JP2009240953A - Method and device for treating asbestos - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively treat asbestos, while reducing the usage of a fossil fuel and the generation of carbon dioxide. <P>SOLUTION: The device is provided with a mixing-stirring device 4 mixing-stirring an asbestos-containing material 1 and calcined lime 2 while adding water vapor 3 to form a clayey mixture 11, a friction-grinding device 12 frictioning and grinding the clayey mixture 11 formed in the mixing-stirring process 5, and an electric melting device 22 electric-melting crushed materials 21 ground in the friction-grinding process 13, in order, from the upstream side, and is characterized in that the asbestos in the asbestos-containing material 1 is detoxified. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an asbestos treatment method and apparatus.

There is an increasing need to develop technology for easily and safely treating asbestos, which is a cause of environmental pollution and health damage. As such asbestos processing technology, a melting method in which asbestos is introduced into a blast furnace and melted is generally used (for example, see Patent Document 1).
JP2007-319838

  However, the melting method for melting asbestos in a blast furnace has a problem of using a large amount of fossil fuel and a problem of generating a large amount of carbon dioxide in the combustion process of fossil fuel.

  In addition to the above, new problems and other problems may occur in the process leading to the present invention. Such a problem will be described in this section by explaining in the present invention. It can be replaced with the description. However, this column can be used if necessary.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a mixing and stirring step in which an asbestos-containing material and quicklime are mixed and stirred with a mixing and stirring device while adding water vapor to form a clay-like mixture, Friction crushing process in which friction crushing is performed on the clay-like mixture formed in the mixing and agitation process, and the pulverized material crushed in the friction crushing process are electrically melted with an electric melting apparatus. It is characterized by an asbestos treatment method that renders asbestos in an asbestos-containing material harmless by sequentially performing an electric melting step.

  The invention described in claim 2 includes a mixing stirrer that mixes and stirs asbestos-containing material and quicklime with a steam while adding a water vapor to a clay-like mixture, and a clay-like mixture formed in the mixing and stirring step. On the other hand, a friction crushing device that performs friction crushing and an electric melting device that electrically melts the pulverized material that has been crushed in the friction crushing step are provided in order from the upstream side, and asbestos in the asbestos-containing material is reduced. It features an asbestos treatment device that can be rendered harmless.

  According to a third aspect of the present invention, in the above, the mixing and stirring device and the friction crushing device are arranged vertically, and are integrally configured to be generated by the mixing and stirring device. The clay-like mixture is configured to be fed directly to the friction crushing device.

  The invention described in claim 4 is characterized in that, in the above, the electric melting device includes a water vapor generating means capable of generating water vapor to be fed to the mixing and stirring device.

  According to the method of the first aspect of the present invention, the following effects can be obtained by the above configuration. That is, first, in the mixing and stirring step, the asbestos-containing material and quicklime are mixed and stirred with a mixing and stirring device while adding water vapor. Thereby, quick lime and water vapor | steam react and temperature is raised, Asbestos containing material is softened by this temperature rise, and it becomes a clay-like mixture with high fluidity | liquidity. This clay-like mixture can be easily handled and can prevent the contained asbestos from being scattered in the air. In the friction crushing step, the clay-like mixture is subjected to friction crushing with a friction crushing device. Thereby, the asbestos in an asbestos containing material can be physically destroyed (primary destruction). At this time, the temperature of the pulverized product is further increased by the frictional heat. Since this frictional heat has a considerable temperature increasing effect, at this stage, asbestos melt fracture, which is almost the same as the secondary fracture described later, has already occurred in various places. Thereafter, in the electric melting step, the pulverized material that has been crushed in the friction crushing step and whose temperature has been raised is electrically melted by an electric melting device. As a result, asbestos can be easily and completely melt-destructed (secondary destruction) with less input energy. By passing through these steps, asbestos can be treated easily, safely and efficiently. In addition, since there is no direct use of fossil fuel, the amount of fossil fuel used and the amount of carbon dioxide generated can be reduced.

  According to the invention of the device of claim 2, the same effect as that of claim 1 can be obtained by the above configuration.

  According to invention of Claim 3, the following effects can be acquired by the said structure. That is, the clay-like mixture produced by the mixing and stirring device arranged on the upper side can be directly fed to the friction crushing device arranged on the lower side, so that the feeding route is minimized. The device can be reduced in size accordingly. And since the clay-like mixture containing asbestos can be directly delivered by the shortest path | route, without exposing outside, it can be set as a highly safe apparatus structure. Further, since the weight of the mixing and stirring device can be used as a weight in the friction crushing device, it is rational and efficient.

  According to invention of Claim 4, the following effects can be acquired by the said structure. That is, water vapor is generated by the water vapor generating means provided in the electric melting apparatus, supplied to the mixing and stirring apparatus, and used in the mixing and stirring apparatus, thereby effectively utilizing the heat of the electric melting apparatus and further improving energy efficiency. This can be further improved.

