Gravity separation device and incineration ash treatment system having the gravity separation device

Abstract

The gravity separation device comprises: a separation device body having an inclined and ventilated vibrating plate, a blower for supplying air to the vibrating plate, and a vibrating device for vibrating the vibrating plate; a detector of at least one of a first detector and a second detector, the first detector detecting the concentration of a first metal element in high-gravity separated ash discharged from the vibrating plate, and the second detector detecting the concentration of a second metal element in low-gravity separated ash discharged from the vibrating plate; and a controller that controls the separation device body according to the detected concentration of the detector so that the detected concentration is maintained within a desired range.

Description

Technical Field

[0001] This disclosure relates to a gravity separation device for separating incineration ash from waste and an incineration ash treatment system having the gravity separation device. Background Technology

[0002] In the past, urban waste and other waste were incinerated in incinerators, and the resulting ash was landfilled at final disposal sites.

[0003] In recent years, attempts have been made to recover and recycle metals from incineration ash, or to effectively utilize incineration ash from which metals have been removed in civil engineering materials. This also reduces the amount of incineration ash transported to the final treatment plant, thus extending the lifespan of the final treatment plant.

[0004] Patent document 1 describes the following: Incineration ash composed of particle groups classified into a certain particle size is separated by a dry gravity separator to recover light ash with a smaller specific gravity and heavy ash with a larger specific gravity, thereby separating light ash with a reduced lead content.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2017-140556 Summary of the Invention

[0008] The problem that the invention aims to solve

[0009] The light ash recovered by the dry gravity separator of Patent Document 1, i.e., low-density ash, contains a small amount of high-density particles such as lead, while the heavy ash, i.e., high-density ash, contains a small amount of low-density particles. Here, by keeping the lead concentration in the low-density ash, for example, below a predetermined value, the low-density ash can be effectively utilized as a civil engineering material. Furthermore, by keeping the copper concentration in the high-density ash, for example, above a predetermined value, the valuable metal copper can be efficiently extracted from the high-density ash.

[0010] This disclosure was made to solve the aforementioned problems, and its object is to provide a gravity separation device and an incineration ash treatment system having the gravity separation device, which is capable of separating waste incineration ash into high-gravity ash and low-gravity ash in such a way that at least either the concentration of a first metal element in high-gravity ash or the concentration of a second metal element in low-gravity ash is within a desired range.

[0011] Methods for solving problems

[0012] To achieve the above objectives, a gravity separation device according to one aspect of this disclosure comprises: a separation device body having a vibrating plate, a blower, and a vibrating device, wherein the separation device body separates the incineration ash supplied to the vibrating plate into high-density separated ash, which is mainly composed of high-density particles with a large specific gravity, and low-density separated ash, which is mainly composed of low-density particles with a small specific gravity, and discharges them from the vibrating plate, wherein the vibrating plate is supplied with incineration ash of waste with a particle size within a specified range, the vibrating plate is inclined and has air permeability, and the blower supplies air through the vibrating plate and from the vibrating plate... The air is directed towards the upper surface of the vibrating plate by the vibrating device, which causes the vibrating plate to vibrate in a direction with an inclination angle greater than that of the vibrating plate; a detector of at least one of a first detector and a second detector, the first detector detecting the concentration of a first metal element in the high-density sorted ash discharged from the vibrating plate, and the second detector detecting the concentration of a second metal element in the low-density sorted ash discharged from the vibrating plate; and a controller that controls the main body of the sorting device based on the detected concentration of the detector to maintain the detected concentration within a desired range.

[0013] Additionally, one aspect of the incineration ash treatment system disclosed herein includes: the aforementioned gravity separation device, which is provided with incineration ash discharged from an incinerator of incinerated waste and having a particle size within a specified range; and a carbonation treatment device, which contacts the exhaust gas discharged from the incinerator and purified with low-gravity separated ash discharged from the vibrating plate of the gravity separation device to perform carbonation of the low-gravity separated ash.

[0014] Invention Effects

[0015] The present disclosure, with the structure described above, has the following effect: it can provide a gravity separation device and an incineration ash treatment system having the gravity separation device, which can separate the incineration ash of waste into high-gravity ash and low-gravity ash in a manner that makes at least either the concentration of a first metal element in the high-gravity ash or the concentration of a second metal element in the low-gravity ash within a desired range. Attached Figure Description

[0016] Figure 1 This is a diagram showing a schematic structure of an example of the incineration ash treatment system and its associated equipment according to this embodiment.

[0017] Figure 2 This is a schematic diagram illustrating an example of the gravity separation apparatus and carbonation treatment apparatus of this embodiment.

[0018] Figure 3 This is a graph showing the Cu concentration in high-density sorted ash, based on the results of sorting experiments using two specific gravity sorting devices.

[0019] Figure 4 This is a graph showing the Pb concentration in low-density sorted ash, based on the results of sorting experiments using two specific gravity sorting devices.

[0020] Figure 5 This is a schematic diagram illustrating another example of the gravity sorting device of this embodiment.

[0021] Figure 6 This is a schematic diagram illustrating yet another example of the gravity sorting apparatus of this embodiment.

[0022] Figure 7 This is a perspective view showing another example of the gravity sorting apparatus of this embodiment.

[0023] Figure 8 Only the vibrating plate and electrode plate are shown. Figure 7 Sectional view along line II. Detailed Implementation

[0024] Hereinafter, preferred embodiments of the present disclosure will be described with reference to the accompanying drawings. Furthermore, in all the drawings, the same or equivalent elements will be labeled with the same reference numerals, and repeated descriptions will be omitted. Additionally, for ease of understanding, the drawings schematically illustrate the various constituent elements, and shapes and size ratios are sometimes not shown precisely. Furthermore, the present disclosure is not limited to the following embodiments.

[0025] (Implementation Method)

[0026] Figure 1 This is a diagram showing a schematic structure of an example of the incineration ash treatment system and its associated equipment according to this embodiment.

[0027] exist Figure 1 In the diagram, an incineration unit BS is shown as an associated device of the incineration ash treatment system AS. The incineration unit BS includes an incinerator 7 for incinerating waste, a boiler 8, a turbine 9, a generator 10, a dust collector 11 as a waste gas treatment device, a blower 12, and a chimney 13.

[0028] The incinerator 7 is a grate-type incinerator with a main combustion chamber 7A, a re-combustion chamber 7B, a hopper 71, a feeder 72, and multiple grates 73. Waste fed into the hopper 71 is fed into the main combustion chamber 7A via the feeder 72, where it is dried and ignited on the grates 73. The residual ash m is discharged from the discharge chute 74. This ash m and the ash n falling from the grates 73 are supplied to the incinerator ash conveying device 1. The combustion exhaust gas from the main combustion chamber 7A is completely combusted in the re-combustion chamber 7B.

