JP5292482B2 - Wet sorting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet sorting apparatus capable of effectively removing obstacles such as water soluble components and heavy metals by separating and removing bulky objects or others from a powdery or granular material to be treated and classifying the granular powders at the same time while washing by a little amount of water. <P>SOLUTION: The wet sorting apparatus is constituted such that the powdery or granular material to be treated into which the bulky objects are mixed are separated to fine granular objects and middle granular objects by settling velocity difference while washing the same in the U-pipe shaped washing tank 20 having a surging generating device 30, the heavyweight bulky objects are separated and discharged by a conveyer device 22, the washing water in an upper layer is discharged along with the bulky objects and the fine granular objects from an overflowing weir 26, the middle granular objects having settled down in the washing tank are conveyed out to the outside of the tank by a bucket type conveyer device 29, a foraminate conveying face of the conveyer device 22 is formed in a network shape, and a cleaning mechanism for cleaning the network shape conveying face from an upper side outside of the washing tank 20 is arranged in the apparatus. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a wet sorting apparatus that cleans a granular processing object mixed with a coarse material and the like and removes obstacle substances mixed in the processing object.

  When resources such as ash and soil mixed with metal, glass (stones, glass pieces, etc.) and organic materials (rubber, plastic, paper, fiber, wood pieces, etc.) are reused. In addition, it is necessary to separate and remove coarse substances and to remove various water-soluble components and heavy substances such as heavy metals that impede resource recycling.

  For example, when incineration residue such as incineration ash generated at municipal waste incineration facilities is reused as a raw material for cement, coarse materials such as metals, glass and organic materials are separated and removed from the incineration residue and incinerated. It is necessary to remove salt attached to the ash.

  In addition, when purifying and reusing contaminated soil in which miscellaneous waste has been illegally dumped, the soil is excavated to separate and remove coarse materials such as metals, glass, and organic materials, and adhere to soil and sand. It is necessary to remove harmful components such as heavy metals.

  Conventionally, for such a processing object, a method of washing the granular material with water after removing coarse material with a magnetic separator or a vibrating sieve has been adopted, but the water content of the processing object is large. In addition, the powder particles adhere to the metal and cannot be sorted well with a magnetic separator, and the mesh of the vibrating sieve is clogged with organic materials, so frequent maintenance is required. In addition to increasing the number of facilities, the amount of water used for cleaning must be increased, and a large wastewater treatment facility must be installed after the cleaning device. There was a problem of not becoming.

  Therefore, in Patent Document 1, the municipal waste incineration ash held in the water in the aquarium is moved up and down for the purpose of simultaneously removing foreign substances such as stainless steel and contained chlorine from the municipal waste incineration ash. The municipal waste incineration ash was washed with water, and at the same time, the ash components having a relatively low specific gravity were separated from the municipal waste incineration ash by specific gravity selection using the difference in specific gravity, while the relative specific gravity was relatively high. A method for removing chlorine, metals, etc. from municipal waste incineration ash that removes large metal components is proposed.

Further, Patent Document 2 discloses two or more stages as an ash washing method in which coarse particles and fine particles are quickly separated from incinerated ash, and the fine particles are given sufficient time and appropriate stirring to complete the desalting action. A series of mechanical wet classifiers are installed in series, incinerated ash is put into the former classifier, washing water is added to the latter classifier, and washing dehydration and particle classification are performed. Water is moved counter-currently from the latter stage to the former stage, coarse incineration ash is taken out of the system from the latter stage, cleaning liquid containing fine incineration ash is taken out from the previous stage, and then the washing liquid and fine particles are separated. A ash cleaning method for obtaining desalted incineration ash and a salt-containing cleaning solution has been proposed.
Japanese Patent Laid-Open No. 11-90408 JP 2003-80199 A

  However, the specific gravity sorting method as described in Patent Document 1 has a problem that it is not possible to separate and remove various floating substances having a specific gravity smaller than that of the ash mixed in the incinerated ash. As described above, incineration ash and soil with various particle size distributions have different concentrations of obstacles such as salts and heavy metals depending on the particle size, so it is extremely difficult to wash them uniformly in the same tank. is there.

