JP2009136846A - Particle treatment system and particle treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a particle treatment system which separates/removes a bulky material mixed in a treatment object and efficiently removes obstructive substances including water soluble components and heavy metals from particles while the amount of washing water is reduced by simplifying equipment. <P>SOLUTION: A wet sorting means 2 which sorts the treatment object into the bulky material and the particles while washing it and classifies the particles into particulates and middle-sized particles having a particle size larger than that of the particulates are provided in the system. The wet sorting means sorts the bulky material into a bulky material having a larger specific gravity and a bulky material having a smaller specific gravity by a difference in specific gravity and classifies the particles into the particulates and the middle-sized particles having a larger particle size by a difference in sedimentation speed. A first washing means 4 for rewashing the particulates, a second washing means 6 for rewashing the middle-sized particles, a first circulation path 8 for returning washing drainage discharged from the first rewashing means to the wet sorting means, and a second circulation path 9 for returning washing drainage discharged from the second rewashing means to the second rewashing means are provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a granular material processing system and a granular material processing method for cleaning a granular processing object mixed with a coarse material and removing an obstacle substance 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 suspended matters having a specific gravity smaller than the ash mixed in the incinerated ash. As described, incinerated ash and soil with various particle size distributions, the contamination concentration of obstacles such as salts and heavy metals varies depending on the particle size, so it is extremely difficult to wash uniformly in the same aquarium. It is.

  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, while separating and removing coarse substances mixed in the object to be processed to remove obstacle substances such as water-soluble components and heavy metals from the granular material. It aims at providing the granular material processing system and granular material processing method which can be removed efficiently.

  In order to achieve the above-mentioned object, the first characteristic configuration of the granular material processing system according to the present invention is a granular processing object mixed with a coarse material as described in claim 1 of the claims. A granular material processing system for removing obstacle substances mixed in the processing object by washing the processing object, sorting the coarse material and the granular material while washing the processing object, and two or more granular materials It is in the point provided with the wet-sorting means for classifying into groups.

  The wet sorting means sorts the processing object into coarse and granular materials while being cleaned, and the granular materials are classified into two or more groups, and a sorting device and a classification device are provided separately. There is no need, and it is possible to efficiently perform selective cleaning while reducing the equipment cost and reducing the amount of cleaning water.

  In the second characteristic configuration, as described in claim 2, in addition to the first characteristic configuration described above, the wet-sorting means is configured such that the coarse product is divided into a coarse product having a large specific gravity and a coarse product having a low specific gravity due to a difference in specific gravity. The fine particles are classified into fine particles and medium particles having a larger particle size than the fine particles according to the difference in sedimentation speed.

  As described in claim 3, the third characteristic configuration includes, in addition to the first or second characteristic configuration described above, a first re-cleaning means for re-cleaning the fine particles, and the intermediate particles. A second rewashing means for rewashing, a first circulation path for returning cleaning wastewater discharged from the first rewashing means to the wet sorting means, and a second rewashing means discharged from the second rewashing means A second circulation path for returning the washing wastewater to the second rewashing means is provided, and the washing wastewater returned through each circulation path is reused as washing water.

  Fine particles with a high content of obstructive substances classified by the wet sorting means are rewashed by the first re-cleaning means, and medium-sized products with less obstructive substance contents than the fine particles are obtained by the second re-cleaning means. Rewashed. At this time, the washing waste water having a high concentration of the obstacle substance discharged from the first rewashing means is returned to the wet sorting means through the first circulation path and reused as washing water, and the second rewashing means Since the cleaning wastewater with a relatively low concentration of obstacle substances discharged from the water is returned to the second rewashing means via the second circulation path and reused as washing water, the obstacle substances in the second circulation path Washing effluent with a relatively low concentration of sewage can be used to wash medium-grained substances with a low content of obstructive substances, and the cleaning effluent can be efficiently reused to enhance the cleaning effect.

  In the fourth feature configuration, as described in claim 4, in addition to the third feature configuration described above, the first re-cleaning means includes a concentrating device for concentrating the fine particles, and a concentrating device. A cleaning and dehydrating device for cleaning and dewatering the concentrated fine particles is provided, and the separated liquid separated by the concentrating device is returned to the wet sorting means through the first circulation path.

