JP2011240319A - Method for disposing waste residues and waste residues granulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a recycling treatment including land-fill to be performed by making waste residues a granular material while insolubilizing heavy metals etc. through continuous operation, and facilitating conveyance and handling of the granular material.SOLUTION: Disposal of the waste residue involves a mixture prepared by stirring and mixing cement, water and a chelating agent by a high speed mixer is supplied to the inside of a cylindrical rotary drum, and granulated while being guided by a spiral conveyance interstructure, and discharged as a granular hardened material from the other end of the rotary drum.

Description

  The present invention relates to a method for treating waste residues mainly composed of earth and sand obtained by sorting waste with an existing sorting means (screen or the like) and a granule machine for waste residues.

  Normally, construction waste and mixed waste are sorted into combustibles such as plastic, wood, paper, cloth, or valuables (iron, non-ferrous metal) using means such as vibrating screens, and left after sorting. Residues, so-called earth and sand, are disposed of at the final disposal site. If the amount of heat loss of the earth and sand is 5% or less, the landfill is treated as a stable landfill. Must be disposed of at.

Among these residues, in order to treat them at a management-type treatment plant, in addition to the above-mentioned problem of heat loss, the residues include arsenic, selenium, heavy metals, etc. in light of the soil environmental standards and the soil contamination prevention law. This can only be done after the insolubilization treatment.
As such a treatment method, a conventionally performed method is generally a method of solidifying residues using a cement or a chelating agent (an insolubilization treatment material such as arsenic, selenium, and heavy metal).

The following can be mentioned as a prior art which processes the industrial waste mentioned above.
JP-A-11-333423. JP-A-2004-358456.

However, as a method for solidifying waste residues, it is not easy to mix the cement (10% to 20% in weight ratio) with the residues, and it is also possible to insolubilize heavy metals or the like with cement alone. It is difficult to use a small amount of a chelating agent because it is difficult, but even when this chelating agent is used, it is very expensive, so it is not easy to evenly mix this small amount of chelating agent with the residues. Even if solidification can be performed, if the solidified state of the residues is bulky (becomes a large lump), problems remain in handling and conveyance.
Furthermore, there is also a problem that such a solidification treatment method is preferably performed continuously instead of a batch method even in view of economy.

  In view of the prior art, the present invention makes it possible to insolubilize heavy metals and the like by continuous operations on waste residues mainly composed of earth and sand containing combustible materials obtained by sorting by existing sorting means. The object is to make a granulated product while processing, to facilitate transport and handling, and to enable recycling including landfill.

In order to solve the above-mentioned problem, the waste residue treatment method according to the present invention is, as described in claim 1, a waste mainly composed of earth and sand obtained by sorting waste by an existing sorting means. A method for treating residue of matter,
When a predetermined amount of cement is supplied when the residues are conveyed on a conveyor,
Supply the residue and cement from the conveyor to a high-speed mixer having a conveying function and stir,
During the stirring, water and chelating agent are added,
The stirred mixture is supplied to the inside of one end of a cylindrical rotating drum and granulated while being guided by a spiral conveying partition wall,
The granulated solidified product is discharged from the other end of the rotating drum.
It is characterized by that.

In order to achieve the above object, the granulator according to the present invention, in order to achieve the above-mentioned object, can be used as a cement for residues mainly composed of earth and sand obtained by sorting waste by existing sorting means. A granulator used for granulation of a mixture obtained by adding water, a chelating agent and stirring and mixing,
A cylindrical rotating drum is rotatably provided,
Provided at one end of the rotating drum with a supply portion of the mixture, and provided with a discharge portion of the granulated material at the other end,
At least one spiral conveying partition wall is formed on the inner peripheral surface of the rotating drum at a predetermined height in the axial direction of the rotating drum and at a predetermined pitch interval in the axial direction. Provided,
It is characterized by that.

