Long object sieving method, incineration ash processing method, and vibratory screening machine

Abstract

To provide: a long object sieving method that can sieve long objects and ash components to separate them from each other with good accuracy while sufficiently removing, from the long objects, the ash components adhering to the long objects contained in incineration ash; an incineration ash processing method; and a vibratory sieve machine.SOLUTION: A long object sieving method includes the steps of; charging incineration ash into a flat part of a circular sieve member; moving the incineration ash in a circumferential direction of the sieve member, to separate long objects contained in the incineration ash in a sieve net part of the sieve member from ash components of the incineration ash as on-sieve remaining objects; discharging the on-sieve remaining objects which are separated from the incineration ash and remains on the sieve member without passing the sieve net part from a first discharge part; and discharging the ash components having passed through the sieve net part from a second discharge part as passed-through objects. The flat part is an area of the sieve member that has a substantially fan shape with a central angle of 180° or more, with no open holes provided. The sieve net part is an area of the sieve member that has a substantially fan shape with a central angle of 180° or less, with a plurality of open holes provided.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a method for sieving long objects, a method for treating incineration ash, and a vibrating sieve. [Background technology]

[0002] Patent Document 1 discloses a method for primary sieving of granulated slag using a circular vibrating sieve with a punching plate as a sieving member, which includes a flat plate portion without punched holes in the center and a sieve portion that extends annularly around the center portion and has numerous punched holes. This method involves feeding granulated slag into the center of the punching plate while vibrating the sieve member with the circular vibrating sieve. The granulated slag fed to the center portion diffuses and moves radially or while rotating radially toward the outer edge of the sieve member due to the vibration of the sieve member. The needle-shaped particles in the granulated slag (needle-shaped slag) lie almost horizontally on the flat plate portion, and therefore move in this state without rising up during the diffusion and movement of the granulated slag. Therefore, the needle-shaped particles do not fall through the punched holes and are sieved out as oversized particles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-181414 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, ash components of the incineration ash usually adhere to the surface of long objects (e.g., long foreign objects with a needle-like shape) contained in incineration ash such as garbage. In the method of Patent Document 1, when incineration ash is charged to the center, the distance and time the incineration ash travels from the center to the sieve section tend to be short. Therefore, since the incineration ash immediately moves from the center to the sieve section, there is a possibility that the ash components adhering to the long objects will be sieved as over-sieved material without being separated from the long objects. In this case, there is a concern that the separation of the long objects and the ash components will be insufficient in the downstream sorting machine.

[0005] Therefore, the present disclosure describes a method for sieving long objects, a method for processing incineration ash, and a vibrating sieve that can accurately sift the long objects and ash components while sufficiently removing ash components adhering to the long objects contained in the incineration ash from the long objects. [Means for solving the problem]

[0006] One example of a method for sieving long objects includes feeding incineration ash into a flat portion of a circular sieve member, vibrating the sieve member with a drive unit to move the incineration ash in the circumferential direction of the sieve member, separating the long objects contained in the incineration ash as oversized matter from the ash components of the incineration ash in the sieve mesh portion of the sieve member, discharging the oversized matter that was separated from the incineration ash and did not pass through the sieve mesh portion and remained on the sieve member from a first discharge unit, and discharging the ash components that passed through the sieve mesh portion as undersized matter from a second discharge unit. The flat portion is a generally fan-shaped region of the sieve member with a central angle of 180° or more and has no through holes. The sieve mesh portion is a generally fan-shaped region of the sieve member with a central angle of 180° or less and has multiple through holes. [Effects of the Invention]

[0007] The method for sieving long objects, the method for processing incineration ash, and the vibrating sieve disclosed herein make it possible to accurately sift the long objects and ash components contained in the incineration ash while sufficiently removing the ash components adhering to the long objects from the long objects. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram showing an example of an incineration ash treatment facility. [Figure 2] FIG. 2 is a cross-sectional side view of an example of a vibrating sieve. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is a cross-sectional view showing another example of a vibrating sieve machine as viewed from above. [Figure 5] FIG. 5 is a cross-sectional view showing another example of a vibrating sieve machine as viewed from above. [Figure 6] FIG. 6 is a schematic diagram showing another example of an incineration ash treatment facility. [Figure 7] FIG. 7 is a schematic diagram showing another example of an incineration ash treatment facility. DETAILED DESCRIPTION OF THE INVENTION

[0009] In the following description, the same elements or elements having the same functions will be designated by the same reference numerals, and redundant explanations will be omitted. Note that in this specification, when referring to the top, bottom, right, and left of a figure, the directions of the reference numerals in the figure will be used as the reference.

[0010] [Configuration of incineration ash treatment facility] The configuration of the incineration ash treatment facility 1 will be described with reference to Figure 1. The incineration ash treatment facility 1 is configured to separate metallic foreign matter M1, M2 and long objects M3 from bottom ash W1 in waste incineration ash, for example. The bottom ash W1 is incineration ash discharged from the bottom of a waste incineration facility, such as a stoker furnace. On the other hand, ash discharged together with the exhaust gas from the waste incineration facility is called fly ash. The incineration ash treatment facility 1 includes conveying units Cv1 to Cv7, a hopper 2, sorters S1 to S3, a crusher 3, and a vibrating sieve machine 100.