  An object of the present invention is to effectively treat asbestos while reducing the amount of fossil fuel used and the amount of carbon dioxide generated.

  Hereinafter, embodiments embodying the present invention will be described together with illustrated examples.

  The following examples have a close relationship with the above-described background art and problems to be solved by the invention. Therefore, when necessary, the descriptions are diverted to each other or necessary corrections are made. And can be diverted.

  1 to 9 show an embodiment of the present invention.

[Configuration] First, the configuration will be described mainly with reference to FIGS.
(1) Asbestos treatment method Asbestos-containing material 1 and quicklime 2 are formed by mixing and stirring process 5 and mixing and stirring process 5 by mixing and stirring with mixing and stirring apparatus 4 while adding water vapor 3 and mixing and stirring process 5. The friction crushing step 13 for crushing the clay-like mixture 11 by the friction crushing device 12 and the pulverized product 21 crushed in the friction crushing step 13 are electrically converted by the electric melting device 22. The asbestos in the asbestos-containing material 1 can be rendered harmless by performing the melting step 23 in order.

(2) Asbestos processing apparatus In order to realize the asbestos processing method of (1) above, an asbestos processing apparatus 31 having the following configuration is provided as an example.

  This asbestos treatment device 31 is mixed with the asbestos-containing material 1 and quicklime 2 while adding water vapor 3 and mixed and stirred to form a clay-like mixture 11 (mixing and stirring step 5). A friction crushing device 12 that performs friction crushing (a friction crushing step 13) and a pulverized product 21 that has been crushed in the friction crushing step 13 are electrically melted with respect to the clay-like mixture 11 formed in The electric melting apparatus 22 and the (electric melting process 23) are provided in order from the upstream side so that the asbestos in the asbestos-containing material 1 can be rendered harmless.

  (3) In the asbestos treatment apparatus 31, preferably, the mixing and stirring apparatus 4 and the friction crushing apparatus 12 are arranged vertically, and are integrally formed so that they are generated by the mixing and stirring apparatus 4. The made clay-like mixture 11 is configured to be capable of being directly fed to the friction crushing device 12 (direct feeding component).

  (4) In the asbestos treatment device 31, the electric melting device 22 is preferably provided (attached) with water vapor generating means 33 capable of generating the water vapor 3 to be fed to the mixing and stirring device 4.

  Hereinafter, a more specific configuration of the asbestos processing apparatus 31 described above will be described.

(5) Mixing and stirring device 4
The mixing and stirring device 4 includes a mixing and stirring device main body 35 that contains the asbestos-containing material 1 and quicklime 2, a charging unit 36 that inputs the asbestos-containing material 1 and quicklime 2 into the mixing and stirring device main body 35, and a mixing and stirring device main body. Steam supply means 37 for supplying water vapor 3 to asbestos-containing material 1 and quicklime 2 in 35, and mixing for asbestos-containing material 1 and quicklime 2 to which water vapor 3 has been added in mixing and stirring device main body 35. And a stirring means 38 for stirring. Further, the mixing and stirring device 4 includes a feeding unit 39 that feeds the clay-like mixture 11 generated by the stirring unit 38 to the friction crushing device 12.

  Here, the mixing and stirring apparatus main body 35 described above is a mixing and stirring tank 41. In this case, the mixing agitation tank 41 has an axis 42 extending in the vertical direction, has an inlet 43 at the upper end, and an outlet 44 at the lower end, and has a gap between the inlet 43 and the outlet 44. It has an internal space 45 that extends upward or downward. The inlet 43 is a relatively large circular opening centered on the axis 42 described above, and the outlet 44 is a relatively small opening formed at a position slightly off the axis 42. Has been. The internal space 45 has a shape in which a side line configured to approach the axis 42 as it goes downward is rotated around the axis 42. Most of the side lines from the upper part to the lower part are linear with a certain inclination (gradually inclined linear part), and the lower part is a curved line whose inclination changes. It is supposed to be (abrupt curve shape part). That is, the internal pressure of the mixing and agitation tank 41 is gradually increased by the gently sloping inclined linear shape portion, and is also rapidly increased by the abrupt contraction curved shape portion so as to be pumped to the friction crushing device 12. It is configured.

  Further, the charging means 36 is a charging chute 46 disposed toward the charging port 43 of the mixing and stirring tank 41. The charging chute 46 has an inclined shape disposed obliquely above the mixing and stirring tank 41. The lower end portion of the charging chute 46 is installed so as to be substantially the same height level as the charging port 43. In addition, the charging chute 46 is arranged so as to be able to be charged toward a substantially intermediate position between the center portion and the outer peripheral portion of the charging port 43 so that both reliable charging and efficient stirring can be achieved. Yes.

