JP2010234216A - Powdery particle material treatment system, and powdery particle material treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a powdery particle material treatment system capable of efficiently removing an obstruction substance such as a water soluble component or heavy metals from a powdery particle material while suppressing the foaming of washing wastewater and simplifying equipment to reduce the amount of washing water. <P>SOLUTION: The powdery particle material treatment system is equipped with a wet sorting means 2 for sorting the powder particle material into a fine particle material and a medium particle material, a fine particle material separating means 4 for subjecting the fine particle material and washing wastewater, which are discharged from the wet sorting means 2, to solid-liquid separation treatment, a first circulating route 3 for returning the washing wastewater subjected to the solid-liquid treatment by the fine particle material separating means 4 to the wet sorting means 2, a second circulating route 7 for returning the washing wastewater, which is discharged from a rewashing means 5 for rewashing the medium particle material sorted by the wet sorting means 2, to the rewashing means 5, a novel water supplying route 8 for supplying novel water to the rewashing means 5 and a washing wastewater supplying route 9 for supplying a part of the washing wastewater discharged from the rewashing means 5 to the first circulating route 3 as washing water and the fine particle material separating means 4 is constituted of a filtering type solid-liquid separation means. <P>COPYRIGHT: (C)2011,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 reclaiming and reusing powder particles such as incineration ash and soil, it is necessary to remove various water-soluble components and heavy metals and other obstacles that impede resource recycling.

  For example, when purifying and reusing contaminated soil where 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.

  Incineration ash, such as incineration main ash and fly ash, is generally landfilled at the final disposal site, or disposed of in a melting furnace at a high temperature and then reduced to chemically stable slag. In view of problems such as saturation of the capacity of the final disposal site, it is considered to be reused as a raw material for cement.

  In general, when incineration residues such as incineration ash generated in municipal waste incineration facilities are reused as raw materials for cement, it is first necessary to separate and remove coarse materials such as metals, glass, and organic materials from the incineration residues. .

  Furthermore, when the incineration ash is preheated with a preheating device and then baked in a rotary kiln, etc., there is a problem that the device is corroded by the chlorine component contained in the incineration ash, so the incineration ash is washed with water beforehand to remove chlorine. There is a need to.

  In addition, when incinerated ash is used as a raw material for ordinary Portland cement, which accounts for about 70% of domestic cement consumption, it is necessary to remove chlorine in order to prevent corrosion of reinforcing bars in concrete.

  Patent Document 1 discloses a recovery process for recovering incineration ash discharged from a municipal waste incinerator into separate receiving tanks for main ash and fly ash, pulverizing the main ash in the main ash receiving tank of the recovery process, A pulverization step for obtaining pulverized particles having a diameter of 200 μm or less, a dedioxin step for decomposing dioxins by treating fly ash in a fly ash receiving tank in the recovery step at a temperature of 300 to 450 ° C. in a reducing atmosphere, and There has been proposed a method for treating incinerated ash that includes a washing step in which the main ash obtained from the pulverization step and the fly ash obtained from the dedioxin step are washed with water and the solid content with reduced chlorine components is recovered.

  However, the method described in Patent Document 1 has a problem that the efficiency is poor because the main ash obtained from the pulverization step and the fly ash obtained from the dedioxin step are mixed and simultaneously washed with water.

  Therefore, the applicant previously described in Patent Document 2, while sorting the incinerated main ash that is the object to be treated, into coarse and fine particles, and the particle size of the fine particles is smaller than that of the fine particles and fine particles. A wet sorting means for classifying into large medium particles, a first re-washing means for re-washing the fine particles classified by the wet sorting means, and a second for re-washing the medium particles classified by the wet sorting means A first circulation path for returning cleaning wastewater discharged from the first recleaning means to the wet sorting means; and cleaning wastewater discharged from the second rewashing means to the second Proposed incineration ash treatment equipment that has a second circulation path to return to the re-cleaning means, and reuses the washing wastewater returned through each circulation path as washing water.

  In the incineration ash treatment facility, the chlorine content varies greatly depending on the particle size of the incinerated main ash, so that the coarse ash having a particle size of 2 mm or more and the particle size of 0.15 mm to 2 mm based on the chlorine content. The fine ash and fine ash having a diameter smaller than 0.15 mm are classified, and the cleaning process is performed by changing the cleaning conditions.

JP 2003-103232 A JP 2008-264768 A

  However, as described in Patent Document 2, a thickener, a wet cyclone, a belt concentrator, a centrifugal concentrator, etc. are arranged as a concentrating device in a path for processing fine ash having a particle size smaller than 0.15 mm, In the configuration where fine ash discharged from the wet sorting means and washing waste water are supplied to the concentrator, the fine ash is concentrated and extracted from the bottom, and the supernatant liquid is reused as washing water. There was a risk that the ash would become compact and it would be difficult to pull out the fine ash by the pump, or the pump could break down.