  According to the method for treating waste residues according to the present invention, cement residue using a high-speed mixer is mixed with waste residues mainly composed of earth and sand obtained by sorting by existing sorting means, In particular, the mixing of a small amount of chelating agent is carried out as if the amount was increased by adding water at the same time, and the efficiency of granulation by a rotating drum can be increased by stirring efficiently and mixing uniformly. In the rotating drum, it is possible to discharge the granulated material while growing agglomerates by granulating at a long distance by the spiral conveying partition wall, and since this is a rotating drum, such granulation should be performed continuously. As a result, it can be granulated while carrying out insolubilization treatment of heavy metals, etc. by continuous work, making it easy to transport and handle, and recycling processing including landfilling We were led to be in function.

The granulator has a simple structure called a rotary drum, and a granulated product is simultaneously formed on the rotary drum while a long granulation surface can be formed by providing a spiral conveying partition wall on the inner periphery. Since it can be transferred from one end to the other end, a granulated product can be formed by continuous treatment while sufficiently growing agglomerates.
Other specific advantages of the present invention will become apparent from the following description.

In the method of the present invention, in the implementation, the water may be 6 to 15 parts by weight, with the residues being 100 parts by weight, and the chelating agent may be 0.2 to 0.5 parts. preferable.
The above-mentioned water is the amount that the residues have as a total, and if the water content is high at the time of sorting, less water is added.
By setting it to such a numerical value, a granulating action appears favorably, and although the particle diameter is not uniform, a thing of 2 mm to 10 mm was obtained.
Of course, since the amount of the chelating agent is minimized as described above, the production cost of the granulated product can be reduced.

The cement is preferably 5 to 10 parts by weight, with the residues being 100 parts by weight.
By adopting such numerical values in the method of the present invention, it was possible to sufficiently solidify the granulated product while minimizing the amount of cement.

  Furthermore, the granulator used in this processing method comprises a cylindrical rotating drum that is rotated at a low speed by an electric motor, and one end of the rotating drum is provided with a charging unit for charging the mixture and the other end. Is provided with a discharge portion for discharging the granulated material, and at least one spiral conveying partition wall is provided on the inner peripheral surface of the rotating drum at a predetermined height in the axial direction of the rotating drum. And it is preferable to provide at predetermined pitch intervals toward the axial direction.

  As a granulator used for carrying out this method, a cylindrical rotating drum and a spiral conveying partition wall are provided so that sufficient granulation can be performed on the long spiral passage surface formed therein, while continuous granulation is performed. The particles can be discharged.

According to a fourth aspect of the present invention, it is preferable that a scraper for rectifying the mixture is provided in the supply unit in the vicinity of the inner peripheral surface of the rotating drum.
By providing the scraper in this way, the state in which the mixture discharged from the high-speed mixer tends to adhere and accumulate on the inner peripheral surface of the rotating drum can be eliminated, and granulation can be promoted.

Furthermore, the diameter of the rotating drum is 50 cm to 200 cm, the pitch interval in the axial direction of the conveying partition is 100 mm to 300 mm, and the number of spirals of the conveying partition over the entire length of the rotating drum is: It is preferably 10 to 25 times.
By setting such numerical values, it was possible to continuously achieve suitable granulation of residues of about 15 tons per hour.

  A preferred embodiment of a waste residue processing method and a waste residue granulator according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic plan view showing the installation of a granulator, a high-speed mixer, a high-speed mixer, and a conveyor for supplying residues and cement thereto. FIG. 2 is a schematic front view showing the installation of the high speed mixer and the conveyor, and FIG. 3 is a schematic front view showing the installation of the high speed mixer and the granulator.

  1 to 3, 1 is a conveyor for supplying residues and cement, 2 is a powder feeder, cement is supplied to the start end of the conveyor 1, and 3 is a loading conveyor, separately Residues that have been sorted by a sorting machine such as a screen (a small amount of heat loss such as combustible materials, preferably 5% or less) are supplied to the conveyor 1. Therefore, here, residues are supplied in a laminated state on a predetermined amount of cement.