[0029] The boiler 8 has a first flue 81 located above the reburning chamber 7B, a second flue 82 connected to the first flue 81, and a third flue 83 connected to the second flue 82 and equipped with a superheater 84. The boiler 8 is configured to generate steam by heat recovery from the exhaust gas passing through the first to third flues 81 to 83. The generated steam is sent to a turbine 9 connected to a generator 10 for power generation. In addition, the exhaust gas passing through the boiler 8 is purified by a dust collector 11 and then released into the atmosphere through a blower 12 from a chimney 13.

[0030] In addition, in this embodiment, a portion of the exhaust gas G1 after passing through the dust collector 11 is supplied to the carbonation treatment device 6 via the blower 14, and then the exhaust gas G2 after passing through the carbonation treatment device 6 is released into the atmosphere from the chimney 13 via the blower 12.

[0031] The incineration ash treatment system AS includes an incineration ash conveying device 1, a vibrating conveyor 2, a suspended magnetic separator 3, a grading device 4, a gravity separation device 5, and a carbonation treatment device 6.

[0032] The incineration ash conveying device 1 is a dry conveyor belt configured to provide air g for air cooling from below the metal mesh conveyor belt. The incineration ash conveying device 1 conveys incineration ash P, which consists of ash n discharged from the incinerator 7 and main ash m, and supplies it to the vibrating conveyor 2.

[0033] The incineration ash P supplied to the vibrating conveyor 2 is conveyed by the vibrating conveyor 2 while the iron and other magnetic materials are removed as it passes under the suspended magnetic separator 3, thereby being supplied to the grading device 4.

[0034] The grading device 4 can be, for example, a vibrating screen. The grading device 4 supplies incinerator ash with particle sizes within a specified range to the gravity separation device 5. Incinerator ash with particle sizes outside the specified range is further processed.

[0035] In the gravity separation device 5, the supplied incineration ash is separated into high-gravity ash and low-gravity ash, and the low-gravity ash is provided to the carbonation treatment device 6. Here, high-gravity ash refers to incineration ash whose main component is particles with a larger specific gravity, i.e., high-gravity particles, and low-gravity ash refers to incineration ash whose main component is particles with a smaller specific gravity, i.e., low-gravity particles.

[0036] Figure 2 It is shown Figure 1 A schematic diagram of an example of a gravity separation device 5 and a carbonation treatment device 6. As... Figure 1One example of a gravity sorting device 5 is a gravity sorting device 5A, which includes a sorting device body 5a, first and second detectors 65 and 66, an input device 68, and a controller 69. Here, the sorting device body 5a is the part of the gravity sorting device 5A except for the first and second detectors 65 and 66, the input device 68, and the controller 69.

[0037] The main body 5a of the sorting device has a vibrating plate mounting section 51 on which a vibrating plate 52 and a vibrating device 53 are mounted. The vibrating plate mounting section 51 is box-shaped with an opening on its upper surface, and a breathable metal vibrating plate 52 is disposed in the opening. The vibrating plate mounting section 51 is a roughly rectangular parallelepiped shape that is longer in the direction of arrow x, and when viewed from above, the vibrating plate 52 is a rectangular shape that is longer in the direction of arrow x. That is, the direction of arrow x is the length direction of the vibrating plate mounting section 51. A discharge chute 54 is provided at the upper end of one end of the vibrating plate mounting section 51 in the length direction x, and a discharge chute 55 is provided at the upper end of the other end. In addition, a vibrating device 53 is fixed on each side 51a of the vibrating plate mounting section 51 extending in the length direction x.

[0038] The vibrating plate 52 is mounted at an angle α relative to the horizontal plane 100 on the vibrating plate mounting portion 51, with one end 52a higher than the other end 52b along its length. A feeding port 50 for incineration ash supplied from the grading device 4 is provided above the center of the vibrating plate 52. The vibrating plate 52 has numerous small holes, each the size of which allows air supplied from the blower 62 to pass through and prevents incineration ash supplied from the feeding port 50 from falling. Such a vibrating plate 52 can, for example, be made of a metal mesh with a mesh size of approximately tens of μm. Alternatively, guide plates for preventing incineration ash from falling can be provided at the upper end of each side 51a on both sides of the vibrating plate mounting portion 51 in the width direction (paper depth direction). Additionally, guide plates can also be provided on both sides of each discharge chute 54, 55.

[0039] The vibration device 53, consisting of a vibration motor or the like, causes the vibrating plate mounting portion 51 to vibrate along the direction of arrow S1 with a predetermined period and amplitude. Consequently, the vibrating plate 52, fixed to the vibrating plate mounting portion 51, also vibrates along the direction of arrow S1. The vibration direction of the vibration device 53 (direction of arrow S1) is along a direction with an inclination angle γ that is larger than the inclination angle α of the vibrating plate 52 relative to the horizontal plane 100.

[0040] The vibratory plate mounting part 51 is elastically supported by four springs 56 and 57 installed near the four corners of its bottom surface. Two springs 56 are arranged on the bottom surface of the vibratory plate mounting part 51 on the side of the discharge groove 54, and two springs 57 are arranged on the bottom surface of the vibratory plate mounting part 51 on the side of the discharge groove 55.

[0041] The upper ends of the two springs 56 on the side of the discharge chute 54 are fixed to the bottom surface of the vibrating plate mounting part 51, and the lower ends are fixed to the spring mounting plate 58. The spring mounting plate 58 is fixed to the upper end of the lifting device 59. The lifting device 59 is mounted on the platform 60 and can raise and lower the spring mounting plate 58. The lifting device 59 may also be composed of, for example, a jack with a hydraulic cylinder.

[0042] Additionally, the upper ends of the two springs 57 on the discharge chute 55 side are fixed to the bottom surface of the vibrating plate mounting portion 51, and the lower ends are fixed to the base 60. A blower 62 is installed inside the base 60. A flexible tube 61 is provided between the vibrating plate mounting portion 51 and the base 60, and air from the blower 62 is supplied to the vibrating plate mounting portion 51 through the flexible tube 61. The airflow is adjusted inside the vibrating plate mounting portion 51 so that the air supplied from the blower 62 is blown evenly across the entire surface of the vibrating plate 52.

[0043] In addition, not limited to Figure 2 The structure can be configured such that the vibrating plate 52 and the vibrating plate mounting part 51 are elastically supported in an inclined state and can vibrate in the direction of arrow S1 by the vibrating device 53.