  The steam supply means 37 has a steam spray nozzle 47 disposed in the internal space 45 of the mixing and stirring tank 41. In this case, a plurality of water vapor spray nozzles 47 are dispersedly arranged in the internal space 45. In particular, the water vapor injection nozzle 47 is concentrated in the upper half of the internal space 45. The water vapor injection nozzle 47 is installed in consideration so that the water vapor 3 can be efficiently dispersed over the entire internal space 45. In this case, the water vapor injection nozzle 47 is installed so as to inject downward or obliquely downward.

  The stirring means 38 is a paddle-shaped stirring blade 48 disposed in the internal space 45 of the mixing and stirring tank 41. In this case, a plurality of stirring blades 48 are provided in the internal space 45. In particular, the stirring blade 48 is concentrated and installed in substantially the upper half of the internal space 45. The stirring blade 48 has a size, a shape, an attachment angle, and the like that can efficiently stir the entire internal space 45.

  The feeding means 39 has a pressure screw 49 disposed in the internal space 45 of the mixing and stirring tank 41. In particular, the pressure-feed screw 49 is installed in substantially the lower half of the internal space 45 (the portion without the stirring means 38, in this case, the portion from the lower portion of the loosely-shaped portion to the rapidly-shaped portion). . Therefore, the pressure-feed screw 49 has a spiral blade shape corresponding to the lower shape of the internal space 45. The pressure feed screw 49 is configured to efficiently feed the clay-like mixture 11 to the friction crushing device 12.

  Further, in the internal space 45 of the mixing and stirring tank 41, a central shaft portion 51 extending in the vertical direction is disposed at a position on the axis 42. The steam spray nozzle 47, the stirring blade 48, and the pressure feed screw 49 are attached to the central shaft portion 51.

  That is, a plurality of branch shaft portions 52 extending substantially in the radial direction are provided in substantially the upper half of the central shaft portion 51. The branch shaft portion 52 is appropriately shifted in phase with respect to the circumferential direction of the central shaft portion 51, and the position is appropriately shifted with respect to the direction of the axis 42 (vertical direction) of the central shaft portion 51. It is provided so as to have an appropriate length according to the internal space 45 of 41. In this case, for example, the branch shaft portion 52 has a phase of 90 degrees in the circumferential direction, and is provided so as to be gradually shortened while spiraling around the central shaft portion 51. Further, the branch shaft portion 52 is provided so as to have a length slightly shorter than the diameter of each portion of the narrow inner space 45 below the mixing and stirring tank 41.

  The central shaft portion 51 and the branch shaft portion 52 are both hollow and are connected to each other to form steam pipes 53 and 54 through which the steam 3 can flow. Further, a steam spray nozzle 47 is provided at least at the tip of each branch shaft portion 52. In addition to the above, or in place of the above, the water vapor spray nozzle 47 may be provided in an intermediate portion of each branch shaft portion 52, an intermediate portion of the central shaft portion 51, or the like.

  A stirring blade 48 is attached to at least the tip of each branch shaft portion 52. In addition to the above, the stirring blade 48 may be provided in an intermediate portion of each branch shaft portion 52, an intermediate portion of the central shaft portion 51, or the like instead of the above.

  Further, a pressure-feed screw 49 is attached to the lower half portion of the central shaft portion 51.

  The mixing and stirring tank 41 and the central shaft portion 51 are configured to be relatively rotatable around the position of the central shaft portion 51. In this case, the central shaft portion 51 is fixed, and the mixing and stirring tank 41 is installed so as to be rotatable. The mixing agitation tank 41 is provided with a rotation mechanism 56. The rotation mechanism 56 includes a rotation support mechanism portion 57 and a rotation drive mechanism portion 58.

  The rotation support mechanism 57 includes a bearing device 61 that rotatably supports the lower half of the mixing and stirring tank 41 and a guide device 62 that guides the rotation of the upper half of the mixing and stirring tank 41.

  The bearing device portion 61 has a ball bearing structure having an upper race portion 63, a lower race portion 64, and a plurality of bearing balls 65. The upper race part 63 and the lower race part 64 are concentric with the mixing and stirring tank 41 and have a ring shape having a size with a slight gap with respect to the outer periphery of the mixing and stirring tank 41. The upper race part 63 and the lower race part 64 are formed in a size that at least partly overlaps in the vertical direction. And in the overlapping part of the lower surface of the upper race part 63 and the upper surface of the lower race part 64, the upper and lower ball grooves concentric with the mixing agitation tank 41 are respectively formed. A plurality of bearing balls 65 are movably interposed.

  In this case, the upper race portion 63 is on the rotation side. On the other hand, the lower race part 64 is a fixed side.

  For this purpose, the upper race part 63 is attached to the mixing and stirring tank 41 via an attachment bracket 68. This mounting bracket 68 is as shown in FIG. 3, and is attached to the mixing agitation tank 41 so as to be integrally rotatable in the rotational direction and relatively movable in the vertical direction. For this purpose, a key-like protrusion 71 protrudes from the outer periphery of the mixing and stirring tank 41, and an inner surface portion corresponding to the key-like protrusion 71 of the mounting bracket 68 has a slight clearance with respect to the key-like protrusion 71. A key receiving groove 72 that fits and extends in the vertical direction is formed to be recessed.

