JP6791726B2 - Processing method - Google Patents

Description

The present invention relates to a processing method.

In recent years, incineration ash of general household waste has been subjected to treatments such as drying, magnetic force sorting, sieving, crushing, and eddy current sorting, and the incineration ash after treatment has been removed from the incineration ash to remove cement raw materials and iron components. A technique for recovering valuable metals such as copper, zinc, gold, silver, palladium, and platinum from the residue obtained by pulverizing and classifying with a mill has been proposed (see, for example, Patent Document 1 and the like).

Further, Patent Document 2 discloses a method using an air table as a method for recovering valuable resources from a waste lithium ion secondary battery. Lithium-ion secondary batteries have identified inclusions such as lithium (Li), cobalt (Co), nickel (Ni), aluminum (Al), and copper (Cu), so valuable resources can be sorted relatively easily. It can be performed.

Further, in Patent Document 3, crushed products of waste home appliances are screened, magnetically sorted on the sieve, and non-magnetic particles are sorted into metal and non-metal by eddy current sorting, and the metal is described. Material and non-metal materials are color-sorted to select mounting board scraps containing valuable metals, and mounting parts containing valuable metals are further separated from the mounting board scraps using a parts peeling device (part separator). Disclosed is a method of classifying the mounted component into three types, sorting by specific gravity, and recovering valuable metal from the mounted component. In Patent Document 3, a dry specific gravity sorter (air table), a jig sorter, a wet thin flow sorter, and a centrifuge are disclosed as specific gravity sorters. Further, as for the air table, an air table capable of performing specific gravity sorting called a uniaxial type with a unidirectional inclination is disclosed. In specific gravity sorting, light products that float due to wind power are difficult to transmit the vibration of the table and move downward along the slope, but heavy products that do not float due to wind power move upward due to vibration, so light products and heavy products Can be sorted.

Further, Patent Document 4 discloses a sorting process using a biaxial air table for crushing waste household appliances and particularly for sorting coated copper wire and plastic, and the coated copper wire having a similar specific gravity. It is stated that plastics can be sorted accurately.

Japanese Unexamined Patent Publication No. 2016-89196 JP-A-2015-170480 Japanese Unexamined Patent Publication No. 2013-685 Japanese Unexamined Patent Publication No. 2003-320311

When sorting a residue composed of a specific material such as a waste lithium ion secondary battery as in Patent Document 2 using an air table, the element to be sorted is known in advance. In particular, aluminum is melted to form a molten mass, and copper is heat-treated at a treatment temperature that can maintain the shape of copper foil, and aluminum is used as a heavy product and copper foil is used as a light product. Therefore, the effect of shape selection by air (wind power) tends to be large, and the effect of specific gravity selection tends to be small.

In the case of Patent Document 3, the crushed material of waste home appliances is sorted into mounting parts of 6 mm or more through various sorting processes, and the crushed material is sorted by a uniaxial air table, which is a heavy product. Heavy metals such as Ta, W, Nd, Nb, Bi, Ni, Au, and Pd are selected for light products, and plastics are selected for light products. As described above, the sorting method of Patent Document 3 is effective when the difference in specific gravity is large.

In the case of Patent Document 4, a biaxial air table is used for sorting a linear coated copper wire and a flat-shaped plastic, and the specific gravity sortability by a vibrating sieve and the shape sortability by a wind force are utilized. It is said that coated copper wire and plastic can be sorted, but the sortability is effective only for plastics with a flat shape, and it is suitable for sorting finely crushed crushed products and sized ones. Is stated to be unsuitable.

On the other hand, when the incineration ash of general household waste is sorted and processed as in the present invention, the shape of the incineration ash itself is diverse, and the components contained in the incineration ash residue have not been identified in advance. For this reason, it is difficult to select crushed products having various elements, particle sizes, and shapes simply by putting the residue on the air table as it is, and further, crushed products composed of a plurality of elements are easily entangled with each other. , It is difficult to efficiently select a specific metal.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a treatment method capable of efficiently removing aluminum from a residue obtained by removing a cement raw material from incineration ash of general household waste. ..

