KR102741089B1 - Manufacturing Aggregate From Waste Bottle Glass - Google Patents

Abstract

A method for producing aggregate from bottle glass collected as waste is disclosed. The present invention provides a method for producing aggregate from waste glass, comprising: (a) a step of primarily crushing waste glass; (b) a step of primarily screening non-ferrous metals from the primarily crushed waste; (c) a first screening step of screening the non-ferrous metal-screened primarily crushed waste with a first screen of a first size to obtain particles passing through the screen as aggregate; (d) a step of secondary crushing the residue that does not pass through the first screen; (e) a second screening step of screening the secondarily crushed waste with a second screen of a second size larger than the first size; (f) a step of secondary non-ferrous metal screening from the crushed waste that passes through the second screen and obtain aggregate from the screened crushed waste; and (g) a step of repeating steps (d) to (f) at least once for the crushed waste that does not pass through the second screen.

Description

Method for manufacturing aggregate from waste bottle glass and device used therefor {Manufacturing Aggregate From Waste Bottle Glass}

The present invention relates to a method for recycling waste glass, and more specifically, to a method for producing high-quality aggregate from bottle glass collected as waste.

Bottle glass that was used to contain liquid beverages and is then discarded (hereinafter referred to as “waste glass”) is an excellent resource that can be recycled as a raw material for manufacturing bottle glass if it undergoes an appropriate crushing and foreign matter removal process to be made into particles of a specific size.

However, if it cannot be recycled as a raw material for manufacturing bottle glass, it must be landfilled, which inevitably causes environmental problems that incur social costs. In order for waste glass to be used as a raw material for manufacturing bottle glass, it must be classified by the color of the glass, and the mixing of metals, inorganic substances, and organic substances must be limited to the range allowable in the melting furnace for manufacturing bottle glass. However, the process of collecting used bottle glass for containing beverages inevitably involves all kinds of waste, and since the bottle glass itself is collected with metal or plastic bottle caps and paper labels attached, it is inevitable that waste glass that cannot be recycled as a raw material for manufacturing bottle glass is generated.

A known method of recycling heavily contaminated waste glass that cannot be distinguished by color is to crush the waste glass to a certain size and use it as a substitute for natural aggregate.

However, the process of crushing bottle glass to produce aggregate is not simply a crushing process, but must be accompanied by a process of removing all kinds of foreign substances. However, waste glass that is usually recycled as aggregate contains excessive foreign substances, and since these foreign substances cannot be completely removed, there is a problem that its use is limited to places where the aggregate is hardly exposed to the outside, such as bricks, and thus the problem is that the scope of recycling of waste glass is limited.

Furthermore, in the case of aggregates used for interior and exterior building materials such as terrazzo, if foreign substances in the aggregates are not removed, the commercial value of the interior and exterior materials will be lost, so complete removal of foreign substances is essential during aggregate manufacturing.

(1) JP 2007-197294 A

In order to achieve the above technical task, the present invention aims to provide a method for producing high-quality aggregates that can be exposed externally, such as aggregates for interior and exterior building materials, by removing foreign substances of various sizes from heavily contaminated waste glass.

In addition, the present invention aims to provide a high-quality aggregate manufacturing method capable of selectively removing fine non-ferrous metal material residues such as bottle cap ends.

In addition, the present invention proposes a method for efficiently removing materials such as plastic, metal, and ceramics by utilizing the differences in the properties and crushing characteristics of each material, thereby providing a method for manufacturing high-grade aggregates that can be exposed externally, such as aggregates for interior and exterior construction materials such as terrazzo, rather than existing low-grade aggregates.

In order to achieve the above technical problem, the present invention provides a method for manufacturing aggregate from waste glass, comprising: (a) a step of primarily crushing waste glass; (b) a step of primarily screening non-ferrous metals from the primarily crushed waste; (c) a first screening step of screening the non-ferrous metal-screened primarily crushed waste with a first screen of a first size to obtain aggregates from particles passing through the screen; (d) a step of secondary crushing the residue that does not pass through the first screen; (e) a second screening step of screening the secondarily crushed waste with a second screen of a second size larger than the first size; (f) a step of secondary non-ferrous metal screening from the crushed waste that passes through the second screen and obtain aggregates from the screened crushed waste; and (g) a step of repeating steps (d) to (f) at least once for the crushed waste that does not pass through the second screen.

In the present invention, it is preferable that the first screen of the first screen step has an aperture size of 3.0 to 3.8 mm, and the second screen has an aperture size of 3.5 to 6.0 mm.

In the present invention, a first magnetic selection step may be further performed between steps (a) and (b).

Additionally, a first intake step may be performed between steps (d) and (e).

Additionally, a second suction step may be performed on the crushed material that has not passed through the second screen after step (e).

Additionally, a second magnetic separation step may be performed on the crushed material that has not passed through the second screen after step (e).