  In the fifth feature configuration, as described in claim 5, in addition to the third or fourth feature configuration described above, the second re-cleaning means is configured to change the medium-sized product into a coarse product and a fine product. It is in the point provided with the classifier which classifies into a thing, and the washing | cleaning apparatus which rewashs the classified fine particle thing.

  The fine particles classified by the classifier have a higher content of obstructive substances than the coarse particles, and thus are sufficiently purified by being washed again by the cleaning device.

  In the sixth feature configuration, as described in claim 6, in addition to the fifth feature configuration described above, the cleaning device fixes the fine-particle relay tank and the re-washed fine-grain material. A solid-liquid separator for liquid separation; and a washing tank for washing fine particles separated into solid and liquid, wherein the second circulation path is a circulation path for returning washing waste water from the washing tank to the relay tank; The solid-liquid separator is provided with a circulation path for returning the waste water from the solid-liquid separator to the classification device.

  In the seventh feature configuration, as described in claim 7, in addition to the sixth feature configuration described above, the relay tank and the solid-liquid separator are arranged in series, and the second circulation path Is a circulation path for transferring the waste water of the latter solid-liquid separator to the relay tank immediately before the preceding solid-liquid separator, a circulation path for transferring the waste water of the washing tank to the relay tank immediately before the washing tank, The circulation path for returning the waste water of the eye solid-liquid separator to the classifier is provided.

  According to the first characteristic configuration of the granular material processing method of the present invention, as described in claim 8, an obstacle substance mixed in the processing target by washing the granular processing target mixed with a coarse material It is a granular material processing method to be removed, in which the processing object is sorted into a coarse substance and a granular substance while being washed by a wet sorting step, and the granular substance is classified into two or more groups.

  In the second characteristic configuration, as described in the ninth aspect, in addition to the first characteristic configuration described above, the wet-sorting step is configured such that the coarse product is divided into a coarse product having a large specific gravity and a coarse product having a low specific gravity due to a difference in specific gravity. And a classification step of classifying the granular material into fine particles and medium particles having a particle size larger than the fine particles by the difference in settling speed.

  In addition to the first or second characteristic configuration described above, the third characteristic configuration includes a first re-cleaning step for re-cleaning the fine particles, and The second re-washing process to be re-washed and the cleaning waste water discharged in the first re-washing process are returned as washing water in the wet sorting process, and the washing waste water discharged in the second re-washing process Is returned as cleaning water in the second re-cleaning step, and each cleaning wastewater is reused as cleaning water.

  As described above, according to the present invention, while simplifying the equipment and reducing the amount of washing water, coarse substances mixed in the object to be treated are separated and removed from the granular material to obstruct substances such as water-soluble components and heavy metals. It has become possible to provide a granular material processing system and a granular material processing method that can efficiently remove the particle.

  Hereinafter, a granular material processing system and a granular material processing method for cleaning a granular processing object mixed with a coarse material and removing an obstacle substance mixed in the processing object will be described with reference to the drawings. Here, a case will be described in which incineration ash mixed with coarse materials such as metals, glass (stones, glass pieces, etc.) and organic materials (rubber, plastic, paper, fiber, wood pieces, etc.) is used as the object to be treated.

  The incinerated ash has a different chlorine content depending on the particle size, and the smaller the particle size, the larger the chlorine content. In the present granular material processing system, coarse particles having a particle size of 2 mm or more based on the chlorine content (hereinafter, “ ), Fine particles having a particle size of 0.15 mm to 2 mm (hereinafter also referred to as “fine ash”), and fine particles having a diameter smaller than 0.15 mm (hereinafter, “fine ash”). Dechlorination treatment is performed efficiently by changing the cleaning conditions in each of the above.

  As shown in FIG. 4, 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. Wet-sorting means 2 for classifying into two, first re-washing means 4 for re-washing the fine particles classified by the wet-sorting means 2, and second-washing for the medium-grained substances classified by the wet sorting means 2 A re-cleaning means 6 is provided.

