JP7301066B2 - Reclamation land production method - Google Patents

Description

The present invention relates to landfill development methods.
This application claims priority based on Japanese Patent Application No. 2018-203225 filed in Japan on October 29, 2018, the content of which is incorporated herein.

Coal ash and gypsum powder produced from coal-fired power plants and blast furnace slag powder produced from blast furnaces (hereinafter referred to as "coal ash, etc.") that have not been effectively used are disposed of at final disposal sites. disposed of in landfills. Final disposal sites include landfill sites and water surface landfill sites. There are two major final disposal methods: wet ash landfill, in which coal ash, etc. is humidified and then landfilled with a dump truck or bulldozer, etc., and slurry landfill, in which coal ash, etc. is mixed with water to form a slurry and then landfilled. separated.

In the conventional wet ash landfill method used at landfill sites, coal ash, etc., which has been moistened by power plant ancillary equipment, is transported to the landfill site by dumping, etc., and then compacted and compacted by a bulldozer before landfilling. rice field. However, in the conventional wet ash landfill method, the landfill density of the wet ash cannot be increased sufficiently, and there is a problem that the landfill disposal site cannot be effectively used. In the conventional wet ash landfill method, when the surface of the landfilled wet ash dries, it becomes easy to scatter. It was necessary to provide a cover. “Same-day soil covering” refers to the soil covering that is placed on the surface of the waste after the day's work is completed. Intermediate covering soil refers to covering soil (approximately 50 cm) that is placed on the surface of each layer with a maximum thickness of 3 m or less when landfilling waste.

Patent Literature 1 discloses a method for disposing of incineration residues in a landfill site, which allows omission of an intermediate covering soil as a scattering prevention measure. In the disposal method for incineration residue disclosed in Patent Document 1, cement and water are added to the incineration residue to form a non-flowing plastic kneaded material, and the plastic kneaded material is layered to form a layered body. . Next, by applying planar vibration to the surface of this layered body, cement and water are permeated around the particles of the incineration residue, forming a fluid plastic fluid layer. By repeating this process, two or more solidification discs are piled up, and the incineration residue is disposed of.

JP 2015-073981 A

However, in the disposal method disclosed in Patent Document 1, although it is possible to omit the intermediate covering soil, adding an extra additive (cement) to the landfill target (incineration residue) increases the capacity. However, it cannot be said that it is sufficient from the viewpoint of effective utilization of the landfill disposal site, and it was difficult to adopt from the viewpoint of economic efficiency.

The present invention has been made in view of the above circumstances. The object is to provide a production method.

In order to solve the above problems, a method for producing reclaimed land according to one aspect of the present invention employs the following configuration.
[1] A method of producing reclaimed land by reclaiming a landfill site, comprising:
dividing the landfill area of the landfill site into landfill areas having the required volume;
After charging slurry produced from coal ash containing at least one of dry ash, wet ash and clinker ash into the landfill area,
A method of producing a landfill preparation comprising drying a slurry in said landfill area.
[2] The landfill land production method according to [1], wherein the landfill area is divided into the landfill areas by partitions.
[3] The method of producing a reclaimed land according to [2], wherein a ridge containing at least a part of the coal ash is used as the partition.
[4] The method for producing landfill land according to any one of [1] to [3], wherein the slurry has a coal ash water content of 35 to 40%.
[5] The landfill area is divided into one or more landfill areas, and the slurry is poured into one landfill area until the volume of the one landfill area is filled, and then the slurry is poured into another landfill area. The method of producing a reclaimed land according to any one of [1] to [4], wherein input is started.
[6] The landfill land production method according to any one of [1] to [5], wherein the shape of the landfill area is rectangular.
[7] The landfill land production method according to [6], wherein the landfill area is divided so that the landfill area has a grid pattern.
[8] Any one of [1] to [7], wherein after the slurry charged into the landfill area is dried, the landfill area is partitioned as a new landfill area, and the slurry is newly charged. 3. The method of producing a landfill development according to .
[9] The method for producing landfill land according to [8], wherein the coal ash moisture content after drying of the slurry charged into the landfill area is 27% or less.
[10] Install a transferable slurry production apparatus in a landfill area of a landfill site or land adjacent to the landfill area, and operate the transferable slurry production apparatus to generate the slurry, [1] to [9] The method for producing a reclaimed land according to any one of [9].
[11] After the transfer of the slurry from the transferable slurry production apparatus to the landfill area within a transportable range is completed, the operation of the transferable slurry production apparatus is stopped, and the transferable slurry production apparatus is restarted. While dividing into two or more aggregates,
The production method for a reclaimed land according to [10], wherein the transferable slurry manufacturing apparatus is transferred to a new installation site.

In the present invention, slurry produced from coal ash containing at least one of dry ash, wet ash and clinker ash is thrown into a landfill area having a required volume, and then the slurry in the landfill area is dried. Therefore, it can be landfilled with high density. Therefore, according to the method for producing a reclaimed land according to the present invention, it is possible to effectively utilize landfill disposal sites. In addition, since the surface after drying the slurry is solidified and no dust is generated, no measures are required to prevent the scattering of dust and the like.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view for explaining a first embodiment to which a method for producing reclaimed land according to the present invention is applied; 1 is a perspective view showing the configuration of a transferable slurry manufacturing apparatus applicable to the landfill land production method of the present embodiment; FIG. FIG. 2 is a side view showing the configuration of a transferable slurry production apparatus applicable to the landfill land production method of the present embodiment. It is an enlarged view of a mechanical level adjuster portion provided in the slurry production apparatus. FIG. 2 is a side view of a slurry production apparatus applicable to the landfill land production method of the present embodiment divided into units (aggregates). FIG. 2 is an enlarged plan view of a landfill area applicable to the landfill land production method of the first embodiment; It is a perspective view showing an example of the landfill method in the landfill land production method of the first embodiment. It is a perspective view showing an example of the landfill method in the landfill land production method of the second embodiment.

In the landfill land production method of the present invention, the method of slurry landfill, which has conventionally been used for landfill landfill sites, is newly applied to landfill landfill sites.
As used herein, "reclaimed land" refers to land that has one or more land layers filled with coal ash slurry. It also applies to the exposed land area after submerged landfill in water surface landfill sites.

<First Embodiment>
Hereinafter, the configuration of the first embodiment to which the landfill land production method of the present invention is applied will be described in detail with reference to the drawings together with the configuration of the landfill facility of the landfill disposal site and the transferable slurry production apparatus using this. to explain. In the drawings used in the following description, in order to make the features easier to understand, the characteristic parts may be shown enlarged for convenience, and the dimensional ratios of each component may not necessarily be the same as the actual ones.

(Landfill Equipment for Landfill Sites)
The configuration of a landfill facility (hereinafter simply referred to as "landfill facility") that can be applied to the production method for a landfill land according to the first embodiment (that is, the landfill method for a landfill site) will be described. FIG. 1 is a plan view schematically showing the configuration of a landfill facility 70 applicable to the landfill land production method of the present embodiment.