[0044] An electrode plate 63 is disposed above the vibrating plate 52. The electrode plate 63 is rectangular in shape, approximately the same size as the vibrating plate 52, and is disposed at an angle relative to the horizontal plane 100 in the opposite direction to the vibrating plate 52. The angle β of the electrode plate 63 is equal to or greater than the angle α of the vibrating plate 52. Furthermore, a DC power supply 64 is provided to apply a DC voltage with the vibrating plate 52 as the positive electrode and the electrode plate 63 as the negative electrode. By applying a DC voltage from the DC power supply 64, an electric field is generated between the vibrating plate 52 and the electrode plate 63, extending from the vibrating plate 52 towards the electrode plate 63. Additionally, a hole is provided approximately in the center of the rectangular electrode plate 63 for the passage of a feed port 50 for incineration ash.

[0045] Furthermore, the gravity sorting device 5A includes a first detector 65, a second detector 66, an electrode plate drive device 67, an input device 68, and a controller 69. These will be described later.

[0046] In this gravity separation device 5A, the incineration ash supplied from the grading device 4 to the central part of the vibrating plate 52 is separated into high-density separated ash, mainly composed of high-density particles (shown as black circles in the figure), and low-density separated ash, mainly composed of low-density particles (shown as white circles in the figure). Here, the high-density separated ash moves on the vibrating plate 52 towards the discharge chute 54, i.e., towards one end 52a of the vibrating plate 52, and is discharged from the discharge chute 54, for example, stored in the container 101. The low-density separated ash moves on the vibrating plate 52 towards the discharge chute 55, i.e., towards the other end 52b of the vibrating plate 52, and is discharged from the discharge chute 55, supplied to the carbonation treatment device 6. Furthermore, in Figure 2 The low-density ash discharged from the density separation device 5A is provided directly to the carbonation treatment device 6, but it can also be provided to the carbonation treatment device 6 via a conveying device.

[0047] The separation principle of high-density particles and low-density particles in the gravity separation device 5A will be explained. In the incineration ash supplied from the supply port 50, high-density particles contain heavy metals such as Cu and Pb, while low-density particles contain Si, Ca, Al, etc.

[0048] High-density particles move towards the discharge chute 54 due to the vibration of the vibrating plate 52 and are discharged from the discharge chute 54. On the other hand, low-density particles float due to the air blown from below the vibrating plate 52 and are almost unaffected by the vibration of the vibrating plate 52. They move towards the lower direction of the vibrating plate 52 due to gravity and are discharged from the discharge chute 55.

[0049] Furthermore, in this example, a DC voltage is applied between the vibrating plate 52 and the electrode plate 63 via a DC power supply 64, thereby generating an electric field in the space between the vibrating plate 52 and the electrode plate 63. Moreover, the high-conductivity metallic components contained in high-density particles, such as Cu and Pb, are positively charged, and the electric field exerts a force on these particles, as indicated by arrow S3, towards the electrode plate 63. Therefore, it is possible to assist the movement of positively charged high-density particles towards the discharge chute 54. Thus, it is possible to prevent high-density particles from moving towards the discharge chute 55 due to the tilt of the vibrating plate 52, reducing the amount of high-density particles contained in the low-density sorted ash, and improving the sorting accuracy of both low-density and high-density particles.

[0050] In fact, in the gravity separation device 5A, it is not as... Figure 2This process completely separates and sorts high-density particles from low-density particles. Specifically, the high-density sorted ash discharged from the discharge chute 54 is mainly composed of high-density particles, but may contain a small amount of low-density particles. Conversely, the low-density sorted ash discharged from the discharge chute 55 is mainly composed of low-density particles, but may contain a small amount of high-density particles such as Pb.

[0051] The carbonation treatment apparatus 6 is an apparatus for carbonating low-density sorted ash, promoting the carbonation of lead (Pb) and calcium (Ca) contained in the low-density sorted ash. This carbonation treatment apparatus 6 can be constructed, for example, using a screw-type granulator. Figure 2 An example of the carbonation treatment apparatus 6 shown includes a screw granulator 610 and a post-granulation processing unit 620. The carbonation treatment apparatus 6 is supplied with... Figure 1 A portion of the exhaust gas G1 from the dust collector 11 is supplied to the granulation post-processing unit 620, and then from the granulation post-processing unit 620 to the screw granulator 610.

[0052] Low-density ash discharged from the gravity separation device 5 is supplied to the screw granulator 610 through the inlet 612. Water and exhaust gas G1 are also supplied to the screw granulator 610. In the screw granulator 610, the low-density ash is conveyed by the rotation of the screw 611 while reacting with carbon dioxide in the water and exhaust gas G1, promoting carbonation and solidifying into granules. The granulated low-density ash is then supplied to the post-granulation treatment device 620.

[0053] In the granulation post-processing unit 620, the granular low-density sorted ash is conveyed on a conveyor 621 while being further carbonated by exhaust gas G1. The conveyor 621 is, for example, a metal mesh conveyor belt, which supplies exhaust gas G1 from below. Here, carbonation is mainly carried out on the outer portion of the granular low-density sorted ash, resulting in granular low-density sorted ash with increased strength, which is then discharged from the discharge port 622.

[0054] In this carbonation treatment device 6, the Pb, Ca, and other elements contained in the low-density sorted ash react with the carbon dioxide contained in the waste gas G1 to undergo carbonation treatment. Through carbonation of Pb, Pb becomes insoluble, and the low-density sorted ash discharged from the outlet 622 becomes ash with a low concentration of Pb leaching. Therefore, the low-density sorted ash can be effectively utilized as a safe civil engineering material, etc.

[0055] The above was performed as a result of the use of Figure 2Experiment A shows a sorting experiment using the gravity sorting device 5A, and Experiment B shows a sorting experiment using a gravity sorting device with the vibrating plate 52 and DC power supply 64 removed from the gravity sorting device 5A. In Experiment A and Experiment B, the air volume of the blower 62, the vibration number of the vibrating device 61 (i.e., the vibration frequency), and the tilt angle α of the vibrating plate 52 are made equal. Furthermore, in Experiment A, the tilt angle β of the electrode plate 63 is set to the same angle as the tilt angle α of the vibrating plate 52, and a predetermined DC voltage is applied between the vibrating plate 52 and the electrode plate 63 by the DC power supply 64.

[0056] Figure 3 This is a graph showing the Cu concentration in high-density sorted ash, based on the sorting results of Experiments A and B. Figure 3 The Cu concentration ratio on the vertical axis is obtained by dividing the Cu concentration in the high-density sorted ash discharged from the discharge chute 54 by the Cu concentration in the incineration ash supplied from the supply port 50. For example... Figure 3 As shown, the Cu concentration rate in Experiment A was 8.1, while the Cu concentration rate in Experiment B was 2.7. Experiment A showed that the Cu concentration rate was higher than that in Experiment B.