  This is because there is a tendency that the smaller the particle size, the larger the content of the obstacle substance mixed in the granular processing object, and it is more efficient to separate and wash small and large particles. .

  On the other hand, in the cleaning method described in Patent Document 2, it is necessary to separate and remove coarse materials from the incinerated ash in advance, and the conventional problems described above are not solved.

  In view of the above-mentioned problems, the present invention simplifies the equipment and reduces the amount of washing water, but separates and removes the coarse particles from the granular processing object mixed with the coarse particles, and classifies the particles at the same time. An object of the present invention is to provide a wet sorting apparatus capable of efficiently removing obstacle substances such as water-soluble components and heavy metals.

To achieve the above object, feature configuration of a wet sorting system according to the present invention, as described in claim 1 of the document claims, the processing objects thrown into the cleaning tank particulate vertically It is equipped with a conveyor device that receives coarse heavy objects on the perforated transport surface and carries them out of the tank while washing with pulsating washing water. A wet sorting apparatus configured to carry out the medium-sized matter that has passed through the perforated conveying surface and settled in the washing tank to the outside of the tank, and moves the conveying surface of the conveyor device Accordingly, a cleaning mechanism for cleaning the perforated conveyance surface outside the cleaning tank is provided, and the cleaning mechanism is constituted by a brush provided with a steel wire, and the perforated hole is moved along with the movement of the perforated conveyance surface. It is arranged to slide on the back side of the transport surface from above, and the hole Jammed removal target is in that it is configured to be dropped removed downward from the perforated conveying surface.

  When a granular object to be processed is introduced into one opening of the cleaning tank, the granular material adhering to the coarse substance is removed while the washing water pulsates up and down by the pulsation generator, and the coarse substance is removed. Among them, heavy objects with large specific gravity settle, and light objects with small specific gravity float on the water surface. The settled heavy object is received by the perforated conveyance surface of the conveyor device and is carried out of the tank by the conveyor device. The granular material is dissolved while being washed with the pulsating washing water, and settles in the washing water. At this time, the powder having a large particle size has a faster settling speed than the powder having a small particle size, so that the powder having a small particle size floating near the water surface and the powder having a large particle size that settles relatively early. Separated into two layers with granules. Therefore, the granular material having a small particle size flows out of the tank together with the washing water, and the granular material having a large particle size passes through the perforated conveyance surface of the conveyor device and settles. Thereafter, the granular material having a large particle size settled in the cleaning tank is carried out of the cleaning tank.

When metal or glass is sandwiched between the perforated conveyance surface of the conveyor device that carries heavy objects out of the washing tank, it is prevented that the granular material having a large particle diameter passes through the perforated conveyance surface and settles. Therefore, by cleaning the transfer surface outside the washing tank by the cleaning mechanism, it becomes possible to efficiently remove metal and glass, so that the wet sorting apparatus can be operated stably over a long period of time. become. At this time, with the movement of the perforated conveyance surface of the conveyor device, the brush slides on the back surface of the perforated conveyance surface from above, so that the metal or the like clogged in the perforated conveyance surface is on the perforated conveyance surface side. It is very easy to drop and remove from below.

Therefore, it is possible to perform the washing and separation of coarse material efficiently, moreover, a is powdery grains also ing to allow classification, washing simultaneously processing object.

  As described above, according to the present invention, while simplifying the equipment and reducing the amount of washing water, the coarse substances and the like are separated and removed from the granular processing object mixed with the coarse substances, and at the same time, the granular material is removed. It has become possible to provide a wet sorting apparatus capable of classifying and efficiently removing obstacle substances such as water-soluble components and heavy metals.

  Hereinafter, an example in which the wet sorting apparatus according to the present invention is applied to the granular material processing system 1 will be described with reference to the drawings. Here, incineration ash with a particle size of 200 mm or less mixed with metals, glass (stones, glass pieces, etc.) and organic materials (rubber, plastic, paper, fiber, wood pieces, etc.) A case of cleaning selection will be described.