[0011] The conveying units Cv1 to Cv7 are configured to operate based on control signals from a control unit (not shown) and convey various objects downstream. The conveying units Cv1 to Cv7 may be, for example, vibration conveyors or belt conveyors.

[0012] The hopper 2 is configured to receive and temporarily store bottom ash W1 from, for example, incineration ash of a waste incineration facility. The bottom ash W in the hopper 2 is transported to the sorter S1 by conveyors Cv1 and Cv2 (see arrows Ar1 and Ar2 in FIG. 1).

[0013] The sorter S1 (first sorter) operates based on a control signal from the control unit and is configured to separate metallic foreign matter M1 mixed in the main ash W1 from the hopper 2. The sorter S1 may be, for example, a magnetic sorter using a permanent magnet or an electromagnet.

[0014] The metallic foreign matter M1 separated in the sorter S1 may be collected in a collection container 4 (see arrow Ar3 in FIG. 1). The metallic foreign matter M1 may be, for example, iron ore. The metallic foreign matter M1 may be sold to an external dealer as a valuable resource. The residue W2 remaining after the metallic foreign matter M1 is separated from the bottom ash W1 in the sorter S1 is supplied to the sorter S2 (see arrow Ar4 in FIG. 1).

[0015] The sorter S2 (sieve) operates based on a control signal from the control unit and is configured to sieve the residue W2 into over-sieve material W3 (first over-sieve material) larger than a predetermined particle size and the remaining under-sieve material W4 (first under-sieve material). The sorter S2 may be any of a variety of screen types, such as a grizzly type, trommel type, finger type, mesh type, disc type, rotary type, or roll type.

[0016] The oversized material W3 sieved in the sorter S2 is supplied to the crusher 3 (see arrow Ar5 in FIG. 1). The undersized material W4 sieved in the sorter S2 is conveyed by the conveying section Cv3 and supplied to the sorter S3 (see arrows Ar6 and Ar7 in FIG. 1).

[0017] The sorter S3 (second sorter) operates based on a control signal from the control unit, and is configured to separate metallic foreign matter M2 mixed in with the under-sieve material W4 from metallic foreign matter M2 mixed in with the under-sieve material W7 (described later) sieved by the vibrating sieve machine 100, from the under-sieve materials W4, W7. The sorter S3 may be, for example, a sorter that utilizes eddy currents.

[0018] The metal foreign matter M2 separated in the sorter S3 may be transported by the transport unit Cv4 to the collection container 5 and collected in the collection container 5 (see arrows Ar8 and Ar9 in FIG. 1). The metal foreign matter M2 may be, for example, non-ferrous metals such as nickel, chromium, manganese, cobalt, aluminum, magnesium, copper, and zinc. The metal foreign matter M2 may be sold to an external dealer as a valuable resource. The ash component W5, which is the residue remaining after the metal foreign matter M2 is separated from the undersize materials W4 and W7 in the sorter S3, may be temporarily stored in the ash yard 7 (see arrow Ar10 in FIG. 1). The ash component W5 may be reused as a cement raw material, etc.

[0019] The crusher 3 is configured to operate based on a control signal from the control unit and crush the over-sieve material W3. The crusher 3 may be, for example, a rotary hammer type crusher. In this case, the crusher 3 may be of a horizontal type (in which the rotation axis of the hammer extends horizontally) or a vertical type (in which the rotation axis of the hammer extends vertically). The over-sieve material W3 crushed by the crusher 3 is transported by the transport unit Cv5 as crushed material W6 and supplied to the vibrating sieve machine 100 (see arrows Ar11 and Ar12 in FIG. 1).

[0020] The vibrating sieve machine 100 operates based on a control signal from the control unit, and is configured to sieve the crushed materials W6 from the crusher 3 into long materials M3 (over-sieve materials, second over-sieve materials) that are over-sieve materials larger than a predetermined particle size, and the remaining under-sieve materials W7. Details of the vibrating sieve machine 100 will be described later.

[0021] The long objects M3 separated in the vibrating sieve machine 100 may be transported by the transport section Cv6 to the collection container 6 and collected in the collection container 6 (see arrows Ar13 and Ar14 in FIG. 1). The long objects M3 may be sold as valuable material to an external dealer. The under-sieve material W7 (under-sieve material, second under-sieve material), which is the residue after the long objects M3 are separated from the crushed material W6 in the vibrating sieve machine 100, is transported by the transport section Cv7 and supplied to the sorter S3 (see arrows Ar15 and Ar16 in FIG. 1).

[0022] [Configuration of the vibrating sieve machine] Next, the configuration of the vibrating sieve machine 100 will be described with reference to Figures 2 and 3. As illustrated in Figure 2, the vibrating sieve machine 100 includes a base 110, a drive unit 120, a lower main body 130, and an upper main body 140.