[0057] in addition, Figure 4 This is a graph showing the Pb concentration in low-density sorted ash, based on the sorting results of Experiments A and B. Figure 4 The Pb concentration on the vertical axis is the Pb concentration in the low-density sorted ash discharged from the discharge chute 55. For example... Figure 4 As shown, the Pb concentration in Experiment A was 150 ppm, and the Pb concentration in Experiment B was 243 ppm. Compared with Experiment B, Experiment A can reduce the Pb concentration in low-density sorted ash.

[0058] Compared to the apparatus used in Experiment B, the gravity separation apparatus 5A used in Experiment A, with an electrode plate 63 positioned above the vibrating plate 52 and a DC voltage applied between the vibrating plate 52 and the electrode plate 63, can assist the movement of high-density particles toward one end 52a of the vibrating plate 52. Therefore, according to the gravity separation apparatus 5A, the separation accuracy of low-density and high-density particles contained in the incineration ash of waste can be improved. For example, by keeping the Pb concentration of the low-density separated ash below a specified reference value, the low-density separated ash can be effectively utilized in civil engineering materials, etc.

[0059] The first detector 65 and the second detector 66 are configured, for example, using an elemental analysis device based on LIBS (Laser-Induced Breakdown Spectroscopy), capable of instantaneously analyzing the elemental composition of the target material. The first detector 65 detects in real time the concentration of a first metallic element (e.g., copper) in the high-density sorted ash discharged from the discharge chute 54 and outputs this detected concentration to the controller 69. The second detector 66 detects in real time the concentration of a second metallic element (e.g., lead) in the low-density sorted ash discharged from the discharge chute 55 and outputs this detected concentration to the controller 69.

[0060] The electrode plate drive device 67 of the sorting device main body 5a is a device for changing the tilt angle β of the electrode plate 63. As long as the tilt angle β of the electrode plate 63 can be changed, it can have any structure. For example, the electrode plate drive device 67 can be composed of a support portion supporting the electrode plate 63 and an actuator that vertically rotates the support portion to change the tilt angle β of the electrode plate 63. Here, it can also be configured such that the electrode plate 63, for example, is tilted vertically by rotating the support portion. Figure 2 The left end of the middle varies significantly in height compared to the right end.

[0061] The controller 69 is a computer equipped with an arithmetic unit such as a CPU and a storage unit such as ROM and RAM. It executes a pre-stored program in the storage unit via the CPU to control the overall operation of the gravity sorting device 5A. Specifically, the controller 69 controls the vibration device 53, the blower 62, the DC power supply 64, the lifting device 59, and the electrode plate drive device 67, receiving the respective detection concentrations (copper concentration and lead concentration) from the first detector 65 and the second detector 66. Furthermore, the controller 69 can be a single, centrally controlled controller or multiple controllers that cooperate and control each other in a distributed manner.

[0062] Additionally, the input device 68 is a means for inputting desired information to the controller 69 through user operation.

[0063] The operation control of the gravity separation device 5A will be explained. Here, for example, the desired range of Cu concentration (copper concentration) in the high-density separated ash, which enables efficient extraction of valuable metals such as Cu from high-density separated ash, is set to a range above a predetermined reference value (R1). That is, the reference value R1 is the lower limit of the desired range of copper concentration in the high-density separated ash. Furthermore, the desired range of Pb concentration (lead concentration) in the low-density separated ash, which enables effective utilization of the low-density separated ash in civil engineering materials, is set to a range below a predetermined reference value (R2). That is, the reference value R2 is the upper limit of the desired range of lead concentration in the low-density separated ash.

[0064] In addition, here, the first detector 65 detects the copper concentration of the high specific gravity sorting ash discharged from the discharge chute 54 in real time, and the second detector 66 detects the lead concentration of the low specific gravity sorting ash discharged from the discharge chute 55 in real time.

[0065] In addition, the threshold values ​​r1 for copper concentration in high-density sorted ash and r2 for lead concentration in low-density sorted ash are pre-inputted from the input device 68 to the controller 69 via user operation, and stored in the storage unit of the controller 69. Furthermore, priority information indicating which concentration—copper concentration detected by the first detector 65 or lead concentration detected by the second detector 66—takes priority is also pre-inputted from the input device 68 via user operation and stored in the storage unit of the controller 69. Additionally, the electrode plate drive device 67 is an electrode plate tilt angle changing device that changes the tilt angle β of the electrode plate 63, and the lifting device 59 is a vibrating plate tilt angle changing device that changes the tilt angle α of the vibrating plate 52.

[0066] At a certain moment during the operation of the gravity separation device 5A, the copper concentration detected by the first detector 65 is above the threshold r1, and the lead concentration detected by the second detector 66 is below the threshold r2. Then, the device is set to the following state: the tilt angle α of the vibrating plate 52 of the lifting device 59 is a predetermined angle, the tilt angle β of the electrode plate 63 of the electrode plate drive device 67 is a predetermined angle, the blower 62 operates with a predetermined air volume, the vibrating device 53 operates with a predetermined vibration frequency, and a predetermined voltage is applied through the DC power supply 64.

[0067] Based on the aforementioned state, if the copper concentration detected by the first detector 65 is less than the threshold r1, the controller 69, for example, increases the airflow of the blower 62 by a predetermined amount, and activates the lifting device 59 and the electrode plate drive device 67 to increase the tilt angles α and β by a predetermined angle. Here, the change in the airflow of the blower 62 and the changes in the tilt angles α and β of the vibrating plate 52 and the electrode plate 63 can be performed simultaneously or in a predetermined order. For example, after first increasing the airflow of the blower 62 by a predetermined amount, if the state of copper concentration being less than the threshold r1 persists after a predetermined time, the tilt angles α and β can be increased by a predetermined angle. Alternatively, the order can be reversed.

[0068] In this case, for example, the increase or decrease in copper concentration of high-density sorted ash caused by the increase or decrease in air volume of the blower 62 and the increase or decrease in tilt angles α and β are investigated in advance through experiments, and a program derived from the experimental results is stored in the controller 69 in advance. Based on this program, if the copper concentration detected by the first detector 65 is less than the threshold r1, the controller 69 increases the air volume of the blower 62 by a predetermined amount and increases the tilt angles α and β by a predetermined angle in a manner that makes the concentration greater than or equal to the threshold r1.

[0069] Furthermore, by setting the copper concentration threshold r1 to a value slightly higher than the aforementioned copper concentration reference value R1, the copper concentration of the high-density sorted ash discharged from the discharge chute 54 can be reliably maintained at a concentration above the reference value R1, which is within the desired range. Therefore, the valuable metal Cu can be efficiently extracted from the high-density sorted ash.

