JP2002011435A - Process and equipment for treating incineration ash - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an incineration ash treatment process by which the volume of incineration ash to be subjected to fusion/solidification can efficiently be reduced and accordingly, the scale of fusion/solidification facilities can be reduced and also the treatment cost can be reduced. SOLUTION: This treatment process comprises: charging incineration ash into a treatment space of a grinding treatment device 30 and adding water to the charged incineration ash; subjecting granules in the resulting incineration ash to grinding treatment for grinding the granules into finer granules by applying compressive force and intergranular frictional force to the granules in the incinerating ash; thereafter, separating and extracting a very fine grain fraction having high contents of harmful substances such as heavy metals and dioxins, from the finer granules by using a liquid cyclone 50; forming the extracted very fine grain fraction into dehydrated cake; also, from the remaining finer granules separated from the very fine grain fraction, extracting fine grainy incombustible matter having 0.5-5 mm grain size and very fine grainy incombustible matter having 50 μm 1 to 0.5 mm grain size, with a two-stage vibrating screen 71; and charging only the dehydrated cake and the very fine grainy incombustible matter into a fusion/solidification treatment device 80 to fuse and solidify.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detoxifying incinerated ash, and more particularly to a method for detoxifying incinerated ash by reducing its amount.

[0002]

2. Description of the Related Art Conventionally, combustible materials such as garbage that cannot be recycled are mainly incinerated in stoker-type incinerators or fluidized-bed incinerators, and the incineration residues (main ash) of the incinerators are incinerated ash. It is transported to the disposal site and buried. The actual incineration ash contains metal scraps and pieces of glass or pottery, earth and sand, etc., which are incinerated with the above combustibles. Therefore, the components of the incineration ash include various metals, silica, alumina, Lime etc. are mixed. Such incinerated ash has a large amount of waste, and harmful substances such as heavy metals and dioxins generated in the incineration process adhere to the incinerated ash. The establishment of utilization technology is desired.

[0003] Methods for detoxifying incinerated ash include melt solidification, cement solidification, and chemical treatment. Melt solidification is
Since incinerated ash is melted at a high temperature of about 1500 ° C. or more, dioxins can be decomposed by thermal decomposition, and heavy metals can be sealed inside the melt, so that even if the melt touches water, It is said that the heavy metals do not elute. At present, it is said that the treatment by melt-solidification is the most effective, and this melt-solidification is the mainstream of incineration ash treatment methods. Since the molten material has been rendered harmless by the solidification,
Discarded at a waste disposal site or crushed and reused as fine particles.

[0004]

However, the above detoxification method by melt solidification requires large equipment such as a melting furnace and a large amount of fuel in order to melt incinerated ash at a high temperature. As a result, the construction cost and processing cost of the equipment increase. Therefore, in order to reduce the size of equipment required for the melt-solidification treatment and to reduce the treatment cost, it is desired to develop a technology for reducing the amount of incinerated ash and then rendering it innocuous.

[0005] The present invention has been made in view of the conventional problems, and by reducing the amount of detoxified incinerated ash efficiently and detoxifying it, it is possible to reduce the scale of detoxification facilities such as ash melting facilities and the like. Another object of the present invention is to reduce processing costs.

[0006]

According to a first aspect of the present invention, there is provided a method for treating incinerated ash, comprising supplying the slurried incinerated ash to a fine particle separation device to separate fine particles, Is supplied to a classifying step to extract fine incombustible particles having a predetermined particle size or less and detoxify the particles.

A method for treating incinerated ash according to a second aspect is characterized in that the fine incombustibles are rendered harmless by melting and solidifying.

[0008] The method for treating incinerated ash according to claim 3 is characterized in that the fine particles are detoxified by melting and solidifying.

The method for treating incinerated ash according to claim 4 is characterized in that the finely divided granules are subjected to a grinding process in which the granules in the incinerated ash are rubbed together under water to be finely divided. Is supplied to the fine particle separation step.

According to a fifth aspect of the present invention, there is provided a method for treating incinerated ash, wherein the treated water discharged at the time of producing a dewatered cake is returned to at least one of the grinding step and the fine particle separating step. It is characterized by the following.