  In addition, suspended solids and fine ash that are not concentrated by the thickener and are suspended in the supernatant liquid are returned to the wet sorting means again through the first circulation path, so the content of fine ash in the washing wastewater increases and foaming occurs. Or a mousse-like scum is generated and overflows, requiring complicated cleaning work, which may make it difficult to smoothly operate the processing equipment.

  In view of the above-described problems, the present invention efficiently removes obstacle substances such as water-soluble components and heavy metals from the granular material while suppressing the foaming of cleaning wastewater and simplifying equipment and reducing the amount of cleaning water. An object of the present invention is to provide a granular material processing system and a granular material processing method that can be used.

  In order to achieve the above-mentioned object, the first characteristic configuration of the granular material processing system according to the present invention is, as described in claim 1 of the claims, fine particles and fine particles while washing the granular material. Solid-liquid separation by the fine-particle separation means for classifying the fine particles discharged from the wet-classification means and the washing wastewater into solid-liquid separation, and the fine-particle separation means A first circulation path for returning the washed waste water to the wet sorting means as washing water, a rewashing means for rewashing the medium-sized matter classified by the wet sorting means, and a discharge from the rewashing means A second circulation path for returning the washing wastewater to the rewashing means as washing water, a new water supply path for supplying new water to the rewashing means, and a part of the washing wastewater discharged from the rewashing means. And supply to the first circulation path as washing water That comprises a washing water discharge supply path, said fines separation means, in that it is constituted by a filtration type solid-liquid separation means.

  When cleaning the processing object having a different obstacle content depending on the particle size, the wet sorting means has a particle size higher than that of the fine particle and the fine particle having a high obstacle substance content while the processing object is being cleaned. It is classified into medium particles with a large content of obstructive substances.

  Fine particles with a high content of obstruction substances are solid-liquid separated from the washing waste water by the fine particle separation means, and the washing waste water with a high content of obstruction substances discharged from the fine particle separation means is passed through the first circulation path. Returned to the wet sorting means and reused as cleaning water.

  The medium particles having a lower obstacle content than the fine particles are rewashed by the rewashing means, and the washing wastewater having a lower obstacle content discharged from the rewashing means is passed through the second circulation path. Returned to the re-cleaning means as cleaning water. Since new water is supplied to the re-cleaning means through the new water supply path, the content of obstructive substances in the cleaning wastewater is further reduced.

  In this way, a part of the washing waste water whose content of the obstacle substance is reduced is supplied to the first circulation path through the washing water supply path, and is returned to the wet sorting means by the first circulation path. The cleaning wastewater is diluted and the content of obstructive substances decreases, and the cleaning wastewater with reduced content of obstructive substances is reused as cleaning water by the wet sorting means, so that the cleaning effect can be improved efficiently. it can.

  However, if there is a large amount of fine particles floating in the washing wastewater discharged from the wet sorting means, the washing wastewater tends to foam, and a lot of mousse-like scum is generated and overflows from each processing means. There is a risk that a complicated cleaning operation becomes necessary, and the granular material processing system cannot be operated smoothly.

  Therefore, by configuring the fine particle separation means with a filtration-type solid-liquid separation means, fine particles floating in the washing waste water can be collected and foaming can be suppressed. Further, by adopting the filtration type fine particle separation means, a pump for extracting the concentrate necessary for the concentrating device such as thickener becomes unnecessary, so that there is no possibility of failure of the pump.

  When the waste water discharged from the re-cleaning means that cleans the medium-grained material is rarely mixed with fine particles, but the fine-grained material adheres to the medium-sized material that has not been sufficiently cleaned by the wet sorting means. However, the cleaning waste water discharged from the re-cleaning means is supplied to the first circulation path by the cleaning waste water supply path, and the fine particles in the cleaning waste water can be recovered by the filtration type solid-liquid separation means. Therefore, foaming of the washing waste water can be suppressed over the entire granular material processing system, generation of mousse-like scum can be suppressed, and smooth operation becomes possible.

  As described in claim 2, the second characteristic configuration is that, in addition to the first characteristic configuration described above, the filtration-type solid-liquid separation means is a filter press dehydrator.

  When fine particles and washing wastewater are separated into solid and liquid by the filter press dehydrator, a lot of suspended solids are separated from the washing wastewater together with the fine particles, so the washing wastewater discharged from the filter press dehydrator is foamed. The amount of fine particles and suspended matters that cause the problem is extremely reduced, and the content of fine particles is reduced in the washing wastewater returned to the wet sorting means by the first circulation path, and the risk of foaming is reduced.

  The filter press dewatering machine has good work efficiency because the solid-liquid separation target can be quickly separated into solid-liquid from the fine-grained material and the washing waste water when the pressure difference between the membranes is low like the fine-grained material.

  Furthermore, since the filter press dehydrator does not require a means for concentrating fine particles, which is an object of solid-liquid separation before solid-liquid separation, such as a centrifugal dehydrator, the facilities can be simplified.

