JPH0929204A - Method for treatment of waste incinerated ash and apparatus therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transform a general waste incineration ash into a form capable of being safely treated by a method wherein the incineration ash is pulverized to make a controlled granule of a specific grain size, and after kneading it with, a solidifying material and an additive they are pelletized to be classified into a plurality of pellets of prescribed particle sizes, and the pellets of a prescribed particle size and various kinds of aggregates are mixed by a specific ratio to make a recycling product. SOLUTION: An incineration ash and the other noncombustible inorganic waste from an incineration furnace are supplied to a primary crusher 2 from a hopper 1. After crushing them primarily, magnetic metals such as iron or the like are selected with a magnetic separator 3 to be removed. Then, after sieving the crushed product with a primary classifier 4, it is heated with a dryer 5 to evaporate excess water content. Then, the crushed product is pulverized with a secondary crusher 6 to make a controlled granule, which is classified by passing through a secondary classifier 7. Thereafter, a solidifying material 9, an additive 10, and water are added to the product to be kneaded. The kneaded product is pelletized with a pelletizer 11. The pellet is classified with a classifer 13. The pellet of a prescribed particle size and various kinds of aggregate are mixed in a mixer 15, and a recycle product capable of being used as a road bed material or the like can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating waste incineration ash.

[0002]

2. Description of the Related Art Among wastes including industrial wastes and wastes from urban life, wastes mainly combustibles are collected and then incinerated in an incinerator to be dumped and buried in the form of incinerated ash. It is attached to disposal. However, with regard to the disposal of the incineration ash, the land for accepting the dumping has decreased sharply in recent years like other wastes, and the transport cost has increased due to the remote disposal of the dumping land, and recently a new candidate site has been set. That itself is extremely difficult.

Further, incineration ash is derived from wastes from various emission sources, and in addition to the original incineration ash, various substances such as non-combustible inorganic substances such as iron and non-ferrous metals, glass, and ceramics are formed into various shapes, Since it is difficult to process because it is contained in the form, Cd, Hg, Zn, Mn, Cr and other harmful heavy metals may be mixed in, and the final disposal thereof is strict in terms of environmental hygiene. It requires management and cannot be simply discarded or used as landfill material.

Inorganic wastes such as metal, glass, ceramics, etc. are often sorted and collected as incombustibles in advance and disposed of without incineration. However, such incombustibles are also subject to final disposal. It causes the same problems as incineration ash. In the present invention, a waste containing such a non-combustible inorganic waste in a part of the incinerated ash is also a target.

Under these circumstances, various methods for treating waste incineration ash have been proposed. For example, Japanese Patent Application No. 4-2188
As shown in No. 22, the waste incineration ash from the incinerator is crushed into primary and secondary particles and sized so as to have a predetermined particle size distribution, and this is kneaded as an aggregate with a cement binder and pressure-molded. , A treatment method for curing to make concrete block-like recycled products has been proposed.

[0006] According to this treatment method, it is possible to obtain a recycled product in a form in which the incineration ash of general waste is treated and can be safely disposed of as it is without fear of causing environmental pollution.

[0007]

Since the recycled product obtained by the above-mentioned treatment method has a concrete block shape, it is used only for a special purpose such as a river reinforcing material, a road slope reinforcing material and a backfill material.

Civil works using the above-mentioned river reinforcing material, road slope reinforcing material, and backfill material are limited, and their use amount is also limited, and demand is low.

For this reason, if the waste incineration ash is continuously treated by the above-mentioned treatment method, a large amount of recycled products, which is larger than the demand, can be obtained and a large amount of the recycled products can be stocked. A product stock location is required, which is a cost disadvantage.

For the above reasons, the above-mentioned processing method is not actually practiced at present.

Therefore, the present invention provides a method and an apparatus for treating waste incineration ash, which enables to obtain recycled products that can be used as roadbed materials, roadbed materials, etc., which are used in large quantities in road construction and the like. With the goal.

[0012]

[Means for Solving the Problems] Incinerator ash discharged from an incinerator is crushed in order to obtain a sized product having a predetermined particle size, and the sized product, a solidifying material and an additive material are kneaded to produce a kneaded product. A method for treating waste incineration ash, which comprises granulating, classifying the granules into granules having a plurality of particle sizes, and mixing the granules having each particle size with various aggregates at a predetermined ratio to produce recycled products. A crusher for crushing the incinerated ash discharged from the incinerator, a classifier for classifying the crushed product into a sized product, a kneader for kneading the sized product, the solidifying material and the additive material, and the kneaded product A granulator for granulating the granules, a classifier for branching the granules, a storage device for storing the granules for each particle size, and a mixer for mixing the stored granules with various aggregates Waste ash treatment equipment.