[0023] The base 110 includes a base 111, a support plate 112, and an elastic member 113. The base 111 is fixed to the ground surface GS. The support plate 112 is disposed above the base 111 and is configured to support the lower body 130 and the upper body 140. The elastic member 113 is configured to elastically connect the base 111 and the support plate 112. The elastic member 113 may be, for example, a coil spring.

[0024] The drive unit 120 includes a motor 121 and unbalanced weights 122 and 123. The motor 121 is attached to the support plate 112 via a mounting plate 124 so as to be positioned within an opening 112a provided in the center of the support plate 112. The motor 121 is configured to operate based on a control signal from the control unit and rotate a rotating shaft 121a extending in the vertical direction. The unbalanced weights 122 and 123 are attached eccentrically to the upper and lower ends of the rotating shaft 121a, respectively. Therefore, when the rotating shaft 121a rotates due to the operation of the motor 121, vibrations act on the support plate 112. Because the support plate 112 is connected to the base 111 via an elastic member 113, the vibrations generated in the support plate 112 are amplified and act on the lower body 130 and the upper body 140.

[0025] The lower body 130 is attached on the support plate 112. The lower body 130 includes a cylindrical body 131, a discharge guide 132, and a discharge port 133 (second discharge portion).

[0026] The cylindrical body 131 extends in the vertical direction and may have, for example, a cylindrical shape. The discharge guide 132 is provided inside the cylindrical body 131 and at the bottom of the cylindrical body 131. The discharge guide 132 has a mountain-like shape that is highest at the center and decreases in height toward the outer periphery. The discharge outlet 133 has a cylindrical shape and communicates with the lower space of the sieve member 200 (described later). As illustrated in Figures 2 and 3, the discharge outlet 133 protrudes outward from the outer periphery of the cylindrical body 131. Therefore, the under-screen material W7 that has been sieved in the upper main body 140 and fallen into the discharge guide 132 moves toward the outer periphery of the discharge guide 132 and is discharged to the outside of the vibrating sieve machine 100 through the discharge outlet 133.

[0027] The upper body 140 is attached on top of the lower body 130. The upper body 140 includes a tubular body 141, a discharge port 142 (first discharge portion), the sieve member 200, and a guide member 143. The tubular body 141 extends in the vertical direction and may be, for example, cylindrical. The discharge port 142 is tubular and communicates with the upper space of the sieve member 200. As illustrated in FIGS. 2 and 3, the discharge port 142 protrudes outward from the outer circumferential surface of the tubular body 141. Therefore, the long objects M3 that are sieved in the upper body 140 but do not pass through the sieve member 200 and remain on the sieve member 200 are discharged to the outside of the vibrating sieve machine 100 through the discharge port 142.

[0028] The sieve member 200 is a circular plate-like body, and is provided inside the cylindrical body 141 at the bottom of the cylindrical body 141. The sieve member 200 is detachably attached by bolts or the like to an attachment part 144 fixed to the bottom inside the cylindrical body 141. The attachment part 144 may be a ring-shaped plate-like body, or may be a plurality of arc-shaped plate-like bodies arranged at predetermined intervals along the inner circumferential surface of the cylindrical body 141.

[0029] The crushed material W6 supplied to the vibrating sieve machine 100 by the conveying unit Cv5 falls onto the surface of the sieve member 200 through the supply pipe 300. Since the sieve member 200 is vibrated by the driving unit 120, the crushed material W6 that has fallen onto the surface of the sieve member 200 moves clockwise (in the circumferential direction of the sieve member 200) on the surface of the sieve member 200 (see arrow CR in Figure 3).

[0030] As illustrated in FIG. 3, the sieve member 200 includes a flat portion 210, a sieve mesh portion 220, and a protruding portion 230.

[0031] The flat portion 210 is a region of the sieve member 200 where no through holes are provided, and is a substantially fan-shaped region of the sieve member 200 with a central angle of 180° or more. In the example of Fig. 3, the flat portion 210 is a substantially fan-shaped region of the sieve member 200 with a central angle of about 210°.

[0032] The sieve mesh portion 220 is a region of the sieve member 200 in which a plurality of through holes 221 are provided, and is a substantially fan-shaped region of the sieve member 200 with a central angle of 180° or less. In the example of FIG. 3, the sieve mesh portion 220 is a substantially fan-shaped region of the sieve member 200 with a central angle of about 150°. The diameter of the through holes 221 may be, for example, about 10 mm to 40 mm, about 25 mm to 35 mm, or about 30 mm. The distance (pitch) between adjacent through holes 221 may be about 20 mm to 50 mm. The crushed material W6 supplied to the surface of the sieve member 200 passes through the sieve mesh section 220 and is sieved into long materials M3, which are over-sieved materials remaining on the sieve member 200, and under-sieved materials W7, which pass through the through holes 221 of the sieve mesh section 220 and fall into the discharge guide 132.