In the present invention, after step (e), a third magnetic separation step can be performed on the crushed material that has passed through the second screen.

Additionally, a wind selection step may be performed on the crushed material that has passed through the second screen after the step (e).

According to the present invention, foreign substances of various sizes can be removed from heavily contaminated waste glass to produce high-quality aggregates that can be exposed externally, such as aggregates for interior and exterior building materials.

In addition, according to the present invention, selective removal of fine non-ferrous metal material residues such as bottle cap ends is also possible.

In addition, according to the present invention, a method for efficiently removing plastic, metal, ceramics, etc. by utilizing the differences in the properties and crushing characteristics of each material itself is presented, thereby making it possible to manufacture high-grade aggregate for interior and exterior building materials such as terrazzo.

Figure 1 is a photograph taken as an example of waste glass waste.
Figure 2 is a flow chart schematically illustrating an example of an aggregate manufacturing process of the present invention.
Figures 3a and 3b are photographs of shredded material during a processing process according to an embodiment of the present invention.
Figure 4 is a photograph of a shredded material after completion of a processing process according to an embodiment of the present invention.

The present invention will be described in detail by explaining a preferred embodiment of the present invention with reference to the drawings below.

Figure 1 is a photograph taken as an example of waste glass waste.

Referring to Figure 1, waste glass is composed of waste of various materials such as broken or whole bottle glass, glass powder, bottle caps, paper, and plastic.

In Fig. 1, bottle glass can be a raw material for high-quality aggregate in the present invention, but for this purpose, removal of other foreign substances is essential.

Figure 2 is a flow chart schematically illustrating an example of an aggregate manufacturing process of the present invention.

Referring to Fig. 2, waste glass is first crushed (S100). The first crushing can be performed by a conventional crushing technique. For example, a crusher such as a hammer mill or a vertical impact crusher can be used for the crushing. In the present invention, the particle size of the crushed material can be appropriately controlled in the crushing step.

Next, the crushed material is subjected to magnetic sorting (S102). In the magnetic sorting, iron-containing foreign substances such as iron bottle caps in the crushed material can be removed. Iron can be easily removed by a magnet, and a plate-shaped magnet or a magnetic belt can be used. If the bottle cap is fixed to the bottle in the crushed material, it can be removed by a magnet after crushing, but iron bottle caps collected separately from the bottle can be easily removed before crushing the bottle glass, so magnets can be installed both before and after the crushing process.

Next, the shredded material is sorted into non-ferrous materials to remove bottle caps made of non-ferrous metals such as aluminum or aluminum alloys in the shredded material (S104). For example, in the non-ferrous sorting step, a non-ferrous sorter using an electric eddy current can be used as the non-ferrous sorter. The eddy current non-ferrous sorter operates by bouncing aluminum foreign substances among the shredded material flowing onto the conveyor belt out of the conveyor belt by the electromagnetic force of a high-speed rotating magnetic rotor. To this end, the non-ferrous sorter is equipped with a permanent magnet built into the drum, and by rotating the permanent magnet (rotor) at high speed, an eddy current is generated on the surface of the drum to apply a repulsive force to non-ferrous metals such as aluminum flowing onto the conveyor belt and bouncing them out to sort them. At this time, the effective width of the non-ferrous sorter is preferably 900 to 1000 mm, and a conventional non-ferrous sorter with a magnetic force of 2800 to 3000 Gauss can be used.

At this time, the glass particles in the conveyor belt flow as they are along the conveyor belt. Meanwhile, if the shape of the aluminum bottle cap is completely preserved, it is easily removed by the physical force applied to the aluminum bottle cap by the electric eddy current, but if only the butt of the bottle cap remains, it is buried in the glass particles and is difficult to be bounced off by the physical force applied by the eddy current. Therefore, despite the non-ferrous metal sorting in this step, the butt separated from the bottle cap remains inside the glass particles. Meanwhile, in the present invention, the design and installation location of the electric eddy current non-ferrous metal sorter can be determined in consideration of the shape of the bottle cap to be removed. The order of the magnetic sorting step and the non-ferrous metal sorting step described above in the present invention can be appropriately designed. In addition, the magnetic sorting step in the present invention can be selectively performed, and the number of magnetic sorting operations can also be appropriately designed.

Next, the crushed material that has undergone magnetic separation and/or non-ferrous separation is screened (S106).

The first screening step of the present invention selects coarse glass particles and plastic bottle caps from the crushed material. Plastic bottle caps can be removed by taking advantage of the fact that they are different from brittle materials such as bottle glass in their crushing characteristics. While bottle glass is broken into small-sized particles by the impact of the crusher hammer, plastic does not break by the impact and maintains its size, so it can be separated from bottle glass particles through screening after the crusher.