  The guide device section 62 is as shown in FIG. 4, and is a support roller 73 that abuts on the outer periphery of the mixing and stirring tank 41 and is rotatable in the circumferential direction. The support roller 73 has a rotation shaft 74 parallel to the axis 42 of the mixing and stirring tank 41, and is equally large in number in the circumferential direction of the mixing and stirring tank 41 (three or more locations. Arranged).

  The rotation drive mechanism 58 includes a drive device 75 such as a motor, a speed reduction mechanism 76 mechanically connected to the drive device 75, and a drive gear portion 77 mechanically connected to the speed reduction mechanism 76. Yes. In this case, the drive gear portion 77 is engraved on the outer periphery of the upper race portion 63 and configured to transmit a rotational driving force to the upper race portion 63.

(6) Friction crushing device 12
The friction crushing device 12 includes an upper crush plate 81 and a lower crush plate 82. The upper crush plate 81 and the lower crush plate 82 have a surface (horizontal surface) that is perpendicular to the axis 42 of the mixing and agitation tank 41 and are in contact with each other (pressure contact). The upper crushing plate 81 and the lower crushing plate 82 have the same outer diameter as or slightly larger than the outer diameter of the mixing and stirring tank 41. It is comprised with the abrasion-resistant steel plate made into the disk shape centering on the axial center of the mixing stirring tank 41. As shown in FIG. The upper crushing plate 81 is as shown in FIG. 5 and includes a crushing upper groove portion 83 on the lower surface side. The crushing upper groove 83 is formed substantially from the center of the upper crushing plate 81 toward the outer periphery. In this case, the crushing upper groove 83 is formed by dividing the disk-shaped wear-resistant steel plate into eight fan-shaped sections of the same size adjacent in the circumferential direction by eight boundary lines extending in the radial direction. In addition, a plurality of crushing upper groove portions 83 parallel to one side boundary line are formed in each section. In addition, you may form the upper groove part 83 for crushing with respect to a boundary line. Then, with respect to each crushing upper groove 83, a deep groove and / or wide rough portion 84, a medium deep groove and / or a medium wide middle portion 85, a shallow groove and / or a narrow fine portion are sequentially arranged from the center side. By forming the portions 86, the eyes gradually become finer from the center side toward the outer peripheral side.

  On the other hand, the lower crushing plate 82 is made of a wear-resistant steel plate having a disk shape centered on the axis of the mixing and stirring tank 41. The lower crushing plate 82 includes a crushing lower groove portion on the upper surface side, although not particularly illustrated. The crushing lower groove portion is formed from the center of the lower crushing plate 82 toward the outer periphery. The crushing lower groove portion divides the disk-shaped wear-resistant steel plate into eight fan-shaped sections of the same size adjacent to each other in the circumferential direction by eight boundary lines extending in the radial direction. In addition, a plurality of crushing lower groove portions parallel to the boundary line on the other side (the side opposite to the case of the upper crushing plate 81) are formed. In addition, you may form the lower groove part for crushing with respect to a boundary line. Then, a deep groove and / or a wide rough portion, a medium deep groove and / or a medium wide middle portion, a shallow groove and / or a narrow fine portion are formed in order from the center side for each crushing lower groove portion. By doing so, the eyes gradually become finer from the center side toward the outer peripheral side.

  When the upper crush plate 81 and the lower crush plate 82 are combined, the crushing upper groove portion 83 and the crushing lower groove portion substantially intersect each other, so that the clay-like mixture 11 is rotated by rotation. It is configured to be gradually transferred to the outside while being crushed.

  Furthermore, the upper crushing plate 81 is on the rotation side. On the other hand, the lower crushing plate 82 is a fixed side.

  Therefore, the upper crushing plate 81 is integrally fixed to the bottom of the mixing and stirring tank 41 of the mixing and stirring apparatus main body 35. The upper crushing plate 81 has a supply port 87 that directly communicates with the outlet 44 formed at the bottom of the mixing and stirring tank 41. As shown in FIG. 6, the outlet 44 and the supply port 87 have a bowl shape that is narrow on the center (axis line 42) side and wide on the outside, and the bowl-shaped supply port 87 has at least a rotational direction. On the other hand, the rear side surface is provided with an inclined edge 88 for promoting the entry of the clay-like mixture 11. The inclined edge 88 is inclined so as to expand outward as it proceeds downward, and is formed by cutting or the like.

  Further, the lower crushing plate 82 is integrally fixed to an upper portion of a fixed base 91 described later.