[0033] An outlet 142 is located on one boundary BL1 side (right side in FIG. 3) between the flat portion 210 and the sieve mesh portion 220. The outlet of the supply pipe 300 faces the vicinity of the boundary BL1 in the flat portion 210. An outlet 133 is located on the other boundary BL2 side (left side in FIG. 3) between the flat portion 210 and the sieve mesh portion 220.

[0034] The protruding portion 230 is a region in the center of the sieve mesh portion 220 that protrudes from the boundary BL1 side toward the flat portion 210. The protruding portion 230 is provided with a plurality of through holes 231 (other through holes). The diameter of the through holes 231 may be approximately the same as the diameter of the through holes 221. The distance (pitch) between adjacent through holes 231 may be approximately the same as the distance (pitch) between adjacent through holes 221. The crushed material W6 supplied to the surface of the sieve member 200 passes through the protruding portion 230, and is sieved into long objects M3 that are over-sieved objects remaining on the sieve member 200 and under-sieved objects W7 that pass through the through holes 231 of the protruding portion 230 and fall into the discharge guide 132.

[0035] The guide member 143 is disposed on the sieve member 200. The guide member 143 may be formed of a thin metal plate. As illustrated in FIG. 3, the guide member 143 extends from the discharge outlet 142 toward the boundary BL1 of the sieve mesh section 220. In the example of FIG. 3, the tip of the guide member 143 is located near the middle of the boundary BL1. Therefore, the long objects M3, which are the sieved objects that do not pass through the sieve mesh section 220 and remain on the sieve member 200, are guided to the discharge outlet 142 by the guide member 143.

[0036] [Effect] According to the above example, the crushed material W6 introduced into the flat portion 210 of the sieve member 200 moves on the flat portion 210 by 180° or more in the circumferential direction of the sieve member 200 due to the vibration of the sieve member 200. Therefore, the crushed material W6 moves a relatively long distance while being subjected to vibration from when it is introduced into the flat portion 210 to when it reaches the sieve mesh portion 220. Therefore, even if ash components of the incineration ash adhere to the long objects M3 included in the crushed material W6, the ash components are effectively removed from the long objects M3. In addition, because the crushed material W6 is introduced into the flat portion 210, the long objects M3 included in the crushed material W6 reach the sieve mesh portion 220 while remaining lying flat on the flat portion 210 with almost no standing up. Therefore, the long objects M3 are discharged from the discharge port 142 as over-sieved material without falling through the through holes 221 of the sieve mesh part 220, and the ash components fall through the through holes 221 of the sieve mesh part 220 and are discharged from the discharge port 133 as under-sieved material W7. As a result, it is possible to accurately sift the long objects M3 and the ash components while sufficiently removing the ash components adhering to the long objects M3 contained in the incineration ash from the long objects M3.

[0037] According to the above example, the diameter of the plurality of through holes 221 provided in the sieve mesh part 220 can be 10 mm to 40 mm. In this case, the long objects M3 are discharged from the discharge port 142 without passing through the through holes 221 of the sieve mesh part 220, while the lumped ash formed by the ash components of the incineration ash tends to pass through the through holes 221 of the sieve mesh part 220. Therefore, it is possible to sift the long objects M3 and the ash components more accurately.

[0038] Incidentally, a small portion of the crushed material W6 introduced into the flat portion 210 of the sieve member 200 may move in a reverse direction from the flat portion 210 to the discharge port 142 (so-called short pass) in the circumferential direction of the sieve member 200, rather than moving in the order of the flat portion 210, the sieve mesh portion 220, and the discharge port 142. However, according to the above example, the sieve member 200 may include a protruding portion 230. Therefore, even if there is crushed material W6 that attempts to move in a reverse direction from the flat portion 210 to the discharge port 142, the crushed material W6 passes through the protruding portion 230. Furthermore, since the protruding portion 230 is provided with a plurality of through holes 231, when the crushed material W6 passes through the protruding portion 230, the ash component of the crushed material W6 falls through the through holes 231. Therefore, it is possible to more accurately sift the long objects M3 and the ash component.

[0039] According to the above example, a guide member 143 can be arranged on the upper surface of the sieve member 200. In this case, the presence of the guide member 143 makes it possible to properly guide the sieved material remaining on the sieve member 200 to the discharge outlet 142, and also to suppress short-pass of the crushed material W6 introduced into the flat portion 210 of the sieve member 200.

[0040] According to the above example, the sorter S1 separates the metallic foreign matter M1 from the main ash W1. The sorter S3 separates the metallic foreign matter M2 from the undersize material W4. The vibrating sieve machine 100 separates the long objects M3 from the crushed material W6. This makes it possible to accurately separate the foreign matter contained in the main ash W1 into the metallic foreign matter M1, the metallic foreign matter M2, the long objects M3, the ash component W5, and the like.

[0041] [Variations] The disclosure in this specification should be considered to be illustrative in all respects and not restrictive. Various omissions, substitutions, modifications, etc. may be made to the above examples without departing from the scope and spirit of the claims.