The treatment method of the present invention includes a sieving step of sieving the residue obtained by removing the cement raw material from the incineration ash of general household waste with a sieve having a sieve mesh of 8 to 12 mm, and sieving under a sieve having a sieve mesh of 8 to 12 mm. The residue is further sieved with a sieve having a sieve size of 3 to 5 mm, and each of the residue on the sieve and the residue under the sieve having a sieve mesh of 3 to 5 mm is generated from the surface to generate air and vibrate reciprocally. by performing the gravity separation and shape selected using, seen including a separation step of separating the aluminum and other, a gravity separation and shape sorting the sieve mesh is for residue on a sieve of sieve 3~5mm, the This is a treatment method that is carried out under conditions where the air velocity is higher than that of specific gravity sorting and shape sorting for the residue under the sieve.

The treatment method of the present invention has an effect that aluminum can be efficiently removed from the residue obtained by removing the cement raw material from the incineration ash of general household waste.

It is a process drawing which shows the processing method which concerns on one Embodiment. It is a perspective view which shows the air table. FIG. 3A is a table showing the composition before and after the air table treatment (under the sieve sieved with a sieve mesh of 10 mm and above the sieve sieved with a sieve mesh of 3 mm; particle size of about 3 to 10 mm). b) is a table showing the composition before and after the air table treatment (under a sieve separated by a sieve mesh of 3 mm; particle size of about 0 to 3 mm). In sieving the light weight aluminum and the heavy weight metal using an air table, the treatment conditions for the residue having a particle size of about 3 to 10 mm were compared with the treatment conditions for the residue having a particle size of about 0 to 3 mm. It is a table which shows the correlation of the conditions of suitable "air wind speed" "frequency" "tilt angle" in the case.

Hereinafter, one embodiment will be described in detail with reference to FIGS. 1 to 4. FIG. 1 is a process diagram showing a processing method according to an embodiment.

In the present embodiment, the incinerated ash of general household waste is subjected to processing such as drying, magnetic force sorting, sieving, crushing, and eddy current sorting, and the iron component, aluminum component, and cement raw material component in the incinerated ash are added. Except for most, the residue obtained by grinding and classifying with a roller mill is treated. By this treatment, valuable metals such as copper, gold, silver, palladium, and platinum contained in the residue are recovered.

As shown in FIG. 1, the residue is first sieved using three types of sieves. Here, the three types of sieves include a sieve having a sieve mesh diameter of 14 to 18 mm (16 mm in the present embodiment), a sieve having a sieve mesh diameter of 8 to 12 mm (10 mm in the present embodiment), and a sieve mesh. Includes a sieve having a diameter of 3-5 mm (3 mm in this embodiment). By sieving the residue using these three types of sieves, as shown in FIG. 1, on the sieve sieved with a sieve mesh of 16 mm; sieve under the sieve sieved with a sieve size of 16 mm or more and a sieve mesh of 16 mm. On a sieve separated by 10 mm; on a sieve sieved by a sieve mesh of about 10 to 16 mm and a sieve mesh of 10 mm; on a sieve sieved by a sieve mesh of 3 mm; a sieve sieved by a sieve particle of about 3 to 10 mm and a sieve mesh of 3 mm. Bottom: It can be divided into four types with a particle size of about 0 to 3 mm. In the present invention, the notation "degree" in the description of the particle size means the particle size of the residue existing on and under the sieve when sieved according to each mesh size. To do. Further, regarding the notation of "particle size of about 0 to 3 mm", in reality, there is no residue of 0 mm size, but the range of the particle size of the residue under the sieve having a size larger than 0 mm and up to about 3 mm is defined. , For convenience of description, it shall be expressed as "particle size 0 to 3 mm".