[0070] Furthermore, if the lead concentration detected by the second detector 66 exceeds the threshold r2, the controller 69 may, for example, reduce the airflow of the blower 62 by a predetermined amount, and activate the lifting device 59 and the electrode plate drive device 67 to reduce the tilt angles α and β by a predetermined angle. In this case, the change in the airflow of the blower 62 and the change in the tilt angles α and β of the vibrating plate 52 and the electrode plate 63 can be performed simultaneously or in a predetermined order. For example, after first reducing the airflow of the blower 62 by a predetermined amount, if the lead concentration still exceeds the threshold r2 after a predetermined time, the tilt angles α and β can be reduced by a predetermined angle. Alternatively, the order can be reversed.

[0071] In this case, for example, the increase or decrease in lead concentration of low-density sorted ash caused by the increase or decrease in air volume of the blower 62 and the increase or decrease in tilt angles α and β are investigated in advance through experiments, and a program derived from the experimental results is stored in the controller 69 in advance. Based on this program, if the lead concentration detected by the second detector 66 exceeds the threshold r2, the controller 69 reduces the air volume of the blower 62 by a predetermined amount and reduces the tilt angles α and β by a predetermined angle in a manner that brings the lead concentration below the threshold r2.

[0072] Furthermore, by setting the lead concentration threshold r2 to a value slightly lower than the aforementioned lead concentration reference value R2, the lead concentration of the low-density sorted ash discharged from the discharge chute 55 can be reliably maintained at a concentration below the reference value R2, which is within the desired range. Therefore, the low-density sorted ash can be effectively utilized in civil engineering materials and the like.

[0073] As described above, the controller 69 controls, i.e. changes, the air volume of the blower 62 and the tilt angles α and β of the vibrating plate 52 and the electrode plate 63 based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66.

[0074] Furthermore, when the controller 69 simultaneously detects a state where the copper concentration detected by the first detector 65 is less than the threshold r1 and a state where the lead concentration detected by the second detector 66 exceeds the threshold r2, it processes the data based on the aforementioned priority information. That is, when the priority information is set to the copper concentration detected by the first detector 65, control is performed when the copper concentration is less than the threshold r1, but control is not performed when the lead concentration exceeds the threshold r2. Conversely, when the priority information is set to the lead concentration detected by the second detector 66, control is performed when the lead concentration exceeds the threshold r2, but control is not performed when the copper concentration is less than the threshold r1. Therefore, the controller 69 is configured such that, when the control content based on the detection concentration of the first detector 65 (copper concentration) differs from the control content based on the detection concentration of the second detector 66 (lead concentration), control content based on the detection concentration of either the first detector 65 or the second detector 66, predetermined according to the priority information, is prioritized.

[0075] In the above description, the controller 69 controls the airflow of the blower 62 and the tilt angles α and β of the vibrating plate 52 and the electrode plate 63 based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66, but is not limited thereto. For example, the controller 69 may only control the airflow of the blower 62, or it may only control the tilt angles α and β of the vibrating plate 52 and the electrode plate 63.

[0076] Additionally, the controller 69 can also control the vibration number, i.e., the vibration frequency, of the vibration device 53. In this case, for example, the increase or decrease in copper concentration of high-density sorted ash caused by the increase or decrease in the vibration number of the vibration device 53 is investigated in advance through experiments, and a program derived from the experimental results is stored in the controller 69 in advance. Based on this program, when the copper concentration detected by the first detector 65 is less than a threshold r1, the controller 69 increases or decreases the vibration number of the vibration device 53 in a manner that makes it above the threshold r1. Furthermore, the increase or decrease in lead concentration of low-density sorted ash caused by the increase or decrease in the vibration number of the vibration device 53 is investigated in advance through experiments, and a program derived from the experimental results is stored in the controller 69 in advance. Based on this program, when the lead concentration detected by the second detector 66 exceeds a threshold r2, the controller 69 increases or decreases the vibration number of the vibration device 53 in a manner that makes it below the threshold r2.

[0077] Additionally, the controller 69 can also control the applied voltage of the DC power supply 64. In this case, for example, the increase or decrease in copper concentration in high-density sorted ash caused by the increase or decrease in the applied voltage of the DC power supply 64 is investigated in advance through experiments, and a program derived from the experimental results is stored in the controller 69 in advance. Based on this program, if the copper concentration detected by the first detector 65 is less than a threshold r1, the controller 69 increases or decreases the applied voltage of the DC power supply 64 in a manner that makes the threshold r1 or higher. Furthermore, the increase or decrease in lead concentration in low-density sorted ash caused by the increase or decrease in the applied voltage of the DC power supply 64 is investigated in advance through experiments, and a program derived from the experimental results is stored in the controller 69 in advance. Based on this program, if the lead concentration detected by the second detector 66 exceeds a threshold r2, the controller 69 increases or decreases the applied voltage of the DC power supply 64 in a manner that makes the threshold r2 or lower.

[0078] That is, the controller 69 only needs to be configured to control or adjust at least one of the following based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66: the airflow of the blower 62 of the sorting device body 5a, the tilt angles α and β of the vibrating plate 52 and electrode plate 63 of the sorting device body 5a, the vibration frequency of the vibrating device 53 of the sorting device body 5a, and the applied voltage of the DC power supply 64 of the sorting device body 5a. Furthermore, for structures where control is not required, no control structure is needed. For example, if the tilt angles α and β of the vibrating plate 52 and electrode plate 63 are not controlled, the lifting device 59 and the electrode plate drive device 67 may be omitted.

[0079] Figure 5 It is shown Figure 1 A schematic diagram of another example of the gravity sorting device 5. Figure 2 The gravity separation device 5A is equipped with an electrode plate 63, and in contrast, in Figure 5 In the gravity separation device 5B, multiple electrode plates 63a to 63c are arranged along the length direction (arrow x direction) of the vibrating plate 52. That is, in Figure 2 An electrode plate 63 is provided in the main body 5a of the sorting device, and opposite to it, in Figure 5 The main body 5b of the sorting device contains multiple electrode plates 63a to 63c. Apart from this, the structure of the gravity sorting device 5B is similar to... Figure 2 The specific gravity sorting device 5A is the same. Figure 5 The example shown illustrates a case with three electrode plates, but any combination of two or more is acceptable. Figure 5 In, it can also be said Figure 2 One electrode plate 63 is divided into multiple electrode plates 63a to 63c.

[0080] Electrode plates 63a to 63c are each arranged at an angle opposite to that of the vibrating plate 52, and the magnitude of their respective tilt angle β is equal to or greater than the tilt angle α of the vibrating plate 52. Furthermore, the tilt angle β of each of the electrode plates 63a to 63c may not necessarily be the same angle.

[0081] Furthermore, the distance between the higher end of all electrode plates 63a to 63c in the inclined direction and the vibrating plate 52 is configured to be within a specified distance L. The specified distance L is more than... Figure 2 The distance between the higher end of the electrode plate 63 in the inclined direction and the vibrating plate 52 is minimized in the gravity sorting device 5A. By shortening the distance between each electrode plate 63a-63c and the vibrating plate 52, the electric field between them is enhanced, thus more effectively assisting the movement of high-density particles towards the discharge chute 54. Therefore, the number of high-density particles discharged from the discharge chute 55 can be further reduced, and the sorting accuracy can be further improved.