[0042] (1) The sieve member 200 is detachably attached to the attachment portion 144 of the cylindrical body 141 by bolts or the like. Therefore, the position of the sieve member 200 relative to the cylindrical body 141 may be appropriately changed in the circumferential direction of the sieve member 200 in accordance with the attachment and detachment of the bolts or the like.

[0043] (2) As illustrated in Fig. 4, the sieve mesh portion 220 may be a generally sector-shaped region with a central angle of about 90°, between about 0° and 90° with respect to an imaginary line extending from the center of the sieve mesh portion 220 toward the discharge outlet 142 (right side). In this case, the tip of the guide member 143 may be located near the middle of the boundary BL1 and inside the sieve mesh portion 220.

[0044] (3) As illustrated in Fig. 5, the sieve mesh portion 220 may be a generally sector-shaped region with a central angle of about 90°, between about 45° and 135° with respect to an imaginary line extending from the center of the sieve mesh portion 220 toward the discharge outlet 142 (right side). In this case, too, the tip of the guide member 143 may be located near the middle of the boundary BL1.

[0045] (4) As illustrated in FIG. 6, the metallic foreign matter M1 separated in the sorter S1 may be transported to the transporter Cv5 as an object W8 by the transporter Cv8 (see arrows Ar17 and Ar18 in FIG. 6). That is, relatively large metallic foreign matter M1 is sorted out in the sorter S1 and supplied to the transporter Cv5 by the transporter Cv8. The transporter Cv8 may be, for example, a vibrating conveyor. In this case, ash components adhering to the metallic foreign matter M1 are removed while the object W8 is being transported by the transporter Cv8.

[0046] As shown in Figure 6, the incineration ash treatment facility 1 may further include a sorter S4. The sorter S4 (third sorter) operates based on a control signal from the control unit and is configured to separate metallic foreign matter M1 present in the mixture of crushed material W6 and transported material W8 being transported in the transport unit Cv5 from the main ash W1. The sorter S1 may be, for example, a magnetic sorter using a permanent magnet or an electromagnet.

[0047] The metal foreign matter M1 separated in the sorter S4 may be transported by the transport unit Cv9 to the collection container 4 and collected in the collection container 4 (see arrows Ar19 and Ar20 in FIG. 1). The residue after the metal foreign matter M1 is separated from the mixture of the crushed material W6 and the transported material W8 in the sorter S4 is supplied to the vibrating sieve machine 100 (see arrow Ar12 in FIG. 1).

[0048] According to the example shown in FIG. 6, relatively large metallic foreign objects M1 selected by the sorter S1 are no longer supplied to the crusher 3, thereby reducing the load on the crusher 3. Meanwhile, relatively small metallic foreign objects M1 not selected by the sorter S1 are crushed by the crusher 3 and then sorted by the sorter S4. That is, the metallic foreign objects M1 supplied to the sorter S4 are pulverized by the crusher 3, facilitating sorting in the sorter S4. Therefore, the remaining material fed to the vibrating sieve 100 contains almost no metallic foreign objects M1. Therefore, the vibrating sieve 100 only needs to sieve out all the foreign objects contained in the main ash W1 except for the metallic foreign objects M1, thereby improving the accuracy of the sieving of the foreign objects. Therefore, the foreign objects contained in the main ash W1 can be accurately separated into metallic foreign objects M1, metallic foreign objects M2, long objects M3, ash components W5, and the like.

[0049] (5) As illustrated in FIG. 7, the incineration ash treatment facility 1 may further include a sorting machine S5 (another sieve). The sorting machine S5 operates based on a control signal from the control unit and is configured to further remove ash components and the like adhering to the long objects M3, which are the over-sieved materials separated from the crushed material W6 by the vibrating sieve machine 100. The sorting machine S5 may be, for example, a wet vibrating sieve machine. A wet vibrating sieve machine is a sieve machine that sieves objects to be sieved by supplying (e.g., spraying) a liquid (e.g., water) to the objects and vibrating the liquid to sieve the objects.

[0050] The long items M3, which are oversized items separated in the sorter S5, may be transported by the transport section Cv6 and collected in the collection container 6 (see arrows Ar21 and Ar14 in FIG. 1). The undersized items W9 (third undersized items), such as ash components, separated from the long items M3 in the sorter S5 are dried in a dryer (not shown) and then supplied to the transport section Cv2 (see arrow Ar22 in FIG. 1).

[0051] According to the example of FIG. 7, the long objects M3 are wet-sieved by the sorter S5, and ash components adhering to the long objects M3 are separated from the long objects M3 by the liquid. This reduces the amount of material passing through the sorter S5, thereby reducing the amount of waste material processed. This reduces the impact on the environment. Furthermore, the under-sieve material W9 sieved by the sorter S5 is dried and then supplied back to the sorter S1, further improving the accuracy of screening out the foreign matter contained in the main ash W1. This allows the foreign matter contained in the main ash W1 to be separated more accurately into metal foreign matter M1, metal foreign matter M2, long objects M3, ash component W5, and the like.

