JP2006000789A - Separation method of construction mixed waste, and facility therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a separation method of construction mixed waste and facility therefor enhancing separation efficiency of regenerated sand with an ignition loss of 5% or less, in construction mixed waste separation. <P>SOLUTION: This facility is provided with a small article/earth and sand separator 1 separating small articles and earth and sand less than 40 mm from separation residue of a rough separation process separating long and large articles from construction mixed waste; a manual separation line 2 for manual separation of articles causing trouble when entering recyclable articles or residue after manual separation; a crusher 4 crushing residue of the line 2; a small article/earth and sand separator 5 separating small article/earth and sand less than about 40 mm; an incombustible fine separator 6 separating fine particles less than 8 mm, small lumps of about 8-40 mm and lightweight combustibles from the small articles and earth and sand separated in the separator 5; a crusher 7 crushing the separated small lumps into about 8mm or less; and a sand producing apparatus 8 having a sieve and blowing/sucking device, separating the regenerated sand with an ignition loss of 5% or less by removing combustibles, dust, gypsum and wood pieces in the fine particles. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and facility for sorting construction mixed waste, which highly classifies non-combustible waste in the hand sorted residue of roughly sorted construction mixed waste into a product that can be recycled efficiently and continuously.

  Construction mixed waste mixed with various types and sizes of combustible materials such as wood, paper scrap, waste plastic, etc., non-combustible materials such as plaster, concrete glass, glass, etc. Occurs. From this construction mixed waste, combustible materials, non-combustible materials, recyclable materials, etc. are selected.

  FIG. 2 is a general processing flow of conventional construction mixed waste. In FIG. 2, the construction mixed waste generated at the construction site is carried into a sorting facility and sorted in a rough sorting process and a finishing sorting process. The finishing sorting process includes a machine sorting process, a hand sorting process, a crushing process, and a non-combustible material sorting process.

  FIG. 3 is a diagram showing an example of a conventional sorting facility. In FIG. 3, in the rough sorting process, the construction mixed waste at the construction site is a large recyclable material from the construction mixed waste loaded and transported to the vehicle. Sort out. The size to be selected is 300 to 500 mm or more, and is usually waste concrete, large pieces (rolled vinyl sheet, etc.), waste wood, waste wood, scrap metal, ceramic waste, metal scrap (iron scrap, aluminum, electric wire, etc.) Combustible materials (carpets, tatami mats), cardboard, gypsum board, interior panels, PVC pipes, difficult-to-process materials (desks, chairs, rocks, etc.).

  In FIG. 3, the sorting residue in the coarse sorting process is sorted into earth and sand less than about 30 mm, medium-sized articles and combustibles of less than about 30 mm by a machine sorting process such as a vibration sieve combined with wind power and a trommel wind sorter 1. . Medium articles of about 30 mm or more are transported to the next hand sorting line 2.

  In hand sorting line 2, in combustible materials, PVC, gypsum, wood, large metals (aluminum, stainless steel, electric wires, etc.), difficult-to-process materials (spray cans, composites, etc.), etc. When entering, the items that interfere with the post-process are selected and temporarily stored in the yard or box below the line.

  Residues after manual sorting are mainly non-combustible materials such as concrete glass, ceramic waste, and glass waste, and are mixed with small pieces of combustible material that cannot be manually sorted, such as wood waste, paper, and vinyl chloride. These are crushed with an impact crusher 4. The crushing size is generally 30 to 40 mm or less.

  The crushed material of the hand sorting residue and the earth and sand separated in the machine sorting process merge and are conveyed to the incombustible material sorting machine 6. Incombustible material sorting machines are generally wind-powered vibration sorters, wind-powered trommels, etc., and are classified into light flammable materials, earth and sand of about 8 mm or less, and small items of about 8 to 30 mm by sieving and wind power.

Regarding the incombustible material selection process, Patent Document 1 discloses that after sorting heavy materials selected by a machine, it is classified into three types: fine particles, small lump, and combustible material using a non-combustible material selection machine that uses both wind and sieve. It is described.
JP 2001-794493 A

  However, among the conventional sorting processes, the incombustible material sorting process has the following problems. Fine particles of about 8mm or less contain less combustible materials and become sand products with a heat loss of 5% or less, and can be reused as roadbed materials, etc. Soft wood such as wood scrap and vinyl chloride is less crushed to about 8 mm or less and has a high specific gravity, so it is highly mixed in small chunks of about 8 to 30 mm. The current situation is that the amount of dredged material does not fall below 5%, but is disposed of as a controlled landfill.

  In particular, non-combustible residues that get wet with water on rainy days, etc., contain wood moisture, gypsum, etc., and have a high specific gravity. This also causes the sorting efficiency to deteriorate.

  In view of this, the present invention provides a non-combustible material for construction mixed waste that can be regenerated as a sand product having a thermal loss of 5% or less in the small-sized product of about 8 to 30 mm in the non-combustible material sorting step for construction mixed waste. The present invention provides a residue sorting method and its equipment.