  Further, the first waste water discharged from the first re-cleaning means 4 is returned to the wet sorting means 2 and the waste water 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 means 2 includes a washing water tank 20 having a rectangular shape in plan view that is filled with washing water and has an inclined bottom part, and one upper opening communicates with the washing water tank 20, and the other opening A U-shaped pulsating washing tank 21 provided with a pulsation generating device 30 and one opening of the pulsating washing tank 21 and an inclined bottom part of the washing water tank 20 are arranged and rotated and supported by pulleys 22a, 22b and 22c. A plurality of conveyor belts 22 each having a mesh-like transport surface, and water jet nozzles 23a and 23b that are provided in plural along the rotation direction of the conveyor belt 22 and form a water flow in a direction opposite to the rotation direction of the conveyor belt 22. , 23c, and 23d.

  The pulsation generator 30 includes an eccentric sheave 33 connected to move the plunger 31 up and down from the vicinity of the water surface of the other opening of the pulsation washing tank 21 via a bellows 37 and a rod 32, and the rotational shaft of the eccentric sheave 33 is provided. A motor 34 that rotates is provided.

  The rotation speed of the motor 34 is adjusted by the inverter device, and the bellows 37 is expanded and contracted with the rotation of the motor 34, whereby the water in the cleaning water tank 20 pulsates in the vertical direction via the pulsating cleaning tank 21.

  The pulsation generator 30 includes a stroke length adjustment mechanism (not shown) that adjusts the stroke length of the plunger 31 that moves up and down, and can change the height of the pulsating liquid surface.

  As the stroke length adjusting mechanism, a mechanism for adjusting the attachment position of the plunger 31 in the vertical direction, a mechanism for adjusting the length of the rod 32, and a mechanism for adjusting the position of the rod 32 attached to the eccentric sheave 33 in the diametrical direction are used. Can do.

  The pulsation washing tank 21 is divided into three along the extending direction of the conveyor belt 22, and eccentric sheaves 33 to which the rotating shafts 35 are attached at different eccentric positions are arranged, and pulsations with different phases are applied.

  The processing object conveyed to the wet sorting means 2 by the belt conveyor device 36 is put into the washing water tank 20 by the vibration feeder 24, dispersed by the vertical pulsation of the washing water by the pulsation washing tank 21, and mixed into the ash. Among the coarse materials, metals and glass having large specific gravity (such as stones and glass pieces) are discharged from the coarse material outlet 25 by the conveyor belt 22 after the ash adhering to the washing water is removed, and organic materials having a small specific gravity ( Rubber, plastic, paper, fiber, wood chips, etc.) float on the water surface and flow out from the overflow weir 26 to the drainage basin 27 according to the water flow by the water injection nozzles 23a, 23b, 23c, 23d. That is, in the wet sorting means 2, a specific gravity sorting step is performed in which the coarse product is sorted into a coarse product having a large specific gravity and a coarse product having a low specific gravity by the specific gravity difference.

  The ash charged into the washing water tank 20 is dispersed by the pulsation in the vertical direction of the washing water in the pulsating washing tank 21, and the medium ash (coarse ash having a large sedimentation speed and settled against the upward pulsating flow. And fine ash) settle in the water tank, and the fine ash having a low settling velocity floats in the washing water according to the water flow by the water injection nozzles 23a, 23b, 23c, and 23d and flows out from the overflow weir 26 to the drainage basin 27. That is, in the wet sorting means 2, a classification step is performed in which the ash that is a granular material is classified into fine ash and medium ash having a larger particle diameter than the fine ash due to a difference in sedimentation speed.

  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. That is, as shown to Fig.5 (a), a granular material processing system classifies a granular material into two or more groups while classifying into a coarse thing and a granular material, wash | cleaning a process target object. In addition, as shown in FIG. 5B, the wet sorting means sorts the coarse product into a coarse product with a large specific gravity and a coarse product with a low specific gravity by the specific gravity difference, and the fine particles and fine particles are separated by the sedimentation speed difference. Classification into medium particles having a particle size larger than that of the particles.

  Metals and glass discharged from the bulky material outlet 25 are separated and recovered by the metal recovery unit 10 such as a magnetic separator, and the overflow water flowing into the drainage basin 27 is discharged by the draining screen 28. After the organic material is removed, it is sent to the first re-cleaning means 4 together with the fine ash. At this time, the organic material may be washed by spraying washing water on the draining screen 28 part.