According to a sixth aspect of the present invention, there is provided an incineration ash treatment apparatus comprising: a fine particle extraction means for extracting fine particles from incineration ash containing incineration residues of an incinerator; and a means for melting and solidifying the fine particles. An apparatus for treating ash, wherein the fine particle extraction means comprises:
An incineration ash is introduced into the processing space to add water thereto, and a grinding treatment apparatus for applying the force of compression and rubbing between the particles to the granules in the incineration ash to refine the granules; and A fine particle separation device for separating and extracting fine particles from the granulated particles, and a classification means for classifying fine incombustible particles having a predetermined particle size or less from the separated fine particles. This is to melt and solidify the fine particles and the fine incombustibles.

The apparatus for treating incineration ash according to claim 7 is provided with means for producing a dewatered cake from the slurry containing the fine particles discharged from the fine particle separation apparatus.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of an incineration ash processing apparatus according to an embodiment of the present invention. This processing apparatus rubs and granulates particles in incineration residues (main ash) of an incinerator. Grinding is performed to separate and extract fine particles containing many harmful substances such as heavy metals and dioxins from the finely divided main ash, and the harmful substances are separated from the separated granular material of the fine particles. Classifying and extracting fine incombustible substances having a predetermined particle size or less that may possibly remain in a small amount, and melting and solidifying the fine particles and the fine incombustible substances to render them harmless. In addition, fly ash captured in the incinerator is melted and solidified separately from the fine particles and the fine incombustibles, or together with the fine particles and fine incombustibles. In the figure, reference numeral 20 denotes pre-sorting means, which comprises vibrating sieves 23, 27 and magnetic sorters 24, 25, and converts primary ash (hereinafter referred to as incinerated ash) stored in the ash pit 10 of the incinerator. Contaminants such as glass pieces and pieces of pottery having a diameter of more than about 20 mm, iron scraps, and the like are selected and eliminated in advance. Numeral 30 denotes an attrition treatment device for adding water to the incineration ash to apply compressive stress to the granules in the incineration ash, thereby breaking the aggregated granules in which the granules are fixed to each other. The particles are separated into almost independent particles and finely divided, and the rubbing force between the particles is applied to cause mutual polishing by friction between the particles, and adhere to the surface of the particles. A grinding process is performed to separate harmful substances such as heavy metals and dioxins from the surface of the granular material.

Reference numeral 40 denotes a vibrating sieve for selecting and separating coarse incombustible materials having a size of 5 mm or more from the slurry containing the granular material refined by the attrition treatment device 30, and 50 represents the finely divided granular material. The liquid cyclone 60, which is a fine particle separation device for separating and extracting fine particles containing a large amount of harmful substances such as heavy metals and dioxins having a particle size of less than 50 μm from the body, is sent from the vibrating sieve 40 to the liquid cyclone 50. A feed sump which is a liquid supply means for supplying a slurry containing granular material having a diameter of 5 mm or less.

Reference numeral 70 denotes a raw water tank for temporarily storing a slurry containing fine particles of harmful substances such as heavy metals and dioxins discharged from the liquid cyclone 50 and a slurry containing fine particles having the harmful substances remaining on the surface. Represents a particle having a particle size of 0.5
Fine incombustible material of 5mm to 5mm and particle size of 50m to 0.5m
This is a two-stage vibrating screen for classifying m non-combustible materials. Reference numeral 72 denotes a filter press for producing a dewatered cake from the slurry containing fine particles discharged from the liquid cyclone 50, and reference numeral 73 denotes a water purification device for purifying the treated water of the filter press 72. The dehydrated cake produced above is accumulated in the accumulation place 74, and the filter press 7
The treated water (filtrate) 2 is returned to the grinding device 30 and the feed sump 60. The treated water purified by the water purifying device 73 is sent to two jet water devices 75 and 76 for supplying treated water (wash water) to the vibrating sieve 40 and the high-performance dewatering screen 71, respectively. 8
Reference numeral 0 denotes a melt-solidification treatment device, which is a pulverizing / kneading machine 81 that mixes and crushes and kneads the fine incombustibles and the dewatered cake;
A drying furnace 82 for drying the kneaded processing material and a melting furnace 83 for melting and solidifying the dried processing material at a high temperature of about 1500 ° C. or more are provided, and only the fine incombustibles and the dewatered cake are dried and melted. Solidify.