  The method for sorting construction mixed waste according to the present invention extracts from the sorting residue of the coarse sorting process for sorting long-sized materials from construction mixed waste, the recyclable material or the one that interferes with the subsequent process when entering the sorted residue. A manual sorting process, a crushing process for crushing the residue of the manual sorting process into small articles of less than 40 mm, a sediment sorting process for sorting out sediments of less than 40 mm from the sorted residue of the coarse sorting process, and the crushing process / sediment sorting Small items of less than 40 mm and earth and sand crushed or sorted in the process are put into a wind and sieve combined type incombustible material sorting machine and sorted into sand products of about 8 mm or less, small chunks of about 8 to 40 mm and lightweight combustible materials. Incombustible material selection step, crushing step of crushing the small lump selected in the incombustible material selection step into fine particles of about 8 mm or less, and fine particles in the crushing step are provided with a sieve and a blower / suction device The sorting device removes combustibles and dust. And removed by characterized by comprising the manufacturing sand step of selecting a reclaimed sand.

  Moreover, the construction mixed waste sorting facility of the present invention may interfere with the post-process when entering the recyclable material or the sorted residue from the sorting residue of the coarse sorting process for sorting long-sized materials from the construction mixed waste. , A crusher that crushes the residue of the sorting line into small items of less than 40 mm, a sand sorter that sorts earth and sand of less than 40 mm from the sorted residue of the coarse sorting, and the crushing step / sediment sorter Incombustible material sorting machine that sorts small articles and soil that have been crushed or sorted into 8 to 40 mm from small ingots and lightweight combustibles, and fine granules of about 8 mm or less sorted by the incombustible material selector And a sorting device having a sieve and a blower / suction device for sorting the reclaimed sand by removing combustibles and dust from the fine particles of the crusher.

  The effects of the present invention are as follows.

(1) Conventional small incombustibles of approximately 8 to 40 mm after selective selection of incombustible materials have a high combustible material mixing rate and are difficult to recycle. It is possible to produce reclaimed sand with an apparently beautiful quality with a more uniform particle size distribution and less dust.

(2) Conventionally, when the incombustible material residue is wet with water due to rain or the like, the sorting efficiency of the incombustible material sorting machine is poor, and reproducible fine particles and small lumps have not been obtained. Regardless of the content, it is possible to obtain a certain incombustible material sorting accuracy.

(3) Further, by mixing a moisture adsorbent such as lime in the process between the crusher and the incombustible material selector, waste scraps, gypsum and the like are easily selected.

(4) By installing a wind power sorter between the manual sorting process and the crushing process, it is possible to reduce the mixing rate of combustible materials and wood chips mixed in the incombustible material residue that is put into the incombustible material sorting machine. This has the effect of reducing the heat loss of the recycled sand product.

  FIG. 1 is a diagram showing an example of equipment for a finishing selection process of the present invention. For example, the sorting residue of the coarse sorting process for sorting out large and large items from the construction mixed waste is put into, for example, a wind-powered trommel 1 to remove earth and sand of about 30 mm or less and sort into lightweight combustibles and small articles of about 30 mm or more. Small articles having a size of about 30 mm or more are sorted in the hand sorting line 2 so that they can interfere with the subsequent process when they enter the recyclable product or the residue after hand sorting.

  The wind-powered trommel 1 removes lightweight combustibles, mainly waste plastic, from the sorting residue in the rough sorting process. This wind-powered trommel 1 can be replaced by a combination of a trommel and a wind sorter, or a machine such as a wind-powered vibrating screen. This wind-powered trommel 1 removes bulky combustible materials such as vinyl sheets, and mechanically obtains high-quality combustible materials that can be used as RPF raw materials. Sorting efficiency can be improved.

  The wind sorting machine 3 is provided behind the hand sorting line 2, and the wind power sorting machine 3 in the latter stage is made stronger than the wind power combined use type trommel 1 in the former stage, so that the residue after the hand sorting is reduced to light weight such as wood chips and gypsum board. May be removed as much as possible to improve the quality of the final recycled product.

  Residue after hand sorting or after wind sorting except light weight is crushed to about 40 mm or less by impact type crusher 4. When crushing accuracy is poor, a trommel 5 or a vibrating screen may be provided at the subsequent stage of the crusher, and 40 mm or more may be returned to the crusher 4.

  The crushed material crushed by the impact-type crusher 4 and the earth and sand less than 30 mm selected by the wind-powered trommel 1 are put into the incombustible material sorting machine 6 which is a wind-powered vibration sieve.