[0052] [Other examples] Example 1. One example of a method for sieving long objects includes feeding incineration ash into a flat portion of a circular sieve member, vibrating the sieve member with a drive unit to move the incineration ash in the circumferential direction of the sieve member, separating the long objects contained in the incineration ash as oversized objects from the ash components of the incineration ash in the sieve mesh portion of the sieve member, discharging the oversized objects that were separated from the incineration ash and did not pass through the sieve mesh portion from a first discharge section, and discharging the ash components that passed through the sieve mesh portion from a second discharge section as undersized objects. The flat portion is a generally fan-shaped region of the sieve member with a central angle of 180° or more and has no through holes. The sieve mesh portion is a generally fan-shaped region of the sieve member with a central angle of 180° or less and has multiple through holes. In this case, the incineration ash introduced into the flat portion of the sieve member moves across the flat portion by more than 180° in the circumferential direction of the sieve member due to the vibration of the sieve member. Therefore, the incineration ash travels a relatively long distance while being subjected to vibration from when it is introduced into the flat portion to when it reaches the sieve mesh portion. Therefore, even if ash components of the incineration ash adhere to long objects contained in the incineration ash, the ash components are effectively removed from the long objects. Additionally, because the incineration ash is introduced into the flat portion, the long objects contained in the incineration ash reach the sieve mesh portion while lying flat on the flat portion, with almost no standing up. Therefore, the long objects are discharged from the first discharge section as over-sieved material without falling through the through-holes of the sieve mesh portion, while the ash components fall through the through-holes of the sieve mesh portion and are discharged from the second discharge section as under-sieved material. As a result, it is possible to accurately sift the long objects and the ash components contained in the incineration ash and adhering to the long objects while sufficiently removing them from the long objects.

[0053] Example 2: In the method of Example 1, the diameter of the plurality of through holes provided in the sieve mesh section may be 10 mm to 40 mm. In this case, the long objects are discharged from the first discharge section without passing through the through holes of the sieve mesh section, while the lumpy ash formed by the ash components of the incineration ash tends to pass through the through holes of the sieve mesh section. This makes it possible to more accurately separate the long objects from the ash components.

[0054] Example 3: In the method of Example 1 or Example 2, the sieve member may further include a protruding portion of the sieve mesh portion extending from the center of the sieve member toward the flat portion and having a plurality of additional through holes. Incidentally, a small portion of the incineration ash introduced into the flat portion of the sieve member may move in a reverse direction from the flat portion to the first discharge portion in the circumferential direction of the sieve member, rather than moving in the order of the flat portion, the sieve mesh portion, and the first discharge portion (so-called short pass). However, in Example 3, since the mesh member includes a protruding portion, even if there is incineration ash attempting to move in a reverse direction from the flat portion to the first discharge portion, the incineration ash passes through the protruding portion. Furthermore, since the protruding portion has a plurality of additional through holes, as the incineration ash passes through the protruding portion, ash components of the incineration ash fall through the multiple additional through holes. This enables more accurate sieving of long objects and ash components.

[0055] Example 4: In the method according to any one of Examples 1 to 3, a guide member may be disposed on the upper surface of the sieve member, extending from the first discharge section toward the sieve mesh section and configured to guide the sieved material remaining on the sieve member to the first discharge section. In this case, the presence of the guide member allows the sieved material remaining on the sieve member to be properly guided to the first discharge section, and also makes it possible to suppress short-pass of incineration ash introduced into the flat section of the sieve member.

[0056] Example 5. An example of a method for treating incineration ash includes separating iron from incineration ash containing long objects using a first separator, sieving the incineration ash after the iron has been separated using a sieve, separating the first under-sieve material sieved by the sieve into non-ferrous metals and ash components using a second separator, crushing the first over-sieve material sieved by the sieve using a crusher, and sieving the crushed first over-sieve material using a vibrating sieve machine equipped with circular sieve members. Sifting the first over-sieve material using a vibrating sieve machine includes feeding the first over-sieve material onto the flat portion of the sieve member, vibrating the sieve member with a drive unit to move the first over-sieve material in the circumferential direction of the sieve member, separating the long objects contained in the first over-sieve material from the ash component of the first over-sieve material in the sieve mesh portion of the sieve member as second over-sieve material, discharging the second over-sieve material that has been separated from the first over-sieve material and remains on the sieve member without passing through the sieve mesh portion from a first discharge section, discharging the ash component of the first over-sieve material that has passed through the sieve mesh portion from a second discharge section as second under-sieve material, and separating the second under-sieve material discharged from the second discharge section into non-ferrous metals and ash components using a second sorter. The flat portion is a generally fan-shaped region of the sieve member with a central angle of 180° or more, and has no through holes. The sieve mesh portion is a generally fan-shaped region of the sieve member with a central angle of 180° or less, and has multiple through holes. In the case of Example 5, the same effects as those of the method of Example 1 can be obtained. Furthermore, in the case of Example 5, it is possible to accurately separate foreign matter contained in incineration ash into ferrous metals, non-ferrous metals, ash components, etc.