The reason why a sieve having a mesh diameter of 16 mm is used is that if the residue has a particle size of 16 mm or more, the separability of stainless steel (for example, wire scraps, spoons, etc.) can be improved. Further, the reason why a sieve having a mesh diameter of 10 mm is used is that the upper limit of the processable particle size in an air table having a specific gravity sorting and shape sorting functions described later is about 10 mm. Further, the reason why a sieve having a mesh diameter of 3 mm is used is that it is preferable to divide the sieve into 3 to 10 mm and 0 to 3 mm and treat them under different treatment conditions as the treatment conditions for specific gravity sorting and shape sorting (air table). This is because the valuable metal is concentrated in the residue to a particle size of about 0 to 3 mm.

Next, a method for treating the residue for each particle size will be described with reference to FIG.

(Regarding the treatment of residues with a particle size of 16 mm or more)
For the residue having a particle size of 16 mm or more (on the sieve obtained by sieving using a sieve having a mesh diameter of 16 mm), a picking process is performed as shown in FIG. In this case, for example, by hand sorting, objects having a specific external shape, such as stainless steel such as wire chips and spoons, and incinerated ash in the form of lumps are sorted and excluded. In addition, not only manual selection but also color selection may be performed. The color selection is a method in which the residue is photographed with a camera, the picking object is automatically identified based on the color and shape, and the identified picking object is selected by a spatula, a pressure wave with increased air pressure, or the like. Stainless steel and incinerated ash sorted from the residue are sold outside as iron scrap. On the other hand, the residue (including aluminum and other metals) from which stainless steel and ingot incineration ash have been sorted and removed is subjected to the same treatment as the residue having a particle size of about 10 to 16 mm.

(Regarding the treatment of residues with a particle size of about 10 to 16 mm)
Residues having a particle size of about 10 to 16 mm (on the sieve obtained by sieving using a sieve having a mesh diameter of 10 mm) are directly put into a melting furnace. In this case, the aluminum can be melted and slagged to be removed from the system. The furnace used for melting is not specified, but a melting furnace capable of melting the residue to form metal and slag and separating them is desirable. Specifically, a furnace that directly smelts blister copper (black copper, etc.), for example, a melting furnace such as a tilting reflection furnace, a shaft furnace with a hearth, an oval furnace, a drum furnace, and an upper blowing type converter. can give.

When the aluminum content (processing amount) is large, the processing amount of the aluminum-containing slag is large, and the operation load of the melting furnace becomes large. In this case, as a pretreatment for the residue having a particle size of about 10 to 16 mm, a known treatment capable of selecting aluminum and other pulverized products can be performed. For example, as pretreatment, known treatments such as specific gravity sorting, shape sorting, eddy current sorting, sorter sorting (optical, electromagnetic induction, transmitted X-ray, fluorescent X-ray, etc.), dry melting, wet melting, and manual sorting by appearance are performed. Can be adopted.

(Regarding the treatment of residues with a particle size of about 3 to 10 mm)
For the residue having a particle size of about 3 to 10 mm (on the sieve obtained by sieving using a sieve having a mesh diameter of 3 mm), a combination of specific gravity sorting and shape sorting is preferably performed using an air table. Are to be done at the same time. In the present embodiment, the air table is a kind of dry specific gravity sorter, and by using the functions of specific gravity sorting and shape sorting by the buoyancy due to vibration and air and the inclination of the table, a light product having a small specific gravity and a specific gravity are used. A device that sorts large heavy products.

FIG. 2 shows a perspective view of the air table 10 used in the present embodiment.

The air table 10 has a table 12, and a residue is charged onto the upper surface of the table 12 as shown by an arrow C. In the table 12, the first axial direction in the surface (Y-axis direction in FIG. 2) and the second axial direction (X-axis direction) orthogonal to the first axial direction (Y-axis direction) in the surface are horizontal planes. It is arranged so as to incline with respect to it. It is assumed that the angle between the X-axis direction and the horizontal plane is θ, and the angle between the Y-axis direction and the horizontal plane is ψ.