Next, a method of treating incineration ash using the incineration ash treatment apparatus having the above configuration will be described with reference to the flowchart of FIG. First, from the incineration ash stored in the ash pit 10 of the incinerator, pre-sorting means 20 preliminarily sorts out foreign substances such as glass pieces and pieces of pottery, which have a particle size of more than about 20 mm, and iron chips. Exclude (step S1).
In detail, the above-mentioned incineration ash is thrown into the receiving hopper 21,
After being conveyed to the first vibrating sieve 23 by the feeder 22 to sort the granular material having a particle size of about 20 mm or less, and further passed through a magnetic sorter 24 to remove iron chips, the milling treatment device 30 throw into. At the input port of the receiving hopper 21, a classification net 21a of about 50 mm is provided in advance, and large-sized contaminants are captured and removed. The granular material having a particle size of more than about 20 mm selected by the vibrating sieve 23 is subjected to a crusher 2 after removing iron scraps by a magnetic sorter 25.
6 and further sent to a second vibrating sieve 27,
Glass fragments having a particle size of 20 to 50 mm, pieces of pottery or non-ferrous metals are separated. The above-mentioned vibration sieve 2
The granular material that has passed through 7 is sent to the first vibrating sieve 23 and re-sorted.

The granular material having a particle size of about 20 mm or less selected by the pre-selection means 20 is supplied to a grinding treatment device 30. In the attrition treatment device 30, the granules in the incineration ash are refined while adding treated water to the granules, and harmful substances such as heavy metals and dioxins adhered to the surface of the granules are removed. A grinding process is performed to separate and separate by floating or dissolving in treated water (step S
2). In addition, the filtrate discharged at the time of producing a dehydrated cake described later is used as the treated water. 3 and 4 are views showing the configuration of the grinding apparatus 30. FIG. 3 is a side view, and FIGS. 4 (a) and 4 (b) are cross-sectional views taken along line AA of FIG.
It is B sectional drawing. The grinding processing device 30 is attached to the inner peripheral surface along the axial direction, and is attached to the cylindrical rotary drum 31 having a plurality of outer blades 31W protruding in the center direction, and attached to the outer peripheral surface along the axial direction, A motor (not shown) having a plurality of radially projecting inner blades 32W, a rotor 32 eccentrically mounted inside the rotary drum 31 and an annular gear 33 provided on the outer periphery of the rotary drum 31; The rotating shaft 34 attached to the rotor 32 is rotated in a direction opposite to each other by a driving mechanism 35 to thereby rotate the grinding processing apparatus 3.
In addition, compressive and sliding stresses are applied to the incineration ash, which is the processing material charged into the material input port 36, to separate the aggregated incineration ash into substantially independent granules and refine the same. The rubbing force between the granules is mainly applied to the granulated granules to perform mutual polishing by friction between the granules, and heavy metals attached to the surface of the granules It separates harmful substances such as water and dioxin by floating or dissolving them in treated water. The magnitude of the stress acting on the processing material mainly depends on the rotor 32
The distance between the rotating drum 31 and the rotor 32, which is determined by the diameter and the eccentricity of the rotating drum 31, and the respective rotational speeds of the rotating drum 31 and the rotor 32 are adjusted. In order to efficiently perform the grinding process, the grinding device 30 according to the present embodiment reduces the diameter of the rotor 32 and reduces the diameter of the rotor 32 on the upstream side, as shown in FIG. Distance D to 32
₁ is relatively widened, and the incineration ash is subjected to a process mainly for refining, and on the downstream side, as shown in FIG.
To perform the grinding process mainly mutual grinding between granules to said granules, and reduce the distance D ₂ between the rotary drum 31 and the rotor 32 is large diameter of the rotor 32.