  In the third feature configuration, as described in the third aspect, in addition to the first or second feature configuration described above, the washing in which the fine particle separation means separates the first circulation path into the first circulation path. A first storage tank for storing waste water is provided, and a second storage tank for storing the cleaning waste water discharged from the re-cleaning means is provided in the second circulation path, and the cleaning waste water supply path is It exists in the point comprised so that washing | cleaning waste_water | drain overflows from said 2nd storage tank to said 1st storage tank.

  Washing solid-liquid separated from the second storage tank for storing the washing wastewater discharged from the rewashing means provided in the second circulation path by the fine particle separation means provided in the first circulation path. A configuration in which cleaning wastewater is supplied to the first storage tank for storing wastewater by a pump or a control valve in the path for adjusting the flow rate is conceivable. There is a problem that the cost becomes high.

  Furthermore, there is a possibility that the fine particles adhere to the medium particles that have not been sufficiently cleaned by the wet sorting means, the fine particles are mixed into the second circulation path, and foam to cause malfunction of the control valve. .

  Therefore, by configuring the washing waste water to overflow from the second storage tank to the first storage tank, it is possible to reduce the risk of power sources such as pumps and control valves, and malfunction of the control valves, An appropriate amount can be supplied stably.

  The first characteristic configuration of the granular material processing method according to the present invention is, as described in claim 4, wet classification that classifies fine particles and medium particles having a larger particle diameter than fine particles while washing the granular materials. And a fine particle separation step for solid-liquid separation of the fine particles discharged from the wet sorting step and the washing waste water, and the washing waste water separated in the solid-liquid separation in the fine particle separation step is returned to the wet sorting step as washing water The first circulation step, the re-washing step for re-washing the intermediate particles classified in the wet sorting step, and the washing waste water discharged from the re-washing step returned to the re-washing step as washing water A second circulation step, a new water supply step for supplying new water to the re-washing step, and a washing for supplying a part of the washing drainage discharged from the re-washing step to the first circulation step as washing water A waste water supply step, wherein the fine particle separation means comprises: In that it is constituted by over-expression of the solid-liquid separation step.

  In the second feature configuration, in addition to the first feature configuration described above, the filtration type solid-liquid separation step is configured by a filter press type solid-liquid separation step. In the point.

  As described above, according to the present invention, while suppressing foaming of cleaning wastewater, while simplifying equipment and reducing the amount of cleaning water, it is possible to efficiently remove obstacle substances such as water-soluble components and heavy metals from the granular material. It has become possible to provide a granular material processing system and a granular material processing method that can be removed.

Explanatory drawing of the granular material processing system by this invention 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 Block explanatory drawing of the granular material processing system by this invention (A) The top view of each tank by another embodiment, (b) The partial side view of each tank by another embodiment, (c) The partial side view of each tank by another embodiment

  Below, the granular material processing system and the granular material processing method which can remove effectively obstructive substances, such as a water-soluble component and a heavy metal, from a granular material are demonstrated based on drawing. Here, incinerated ash as a granular material mixed with coarse materials such as metals, glass (stones, glass pieces, etc.) and organic materials (rubber, plastic, paper, fiber, wood pieces, etc.) is treated. Explain the case.

  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, fine particles having a particle diameter smaller than 0.15 mm (hereinafter also referred to as “fine ash”) and medium particles having a particle diameter of 0.15 mm or more (hereinafter, “ The medium particles are classified into fine particles having a particle size of 0.15 mm to 2 mm (hereinafter also referred to as “fine particle ash”), and coarse particles having a particle size of 2 mm or more (hereinafter also referred to as “medium ash”). Hereinafter, it is also classified as “coarse ash”), and the dechlorination treatment is efficiently performed by changing the cleaning conditions in each.

  As shown in FIG. 1, the granular material processing system 1 selects a coarse object and a granular material while cleaning the processing object discharged from the incinerator, and cleans the granular material while cleaning the granular material. The wet sorting means 2 for classifying into a medium grain having a particle size larger than that of the fine particles, the fine substance separating means 4 for separating the fine particles discharged from the wet sorting means 2 and the washing wastewater into solid and liquid, and the fine particle separating means 4 A first circulation path 3 for returning the washed waste water separated into solid and liquid to the wet sorting means 2 as washing water, a rewashing means 5 for rewashing the medium-sized matter classified by the wet sorting means 2, and a rewashing means 5, a second circulation path 7 for returning the cleaning wastewater discharged from the cleaning water 5 to the recleaning means 5, a new water supply path 8 for supplying new water to the recleaning means 5, and a discharge from the recleaning means 5 A part of the washed waste water is supplied to the first circulation path 3 as washing water. And a drainage supply path 9.