[0082] In this gravity sorting device 5B, the electrode plate driving device 67 is an electrode plate tilt angle changing device that changes the tilt angle β of each electrode plate 63a to 63c. As long as the tilt angle β of each electrode plate 63a to 63c can be changed, it can have any structure. Alternatively, one electrode plate driving device 67 can be provided for each electrode plate (63a to 63c).

[0083] In this gravity separation device 5B, the controller 69 can also perform the same control as in the gravity separation device 5A based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66. That is, in this gravity separation device 5B, the controller 69 only needs to be configured to control at least one of the following based on the detected copper and lead concentrations: the airflow of the blower 62, the tilt angles α and β of the vibrating plate 52 and the electrode plate 63, the vibration number of the vibrating device 53, and the applied voltage of the DC power supply 64.

[0084] In the aforementioned gravity sorting devices 5A and 5B, the tilt angle β of the electrode plates 63, 63a to 63c is greater than or equal to the tilt angle α of the vibrating plate 52, and a DC voltage is applied between the vibrating plate 52 and the electrode plates 63, 63a to 63c. As a result, the electric field generated between the vibrating plate 52 and the electrode plates 63, 63a to 63 facilitates the movement of high-density particles toward the discharge chute 54. Here, when the tilt angle β is greater than the tilt angle α, compared to when the tilt angle β and tilt angle α are equal, the force exerted by the electric field to move the high-density particles toward the electrode plates is applied in a direction closer to the tilt of the discharge chute 54.

[0085] In these gravity sorting devices 5A and 5B, the following structure can also be adopted: the maximum value of the tilt angle α of the vibrating plate 52 is predetermined, and the tilt angle β of the electrode plates 63, 63a to 63c is fixed at a predetermined angle that is above the maximum value of the tilt angle α of the vibrating plate 52. In this case, the electrode plate driving device 67 is not required.

[0086] Figure 6 It is shown Figure 1 A schematic diagram of another example of the gravity sorting device 5. Figure 6 In the gravity separation device 5C, the main body of the separation device 5C is from... Figure 2 The main body 5a of the sorting device is modified by removing the electrode plate 63, DC power supply 64, and electrode plate drive device 67. The structure of the gravity sorting device 5C is otherwise identical. Figure 2 It is the same as the specific gravity sorting device 5A.

[0087] In the case of the gravity separation device 5C, the controller 69 adjusts the applied voltage of the DC power supply 64 based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66. Otherwise, it can perform the same control as the gravity separation device 5A. That is, in the gravity separation device 5C, the controller 69 only needs to be configured to control the airflow of the blower 62 and the tilt angle α of the vibrating plate 52 (refer to...) based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66. Figure 2 At least one of the vibration numbers of the vibration device 53 is required. Furthermore, for structures that are not controlled, a control structure is not necessary. For example, if the tilt angle α of the vibrating plate 52 is not controlled, the lifting device 59 may not be required.

[0088] Figure 7 It is shown Figure 1 A perspective view of another example of the gravity sorting device 5. Figure 8 Only the vibrating plate 52A and the electrode plate 63A are shown. Figure 7 Sectional view along line II.

[0089] In this gravity separation device 5D, the shapes of the vibrating plate 52A and the electrode plate 63A of the main body 5d of the separation device are similar to those of the other two types of separation devices. Figure 2 The vibrating plate 52 and electrode plate 63 of the gravity sorting device 5A are different. In the main body 5d of the gravity sorting device 5D, the structure except for the electrode plate 63A and the DC power supply 64 can be constructed using a known pneumatic worktable. Therefore, the vibrating plate 52A has a side rope with an inclination angle y and an end rope with an inclination angle α. In addition, it has a vibrating device that makes the vibrating plate 52A vibrate in the direction of arrow S1 and a blower that provides an upward airflow to the vibrating plate 52A.

[0090] The vibrating plate 52A is trapezoidal in shape. The upper bottom part of the trapezoidal shape serves as a receiving part 50A for the incineration ash provided from the grading device 4, and the lower bottom part of the trapezoidal shape serves as a discharge outlet for high-density ash and low-density ash. For example, a discharge chute 54A for high-density ash and a discharge chute 55A for low-density ash are arranged at this discharge outlet.

[0091] In this case, such as Figure 8 As shown, the vibrating plate 52A vibrates in the direction of arrow S1, which is along an angle γ larger than the angle α of the vibrating plate 52A. The electrode plate 63A has a shape that is approximately the same size as the portion of the vibrating plate 52A excluding the receiving portion 50A, as shown. Figure 8 As shown, electrode plate 63A is arranged at an angle opposite to that of vibrating plate 52A. The angle β of the angle of inclination of electrode plate 63A is equal to or greater than the angle α of the angle of inclination of vibrating plate 52A.

[0092] The high-density particles contained in the incineration ash supplied to the receiving unit 50A move on the vibrating plate 52A, for example, in the direction shown by arrow a, and are discharged into the high-density sorted ash discharge chute 54A. Meanwhile, the low-density particles move on the vibrating plate 52A, for example, in the direction shown by arrow b, and are discharged into the low-density sorted ash discharge chute 55A. Of course, the high-density sorted ash discharged into the discharge chute 54A contains a small amount of low-density particles, and the low-density sorted ash discharged into the discharge chute 55A contains a small amount of high-density particles.

[0093] In this gravity separation device 5D, for example, a holding section is provided to temporarily hold high-gravity separated ash discharged from the discharge chute 54A, and a first detector 65 detects the copper concentration of the high-gravity separated ash temporarily held in the holding section. Additionally, a holding section is provided to temporarily hold low-gravity separated ash discharged from the discharge chute 55A, and a second detector 66 detects the lead concentration of the low-gravity separated ash temporarily held in the holding section.

[0094] Furthermore, the gravity separation device 5D includes a vibratory plate tilt angle changing device for changing the tilt angle α of the vibratory plate 52A. In this gravity separation device 5D, the controller 69 can also perform the same control as the gravity separation device 5A based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66. That is, in this gravity separation device 5D, the controller 69 only needs to be configured to control at least one of the following based on the detected copper and lead concentrations: the airflow of the blower, the tilt angles α and β of the vibratory plate 52A and the electrode plate 63A, the vibration number of the vibrating device, and the applied voltage of the DC power supply 64.

[0095] Additionally, in this gravity separation device 5D, it is also possible to [sort the components] as relative to [other components]. Figure 2 5A gravity sorting device Figure 5 Like the specific gravity sorting device 5B, the electrode plate 63A is divided into multiple parts.