  And as shown in FIG. 7, the outer peripheral edge part of the upper crushing plate 81 and the lower crushing plate 82 is made into the discharge part 92 of the crushed pulverized material 21, A ring-shaped receiving tray 93 that receives the discharged pulverized material 21 is formed. The tray portion 93 is disposed concentrically on the outer periphery of the lower crush plate 82.

  Further, a drop port 94 is formed at one position in the circumferential direction of the tray portion 93. The tray 93 is provided with a collection blade 95 that collects the discharged pulverized material 21 and drops it to the drop port 94. The collective blades 95 are installed so as to be rotatable in the circumferential direction along the inside of the ring-shaped tray part 93. The collective blade 95 has substantially the same shape as the cross-sectional shape of the ring-shaped saucer portion 93. One or a plurality of the collective blades 95 are provided (in this case, two blades having a phase of 180 degrees). The collective blade 95 is attached to the side surface of the mixing and stirring tank 41 via an L-shaped support arm 96 and is configured to be able to rotate together with the mixing and stirring tank 41.

  In particular, as shown in FIG. 1, the mixing and stirring device 4 is built in by the mixing and stirring device 4 and the friction crushing device 12 that are integrally formed by making the mixing and stirring tank 41 a thick heavy object. Thus, an automatic stone mill device with a mixing and stirring function is configured. In addition, the outer periphery of the mixing and stirring tank 41 having a thick wall is formed in a cylindrical shape centering on the axis 42.

(7) Electric melting device 22
The electric melting device 22 includes an electric high-temperature warmer 97 (electric heater device). The electric melting device 22 is installed in the lower portion of the fixed base 91 described above.

  And the above-mentioned water vapor generating means 33 is installed in a portion of the fixed base 91 between the electric high temperature heat generator 97 (upper part) and the lower crushing plate 82 (lower part). The water vapor generation means 33 includes a water vapor generation pipe 98. The water vapor generating tube 98 is a serpentine tube that extends in the horizontal direction inside the fixed pedestal 91 and has a plurality of folded shapes that are folded back and forth multiple times. In particular, the steam generation pipe 98 has an upstream side close to the electric high-temperature heater 97 (located on the lower side) and a downstream side close to the lower crush plate 82 (located on the upper side), and is routed from the bottom to the top. Is configured to go up. A plurality of the steam generation pipes 98 may be arranged in the lateral direction via a header (not shown) or the like. A pump 101 capable of supplying water 99 is attached to the upstream end of the water vapor generating pipe 98. The pump 101 is, for example, a pressure water pump. Further, a steam supply pipe 102 for supplying the generated high-temperature steam 3 to the steam pipes 53 and 54 is connected to the downstream end of the steam generation pipe 98.

  A steam accumulator 103 (steam tank), a pressure gauge 104, and an on-off valve 105 are provided as needed in the middle of the steam supply pipe line 102 as needed.

  Further, an incineration rotating plate 112 is disposed below the electric high temperature heater 97 with a predetermined interval 111. The incineration rotating plate 112 is installed substantially horizontally so as to be substantially parallel to the lower crush plate 82 and the lower surface of the electric high temperature heat generator 97. The predetermined interval 111 described above is such that an amount of the pulverized material 21 that can be electrically melted by the electric high-temperature heater 97 can be placed on the incineration rotating plate 112 during one rotation.

  The lower part of the incineration rotating plate 112 is rotatably supported by a rotating machine 114 via a heat insulating layer 113. As shown in FIG. 8, the heat insulating layer 113 is configured by a layer of refractory bricks 115 and the like installed to a thickness that does not affect the rotating machine 114. The refractory brick 115 is placed on a base plate 116 having a horizontal disk shape. The base plate 116 and the incineration rotating plate 112 are discs disposed concentrically. The base plate 116 and the incineration rotating plate 112 are installed such that their rotation centers coincide with the rotation center of the rotating machine 114. The rotating machine 114 includes an electric turntable 117 and the like. The rotating machine 114 is configured to be able to adjust its rotation speed. Note that the rotation center of the rotating machine 114 does not necessarily need to coincide with the axis 42 of the mixing and stirring tank 41 described above, but it is preferable in order to reduce the size of the asbestos treatment apparatus 31.

  A spraying hopper 121 that can supply the pulverized material 21 from the tray 93 to the incineration rotating plate 112 is provided below the drop port 94 of the tray 93. As shown in FIG. 9, the spraying hopper 121 includes an elongated supply port 122 that extends from the center of the incineration rotating plate 112 to the outer periphery. In this case, the supply port portion 122 extends substantially in the radial direction of the incineration rotating plate 112, but may be inclined with respect to the radial direction. The supply port portion 122 scrapes away the melt 125 that has rotated once by the fact that the upstream side surface (rear side) in the rotation direction of the incineration rotating plate 112 is almost in sliding contact with the surface of the incineration rotating plate 112. Scattering edge setting 123 is set as a possible scraping edge 123, and the downstream side (front side) in the rotational direction is separated from the surface of the incineration rotating plate 112, so that the spreading thickness of the pulverized material 21 can be set. The edge 124 is used.