[0057] Example 6: The method of Example 5 may further include separating iron ore from the crushed first over-sieve material using a third separator. Feeding the first over-sieve material onto the flat portion of the sieve member may include feeding the first over-sieve material after the iron ore has been separated by the third separator onto the flat portion of the sieve member. In this case, the relatively large iron ore separated by the first separator is no longer fed to the crusher, thereby reducing the load on the crusher. Meanwhile, the iron ore not separated by the first separator is crushed by the crusher and then separated by the third separator. In other words, the iron ore fed to the third separator has been pulverized by the crusher, facilitating separation in the third separator, so the first over-sieve material fed to the vibrating separator contains almost no iron ore. Therefore, the vibrating sieve only needs to sieve out all the foreign matter contained in the incineration ash except for the iron, which increases the accuracy of the sieving of the foreign matter, and therefore makes it possible to more accurately separate the foreign matter contained in the incineration ash into iron, non-ferrous metals, ash components, etc.

[0058] Example 7: The method of Example 5 or Example 6 may further include sieving the second oversized material discharged from the first discharge section using a separate sieve with a liquid, and drying the third undersized material sieved by the separate sieve and supplying it to the first separator. In this case, by wet-sieving the second oversized material using the separate sieve, ash components and the like adhering to the second oversized material are separated from the second oversized material by the liquid. This reduces the amount of oversized material sieved by the separate sieve, thereby reducing the amount of waste material to be processed. This reduces the impact on the environment. Furthermore, since the third undersized material sieved by the separate sieve is dried and then supplied to the first separator again, the accuracy of screening out foreign matter contained in the incineration ash is further improved. Therefore, it becomes possible to separate foreign matter contained in incineration ash into ferrous metals, non-ferrous metals, ash components, etc. with greater accuracy.

[0059] Example 8 In any of the methods of Examples 5 to 7, the diameter of the plurality of through holes provided in the sieve mesh part may be 10 mm to 40 mm. In this case, the same effects as those of the method of Example 2 can be obtained.

[0060] Example 9: In any of the methods of Examples 5 to 8, the sieve member may further include a protruding portion of the sieve mesh portion that extends from the center of the sieve member toward the flat portion and has a plurality of additional through holes. In this case, the same effects as those of the method of Example 3 can be obtained.

[0061] Example 10: In any of the methods of Examples 5 to 9, a guide member may be disposed on the upper surface of the sieve member, extending from the first discharge section toward the sieve mesh section and configured to guide the sieved material remaining on the sieve member to the first discharge section. In this case, the same effects as those of the method of Example 4 can be obtained.

[0062] Example 11. An example of a vibrating sieve machine includes a circular sieve member, a drive unit configured to vibrate the sieve member, a first discharge unit communicating with the space above the sieve member and discharging materials that do not pass through the sieve member and remain on the sieve member during sieving, and a second discharge unit communicating with the space below the sieve member and discharging materials that do not pass through the sieve member during sieving. The sieve member includes a flat portion that is a roughly fan-shaped area with a central angle of 180° or more and has no through holes, and a sieve mesh portion that is a roughly fan-shaped area with a central angle of 180° or less and has multiple through holes. In this case, the same effects as those of the method of Example 1 can be obtained.

[0063] Example 12 In the vibrating sieve machine of Example 11, the diameter of the plurality of through holes provided in the sieve mesh part may be 10 mm to 40 mm. In this case, the same effects as those of the method of Example 2 can be obtained.

[0064] Example 13: In the vibrating sieve machine of Example 11 or Example 12, the sieve member may further include a protruding portion of the sieve mesh portion that extends from the center of the sieve member toward the flat portion and has a plurality of additional through holes. In this case, the same effects as those of the method of Example 3 can be obtained.

[0065] Example 14: The vibrating sieve machine of any of Examples 11 to 13 may further include a guide member disposed on the upper surface of the sieve member so as to extend from the first discharge section toward the sieve mesh section and configured to guide the sieved material remaining on the sieve member to the first discharge section. In this case, the same effects as those of the method of Example 4 can be obtained. [Explanation of symbols]

[0066] 1...Incineration ash treatment equipment, 3...Crusher, 100...Vibrating sieve machine, 120...Drive unit, 133...Discharge outlet (second discharge unit), 142...Discharge outlet (first discharge unit), 143...Guide member, 200...Sieve member, 210...Flat portion, 220...Sieve mesh portion, 221...Through hole, 230...Protrusion, 231...Through hole (another through hole), M1...Metal foreign matter (iron), M2...Metal foreign matter (non-ferrous), M3...Long object (object over the sieve, second sieve material), S1...sorter (first sorter), S2...sorter (sieve), S3...sorter (second sorter), S4...sorter (third sorter), S5...sorter (another sieve), W1...bottom ash (incineration ash), W3...over-sieve material (first over-sieve material), W4...under-sieve material (first under-sieve material), W5...ash components, W6...crushed material, W7...under-sieve material (under-sieve material, second under-sieve material), W9...under-sieve material (third under-sieve material).