[0096] Alternatively, a structure can be adopted by removing the electrode plate 63A, DC power supply 64, and electrode plate drive device 67 from the gravity separation device 5D, and this structure can be used as the gravity separation device 5E. In the case of this gravity separation device 5E, the controller 69 adjusts the applied voltage of the DC power supply 64 based on the copper concentration detected by the first detector 65 and the lead concentration detected by the second detector 66, and other than that, it can perform the same control as the gravity separation device 5D.

[0097] In any of the gravity separation devices 5A to 5E described above, the direction of vibration of the incineration ash supplied to the vibrating plates 52 and 52A when viewed from a direction perpendicular to the vibrating plates 52 and 52A (i.e., Figure 2 , Figure 5 , Figure 6 , Figure 7 The ash is separated into high-density and low-density ash in the direction of the arrow (x) and discharged from the vibrating plates 52 and 52A.

[0098] Furthermore, the gravity separation devices 5A to 5E described above have two detectors 65 and 66, but may also have only one. In this case, the aforementioned priority information is not required, and the controller 69 only needs to control the separation device body, such as the airflow of the blower, based on the concentration of the first or second metal element detected by one detector, in a way that maintains the detected concentration within a desired range. In the example above, copper is exemplified as the first metal element detected by the first detector 65, but other metal elements may also be used. Similarly, lead is exemplified as the second metal element detected by the second detector 66, but other metal elements may also be used.

[0099] Based on the foregoing description, many improvements and other embodiments of this disclosure will be apparent to those skilled in the art. Therefore, the foregoing description should be interpreted as illustrative only and is provided to teach those skilled in the art the best mode of implementation of this disclosure. Details regarding how the construction and / or function can be substantially changed without departing from the spirit of this disclosure are also included.

[0100] (Summarize)

[0101] [Project 1]

[0102] A specific gravity separation device according to one aspect of this disclosure comprises: a separation device body having a vibrating plate, a blower, and a vibrating device, the separation device body separating incineration ash supplied to the vibrating plate into high specific gravity separated ash mainly composed of high specific gravity particles and low specific gravity separated ash mainly composed of low specific gravity particles, and discharging them from the vibrating plate, wherein the vibrating plate is supplied with incineration ash of waste with particle size within a specified range, the vibrating plate is inclined and has air permeability, and the blower supplies air through the vibrating plate and from the lower surface of the vibrating plate. The air is directed towards the upper surface side, and the vibration device causes the vibrating plate to vibrate in a direction along an angle of inclination greater than the angle of inclination of the vibrating plate; a detector of at least one of a first detector and a second detector, the first detector detecting the concentration of a first metal element in the high-density sorted ash discharged from the vibrating plate, and the second detector detecting the concentration of a second metal element in the low-density sorted ash discharged from the vibrating plate; and a controller that controls the main body of the sorting device according to the detected concentration of the detector so that the detected concentration is maintained within a desired range.

[0103] According to this structure, the controller controls the main body of the sorting device based on the detected concentration of the detector, so that the detected concentration is maintained within a desired range. Therefore, incineration ash from waste can be sorted into high-density ash and low-density ash in such a way that at least one of the concentration of the first metal element in the high-density ash and the concentration of the second metal element in the low-density ash is within a desired range. For example, by controlling the main body of the sorting device to maintain the concentration of the first metal element in the high-density ash within a desired range, it is possible to prevent the concentration of the first metal element from falling below the lower limit of the desired range, thus ensuring that the concentration of the first metal element is within the desired range. Thus, for example, if the first metal element is copper, the valuable metal copper can be efficiently extracted from the high-density ash. Furthermore, by controlling the main body of the sorting device to maintain the concentration of the second metal element in the low-density ash within a desired range, it is possible to prevent the concentration of the second metal element from exceeding the upper limit of the desired range, thus ensuring that the concentration of the second metal element is within the desired range. Therefore, for example, if the second metallic element is set as lead, it is possible to effectively utilize low-density sorted ash in civil engineering materials, etc.

[0104] [Project 2]

[0105] In the specific gravity sorting device of Project 1, the controller may also be configured to control at least one of the following based on the detected concentration of the detector: the air volume of the blower, the vibration number of the vibration device, and the tilt angle of the vibrating plate.

[0106] According to this structure, for example, when a first detector is included, the controller controls at least one of the following: the airflow of the blower, the vibration frequency of the vibrating device, and the tilt angle of the vibrating plate, so that the concentration of the first metal element in the high-density sorted ash detected by the first detector is maintained within a desired range. This prevents the concentration of the first metal element from falling below the lower limit of the desired range, ensuring that the concentration of the first metal element is within the desired range. For example, if the first metal element is copper, valuable metal copper can be efficiently extracted from the high-density sorted ash. Furthermore, when a second detector is included, the controller controls at least one of the following: the airflow of the blower, the vibration frequency of the vibrating device, and the tilt angle of the vibrating plate, so that the concentration of the second metal element in the low-density sorted ash detected by the second detector is maintained within a desired range. This prevents the concentration of the second metal element from exceeding the upper limit of the desired range, ensuring that the concentration of the second metal element is within the desired range. For example, if the second metal element is lead, the low-density sorted ash can be effectively utilized in civil engineering materials, etc.

[0107] [Project 3]

[0108] In the specific gravity sorting device of Project 1 or 2, the main body of the sorting device may also include: an electrode plate, which is disposed above the vibrating plate at an angle greater than the angle of inclination of the vibrating plate in the opposite direction to the vibrating plate; and a DC power supply, which applies a DC voltage between the vibrating plate and the electrode plate such that the vibrating plate is the positive electrode and the electrode plate is the negative electrode, and the controller is configured to control the applied voltage of the DC power supply according to the detection concentration of the detector.

[0109] According to this structure, the controller controls, for example, the applied voltage of a DC power supply based on the detected concentration of the detector, so that the detected concentration is maintained within a desired range. Thus, incineration ash from waste can be separated into high-density ash and low-density ash in such a way that at least one of the concentrations of the first metal element in high-density ash and the concentration of the second metal element in low-density ash is within a desired range. Furthermore, by applying a DC voltage between the vibrating plate and the electrode plate with the vibrating plate as the positive electrode and the electrode plate as the negative electrode, high-density particles containing metals such as copper and lead become positively charged and are given a force towards the electrode plate through the electric field. Therefore, it is possible to assist the movement of high-density particles towards the discharge direction of high-density ash. Thus, it is possible to prevent high-density particles from moving towards the lower direction of the vibrating plate (the discharge direction of low-density ash), reduce the amount of high-density particles contained in the low-density ash, and improve the separation accuracy of low-density and high-density particles.