As shown in FIG. 1, the landfill facility 70 includes a slurry supply source (hereinafter sometimes referred to as a "slurry production apparatus") 1, and a slurry pump connected to a pipe L1 for deriving the coal ash slurry of the slurry production apparatus 1. 14, a transport pipe L2 extending from the slurry pump 14 to a landfill site, and a concrete pump truck 80 to which the tip of the transport pipe L2 is connected.
This landfill facility 70 is a facility for supplying slurry-like coal ash or the like (coal ash slurry) to an arbitrary landfill site in the landfill disposal site 60 .

The slurry supply source (slurry production apparatus) 1 uses coal ash containing at least one of dry ash, wet ash, and clinker ash as a raw material to landfill a landfill disposal site 60, that is, coal used for producing landfill land. An apparatus for producing ash slurry.

Coal ash used as a raw material is generally classified into fly ash and clinker ash. In this specification, fly ash refers to coal ash discharged from a coal-fired power plant, and mechanical dust collectors such as electric dust collectors, cyclones, and bag filters installed in the flue (hereinafter, simply (referred to as "dust collector"). Clinker ash is coal ash that adheres to and is discharged from the furnace bottom or furnace wall among coal ash discharged from a coal-fired power plant, and indicates sand or gravel.

The fly ash mentioned above is further classified into dry ash and wet ash. In this specification, the dry ash refers to the above-mentioned fly ash, which has been discharged from a dust collector and which has not absorbed moisture. Wet ash refers to coal ash (fly ash) that has been wetted into dry ash for transportation by gatt ships (ships without closed holds) or dump trucks, or fly ash that has been exposed to rainwater, etc. Shown is coal ash (fly ash) that has been wetted by drying.
Wet ash usually has a moisture content in the range of 15 to 30% by mass.

The location where the slurry supply source 1 is installed is not particularly limited. The slurry supply source 1 may be provided at any point within the landfill disposal site 60 or may be provided at any point on the land 61 adjacent to the landfill disposal site 60 .

The installation mode of the slurry supply source 1 is not particularly limited. The slurry supply source 1 may be permanently installed or temporarily installed. Above all, it is preferable that the slurry supply source 1 applied to the present embodiment is installed in a movable manner.
The configuration of a transferable slurry manufacturing apparatus suitable for this embodiment will be described later.

The slurry supply source 1 has a pipe L1 for leading out the generated coal ash slurry, as will be described later. This coal ash slurry lead-out pipe L1 is connected to a slurry pump (slurry pumping device) 14 . The slurry pump 14 has the necessary discharge pressure to push the coal ash slurry from the outlet of the slurry source 1 to the slurry discharge. As the slurry pump 14, a general hydraulic piston double pump, an amphibious sand pump, or the like can be used.

The transport pipe (slurry transport pipe) L2 transports the coal ash slurry pressure-fed from the slurry supply source 1 to the concrete pump truck 80 arranged at an arbitrary landfill site in the landfill disposal site 60 . That is, the transport pipe L2 is a pipe provided between the slurry pump 14 and the concrete pump truck 80. As shown in FIG. A proximal end of the transport pipe L2 is connected to the slurry pump 14 . The tip of the transport pipe L2 is connected to the hopper portion of the concrete pump truck 80 as described later. As a result, the coal ash slurry produced by the slurry supply source 1 and pressure-fed by the slurry pump 14 can be supplied to any landfill site from the tip of the flexible hose connected to the concrete pump truck 80. As will be described later, in this embodiment, the tip of the flexible hose serves as a slurry discharge portion.

The length R of the transport pipe L2 is not particularly limited, but can be 50 to 500 m, more preferably 100 to 300 m. The transport pipe L2 may be configured by preparing a plurality of pipes having a required length and connecting them. With such a configuration, the transport pipe L2 can be easily extended to any landfill site in the landfill site 60 by increasing or decreasing the number of connected pipes.

The cross-sectional size of the transport pipe L2 is determined in consideration of the pressure loss of the pipe, which is determined by the amount of slurry supplied, the length of the transport pipe L2, etc., but is generally about 150A (pipe outer diameter 150 mm). A steel pipe, a flexible resin pipe, or a pipe having a flexible structure such as a corrugated pipe can be used. If a flexible material or structure is adopted, the transport tube L2 can be easily moved.

"Transferable slurry production equipment"
The configuration of a transferable slurry production apparatus (hereinafter simply referred to as "slurry production apparatus") 1 suitable as a slurry supply source applied to the landfill land production method of the present embodiment will be described. FIG. 2 is a perspective view showing the configuration of a slurry production apparatus 1 applicable to the landfill land production method of the present embodiment. FIG. 3 is a side view showing the configuration of a slurry production apparatus 1 applicable to the landfill land production method of the present embodiment.

As shown in FIGS. 2 and 3, a slurry production apparatus 1 applicable to the landfill land production method of the present embodiment includes, as main equipment, a support base 2, a support frame 3, and a high-speed kneading mixer (stirring device). 4, and optional equipment includes a belt conveyor (raw material conveying equipment) 5, a material receiving hopper (raw material input equipment) 6, a slurry hopper 7, and stairs 8 (8A, 8B). In the slurry manufacturing apparatus 1 , the main equipment described above is placed on the support base 2 .

The support base 2 supports each component of the slurry manufacturing apparatus 1 (support frame 3, high-speed kneading mixer 4, belt conveyor 5, material receiving hopper 6, slurry hopper 7, and stairs 8) directly or via the support frame 3. It is a foundation provided for indirect support. Specifically, as the support base 2, as shown in FIG. 2, a laying iron plate laid on the ground can be used. Since the slurry manufacturing apparatus 1 of this embodiment uses the support base 2 and has a configuration in which the main equipment described above is placed on the support base 2, it can be installed even on a place where the ground is not solid and stable.
The size of the support base 2 is not particularly limited, and can be appropriately selected according to the size of the slurry production apparatus 1 . Specifically, for example, the width can be about 6.0 to 7.5 m, and the length can be about 15.0 to 17.1 m. In this embodiment, the size of the support base 2 is set to 6.0 m in width and 15.0 m in length.
The thickness of the support base 2 can be appropriately selected according to the total amount of the constituent members of the slurry manufacturing apparatus 1 so as not to cause warping or deformation. Specifically, for example, it can be about 2.2 to 2.5 cm.

As shown in FIG. 3, the support base 2 is composed of two support base members (iron plates) 2A and 2B from the viewpoint of ease of transportation when disassembling and relocating the slurry manufacturing apparatus 1. . The support base members 2A and 2B may be independent members, or may be connected (fastened) to each other so as to freely select between fixation and fixation release. The number of supporting base members 2A and 2B is preferably two, or may be one, from the standpoint of placing the entire main equipment, loading onto a vehicle for transportation, and ensuring maximum ground contact pressure.
The support base members 2A and 2B may be formed by welding a plurality of iron plates from the viewpoint of loading on a vehicle such as transportation. The size of each iron plate can be determined according to the size of the support base 2 (support base members 2A and 2B). Preferably.
When the slurry manufacturing apparatus 1 is relocated, the supporting base members 2A and 2B can be transported after separating the welded portions, and re-welded and installed after the relocation.
Since the slurry production apparatus 1 applied to this embodiment is lightweight, it is not necessary to use a fixed foundation such as a pile or a concrete plate. Therefore, it is easy to transport when disassembling and relocating the slurry manufacturing apparatus 1 .

