Waste disposal methods

Abstract

To provide an efficient treatment method of incineration ash and waste concrete.SOLUTION: A waste treatment method includes: a mixing step of mixing incineration ash and waste concrete; a crushing step of crushing a mixture obtained in the mixing step; a cement raw material recovery step of subjecting a crushed material obtained in the crushing step to one or more selected from wind sorting and sieve sorting, supplying a heavy matter separated by the wind sorting and / or a material above the sieve separated by the sieve sorting to a next step, and recovering a light matter separated by the wind sorting and / or a material under the sieve separated by the sieve sorting as a cement raw material; and a metal recovery step of subjecting the supplied matter from the cement raw material recovery step to one or more selected from magnetic sorting, eddy current sorting and gravity sorting, and recovering metal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for treating waste. [Background technology]

[0002] Cement plants reuse incineration ash, a waste product, as a cement raw material. However, before it can be used as a raw material, it undergoes pretreatment processes, including crushing, sieving, and magnetic separation, to remove metal lumps and other contaminants. However, because incineration ash contains a high level of moisture due to water cooling and sprinkling to prevent dust generation, if it is directly introduced into the pretreatment process, a large amount of ash will adhere to the equipment and form aggregates, causing blockages within the equipment. This can lead to reduced throughput, equipment shutdowns, and the need to remove the deposits, resulting in reduced production efficiency. One solution to this problem is to heat and dry the ash to reduce its moisture content, but securing a heat source requires a large amount of energy. Sun-drying the ash is also an option, but this method is difficult to achieve consistently in humid climates.

[0003] Therefore, various techniques for modifying incineration ash to prevent adhesion and agglomeration have been investigated. For example, a method for preventing agglomeration by using a modifier selected from municipal waste incineration fly ash, coal fly ash, limestone powder, and crushed sand before crushing or classifying the incineration ash (Patent Document 1), a method for preventing adhesion of municipal waste incineration ash contaminated with radioactive cesium by adding a modifier such as quicklime, slaked lime, calcium carbonate, or cement (Patent Document 2), a method for preventing adhesion by mixing an anti-adhesion material such as calcium oxide with incineration ash (Patent Document 3), and a method for preventing adhesion of incineration ash by adding an organic compound such as a lignin-based compound (Patent Document 4) have been proposed.

[0004] On the other hand, waste concrete is widely reused as roadbed material after crushing and classification, and many methods have been developed to produce recycled aggregate by removing cement from aggregate particles through crushing. For example, Patent Document 5 proposes a method in which waste concrete is roughly crushed and sieved, and the sieve residue is crushed, ground, and classified to separate and recover recycled coarse aggregate, recycled fine aggregate, and fine waste concrete powder. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-58059 [Patent Document 2] Patent No. 6313205 Specification [Patent Document 3] Japanese Patent Application Publication No. 2020-124679 [Patent Document 4] Japanese Patent Application Laid-Open No. 2001-4121 [Patent Document 5] Japanese Patent Application Laid-Open No. 2012-17227 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the methods described in Patent Documents 1 to 4 all use materials that are generally treated as valuable materials as adhesion prevention materials, and have the problem that costs increase as the amount of incineration ash to be treated increases. Furthermore, the method described in Patent Document 5 can replace limestone, which is a calcium source among cement raw materials, but the increase in alkaline components due to the inclusion of aggregate and profitability become issues. Until now, methods for reusing incineration ash and waste concrete have only been studied separately, and simultaneous processing and reuse of both has not been considered. An object of the present invention is to provide an efficient method for treating incineration ash and waste concrete. [Means for solving the problem]

[0007] The inventors have investigated the simultaneous reuse of incineration ash and waste concrete, and have found that waste concrete exhibits the effect of preventing adhesion and agglomeration of incineration ash, and that it is possible to improve the handling of incineration ash without the need for the anti-adhesion material that has been used conventionally. In addition, since the metal particles in the incineration ash function as a grinding medium for the waste concrete, incineration The present inventors have found that by crushing a mixture of ash and waste concrete and subjecting it to a specific physical separation process, cement raw materials and metals can be separated and recovered.