The slurry containing the granular material refined by the attrition treatment device 30 is sent to a vibrating sieve 40. In the vibrating sieve 40, while washing the granules by jetting jet water from a jet water device 75 to the slurry containing the granules, coarse incombustibles mainly composed of gravel and having a particle size of 5 to 20 mm are removed. And separating from harmful substances suspended or dissolved in the slurry (step S).
3). In general, harmful substances such as heavy metals and dioxins attached to incinerated ash are said to be relatively strongly attached to the surface of granular materials having a particle size of about 2 mm. For the body, the vibrating sieve 4
By cleaning such as 0, dioxins adhering relatively weakly to the surface of the granular material can be removed. The water used in the vibrating sieve 40 includes:
As pre-cleaning, treated water purified by a water purifying device 73 described later is used, and then a new jet water device 75 is used.
Was supplied for post-washing. As a result, the treated water can be effectively used, and the salt in the slurry can be efficiently diluted, so that the granular material can be desalted without providing a desalination facility.

The particle size passing through the vibrating sieve 40 is 5 m.
m or less containing the granular material is supplied to the feed sump 6.
0 through a liquid cyclone 50 which is a particle separation device.
The slurry is separated into a slurry containing fine particles having a particle size of less than 50 μm and a slurry containing a granular material having a particle size of 50 μm to 5 mm (step S4). FIG. 5 is a schematic diagram showing a configuration of the hydrocyclone 50. Liquid cyclone 50
Injects liquid containing granular materials of various sizes at a high speed onto the inner wall of a cylindrical main body 51 configured such that the inner diameter is gradually narrowed below, so that the particle diameter contained in the liquid is small. In the device for separating the granular material, the liquid pressure-fed into the main body 51 from the processing material introduction pipe 52 provided on the upper wall of the main body 51 is formed on the inner wall of the main body 51 while forming a vortex called a primary rotational flow. When moving downward along the body 51
The phenomenon utilizes the phenomenon that the air pressure at the central part of the liquid decreases and the liquid rises from the inside of the primary rotational flow while forming a vortex called the secondary rotational flow. That is, the granular material having a small particle diameter contained in the slurry pumped to the main body 51 of the hydrocyclone 50 is carried by the secondary rotation flow and moves in the upper direction of the main body 51, and is moved to the upper central part of the main body 51. Is discharged through a riser 53 provided at the bottom. In the present embodiment, the slurry containing the particulate matter having a small particle diameter discharged from the riser 53 is supplied to the raw water tank 7 (not shown) by the transfer pipe 54 connected to the outlet side of the riser 53.
0 and temporarily stored (see FIG. 1). On the other hand, the granular material having a large particle diameter contained in the slurry is the main body 51.
Is moved downward while colliding with the inner wall of the processing material, and is discharged from a lower discharge port 55 s provided at a distal end portion of a processing material discharge pipe 55 attached to a lower portion of the main body 51.

The particle size sent to the raw water tank 70 is 50 μm.
In a slurry containing a fine particle content of less than
Separated from the surface of the incinerated ash by vibrating sieve 4
It contains a lot of harmful substances such as heavy metals and dioxins suspended or dissolved in the treated water of No. 0. In the present embodiment, a dewatered cake is prepared from the slurry using the filter press 72 (step S5). On the other hand, when the particle size is 5
The slurry containing the particles of 0 μm to 5 mm is sent to the two-stage vibrating screen 71. In the two-stage vibrating screen 71, while jetting jet water from a jet water device 76 onto the slurry to wash the granular material, first, a fine incombustible material having a particle size of 0.5 mm to 5 mm is separated and extracted. Next, fine incombustibles having a particle size of 50 μm to 0.5 mm are separated and extracted (step S7). The treated water containing fine particles of less than 50 μm that has passed through the two-stage vibrating screen 71 is sent to the feed sump 60, where the fine particles are separated again by the hydrocyclone 50. In addition, the filtrate of the filter press 72 is reused as treatment water of the attrition treatment device 30 and supply water to the feed sump, and a part of the treatment water used by the filter press 72 is sent to the water purification device 73. After being purified, the jet water devices 74, 7
5, the vibrating screen 40 and the two-stage vibrating screen 71
Reused as treated water for pre-cleaning. In the two-stage vibrating screen 71, classification is performed by using the treated water purified by the water purification device 73 and the makeup water newly supplied to the jet water device 75 in order. Therefore, 2
Also in the case of the step vibrating screen 71, similarly to the case of the vibrating sieve 40, the salt in the slurry can be efficiently diluted.