As shown in FIGS. 2 and 4, a plurality of mechanical level adjusters 9 (eight locations in this embodiment) are provided on the support base 2 . The support base 2 and the support frame 3 are fixed in a state of being connected via a mechanical level adjuster 9 .

As shown in FIG. 4, the mechanical level adjuster 9 comprises a level adjusting base plate 9A made of H-shaped steel and adjusting bolts 9B. By providing the mechanical level adjuster 9, misalignment can be prevented when connecting the support frame 3 on the support base 2. FIG. Furthermore, the adjustment bolts 9B facilitate the level adjustment of the mechanical equipment in units of mm.
The support base 2 and the support frame 3 are not completely fixed by welding or the like, but can be freely selected to be fixed or released by fastening with bolts or the like.

The support frame 3, as shown in FIGS. 2 and 3, is provided to support (fix) the components of the slurry manufacturing apparatus 1 (for example, the high-speed kneading mixer 3, etc.) at a predetermined position (height). It is a frame (skeleton). H-section steel, for example, can be used as the support frame 3 .

As shown in FIG. 3, the support frame 3 is composed of a plurality of support frame parts 3A to 3D from the viewpoint of ease of transportation when the slurry manufacturing apparatus 1 is disassembled and relocated. Also, the configuration of each of the support frame portions 3A to 3D is not particularly limited, and can be appropriately selected according to the required shape, strength, and the like.

Specifically, the support frame parts 3A to 3D are made of H-shaped steel, and the basic structure is such that four of them are arranged vertically to form a column, and four of them are stretched over the column in a parallel direction to form a girder. . If necessary, braces are provided between columns and girders to diagonally span H-beams.

The support frame portions 3A to 3D may be independent members, or may be connected (fastened) to each other so as to freely select whether to fix or release the fixation. The method of connecting the support frame portions is not particularly limited, and for example, a method of fixing H-section steels together with bolts can be used.

As shown in FIGS. 2 and 3, the support frame 3 is provided with a plurality of working floors (scaffolding) 10 (three locations in this embodiment). Furthermore, by detachably spanning the stairs 8 (8A, 8B) between the work floor 10 and the support base 2, the worker can reach the work floor 10 provided at a position higher than the ground. can go. As a result, it is possible to improve workability such as confirmation of the operating condition. A work floor 10 is preferably provided with a safety fence 11 .

The high-speed kneading mixer 4 is a stirring device that kneads coal ash, which is a combination of one or more of dry ash, wet ash, and clinker ash, with water to produce slurry.
As the high-speed kneading mixer 4, specifically, a vertical mixer such as an HF mixer (manufactured by Taiheiyo Kiko Co., Ltd.) can be used. The high-speed kneading mixer 4 is not limited to a vertical mixer, and may be a horizontal mixer or a mixer whose rotation axis is inclined between the vertical direction and the horizontal direction. The high-speed kneading mixer 4 may have a function of adjusting the mixing ratio of coal ash and water to an appropriate range.

The capacity of the high-speed kneading mixer 4 is not particularly limited, and can be appropriately selected depending on the amount of slurry to be produced. Specifically, for example, it can be about 0.5 to 2.0 m ³ .

The high-speed kneading mixer 4 is provided at a position relatively higher than the ground in order to provide a space for installing the slurry hopper 7 below the high-speed kneading mixer 4 . Specifically, the high-speed kneading mixer 4 is supported by the support frame portion 3B so that the inlet side of the raw coal ash is upward and the outlet side of the produced slurry is downward. The support frame portion 3B is provided on the support frame portion 3A so that the high-speed kneading mixer 4 is above the slurry hopper 7. As shown in FIG.

A raw material introduction guide mechanism 12 and a water supply mechanism 13 are provided above the high-speed kneading mixer 4 . A steel chute can be used as the raw material introduction guide mechanism 12 . A steel pipe can be used as the water supply mechanism 13 . As a water supply source for the water supply mechanism 13, a submersible pump and a water tank can be used. The connection between the slurry production apparatus 1 and the water supply source is performed by steel piping. A water supply source is arranged adjacent to the slurry production apparatus 1 . The water supply source may be placed within a range where water can be supplied to the water supply mechanism 13 , and the water supply source does not have to be placed on the support base 2 . As a result, the weight of the support base 2 that supports the main devices can be reduced, and the maximum ground pressure, which will be described later, can be reduced.

The high-speed kneading mixer 4 is preferably capable of high-speed stirring in order to increase the productivity of coal ash slurry production. The range of high-speed stirring is not particularly limited. For example, in the case of a vertical mixer, the rotation speed is preferably 130 rpm or more, more preferably 140 rpm or more, by inverter control or the like. It is more preferable to set the rotational speed to 150 rpm or more. In this case, in batch-type slurry production, the slurry can be produced in a kneading time of 30 seconds or less, more preferably 15 seconds or less.

When wet ash and clinker ash piled up in an ash temporary storage area 40 as shown in FIG. It is a conveying facility for conveying to a raw material introduction guide mechanism 12 provided at the inlet of the stirring mixer 4 . The belt conveyor 5 is detachably supported between the support frame portions 3B and 3C in an inclined state so that the raw material introduction guide mechanism 12 side is higher.

The use of the belt conveyor 5 eliminates the need for the worker to carry the raw material to the input port of the high-speed kneading mixer 4, thereby improving working efficiency. In addition, by measuring the operation time when the raw material is conveyed to the raw material introduction guide mechanism 12 by the belt conveyor 5, the amount of raw material to be introduced can be measured. Furthermore, when wet ash and clinker ash piled up in the temporary ash storage site 40 are used as raw materials as described above, a silo for storing fly ash is not necessary. This eliminates the need for a silo for storing fly ash and an ash metering feeder provided in a conventional slurry production apparatus, so that the size of the slurry production apparatus 1 can be reduced.

The material receiving hopper 6 is provided for loading the raw material onto the belt conveyor 5 when wet ash and clinker ash piled up in the open are mainly used as the raw material among the coal ash used as the raw material. Equipment. The material receiving hopper 6 is supported by the support frame portion 3D.
The support frame portion 3D is provided on the support frame portion 3C so that the material receiving hopper 6 is above the loading surface of the belt conveyor 5. As shown in FIG.