  Incinerated ash has a different chlorine content depending on its particle size, and the smaller the particle size, the higher the chlorine content. In the present granular material processing system, a coarse particle having a particle diameter of 2 mm or more (hereinafter also referred to as “coarse ash”) and a fine particle having a particle diameter of 0.15 mm to 2 mm (hereinafter, referred to as “coarse ash”) based on the chlorine content. Demineralizing treatment is performed efficiently by classifying into fine particles having a diameter smaller than 0.15 mm (hereinafter also referred to as “fine ash”) and changing the cleaning conditions in each case. It is.

  As shown in FIG. 7, the granular material processing system 1 selects a coarse material and a granular material while washing the object to be processed, and the granular material has a larger particle size than the fine particles and the fine particles. The wet sorting device 2 for classifying (coarse ash and fine ash), the first re-washing means 4 for re-washing the fine particles classified by the wet sorting device 2, A second recleaning means 6 for recleaning the granules is provided.

  Further, the cleaning wastewater discharged from the first re-cleaning means 4 is returned to the wet sorting device 2 and the cleaning wastewater discharged from the second re-cleaning means 6 is returned to the second re-cleaning means 2. A second circulation path 9 for returning to the cleaning means is provided, and the cleaning waste water returned through each circulation path is reused as cleaning water.

  As shown in FIG. 1 to FIG. 3, the wet sorting apparatus 2 inputs a processing object into a cleaning tank 20 having a U-shaped side view filled with cleaning water and one opening 20 a of the cleaning tank 20. A vibratory feeder 24 serving as a charging unit, a pulsation generator 30 that pulsates cleaning water from the other opening 20 b of the cleaning tank 20, and a coarse material contained in the granular processing object charged by the feeder 24 The conveyor device 22 that separates and carries out heavy objects out of the coarse material in the washing tank 20 and the cleaning water in the upper layer of the washing tank 20 in the direction opposite to the heavy material carry-out direction together with the lighter ones in the coarse material. An overflow weir 26 serving as a drainage unit for draining, and a conveyor device 29 having a plurality of buckets 29a for carrying out a processing object settled on the bottom 20d of the cleaning tank 20 to the outside of the cleaning tank 20 are provided.

  In the conveyor device 22, an endless conveyor belt 22 c having a conveyance surface with mesh holes is wound around the driving pulley 22 a and the driven pulley 22 b, and a part of the conveyor belt 22 c is one side of the cleaning tank 20. It arrange | positions so that it may immerse from the one end side of the opening part 20a to the other end side.

  One opening 20a of the cleaning tank 20 is formed so as to extend in a lateral direction from the other opening 20b in a front view, and a moving direction of the conveyor belt 22c (a direction from right to left in FIG. 1) Water supply nozzles 23a, 23b, 23c, and 23d that form a water flow in the opposite direction to the above are disposed.

  The shape of the cleaning tank 20 is not limited to the U-shaped tube shape when viewed from the side, and may be configured to have a V-shaped tube shape when viewed from the side. Moreover, you may comprise in the shape where the length of the horizontal direction of one opening part 20a and the other opening part 20b is equal. Furthermore, as shown in FIG. 3, the bottom portion 20 d on which the processing object sinks is not limited to the one in which the bottom wall U-shaped cleaning tank 20 extends downward from the vertical wall, but a broken line in FIG. 3. As shown, it may be formed to extend downward with an inclined wall that becomes wider toward the top.

  Further, the shape of the cleaning tank 20 is not limited to a U-shaped tube shape, and may be a V-shaped tube shape or a Y-shaped tube shape as long as the upper portion is branched into two and the lower portion is connected. May be.

  An overflow weir 26 is provided on the downstream side of the water flow formed by the water jets from the water supply nozzles 23a, 23b, 23c, and 23d. A belt conveyor device 36 and a vibratory feeder 24 for placing the processing object conveyed by the belt conveyor device 36 into the cleaning tank 20 are arranged.