The dehydrated cake containing a large amount of harmful substances such as heavy metals and dioxins is accumulated in an accumulation site 74 and then sent to a pulverizing / kneading machine 81 of a melting and solidifying apparatus 80. Also, the fine incombustible particles having a particle size of 50 μm to 0.5 mm extracted by the two-stage vibrating screen 71 have a small particle size, so that there is a possibility that a small amount of the harmful substance may remain. The mixture is sent to the above-mentioned pulverizing and kneading machine 81 for detoxification. In the melt-solidification treatment device 80, a pretreatment of mixing the dehydrated cake and the fine incombustible material, crushing and kneading is performed by using a crushing and kneading machine 81, and the kneaded processing material is sent to a drying furnace 82. In the drying furnace 82, after the processing material is sufficiently dried, it is put into the melting furnace 83,
The processing material is melted and solidified at a high temperature of 0 ° C. or higher to render it harmless (step S6). In addition, fly ash generated together with the above incineration ash (incineration residue of the incinerator; main ash) and captured in the incinerator is separate from the above-mentioned fine particles and fine incombustibles.
Alternatively, the melting furnace 83 may be used together with the fine particles and the fine incombustibles.
Is melted and solidified. In the melt-solidification, the dioxins contained in the dewatered cake are thermally decomposed at a high temperature, and the heavy metals are sealed in the melt, so that the dewatered cake can be rendered harmless. The above melt is
Either discarded at a waste disposal site or crushed and reused as fine particles. Further, a coarse incombustible material mainly composed of gravel and having a particle size of 5 to 20 mm classified by the vibrating sieve 40 and a fine incombustible material having a particle size of 0.5 mm to 5 mm classified by the two-stage vibrating screen 71 Since harmful substances such as heavy metals and dioxins are separated, they are reused as aggregate for concrete or discarded at a waste disposal site.

As described above, according to the present embodiment, the incinerated ash is put into the processing space of the attrition treatment device 30 to add water thereto, and the granules in the incinerated ash are compressed and rubbed by the particles. And then subjecting the granular material to a grinding treatment for finely dividing the granular material, and separating the fine particles containing a large amount of harmful substances such as heavy metals and dioxins from the finely divided granular material by the liquid cyclone 50. Extraction to produce a dewatered cake, and the two-stage vibrating screen 71 uses the two-stage vibrating screen 71 to extract fine incombustibles having a particle size of 0.5 mm to 5 mm and a particle size of 50 μm to 0.1 μm. A 5 mm fine incombustible material was extracted, and the dewatered cake and the fine incombustible material in which a small amount of the harmful substance might remain were put into a melt-solidification treatment device 80 to be melt-solidified. Therefore, incineration ash that melts and solidifies is effective. Well and volume reduction can be harmless. That is, in the present embodiment, only the dehydrated cake containing a large amount of harmful substances such as heavy metals and dioxins and the fine incombustibles in which the harmful substances may remain in a small amount are melted and solidified. The coarse and fine incombustible materials separated in the above process, from which harmful substances have been removed and having a particle size of 0.5 mm or more, do not need to be melt-solidified, and the amount of incinerated ash to be melt-solidified is reduced. It can be significantly reduced. Therefore, the scale of the ash melting facility can be reduced, and the processing cost can be reduced. Further, in the present embodiment, the two-stage vibrating screen 71 is used to extract fine incombustibles having a particle size of 50 μm to 0.5 mm and to melt and solidify the incombustibles.
The amount of dewatered cake can be reduced, the load on the filter press 72 can be reduced, and the size of the filter press 72 can be reduced. For example, the two-stage vibrating screen 71 is a one-stage vibrating screen, and only fine incombustible particles having a particle size of 0.5 mm to 5 mm are extracted and dewatered from a slurry containing granular materials having a particle size of 0.5 mm or less. In the present embodiment, the amount of the dehydrated cake produced is significantly reduced as compared with the case of producing a cake. Furthermore, while the moisture content of the dewatered cake is about 60%, the moisture content of the fine incombustibles is about 30%, so that the load on the drying furnace 82 can be reduced and the drying furnace can be downsized. Can be.