Here, the supplied cement is a virgin cement of a kind such as Portland cement, which is 10 parts when compared with 100 parts by weight of residues. If the amount is 5 to 15 parts, the object of the present invention can be achieved.
Moreover, the moisture content of the residues supplied to the conveyor 1 is detected by a known sensor (not shown) (generally about 8% to 16%) and reflected in the subsequent water supply amount.

  Reference numeral 4 denotes a high-speed mixer, which is provided facing the terminal portion of the conveyor 1 and receives the conveyed residues and cement. Reference numeral 5 denotes a rotating drum constituting the granulator, which is rotationally driven by an electric motor. FIG. 3 is drawn so that the granulation time becomes longer by tilting the rotating drum 5 about 3 degrees (in the range of 2-5 degrees) with respect to the horizontal axis so that the mixture is returned to the start end side by gravity. (In other drawings, it is installed horizontally, but it can be granulated by this method). The high-speed mixer 4 has a structure that can be used for kneading self-hardening foundry sand, and has a structure that can rotate 480 to 1000 per minute by an electric motor 4C, and is configured as shown in FIGS. As a general structure, a screw 4A having a predetermined pitch is provided on the start end side inside a cylindrical shape, and residues and cement are supplied to this, and a plurality of paddle blades 4B are provided on the coaxial core wire with the screw 4A. These are arranged in a spiral shape in the axial direction, and can be discharged from the terminal end side while stirring and mixing the sent cement and residues.

  And here, as shown in FIG.4 and FIG.5, the chelating agent supply pipe | tube 6 and the water supply pipe | tube 7 are provided in the location where the said paddle blade | wing 4B is arrange | positioned. The chelating agent supply pipe 6 is connected to a chelating agent tank (not shown), and the water supply pipe 7 is connected to a water tank or a water source. Of course, these supply amounts are adjusted by a control valve. In particular, regarding the supply of water, the total moisture content is set to 10 parts here, based on the detection of the moisture content of the residues described above. Adjusted. In the illustration of the embodiment, water is supplied before the chelating agent, but it may be simultaneous or reverse.

The terminal portion of the high-speed mixer 4 faces the inside of the starting end portion of the rotating drum 5, and the mixture is discharged from here to the inside of the rotating drum 5.
Further, the high-speed mixer 4 is configured such that the discharge port can be swung, and the mixture can be discharged and supplied to a required portion on the inner periphery of the rotary drum 5 as necessary.

Here, the rotating drum 5 having a diameter of 1800 mm and a length of 3000 mm is used. On the inner peripheral surface of the rotating drum 5, spiral conveying partition walls 5 </ b> A are provided here at a pitch of 300 mm. Here, the height of the conveying partition wall 5A, that is, the length of the rotating drum 5 in the axial direction is set to 150 mm. A scraper 8 is provided inside the starting end of the rotating drum 5. As shown in FIGS. 7 and 8, the scraper 8 is provided in parallel to the axial direction of the rotating drum 5 so as to be in sliding contact with the inner peripheral surface of the starting end of the rotating drum 5, and has a length of about 400 mm. There is a degree, it is cantilevered outside the rotating drum 5, and the part which contacts the peripheral surface is made of rubber. The rotating drum 5 is set to rotate 14 times per minute. As a result, the peripheral speed of the drum is 80 m / min, and a speed suitable for granulation is obtained.
As shown in FIGS. 1, 3, and 7, the conveyance partition wall 5 </ b> A lacks only the arrangement portion of the scraper 8. In the drawing, three solid lines crossing the axis of the rotating drum 5 indicate joining ribs.

  With such an apparatus, a predetermined amount of cement is supplied when residues mainly composed of earth and sand obtained by sorting wastes by existing sorting means are transported by the conveyor 1 (residues are removed). 100 parts, 10 parts here), and the residues and cement are supplied from the conveyor 1 to a high-speed mixer 4 having a conveying function and stirred, and 8 parts of water (residues) are mixed during the stirring. 0.2 parts of chelating agent is charged, and the stirred mixture is supplied to the inside of one end of the cylindrical rotating drum 5 while being guided by the spiral conveying partition 5A. Granulation is performed, and the granulated solidified product is discharged from the other end of the rotating drum 5. At this time, the mixture rises by frictional resistance along the peripheral surface passage formed by the partition wall 5A for conveyance, descends by gravity, and granulation proceeds by repeating this, and simultaneously in the axial direction. Is transported.