  Further, the cleaning tank 20 is divided into three regions along the extending direction of the conveyor belt 22c by a U-shaped partition wall 20c in a side view, and above the upper edge of the partition wall 20c extending to the one opening 20a side. A separation region is formed in which the object to be treated is separated in the vicinity of the water surface.

  The pulsation generator 30 is installed in the other opening 20b of the cleaning tank 20, and is arranged corresponding to each of the three regions partitioned by the partition wall 20c, and a bellows 37, a rod 32, a plunger 31, and an eccentric sheave 33; , Each of the eccentric sheaves 33 is composed of a single motor 34 connected to the rotating shaft.

  An inverter device for controlling the rotational speed of the motor 34 is provided. The eccentric sheave 33 rotates as the motor 34 rotates, and the plunger 31 moves up and down via the rod 32. As the bellows 37 expands and contracts as the plunger 31 moves up and down, the water surface of one opening 20a of the cleaning tank 21 pulsates in the up and down direction.

  In addition, by providing the pulsation generator 30 with a stroke length adjustment mechanism (not shown) that adjusts the stroke length of the plunger 31 that moves up and down, the height of the pulsating liquid surface can be changed. The accuracy of the separation of the pulverized fluid by the separation and sedimentation speed can be adjusted.

  The stroke length adjustment mechanism adjusts the attachment position of the plunger 31 in the vertical direction, the mechanism for adjusting the length of the rod 32, or the attachment position of the rod 32 to the eccentric sheave 33 in the radial direction of the eccentric sheave 33. It can be realized by any of the mechanisms or a combination thereof.

  The three eccentric sheaves 33 provided corresponding to the three regions are provided with the rotating shafts 35 at different eccentric positions, and are given pulsations having different phases in the respective regions.

  The processing object thrown into the washing water tank 20 from the feeder 24 is dispersed in the separation region by the pulsation in the vertical direction of the washing water and separated by specific gravity while being washed.

  Of the coarse materials mixed in the ash, metals and glass having a large specific gravity (stones, glass pieces, etc.) settle in the separation region while the attached ash is removed by the washing water, and the coarse material unloading port 25 by the conveyor belt 22c. Organic materials (rubber, plastic, paper, fiber, wood chips, etc.) with a small specific gravity float on the water surface and are carried out from the overflow weir 26 according to the water flow from the water supply nozzles 23a, 23b, 23c, 23d. Is done. The drainage from the overflow weir 26 is guided to a draining screen 28 via a drainage basin 27.

  That is, in the wet sorting apparatus 2, a sorting step is performed in which the coarse material mixed in the object to be processed is sorted into a coarse material having a large specific gravity and a coarse material having a small specific gravity.

  In addition, as shown in FIG. 4, the incinerated ash charged into the washing tank 20 is dispersed by the pulsation in the vertical direction of the washing water in the separation region, and the sedimentation speed is large and settles against the upward pulsating flow. Granules (coarse ash and fine ash) A settle in the water tank, and fine ash B with a low sedimentation rate floats in the wash water according to the water flow by the water supply nozzles 23a, 23b, 23c, and 23d and flows from the overflow weir 26. It flows into the drainage basin 27.

  That is, in the wet sorting apparatus 2, the fine particles are separated into medium particles having a particle size larger than the fine particles due to the difference in settling speed in the cleaning tank 20, and the fine particles are carried out from the overflow weir 26 together with the upper cleaning water. Then, a classification process in which the medium particles settle in the washing tank 20 is executed.

  In the course of the specific gravity sorting step and the classification step, obstructive substances such as salt adhering to coarse substances and granular materials are washed away.

  As shown in FIGS. 1, 2, and 4, a water supply nozzle 23 e that injects and supplies the cleaning liquid is disposed between the feeder 24 and the overflow weir 26, and the incinerated ash introduced from the feeder 24 is caused by the difference in sedimentation speed. Until the two layers are separated, the cleaning water is jetted and supplied from the water supply nozzle 23e toward the incinerated ash flowing toward the overflow weir 26.