Further, a plurality of blowout holes are formed on the surface of the table 12 at predetermined intervals, and air is blown out from the blowout holes toward the upper side in the vertical direction to form an air flow. Further, the table 12 is reciprocally vibrated in the direction of the double-headed arrow (X-axis direction) by a driving device (not shown).

In the air table 10, as shown by an arrow C, the residue is charged from one end in the Y-axis direction (the end on the higher side), so that specific gravity sorting and shape sorting can be performed by air flow and reciprocating vibration. Will be executed. That is, in general, a heavy object is not easily affected by the air flow and is carried by the vibration motion, so that the heavy object falls to the position indicated by the arrow A in FIG. On the other hand, since the lightweight object floats under the influence of the air flow, the friction on the surface of the table 12 is reduced, and the lightweight object is transported by the vibration motion while moving along the inclination of the table 12, and therefore, FIG. It falls to the position indicated by the arrow B of. Further, when an object that is not easily affected by the air flow, such as a thick object or a spherical object, is put on the table 12, the behavior is similar to that of a heavy object even if the specific gravity is small. Therefore, by using the air table 10, it is possible to drop aluminum (hereinafter referred to as a light ratio) which is lightweight and has a shape relatively easily affected by an air flow to the position indicated by the arrow B. On the other hand, the other residue (hereinafter referred to as a heavy specific substance) has a shape that is relatively insensitive to a heavy object or an air flow, and therefore can be dropped to the position indicated by the arrow A. Therefore, by using the shape sorting and the specific gravity sorting together as in the present embodiment, it is possible to sort aluminum and other residues.

In this embodiment, the air velocity is 2.7 to 2.9 m / s, the frequency is 500 to 540 rpm, and the X-axis is used for specific gravity sorting and shape sorting for a residue having a particle size of about 3 to 10 mm. The inclination angle θ with respect to the horizontal plane in the direction is set to 9 to 11 °, and the inclination angle ψ with respect to the horizontal plane in the Y-axis direction is set to 8 to 10 °, more preferably 8.5 to 9.5 °.

FIG. 3A shows an example of the composition of the residue before and after the treatment when the residue having a particle size of about 3 to 10 mm is charged into the air table 10. In FIG. 3A, a residue having a particle size of about 3 to 10 mm is charged into the air table 10 and the specific gravity sorting and the shape sorting are performed at the same time to increase the aluminum (Al) content from 25% to 2%. You can see that it was done.

Actually, the residue of the air table 10 is a light ratio (aluminum), a heavy ratio (valuable metal), and a residue that is not sorted (residue falling from the vicinity of the center of the air table 10; unsorted). (Things) and (see Fig. 1). In the present invention, the valuable metal means copper (Cu), gold (Au), silver (Ag), platinum (Pt), and palladium (Pd), which are shown in FIGS. 3 (a) and 3 (b). ) In the table, copper is shown separately from other valuable metals.

In this case, as shown in FIG. 1, the light ratio (aluminum) is subjected to the same treatment as the residue having a particle size of about 10 to 16 mm. Further, for the residue (unsorted product) that is not sorted by any of them, the specific gravity sorting and the shape sorting are repeatedly executed. For heavy weight products (valuable metals), the process shifts to a process in which valuable metals can be recovered. As a step in which the valuable metal can be recovered, the valuable metal may be recovered by a treatment step including a dry treatment using a melting furnace, or a heavy specific substance may be directly dissolved in an acidic solution or an alkaline solution to neutralize and precipitate, or an adsorbent. Valuable metals may be recovered by wet treatment such as treatment.

The type of melting furnace used in the dry treatment is not limited, but it is sufficient that the molten metal can be cast. For example, a self-melting furnace, a converter used in a copper smelting process, an electric furnace, and other furnaces that can be used for treating the above-mentioned residue having a particle size of about 10 to 16 mm (tilt type reflection furnace, with a hearth). A shaft furnace, an oval furnace, a drum furnace, an upper blowing type converter, etc.) may be used separately to melt and cast a residue having a particle size of about 0 to 10 mm. The cast ingot can recover valuable metals through known methods such as electrolytic refining, electrowinning, and wet treatment of electrolytic starch.