[0008] That is, the present invention provides the following [1] to [8]. [1] A mixing step of mixing incineration ash and waste concrete; a crushing step of crushing the mixture obtained by the mixing step; a cement raw material recovery step of subjecting the crushed material obtained in the crushing step to one or more selected from air sorting and sieve sorting, supplying heavy materials separated by air sorting and / or oversized materials separated by sieve sorting to a next step, and recovering light materials separated by air sorting and / or undersized materials separated by sieve sorting as cement raw materials; a metal recovery step in which the feed from the cement raw material recovery step is subjected to one or more methods selected from magnetic separation, eddy current separation, and gravity separation to recover metals; A method for treating waste, including: [2] The metal recovery process includes a first process of magnetically separating the material supplied from the cement raw material recovery process into magnetically separated and non-magnetic materials, recovering iron scrap as the magnetically separated material, and supplying the non-magnetic materials to a subsequent process; a second step in which the non-magnetic material from the first step is separated by eddy current sorting into non-magnetic metals and non-metals, recycled aggregate and / or roadbed material are recovered as the non-metals, and the non-magnetic metals are supplied to the next step; The method for treating waste according to [1] above, further comprising a third step of gravity separating the non-magnetic metals from the second step into heavy products and light products, recovering precious metals as the heavy product and aluminum as the light product. [3] A method for treating waste according to [1] or [2], wherein the incineration ash and waste concrete are mixed in a mass ratio (waste concrete / incineration ash) of 1 / 7 or more. [4] The method for treating waste according to any one of [1] to [3] above, wherein the size of the incineration ash and waste concrete is less than 40 mm. [5] The method for treating waste according to any one of [1] to [4] above, wherein the moisture content of the incineration ash is 15% by mass or more. [6] The method for treating waste according to any one of [1] to [5] above, wherein in the crushing step, the mixture is crushed to a size of less than 20 mm. [7] An agent for preventing adhesion or aggregation of incineration ash, the active ingredient of which is crushed waste concrete. [8] A method for preventing adhesion or agglomeration of incineration ash by mixing incineration ash with crushed waste concrete. [Effects of the Invention]

[0009] According to the present invention, by simultaneously treating incineration ash and waste concrete, which are waste materials, it is possible to efficiently separate and recover valuable materials contained in the waste materials while preventing adhesion and agglomeration of the incineration ash. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a flowchart showing an example of a waste treatment method of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0011] The waste treatment method of the present invention is characterized by comprising a mixing step, a crushing step, a cement raw material recovery step, and a metal recovery step. Each step will be described in detail below.

[0012] [Mixing process] This process involves mixing incineration ash with waste concrete, which prevents the incineration ash from adhering and forming aggregates. In this process, the incineration ash preferably used is bottom ash that accumulates at the bottom of an incinerator when municipal waste, industrial waste, or sewage sludge is incinerated. The bottom ash may also contain fly ash, which is soot in the exhaust gas from incineration. Examples of industrial waste include shredder dust from discarded automobiles, discarded home appliances, vending machines, and office equipment, as well as waste plastics such as construction waste, agricultural waste, fishing waste, and marine waste.

[0013] The moisture content of the incineration ash is preferably 15% by mass or more, more preferably 18% by mass or more, and even more preferably 20% by mass or more, in order to easily enjoy the effects of the present invention. The upper limit of the moisture content is usually 35% by mass or less, and preferably 30% by mass or less.

[0014] Incineration ash is usually less than 40 mm in size when delivered and can be used as is, but from the viewpoints of preventing adhesion and agglomeration and mixing efficiency, it is preferably less than 35 mm, and more preferably less than 30 mm. While there are no particular restrictions on the lower limit of the size of incineration ash, from the viewpoint of production efficiency, it is preferably 0.3 mm or more, more preferably 0.5 mm or more, and even more preferably 1 mm or more. Incineration ash of less than 40 mm in size means that it is a size that can pass through a sieve with 40 mm mesh. In this specification, the size of incineration ash, as well as the waste concrete and mixtures described below, is determined based on the mesh size of the sieve through which the sample has passed.

[0015] Examples of waste concrete include dismantled concrete generated during civil engineering works or the demolition of structures, and surplus concrete generated during the construction of buildings. As the waste concrete, concrete blocks that have been broken into small pieces, magnetically separated, or manually separated for the purpose of separating foreign matter such as reinforcing bars can be used.