  As shown in FIG. 2 to FIG. 4, the wet sorting means 2 includes a washing water tank 20 having a slanted bottom for storing washing water, one upper opening communicating with the washing water tank 20, and a pulsation generator 30 at the other opening. A U-shaped pulsating washing tank 21 provided with a mesh, and a mesh-like shape disposed along one opening of the pulsating washing tank 21 and the inclined bottom of the washing water tank 20 and rotatably supported by pulleys 22a, 22b, and 22c. A plurality of conveyor belts 22 having a conveying surface, and a plurality of water jet nozzles 23a, 23b, 23c, and 23d that are provided 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. It is comprised with the jig sorter provided with etc.

  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 object to be processed conveyed to the wet sorting means 2 by the belt conveyor device 36 is directly dropped into the washing water tank 20 through the charging chute 24 provided with the inclined surface 24a for preventing it from being dropped and damaged on the conveyor belt 22. It is thrown. In the charging chute 24, there are provided a cleaning nozzle 24b for washing away the processing object dropped on the inclined surface 24a and a washing nozzle 24c for washing off the processing object remaining on the belt conveyor device 36.

  The object to be treated that has fallen on the conveyor belt 22 is dispersed by the pulsation in the vertical direction of the washing water in the pulsation washing tank 21, and among the coarse objects mixed in the incineration ash, metals or glass having a high specific gravity (stone or glass) And the like are discharged from the bulky material outlet 25 by the conveyor belt 22 after the ash adhering to the washing water is removed.

  Further, behind the pulley 22c, there is provided a rotating brush 25a for removing coarse substances clogged and adhering to the conveyor belt 22. The rotating brush 25a is configured to slide by the rotation of the conveyor belt 22.

  As described above, since the coarse material is reliably removed from the conveyor belt 22 by the rotating brush 25a and can be discharged from the coarse material discharge port 25, the attached coarse material is prevented from growing and increasing the load on driving the belt conveyor 22. In addition, it is possible to prevent the need for a chute to be collected when a coarse material adhering to the conveyor belt 22 is detached in the washing water tank 20 or mixing with a medium particle. Instead of the rotating brush, the brush may be pressed against the conveyor belt 22 and fixed.

  An organic material (rubber, plastic, paper, fiber, wood piece, etc.) having a small specific gravity floats on the water surface and flows out from the overflow weir 26 to the drainage basin 27 together with the washing water according to the water flow by the water injection nozzles 23a, 23b, 23c, 23d. .

  That is, the wet sorting means 2 executes a specific gravity sorting step 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 based on the difference in specific gravity.

  Further, the incinerated ash charged into the washing water tank 20 is dispersed by the vertical pulsation of the washing water in the pulsating washing tank 21, and the sedimentation speed is large and the medium ash (coarse grain) that settles against the upward pulsating flow. Ash and fine ash) settle in the water tank, and the fine ash having a low sedimentation 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 wet sorting step is performed in which the incinerated ash which is a granular material is classified into fine ash and medium ash having a larger particle size than the fine ash due to a difference in sedimentation speed.

  That is, in the course of the wet sorting process as described above, obstructive substances such as chlorine adhering to coarse substances and incineration ash are washed away to some extent.

  Metals and galley discharged from the bulky material outlet 25 are separated and collected by the metal recovery unit 10 such as a magnetic separator into metals and galley, and the washing wastewater overflowing the drainage basin 27 is collected by the screen device. After the organic material is removed by 28, it is sent to the fine particle separation means 4 together with the fine ash. At this time, in the screen device 28, the organic material may be washed by spraying washing water.

  The medium ash that has settled down from the opening formed in the bottom of the pulsating washing tank 21 to the bottom of the washing water tank 20 includes a plurality of buckets 29a in which a plurality of small-diameter drain holes are formed on the side and bottom along the endless track. It is carried out of the tank while drained by the bucket conveyor mechanism 29, and further cleaned by the re-cleaning means 5.

  The diameter of the drain hole generated in the bucket 29a may be the same as or different from the side and the bottom. For example, you may form the diameter of the drain hole produced | generated in a side part larger than the diameter of the drain hole produced | generated in a bottom part. Moreover, you may vary the diameter of the drain hole produced | generated in a side part by the upper part of a side part, and the downward direction.

  For example, if a drain hole having a diameter of 15 mm is formed above the side portion and a drain hole having a diameter of 5 mm is formed below and on the bottom portion, the medium ash accumulated in the bucket 29a is removed from the drain hole. When the bucket 29a tilts along the endless track of the bucket conveyor mechanism 29 without flowing, the washing wastewater in the bucket 29a is efficiently discharged from the upper drain hole.

  In other words, a drainage hole of an appropriate size that can prevent the washing water having a high chlorine concentration in the wet sorting means 2 accumulated in the bucket 29a from flowing into the re-washing means 5 for the medium particles is formed. preferable.