  A plurality of buckets 29a having a plurality of small-diameter openings formed side by side or at the bottom are arranged side by side along an endless track in the middle ash that has settled from the opening formed at the bottom of the pulsating washing tank 21 to the bottom of the washing water tank 20. 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.

  In the first re-cleaning means 4, the overflow water that has passed through the draining screen 28 is accumulated in a relay tank 40 provided as necessary, the concentration is uniformly stirred by a stirring pump, and the fine ash contained in the overflow water is It is sent to a thickener as the concentrating device 42 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 washing waste water separated by the concentrating device 42 and the dehydrating washing device 44 and stored in the storage tank 46 is returned to the wet sorting means 2 through the first circulation path 8 by the pump, and the water injection nozzles 23a, 23b, 23c, 23d. Is used as re-cleaning water in the cleaning water tank 20.

  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.

  In addition, the water injection provided in the lower part of the plunger 31 of the pulsation washing tank 21 separately from the route which supplies the rewash water supplied from the 1st circulation path 8 via the water injection nozzles 23a, 23b, 23c, and 23d. Routes supplied from the unit 21a may be provided, and the supply ratio of rewash water through each route may be adjusted. By adjusting the ratio supplied from the water injection section 21a and adjusting the speed of the upward flow in the pulsation washing tank 21, the particle size to be classified can be set by controlling the sedimentation speed of the powder.

  The salt content of the fine ash is higher than the salt content of the midstream ash, and the salt content of the cleaning waste water from the first re-cleaning means 4 is higher than that of the second re-cleaning means 6; The second re-cleaning means 6 is separated and returned to the wet sorting means 2.

  In this way, in the wet sorting means 2 and the first re-cleaning means 4, the cleaning treatment is performed with the cleaning wastewater having a high salt concentration, but the new cleaning 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 medium ash 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 to the chute 60 and the classifier 61 as washing water, and after the excess washing wastewater is stored in the storage tank 100, it is supplied as washing water for the wet sorting means 2. The The washing waste water separated by the wet cyclone contains fine ash that has not been sufficiently separated by the wet sorting means 2, and such fine ash passes through the second circulation path 9 and again by the wet sorting means 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 includes, as shown in FIG. 5C, a first re-cleaning unit that re-cleans the fine particles, and a second re-cleaning unit that re-cleans the medium particles. A first circulation path for returning cleaning wastewater discharged from the first recleaning means to the wet sorting means; and a first circulation path for returning cleaning wastewater discharged from the second recleaning means to the second recleaning means. Two circulation paths are provided, and the washing wastewater returned through each circulation path is reused as washing water.

  Further, as shown in FIG. 5 (d), the first re-cleaning means includes a concentrating device for concentrating the fine particles, and a washing and dehydrating device for washing and dewatering the fine particles concentrated by the concentrating device. The separated separated liquid is returned to the wet sorting means through the first circulation path.

  Furthermore, as shown to Fig.6 (a), a 2nd re-washing means is a classifier which classify | categorizes a medium grain thing into a coarse grain thing and a fine grain thing, and a washing apparatus which rewashs the classified fine grain substance It has.

  Moreover, as shown in FIG.6 (b), the washing | cleaning apparatus is a relay tank of a fine particle thing, the solid-liquid separator which carries out solid-liquid separation of the re-washed fine particle, and the fine particle by which solid-liquid separation was carried out The second circulation path has a circulation path for returning the washing waste water from the washing tank to the relay tank, and a circulation path for returning the waste water of the solid-liquid separator to the classification device. .

  In the present embodiment, the case where the relay tank 63 and the solid-liquid separator 64 are configured in one stage is shown, but the relay tank 63 and the solid-liquid separator are arranged in a plurality of stages in two or more stages. In this case, as shown in FIG. 7, the second circulation path includes a circulation path for transferring the waste water of the subsequent solid-liquid separator to the relay tank immediately before the solid-liquid separator, and a washing tank. It is preferable to provide a circulation path for transferring the waste water to the relay tank immediately before the washing tank and a circulation path for returning the waste water of the first-stage solid-liquid separator to the classifier.