A typical example of a dry process for recovering valuable metals is copper smelting. In copper smelting, copper is obtained by smelting from copper ore (copper concentrate), and at the same time, other valuable metals contained in the ore are used as electrolytic deposits generated by copper electrolytic refining, and the recovery process of each valuable metal is performed. It is collected afterwards.

Therefore, if a residue having a particle size of about 0 to 10 mm is put into a flash smelting furnace or converter used for copper smelting, the valuable metal in the residue is recovered together with the valuable metal in the ore.

It is also effective to sift the residue having a particle size of about 0 to 10 mm using a sieve having a mesh diameter of 3 mm. The reason for sieving is that the treatment conditions for specific gravity sorting and shape sorting (air table) are preferably divided into 3 to 10 mm and 0 to 3 mm and treated under different treatment conditions.

The heavy ratio material (valuable metal) may be separately charged into a melting furnace similar to the one used when treating a residue having a particle size of about 10 to 16 mm. Here, the melting furnace means, for example, a tilting reverberatory furnace, a shaft furnace with a hearth, an oval furnace, a drum furnace, an upper blowing type converter, and the like.

As described above, the valuable metal can be recovered from the heavy weight material.

(Regarding the treatment of residues with a particle size of about 0 to 3 mm)
For the residue having a particle size of about 0 to 3 mm (under the sieve obtained by sieving using a sieve having a mesh diameter of 3 mm), the same treatment as the above-mentioned residue having a particle size of about 3 to 10 mm is executed. Will be done.

In the specific gravity sorting and shape sorting of the residue having a particle size of about 0 to 3 mm, the wind speed of the air from the air table is made smaller than in the case of the specific gravity sorting and shape sorting of the residue having a particle size of about 3 to 10 mm. , Increase the frequency and decrease the tilt angle. For example, when sorting the specific gravity and shape of a residue having a particle size of about 0 to 3 mm, the wind speed of air is 2.2 to 2.4 m / s, the frequency is 554 to 586 rpm, and the inclination with respect to the horizontal plane in the X-axis direction. The angle θ is set to 9 to 11 °, and the inclination angle ψ with respect to the horizontal plane in the Y-axis direction is set to 6.5 to 8.5 °, more preferably 7.0 to 8.0 ° (see Example 7 in FIG. 4). ).

FIG. 3B shows an example of the composition of the residue before and after the treatment when the residue having a particle size of about 0 to 3 mm is charged into the air table 10. In FIG. 3B, a residue having a particle size of about 0 to 3 mm is charged into the air table 10 and the specific gravity sorting and the shape sorting are performed at the same time to increase the aluminum (Al) content from 18% to 3%. You can see that it was done.

The residue having a particle size of about 0 to 3 mm can be divided into a light ratio (aluminum), a heavy ratio (valuable metal), and a residue that is not sorted by the treatment using the air table 10 described above. Divided. For the light ratio (aluminum), the same treatment as for the residue having a particle size of about 10 to 16 mm is carried out. Further, for the residue (unsorted product) that is not sorted by any of them, the specific gravity sorting and the shape sorting are repeatedly executed. Further, the heavy weight material (valuable metal) is shifted to a step in which the valuable metal can be recovered in the same manner as the heavy weight material (valuable metal) obtained by treating the residue having a particle size of about 3 to 10 mm. As a step in which the valuable metal can be recovered, the valuable metal may be recovered by a treatment step including a dry treatment using a melting furnace, or a heavy specific substance may be directly dissolved in an acidic solution or an alkaline solution to perform a neutralization precipitation treatment or an adsorbent. Valuable metals may be recovered by wet treatment such as treatment.

