JP2021003661A - Treatment apparatus and treatment method for incineration bottom ash - Google Patents

Abstract

To effectively utilize an incineration bottom ash as a cement raw material and a raw material for refining while reducing treatment cost.SOLUTION: A treatment apparatus 1 for an incineration bottom ash includes: a magnetic separator 4 for separating incineration bottom ash into a magnetized material B and a non-magnetized material B; and a blowing separator 6 for separating the magnetized material B discharged from the magnetic separator 4 into a light product and a heavy product. The magnetic separator 4 may be a drum type magnetic separator having a magnet with a magnetic flux density of 1,500 gauss or more, and the blowing separator 6 can be a vertical type zigzag blowing separator. A drier 5 for drying the magnetized material B separated by the magnetic separator 4 is provided between the magnetic separator 4 and the blowing separator 6, and the blowing separator 6 can separate the magnetized material (dried material) dried by the drier 5 into a light product and a heavy product. A suspension type magnetic separator 2 having a magnet with a magnetic flux density of 1,000 gauss or more and 2,000 gauss or less is provided in front of the magnetic separator 4, and the magnetic separator 4 can separate the non-magnetized material A separated by the suspension type magnetic separator 2 into the magnetized material B and the non-magnetized material B.SELECTED DRAWING: Figure 1

Description

The present invention relates to an apparatus and a method for effectively utilizing incinerator ash generated in an urban waste incinerator or the like as a raw material for cement and a raw material for refining.

Waste such as municipal waste is incinerated, and the incinerated ash generated by incineration is conventionally landfilled at a landfill site. However, in recent years, in view of the risk of depletion of landfill sites, attempts have been made to effectively use incineration ash. In particular, attempts are being made to effectively use it as a cement raw material as a substitute for natural raw materials.

On the other hand, municipal waste incineration ash also contains repellent components such as chromium (Cr) and heavy metals such as copper (Cu) that are unnecessary for cement production. In particular, when the chromium concentration of the incineration main ash is high, the amount of the incineration main ash used as a cement raw material may have to be reduced, and the use of the incineration main ash as a cement raw material has been practically restricted. Therefore, in order to stably convert the incinerated main ash into a cement resource, it is preferable to reduce repellent components such as chromium and other unnecessary components by pretreatment.

As a technique for separating heavy metals from municipal waste main ash, for example, in Patent Document 1, incineration main ash is separated into magnetic and non-magnetic deposits by magnetic force sorting, and the separated non-magnetic deposit is used as a cement firing device. It is described that it is used as a cement raw material with a reduced chromium content.

Although the above invention is effective, this ash is attached to the magnetic material obtained by magnetically separating the main ash to be incinerated, especially the fine particles collected by the drum type or roll type magnetic separator. As a result, the quality of the magnetic material deteriorates, and there is a problem that it is difficult to use the magnetic material as a raw material for refining.

On the other hand, in Patent Document 2, in order to efficiently recover iron resources having a low impurity content and a high iron content and which can be recycled, iron scrap is magnetically sorted from the incineration residue and magnetically sorted. A technique for injecting high-pressure water onto the scrap iron to remove impurities adhering to the scrap iron is described.

Further, Patent Document 3 has a vertical cylindrical crushing chamber for crushing a material to be crushed by hitting a multi-stage chain that swirls at high speed, and hot air or air is supplied as a swirling flow to the lower part of the crushing chamber. Disclosed is a technique for dry-cleaning a magnetic material recovered by a magnetic separator using a chain striking crushing dryer.

JP-A-2017-137224 Japanese Unexamined Patent Publication No. 2008-1931 Japanese Unexamined Patent Publication No. 2008-178808

However, the invention described in Patent Document 2 requires a water treatment facility because wet cleaning is performed using high-pressure water, and the invention described in Patent Document 3 is a crushing dryer for crushing a magnetic material. There is a problem that the processing cost is high in each case because the wear is severe and regular maintenance is required.

The present invention has been made in view of the above-mentioned problems in the prior art, and an object of the present invention is to effectively utilize the incineration main ash as a raw material for cement and a raw material for refining while keeping the processing cost low.

In order to achieve the above object, the present invention is an incineration main ash processing apparatus, which is a magnetic force sorter that separates the incineration main ash into a magnetic material and a non-magnetic material, and a magnetic material discharged from the magnetic force sorter. It is characterized by being equipped with a wind sorter that separates light products and heavy products.

According to the present invention, since the magnetic cement is separated into light products and heavy products by the wind power sorter in the subsequent stage of the magnetic force sorter, incineration is performed while keeping the processing cost low without using a wet washing machine or a crushing dryer. The main ash can be effectively used as a raw material for cement and a raw material for refining.

In the incineration main ash processing apparatus, a drum type magnetic force sorter having a magnet having a magnetic flux density of 1500 gauss or more and 5000 gauss or less can be used as the magnetic force sorter. Further, as the wind power sorter, a vertical zigzag wind power sorter can be used.