[0013]

[Operation] The processed recycled product is a mixture of multiple granules with different particle sizes and aggregate, and the recycled product can be used as roadbed material and roadbed material. However, even if the incineration ash is continuously processed, recycled products will not be stocked and it will be practical.

[0014]

EXAMPLE An example of the processing method of the present invention will be described based on the system block diagram shown in FIG. Providing incineration ash and other non-combustible inorganic waste from an incinerator (not shown) is supplied from a hopper 1 to a hammer mill-type primary crusher 2 and has a particle size of about 20 mm or less so that the next process can be easily processed. Primary crushed into particles. Then, iron, steel and other magnetic metals were selected and removed from the primary crushed product by a permanent magnet suspension type magnetic separator 3. The aluminum can and the like were removed by visual selection beforehand. Next, the coarsely crushed product was sieved by a primary classifier 4 including a vibrating screen, and the coarsely crushed product having a particle diameter of 20 mm or more was returned to the coarse crusher 2 by a return conveyor.

The incinerated ash used in this example is sprinkled in the state of being discharged from the furnace for cooling and prevention of scattering, and since it contains about 30% of water as a whole, it is about 700 ° C. Was heated for 10 minutes by a rotary dryer (rotary kiln) 5 using hot air from the hot air generating furnace to evaporate the excess water content to a water content of about 15% by weight. A deodorizer 5A and a dust collector 5B were attached to the heating dryer 5 in order to prevent dust and odor during heating. In addition, there is also an effect of burning organic matter in the ash to make it inorganic during the heating.

Next, the dried coarsely crushed product was crushed by a secondary crusher 6 of a hammer mill system to obtain a sized product having a particle size distribution of about 5.0 mm or less. Next, the sized product is passed through a secondary classifier 7 using a vibrating screen, where the particle size is 5.
The coarsely crushed product having a size of 0 mm or more was returned to the secondary crusher 6 again from the return conveyor.

Each of the above steps is a pretreatment step for incineration ash, whereby the incineration ash becomes a sized product having a predetermined particle size distribution.

Next, the sized product is mixed with a biaxial type forced kneading mixer (K
BHS-60E: manufactured by Koyo Kikai Sangyo Co., Ltd.), and the mixture was kneaded by adding the solidifying material quantitatively supplied from the solidifying material silo 9 and the additive material quantitatively supplied from the additive material silo 10 and water.

The mixing ratio of the solidifying material is 10% with respect to the sized product,
The mixing ratio of the additive material was set to 10% with respect to the solidified material, and the ratio of water was set to 15% with respect to the whole (sized particles + solidified material + additive material). Note that this ratio is one example, and the solidifying material is approximately 5 to 5.
40%, and the additive may be about 5 to 20% with respect to the solidified material.

The solidifying material firmly bonds the sized products formed from incinerated ash to each other, and a cement binder having a composition of blast furnace cement, Portland cement or alumina cement is used. In the above-mentioned examples, the solidifying material is mainly Portland cement, to which organic acid salts such as sodium lignin sulfonate, sodium stearate and sodium tripolyphosphate, and inorganic auxiliary agents such as calcium aluminate, calcium aluminosulfate and calcium silicate. The total amount of the agent added was 1 to 3 parts by weight. In the above-mentioned implementation, as the additive material, an additive material having an effect of causing ettringite crystals to break out was used for the purpose of early strength development and the like. Also, depending on the case, an additive material having a higher elution preventing effect such as heavy metals may be used,
Furthermore, it is of course possible to add both of them in duplicate.

Next, a large number of holes having a diameter of 8 mm and a thickness of 2
By supplying the above kneaded product to an extrusion type granulated product 11 equipped with a 0 mm die and granulating the granulated product, the diameter is approximately 8 mm and the length is 12 m.
m was obtained.

The resulting granulated product was aged at room temperature by a curing device 12 such as a belt conveyor, and the crush strength of the granulated product after 2 hours was measured and found to be 1.4 kg. It is 0.3 kg and is 1 when aged for 28 days.
It was 1 kg.

In consideration of the fact that the above-mentioned granulating step is performed in parallel with the rolling granulator 11 which has a low running cost, is easy to operate, and the granulated product is spherical and the size can be arbitrarily adjusted. Grained. The granulation conditions at this time are as follows: pre-treated particles with a particle size of 5.0 mm or less (incinerated ash) containing 10% solidifying material
(To incineration ash), 10% additive material (to solidification material) and 17
~ 20% (against incineration ash + solidifying material + additive material) and supply to a rolling granulation, granulation time is 8 to 20 minutes
A granulated product of 9.3 mm was obtained. The crushing strength of the obtained granules was 1 at a room temperature after curing with a curing device, and was 1 after the measurement.
It is 1.9 kg (diameter 9 mm).