Of course, it is sufficient that the water is appropriately adjusted in the range of 6 to 15 parts by weight with the residue being 100 parts by weight, and the chelating agent is 0.2 to 0.5 parts. Granulation individualization can be achieved.
In addition, the cement is sufficient for granulation if the amount of the residue is 100 parts by weight and 5 parts to 10 parts.

  The processing method and granulator of the present invention perform continuous granulation processing of residues and insolubilization processing of heavy metals etc. of the residues, so that appropriate processing such as landfill processing and recycling is possible, and various It can be applied to the waste residue.

The arrangement | positioning top view of the whole apparatus which shows the processing method concerning this invention. The arrangement | positioning front view of the principal part of the apparatus which shows the processing method concerning this invention. The arrangement | positioning side view of the principal part of the apparatus which shows the processing method concerning this invention. The partial cross section figure of the high-speed mixer of the apparatus which shows the processing method concerning this invention. The expanded sectional view of the principal part of the high-speed mixer of the apparatus which shows the processing method concerning this invention. The side view of the high-speed mixer of the apparatus which shows the processing method concerning this invention. The schematic front view of the rotating drum of the granulator which shows the processing method concerning this invention. The schematic side view of the rotating drum of the granulator which shows the processing method concerning this invention.

1: Conveyor 4: High-speed mixer 5: Rotating drum 5A: Transport partition 8: Scraper

Claims (7)

A waste residue treatment method mainly composed of earth and sand obtained by sorting waste by an existing sorting means,
When a predetermined amount of cement is supplied when the residues are conveyed on a conveyor,
Supply the residue and cement from the conveyor to a high-speed mixer having a conveying function and stir,
During the stirring, water and chelating agent are added,
The stirred mixture is supplied to the inside of one end of a cylindrical rotating drum and granulated while being guided by a spiral conveying partition wall,
The granulated solidified product is discharged from the other end of the rotating drum.
A method for treating waste residues.   2. The waste according to claim 1, wherein the water is used in an amount of 6 parts to 15 parts by weight, and the chelating agent is used in an amount of 0.2 parts to 0.5 parts. Residue processing method.   The waste cement treatment method according to claim 1 or 2, wherein the cement is used in an amount of 5 to 10 parts by weight, with the residues being 100 parts by weight. A granulator for use in the method for treating waste residues according to claim 1,
It consists of a cylindrical rotating drum that is rotated at a low speed by an electric motor,
One end of the rotating drum is provided with an input part for supplying the mixture, and the other end is provided with a discharge part for discharging the granulated product,
On the inner peripheral surface of the rotating drum, at least one spiral conveying partition wall is formed at a predetermined height in the axial direction of the rotating drum and at a predetermined pitch interval in the axial direction. Provided in the
A waste residue granulator characterized by that. A granulator used for granulation of a mixture obtained by adding cement, water, a chelating agent to a residue mainly composed of earth and sand obtained by sorting waste by existing sorting means, and stirring and mixing the mixture,
A cylindrical rotating drum is rotatably provided,
Provided at one end of the rotating drum with a supply portion of the mixture, and provided with a discharge portion of the granulated material at the other end,
At least one spiral conveying partition wall is formed on the inner peripheral surface of the rotating drum at a predetermined height in the axial direction of the rotating drum and at a predetermined pitch interval in the axial direction. Provided,
A granulator characterized by that.   The granulator according to claim 5, wherein a scraper for rectifying the mixture is provided in the supply unit so as to be close to a peripheral surface of the rotating drum.   The diameter of the rotating drum is 50 cm to 200 cm, the pitch interval in the axial direction of the conveying partition is 100 mm to 300 mm, and the number of spirals of the conveying partition over the entire length of the rotating drum is 10 times. The granulator according to claim 5 or 6, wherein the granulator is -25 times.

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