In the present embodiment, aluminum is excluded from the residue having a particle size of about 3 to 10 mm and the residue having a particle size of about 0 to 3 mm, and the residue after the aluminum is removed is used as a melting furnace (a self-melting furnace for copper smelting). Since it is put into a converter, an electric furnace, a tilting reverberatory furnace, etc.), it is possible to suppress an increase in the amount of aluminum-containing slag generated in the melting furnace and prevent an increase in the operating load of the melting furnace. Further, if the aluminum content (treatment amount) in the residue is large, the aluminum increases the viscosity of the slag, which leads to deterioration of the fluidity of the slag, and it becomes difficult to continuously tap the slag in the melting furnace, which is not preferable. Therefore, selective removal of aluminum in the residue is important.

As described in detail above, according to the present embodiment, the residue obtained by removing the cement raw material from the incineration ash of general household waste is sieved with a sieve having a mesh size of 10 mm, and the sieve is sieved using air flow and vibration. By combining (simultaneously) specific gravity sorting and shape sorting on the residue below, aluminum and others are separated. As described above, by performing (simultaneously) the specific gravity sorting and the shape sorting on the residue having a particle size of about 10 mm or less, aluminum, which is a light ratio, can be effectively sorted from the residue. For example, as a result of sorting under the conditions of the present embodiment, the distribution ratio of aluminum was 85 to 93%. In the present embodiment, the distribution ratio means the ratio of the weight of each element contained in the light ratio to the weight of each element contained in the raw material before selection.

Further, in the present embodiment, the air table 10 is used for specific gravity sorting and shape sorting, and the table 12 has a first axial direction (Y-axis direction) in the surface and a second axial direction (Y-axis direction) in the surface orthogonal to the Y-axis direction. The X-axis direction) is arranged so as to be inclined with respect to the horizontal plane. Then, the residue is supplied to the vicinity of the end portion of the table 12 on the side where the height in the Y-axis direction is high, the table 12 is reciprocated in the X-axis direction, and an air flow is generated from the surface toward the upper side in the vertical direction. As a result, the residue is separated into a high side and a low side in the X-axis direction in the vicinity of the end portion of the table 12 on the low side in the Y-axis direction. In this way, the biaxial direction of the surface of the table 12 is tilted with respect to the horizontal plane, and aluminum and other residues are separated by using vibration and air flow to easily and efficiently sort aluminum. Can be done.

Further, in the present embodiment, the residue having a particle size of about 10 mm or less is further sieved using a sieve having a mesh size of 3 mm, and the specific gravity is sorted on and under the sieve after sieving under different conditions. It is preferably performed at the same time in combination with shape selection. As a result, sorting can be performed more efficiently by setting the air table conditions according to the particle size. Here, in the step of processing "combining the specific gravity selection and the shape selection", the specific gravity selection and the shape selection do not necessarily have to be performed at the same time. For example, in the vicinity of the upper part of the table 12 in FIG. 2, the wind speed of air is set to zero and sorting is performed only by vibration and inclination, and below the middle stage of the table 12, in addition to vibration and inclination, air is ejected and sorted. You may. As described above, the case where only the specific gravity sorting is performed above the table and the specific gravity sorting and the shape sorting are performed at the same time below the table is also included in the process of "combining the specific gravity sorting and the shape sorting".

In the above embodiment, the residue having a particle size of about 3 to 10 mm and the residue having a particle size of about 0 to 3 mm are treated using an air table under different conditions, but the present invention is limited to this. It is not something that can be done. For example, a residue having a particle size of about 10 mm or less may be treated using one air table.

Further, in the above embodiment, the case where the residue after sieving using a sieve having a mesh diameter of 16 mm is sieved using a sieve having a mesh diameter of 10 mm and 3 mm has been described. It is not limited. For example, the residue may be sieved using only a sieve having a mesh diameter of 10 mm and 3 mm, and each sieved residue may be treated differently.