  The fine particle separation means 4 is composed of a filter press dehydrator 41 as a filtration-type solid-liquid separation means, and the washing waste water containing fine ash that has passed through the screen device 28 is stored in the dehydrator adjustment tank 40 and is concentrated by a stirrer. Is uniformly stirred and driven into the filter press dehydrator 41 by the mud feed pump 42. The filter press dewatering machine has good work efficiency because the solid-liquid separation target can be quickly separated into solid-liquid from the fine-grained material and the washing waste water when the pressure difference between the membranes is low like the fine-grained material.

  That is, a filter-type solid-liquid separation step is performed in which the fine particles discharged from the wet sorting step and the washing wastewater are solid-liquid separated by the filter press dehydrator 41.

  In addition, the filter press dehydrator 41 performs batch operation of two filter press dehydrators alternately, for example, and while the other filter press dehydrator is performing solid-liquid separation, the other filter press dehydrator is a cake. One filter press dehydrator is always configured to perform the fine particle separation process, for example, by discharging and cleaning.

  In the filter press dehydrator 41, the washing waste water and the fine particles are separated into solid and liquid, and the dehydrated fine ash is supplied to the cement raw material. The washing waste water discharged from the filter press dehydrator 41 is stored in the waste water storage tank 44.

  In this way, when the fine particles and the washing wastewater are solid-liquid separated by the filter press dehydrator 41, many suspended matters are solid-liquid separated from the washing wastewater together with the fine particles, and the washing wastewater discharged from the filter press dehydrator 41 is separated. The amount of fine particles and suspended matters that cause foaming is extremely reduced, and the washing wastewater returned to the wet sorting means 2 by the first circulation path 3 reduces the content of fine particles and reduces the risk of foaming. It is.

  The filtration-type solid-liquid separation means constituting the fine-particle separation means 4 is not limited to the filter press dehydrator 41, as long as it can solid-liquid separate fine particles and washing wastewater by filtration. It can also be used.

  If the wastewater discharged from the filter press dehydrator 41 contains heavy metals such as lead, zinc, and cadmium, add chemicals such as pH adjusters and chelating agents to remove heavy metals contained in the washed wastewater. It is preferable to remove.

  In the filter press dehydrator 41, the fine particles and the washing waste water are separated into solid and liquid, and the dehydrated fine ash is supplied to the cement raw material. The washing waste water discharged from the filter press dehydrator 41 is stored in the waste water storage tank 44.

  The drainage storage tank 44 is provided with a sand discharge pump 45 and a sand discharge path 46 for precipitating suspended substances mixed in miscellaneous water flowing from a drain pit (not shown) and returning them to the wet sorting means 2. If the processing flow is such that the miscellaneous water from the drain pit does not flow into the drainage storage tank 44, it can be returned to the screen device 28 as cleaning water instead of the wet sorting means 2.

  The cleaning wastewater overflowing the drainage storage tank 44 is returned to the wet sorting means 2 as cleaning water, and is discharged to the return water relay tank 47. In order to prevent an excessive supply of cleaning wastewater from the drainage storage tank 44 to the return water relay tank 47 and to prevent the cleaning drainage from overflowing from the return water relay tank 47, It is configured to be sent to a wastewater treatment facility for treatment.

  The washing wastewater stored in the return water relay tank 47 is returned to the wet sorting means 2 via the first circulation path 3 by the return water relay pump 48, and the water injection nozzles 23a, 23b, 23c, 23d and the washing nozzle 24b, The washing water tank 20 is used as re-washing water through 24c.

  The nozzle diameters of the water injection nozzles 23a, 23b, 23c, 23d and the washing nozzles 24b, 24c are preferably such that the suspended substances contained in the washing drainage are not clogged. You may comprise so that a slit may be formed in supply piping and washing waste_water | drain may be discharged from the said slit.

  That is, the first circulation process is performed in which the washing wastewater separated in the solid-liquid separation process by the filter-type dehydrator 41 by the first circulation path 3 is returned to the wet sorting process as washing water.

  The return water relay tank 47 is configured so that the washing waste water overflowing from the dehydrator adjusting tank 40 also flows. This is because if the amount of washing wastewater processed by the filter press dehydrator 40 is larger than the amount of washing water flowing into the dehydrator adjustment tank 40, the water level of the dehydrator adjustment tank 40 is lowered and the washing wastewater in the dehydrator adjustment tank 40 is exhausted. It is necessary to stop the filter press dehydrator 41 and restore the water level of the dehydrator adjustment tank 40.

  At this time, since the washing drainage does not flow into the return water relay tank 47, it is necessary to stop the return water relay pump 48, and the wash water supplied to the wet sorting means 2 is also stopped. Therefore, there are cases where the supply of the incinerated ash to the wet sorting means 2 must also be stopped.

  Therefore, the amount of washing drainage discharged by the filter press dehydrator 41 is set to be equal to or less than the amount of washing drainage flowing into the dehydrator adjustment tank 40, and the washing wastewater overflowing from the dehydrator adjustment tank 40 flows into the return water relay tank 47. With this configuration, there is no need to stop the operation of the powder processing system 1 depending on the operation status of the filter press dehydrator 41 as described above, and the object to be cleaned can be continuously and stably cleaned. It is.