  For example, even if the ash has a large particle size, if it is put in a semi-dry state, there is a risk that the ash will not sink sufficiently and will flow out of the overflow weir. By this, medium particles having a large particle size can be quickly settled. Further, even incinerated ash in which medium and fine particles are solidified in a dumpling form, it is quickly solved by the wash water sprayed and supplied from the water supply nozzle 23e, and the separation by the sedimentation speed is promoted.

  Accordingly, the distance between the feeder 24 and the overflow weir 26 can be set shorter, and the apparatus can be further downsized.

  The overflow water flowing out to the drainage basin 27 is sent to the first re-cleaning device 4 (see FIG. 7) together with the fine ash after the organic material is removed by the draining screen 28. At this time, the organic material may be washed by spraying washing water on the draining screen 28 part.

  As shown in FIG. 3 and FIG. 6, the medium particles settled on the bottom portion 20 d of the cleaning tank 20 have a plurality of buckets 29 a in which a plurality of small-diameter openings 29 b are formed at the bottom portion arranged side by side along an endless track. While being drained by the bucket conveyor mechanism 29, it is carried out of the tank and further cleaned by the second re-cleaning means 6 (see FIG. 7).

  Of the medium particles and washing water that have been lifted up by the bucket 29a during transport, mainly the washing water flows out from the opening 29b, thereby reducing the content of chlorine derived from the washing water to the next step. Can be supplied to.

  When the opening 29b is formed in the range of the hole diameter of 3 mm to 5 mm and the opening ratio of the bottom surface of 15% to 25%, the moisture content of the medium particles to be carried out is about 50%, and good drainage characteristics are obtained.

  For example, when the bottom portion of the bucket 29a is formed of a woven mesh formed so that the opening 29b is a 3 mm square hole and the bottom surface has an opening rate of 25%, the moisture content of the medium grain is 52%, and the opening 29b has a diameter of 3 mm. When the bottom portion of the bucket 29a is formed of a punched plate formed so as to have an opening rate of 17% on the bottom surface of the round hole, a good water draining characteristic with a moisture content of about 50% can be obtained. If the bottom portion of the bucket 29a is formed of a woven mesh formed so that the opening 29b is a 1 mm square hole and the opening ratio of the bottom surface is 22%, a puddle is formed in the medium particles of the bucket 29a, and water is drained. I can't.

  Further, as shown in FIG. 6 (b), the bucket type conveyor device 29 is provided with a water supply nozzle 29c for injecting rinsing water to spray the medium particles after draining, so that the chlorine remaining in the intermediate particles can be removed. The washing water having a high concentration is replaced with rinsing water. In addition, although the rinse water which passed through the 2nd circulation path 9 is used suitably for rinse water, a new water may be used.

  That is, in the process in which the medium-sized matter having a large particle size that has settled at the bottom 20d of the cleaning tank 20 is lifted up by the bucket 29a and carried out of the tank, the cleaning water having a high concentration of the obstacle substance is drained from the opening. By spraying rinse water from the water supply nozzle 29c onto the processing target after draining, the concentration of the obstacle substance contained in the powder can be greatly reduced.

  A sensor for measuring the chlorine ion concentration or electrical conductivity of the cleaning water filled in the cleaning tank 20 is disposed in the cleaning tank 20, and rinse water supplied and supplied from the water supply nozzle 29c based on the detection value of the sensor. It is preferable to adjust the amount of water. When the chlorine ion concentration or electrical conductivity is high, the amount of rinsing water can be increased to further reduce the chlorine content contained in the medium grain.

  Wash water flowing out of the overflow weir 26 is stored in the storage tank 100 via the first circulation path 9 (see FIG. 7), and then the above-described water supply nozzles 23a, 23b, 23c, 23d, 23e, and The water is circulated to the cleaning tank 20 through a water supply nozzle 20e disposed in the vicinity of the bottom of the cleaning tank 20.

