JPH11333423A - Method and apparatus for disposal of industrial waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a hazardous substance to be hardly eluted from an industrial waste by a method wherein a cement and a water glass solution are added to a raw material of the industrial waste, stirred to prepare a muddy mixture, many granular bodies are formed by rounding the mixture, and the granular body is dried and hardened. SOLUTION: A raw material 1 of an industrial waste is transported upward with a case conveyor 2, the raw material 1 is cast into a hopper 3, and fed to a vibration screen 5 with a cutting out conveyor 4. After adjusting a particle size, it is cast into a mixer 7 with a flow conveyor 6, and a cement from an adding mouth C and a water glass solution from a sprayer 19 are added thereto. They are stirred to prepare a muddy mixture 8, the mixture 8 is rounded with a pan type granulating machine 10 to form many granular bodies 9, and the granular body 9 is dried in a drying room 12 to be hardened. Thereby, the granular body 9 can be made to a stabilized state wherein the hazardous substance is difficult to be eluted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to incineration ash generated when burning garbage brought into an incineration plant, soot and dust trapped by a filter provided in a chimney of an incinerator,
Alternatively, the present invention relates to a treatment method and a treatment apparatus for stably stabilizing harmful industrial waste such as sludge accumulated in a sewage treatment plant.

[0002]

2. Description of the Related Art Industrial wastes of the type described above contain harmful substances such as mercury, cadmium, lead, and PCBs. It is statutory that landfills will be made after stabilization. In addition, incinerated ash and soot have a large capacity in spite of their weight, and it is desired to reduce the volume when disposing of them.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to produce industrial waste in a stable state in which harmful substances hardly elute, and to incinerate it. An object of the present invention is to provide a method and an apparatus for treating industrial waste that are suitable for reducing ash and dust.

[0004]

According to a first aspect of the present invention, there is provided a method for treating industrial waste, comprising adding cement and a water glass solution to a raw material of an industrial waste consisting of a powder or a mud. The method is characterized in that a muddy mixture is formed by stirring, the mixture is rolled to form a large number of granules, and the granules are dried and hardened. Here, the powdery material refers to incineration ash and soot and dust, and the muddy material refers to sludge accumulated in a sewage treatment plant. The water glass solution is obtained by diluting water glass to have a viscosity suitable for spraying.

[0005] In order to easily curl the mixture, it is necessary to maintain the water retention at an appropriate level, and when the mixture itself has a high water retention, the mixture is dried to an appropriate level. When cement and water glass solution are mixed with the raw materials, the cement condenses from the water glass solution and removes the water required for the hydration reaction as a condition for hardening, and conversely, the water glass solution is dehydrated. Quickly obtains the ability as a binder to solidify the raw material.

In the first aspect of the present invention, cement and water glass solution are added to the raw materials. However, as in the second aspect of the present invention, instead of the cement and water glass solution, a silicon oil solution and a vinyl acetate system are used. A resin solution may be used.

In this case, the raw material is hardened by the vinyl acetate resin solution, and water repellency is obtained by the silicone oil, so that the hardened granular material hardly contains moisture.

According to the first aspect of the present invention, a method is used in which a mud-like mixture composed of a raw material, cement, and a water glass solution is rolled to form a large number of granules, and the granules are dried and hardened. However, as in the invention according to claim 3, the cement and the water glass solution are added to the raw material of the industrial waste consisting of the powder or the mud, and the mixture is mixed with the mud-like mixture by stirring. None, the mixture is rolled to form numerous granules,
After spraying a water glass solution onto the granules to coat the surfaces of the granules, the granules may be dried and cured.

According to the second aspect of the present invention, a mud-like mixture composed of a raw material, a silicon oil solution and a vinyl acetate resin solution is rolled to form a large number of granules, and the granules are dried and cured. However, a silicon oil solution and a vinyl acetate resin solution are added to the raw material of the industrial waste consisting of a powdery substance or a muddy substance and stirred, as in the invention according to claim 4. By forming a muddy mixture by this, the mixture is rolled to form a number of granules, and the granules are sprayed with a silicon oil solution to coat the surfaces of the granules, and then dried and cured. good.

In the case of the invention described in claim 3 and the invention described in claim 4, the form is such that the raw material of industrial waste is not exposed at all on the surface of the granular material.

[0011] The apparatus for treating industrial waste according to claim 5 comprises:
The raw material of the industrial waste consisting of powder or mud is adjusted through a separator to adjust the particle size, and the raw material and cement and water glass solution, or the raw material, silicon oil solution and vinyl acetate resin solution are mixed in a mixer. To form a muddy mixture, and to put the mixture into a pan-type granulator to form a large number of granules, pass the granules through a drying chamber, and cure the granules. Features.