By providing the material receiving hopper 6 in this way, the raw materials that are thrown in from the opening provided above the material receiving hopper 6 using a heavy machine such as a backhoe or an excavator are stored, and the material is stored downward. Raw materials can be dropped onto the loading surface of the belt conveyor 5 through the provided opening.
By providing, for example, a scraping plate-like member between the belt conveyor 5 and the material receiving hopper 6, the thickness of the coal ash loaded on the belt conveyor 5 can be made uniform. By keeping the cross-sectional area (thickness) of the coal ash loaded on the belt conveyor 5 constant in this way, the amount of coal ash fed into the high-speed kneading mixer 4 can be accurately controlled depending on the operating time of the belt conveyor 5. It becomes possible to

The slurry hopper 7 is equipment for temporarily storing coal ash slurry produced by the high-speed kneading mixer 4 . The slurry hopper 7 is supported by the support frame portion 3A. A coal ash slurry lead-out pipe L1 is connected to the lower portion of the slurry hopper 7 so that coal ash slurry can be supplied to the secondary side of the slurry production apparatus 1 . By providing the slurry hopper 7, the coal ash slurry can be stably supplied from the slurry production apparatus 1. FIG.

Stairs 8 ( 8 A, 8 B) span between the support base 2 and the support frame 3 in order to climb a working floor 10 provided on the support frame 3 . Specifically, the stairs 8A are provided between the support base member 2B and the support frame portion 3D. The stairs 8B are provided between the support base member 2A and the support frame portion 3B. Thereby, the worker can safely go on the work floor 10 provided at a position higher than the ground. The stairs 8 are detachably fixed to the support base 2 and the support frame 3 by, for example, fastening with bolts. Thereby, when the slurry manufacturing apparatus 1 is dismantled, it can be removed freely.

The slurry production apparatus 1 applicable to this embodiment has a maximum ground pressure of 0.5 kgf/cm ² or less, preferably 0.43 kgf/cm ² or less, and 0.22 kgf/cm ² or less. is more preferable, and 0.1 kgf/cm ² or less is even more preferable. When the maximum ground pressure of the slurry production apparatus 1 is 0.5 kgf/cm ² or less, the slurry production apparatus 1 can be installed on any ground that is not hard and stable but on which a marsh bulldozer can enter. . Therefore, the installation location for installing the slurry manufacturing apparatus 1 of the present embodiment is not limited to a location that was land before the start of landfill processing, and a location where one or more landfill processing has already been completed in a landfill disposal site, which will be described later. (i.e. landfill land).
The maximum ground pressure of the slurry production apparatus 1 is determined by the total weight (load) of the slurry production apparatus 1 including the support base 2 /the area of the support base 2 . In this embodiment, the mechanical load of the slurry production apparatus 1 is 35,513 kg, and the load of the slurry production apparatus 1 including the load is 122 kN. The area of the support base 2 is 90 m ² . From this, the maximum ground pressure of the slurry manufacturing apparatus 1 is 122 kN/90 m ² =1.35 kN/m ² (=0.0135 kgf/cm ² ).

In this way, by installing the slurry production apparatus 1 at any point in the landfill disposal site 60 or on the land 61 adjacent to the landfill disposal site 60, the supply capacity of the slurry pump is not particularly increased. Furthermore, the coal ash slurry can be stably supplied without particularly extending the slurry transport pipe. Moreover, since the slurry transport pipe can be shortened, the risk of coal ash slurry clogging in the slurry transport pipe can be reduced.
The slurry production apparatus 1 of the present embodiment has been sufficiently studied for miniaturization and weight reduction, and can actually achieve a maximum ground pressure of less than 0.2 kgf/cm ² (0.194 kgf/cm ² ). .

The slurry manufacturing apparatus 1 applicable to the present embodiment includes a support base 2, a support frame 3, a high-speed kneading mixer 4, a belt conveyor 5, a material receiving hopper 6, a slurry hopper 7, and a step 8. , can be unlocked at any point. As for the support base 2 and the support frame 3, the connecting portions of the respective members can be unlocked at arbitrary points. The fixation can be released, for example, by loosening the bolt of the fastening portion. As a result, even after being installed once, the slurry manufacturing apparatus 1 of the present embodiment can be divided into two or more arbitrary units (aggregates), transported to a new installation location, and then installed again. can be done.

The slurry production apparatus 1 can be divided into two or more units. Each unit shall be an arbitrary combination selected from the support base members 2A and 2B, the frame members 3A to 3D, the stirring device 4, the belt conveyor 5, the material receiving hopper 6, the slurry hopper 7, and the stairs 8A and 8B. can be done.

The slurry manufacturing apparatus 1 can be divided into eight units 1A to 1H, for example.
Specifically, as shown in FIG. 5, the unit 1A has a schematic configuration including a support base member 2A, a support frame portion 3A, and a slurry hopper 7. As shown in FIG. The unit 1B has a schematic configuration including a support frame portion 3B, a stirring device 4, and a water supply mechanism 13. As shown in FIG. The unit 1C is generally configured with a raw material charging guide mechanism 12. As shown in FIG. The unit 1D is generally configured with a support base member 2B and a support frame portion 3C. The unit 1E is generally configured with a support frame portion 3D and a material receiving hopper 6. As shown in FIG. The unit 1F is composed of a belt conveyor 5. As shown in FIG. Unit 1G is composed of stairs 8A. Unit 1H consists of stairs 8B. In this embodiment, the weight of the unit 1B including the stirrer 4 is approximately 17 tons.

The unit division number of the slurry manufacturing apparatus 1 is an example, and is not limited to this. For example, the number of units may be less than eight by leaving the stairs 8A, 8b attached to the support base members 2A, 2B. By separating the support base members 2A, 2B and the support frame portions 3A, 3C, the number of units may exceed eight. The unit division position of the slurry manufacturing apparatus 1 is an example, and is not limited to this. The position of division for each member of the support base 2 and the support frame 3 is an example, and is not limited to this.

By the way, the conventional slurry production equipment is a large-scale construction equipped with a plurality of kneading devices such as a large silo material storage facility, a weighing device such as a load cell, a spiral pin mixer for kneading materials, and a flow jet mixer. was a thing. Therefore, it was difficult to dismantle and relocate the conventional slurry manufacturing apparatus after installation.

On the other hand, since the slurry manufacturing apparatus 1 described above can be disassembled into two or more units, even after being installed once, it can be disassembled into units and transferred to another location. Therefore, the slurry production apparatus 1 can be relocated to the next landfill site without increasing the supply capacity of the slurry pump or extending the slurry transport pipe, thereby producing coal ash slurry. can be stably supplied.
Moreover, since the slurry transport pipe can be shortened, the risk of coal ash slurry clogging in the slurry transport pipe can be reduced.

In the slurry manufacturing apparatus 1 described above, the configuration including the belt conveyor 5 has been described as an example, but the configuration is not limited to this, and the raw materials are directly added to the high-speed kneading mixer 4 except for the belt conveyor 5 and the material receiving hopper 6. may be This makes it possible to further reduce the size and weight of the transferable slurry manufacturing apparatus.

Although the slurry manufacturing apparatus 1 described above has been described as an example of a configuration using wet ash and clinker ash as raw materials, the configuration is not limited to this, and may be configured using dry ash. Specifically, a coal ash (dry ash) silo may be provided above or to the side of the high-speed kneading mixer 4 .