  In addition, the plunger 31 of the pulsation washing tank 21 is provided separately from the route for supplying the rewash water supplied from the first circulation path 3 through the water injection nozzles 23a, 23b, 23c, 23d and the wash nozzles 24b, 24c. It is also possible to provide a route for supplying water from the water injection section 21a provided at the lower portion of the water and adjust the supply ratio of rewash water through each route. 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 re-cleaning means 5 is a classification device 51 as a medium-size classification means for classifying coarse grains and fine grains having a smaller particle diameter than the coarse grains while washing the medium-grain ash carried out by the bucket conveyor mechanism 29; And an ash sedimentation tank 53 as a fine particle washing means for washing the fine particles classified by the classification device 51, and a fine granule for solid-liquid separation of the fine particles classified by the classification means 51 and the washing waste water. A wet cyclone 52 is provided as a separating means, and fine particles separated by solid-liquid separation by the wet cyclone 52 are washed in an ash settling tank 53.

  That is, the re-cleaning means 5 executes a re-cleaning process for re-cleaning the medium-sized matter classified in the wet sorting process by the wet sorting means 2.

  The classification device 51 is configured by a wet vibration sieve device, and is dropped and supplied from the bucket conveyor mechanism 29 via the chute 50. Note that a screen device may be used as the classification device 51.

  The chute 50 and the classification device 51 are supplied with sprayed washing wastewater having a low chlorine concentration separated and solid-liquid separated by the wet cyclone 52, and are supplied from the new water supply path 8a (8) downstream of the classification device 51. New water for rinsing is sprayed and supplied, and the classifier 51 classifies the coarse ash and the fine ash while washing the medium ash.

  The classified coarse ash is drained and used as a cement raw material. Coarse ash having a large particle size has a small chlorine content and therefore does not require much washing.

  Fine ash and washing waste water classified by the classification device 51 are stored in a cyclone supply tank 56, and the fine particles and washing waste water stored in the cyclone supply tank 56 are uniformly stirred by a stirrer, and supplied by a supply pump 55. It is supplied to the wet cyclone 52.

  The washing wastewater separated by solid-liquid separation in the wet cyclone 52 is circulated and supplied to the chute 50 and the classifier 51 as washing water, and the excess washing wastewater is returned to the cyclone supply tank 56.

  The fine ash that has been solid-liquid separated by the wet cyclone 52 is discharged to an ash settling tank 53. The fine ash settled in the ash settling tank 53 is washed with new water for rinsing sprayed from the new water supply path 8b (8) while being carried out by the ash lifting conveyor 54, drained, and then the cement raw material. Served as. The washing waste water overflowing from the ash settling tank 53 is stored in the cyclone supply tank 56.

  Therefore, in this embodiment, the path from the classification device 51 to the cyclone supply tank 56, the path from the cyclone supply tank 56 to the wet cyclone 52, the path from the wet cyclone 52 to the ash settling tank 53, and the cyclone supply from the ash settling tank 53 The path from the wet cyclone 52 to the classification device 51 and the cyclone supply tank 56 is the second circulation path 7, and the cyclone supply tank 56 is provided in the second circulation path 7 and discharged from the re-cleaning means. It becomes the 2nd storage tank which stores the washed washing drainage.

  That is, the second circulation path 7 executes a second circulation process in which the cleaning wastewater discharged from the recleaning process by the recleaning means 5 is returned to the recleaning process as cleaning water.

  The cleaning wastewater overflowing from the cyclone supply tank 56 is supplied to the first circulation path 3 via the cleaning drainage supply path 9 and the return water relay tank 47. Note that the cleaning waste water from the return water relay tank 47 is configured not to flow backward to the cyclone supply tank 56.

  That is, the cleaning wastewater supply path 9 is configured such that a part of the cleaning wastewater discharged from the recleaning process overflows to the first circulation process as cleaning water.

  The washing wastewater stored in the cyclone supply tank 56 includes fine ash that has not been sufficiently separated by the wet sorting means 2, and such fine ash passes from the cyclone supply tank 56 to the washing wastewater supply path 9. Then, it is sent to the return water relay tank 47, classified again by the wet sorting means 2 through the first circulation path 3, and solid-liquid separated by the filter press dehydrator 41. Therefore, the foaming of the cleaning waste water can be suppressed over the entire granular material processing system, the generation of scum can be suppressed, and smooth operation becomes possible.

  The fine particle separation means is not limited to the wet cyclone 52, and may be configured to separate fine ash and washing wastewater by a known dehydrator, a sedimentation tank, or the like.

  The new water supply paths 8a and 8b are configured such that new water is supplied from supply pumps 81a and 81b provided in the new water storage tank 80.