In the incineration main ash processing apparatus, a dryer for drying the magnetic deposits separated by the magnetic force sorter is provided between the magnetic force sorter and the wind power sorter, and the wind power sorter is the dryer. By separating the dried magnetic material into light products and heavy products, the separation efficiency of the wind power sorter can be improved.

In the incineration main ash processing apparatus, a hanging magnetic sorter having a magnet having a magnetic flux density of 1000 gauss or more and 2000 gauss or less is provided in front of the magnetic sorter, and the magnetic sorter (suspended magnetic sorter). The magnetic sorter (not a magnetic sorter) is configured to separate the non-magnetic deposits separated by the hanging magnetic sorter into a magnetic deposit and a non-magnetic deposit, thereby removing relatively large magnetic deposits in advance. The presence of a relatively large magnetic substance avoids the risk that other non-magnetic objects will be caught in the relatively large magnetic object by the magnetic sorter in the subsequent stage and will not be easily collected on the magnetic object side. The separation efficiency of chromium can be increased.

In the incineration main ash processing apparatus, a sieving machine that separates the non-magnetic material separated by the hanging magnetic force sorter into a sieving product and a sieving material is provided after the hanging type magnetic force sorting machine. The magnetic force sorter (a magnetic force sorter that is not a hanging type magnetic force sorter) is provided by separating the undersieved material separated by the sieve sorter into a magnetic material and a non-magnetic material. A relatively large object can be collected in advance in the previous stage to further improve the quality of the magnetic object and the separation efficiency of chromium.

Further, the present invention is a method for treating the main ash to be incinerated, in which the main ash to be incinerated is magnetically sorted into a magnetic material and a non-magnetic material, and the magnetic material obtained by the magnetic force selection is made into light products and heavy products by wind power. It is characterized in that light products obtained by sorting are used as a raw material for cement, and heavy products obtained by the wind sorting are used as a raw material for refining. According to the present invention, the main ash incinerated can be effectively used as a raw material for cement and a raw material for refining without using a wet washing machine or a crushing dryer while keeping the processing cost low.

As described above, according to the present invention, the incineration main ash can be effectively used as a cement raw material and a refining raw material while keeping the processing cost low.

It is a block diagram which shows one Embodiment of the incineration main ash processing apparatus which concerns on this invention.

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of an incinerator main ash processing device according to the present invention, in which the processing device 1 includes a magnetic force sorter (hereinafter referred to as “magnetic separator”) 2 for magnetically sorting incinerated main ash. A sieving machine 3 for sieving the non-magnetic material A separated by the magnetic separator 2, a magnetic separator 4 for magnetically sorting the sieving material separated by the sieving machine 3, and a magnetic material separated by the magnetic separator 4. A dryer 5 for drying B and a wind sorter 6 for separating the dried product discharged from the dryer 5 into light products and heavy products are provided.

The magnetic separator 2 is provided to remove a relatively large magnetic deposit A contained in the incineration main ash in advance and effectively perform magnetic force selection in the subsequent stage, and is a magnet having a magnetic flux density of 1000 gauss or more and 2000 gauss or less. A hanging magnetic flux sorter or the like can be used.

Similar to the magnetic separator 2, the sieve sorter 3 is also provided to remove relatively large substances contained in the incinerator main ash in advance and effectively perform magnetic separation in the subsequent stage, and has a sieve mesh of 25 mm or more. Can be used.

The magnetic separator 4 is provided to recover the magnetic material B from the sieve material of the sieve sorter 3, and a drum type magnetic force sorter having a magnet having a magnetic flux density of 1500 gauss or more and 5000 gauss or less can be used.

The dryer 5 is provided to dry the magnetic material B separated by the magnetic separator 4 to improve the separation efficiency of the wind power sorter 6, and a rotary dryer or the like can be used.

The wind power sorter 6 is provided to separate the dried product from the dryer 5 into light products and heavy products, and a vertical zigzag wind power sorter with high sorting accuracy can be used.

Next, the operation of the processing device 1 having the above configuration will be described with reference to FIG.

The relatively large magnetic material A contained in the received incineration main ash is removed by the magnetic separator 2, the non-magnetic material A sorted by the magnetic separator 2 is sieved by the sieve sorter 3, and the relatively large material is used as a sieve. Remove. The sieved material can be recycled as scrap. The sieve material of the sieving machine 3 is supplied to the magnetic separator 4 to separate the magnetic material B and the non-magnetic material B, and the non-magnetic material B is used as a cement raw material.

Further, the magnetic substance B is supplied to the dryer 5, dried until the water content is about 15% or less, and the dried product by the dryer is supplied to the wind power sorter 6, separated into light products and heavy products, and the heavy products are separated. Is used as a raw material for refining.

As described above, according to the present embodiment, the magnetic deposit B can be efficiently separated into a cement raw material and a refining raw material and effectively used without using a wet washing machine or a crusher.

Next, examples of the present invention will be described.