"Method for producing coal ash slurry"
A method for producing a coal ash slurry using the slurry production apparatus 1 described above will be described by taking as an example a case where wet ash and clinker ash are used as raw materials.
The slurry production apparatus 1 applicable to this embodiment can use wet ash and clinker ash as raw materials for the coal ash slurry. Unlike dry ash, it does not require large silos to store raw materials. For example, as shown in FIG. 1, an ash temporary storage site 40 can be provided next to the transferable slurry manufacturing apparatus 1 for storage.

First, wet ash and clinker ash, which are raw materials, are put into the material receiving hopper 6 . Specifically, for example, wet ash and clinker ash that are piled up outdoors are transported by a backhoe, an excavator, or the like. Next, a certain amount of raw material is supplied from the material receiving hopper 6 to the loading surface of the belt conveyor 5 .

By operating the belt conveyor 5 , the loaded raw material is conveyed to the raw material introduction guide mechanism 12 provided at the inlet of the raw material kneading mixer 4 , and a predetermined amount of raw material is supplied to the high speed kneading mixer 4 . Although the slurry manufacturing apparatus 1 of this embodiment does not include a weighing device, it is possible to measure the amount of raw material input by measuring the operation time of the belt conveyor 5 when conveying the raw material. Next, water is supplied from the water supply mechanism 13 into the high-speed kneading mixer 4 . Although it is not necessary to strictly control the amount of raw material and water supplied to the high-speed kneading mixer 4, it is possible to measure the moisture content of the raw material several times a day and correct it based on the measured value. preferable.

A high-speed kneading mixer 4 is operated to produce a coal ash slurry. When the high-speed kneading mixer 4 is a vertical mixer, one batch of coal ash slurry can be produced in about 7 to 15 seconds by setting the rotational speed to 130 to 156 rpm by inverter control. The quality of the slurry to be produced may be within a range in which clogging of the coal ash slurry does not occur in the slurry transport pipe, and it is not necessary to knead until there are no lumps.

In the landfill land production method of the present embodiment, the water content ratio of the coal ash slurry is not particularly limited as long as the blend is such that a large amount of bleeding does not occur. Specifically, the water content ratio of the coal ash slurry is preferably 35% or more and 40% or less. If the water content ratio of the coal ash slurry is within the above range, bleeding is less likely to occur, and the landfill density increases as the water content ratio decreases, which is preferable.

The produced coal ash slurry is transferred from the high-speed kneading mixer 4 to the slurry hopper 7 and temporarily stored. Then, the coal ash slurry can be supplied to the secondary side of the slurry production apparatus 1 from the coal ash slurry lead-out pipe L1 provided in the lower part of the slurry hopper 7 according to the request of the landfill facility 70 .

(Method of producing reclaimed land)
A configuration of a production method for reclaimed land, which is an embodiment to which the present invention is applied, will be described. The landfill land production method of the present embodiment is a method of producing a landfill land using the landfill equipment 70 described above (that is, a landfill landfill disposal method).

The landfill site production method of the present embodiment includes a step (first step) of dividing the landfill area of the landfill site 60 into one or more landfill areas having a required volume (first step); manufacturing equipment) 1 and piping (second step), operating the slurry manufacturing equipment 1 to generate slurry of coal ash (third step), and any landfill from the slurry manufacturing equipment 1 a step of charging a slurry (coal ash slurry) produced from coal ash containing at least one of dry ash, wet ash and clinker ash into the region until the volume of the landfill region is filled (fourth step); and a step of drying the slurry in the landfill area (fifth step), and the above third to fifth steps are repeated until the charging of the slurry into the partitioned landfill area is completed.
Each step will be described in detail below.

"First step"
Landfill site 60 is subdivided into one or more landfill areas having required volumes.
Specifically, as shown in FIG. 1, a passage R is provided across the landfill disposal site 60, and the passage R is divided into substantially rectangular landfill areas AD. Next, each landfill area A to D is partitioned (divided) into landfill areas (1) to (8), respectively. In each landfill area A-D, each landfill area (1)-(8) is a landfill unit. FIG. 6 is an enlarged view of the landfill area A applied to the method of producing landfill land according to the present embodiment.

FIG. 7 is a perspective view showing an example of the configuration of a landfill area applicable to the landfill land production method of the present embodiment. As shown in FIG. 7 , the landfill area ( 1 ) of the landfill area A is partitioned by partitions (banks) 30 . The partition 30 is a weir constructed at a predetermined height by a construction machine such as a backhoe.

The partition 30 that divides the landfill area is not particularly limited as long as it functions as a side wall of the landfill area when the slurry is charged. As the partition 30, a bank provided to surround the landfill area A-(1) can be used.

The material of the partition 30 is not particularly limited. The material of the partition 30 preferably contains at least a part of the same coal ash as the slurry to be thrown into the landfill area A-(1), more preferably made of only coal ash.

The shape of the landfill area is not particularly limited. As shown in FIG. 7, when it is assumed that the slurry put into the landfill area A-(1) is spread to a uniform thickness using a concrete pump truck 80, the shape of the landfill area A-(1) is as follows. A rectangular shape surrounded by a partition 30 is preferable.

The height H of the partition 30 (height from the landfill surface) is not particularly limited, and can be appropriately selected according to the water content of the coal ash slurry used for landfill.

As a result of examination by the present inventors, when the water content ratio of the coal ash slurry is within the range of 35 to 40%, even if a heavy machine or the like is placed on the landfilled slurry, the ground will not liquefy. % is shown in Table 1.

As shown in Table 1, when slurry landfill is carried out at the landfill site 60, if the slurry thickness is increased (for example, slurry thickness: 50 cm), it takes a lot of water to dry to a water content of 26 to 27%. It takes days. On the other hand, if the slurry is landfilled so as to have a slurry thickness of about 30 cm, it will dry to a moisture content of 26-27% in about 7-8 days (that is, the landfill part will harden).

Therefore, the height (height from the landfill surface) H of the partition 30 can be 10 to 60 cm when the water content ratio of the coal ash slurry used for landfill is within the range of 35 to 40%. It is preferably 20 to 40 cm.

The width W of the partition 30 is not particularly limited, and can be appropriately selected according to the size of the concrete pump truck 80 used for land reclamation. The width W of the partition 30 can be 5 to 60 m. For example, when a 90 to 110 m ³ /h class concrete pump truck 80 is used, the arm length of the concrete pump truck 80 is 25 m, so the width W is preferably a multiple of 25 m or 50 m. .

The length L of the partition 30 is not particularly limited, and can be appropriately selected according to the daily production volume of the slurry manufacturing apparatus 1, which is the slurry supply source. The length L of the partition 30 can be 10 to 120 m. For example, when using a slurry manufacturing apparatus 1 with a daily production volume of 400 m ³ and reclaiming with a slurry thickness of 30 cm and a width W of the partition 30 of 25 m, the length L can be approximately 55 m. If the partition 30 has a width W of 50 m and is landfilled, the length L can be about 25 m.