Next, the obtained granules were classified by an electric classifier 13. The classification results are shown in Table 1 below.

[0025]

[Table 1]

Next, the granulated material classified into each was stored in a storage device 14 such as a tank for each particle size.

The extruded granules are cut out at the lower part of each storage device 14 by a cutting device 14a having a gate capable of adjusting the cutting amount, and the granules at each particle size are cut out, and the mixer 15 is used by a belt conveyor. Supplied to.

Similarly to the granulated material, the cement concrete crushed aggregate crushed aggregate is stored in each storage device 16 for each grain size, and the crushed cement concrete crushed aggregate of each grain size is cut out by the cutting device 16a and mixed by the belt conveyor 15 Supplied to.

Next, the granulated material of each particle size supplied to the mixer 15 and the cement concrete crushed aggregate aggregate were mixed to produce a recycled product (granulated aggregate).

At this time, the cutting and mixing ratio of the granulated material of each particle size and the cement concrete crushed aggregate is such that the weight of the granulated material of the extruding granulator is 2.5 to 5.0 mm.
%, Particle size 5.0-13.0 mm weight 58%, particle size 1
3.0mm or more weight 1% and cement concrete crushed aggregate particle size 0-2.5mm weight 9%, particle size 2.5
~ 5.0mm weight 5%, grain size 5-13mm weight 22
%, And a particle size of 13.0 mm or more with a weight of 4%.

Since the recycled product (granulated aggregate) obtained in this example is also used as a roadbed material or a roadbed material,
A confirmation test was conducted on the physical property values specified in the asphalt pavement summary standards. The results are shown in Table 2 below, and it was found that they can be sufficiently used as the upper layer roadbed material, the lower layer roadbed material, and the roadbed material. In the above example, concrete glass was used as the aggregate, but other glass pieces,
Generally used materials such as crushed stone or crushed pieces of the above-mentioned granulated aggregate, stone powder, and ascon may be used.

[0032]

[Table 2]

Further, by adjusting the shape and usage ratio of the granulated product and the kind and addition ratio of the aggregate to be added depending on the intended use of the recycled product, the recycled product of optimum quality and low cost (granulated bone Material) can be manufactured.

As described above, according to the treatment method of the present invention, recycled products (granulated aggregates) can be used as roadbed materials and roadbed materials, and have the following advantages. Road repair work or new construction work is carried out regularly, and since the amount of each work is large and there is a large demand on a regular basis, recycled products will not be stocked even if they are continuously processed.

Further, since the incinerated ash is granulated, dust does not fly up during loading / unloading on a carrier vehicle and road construction, and the working environment does not deteriorate, so that a worker refuses to use. Recycle is promoted.

[0036]

EFFECTS OF THE INVENTION The treated recycled product is a mixture of a plurality of granules having different particle sizes and aggregates, and the recycled product can be used as roadbed material or roadbed material. Therefore, the demand for the recycled product is high. In many cases, recycled products will not be stocked even if incinerated ash is continuously processed, and it will be practical.

[Brief description of drawings]

FIG. 1 is a system block diagram showing one embodiment of the present invention.

[Explanation of symbols]

 1 ... Hopper 2 ... Primary crusher 3 ... Magnetic separator 4 ... Primary classifier 5 ... Dryer 5A ... Deodorizer 5B ... Dust collector 6 ... Secondary crusher 7 ... Secondary classifier 8 ... Kneader 9 ... Solidifying material silo 10 Additive silo 11 Granulator 13 Classifier 14 Storage device 15 Mixer 16 Storage device.

Claims (3)

[Claims] 1. An incineration ash discharged from an incinerator is sequentially crushed to obtain a sized product having a predetermined particle size, the sized product, a solidifying material and an additive material are kneaded, and the kneaded material is granulated, A method for treating waste incineration ash, characterized by classifying granules into granules of a plurality of particle sizes and mixing the granules of each particle size and various aggregates at a predetermined ratio to produce recycled products. . 2. A crusher for crushing incinerated ash discharged from an incinerator, a classifying material for classifying the crushed material into a sized product, and a kneading machine for kneading the sized product, a solidifying material and an additive material. A granulator for granulating the kneaded product, a classifier for branching the granulated product, and a storage device for storing the granulated product for each particle size,
An apparatus for treating waste incineration ash, which comprises a mixer for mixing the stored granules and various aggregates. 3. A recycled product in which a sized product obtained by crushing incinerated ash discharged from an incinerator, a granulated product obtained by kneading a solidifying material and an additive material and having different particle sizes, and various aggregates are mixed at a predetermined ratio.