[0016] Furthermore, since waste concrete is generally coarser than incineration ash, if the size of the particles is too large and would interfere with mixing, etc., the waste concrete alone may be pre-pulverized before mixing. For example, a crusher can be used for pre-pulverization. Examples of crushers include jaw crushers, impact crushers, hammer crushers, roll crushers, and rotary crushers. In order to adjust the particle size of the waste concrete, the crusher may be equipped with a screen with the desired sieve mesh, or if no screen is equipped, the fixed teeth, rotating teeth, inner wall, etc. may be adjusted to the desired clearance.

[0017] From the viewpoint of mixing efficiency, the size of the waste concrete is preferably less than 40 mm, more preferably less than 35 mm, and even more preferably less than 30 mm. The lower limit of the size of the waste concrete is not particularly limited, but from the viewpoint of production efficiency, it is preferably 0.25 mm or more, more preferably 0.5 mm or more, and even more preferably 1 mm or more.

[0018] The incineration ash and the waste concrete can be mixed using a mixer. The type of mixer is not particularly limited, and examples of mixers that can be used include ribbon mixers, screw mixers, and planetary mixers as fixed container mixers, and horizontal cylindrical mixers and V-type mixers as rotating container mixers. Mixing may also be carried out on the floor using heavy machinery such as a self-propelled cultivator, wheel loader, backhoe, or bulldozer, or by manually turning the material over using a shovel or the like.

[0019] The mixing ratio of incineration ash to waste concrete is not particularly limited, but if there is too much incineration ash, adhesion cannot be prevented, so the mass ratio of the two (waste concrete / incineration ash) is preferably 1 / 7 or more, more preferably 1 / 6 or more, and even more preferably 1 / 5 or more. Also, if there is too much waste concrete, the amount of valuable metals recovered decreases, so the mass ratio of the two (waste concrete / incineration ash) is preferably 10 / 1 or less, more preferably 8 / 1 or less, and preferably 6 / 1 or less.

[0020] [Crushing process] This process involves crushing the mixture obtained in the mixing process, which separates the incineration ash into fused metal and slag phases, and the waste concrete into aggregate and mortar. In this step, for example, a crusher can be used, such as the crusher described above. The particle size may be adjusted by attaching a screen with a desired mesh size to the crusher or by adjusting the clearance of fixed teeth, etc.

[0021] In this step, from the viewpoint of preventing adhesion and agglomeration of incineration ash and separating and recovering valuable materials, it is preferable to crush the mixture to a size of less than 20 mm, and more preferably to a size of less than 15 mm. Note that there is no particular lower limit for the size of the mixture.

[0022] This process may be performed two or more times. For example, the first crushing (primary crushing) is performed for volumetric crushing, and the second crushing (secondary crushing) is performed for surface crushing. By performing surface crushing in the secondary crushing, the metal particles in the incineration ash function as a crushing medium, increasing collisions between particles, separating ash from the metal particles in the incineration ash, and peeling cement paste from the aggregate in the waste concrete. For example, a device capable of breaking down large particles is desirable for the primary crushing, and a jaw crusher, impact crusher, or ball mill can be used. Furthermore, a device capable of peeling off different components attached to the surface of hard particles is desirable for the secondary crushing, and one or more crushers selected from the mechanical abrasion type, screw grinding type, and eccentric rotor type can be used. Examples of mechanical abrasion types include agitator mills, roller mills, ball mills, rod mills, and autogenous grinding mills. The screw grinding type is not particularly limited as long as it scrapes off materials by friction of a rotating screw, and known devices can be used. The eccentric rotor method is not particularly limited as long as it scrapes off material by friction caused by the rotation of the rotor, and any known device may be selected as appropriate. Note that the incineration ash contains large metal lumps and iron wires, which may lead to breakdowns in the crusher, so sieving or magnetic separation can be performed before or after coarse crushing depending on the properties.

[0023] [Cement raw material recovery process] In this process, the crushed material obtained in the crushing process is subjected to one or more of air sorting and sieving, and the lighter materials separated by air sorting and / or the undersized materials separated by sieving are recovered as cement raw materials. Components suitable for cement raw materials are concentrated in the lighter products in air sorting and in the fine particles that undersized in sieving. The heavy materials separated by air sorting and / or the oversized materials separated by sieving are supplied to the next process.

