 in the demolition concrete fine grain processing device 64 according to the third embodiment is replaced with nitrogen gas W2. It is a thing.

  That is, the nitrogen gas W <b> 2 is sent from the air blower 58 provided in the duct 56 to the mill pot 40 through the charging port 18. The nitrogen gas W2 takes away the fine powder 34 when passing through the mill pot 40 and is sucked into the duct 56 together with the fine powder 34 by the fine aggregate collecting unit 52.

Then, the fine powder 34 in the nitrogen gas W <b> 2 is captured by the fine powder collecting device 60 provided in the duct 56 and collected by the fine powder collecting unit 63. Thereafter, the moisture in the nitrogen gas W2 is removed by the moisture removing device 62.
As described above, by using the nitrogen gas W2, the fine powder made alkaline by the cement can be recovered while maintaining the alkalinity without being neutralized.
Other configurations are the same as those of the third embodiment, and a description thereof will be omitted.

(Fifth embodiment)
As shown in FIG. 14, the dismantled concrete fine grain processing device 66 according to the fifth embodiment uses the mill pot 40 in the dismantled concrete fine grain processing device 10 according to the second embodiment as a speed increasing gear 110. It is the structure which speeds up.
That is, the speed increasing gear 110 is provided outside the revolution shaft 42 with the same axis as the revolution shaft 42, and the outer periphery of the speed increasing gear 110 and the outer periphery of the two mill pots 40 are joined together. 40 is configured to rotate.

By rotating the speed increasing gear 110 independently in the direction R3 opposite to the revolution direction R1, the mill pot 40 can be rotated in the same direction as the revolution, and the rotation speed can be increased.
Thereby, it is possible to freely change the acceleration / revolution ratio GR (GR = G1 / G2) of the acceleration G1 when the mill pot 40 rotates and the acceleration G2 when the mill pot 40 revolves.

(Sixth embodiment)
As shown in FIG. 15, the dismantled concrete fine grain processing device 67 according to the sixth embodiment is provided inside the mill pot 40 of the dismantled concrete fine grain processing device 10 according to the second embodiment. Along with the fine particles 14, coarse aggregate 68 for concrete is mixed as a medium for grinding.
Thereby, the fine aggregate 32 and the fine powder 34 can be separated in a short time by not only the disintegration concrete fine particles 14 being rubbed together but also between the dismantled concrete fine particles 14 and the coarse aggregate 68 for concrete. .

At this time, the coarse aggregate 68 for concrete has substantially the same density as the fine aggregate 32, and the possibility of crushing the fine aggregate 32 is low, and the quality of the regenerated fine aggregate 32 is maintained high. Further, the recycled coarse aggregate 28 of FIG. 4 can be used as the coarse aggregate 68 for concrete. After regeneration, it can be easily separated only by sieving, and both coarse aggregate 68 and fine aggregate 32 can be used as concrete aggregate.
The method of mixing the coarse aggregate 68 for concrete into the mill pot 40 may be introduced from the fine grain supply port 16 together with the dismantled concrete fine grain 14. Other configurations are the same as those of the second embodiment, and a description thereof will be omitted.

(Seventh embodiment)
As shown in FIG. 16 (A), the dismantling concrete fine grain processing device 66 according to the seventh embodiment is disposed inside the mill pot 40 of the dismantling concrete fine grain processing device 10 according to the second embodiment. In addition to the demolition concrete fine particles 14, an iron ball 70 is mixed as a medium for grinding.

As a result, not only the demolition concrete fine particles 14 but also the demolition concrete fine particles 14 and the iron balls 70 are mixed with each other, so that a larger frictional force is generated, and the cement is hardened from the surface of the fine aggregate 32. The body 34 can be separated in a short time.
The method of mixing the iron balls 70 may be introduced into the mill pot 40 from the fine grain supply port 16 together with the dismantled concrete fine grains 14. Further, since the iron ball 70 can be easily collected with a magnet, it is easy to handle.

As shown in FIG. 16B, the iron balls 70 may be used in combination with different diameters. Thereby, the small iron balls 72 are rubbed against the demolition concrete fine particles 14 with a small diameter, and the large iron balls 70 are rubbed against the demolition concrete fine particles 14 with a large diameter. The hardened cement body 34 can be separated from the surface in a short time.
Others are the same as those in the second embodiment, and a description thereof will be omitted.

(Eighth embodiment)
As shown in FIG. 17, the dismantled concrete fine grain processing method 75 according to the eighth embodiment includes three steps: a separation step 76, a fine powder removal / recovery step 77, and a fine aggregate recovery step 78. ing. The details of each process have already been described in the first to seventh embodiments, and the details are omitted.

  First, in the separation step 76, the dismantled concrete fine particles 14 obtained by pulverizing the concrete block are put into the mill pot 40. The demolished concrete fine particles 14 that have been thrown in are separated into fine aggregate 32 and fine powder 34 in the disassembled concrete fine particles 14 within the mill pot 40 that rotates while revolving.

  Next, in the fine powder removing / collecting step 77, the gas W1 is sent from the blower 58 to the inside of the mill pot 40, and the fine powder 34 separated and floated inside the mill pot 40 is removed from the mill pot 40 together with the gas W1. . The fine powder 34 removed together with the gas W <b> 1 is captured by the bag filter 61 of the fine powder collection device 60 provided in the duct 56 and collected by the fine powder collection unit 63.