That is, the size (L×W×H) of the landfill area is designed so that the volume of the landfill area partitioned by the partition 30 and the daily production volume of the slurry production apparatus 1, which is the slurry supply source, match. is preferred.

In the landfill areas A to D, it is preferable to partition the landfill areas (1) to (8) so that each landfill area has a grid pattern. When each landfill area is divided to partition the landfill area, the partition 30 can be shared between adjacent landfill areas by using the partition 30, so there is no need to provide a separate partition 30 for each landfill area. Eliminates and is efficient.

When dividing each landfill area A to D to divide the landfill area, the number of divisions is not particularly limited, but the water content ratio of the coal ash slurry used for landfill is within the range of 35 to 40%, and the slurry thickness is about 30 cm. Since it will dry in about 7 to 8 days when landfilled in such a way that it is divided into 8 parts, it is preferable. As a result, when the landfill areas (1) to (8) are filled in order from the landfill area (1), the first landfill area (1) is completely dried after 8 days. It can be landfilled again by charging coal ash slurry.

When each landfill area A to D is divided into landfill areas (1) to (8), the shape of each landfill area (1) to (8) is not limited. The landfill areas (1) to (8) may all have the same shape, or may have different shapes. For example, as shown in FIG. 6, a combination of two types of shapes may be used. Specifically, in the landfill area A shown in FIG. ) has a size (L×W×H) of 50 m×50 m×0.3 m.

"Second process"
As shown in FIG. 1, a point P1 near the center of the divided landfill areas A to D on the passage R provided in the center of the landfill disposal site 60 is selected as the installation location, and the A slurry production apparatus (removable slurry production apparatus) 1 shown in Fig. 1 is installed.
Specifically, as shown in FIG. 5, eight divided units 1A to 1H of the slurry manufacturing apparatus 1 are transported by trucks and unloaded by cranes to assemble the units 1A to 1H. At that time, as shown in FIG. 4, it is preferable to adjust the level of the mechanical equipment in units of mm using the adjustment bolts 9B.

As shown in FIGS. 1 and 6 , a coal ash slurry lead-out pipe L 1 provided at the bottom of the slurry hopper 7 of the slurry production apparatus 1 is connected to the slurry pump 14 . Next, the transport pipe L2 connected to the slurry pump 14 is arranged to the landfill area (1) of the landfill area A.
Specifically, a plurality of pipes with a length of about 4 m are prepared and connected to extend to the landfill area (1).

The tip of the transport pipe L2 is placed in the hopper portion of the concrete pump truck 80 placed at the position (a) shown in FIG. Then, the end of the flexible hose connected to the concrete pump truck 80 is placed inside the partition 30 of the landfill area A-(1).

"Third process"
A slurry of coal ash is produced by operating the slurry production apparatus 1 .
Specifically, first, as shown in FIGS. 1, 2 and 3, the wet ash and clinker ash piled up in the temporary ash storage area 40 are transported to the material receiving hopper 6 by a backhoe, excavator or the like. Next, a certain amount of raw material is supplied from the material receiving hopper 6 to the loading surface of the belt conveyor 5 .

A belt conveyor 5 is operated to supply a predetermined amount of raw material to a high-speed kneading mixer 4 .
By measuring the operation time of the belt conveyor 5 when conveying the raw material, the input amount of the raw material is measured. Next, water is supplied into the high-speed kneading mixer 4, and the high-speed kneading mixer 4 is operated to produce a coal ash slurry having a water content within the range of 35 to 40%. One batch of coal ash slurry can be produced in about 15 seconds.

The produced coal ash slurry is transferred from the high-speed kneading mixer 4 to the slurry hopper 7 and temporarily stored. Then, as shown in FIG. 1, the coal ash slurry is supplied from the coal ash slurry lead-out pipe L1 provided in the lower part of the slurry hopper 7 to the transport pipe L2 via the slurry pump 14. As shown in FIG.

"Fourth process"
Coal ash slurry is charged from the slurry manufacturing apparatus 1 into one of the landfill areas until the volume of the landfill area is filled.
Specifically, the coal ash slurry is discharged from the concrete pump truck 80 installed at the position (a) shown in FIG. Pour in the ash slurry. The coal ash slurry poured into the compartment spreads naturally due to its own fluidity, but the surface of the slurry naturally has a gradient of about 1/10 to 1/20, so the tip of the boom of the concrete pump 80 Spread the slurry at the tip of the attached hose to make the thickness uniform.

When the boom range of the concrete pump truck 80 is 25m, the boom does not reach the lower half of the landfill area (1) after the upper half of the landfill area (1) (the shaded area shown in FIG. 6) is completed. Therefore, landfilling becomes impossible.

Therefore, the supply of the coal ash slurry from the slurry production apparatus 1 is temporarily stopped. Next, the connection between the concrete pump truck 80 and the slurry transport pipe L2 is released, and the concrete pump truck 80 is moved to the position (b) shown in FIG. The transport pipe L2 is extended to the position of (b) shown in FIG. Next, after connecting the tip of the transport pipe L2 to the hopper portion of the concrete pump truck 80 placed at the position (b), the supply of the coal ash slurry from the slurry manufacturing apparatus 1 is resumed, and the landfill area (1 ) will be filled in the lower half. In addition, do not remove the disconnected pipe from the site, but leave it in a place where it will not interfere with the work.

"Fifth step"
Dry the coal ash slurry that has been dumped into the landfill area.
Specifically, the coal ash slurry put into the landfill area is dried until the coal ash water content becomes approximately 27% or less. A method for drying the coal ash slurry is not particularly limited. Methods for drying the coal ash slurry include natural drying and drying using an air blower, and drying by natural drying is preferable. The number of days required for air-drying the coal ash slurry varies depending on the water content ratio of the initial coal ash slurry thrown into the landfill area and the thickness of the slurry put into the landfill area. As described above, if the water content of the coal ash slurry is in the range of 35 to 40% and the thickness of the slurry is about 30 cm, the water content is dried to about 26 to 27% by naturally drying for about 7 to 8 days. do.

According to the landfill land production method of the present embodiment, since no dust or the like is generated from the surface of the dried coal ash slurry, it is necessary to provide immediate covering soil or intermediate covering soil on the slurry surface as a measure to prevent scattering of dust and the like. There is no Therefore, since the work of providing cover soil becomes unnecessary, work efficiency is excellent, and the land landfill disposal site 60 can be effectively utilized by the capacity of the cover soil.