  The new water supply paths 8a and 8b are configured to supply new water for rinsing to the classifier 51 and the ash settling tank 53, respectively, and new water is supplied to the re-washing process through the new water supply paths 8a and 8b. A water supply process is performed.

  The supply pumps 81a and 81b adjust the number of rotations to adjust the supply amount of new water supplied via the new water supply paths 8a and 8b, or to the new water supply paths 8a and 8b. An adjustment valve may be provided to adjust the supply amount of new water.

  As described above, since the chlorine content of the medium ash is less than the chlorine content of the fine ash, new water is supplied to the cleaning drainage flowing through the second circulation path 7, so Chloride ion concentration is kept low.

  Accordingly, the cleaning wastewater on the second circulation path 7 side where the chloride ion concentration is low flows to the first circulation path 3 side where the chloride ion concentration is high due to the cleaning drainage supply path 9, so that the first circulation path Even if new water is not supplied directly to 3, the chloride ion concentration of the washing waste water flowing through the first circulation path 3 can be efficiently reduced.

  As shown in FIG. 5, the granular material processing system 1 according to the present invention classifies the granular material into fine particles and medium particles having a larger particle diameter than the fine particles while washing the object to be processed by the wet sorting means 2. To do.

  As the wet sorting means 2, a known apparatus such as a wet vibrating screen apparatus or a screen apparatus can be applied. If coarse particles are mixed in the granular material, a jig as shown in FIG. It is effective to employ a sorting device.

  The particulate matter discharged from the wet sorting means 2 and the washing wastewater are solid-liquid separated by the particulate separation means 4 as a filtration type solid-liquid separation means, and the solid-liquid separation is performed by the particulate separation means 4 by the first circulation path 3. The washed waste water is returned to the wet sorting means 2 as washing water, the medium particles classified by the wet sorting means 2 are rewashed by the rewashing means 5, and discharged from the rewashing means 5 by the second circulation path 7. The washed washing wastewater is returned as washing water to the rewashing means 5, new water is supplied to the rewashing means 5 through the new water supply path 8, and the washing wastewater discharged from the rewashing means 5 through the washing drainage supply path 9 A part is supplied to the first circulation path 3.

  As described above, the present invention divides the circulation route of the cleaning wastewater according to the amount of chlorine that is an obstacle substance, that is, the cleaning wastewater having a large amount of chlorine elution is circulated in the first circulation route 3. New water supply without reducing the elution efficiency of chlorine by reusing the waste water with less chlorine elution amount through the second circulation path 7 and reusing it as wash water. The amount can be reduced.

  Furthermore, by making the fine particle separation means a filtration type, fine particles floating in the washing waste water can be collected, and foaming can be suppressed. Further, by adopting a filtration type solid-liquid separation means, a pump for drawing out the concentrate necessary for the concentrating device such as thickener becomes unnecessary, and there is no possibility of failure of the pump.

  The washing waste water discharged from the re-cleaning means 5 for washing the intermediate particles is rarely mixed with fine particles originally, but the fine particles adhere to the intermediate particles that have not been sufficiently cleaned by the wet sorting means 2. Even in the case where the cleaning waste water is supplied, the cleaning waste water discharged from the re-cleaning means 5 is supplied to the first circulation path 3 through the cleaning waste water supply path 9, and the fine particles in the cleaning waste water are also used as filtration solid-liquid separation means. It can be recovered by the object separation means 4. Therefore, foaming of the washing waste water can be suppressed over the entire powder body processing system 1, generation of mousse-like scum can be suppressed, and smooth operation becomes possible.

  If the treatment object is incinerated ash, and if it is possible to further reduce the supply of new water by further classifying the medium-sized material into fine-grained and coarse-grained material, a classification device will be installed. It will be adopted as appropriate depending on the properties of the object.

  In the above-described embodiment, the powder processing system and the powder processing method using the incinerated ash mixed with coarse materials such as metals, glass, and organic materials as a processing target have been described. The processing object of the granular material processing system and the granular material processing method is not limited to incineration ash. Thus, the present invention can also be applied when obtaining mortar and concrete raw materials.

  In addition, when soil is contaminated with heavy metals, such as landfill soil illegally dumped as an object to be treated, and the soil granular materials mixed with coarse materials as described above are recycled and reused. Applicable.

  In the above-described embodiment, the configuration in which the dehydrator adjustment tank 40, the drainage storage tank 44, the return water relay tank 47, and the cyclone supply tank 56 are arranged along the paths through which the washing drainage flows is described. , (B), (c), the dehydrator adjustment tank 40, the drainage storage tank 44, the return water relay tank 47, and the cyclone supply tank 56 are adjacent to each other and divided by the inflow weirs 70, 71, 72, 73. It may be configured.