[0024] For the wind sorting, a known wind sorter can be used. The wind sorter is not particularly limited, but examples thereof include a zigzag type and an internal circulation type. In wind separation, for example, when an internal circulation system is used, a fan creates an airflow from bottom to top, causing heavy crushed materials to move downward against the airflow, while lighter crushed materials move upward with the airflow. In this way, the crushed materials are separated into heavy and light materials, and the lighter materials, which contain concentrated cement components, are recovered. In this case, it is preferable to set the wind speed for wind separation so that the heavy products are mainly composed of impurities such as metal and glass. For example, the wind speed is preferably 5 m / s or more, more preferably 7.5 m / s or more, and even more preferably 10 m / s or more. From the perspective of recovering concentrated cement components, it is preferable to set the wind speed to 30 m / s or less, and even more preferably 25 m / s or less.

[0025] The sieve sorting can be performed using a sieve sorter. The sieve sorter is not particularly limited, but examples thereof include a vibrating sieve, an in-plane motion sieve, a rotary sieve, and a fixed sieve. From the viewpoint of recovering concentrated cement components, the sieve openings are usually 0.1 to 10 mm, and can be appropriately selected depending on the size of the crushed material.

[0026] [Metal recovery process] This process is a process in which metals are recovered by subjecting the feed from the cement raw material recovery process, i.e., the heavy materials separated by air separation and / or the surplus materials separated by sieve separation, to one or more methods selected from magnetic separation, eddy current separation, and gravity separation.

[0027] For magnetic separation, a known magnetic separator can be used, and the magnetic separator may be, for example, a drum type, a pulley type, or a hanging type, and is not particularly limited. In magnetic separation, for example, the material fed from the cement raw material recovery process is fed onto a drum with a permanent magnet placed inside, and magnetic materials contained in the material fed from the cement raw material recovery process are attracted to the drum surface, carried by the rotation of the drum, and discharged from the magnetic material discharge port. On the other hand, non-magnetic materials contained in the material fed from the cement raw material recovery process are separated from the drum surface and fall as the drum rotates, and are discharged from the non-magnetic material discharge port. In magnetic separation, iron is selectively recovered. From the viewpoint of recovering magnetically attached materials, the surface magnetic flux density of the magnetic separator is preferably 700 to 10,000 gausses, more preferably 1,000 to 7,500 gausses, and even more preferably 1,500 to 5,000 gausses.

[0028] For eddy current sorting, a known eddy current sorter can be used. The eddy current sorter is not particularly limited, but examples thereof include a rotating magnet type, a direct belt conveyor type, and a rotating cylinder type. In eddy current sorting, for example, a rotating magnet attached to the leading end of a conveyor belt generates an internal induced current due to the electromagnetic induction of the moving magnetic field of the rotating magnet. This generates an internal induced current, which interacts with the moving magnetic field. This applies a thrust in the direction of the rotation of the rotating magnet to the material fed to the leading end of the conveyor belt from the cement raw material recovery process, causing the conductive material to fly out from the surface of the conveyor belt in the direction of the combined force of this thrust and gravity acting on the conductive material, thereby separating conductive and non-conductive materials. In eddy current sorting, aluminum is selectively recovered. From the viewpoint of recovering conductive materials, the rotation speed of the rotary magnet body is preferably 1500 rpm or more, more preferably 3000 rpm or more, and even more preferably 4500 rpm or more.

[0029] The gravity separation can be performed using a known gravity separator. The gravity separator may be either a dry type or a wet type, but a dry type table type gravity separator is preferred, and an air table is more preferred. In gravity separation, for example, when an air table is used, the material from the cement raw material recovery process that is supplied to the top surface of the vibrating table is floated off the top surface of the vibrating table by the air flow passing through the vibrating table. Vibration applied in the tilting direction of the vibrating table causes heavy products with a high specific gravity to move to the bottom layer and light products with a low specific gravity to move to the top layer. The heavy products in the bottom layer are subjected to frictional and vibrational forces from the top surface of the vibrating table and move diagonally upward, while the light products in the top layer are swept diagonally downward without being subjected to frictional and vibrational forces from the top surface of the vibrating table. The heavy and light products are then separately discharged from the vibrating table. Gravity separation selectively recovers heavy metals such as copper and precious metals. In particular, gravity separation may be carried out by dividing the particles into a plurality of particle sizes by sieving, and performing gravity separation for each particle group, in order to improve the separation accuracy.