Claims

1. Putting incineration ash into a flat portion of a circular sieve member; The sieve member is vibrated by a driving unit to move the incineration ash in the circumferential direction of the sieve member, and the long objects contained in the incineration ash are separated from the ash components of the incineration ash as sieved objects in the sieve mesh part of the sieve member; Discharging the sieve-surface material that has been separated from the incineration ash and has not passed through the sieve mesh section and remains on the sieve member from a first discharge section; and discharging the ash component that has passed through the sieve mesh section from a second discharge section as undersize matter, The flat portion is a generally fan-shaped region of the sieve member having a central angle of 180° or more, and is not provided with a through hole, A method for sieving long objects, wherein the sieve mesh portion is a substantially fan-shaped region of the sieve member with a central angle of 180° or less, and has a plurality of through holes.

2. The method according to claim 1, wherein the diameter of the plurality of through holes provided in the sieve mesh portion is 10 mm to 40 mm.

3. The method according to claim 1 , wherein the sieve member further includes a protruding portion of the sieve mesh portion that extends from a center of the sieve member toward the flat portion and that has a plurality of additional through holes formed therein.

4. A method according to any one of claims 1 to 3, wherein a guide member is disposed on the upper surface of the sieve member, the guide member extending from the first discharge section toward the sieve mesh section and configured to guide the sieved material remaining on the sieve member to the first discharge section.

5. Separating iron from the incineration ash containing long objects using a first separator; Sifting the incineration ash after iron has been separated using a sieve; Separating the first undersize material sieved by the sieve into non-ferrous metals and ash components by a second separator; crushing the first sieve-surface material sieved by the sieve with a crusher; sieving the crushed first sieve-surplus material using a vibrating sieve machine equipped with a sieve member having a circular shape; Sieving the first sieve residue using the vibrating sieve machine includes: Throwing the first sieved material onto a flat portion of the sieve member; vibrating the sieve member with a drive unit to move the first sieve material in a circumferential direction of the sieve member, and separating the long objects contained in the first sieve material as second sieve material in the sieve mesh portion of the sieve member from the ash component of the first sieve material; Discharging the second sieve material, which has been separated from the first sieve material and has remained on the sieve member without passing through the sieve mesh section, from a first discharge section; Discharging the ash component of the first over-sieve material that has passed through the sieve mesh unit from a second discharge unit as a second under-sieve material; and separating the second undersize material discharged from the second discharge section into non-ferrous metals and an ash component by the second separator, The flat portion is a generally fan-shaped region of the sieve member having a central angle of 180° or more, and is not provided with a through hole, A method for treating incineration ash, wherein the sieve mesh portion is a substantially fan-shaped region of the sieve member with a central angle of 180° or less, and is provided with a plurality of through holes.

6. The method further comprises separating iron from the crushed first sieve residue using a third separator; 6. The method according to claim 5, wherein the step of introducing the first sieve material into the flat portion of the sieve member includes introducing the first sieve material into the flat portion of the sieve member after the iron ore has been separated by the third separator.

7. sieving the second sieve-surface material discharged from the first discharge section using a separate sieve with a liquid; 6. The method of claim 5, further comprising drying the third undersize sieved by the other sieve and feeding it to the first sorter.

8. The method according to any one of claims 5 to 7, wherein the diameter of the plurality of through holes provided in the sieve mesh portion is 10 mm to 40 mm.

9. The method according to any one of claims 5 to 7, wherein the sieve member further includes a protrusion portion of the sieve mesh portion extending from the center of the sieve member toward the flat portion and having a plurality of additional through holes.

10. A method according to any one of claims 5 to 7, wherein a guide member is disposed on the upper surface of the sieve member, the guide member extending from the first discharge section toward the sieve mesh section and configured to guide the sieved material remaining on the sieve member to the first discharge section.

11. A sieve member having a circular shape; a drive configured to vibrate the sieve member; a first discharge section that is in communication with the upper space of the sieve member and discharges the sieved matter that does not pass through the sieve member and remains on the sieve member after sieving by the sieve member; a second discharge section that is in communication with the space below the sieve member and that discharges the under-screened matter that passes through the sieve member during sieving by the sieve member; The sieve member includes: a flat portion that is a substantially fan-shaped region with a central angle of 180° or more and has no through-holes; a sieve mesh portion that is a substantially fan-shaped region with a central angle of 180° or less and that has a plurality of through holes.

12. The vibrating sieve machine according to claim 11, wherein the diameter of the plurality of through holes provided in the sieve mesh portion is 10 mm to 40 mm.

13. The vibrating sieve machine according to claim 11 , wherein the sieve member further includes a protruding portion of the sieve mesh portion that extends from a center of the sieve member toward the flat portion and that has a plurality of additional through holes formed therein.

14. A vibrating sieve machine according to any one of claims 11 to 13, further comprising a guide member arranged on the upper surface of the sieve member so as to extend from the first discharge section toward the sieve mesh section, and configured to guide the sieved material remaining on the sieve member to the first discharge section.

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