[0012] The apparatus for treating industrial waste according to claim 6 comprises:
The bread-type granulator is characterized in that a spraying device for spraying a water glass solution or a silicon oil solution on the granules is provided. In addition, when the raw material, cement and water glass solution are used for the material of the granular material, the water glass solution is sprayed on the granular material, and when the raw material, the silicon oil solution and the vinyl acetate resin solution are used for the material, Sprays a silicon oil solution on the granules.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an industrial waste treatment apparatus according to the present invention transports a raw material 1 of industrial waste upward by a case conveyor 2 and feeds the raw material 1 to a lower rear portion of the case conveyor 2. 1 is provided with a front end of a cutting conveyor 4 provided with a hopper 3 into which the raw material 1 is charged, and a vibrating screen 5 serving as a sorter for adjusting the particle size of the raw material 1 is arranged below a rear portion of the cutting conveyor 4. The front end of the flow conveyor 6 for transferring the raw material 1 is provided below the mixer 5, the front end of the mixer 7 is disposed below the rear end of the flow conveyor 6, and the mixer 7 falls from the mixer 7 below the rear end of the mixer 7. A bread granulator 10 for converting the mud-like mixture 8 into a large number of granules 9 is provided, and the large number of granules 9 overflowing from the bread granulator 10 are moved below the bread granulator 10. Drying room with conveyor 11 The second front end portion is disposed, further,
At the lower rear of the drying chamber 12, a front end of a product conveyor 13 for transferring the dried granules 9 is provided.

The vibrating screen 5 adjusts the particle size by vibrating a mesh, and allows a raw material having a diameter of about 10 mm to pass therethrough.

The flow conveyor 6 is provided with an addition port C for cement at the rear end, so that the cement is charged into the mixer 7 together with the raw material 1, but the location of the addition port C is different. May be.

As the mixer 7, a paddle mixer is used. As shown in FIG. 2, the blades 15, 15 are spirally arranged on a pair of shafts 14, 14 rotating in opposite directions.

The case 16 has a wind tunnel shape, and is provided with an inlet 17 for the raw material 1 falling from the flow conveyor 5 on the front side, and a discharge port 18 hanging downward at the rear end. Further, a spraying device 19 for adding a water glass solution is provided at an intermediate portion of the case 16, and the raw material 1, the cement and the water glass solution are moved inside the case 16 while being stirred, and the discharge port 18 is
Head for.

Further, in the case 16, a hot air intake 20 by a kerosene burner is provided on the front side, and a hot air discharge port 21 is provided on the rear side. Then, a stirrer with a fan is built in the inlet 20 so that the hot air can uniformly hit the mixture 8.

As shown in FIG. 4, the bread-type granulator 10 has a horizontal member 25 for supporting a bottom scraper 23 and a side scraper 24 on an upper part of an inclined pan 22. A water glass solution spray device 26 is provided. More specifically, the position of the spraying device 26 is provided on the side where the granules 9 are raised by the rotating action of the pan 22, thereby facilitating uniform coating of the water glass solution.

The drying chamber 12 plays a role of blowing water out of the granules and hardening the granules themselves. The drying chamber 12 has a wind tunnel shape and a mesh belt conveyer 11 therein. In addition to providing an intake 27,
A discharge port 28 is provided on the rear side. In the bread-type granulator 10, since the granular material 9 overflows from the lower end of the inclined bread 22, the front end of the conveyor 11 faces the lower side. In addition, the rear end of the conveyor 11 faces the product conveyor 13, and continuous operation is performed as a whole.

As shown in FIG. 3, the granular material 9 as a finished product is formed into a rounded granular shape and has a size of 5-1.
The ball is about 5 mm, and the surface is covered with the coating layer 29. Since the coating layer 29 is hardened while passing through the drying chamber 12, the surface is hard and does not stick, so that it is easy to handle. In addition, soot and incinerated ash were used as raw materials. By the way, as for the ratio of the materials, cement 1 to 1.5,
Experimental results showed that 0.5 to 1.5 water glass solution (25% water, 25% caustic soda, 50% sodium silicate) was suitable.

The industrial waste treatment apparatus of the present invention is not limited to the above embodiment. For example, as described above, the raw material 1 of industrial waste is incinerated ash, dust, sludge, and the like. Since these are basically different in properties and water concentrations, the ratio of cement or water glass solution,
The presence or absence of heating and drying in the mixer 7 is appropriately set according to the properties and the like. The component ratio of the water glass solution is
It is set in consideration of the ratio of cement in addition to its properties. And since the water required for cement is supplied by this water glass solution, addition of water is not necessarily required as a setting condition of cement.