Further, the filtrate of the dewatered cake from the filter press 72 is returned to the grinding device 30 and the liquid cyclone 50, and a part of the filtrate is purified by the water purification device 73 to be classified. Since it is used for pre-cleaning of the two-stage vibrating screen 71), the treated water can be used effectively. Furthermore, in the classification means,
Since the newly supplied auxiliary water is used in the post-washing, the salt in the slurry can be efficiently diluted. Further, in the present embodiment, the treated water containing the auxiliary water is circulated and used, so that not only the treated water is not discharged to the outside of the apparatus, but also the water quality is subdivided for each step such as grinding and classification. By using this, the amount of water used in the entire apparatus can be significantly reduced, and the scale of the water treatment facility 73 can also be reduced. The ratio of the filtrate to be purified by the water purification device 73 and the amount of auxiliary water to be supplied to the classification step are appropriately determined depending on the type of the incineration ash, the treatment amount, and the like.

The fine incombustible material having a particle size of 50 μm to 0.5 mm and a dewatered cake containing a large amount of harmful substances such as heavy metals and dioxins can be treated by another treatment method such as cement solidification or chemical treatment. Although it may be made harmless, the above-mentioned melt-solidification treatment is desirable for making it more harmless. In the above example, the grinding process is performed by one grinding device 30.
A first grinding device in which the diameter or the amount of eccentricity of the rotor 32 is small and the rotation speed is low, and a grinding process mainly performing mutual polishing of the granular materials; 2 of the second grinding device with high speed
The grinding processing may be performed using a grinding processing apparatus of a table.
Further, as the fine particle separation device, the above-mentioned liquid cyclone 5 is used.
Instead of 0, for example, a particle separation device 90 having another configuration as shown in FIG. 6 may be used. This particle separation device 90 is provided with a processing material introduction pipe 92 on the bottom side of a cylindrical main body 91.
Is provided with an impeller 95K for abruptly decelerating the slurry which is pressure-fed into the main body 91 and descends while rotating along the inner wall of the main body 91, whereby solid-liquid separation of the introduced slurry is performed. Is further discharged, and the small-sized particles contained in the slurry are efficiently discharged from the rising pipe 93 provided at the upper center of the main body 91 to the transfer pipe 94, and the large-sized particles are removed from the main body 91. 91 Lower discharge port 9 provided at the end of solid matter collection pipe 95 attached to the lower part
It is discharged from 5s.

[0025]

As described above, according to the first aspect of the present invention, the slurried incinerated ash is supplied to the fine particle separating apparatus to separate fine particles and remove the fine particles. The remaining particulate matter is supplied to the classification step, and fine incombustible particles having a predetermined particle size or less are extracted and detoxified, so that the incinerated ash to be melted and solidified can be efficiently reduced and detoxified. . Therefore, it is possible to reduce the scale of the detoxification facility such as the ash melting facility and to reduce the processing cost. In addition, since fine incombustibles are separately extracted from the granular material from which the fine particles have been removed, the amount of fine particles to be treated can be reduced, and the burden on subsequent steps such as a dehydration step and a drying step can be reduced. Can be reduced.

According to the second aspect of the present invention, since the fine incombustibles are melted and solidified, the fine incombustibles can be surely rendered harmless.

According to the third aspect of the present invention, since the fine particles are melted and solidified, the fine particles can be reliably rendered harmless.

According to the fourth aspect of the present invention, in the grinding treatment step in which the granules in the incinerated ash are rubbed together under water to make the granules finer, heavy metals and dioxins adhered to the granules are removed. After the harmful substances are suspended or dissolved in the treated water and separated, the finely divided granules are supplied to the fine particle separation process, so the incinerated ash must be surely reduced and made harmless. Can be.

According to the fifth aspect of the present invention, the treated water discharged at the time of preparing a dewatered cake from the slurry containing the fine particles is subjected to at least one of the above-mentioned grinding treatment step and fine particle separation step. Since it returned to, treated water can be used effectively.

Further, according to the invention of claim 6, a grinding treatment device, a fine particle separation device, and a classification means for classifying fine incombustible particles having a predetermined particle size or less from the granular material separated from the fine particles. The fine particle extraction means provided with the above, the fine particles in the incineration ash containing a lot of harmful substances such as heavy metals and dioxins are extracted from the incineration ash subjected to the melt-solidification treatment, and the above-mentioned fine particles are separated. Since fine incombustibles are extracted from the slurry containing the body and only the extracted fine particles and the fine incombustibles are melted and solidified, the melting processing equipment can be downsized and the processing cost can be reduced. .