  The inflow weir 70 between the drainage storage tank 44 and the return water relay tank 47 is set lower than the inflow weir 71 between the dehydrator adjustment tank 40 and the return water relay tank 47. The inflow weir 71 between the dehydrator adjustment tank 40 and the return water relay tank 47 is set lower than the inflow weir 72 between the return water relay tank 47 and the cyclone supply tank 56.

  The inflow weir 72 between the return water relay tank 47 and the cyclone supply tank 56 is set lower than the inflow weir 73 between the drainage storage tank 44 and the cyclone supply tank 56. A pipe 74 to the wastewater treatment facility provided in the wastewater storage tank 44 is set at a height between the inflow weir 70 and the inflow weir 71.

  By comprising in this way, the overflow waste_water | drain from the inflow weirs 70, 71, 72 will flow into the return water relay tank 47. Therefore, for example, even if the return water relay pump 48 installed in the return water relay tank 47 stops due to a failure or the like, and the water level of the return water relay tank 47 continues to rise, the return water relay tank 47 and the drainage storage tank 40 Since the stored cleaning wastewater flows out to the wastewater treatment facility through the pipe 74, the cleaning wastewater does not overflow from the dehydrator adjustment tank 40, the drainage storage tank 44, the return water relay tank 47, and the cyclone supply tank 56.

  It is needless to say that the specific configuration of the granular material processing system described above is not limited to the description of the above-described embodiment, and can be appropriately changed and designed within the scope of the effects of the present invention.

1: Powder processing system 2: Wet sorting means 3: First circulation path 4: Fine particle separation means 5: Re-cleaning means 7: Second circulation paths 8, 8a, 8b: New water supply path 9: Washing Wastewater supply path 10: Metal recovery unit 20: Washing water tank 21: Pulsating washing tanks 22a, 22b, 22c: Pulley 22: Conveyor belts 23a, 23b, 23c, 23d: Water jet nozzle 24: Input chute 24a: Inclined surfaces 24b, 24c : Cleaning nozzle 25: Coarse material outlet 25 a: Rotating brush 26: Overflow weir 27: Drainage basin 28: Screen device 29: Bucket conveyor mechanism 29 a: Bucket 30: Pulsation generator 31: Plunger 32: Rod 33: Eccentric sheave 34 : Motor 35: Rotating shaft 36: Belt conveyor device 37: Bellows 40: Dehydrator adjustment tank 41: Filter press dehydrator 42: Supply Pump 44: Drainage storage tank 45: Sand discharge pump 46: Sand discharge route 47: Return water relay tank 48: Return water relay pump 50: Chute 51: Classifier 52: Wet cyclone 53: Ash sedimentation tank 54: Ash lifting conveyor 55: Supply pump 56: Cyclone supply tank 70, 71, 72, 73: Inflow weir 80: New water storage tank 81a, 81b: Supply pump

Claims (5)

Wet sorting means for classifying fine particles and medium particles having a larger particle size than fine particles while washing the powder,
Fine particle separation means for solid-liquid separation of the fine particles discharged from the wet sorting means and washing waste water;
A first circulation path for returning the washing waste water separated by solid-liquid separation by the fine particle separation means to the wet sorting means as washing water;
Re-washing means for re-washing the medium particles classified by the wet sorting means;
A second circulation path for returning the washing wastewater discharged from the rewashing means to the rewashing means as washing water;
A new water supply path for supplying new water to the re-cleaning means;
A cleaning drainage supply path for supplying a part of the cleaning drainage discharged from the re-cleaning means to the first circulation path as cleaning water,
The granular material processing system in which the fine particle separation means comprises a filtration type solid-liquid separation means.   2. The granular material processing system according to claim 1, wherein the filtration type solid-liquid separation means is a filter press dehydrator. The first circulation path is provided with a first storage tank for storing washing wastewater separated by solid-liquid separation by the fine particle separation means,
The second circulation path comprises a second storage tank for storing the cleaning wastewater discharged from the recleaning means,
The granular material processing system according to claim 1, wherein the cleaning wastewater supply path is configured such that cleaning wastewater overflows from the second storage tank to the first storage tank. A wet sorting process for classifying fine particles and medium particles having a larger particle size than fine particles while washing the powder particles;
A fine particle separation step for solid-liquid separation of the fine particles discharged from the wet sorting step and washing waste water;
A first circulation step of returning the washing wastewater separated in the solid-liquid separation step as the washing water to the wet sorting step;
A re-washing step of re-washing the medium-sized particles classified in the wet sorting step;
A second circulation step of returning the washing wastewater discharged from the rewashing step to the rewashing step as washing water;
A new water supply step for supplying new water to the re-washing step;
A cleaning wastewater supply step for supplying a part of the cleaning wastewater discharged from the recleaning step to the first circulation step as cleaning water,
The granular material processing method in which the said fine particle separation means is comprised by the filtration type solid-liquid separation process.   The granular material processing method according to claim 4, wherein the filtration-type solid-liquid separation step includes a filter-press type solid-liquid separation step.

Images