In the above-described embodiment, the cement is supplied to the raw material from the addition port C, and the water glass solution is added by the spraying devices 19 and 26. However, the present invention is not limited to this. Inject vinyl acetate resin solution from C,
A method of adding a silicon oil solution with the spray devices 19 and 26 may be used. In this case, for the proportion of material,
Silicon oil solution (silicone oil 1: water 3) 0.7-1.0, vinyl acetate resin solution (ethylene vinyl acetate synthetic polymer emulsion 1: water 2) 0.2 to ash 10 in weight ratio It was obtained from the experimental result that 0.3 was preferable. As the ethylene-vinyl acetate synthetic polymer emulsion, for example, a product name sold by Nippon Kasei Co., Ltd., NS Hyflex HF-
1000 is used.

[0024]

As described above, according to the first aspect of the present invention, not only the raw material of industrial waste but also water glass and cement are exposed on the surface of the granular material. As a result, the granular material is in a stable state in which harmful substances are hardly eluted. Also, when powdered incineration ash or dust is used as a raw material for industrial waste, the bulky powder is stirred with the cement and water glass solution added. As described above, the high-density state is obtained, and the granules formed from the mixture also have the high-density state, so that the bulky powder can be formed into a form suitable for weight reduction.

According to the second aspect of the present invention, not only raw materials of industrial waste but also silicon oil and a vinyl acetate resin solution are exposed on the surface of the granular material,
The water repellency of the silicone oil makes it difficult for water to enter the granular material, so that the granular material is in a stable state in which harmful substances are hardly eluted.

According to the third aspect of the present invention, since the surface of the granular material is sprayed with the water glass solution, the surface of the granular material is completely covered with the water glass. Not stable can be.

According to the fourth aspect of the present invention, since the surface of the granular material is completely covered with the silicone oil, it is possible to stably prevent harmful substances from being eluted at all.

According to a fifth aspect of the present invention, the same effects as those of the first aspect are obtained by using a raw material, cement, and a water glass solution as the material of the granular material, and the raw material and the silicon oil solution are used as the material of the granular material. If the vinyl acetate resin solution is used, the same effect as that of the second aspect can be obtained.

According to a sixth aspect of the present invention, the same effect as the third aspect of the invention can be obtained by spraying a water glass solution when granules are formed from a raw material, cement and a water glass solution. If the silicon oil solution is sprayed when the granular material is formed from the silicone oil solution and the vinyl acetate-based resin solution, the same effect as the invention of claim 4 can be obtained.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an entire industrial waste treatment apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view of a mixer in the industrial waste treatment apparatus.

FIG. 3 is a sectional view of a granular material.

FIG. 4 is an enlarged view showing a place where a spraying device is attached to a bread granulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw material 5 Sorting machine (vibrating screen) 7 Mixer 8 Mixture 9 Granular material 10 Bread granulator 12 Drying room 26 Sprayer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B09B 3/00 301M 301R

Claims (6)

[Claims] Cement and a water glass solution are added to a raw material (1) of an industrial waste consisting of a powder or a mud, and the mixture is stirred to form a mud-like mixture (8). The body (8) is rolled to form a number of granular bodies (9, 9, ...),
A method for treating industrial waste, comprising drying and hardening the granules (9, 9, ...). 2. The method for treating industrial waste according to claim 1, wherein a silicon oil solution and a vinyl acetate resin solution are used in place of the cement and water glass solution. Cement and a water glass solution are added to a raw material (1) of an industrial waste composed of a powder or a mud, and the mixture is stirred to form a mud-like mixture (8). The body (8) is rolled to form a number of granular bodies (9, 9, ...),
A method for treating industrial waste, comprising spraying a water glass solution onto the granules (9, 9,...) To coat the surfaces of the granules (9, 9,...), Followed by drying and curing. . 4. A muddy mixture (8) by adding a silicon oil solution and a vinyl acetate resin solution to a raw material (1) of industrial waste consisting of a powdery or muddy body and stirring the mixture. The mixture (8) is rolled to form a large number of granules (9, 9,...), And a silicon oil solution is sprayed on the granules (9, 9,...) To form the granules (9, 9). , ...), and then drying and hardening after coating the surface of the industrial waste. 5. A raw material (1) of an industrial waste consisting of a powdery substance or a muddy substance is adjusted in particle size through a separator (5), and the raw material (1), a cement and a water glass solution, or a raw material (1), a silicone oil solution and a vinyl acetate resin solution are charged into a mixer (7) to form a mud-like mixture (8), and the mixture (8) is mixed with a bread granulator (10). ) To form a number of granules (9, 9,...), Pass the granules (9, 9,...) Through a drying chamber (12), and cure the granules (9). Characteristic industrial waste treatment equipment. 6. The pan-type granulator (10) is provided with a spray device (26) for spraying a water glass solution or a silicon oil solution on the granules (9). The industrial waste treatment device according to the above.