  As described above, in the granular material processing system according to the present invention, in order to clean the granular processing object mixed with the coarse material and remove the obstacle substance mixed in the processing object, the wet particle sorting process is performed. While washing the target object, a coarse particle and a granular material are sorted and a granular material processing method is performed in which the granular material is classified into two or more groups. A specific gravity selection step for selecting a large coarse product and a coarse product with a low specific gravity, and a classification step for classifying the granular material into fine particles and medium particles having a larger particle diameter than the fine particles by the difference in settling speed are executed.

In addition, the first re-cleaning step for re-washing the fine particles, the second re-washing step for re-washing the medium-sized particles, and the washing wastewater discharged in the first re-washing step are used as washing water for the wet sorting step. In addition, the cleaning wastewater discharged in the second rewashing process is returned as cleaning water in the second rewashing process, and each cleaning wastewater is reused as cleaning water.

  A part of the rewash water in the second rewash process is returned to the wet sorting process, and is effectively used as the rewash water in the first rewash process. 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.

  In the embodiment described above, the powder processing system and the powder processing system have been described in which incinerated ash mixed with coarse materials such as metals, glass, and organic materials is treated, but according to the present invention. The target object of the granular material processing system and the granular material processing system is not limited to incinerated ash, but is soil that has been polluted by heavy metals, such as landfilled soil illegally dumped. It can also be applied to the case where soil particles mixed with soil are recycled as resources. In this case, according to the present invention, heavy metal contaminants are washed and removed from the earth and sand.

  Further, in the above-described embodiment, the wet sorting means is configured by the jig sorting apparatus. However, the wet sorting means is not limited to such a wet sorting means, and the wet sorting means as shown in FIGS. There may be.

  More specifically, the wet-sorting means uses a bar screen 73 arranged to extend the washing water tank 7 in which the mesh conveyor 72 is arranged along the inclined wall surface 71 from the lower end of the mesh conveyor 72 in the vertical direction. The region is divided into a sorting tank 7a on the right side and a classification tank 7b on the left side of the drawing.

  The sorting tank 7a sorts and discharges a coarse article having a large specific gravity out of the tank to be processed from the upper side of the mesh conveyor 72 by the mesh conveyor 72, and a coarse article having a small specific gravity captured by the bar screen 73. A scraping rake 76 that lifts and discharges outside the tank is sorted and discharged out of the tank by a scraping device 75 arranged along an endless track.

  The rake 76 is attached to the chain 75b via a support attached to the link plate of the endless chain 75b wound around the sprocket 75a, and the end of the rake 76 passes through the opening of the bar screen 73. It is configured to extend and scrape coarse materials having a small specific gravity such as rubber and resin.

  Above the mesh conveyor 72, a mesh screen 74 is disposed so as to protrude from the water surface so that coarse objects having a small specific gravity are not discharged by the mesh conveyor 72.

  The mesh conveyor 72 is provided with an aeration nozzle 77 that diffuses from the back surface toward the transport surface, and the granular material of the input processing target is washed while being stirred to such an extent that it does not settle due to the aeration. . By such a diffuser, the upper layer of the cleaning water filled in the cleaning water tank 7 is adjusted so that the water flows from the right side to the left side of the drawing.

  The granular material that has passed through the bar screen 73 is classified into fine particles and medium particles in the classification tank 7b. That is, the fine particles having a low sedimentation speed are discharged from the overflow portion 79 together with the supernatant water, and the medium particles having a high sedimentation speed are settled and discharged from the drawing portion 78 provided at the bottom of the washing water tank 7.

  Washing water is supplied to the coarse material selected from above the mesh conveyor 72 and the scraping device 75 to be washed, and the overflowing washing water is additionally supplied from the overflow portion 79.

  By such wet sorting means, a coarse product is sorted into a coarse product with a large specific gravity and a coarse product with a low specific gravity due to a difference in specific gravity, and a granular product with a larger particle size than a fine product and a fine product with a difference in sedimentation speed. And will be classified.

  Specific configurations of the wet sorting means, the first recleaning means, the second recleaning means, and the like, which are components of the granular material processing system described above, are not limited to the description of the embodiment, and the present invention. Needless to say, the design can be changed as appropriate within the range where the effects of the above are achieved.