  A non-combustible material sorting machine 6 selects heavy fine particles having a specific gravity of about 8 mm or less, small chunks of about 8 to 40 mm, and lightweight combustible materials. The selected small lump of about 8 to 40 mm is further pulverized by the impact type pulverizer 7 to make the small lump into a fine particle of about 8 mm or less. Due to the characteristics of this impact-type pulverizer, soft combustibles that are difficult to be crushed to about 8 mm or less can be removed by a sieve in a subsequent process, and light flammable materials of less than about 8 mm can be removed by wind sorting.

  The fine particles obtained by the pulverizer 7 are crushed by a sand making device 8 equipped with a sieve and a blower / suction device, such as lightweight combustible materials and dust, reclaimed sand of about 8 mm or less, gypsum and wood scrap of about 8 mm or more. They are separated into foreign substances and sent to the product yard 10 and the foreign substance yard 11. As the sand making apparatus 8 equipped with a sieve and a blower / suction apparatus, a known apparatus often used in a crushed stone plant or the like can be used. By the combined use of the suction of the sand making apparatus 8, the crushed dust is also removed, and a beautiful sand product with a small particle content and a uniform particle size distribution is obtained.

  In the process between the crusher 4 and the incombustible material selector 6, a water adsorbent mixing device 9 for mixing a water adsorbent such as lime can be installed. In the case of non-combustible residue with a lot of moisture, a moisture adsorbent adheres to the scraps, gypsum, etc., absorbs moisture, and is easily sorted to the combustible side. In addition, the dust adhering to the surface of the incombustible material can be removed by the moisture adsorbent together with the moisture on the surface, and a small lump with a beautiful appearance can be obtained. In addition, when lime is used as the moisture adsorbent, the incombustible material is dried by a hydration reaction, and the problem of clogging of the incombustible material selection machine is reduced. Therefore, particularly on rainy days, it is possible to sort incombustible residue with high moisture content without reducing the sorting efficiency.

  It can be used to sort construction mixed waste.

It is a figure which shows an example of the incombustible material selection equipment of this invention. It is a general processing flow of conventional construction mixed waste. It is a figure which shows an example of the conventional sorting equipment.

Explanation of symbols

1: Trommel combined with wind power 2: Manual sorting line 3: Wind sorting machine 4: Impact crusher 5: Trommel 6: Non-combustible material sorting machine 7: Crusher 8: Wind sorting machine 9: Moisture adsorbent mixing device 10: Product Yard 11: Foreign object yard

Claims (6)

A manual sorting process for extracting recyclables or sorted residues that would interfere with the post-process from the sorting residue of the coarse sorting process for sorting long-sized materials from construction mixed waste; and
A crushing step of crushing the residue of the manual sorting step into small items of less than 40 mm;
An earth and sand sorting step for sorting earth and sand less than 40 mm from the sorting residue of the coarse sorting step;
Small articles of less than 40 mm and earth and sand that have been crushed or sorted in the crushing process / sediment sorting process are put into an incombustible material sorting machine that uses both wind and sieve, and a sand product of about 8 mm or less and a small lump of about 8-40 mm A non-combustible material selection process to select lightweight combustible materials;
A crushing step of crushing the small lump selected in the incombustible material selection step into fine particles of about 8 mm or less;
In the construction mixed waste, characterized in that it comprises a sand making process for removing the combustible material and dust and sorting the reclaimed sand with a sorting device equipped with a sieve and a blower / suction device. Sorting method.   The wind power sorter is provided before and after the manual sorting step, and the wind power sorter for removing the wood chips, the gypsum board, and the like by strengthening the wind power of the rear wind sorter than the previous wind sorter. The construction mixed waste sorting method described.   3. The construction mixed waste sorting method according to claim 1 or 2, further comprising a step of mixing a moisture adsorbent such as lime between the pulverization step and the non-combustible material selection step. A manual sorting line that extracts recyclables or sorted items that would interfere with the post-process from the sort residue of the coarse sort process that sorts long-sized materials from construction mixed waste;
A crusher for crushing the residue of the hand sorting line into small items of less than 40 mm;
A soil sorting machine for sorting soils of less than 40 mm from the sorting residue of the rough sorting;
A non-combustible material sorting machine for sorting small articles and light combustibles of about 8 to 40 mm from small articles and earth and sand crushed or sorted by the crushing step / sediment sorter;
A pulverizer for making a small lump of about 8 mm or less from the small lump selected by the non-combustible material selector;
A construction mixed waste sorting facility, comprising: a combustible material for fine particles of the pulverizer, and a sorting device for removing the dust to sort out the reclaimed sand and having a sieve and a blowing / suction device.   A wind power sorter is provided before and after the manual sorting line, and the wind power sorter at the rear stage is a wind power sorter that removes wood chips, gypsum board, etc. by increasing the wind power than the wind power sorter at the previous stage. 4. Construction mixed waste sorting equipment according to 4.   6. The construction mixed waste sorting facility according to claim 4 or 5, further comprising a moisture adsorbent mixing device for mixing a moisture adsorbent such as lime between the pulverizer and the non-combustible material selector.

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