  Finally, in the fine aggregate recovery step 78, the fine aggregate 32 from which the hardened cement body has been removed and dropped from the mill pot 40 is recovered by the fine aggregate recovery unit 52 provided in the lower part of the mill pot 40.

  As a result, the disassembled concrete fine particles 14 are continuously separated into the fine aggregate 32 and the fine powder 34 inside the mill pot 40 that rotates while revolving without requiring heating energy, and the fine aggregate 32 and the fine powder are separated. 34 can be recovered.

DESCRIPTION OF SYMBOLS 10 Fine aggregate reproduction apparatus 12 Fine grain supply part 14 Fine grain 16 Fine grain supply port 18 Input port 30 Fine powder removal means 36 Planetary mill 38 Mill main body 40 Mill pot 56 Duct (flow path)
58 Air blower 60 Fine powder recovery device 62 Moisture removal device 68 Coarse aggregate 70 Iron ball 75 Fine aggregate regeneration method 76 Separation process 77 Fine powder removal / recovery process 78 Fine aggregate recovery process

Claims (12)

Attached to the mill body of the planetary mill, gas is sent to the mill pot that rotates while revolving around the axis of the mill body,
A processing method for dismantled concrete fine particles, in which disassembled concrete fine particles having cement hardened bodies adhering to the surface of the fine aggregates are rubbed together in the mill pot to separate the fine aggregates and the hardened cement bodies.   The rotation direction of the mill pot is the same direction as the revolution direction of the mill pot, and the ratio GR (GR = G1 / G2) of the gravity acceleration G1 of rotation and the gravity acceleration G2 of revolution is 0.01 or more. The processing method of the demolition concrete fine grain of description.   The processing method of the demolition concrete fine grain of Claim 1 or 2 whose gravity acceleration added to the said demolition concrete fine grain inside the said mill pot by the centrifugal force which arises in the said mill pot which rotates while revolving is 50G or more. Mill pot input, which is collected from the demolition concrete lump and the demolition concrete fine particles with cement hardened body adhering to the surface of the fine aggregate are attached to the mill body of the planetary mill and revolves around the axis of the mill body. A separation step of separating the fine aggregate and the hardened cement body in the mill pot,
A gas is sent from the blower of the fine powder removing means provided outside the planetary mill to the mill pot, and the separated hard powder of the cement is removed from the mill pot, and the removed fine powder is provided in the fine powder removing means. Fine powder removal / recovery process to be collected by the collected fine powder recovery device,
A fine aggregate recovery step of recovering the fine aggregate from which the hardened cement body has been removed by a fine aggregate recovery unit provided below the mill pot;
Dismantling concrete fine grain processing method having.   The processing method of the demolition concrete fine grain of Claim 4 which processes the said demolition concrete fine grain continuously in the order of the said isolation | separation process, the said fine powder removal and collection | recovery process, and the said fine aggregate collection process. A fine grain supply unit that is recovered from the demolition concrete lump and is supplied with demolition concrete fine grains in which the cement hardened body adheres to the surface of the fine aggregate,
A mill main body that revolves around a rotation axis, and the dismantled concrete fine particles that are housed in the mill main body and are input from the fine particle supply unit through an input port rotate while revolving, and the fine aggregate and the cement A planetary mill comprising a mill pot to be separated into a cured body, and
Fine powder removing means provided outside the planetary mill, sending gas from the charging port to the mill pot, and removing fine powder of the hardened cement body from the mill pot;
A fine aggregate recovery unit that is provided below the outlet of the mill pot and recovers the fine aggregate from which the hardened cement body has been removed;
Dismantled concrete fine grain processing equipment. The fine powder removing means includes a flow passage connecting the input port and the fine aggregate recovery unit,
A blower that is provided in the flow passage and circulates gas between the input port, the mill pot, the fine aggregate recovery unit, and the flow passage;
A fine powder collecting device that captures and collects the fine powder discharged from the mill pot together with the gas in the flow path;
A moisture removing device for removing moisture in the gas;
The processing apparatus of the demolition concrete fine grain of Claim 6 which has these.   The dismantling concrete fine grain processing apparatus according to claim 6 or 7, wherein the mill pot generates a surging effect by rubbing the fine grains together by centrifugal force generated by rotating while revolving.   The said fine powder collection | recovery apparatus has a bug filter which capture | acquires the said fine powder, and a fine powder collection | recovery part provided in the lower part of the said bag filter and collect | recovered the captured fine powder. Dismantling concrete fine grain processing equipment.   The processing apparatus of the demolition concrete fine grain of any one of Claims 6-9 with which the said fine powder removal means through which the said gas circulates, the said inlet, the said mill pot, and the said fine aggregate collection | recovery part are sealed.   The disintegrating concrete fine grain processing apparatus according to claim 10, wherein the circulating gas is nitrogen gas.   12. The coarse aggregate for concrete that separates the fine aggregate and the fine powder by mixing with the demolition concrete fine particles or an iron ball is mixed in the mill pot. Dismantling concrete fine grain processing equipment as described in 1.