Explanatory drawing of the wet selection means used for the granular material processing system by this invention Top view of the wet sorting means Explanatory drawing of the main part of the wet sorting means Explanatory drawing of the granular material processing system by this invention Block explanatory drawing of the granular material processing system by this invention Block explanatory drawing of the granular material processing system by this invention Block explanatory drawing of the granular material processing system by this invention Explanatory drawing of the wet-sorting means of another embodiment Explanatory drawing of the principal part of the wet-sorting means of another embodiment

Explanation of symbols

1: Granule treatment system 2: Wet sorting means 4: First recleaning means 6: Second recleaning means 8: First circulation path 9: Second circulation path 20: Washing water tank 21: Pulsating washing Tank 22: Conveyor belts 23a, 23b, 23c, 23d: Water injection nozzle 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 (10)

  A granular material processing system for cleaning a granular processing object mixed with a coarse material and removing an obstacle substance mixed in the processing object, wherein the coarse material and the granular material are washed while cleaning the processing object. And a wet particle sorting means for sorting the powder particles into two or more groups.   The wet sorting means sorts a coarse product into a coarse product with a large specific gravity and a coarse product with a low specific gravity by a specific gravity difference, and converts the granular material into a fine product and a medium product having a larger particle size than the fine product through a settling speed difference. 2. The granular material processing system according to claim 1, wherein classification is performed.   First re-cleaning means for re-cleaning the fine particles, second re-cleaning means for re-cleaning the medium particles, and cleaning wastewater discharged from the first re-cleaning means to the wet sorting means A first circulation path to be returned, and a second circulation path to return the cleaning waste water discharged from the second re-cleaning means to the second re-cleaning means, and are returned through the respective circulation paths. 3. The granular material processing system according to claim 1, wherein the washed waste water is reused as washing water.   The first re-washing means includes a concentrating device for concentrating the fine particles, and a washing and dehydrating device for washing and dehydrating the fine particles concentrated by the concentrating device, and the separation liquid separated by the concentrating device 4. The granular material processing system according to claim 3, wherein the powder is returned to the wet sorting means through one circulation path.   The second re-cleaning means includes a classification device that classifies the medium particles into coarse particles and fine particles, and a cleaning device that re-cleans the classified fine particles. Item 5. A granular material processing system according to Item 3 or 4.   The cleaning apparatus includes a relay tank for the fine particles, a solid-liquid separator for solid-liquid separation of the re-washed fine particles, and a cleaning tank for cleaning the fine particles separated into solid and liquid, The second circulation path includes a circulation path for returning cleaning wastewater from the cleaning tank to the relay tank, and a circulation path for returning wastewater of the solid-liquid separator to the classification device. Item 6. The granular material processing system according to Item 5.   The relay tank and the solid-liquid separator are arranged in a plurality of stages in series, and the second circulation path is a circulation path for transferring the waste water of the subsequent solid-liquid separator to the relay tank immediately before the previous solid-liquid separator; And a circulation path for transferring waste water from the washing tank to a relay tank immediately before the washing tank, and a circulation path for returning waste water from the first-stage solid-liquid separator to the classification device. Item 7. The granular material processing system according to Item 6.   A method for treating a granular material in which a granular processing object mixed with a coarse substance is washed to remove an obstacle substance mixed in the processing object, and the coarse object is washed while washing the processing object by a wet sorting step. And a granular material, and the granular material is classified into two or more groups.   The wet sorting process includes a specific gravity sorting process for sorting a coarse product into a coarse product with a large specific gravity and a coarse product with a low specific gravity by a specific gravity difference, and a fine particle and a finer particle having a particle size larger than that of a fine product through a difference in sedimentation speed. The method for treating a granular material according to claim 8, further comprising a classification step of classifying the granular material.   A first re-washing step for re-washing the fine particles, a second re-washing step for re-washing the medium-sized materials, and the washing waste water discharged in the first re-washing step in the wet sorting step. Returning as washing water, returning the washing wastewater discharged in the second rewashing step as washing water in the second rewashing step, and reusing each washing wastewater as washing water The granular material processing method according to claim 8 or 9.

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