According to the seventh aspect of the present invention, since means for preparing a dewatered cake from the slurry containing the fine particles discharged from the fine particle separation device is provided, the reduced incinerated ash is efficiently melted and solidified. be able to.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an incineration ash processing apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a method for treating incineration ash according to the present embodiment.

FIG. 3 is a diagram showing a configuration of a grinding processing apparatus according to the present embodiment.

FIG. 4 is a cross-sectional view illustrating a configuration of a grinding processing apparatus according to the present embodiment.

FIG. 5 is a schematic diagram showing a configuration of a hydrocyclone.

FIG. 6 is a diagram showing another configuration of the particle separation device.

[Explanation of symbols]

Reference Signs List 10 Ash pit, 20 Pre-sorting means, 21 Receiving hopper, 22 Feeder, 23 First vibrating sieve, 2
4,25 Magnetic sorter, 26 Crusher, 27 Second vibrating sieve, 30 Grinding treatment device, 40 Vibrating sieve, 50 Liquid cyclone, 60 feed sump, 7
0 raw water tank, 71 two-stage vibrating screen, 72 filter press, 73 water purification device, 74 accumulation place, 75, 7
6 jet water equipment, 80 melt solidification processing equipment,
81 crusher / kneader, 82 drying furnace, 83 melting furnace.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B03B 7/00 F23J 1/00 B 9/06 B09B 3/00 303L F23J 1/00 ZAB (72) Inventor Shigeki Abe 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Tokyo Main Office (72) Inventor Shinwa Takakura 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo Main Office (72) Inventor Maemura Tatsuji 2-1, Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo headquarters (72) Inventor Yutaka Shinta 265 Sakurazawa, Yorii-cho, Osato-gun, Saitama Prefecture Inside Shinrokuseiki Co., Ltd. (72) Inventor Takao Tango F-term (reference), 3-3, Shinjuku 2-chome, Shinjuku-ku, Tokyo 3K061 NB01 NB21 4D004 AA36 AB07 AC05 CA04 CA08 CA09 CA10 CA13 CA15 CA29 CB13 CB34 CB42 CB43 CC03 4D063 EE09 EE11 FF14 FF21 FF37 GA10 GC01 GC07 GC16 GC32 GD27 4D071 AA05 AA30 AA53 AB03 AB04 AB14 AB24 AB25 AB44 AB49 CA03 CA05 DA15

Claims (7)

[Claims] 1. A slurried incineration ash is supplied to a fine particle separation device to separate fine particles, and the remaining granular material from which the fine particles are removed is supplied to a classification step to provide a predetermined particle size. A method for treating incinerated ash, characterized by extracting the following fine incombustibles and detoxifying them. 2. The method for treating incinerated ash according to claim 1, wherein said fine incombustible material is rendered harmless by melting and solidifying. 3. The method for treating incineration ash according to claim 1, wherein said fine particles are rendered harmless by melting and solidifying. 4. After passing through a grinding treatment step in which the granules in the incinerated ash are rubbed together under water to reduce the size, the finely divided granules are supplied to the fine particle separation step. The method for treating incinerated ash according to claim 1, wherein: 5. A method for producing a dewatered cake from the fine particles, and returning treated water discharged at the time of producing the dehydrated cake to at least one of the grinding step and the fine particle separation step. Claim 1 characterized by the following:
The incineration ash treatment method described in 1. 6. An incineration ash processing apparatus comprising: a fine particle extraction means for extracting fine particles from incineration ash containing incineration residues of an incinerator; and a means for melting and solidifying the fine particles. Extraction means is to add incineration ash to the treatment space and add water,
A grinding treatment device for applying the force of compression and rubbing between the particles to the granules in the incinerated ash to refine the granules, and separating fine particles from the granulated granules An incineration ash processing device, comprising: a fine particle separation device for extracting; and a classification means for classifying fine incombustible particles having a predetermined particle size or less from the granular material separated from the fine particles. 7. The apparatus for treating incinerated ash according to claim 6, further comprising means for producing a dewatered cake from the slurry containing the fine particles discharged from the fine particle separation apparatus.