204 kg of municipal waste incineration main ash (raw ash) was treated by the above treatment device 1. In this embodiment, the magnetic separator 2 uses a hanging magnetic sorter or the like equipped with a magnet having a magnet density of 1000 gauss. The sieve sorter 3 set the sieve mesh to 35 mm. As the magnetic separator 4, a drum-type magnetic force sorter or the like equipped with a magnet having a magnet density of 1500 gauss was used. As the wind power sorter 6, a zigzag type wind power sorter was used. Table 1 shows the weight ratio, water content, chromium concentration (chemical composition), chromium content and distribution rate of the incinerated main ash and the separated product in each step. The weight ratio is the weight ratio of each separated product when the weight of the raw ash is 100. Moisture was calculated from the amount of decrease when heated at 105 ° C. until the weight became constant. The chromium concentration was quantified by absorptiometry or ICP emission spectroscopy on a sample that was finely pulverized to 100 μm or less after mat melting treatment. The chromium distribution ratio was estimated from the weight ratio of each isolate and the results of the chromium concentration analysis.

From Table 1, the chromium distribution ratio of the non-magnetic deposit B used as a cement raw material is 57.7%, and about 1/2 of the chromium contained in the incineration main ash can be removed, and chromium is efficiently removed from the incineration main ash. It turns out that can be removed.

Further, the magnetic material B was wind-sorted by changing the wind speed of the wind power sorter 6. Table 2 shows the weight ratio of the magnetic substance and the ash (light product) in the heavy products obtained by the wind power sorting of the wind power sorter 6.

From Table 2, it can be seen that the ash adhering to about 10% in the magnetic material can be reduced to 5% or less by performing wind sorting under the condition of a wind speed of 2 m / s or more. It can also be seen that the higher the wind speed, the higher the ash removal rate.

As described above, according to the present embodiment, the non-magnetic deposit B having a low chromium content can be effectively used as a cement raw material, and the chromium content of clinker can be kept low. In addition, heavy products having a high content of magnetic deposits can be effectively used as raw materials for refining.

In the above embodiment, a magnetic separator 2 and a sieve sorter 3 are provided in order to remove relatively large magnetic deposits and the like contained in the incinerator main ash. However, depending on the properties of the received incinerator main ash and the like, these are provided. Can be omitted or only one of them can be used. Further, the types of the magnetic separator 2 and the sieve sorter 3, the magnetic flux density of the magnet, and the size of the mesh are not limited to the above.

Further, the type of the magnetic separator 4 and the magnetic flux density of the magnet are not limited to the above. Further, it is preferable to provide the dryer 5 because the separation efficiency of the wind power sorter 6 in the subsequent stage can be improved, but this can be omitted when the water content of the magnetic substance B is already about 15% or less. ..

1 Incinerator main ash processing device 2 Magnetic separator 3 Sieving separator 4 Magnetic separator 5 Dryer 6 Wind separator

Claims (7)

A magnetic sorter that separates the main ash from incineration into magnetic and non-magnetic materials,
An incinerator main ash processing apparatus comprising a wind power sorter for separating magnetic deposits discharged from the magnetic force sorter into light products and heavy products. The incinerator main ash processing apparatus according to claim 1, wherein the magnetic force sorter is a drum type magnetic force sorter having a magnet having a magnetic flux density of 1500 gauss or more and 5000 gauss or less. The incinerator main ash processing device according to claim 1 or 2, wherein the wind power sorter is a vertical zigzag wind power sorter. A dryer for drying the magnetic material separated by the magnetic force sorter is provided between the magnetic force sorter and the wind power sorter.
The incinerator main ash processing apparatus according to claim 1, 2 or 3, wherein the wind power sorter separates a magnetic substance dried by the dryer into a light product and a heavy product. A hanging magnetic force sorter having a magnet having a magnetic flux density of 1000 gauss or more and 2000 gauss or less is provided in front of the magnetic force sorter.
The magnetic force sorter (a magnetic force sorter that is not a hanging type magnetic force sorter) is characterized in that the non-magnetic material separated by the hanging type magnetic force sorter is separated into a magnetic material and a non-magnetic material. Item 4. The incineration main ash processing apparatus according to any one of Items 1 to 4. A sieving sorter for separating the non-magnetic material separated by the hanging magnetic sorter into a sieving object and a sieving object is provided after the suspension type magnetic force sorting machine.
The fifth aspect of the invention is characterized in that the magnetic force sorter (a magnetic force sorter that is not a hanging type magnetic force sorter) separates the undersieved material separated by the sieve sorter into a magnetic material and a non-magnetic material. The described incineration main ash processing apparatus. The main ash to be incinerated is magnetically sorted into magnetic and non-magnetic materials.
The magnetic deposits obtained by the magnetic force sorting are wind-sorted into light products and heavy products.
Using the light products obtained by the wind power sorting as a cement raw material,
A method for treating incineration main ash, which comprises using the heavy products obtained by the wind power sorting as a raw material for refining.

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