Further, a discharge chute 126 is connected to an upstream position in the rotation direction adjacent to the scraping edge 123 on the outer periphery of the incineration rotating plate 112. The discharge chute 126 is inclined with a downward gradient from the outer periphery of the incineration rotating plate 112 to the outer side in the radial direction. Further, a side wall 127 for preventing the pulverized material 21 from falling from the incineration rotating plate 112 is provided on the outer periphery of the incineration rotating plate 112 other than the portion where the discharge chute 126 is provided. The side wall 127 is a fixed wall so that the incineration rotating plate 112 can rotate in sliding contact. In addition, the melt 125 discharged | emitted via the discharge chute | shoot part 126 becomes a granular thing, and can be reused as a cement material.
(8) Whole structure of asbestos processing apparatus 31 other than the above Asbestos processing apparatus 31 is accommodated almost entirely inside metal frame 131 as shown in FIG. In this case, the metal frame 131 includes a square bottom plate 131a (or a lower frame), an upper frame 131b having a size and orientation corresponding to the square, and corresponding corner portions of the bottom plate 131a and the upper frame 131b. It has a substantially rectangular parallelepiped frame shape integrally including four substantially vertical column members 131c connecting the two.

  The metal frame 131 can have a highly shielded structure (herein referred to as a shield structure) by attaching face materials to the four side surfaces and the top surface. By making the said face material into transparent face materials, such as a glass plate and a transparent resin panel, the inside can be visually recognized. In addition, since it is necessary to arrange | position this shielding structure about the water supply pipe | tube to the injection | throwing means 36 (input chute 46), the discharge chute | shoot part 126, and the pump 101, it is necessary to provide the insertion port with respect to these suitably. To. Further, by applying an appropriate sealing means to these insertion openings, the metal frame 131 can be made a structure with higher shielding properties (herein referred to as a highly shielding structure). Note that the input chute 46 and the discharge chute 126 are configured to be inserted into a side surface opposite to the metal frame 131. Further, the charging chute 46 and the water supply pipe to the pump 101 are configured to be inserted from the same side surface.

  Then, a rotating machine 114, a heat insulating layer 113, an incineration rotating plate 112, and the like are installed at the bottom in the metal frame 131.

  In addition, a fixed pedestal 91, the above-described automatic stone mill device (mixing and stirring device 4 and friction crushing device 12 and the like) having a mixing and stirring function, and a pump 101 are disposed above the incineration rotating plate 112 with a gap 111. To do. The fixed pedestal 91 and the pump 101 are mounted on the upper part of the intermediate floor 133 attached to the corresponding positions between the four vertical column members 131c of the metal frame 131. The intermediate floor 133 is formed with an opening or the like that can directly face the incineration rotating plate 112 by penetrating the lower surface portion of the electric high temperature heater 97.

  Further, the lower race portion 64 of the rotation support mechanism portion 57 (bearing device portion 61) is fixed to an intermediate mounting bracket 134 that is mounted at a corresponding position between the four vertical column members 131c.

  Further, a support roller 73 of the rotation support mechanism portion 57 (guide device portion 62) is attached to a pair of upper and lower roller support arms 135 attached at corresponding positions between the four vertical column members 131c via the rotation shaft 74. To support.

  Similarly, the steam supply pipe line 102 is erected substantially along one of the four vertical column members 131c, and the water vapor accumulation provided in the column member 131c in the middle of the vapor supply line 102 is provided. The device 103 is fixed through a fixing bracket.

  Further, a cross-shaped reinforcing beam portion 132 as shown in FIG. 2 is provided on the upper frame 131 b of the metal frame 131, and the central shaft portion 51 is used at the intersecting portion of the reinforcing beam portion 132 by using a shaft fixing member 137. The upper end of the is fixed so as not to rotate. The shaft fixing member 137 is configured to be connected to the upper end portion of the steam supply pipe line 102 so as to supply steam to the steam pipe 53.

  In order to further reduce the size of the apparatus, it is most preferable to make the rotation center of the automatic stone mill device, the rotation center of the rotating machine 114, and the center of the metal frame 131 coincide.

  And although it is not specifically illustrated with respect to the inlet 43 of the upper end of the mixing stirring apparatus main body 35 (mixing stirring tank 41), a cover body can be provided. When the lid is provided, the lid is fixed to four vertical column members 131c or the like so that the mixing and stirring tank 41 can rotate in sliding contact. The lid is provided with a small opening through which an input from the input chute 46 can be input.

  “Operation” Next, the operation of this embodiment will be described.

  When operating the asbestos treatment apparatus 31, first, the mixing and stirring tank 41 is rotated. For this purpose, the driving device 75 is driven to transmit the driving force to the mounting bracket 68 via the speed reduction mechanism 76 and the driving gear portion 77 (upper race portion 63), so that the mixing and stirring tank 41 is rotated.