In the above embodiment, the air velocity is increased in the specific gravity sorting and shape sorting of the residue having a particle size of about 3 to 10 mm as compared with the specific gravity sorting and shape sorting of the residue having a particle size of about 0 to 3 mm. The case where the implementation is performed under the condition that the frequency is reduced and the inclination angle is increased (see Example 7 in FIG. 4) has been described, but the present invention is not limited to this. For example, the conditions for specific gravity sorting and shape sorting of a residue having a particle size of about 3 to 10 mm are such that the magnitude relationship between the frequency and the inclination angle is arbitrary as long as the air velocity is made larger than that in the case of a particle size of about 0 to 3 mm. It may be present (see Examples 1 to 9 in FIG. 4). Further, the conditions for specific gravity sorting and shape sorting of the residue having a particle size of about 3 to 10 mm are the same as when the air velocity is about 0 to 3 mm, and the frequency is higher than when the particle size is about 0 to 3 mm. If it is made smaller, the magnitude relation of the inclination angle may be arbitrary (see Examples 12 to 14 in FIG. 4). Further, the conditions for specific gravity sorting and shape sorting of the residue having a particle size of about 3 to 10 mm are such that when the wind speed and frequency of the air are the same as those of the case where the particle size is about 0 to 3 mm, the inclination angle is set to 0. It may be larger than the case of about 3 mm (see Example 11 in FIG. 4). Furthermore, the conditions for specific gravity sorting and shape sorting of residues having a particle size of about 3 to 10 mm are such that when the air velocity is the same as when the particle size is about 0 to 3 mm, the frequency and inclination angle are set to the particle size. It may be larger than the case of about 0 to 3 mm (see Example 10 in FIG. 4). FIG. 4 shows the treatment conditions for the residue having a particle size of about 3 to 10 mm for selecting aluminum as a light weight and valuable metals as a heavy weight by an air table obtained by the present invention. It shows the correlation of suitable "air wind speed", "frequency", and "tilt angle" conditions when compared with the treatment conditions for a residue of about 3 mm. In FIG. 4, the distribution ratio of aluminum is indicated by ⊚ for 80% or more, ◯ for 50% or more and less than 80%, Δ for 30% or more and less than 50%, and × for less than 30%.

The embodiments described above are examples of preferred embodiments of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention.

10 air table

Claims (9)