[0030] A preferred embodiment of this step is shown in Figure 1. Hereinafter, a detailed explanation will be given with reference to the drawing. The feed (coarse particles) from the cement raw material recovery process, i.e., the heavy particles separated by air separation and / or the oversized particles separated by sieve separation, is first subjected to magnetic separation as shown in Figure 1. Magnetic separation separates the material into magnetized and non-magnetized materials, and iron scrap is recovered as the magnetized material. Next, the non-magnetic materials separated by magnetic separation are subjected to eddy current separation, which separates the non-magnetic metals from the non-metals, and the non-metals are recovered as recycled aggregate and roadbed material. Next, the non-magnetic metals separated by eddy current sorting are subjected to gravity sorting, which separates them into heavy and light materials, recovering aluminum as the light material and copper and precious metals as the heavy material.

[0031] As explained above, in the present invention, by simultaneously treating incineration ash and waste concrete, which are waste materials, it is possible to efficiently separate and recover valuable materials contained in the waste materials while preventing adhesion and agglomeration of the incineration ash.

[0032] [Agent and method for preventing adhesion or aggregation of incineration ash] The incineration ash adhesion inhibitor or anti-aggregation agent of the present invention contains crushed waste concrete as an active ingredient. The incineration ash adhesion or anti-aggregation method of the present invention involves mixing incineration ash with crushed waste concrete. The effect of preventing adhesion or agglomeration of incineration ash of the present invention is manifested when incineration ash and crushed waste concrete coexist. Therefore, the crushed waste concrete may be pre-crushed, or the incineration ash and waste concrete may be mixed and crushed to form the waste concrete in the form of crushed material. The size of the mixture in which both coexist is preferably less than 20 mm, more preferably less than 15 mm, with no particular lower limit. The specific composition of the incineration ash and waste concrete is as described above.

[0033] The mixing ratio of incineration ash to waste concrete is not particularly limited, but if there is too much incineration ash, adhesion cannot be prevented, so the mass ratio of the two (waste concrete / incineration ash) is preferably 1 / 7 or more, more preferably 1 / 6 or more, and even more preferably 1 / 5 or more. Also, if there is too much waste concrete, the amount of valuable metals recovered will be insufficient, so the mass ratio of the two (waste concrete / incineration ash) is preferably 10 / 1 or less, more preferably 8 / 1 or less, and preferably 6 / 1 or less. [Example]

[0034] The following examples will explain the present invention in more detail, but the present invention is not limited to the examples below.

[0035] The samples used in this example are as follows: (1) Municipal waste incineration ash with a moisture content of 10%, 20%, or 30% by mass and a particle size of less than 10 mm (2) Waste concrete with particle size of 1.2 mm or more and less than 5.0 mm

[0036] Example 1 Municipal waste incineration ash with a moisture content of 20% by mass was mixed with waste concrete in a mass ratio (waste concrete / incineration ash) of 1:5, and the mixture was crushed. Crushing was carried out by placing 350 g of the mixture and 1.5 kg of 10 mm diameter balls in a stainless steel pot mill, placing it on a pot mill rotating table (ANZ-51D, manufactured by Nitto Scientific Co., Ltd.), and operating the rotating table at a speed of 100 rpm for 1 hour. After crushing, the mixture was removed from the pot mill, and the ratio of the recovered amount to the initial amount (350 g) (recovery rate) was calculated. The results are shown in Table 1.

[0037] Example 2 The same procedures as in Example 1 were carried out except that the mass ratio of municipal waste incineration ash to waste concrete (waste concrete / incineration ash) was changed to 1 / 1, and the recovery rate was calculated. The results are shown in Table 1.

[0038] Example 3 The recovery rate was calculated in the same manner as in Example 1, except that municipal waste incineration ash with a moisture content of 30% by mass was used and the mass ratio of municipal waste incineration ash to waste concrete (waste concrete / incineration ash) was changed to 5 / 1. The results are shown in Table 1.

[0039] Comparative Example 1 The same procedure as in Example 1 was repeated except that only municipal waste incineration ash with a moisture content of 10% by mass was used, and the recovery rate was calculated. The results are shown in Table 1.

[0040] Comparative Example 2 The same procedure as in Example 1 was repeated except that only municipal waste incineration ash with a moisture content of 20% by mass was used, and the recovery rate was calculated. The results are shown in Table 1.

[0041] [Table 1]

[0042] In Comparative Example 1, the moisture content of the incineration ash was low, and the incineration ash did not adhere to the container very much, so it was possible to recover it at a high yield. In contrast, in Examples 1 to 3, although incineration ash with a moisture content more than twice that of Comparative Example 1 was used, it was possible to recover it at a higher yield than in Comparative Example 2, in which waste concrete was not mixed. Therefore, it can be seen from Table 1 that by mixing incineration ash with waste concrete, it is possible to reduce the adhesion of incineration ash to the container.