  The direction in which the washing water is ejected from the water supply nozzle 20e is directed to the one opening 20a into which the object to be treated is introduced. The washing water sprayed and supplied upward by the water supply nozzle 20e through the pump capable of adjusting the flow rate forms a flow of washing water that opposes the powder particles that settle in the tank, and the powder particles that solidify and settle in a dumpling form. The body is unraveled, and the small granular material with a large content of the obstacle substance floats upward while being washed along the flow of the washing water, and is discharged from the overflow weir 26. That is, the water injection part which supplies cleaning water from the inside of the washing tank 20 toward the inside of the tank is constituted by the pump and the water supply nozzle 20e.

  The re-washing water supplied from the first circulation path 8 is routed through each of a route for supplying water via the water supply nozzles 23a, 23b, 23c, 23d, and 23e and a route for supplying the rewash water via the water supply nozzle 20e. It is preferable to adjust the supply ratio of the rewashed water. By adjusting the ratio supplied from the water supply nozzle 20e and adjusting the speed of the upward flow in the cleaning tank 20, it is possible to set the particle size to be classified by controlling the sedimentation speed of the powder.

  The conveyor belt 22c of the conveyor device 22 is composed of a woven mesh having a mesh width of 5 to 15 mm, receives unsuitable materials such as bolts, metal pieces, glass pieces, etc. that settle as coarse objects in the washing tank 20, and has a mesh. The medium particles are allowed to pass through to settle toward the bottom.

  For example, a woven net made of a steel wire having a wire diameter of 2 mm can be suitably used so that a square hole having a mesh width of 10 mm has an opening ratio of 70%. When the mesh width is smaller than 5 mm, coarse particles and medium particles cannot be separated due to clogging of the mesh, and when the mesh width exceeds 15 mm, coarse particles often pass through the mesh, resulting in inconvenience in the subsequent washing treatment for the medium particles.

  Moreover, in the punched net, the opening ratio is limited in order to ensure strength, and the medium grain remains on the net, so that the ash reattaches to the discharged metals, which hinders resource recycling. is there.

  As shown in FIGS. 1, 3, and 5, the conveyor belt 22 c that receives a coarse object in the cleaning tank 20 and from which the coarse object is detached at the coarse object outlet 25 is a cleaning provided outside the cleaning tank 20. Metals and the like that are cleaned by the mechanism 21 and clogged are removed.

  The cleaning mechanism 21 is composed of a brush in which a large number of thin steel wires are fixed to a support portion, and the back surface of the conveyor belt 22c and the brush slide with the movement of the conveyor belt 22c. Kinds are dropped and removed.

  A hopper or chute 11 is provided below the conveyor belt 22c, and a coarse object that has dropped freely from the conveyor belt 22c or a coarse object that has been removed by the cleaning mechanism 21 falls on the hopper or chute 11 and is disposed below it. 7 is transported to the metal recovery unit 10 shown in FIG. 7 together with the coarse material separated at the bulky material outlet 25 by the conveyor device 12 for transporting the coarse material, and metal and glass are collected by the magnetic separator provided in the metal recovery unit 10. It is separated and collected.

  Further, as shown in FIG. 8, by providing a cleaning mechanism 21 above the coarse object outlet 25 and on the downstream side of the driving pulley 22a, the metal or the like clogged in the mesh is removed from the coarse object outlet 25. You may comprise so that it may fall.

  As shown in FIG. 7, the first re-cleaning means 4 for cleaning the fine particles contained in the overflow water that has passed through the draining screen 28 is provided. Details will be described below.

  The overflow water passing through the draining screen 28 is accumulated in the relay tank 40 provided as necessary, the concentration is uniformly stirred by the stirring pump, and the fine ash contained in the overflow water is sent to the thickener as the concentrator 42 by the pump. And concentrated. As the concentrating device 42, a known device such as a wet cyclone, a belt concentrator, or a centrifugal concentrator can be used. In addition, a chemical agent 41 such as a flocculant such as a sulfuric acid band, a pH adjuster, or a chelating agent may be added to the relay tank 40.

