JPS5827221B2 - garbage collection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for effectively utilizing waste incineration ash.

According to the conventional method of processing incinerated ash from a garbage incinerator, the incinerated ash is dropped into a water tank attached to the garbage incinerator, then discharged by a conveyor, and then disposed of in a landfill.

This method not only requires wastewater treatment because it contaminates the water and is harmful, but the incineration ash itself also contains harmful substances, making it difficult to transport and handle them.

In addition, incineration ash is unburned, especially paper, plastics, leather,
It contains a wide variety of materials such as fibers, iron scraps, nonferrous metals, earth and sand, ceramics, glass scraps, and dust, and it is difficult to dispose of it in a landfill in a pollution-free state without adding other measures. Met.

In the present invention, incineration ash is removed from a garbage incinerator using a dry method without using water, and after primary crushing, iron scrap is separated by magnetic separation, and unburned by sieving. After separating the components and removing unnecessary components, and separating the intermediate particle size material and the product particle size material, the intermediate particle size material is converted into a useful material with a fine particle size by secondary crushing, and this Product particle size Materials are mixed with sand, cement, polyvinyl alcohol, and water, mixed uniformly, and then fed into a mold with a predetermined shape and size and compressed by a press. It is.

Conventionally, processing methods have been known in which waste incineration ash is finely divided, mixed with a stabilizer such as cement, and compression molded, etc., but the present invention aims to improve these processing methods and eliminate harmful substances in the material. The aim is to prevent the elution of the metal and to obtain a product that has high strength and quality.

Converting incineration ash into a material with a fine particle size makes the material easier to transport, store, feed, etc., and allows for uniform mixing with sand, cement, polyvinyl alcohol, and water, making these mixtures easier to handle. This is to make the filling state denser.

Furthermore, if it is mixed with smoke ash collected from the dust collector of the incinerator, the filling condition of the mixture, mixing, and crosstalk will be further improved, and since the incineration ash is evenly dispersed with the above materials, it can be compressed and molded. In addition, the solidified molded product not only prevents the elution of harmful substances from the material, but also makes it possible to manufacture a high-strength molded product.

The properties required for the cement mixture according to the present invention, which aims to prevent the elution of harmful substances from the material with fine particle size converted from incineration ash, are as follows: 1) Compression molding is dry type;
Can be constructed as semi-dry molding.

2) The mixture must be densely packed and cause water retention and coagulation with a small amount of water.

3) The mixture can be increased in bonding to adherends by the addition of polymeric binders.

4) The mixture is compression molded to obtain sufficient bonding strength,
Show high breaking strength.

5) The material is uniformly dispersed in the mixture to prevent harmful substances from leaching out after compression molding and solidification.

Examples include.

According to the knowledge obtained by the present inventors, the use of ordinary cement O
From this, the desired cement mixture could be obtained.

Embodiments of the present invention will be described below with reference to the drawings.

Incineration ash from the garbage incinerator 1 is taken out by a dry discharge device 2, crushed by a primary crusher 3, iron scraps 6 are removed by a magnetic separator 4, and the iron scraps 6 are removed from the iron scrap tank 7 and used as raw materials for steelmaking. Ru.

In machine 8, the sieve fraction is 14 unburned fractions and 10 medium particle size materials.
and product particle size materials 9, and the unburned matter 14 is returned to the waste incinerator 1 and incinerated together with the waste 15.

The intermediate particle size material 10 is further crushed by a secondary crusher 11, and the crushed products 12 and the product particle size material 9 are mixed and introduced into an intermediate storage tank 13.

The particle size obtained in this way is approximately 2 mm JJ, and the lower material 19 is supplied to the mixer 14, where it is mixed with sand 15 and cement 16.
, water 17, and polyvinyl alcohol 18 are blended and stirred and mixed for a certain period of time to obtain a homogeneous mixture.

Further, the mixture 20 is supplied to a mold of a molding press 21 to obtain a molded product 22 having a predetermined shape, and subsequently undergoes a curing step 23 to obtain a product 24.

Obtain products from incineration ash.

The operations up to this point were as follows.

Primary crushing: Crusher loaf circumferential speed Whole screen opening Crushed product particle size -25 to 51n 45m/5 75X100u+ 85% 59% Magnetic selection: Magnetic iron scrap apparent density Sieving: Supply amount unburned matter (+10mm) Intermediate particle size material (10mrtr-2mm) Product particle size Material (-2mm) Secondary crushing: Crusher loaf circumferential speed Whole screen opening Crushed product particle size -2mm -0,59mm Material properties: Ignition loss ash particle size -2mrrt -0,59mm Apparent Density Forming Machine Near 50 GaUSS 1, Og/cc 80kg 30.1 to 9 48.6kg 110.3kg 60 m/S X15mm 95% 52% 7.7% 92.3% 98.8% 50.8% 0 , 85 ji /cc The effect of the particle size of incinerated ash is seen in /161,2, and
A high-strength molded product can be obtained by setting the thickness to less than 100 mm.

The influence of the sand mixture is seen in /V; 3.4, indicating that the sand mixture is effective.

In yet another example, a molded product having a strength of 83.2 kg/- was obtained by blending smoke ash collected from an incinerator's dust collector.

The influence of the blending ratio of cement was seen at /16.5 and /16.6, and when the blending ratio was low, a molded product with high strength was not obtained.

Further, it is shown in /%7.8°9 that a molded product with even higher strength can be obtained by adding an adhesive made of polyvinyl alcohol or polyvinyl acetate.

The fine material is Pb2900p west, Cr6 to Cd12p
Although it contains heavy metals such as 50 ppm, in the case of /I66, according to the results of a hazardous substance elution test using a sample obtained by crushing a molded product, no collapse was detected in the above case.

According to the present invention, by converting the material into a finer material than in the known method, not only can a product with high strength and quality be obtained by the above-mentioned formulation, but also the elution of harmful substances in the material can be prevented. Furthermore, by removing the incinerated ash using a dry treatment method that does not require water, it has the effect of avoiding water pollution.

Further, according to the present invention, since the materials to be mixed to obtain the cement mixture are commonly used materials, it is possible to economically obtain a molded product.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing an embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. Incinerated ash from a garbage incinerator is dry-removed, crushed, magnetically separated, and sieved to produce intermediate particle size material, which is further crushed secondary to a material with a particle size of approximately 21 nrft or less,
This is mixed with the product particle size material obtained by the sieving, and this is mixed with 11.5 to 17.5% sand and 1% cement by weight.
5.5 to 22.5% and water 5.0 to 12.5% with the remainder being incinerated ash, blended and kneaded, and then supplied to a mold for compression molding. . 2. The incinerated ash from the garbage incinerator is dry-removed, crushed, magnetically separated, and sieved to produce intermediate particle size material, which is further crushed secondary to a material with a particle size of approximately 2 mm or less, and this and the sieved material obtained by the above-mentioned sieving. The product particle size is mixed with the material, and the weight ratio of sand is 11.5 to 17.5%, and cement is 15.5 to 15%.
22.5%, polyvinyl alcohol or polyvinyl acetate 0.8-2.0% and water 5.0-12%
．． A method for molding waste incineration ash, which is characterized by mixing and kneading 5% with the remainder being incineration ash, feeding it into a mold, and compressing it.