[0043] The mixtures recovered in Examples 1 to 3 and Comparative Examples 1 and 2 were each sieved to evaluate the presence or absence of agglomeration. Specifically, sieves with mesh sizes of 9.5 mm, 4.75 mm, 2.36 mm, 1.18 mm, 0.6 mm, 0.3 mm, or 0.15 mm were used, and the presence or absence of agglomeration was evaluated using the mesh size that allowed sieving as an index. In the "evaluation of the presence or absence of agglomeration," sieving was not only judged to be impossible when agglomeration occurred and sieving was not possible with the specified mesh size, but also when clogging occurred and particles that should have fallen through the sieve did not fall through the sieve. The results are shown in Table 2.

[0044] [Table 2]

[0045] In Comparative Example 1, the moisture content of the incineration ash was low, and there was little agglomeration or clogging, so sieving was possible to a certain extent even with small sieve openings. In contrast, in Examples 1 to 3, although incineration ash with a moisture content more than twice that of Comparative Example 1 was used, it was possible to sieve it with smaller sieve openings than in Comparative Example 2, which did not mix with waste concrete. Therefore, it can be seen from Table 2 that mixing incineration ash with waste concrete suppresses the agglomeration of incineration ash.

[0046] To evaluate the reusability of each sieved particle group as a cement raw material, the calcium content (calculated as CaO) was determined by total element analysis using X-ray fluorescence analysis (XRF). The results are shown in Table 3.

[0047] [Table 3]

[0048] It can be seen from Table 3 that CaO is contained in large amounts in the finer particle groups. Therefore, it can be seen that Examples 1 to 3, in which a larger amount of fine particle groups is recovered, can selectively recover cement raw materials without mixing in aggregate.

Claims

1. A mixing process of mixing incineration ash and waste concrete having a size of 1 mm or more and less than 40 mm in a mass ratio (waste concrete / incineration ash) of 1 / 1 or more and 6 / 1 or less; a crushing step of crushing the mixture obtained by the mixing step; a cement raw material recovery step of subjecting the crushed material obtained in the crushing step to one or more selected from air sorting and sieve sorting, supplying heavy materials separated by air sorting and / or oversized materials separated by sieve sorting to a next step, and recovering light materials separated by air sorting and / or undersized materials separated by sieve sorting as cement raw materials; a metal recovery step in which the feed from the cement raw material recovery step is subjected to one or more methods selected from magnetic separation, eddy current separation, and gravity separation to recover metals; A method for treating waste, including:

2. The metal recovery step includes a first step of magnetically separating the material supplied from the cement raw material recovery step into magnetically separated and non-magnetic materials, recovering iron scrap as the magnetic materials, and supplying the non-magnetic materials to a subsequent step; a second step of separating the non-magnetic material from the first step by eddy current sorting into non-magnetic metals and non-metals, recovering recycled aggregate and / or roadbed material as the non-metals, and supplying the non-magnetic metals to the next step; 2. The method for treating waste according to claim 1, further comprising a third step of gravity separating the non-magnetic metals from the second step into heavy products and light products, recovering precious metals as the heavy products and aluminum as the light products.

3. 3. The method for treating waste according to claim 1 or 2, wherein the size of the incineration ash is less than 40 mm.

4. The method for treating waste according to any one of claims 1 to 3, wherein the moisture content of the incineration ash is 15% by mass or more.

5. 5. The method for treating waste according to claim 1, wherein the mixture is crushed to a size of less than 20 mm in the crushing step.

6. An anti-adhesion agent or anti-aggregation agent for incineration ash, which contains crushed waste concrete having a size of 1 mm or more but less than 40 mm as an active ingredient, An anti-adhesion agent or anti-aggregation agent for incineration ash, which is used by mixing incineration ash and waste concrete in a mass ratio (waste concrete / incineration ash) of 1 / 1 or more and 6 / 1 or less.

7. A method for preventing adhesion or agglomeration of incineration ash by mixing incineration ash with crushed waste concrete having a size of 1 mm or more but less than 40 mm in a mass ratio (waste concrete / incineration ash) of 1 / 1 or more and 6 / 1 or less.

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