  The concentrated fine ash is pulled out from the bottom of the thickener, sent to the relay tank 43, stirred and washed with new washing water supplied from the water supply tank 101, and then dehydrated and washed by the dehydration washing apparatus 44. To be served. In addition, without providing the relay tank 43, the fine ash concentrated by the thickener may be sent directly to the dehydrating and cleaning device 44 and dehydrated while injecting cleaning water. As such a dehydration washing apparatus 44, a filter press, a centrifugal dehydrator, a belt type dehydrator, or the like can be used. The supply amount of the wash water is adjusted according to the salt concentration of the supernatant of the thickener. If the salt concentration is high, the supply amount of the wash water is increased.

  Note that the fine ash may be sent directly from the relay tank 40 to the dehydrating and cleaning device 44 without providing the concentrating device 42.

  The washing waste water from the dehydrating and cleaning device 44 is drained into the relay tank 45 and finally stored in the storage tank 46.

  The storage tank 46 is divided into three chambers by two weirs with different heights, and the waste water overflowing the higher weir is stored in the final storage tank 47 and purified by a water treatment device and discharged outside the system. Is done.

  The cleaning wastewater separated by the concentrating device 42 and the dehydrating and cleaning device 44 and stored in the storage tank 46 is returned to the storage tank 100 via the first circulation path 8 by a pump, and the water supply nozzles 23a, 23b, It is re-supplied to the washing tank 20 through 23c, 23d, 23e, and 20e and used as re-washing water.

  In addition, since the cleaning wastewater separated by the concentrating device 42 has a high concentration of obstacle substances, it is preferentially discharged out of the system. Therefore, it is sent to the storage tank 47 without passing through the storage tank 46, and only when the cleaning water is insufficient. It may be configured to be sent to the storage tank 46 and used as rewash water.

  The salt content of the fine ash is higher than the salt content of the medium ash, and the salt content of the cleaning effluent from the first recleaning means 4 is higher than the cleaning effluent of the second recleaning means 6, It is separated from the second recleaning means 6 and returned to the wet sorting means 2.

  In this way, in the wet sorting device 2 and the first re-cleaning means 4, the cleaning treatment is performed with the cleaning wastewater having a high salt concentration, but a new cleaning is supplied to the dehydration cleaning device 44 through the concentration device 42. The amount of water (rinse water) can be suppressed very slightly.

  The second re-cleaning means 6 classifies the intermediate particles carried out of the tank by the bucket conveyor mechanism 29 into coarse ash and fine ash, and the fine particles classified by the classification device 61. A cleaning device 62 for re-cleaning is provided. The classification device 61 is configured by a wet vibration sieve device, and is supplied by dropping from the bucket conveyor mechanism 29 via the chute 60. Note that a screen device can be used as the classification device 61.

  The chute 60 and the classification device 61 are spray-fed with cleaning wastewater having a low salinity concentration circulated through the second circulation path 9, and new washing water is supplied from the water supply tank 101 on the downstream side of the classification device 61. Is spray-fed and the classified coarse ash is drained as it is and used as a cement raw material. Coarse ash having a large particle size has a small amount of adhering salts, and therefore does not require much washing.

  The cleaning device 62 includes a relay tank 63 that stores fine particles and cleaning wastewater that have passed through the classification device 61, and a wet cyclone as a solid-liquid separator 64 that solid-liquid separates the fine ash that has been stirred and washed again in the relay tank 63. And the washing tank 65 which wash | cleans the fine ash solid-liquid-separated with the wet cyclone is provided.

  Fine ash settled in the ash settling tank is rinsed with new washing water (rinse water) supplied from the water supply tank 101 while being carried out by the ash lifting conveyor 66, and then used as a cement material. . The overflow water in the cleaning tank 65 is circulated and supplied to the relay tank 63.