"Step 6"
In the reclaimed land production method of the present embodiment, the above-described fourth step is completed, and at the same time the transport pipe L2 is moved from the landfill area (1) of the landfill area A to the next landfill target. Move to area A-(2).
Specifically, after the landfilling of the landfilling area (1) is completed, the supply of the coal ash slurry from the slurry production apparatus 1 is temporarily stopped. Next, the connection between the concrete pump truck 80 and the slurry transport pipe L2 is released, and the concrete pump truck 80 is moved to the position (c) shown in FIG. The transport pipe L2 is extended to the position (c) shown in FIG. 6 by appropriately disconnecting the pipes constituting the transport pipe L2 and reconnecting them at an arbitrary position. Next, after placing the tip of the transport pipe L2 in the hopper portion of the concrete pump truck 80 placed at the position (c), the supply of the coal ash slurry from the slurry production apparatus 1 is resumed, and the landfill area (2 ) (25m x 110m x 0.3m) to fill the upper half. In addition, do not remove the disconnected pipe from the site, but leave it in a place where it will not interfere with the work.

After the landfilling of the upper half of the landfilling area (2) is completed, supply of the coal ash slurry from the slurry production apparatus 1 is temporarily stopped. Next, the concrete pump truck 80 is disconnected from the slurry transport pipe L2, and the concrete pump truck 80 is moved to the position (d) shown in FIG. The transport pipe L2 is extended to the position (d) shown in FIG. 6 by appropriately disconnecting the pipes constituting the transport pipe L2 and reconnecting them at an arbitrary position. Next, after placing the tip of the transport pipe L2 in the hopper portion of the concrete pump truck 80 placed at the position (d), the supply of the coal ash slurry from the slurry production apparatus 1 is resumed, and the landfill area (2 ) will be filled in the lower half. Leave the disconnected pipes in a place that does not interfere with the work without removing them from the site.

As described above, in the landfill land production method of the present embodiment, the above-described third to sixth steps are repeated until slurry injection into the partitioned landfill areas (1) to (8) of the landfill area A is completed. .
Specifically, for the landfill areas (3) and (4) shown in FIG. 6, the above-described landfill areas (1) and (2) are Land reclamation will be carried out in the same way as
The reclamation areas (5) to (8) (50 m×50 m×0.3 m) shown in FIG. 6 are reclaimed in two steps in the same manner as the above-described reclamation areas (1) to (4). At that time, the installation location of the concrete pump truck 80 is not particularly limited as long as it is adjacent to the landfill areas (5) to (8).
After the landfilling of all the landfill areas (1) to (8) of the landfill area A is completed, the other landfill areas B, C, and D are similarly divided into the partitioned landfill areas (1) to (8). Landfill.

"Step 7"
In the landfill land production method of the present embodiment, the first layer of landfill in each landfill area (1) to (8) of all landfill areas A to D is completed (slurry put into the landfill area is dried). After that, new landfill areas (1) to (8) are defined on the landfill areas A to D, respectively, and slurry is newly charged.
Specifically, the first step and the third to sixth steps are repeated. In this way, by stacking the second and subsequent layers in the landfill areas (1) to (8) of the landfill areas A to D, it is possible to produce landfill land.

"8th step"
In the landfill land production method of the present embodiment, as shown in FIG. 0.9 m for three layers) is completed (that is, when the slurry is completely transferred from the slurry production apparatus 1 installed at the point P1 to all landfill areas within a transportable range) ), the operation of the slurry production apparatus 1 is stopped, the slurry production apparatus 1 is divided into two or more aggregates, and the slurry production apparatus 1 is transferred to a new installation site P2 of the landfill disposal site 60 .

Specifically, as shown in FIG. 5, the slurry production apparatus 1 is divided into eight units 1A to 1H, and the slurry production apparatus 1 is moved to a new installation location different from the current installation location. For example, as shown in FIG. 1, the slurry production apparatus 1 can be installed at an installation location P2 away from the installation location P1 provided on the passage R of the landfill disposal site 60 . As a result, by installing the slurry manufacturing apparatus 1 at a place near the new landfill area to be landfilled, the landfill area within the new landfill area can be landfilled.

(Reclaimed land)
The landfill land obtained by the landfill land production method of the present embodiment has a landfill density of 1.18 t / 1.18 t / 1.18 t/ m ³ or more. The landfill density of the landfill site is preferably 1.20 t/m ³ or more, more preferably 1.22 t/m ³ or more.

The landfill land obtained by the landfill land production method of the present embodiment (that is, the landfill land after all the landfill is completed) has two or more layers of coal ash slurry when viewed in cross section in the thickness direction. , preferably 5 layers or more, more preferably 10 layers or more. Also, the thickness per layer is preferably in the range of 10 to 50 cm, more preferably in the range of 20 to 40 cm. Further, it is characterized in that no intermediate covering soil is provided between each layer.

As described above, according to the landfill land production method of the present embodiment, coal ash containing at least one of dry ash, wet ash, and clinker ash is produced as a raw material in a landfill area having a required volume. After the slurry is put in, the slurry in the landfill area is dried, so high-density landfilling is possible and the capacity of the landfill disposal site 60 can be effectively used. In addition, since the surface after drying the slurry is solidified and no dust is generated, it is not necessary to provide a soil cover as a measure to prevent scattering of dust and the like. Therefore, the landfill capacity of the landfill disposal site 60 can be effectively used by the amount of the covering soil, so that the life of the disposal site can be extended.

According to the method for producing landfill land according to the present embodiment, the slurry production apparatus 1 can be relocated to an installation location near the landfill site according to the landfill site. It can be about 100m. As a result, there is a low possibility that the coal ash slurry will clog the transport pipe L2, so there is no need to strictly control the slurry quality. That is, according to this embodiment, when producing coal ash slurry in the slurry production apparatus 1, it is not necessary to perform strict slurry quality control to prevent clogging of pipes, so production capacity can be increased. .

According to the method for producing a developed landfill of the present embodiment, a developed landfill with a landfill density of 1.18 t/m ³ or more can be obtained.

<Second embodiment>
A description will be given of the configuration of a second embodiment to which the landfill land production method of the present invention is applied. The method of producing a reclaimed land according to the second embodiment uses the concrete pump truck 80 in the method of producing a reclaimed land according to the first embodiment, but the concrete pump truck 80 is not used. are different. Specifically, in the reclaimed land production method of the second embodiment, the backhoe 90 is used to make the thickness of the coal ash slurry uniform by charging the coal ash slurry into the reclamation area from the tip of the transport pipe L2. This is an auxiliary mode. Accordingly, since the boom length of the concrete pump truck 80 and the arm length of the backhoe 90 are different, the size of the landfill area is changed when the landfill area is partitioned.
Therefore, in the reclaimed land production method of the present embodiment, the configuration different from that of the above-described embodiment will be described, and the description of the same configuration will be omitted.

"1st'process"
FIG. 8 is a perspective view showing an example of the configuration of a landfill area applicable to the landfill land production method of the present embodiment.
As shown in FIG. 8, the width W of the partition 30 is not particularly limited, and can be appropriately selected according to the size of the backhoe 90 that is used to assist in land reclamation. The width W of the partition 30 can be 5 to 50 m. For example, when using a ^0.75m3 class as the backhoe 80, the arm length of the backhoe 80 is 8.8m, so the width W is preferably double that, about 15m. The length L of the partition 30 can be 10 to 150 m. For example, when a slurry production apparatus 1 with a daily production volume of 400 m ³ is used and landfilled with a slurry thickness of 30 cm and a width W of the partition 30 of 15 m, the length L is preferably about 88 m.