  And while turning on the electric high temperature heat machine 97, the pump 101 is driven, the water 99 is sent to the water vapor generation pipe 98, the water 99 in the water vapor generation pipe 98 is heated with the electric high temperature heat machine 97, Steam 3 is generated. The water vapor 3 is temporarily collected in the water vapor accumulator 103 via the vapor supply line 102, and the pressure is adjusted by the pressure gauge 104, and the vapor pipes 53 and 54 and the water vapor injection nozzle 47 are adjusted by the on-off valve 105. Sent to.

  In this state, the asbestos-containing material 1 and quicklime 2 are charged into the mixing and stirring tank 41 from the charging chute 46. At this time, the asbestos-containing material 1 is preferably crushed to an appropriate size in advance.

  Then, in the mixing and stirring tank 41, the asbestos-containing material 1 and the quicklime 2 are stirred by the stirring blade 48 and humidified by the steam 3 from the steam spray nozzle 47, and the clay-like mixture 11 is gradually formed. go. At this time, the quick lime 2 reacts with the water vapor 3 to raise the temperature, whereby the fluidity of the clay-like mixture 11 is enhanced.

  The formed clay-like mixture 11 is pumped by the pumping screw 49 to the friction crushing device 12 through the outlet 44 and the supply port 87.

  In the friction crushing device 12, the clay-like mixture 11 is crushed between the upper crush plate 81 and the lower crush plate 82. At this time, the crushing upper groove portion 83 and the crushing lower groove portion are crushed in the order of the coarse portion 84, the middle portion 85, and the fine portion 86, and gradually become powdery. Furthermore, the temperature of the pulverized material 21 of the friction pulverizing apparatus 12 is further increased by the heat from the electric high temperature heat generator 97 and the steam generation pipe 98.

  The powdered pulverized material 21 crushed by the friction crushing device 12 is taken out from the outer peripheral portion between the upper crushed plate 81 and the lower crushed plate 82 to the tray portion 93 and collected by the collecting blade 95. At the same time, it is dropped from the drop port 94 to the incineration rotating plate 112 through the spraying hopper 121.

  The pulverized material 21 dropped onto the incineration rotating plate 112 has its spraying thickness adjusted by a scraping edge 123 provided at the supply port 122 of the spraying hopper 121. Then, while the incineration rotating plate 112 makes one rotation, it is electrically melted by the electric high-temperature warmer 97 to become a harmless powdery melt 125 in which the acicular crystals are completely destroyed.

  Then, when the incineration rotating plate 112 rotates once, the powdery melt 125 is scraped from the incineration rotating plate 112 by the scraping edge portion 123 provided in the supply port portion 122 of the spraying hopper portion 121 and discharged. It is discharged from the chute portion 126. The powdered melt 125 thus obtained is reused as a cement material.

  Thus, according to this embodiment, the following operational effects can be obtained.

  (1) Mixing and stirring step 5 in which asbestos-containing material 1 and quicklime 2 are mixed and stirred with mixing and stirring device 4 while adding water vapor 3 to form clay-like mixture 11, and clay formed in mixing and stirring step 5 The friction crushing step 13 for crushing the mixture 11 with the friction crushing device 12 and the pulverized product 21 crushed in the friction crushing step 13 are electrically melted with the electric melting device 22 By performing the melting step 23 in order, the asbestos in the asbestos-containing material 1 is rendered harmless, whereby the following effects can be obtained.

  That is, first, in the mixing and stirring step 5, the asbestos-containing material 1 and the quicklime 2 are mixed and stirred by the mixing and stirring device 4 while adding the steam 3. Thereby, quick lime 2 and water vapor | steam 3 react, and temperature rises, the asbestos-containing material 1 is softened by this temperature rise, and it becomes the clay-like mixture 11 with high fluidity | liquidity. The clay-like mixture 11 is easy to handle and can prevent the contained asbestos from being scattered in the air.

  In the friction crushing step 13, the friction crushing device 12 performs friction crushing on the clay-like mixture 11. Thereby, the asbestos in the asbestos-containing material 1 can be physically destroyed (primary destruction). At this time, the temperature of the pulverized material 21 is further increased by frictional heat. Since this frictional heat has a considerable temperature increasing effect, at this stage, asbestos melt fracture, which is almost the same as the secondary fracture described later, has already occurred in various places. In addition, when the heat from the electric melting device 22 and the water vapor generating means 33 is added, the asbestos melt fracture is more advantageously and more actively developed.

  Thereafter, in the electric melting step 23, the pulverized product 21 crushed in the friction crushing step 13 and having a raised temperature is electrically melted by the electric melting device 22. As a result, asbestos can be easily and completely melt-destructed (secondary destruction) with less input energy. As a result, asbestos completely destroys the needle-like crystals and is reliably rendered harmless.