  The washing wastewater separated by the wet cyclone is circulated and supplied as washing water to the chute 60 and the classification device 61 described above, and after the excess washing wastewater is stored in the storage tank 100, it is supplied as washing water for the wet sorting device 2. The The washing waste water separated by the wet cyclone contains fine ash that has not been sufficiently separated by the wet sorting device 2, and such fine ash passes through the second circulation path 9 and again in the wet sorting device 2. Classified. The solid-liquid separator 64 is not limited to a wet cyclone, and may be configured to separate fine ash and washing wastewater by a known dehydrator, a sedimentation tank, or the like.

  The second circulation path 9 includes a circulation path 91 for returning the cleaning wastewater from the cleaning tank 65 to the relay tank 63 and a circulation path 92 for returning the wastewater of the solid-liquid separator 64 to the classification device 61.

  That is, the granular material processing system according to the present invention is discharged from the first re-cleaning means for re-cleaning the fine particles, the second re-cleaning means for re-cleaning the medium particles, and the first re-cleaning means. Provided with a first circulation path for returning the washed wastewater to the wet sorting device and a second circulation path for returning the washed wastewater discharged from the second rewashing means to the second rewashing means. The washing waste water returned through the route is reused as washing water.

  Therefore, while simplifying the equipment and reducing the amount of water to be washed, coarse substances mixed in the treatment object are washed and removed, and the circulation path of the washing wastewater is separated into two systems, so that water-soluble components are separated from the granular material. And obstructive substances such as heavy metals can be efficiently removed.

  The wet sorting device according to the present invention is soil contaminated with heavy metals, such as illegally dumped landfill soil, etc., and when the soil granular material mixed with coarse materials as described above is recycled as resources It can also be applied to. In this case, according to the present invention, heavy metal contaminants are washed and removed from the earth and sand.

  It is needless to say that the specific configuration of the wet sorting apparatus described above is not limited to the description of the embodiment, and can be appropriately changed and designed within the scope of the effects of the present invention.

The explanatory view which looked at the wet sorter by the present invention from the front Top view of the wet sorting device Explanatory drawing of the main part of the wet sorting device viewed from the side Explanatory drawing of the main part of the washing tank of the wet sorting device Explanatory drawing of the main part of the transfer device of the wet sorting device Explanatory drawing of the main part of the bucket type conveyor device Block explanatory diagram of powder processing system Explanatory drawing of the principal part of the conveying apparatus of the wet sorting apparatus showing another embodiment

1: Powder processing system 2: Wet sorting device 4: First re-cleaning means 6: Second re-cleaning means 8: First circulation path 9: Second circulation path 20: Cleaning tank 22: Conveyor device 22a: Conveyor belts 23a, 23b, 23c, 23d, 23e, 29c: Water supply nozzle 24: Feeder 26: Overflow weir 29: Bucket type conveyor device 30: Pulsation generator 40: Relay tank 42: Concentrator (thickener)
43: Relay tank 44: Dehydration cleaning device 46, 47: Storage tank 61: Classification device 62: Cleaning device 63: Relay tank 64: Solid-liquid separator (wet cyclone)
65: Cleaning tank

Claims (1)

While washing the granular processing object put into the washing tank with washing water that pulsates up and down, it is equipped with a conveyor device that receives coarse heavy objects on the perforated conveyance surface and carries it out of the tank,
The processing object is separated into fine particles and medium particles having a particle size larger than the fine particles due to the difference in settling speed, and the medium particles that have passed through the perforated conveyance surface and settled in the washing tank are carried out of the tank. A wet sorting apparatus configured as
Along with the movement of the conveying surface of the conveyor device, a cleaning mechanism is provided for cleaning the perforated conveying surface outside the cleaning tank ,
The cleaning mechanism is composed of a brush provided with a steel wire, and is arranged so as to slide from above on the back surface of the perforated conveyance surface along with the movement of the perforated conveyance surface, thereby removing clogged holes. A wet sorting apparatus configured such that an object is dropped and removed downward from the perforated conveying surface side .

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