[0110] [Project 4]

[0111] In the specific gravity sorting device of Project 3, multiple electrode plates may be arranged in the inclined direction of the vibrating plate, and the distance between the end of the electrode plate at the higher position in the inclined direction and the vibrating plate may be within a specified distance.

[0112] According to this structure, the electric field strength between the vibrating plate and the electrode plate can be prevented from becoming too weak due to the position of the vibrating plate, which can effectively assist the movement of positively charged high-density particles in the discharge direction of high-density sorted ash.

[0113] [Project 5]

[0114] In any of the specific gravity sorting devices in items 1 to 4, the specific gravity sorting device may have both the first detector and the second detector, and the controller is configured such that, when the control content based on the detection concentration of the first detector is different from the control content based on the detection concentration of the second detector, the control content based on the detection concentration of either the first detector or the second detector is preferentially implemented.

[0115] [Project 6]

[0116] Additionally, one aspect of the incineration ash treatment system of the present invention comprises: a gravity separation device as described in any one of items 1 to 5, which is provided with incineration ash discharged from an incinerator of incinerated waste and having a particle size within a specified range; and a carbonation treatment device, which contacts low-gravity separated ash discharged from the vibrating plate of the gravity separation device with purified exhaust gas discharged from the incinerator to perform carbonation of the low-gravity separated ash.

[0117] Here, the low-density ash discharged from the vibrating plate of the gravity sorting device is incineration ash mainly composed of low-density particles, but contains a small amount of high-density particles containing lead. By performing carbonation treatment on this low-density ash, the lead becomes insoluble through carbonation, and the concentration of lead leaching can be suppressed to a low level. Therefore, the low-density ash can be effectively utilized as a safe civil engineering material.

[0118] Label Explanation

[0119] AS: Incineration ash treatment system; 5, 5A, 5B, 5C, 5D: Gravity separation device; 5a, 5b, 5c, 5d: Main body of the separation device; 6: Carbonation treatment device; 7: Incinerator; 52, 52A: Vibrating plate; 53: Vibration device; 62: Blower; 63, 63a, 63b, 63c, 63A: Electrode plate; 64: DC power supply; 65: First detector; 66: Second detector; 69: Controller.

Claims

1. A specific gravity sorting device, comprising: a vibrating plate to which incineration ash of waste having a particle size within a prescribed range is supplied, the vibrating plate being disposed obliquely and having air permeability, an air blower that supplies air that passes through the vibrating plate from a lower surface side toward an upper surface side of the vibrating plate, a vibrating device that vibrates the vibrating plate in a direction along an oblique angle that is larger than an oblique angle of the vibrating plate; a detector of at least either one of a first detector that detects a concentration of a first metal element of high specific gravity sorted ash discharged from the vibrating plate and a second detector that detects a concentration of a second metal element of low specific gravity sorted ash discharged from the vibrating plate; and a controller that controls the sorting device main body based on the detected concentration of the detector so that the detected concentration of the first detector is maintained at a concentration of a first reference value or more or the detected concentration of the second detector is maintained at a concentration of a second reference value or less. A sorting device main body having a vibrating plate, a blower, and a vibrating device, which sorts incineration ash supplied to the vibrating plate into high-density sorted ash having high-density particles with a large specific gravity as a main component and low-density sorted ash having low-density particles with a small specific gravity as a main component and discharges from the vibrating plate, wherein 2. The specific gravity sorting device according to claim 1, wherein the specific gravity sorting device has both the first detector and the second detector, the controller is configured to control at least either one of an air volume of the air blower, a number of vibrations of the vibrating device, and an oblique angle of the vibrating plate based on the detected concentration of the detector.

3. An incineration ash processing system, comprising: the specific gravity sorting device according to claim 1 or 2, to which incineration ash discharged from an incinerator that incinerates waste and having a particle size within a prescribed range is supplied; and a carbonation processing device that contacts low specific gravity sorted ash discharged from a vibrating plate of the specific gravity sorting device with exhaust gas that is discharged from the incinerator and that is subjected to a purification process, and performs carbonation of the low specific gravity sorted ash.

4. A specific gravity sorting device, comprising: a vibrating plate to which incineration ash of waste having a particle size within a prescribed range is supplied, the vibrating plate being disposed obliquely and having air permeability, an air blower that supplies air that passes through the vibrating plate from a lower surface side toward an upper surface side of the vibrating plate, a vibrating device that vibrates the vibrating plate in a direction along an oblique angle that is larger than an oblique angle of the vibrating plate; a detector of at least either one of a first detector that detects a concentration of a first metal element of high specific gravity sorted ash discharged from the vibrating plate and a second detector that detects a concentration of a second metal element of low specific gravity sorted ash discharged from the vibrating plate; and a controller that controls the sorting device main body based on the detected concentration of the detector so that the detected concentration of the first detector is maintained at a concentration of a first reference value or more or the detected concentration of the second detector is maintained at a concentration of a second reference value or less.

5. The specific gravity sorting device according to claim 4, wherein the sorting device main body further comprises: ​ ​ ​ ​ ​ ​ ​ A sorting device main body having a vibrating plate, a blower, and a vibrating device, the sorting device main body sorting incineration ash supplied to the vibrating plate into high-density sorted ash having high-density particles with a large specific gravity as a main component and low-density sorted ash having low-density particles with a small specific gravity as a main component and discharging from the vibrating plate, wherein ​ ​ ​ ​ an electrode plate disposed obliquely above the vibrating plate at an oblique angle that is larger than the oblique angle of the vibrating plate, in a direction opposite to the vibrating plate; and a direct current power source that applies a direct current voltage between the vibrating plate and the electrode plate, with the vibrating plate being the positive electrode and the electrode plate being the negative electrode, the controller configured to control the applied voltage of the direct current power source in accordance with the detected concentration of the detector.

5. The specific gravity sorting device according to claim 4, wherein a plurality of the electrode plates are arranged in the oblique direction of the vibrating plate, the electrode plates are arranged such that the end portion on the high position side in the oblique direction of the electrode plates is within a prescribed distance from the vibrating plate.

6. The specific gravity sorting device according to claim 4 or 5, wherein the specific gravity sorting device has both the first detector and the second detector, the controller configured to, in a case where the control content based on the detected concentration of the first detector and the control content based on the detected concentration of the second detector are different, preferentially perform the control content based on the detected concentration of the detector of either one of the first detector and the second detector that is predetermined in advance.

7. A incineration ash processing system having: the specific gravity sorting device according to claim 4 or 5, which is provided with incineration ash that is discharged from an incinerator that incinerates waste and has a particle diameter within a prescribed range; and a carbonation processing device that causes exhaust gas that is discharged from the incinerator and that is subjected to a purification process to contact with low specific gravity sorted ash that is discharged from the vibrating plate of the specific gravity sorting device, and performs carbonation of the low specific gravity sorted ash.

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