A sieving process in which the residue obtained by removing the cement raw material from the incineration ash of general household waste is sieved with a sieve having a mesh size of 8 to 12 mm.
The residue under the sieve of the sieve having a sieve of 8 to 12 mm is further sieved with a sieve having a sieve of 3 to 5 mm, and the residue on the sieve of the sieve having a sieve of 3 to 5 mm and the residue under the sieve are respectively separated. , by performing the gravity separation and shape selection using an air table for reciprocal vibration generates air from the surface, seen including a separation step of separating the aluminum and other, and
The specific gravity sorting and shape sorting of the residue on the sieve of the sieve having a mesh size of 3 to 5 mm are performed under a condition where the air velocity is higher than that of the specific gravity sorting and shape sorting of the residue under the sieve. processing method. A sieving process in which the residue obtained by removing the cement raw material from the incineration ash of general household waste is sieved with a sieve having a mesh size of 8 to 12 mm.
The residue under the sieve of the sieve having a sieve of 8 to 12 mm is further sieved with a sieve having a sieve of 3 to 5 mm, and the residue on the sieve of the sieve having a sieve of 3 to 5 mm and the residue under the sieve are respectively separated. Includes a separation step that separates aluminum and others by performing specific gravity sorting and shape sorting using an air table that generates air from the surface and vibrates reciprocatingly.
The specific gravity sorting and shape sorting for the residue on the sieve by the sieve having a mesh size of 3 to 5 mm have the same specific gravity sorting and shape sorting for the residue under the sieve and the air velocity of air, and the specific gravity sorting for the residue under the sieve. A processing method characterized in that it is executed under conditions where the frequency of reciprocating vibration is smaller than that of shape selection. A sieving process in which the residue obtained by removing the cement raw material from the incineration ash of general household waste is sieved with a sieve having a mesh size of 8 to 12 mm.
The residue under the sieve of the sieve having a sieve of 8 to 12 mm is further sieved with a sieve having a sieve of 3 to 5 mm, and the residue on the sieve of the sieve having a sieve of 3 to 5 mm and the residue under the sieve are respectively separated. Includes a separation step that separates aluminum and others by performing specific gravity sorting and shape sorting using an air table that generates air from the surface and vibrates reciprocatingly.
The first axial direction in the surface of the air table and the second axial direction in the surface orthogonal to the first axial direction are arranged so as to be inclined with respect to the horizontal plane.
The specific gravity sorting and shape sorting for the residue on the sieve with the sieve having a mesh size of 3 to 5 mm have the same specific gravity sorting and shape sorting for the residue under the sieve, the air velocity and the frequency of the reciprocating vibration, and the sieve. A treatment method characterized in that it is carried out under a condition that the inclination angle with respect to at least one horizontal plane in the first axial direction and the second axial direction is larger than that of specific gravity sorting and shape sorting for the residue below. A sieving process in which the residue obtained by removing the cement raw material from the incineration ash of general household waste is sieved with a sieve having a mesh size of 8 to 12 mm.
The residue under the sieve of the sieve having a sieve of 8 to 12 mm is further sieved with a sieve having a sieve of 3 to 5 mm, and the residue on the sieve of the sieve having a sieve of 3 to 5 mm and the residue under the sieve are respectively separated. Includes a separation step that separates aluminum and others by performing specific gravity sorting and shape sorting using an air table that generates air from the surface and vibrates reciprocatingly.
The first axial direction in the surface of the air table and the second axial direction in the surface orthogonal to the first axial direction are arranged so as to be inclined with respect to the horizontal plane.
The specific gravity sorting and shape sorting for the residue on the sieve by the sieve having a mesh size of 3 to 5 mm have the same specific gravity sorting and shape sorting for the residue under the sieve and the air velocity of air, and the specific gravity sorting for the residue under the sieve. The frequency of reciprocating vibration is higher than that of shape sorting, and the angle of inclination with respect to at least one horizontal plane in the first axial direction and the second axial direction is larger than that of specific gravity sorting and shape sorting for the residue under the sieve. A processing method characterized by being done. The air table, and a second axial direction of the inner surface that is orthogonal to the first axis direction and the first axial direction within the surface of the air table is arranged so as to be inclined with respect to the horizontal plane, it The processing method according to claim 1 or 2. The residue is supplied to the vicinity of the end of the air table on the side where the height in the first axial direction is high, the air table is reciprocally vibrated in the second axial direction, and the air table is directed upward in the vertical direction from the surface. Airflow is generated
A third aspect of the present invention, wherein the residue is separated into a high side and a low side in the second axial direction in the vicinity of the end portion of the air table on the low side in the first axial direction. The processing method according to any one of 5. The processing method according to claim 6 , wherein the aluminum is separated on the lower side in the second axial direction. The air table is arranged so that the first axial direction in the surface of the air table and the second axial direction in the surface orthogonal to the first axial direction are inclined with respect to the horizontal plane.
In the specific gravity sorting and shape sorting for the residue on the sieve, the wind speed of the air is 2.7 to 2.9 m / s, the frequency of the reciprocating vibration is 500 to 540 rpm, and the inclination angle in the first axial direction is 9 to. 11 °, the inclination angle in the second axial direction is 8 to 10 °,
In the specific gravity sorting and shape sorting for the residue under the sieve, the wind speed of the air is 2.2 to 2.4 m / s, the frequency is 554 to 586 rpm, and the inclination angle in the first axial direction is 9 to 11 °. The processing method according to claim 1, wherein the inclination angle in the second axial direction is 6.5 to 8.5 °. Even if the shape selection and the gravity separation using the air table, the aluminum and the residue which could not be separated into other, claim 1, characterized in that repeated the shape selection and the gravity separation The processing method according to any one of 8 .

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