In this embodiment, when each landfill area A to D is divided into landfill areas (1) to (8) as shown in FIG. It is preferable to set it as the shape of. Specifically, in the landfill area A-(1) shown in FIG. They may be of the same size.

"Second'process"
In the 2' step, the coal ash slurry lead-out pipe L1 provided in the lower portion of the slurry hopper 7 of the slurry production apparatus 1 is connected to the slurry pump 14. As shown in FIG. Next, the transport pipe L2 connected to the slurry pump 14 is moved to the landfill area (1) of the landfill area A. Next, as shown in FIG. 8, the tip of the transport pipe L2 is placed inside the partition 30 of the landfill area A-(1).

"3rd'process"
In the 3' step, the produced coal ash slurry is transferred from the high-speed kneading mixer 4 to the slurry hopper 7 and temporarily stored. Then, as shown in FIG. 1, the coal ash slurry is supplied from the coal ash slurry lead-out pipe L1 provided in the lower part of the slurry hopper 7 to the transport pipe L2 via the slurry pump 14. As shown in FIG.

"4th'process"
Coal ash slurry is charged from the slurry manufacturing apparatus 1 into one of the landfill areas until the volume of the landfill area is filled.
Specifically, as shown in FIG. 8, the coal ash slurry is discharged into the landfill area A-(1) from the tip of the transport pipe L2. The coal ash slurry discharged from the transport pipe L2 flows into the landfill area, but is deposited near the tip of the transport pipe L2.

After the coal ash slurry has been supplied to the landfill area A-(1), the supply of the coal ash slurry is temporarily stopped, and the tip of the transport pipe L2 and the backhoe 90 are moved to the next landfill area. By repeating these steps, each landfill area can be filled in the same manner as in the first embodiment.

According to the method of producing landfill land according to the present embodiment, as in the above-described embodiment, it is not necessary to take measures to prevent scattering of dust and the like, and the landfill disposal site can be effectively utilized. In addition, in this embodiment, the reclamation of each reclamation area can be performed only by the backhoe 90 without using a concrete pump vehicle.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. In the landfill land production method of the embodiment described above, an example of the layout of the landfill areas (1) to (8) of the landfill areas A to D was used, but the present invention is not limited to this.

The landfill disposal site applicable to the landfill land production method of the present invention may be land generated by reclaiming a water surface landfill disposal site. Furthermore, after slurry landfill is applied as a landfill method for a water surface landfill site, the produced land may be transferred to the landfill land production method of the present invention (that is, landfill landfill method for a landfill site). As a result, slurry landfill can be continuously performed from the water surface landfill site to the land landfill site.

In the landfill land production method of the above-described embodiment, an example of a configuration in which a transferable slurry manufacturing apparatus is applied as a supply source of coal ash slurry has been described, but the present invention is not limited to this. For example, when shifting from landfilling in a water surface landfill site to the landfill land production method of the present invention, a fixed (stationary) slurry production apparatus may be used as a coal ash slurry supply source. A combination of a fixed (stationary) slurry production apparatus and a concrete pump truck may be used as a coal ash slurry supply source.

According to the method for producing landfill land according to the present invention, it is possible to effectively utilize landfill sites. In addition, since the surface of the dried slurry is solidified and no dust is generated, no measures are required to prevent the scattering of dust and the like.

1 ... Transferable slurry production equipment (slurry production equipment, slurry supply source)
1A to 1H ... units (aggregates)
2... Supporting base 2A, 2B... Supporting base member (iron plate)
3... Support frame 3A to 3D... Support frame part 4... High-speed kneading mixer (stirring device)
5 … Belt conveyor (raw material conveying equipment)
6 ... Material receiving hopper (raw material input equipment)
7 Slurry hopper 8, 8A, 8B Stairs 9 Machine level adjuster 9A Level adjustment base plate 9B Adjustment bolt 10 Floor (scaffolding)
DESCRIPTION OF SYMBOLS 11... Fence 12... Raw material injection|throwing-in guide mechanism 13... Water supply mechanism 14... Slurry pump (slurry pumping apparatus)
30... Partition (Border)
40 Temporary ash storage site 60 Landfill site 61 Land 70 Landfill facility of landfill site (landfill facility)
80... Concrete pump car 90... Backhoe L1... Piping for deriving coal ash slurry L2... Transport pipe (slurry transport pipe)
R...Aisle

Claims (13)

A method of producing a reclaimed land by landfill landfill, comprising:
dividing the landfill area of the landfill site into landfill areas having the required volume;
mixing coal ash containing at least one of dry ash, wet ash and clinker ash discharged from a coal-fired power plant with water to produce a slurry having a coal ash water content of 35 to 40%;
throwing the produced slurry into the landfill area ;
A method of producing a landfill development comprising drying the slurry introduced into the landfill area until the surface of the slurry solidifies . 2. The landfill development production method of claim 1, wherein the landfill area is partitioned into the landfill area by partitions. 3. The method of producing a reclaimed land according to claim 2, wherein a ridge at least partially containing the coal ash is used as the partition. The landfill area is partitioned into one or more landfill areas, and after the slurry is injected into one landfill area until the volume of the one landfill area is filled, the slurry is started to be injected into other landfill areas. 4. The method of producing a reclaimed land according to any one of claims 1 to 3 , wherein 5. The method of claim 1 , wherein the landfill area is rectangular in shape. 6. The landfill development production method of claim 5 , wherein the landfill area is partitioned such that the landfill area is grid-like. 7. The landfill developed area according to any one of claims 1 to 6 , wherein after the slurry put into the landfill area is dried, the landfill area is partitioned as a new landfill area, and the slurry is newly put in. production method. 8. The method for producing landfill land according to claim 7 , wherein the coal ash water content after drying of the slurry introduced into the landfill area is 27% or less. 9. Any one of claims 1 to 8 , wherein a transferable slurry production apparatus is installed in a landfill area of a landfill site or land adjacent to the landfill area, and the slurry is produced by operating the transferable slurry production apparatus. 1. The production method of the reclaimed land according to 1. After the transfer of the slurry from the transferable slurry production apparatus to the landfill area within a transportable range is completed, the operation of the transferable slurry production apparatus is stopped, and the transferable slurry production apparatus is transferred to two or more While dividing into aggregates,
10. The production method for a reclaimed land according to claim 9 , wherein the transferable slurry manufacturing apparatus is transferred to a new installation site. 2. The method of producing a reclaimed land according to claim 1, wherein the produced slurry is put into the reclaimed area so that the slurry thickness is 20 to 40 cm. 10. The landfill development method of claim 9, wherein the mobile slurry production equipment includes a support base. The transferable slurry manufacturing apparatus has a maximum ground pressure of 0.5 kgf/cm ² 10. A landfill development production method according to claim 9, wherein:

Images