  By passing through these steps, asbestos can be treated easily, safely and efficiently. In addition, since there is no direct use of fossil fuel, the amount of fossil fuel used and the amount of carbon dioxide generated can be reduced.

  (2) Mixing and stirring the asbestos-containing material 1 and quicklime 2 with the addition of water vapor 3 to make the clay-like mixture 11 and the clay-like mixture 11 formed in the mixing and stirring step 5 On the other hand, the friction crushing device 12 that performs friction crushing and the electric melting device 22 that electrically melts the pulverized material 21 crushed in the friction crushing step 13 are provided in order from the upstream side, and the asbestos-containing material. Since the asbestos in 1 can be rendered harmless, the same effects as (1) can be obtained.

  (3) In the above, the mixing stirrer 4 and the friction crushing unit 12 are arranged one above the other and are integrally configured so that the clay-like mixture 11 generated by the mixing stirrer 4 is provided. Is configured so that it can be directly fed to the friction crushing device 12, the following effects can be obtained.

  That is, since the clay-like mixture 11 generated by the mixing and stirring device 4 disposed on the upper side can be directly fed to the friction crushing device 12 disposed on the lower side, the feeding path is shortened. The apparatus can be reduced in size accordingly. Moreover, since the clay-like mixture 11 containing asbestos can be directly delivered by the shortest route without being exposed to the outside, a highly safe apparatus configuration can be obtained. Moreover, since the weight of the mixing and stirring device 4 can be used as a weight in the friction crushing device 12, it is rational and efficient.

  (4) In the above, since the electric melting apparatus 22 includes the water vapor generating means 33 that can generate the water vapor 3 to be fed to the mixing and agitating apparatus 4, the following effects can be obtained. That is, steam 3 is generated by the steam generating means 33 provided in the electric melting device 22, supplied to the mixing and stirring device 4, and used in the mixing and stirring device 4, thereby effectively utilizing the heat of the electric melting device 22. In addition, energy efficiency can be further improved.

  Although the embodiments of the present invention have been described in detail with reference to the drawings, the embodiments are only examples of the present invention, and the present invention is not limited to the configurations of the embodiments. Needless to say, design changes and the like within a range not departing from the gist of the invention are included in the present invention. Further, for example, when each embodiment includes a plurality of configurations, it is a matter of course that possible combinations of these configurations are included even if not specifically described. Further, when a plurality of embodiments and modifications are shown, it is needless to say that possible combinations of configurations extending over these are included even if not specifically described. Further, the configuration depicted in the drawings is of course included even if not particularly described. Further, when there is a term of “etc.”, it is used in the sense that the equivalent is included. In addition, when there are terms such as “almost”, “about”, “degree”, etc., they are used in the sense that they include those in a range and accuracy recognized by common sense.

1 is an overall side view of an asbestos treatment apparatus according to an embodiment of the present invention. FIG. 2 is a top view of FIG. 1. It is an enlarged view of the mounting bracket part of FIG. It is an expansion perspective view of the support roller part of FIG. It is a partial bottom view of an upper crush plate. (A) and (b) are partial views of the friction crushing device, respectively. It is an expansion perspective view of the waist part of an automatic stone mill apparatus. It is a partial perspective view around an incineration rotating plate. It is a top view of an incineration rotation board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Asbestos containing material 2 Quicklime 3 Water vapor 4 Mixing and stirring apparatus 5 Mixing and stirring process 11 Mixture 12 Friction crushing apparatus 13 Friction crushing process 21 Ground material 22 Electric melting apparatus 23 Electric melting process 33 Water vapor generation means

Claims (4)

Mixing and stirring asbestos-containing material and quicklime with a mixing stirrer while adding water vapor to a clay-like mixture; and
For the clay-like mixture formed in the mixing and stirring step, a friction crushing step of performing friction crushing with a friction crushing device,
An asbestos treatment method comprising detoxifying asbestos in an asbestos-containing material by sequentially performing an electric melting step of electrically melting the pulverized material crushed in the friction crushing step with an electric melting apparatus. A mixing and stirring device that mixes and stirs the asbestos-containing material and quicklime with water vapor to form a clay-like mixture, and
A friction crushing device that performs friction crushing on the clay-like mixture formed in the mixing and stirring step,
An asbestos treatment characterized in that an asbestos contained in the asbestos-containing material is made harmless by being equipped with an electric melting device for electrically melting the crushed material crushed in the friction crushing process in order from the upstream side. apparatus.   The mixing and stirring device and the friction crushing device are arranged one above the other and are integrally configured, so that the clay-like mixture generated by the mixing and stirring device is directly fed to the friction crushing device. The asbestos treatment apparatus according to claim 2, wherein the asbestos treatment apparatus is configured to be capable of being fed.   The asbestos treatment apparatus according to claim 2 or 3, wherein the electric melting device includes a water vapor generating means capable of generating water vapor to be fed to the mixing and stirring device.

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