The above first screening step is designed so that only fine glass particles crushed among the crushed materials pass through the screen. To this end, the aperture size (D1) of the screen in the first screening step of the present invention is preferably 3.0 mm or more, 3.1 mm or more, 3.2 mm or more, 3.3 mm or more, 3.4 mm or more, or 3.5 mm or more. In addition, the aperture size (D1) of the mesh is preferably 3.8 mm or less, 3.7 mm or less, or 3.6 mm or less. From the viewpoint of the recovery rate of glass, it is preferable that the upper limit of the mesh size be 3.8 mm or more. However, since aluminum tails that are not completely removed in the first non-ferrous metal sorter may be mixed into the product, it is preferable that the upper limit of the mesh size be 3.8 mm or less.

Meanwhile, in the present invention, the crushed material passing through the primary screen is a high-quality aggregate composed of fine glass particles and can be primarily collected.

The shredded material remaining in the above first screen goes through a suction process (S108). The suction process is a process of selecting shredded material having a specific gravity smaller than glass particles by negative pressure formed by a suction blower or the like. For example, plastic bottle caps and the like can be removed in this process.

Next, the shredded material undergoes a secondary crushing step (S110). In the secondary crushing step, a crusher such as a hammer mill or a vertical impact crusher may be used, just like in the primary crushing step. In the present invention, the particle size of the shredded material can be appropriately controlled in the secondary crushing step.

Next, the secondary crushed material is subjected to secondary screening (S112). In the secondary screen step of the present invention, the screen aperture size (D2) is larger than the screen aperture size of the primary screen step. In this step, the screen aperture size is determined so that non-ferrous metal foreign substances separated from the bottle cap, such as bottle cap tails or fragments, pass through the screen. For example, the aperture size (D2) of the secondary screen step is preferably 3.5 mm or more, 3.6 mm or more, 3.7 mm or more, or 3.8 mm or more, or 3.9 mm or more. In addition, the aperture size (D2) is preferably 6.0 mm or less, 5.5 mm or less, 5.0 mm or less, 4.5 mm or less, 4.2 mm or less, or 4.0 mm or less.

Next, the shredded material that has passed through the secondary screen goes through the secondary non-ferrous sorting step (S118). Since the buttocks separated from the bottle caps are difficult to bounce off even when subjected to electromagnetic force because they are buried in glass particles, it is preferable to make the rotor of the secondary non-ferrous sorter longer than that of the primary non-ferrous sorter to widen the effective width through which the shredded material is supplied to the non-ferrous sorter. In addition, it is preferable to increase the magnetic force of the rotor magnet of the secondary non-ferrous sorter. It is preferable that the effective width of the non-ferrous sorter be 1,100 mm or more, more preferably 1,200 mm or more, and the magnetic force be 4,000 gauss or more.

Subsequently, an additional magnetic separation step (S120) and/or wind separation step (S122) may be performed on the shredded material.

In the above magnetic separation step (S120), the wear iron of the crusher remaining in the crushed material can be removed.

The paper label attached to the bottle can be removed by utilizing the characteristic that it does not have its own shape when the bottle glass is crushed and scatters or clumps like dust when crushed. For this purpose, a wind sorter can be used in the wind sorting step (S122). Just as the slight difference in specific gravity between grains and bran is utilized when refining grains, the difference in specific gravity between the glass powder and the crushed paper label can be utilized to remove it.

Meanwhile, a second suction step may be performed on the crushed material that has not passed through the second screen (S114). The second suction step may be performed in the same manner as the first suction step described above. In the second suction step, plastic bottle cap fragments may be removed. In addition, a magnetic separation step (S116) may be performed on the crushed material that has not passed through the second screen. In the magnetic separation step, iron cap fragments may be removed. Of course, in the present invention, the order of the suction step (S114) and the magnetic separation step (S116) may be changed. In addition, in the present invention, either the suction step or the magnetic separation step may be omitted.

The shredded material that has gone through the suction step and/or the magnetic separation step is fed back into the shredder, and steps 112 to 122 can be repeated.

<Example>

An aggregate was manufactured from contaminated waste glass by performing a process according to one embodiment of the present invention described with reference to FIG. 2. Each process was performed as follows, and the movement of waste between each process was performed using a conveyor belt.

First, the collected highly contaminated waste glass, such as that in Fig. 1, was crushed in a hammer mill crusher and subjected to a first magnetic separation in a magnetic separator. Next, aluminum bottle caps were removed in a non-ferrous metal separator of Sungsung Industry Co., Ltd. and then screened with a first screen having a mesh size of 3.5 mm.

The crushed material passing through the screen was collected as aggregate. Fig. 3a is a photograph of the aggregate collected from the first screen in this example, and Fig. 3b is a photograph of the crushed material passing through the first screen.

Plastic bottle caps were removed from the shredded material that did not pass through the screen using a vacuum cleaner.

The shredded material from which the plastic bottle caps were removed was crushed a second time in a vertical impact crusher and screened with a second screen. At this time, the mesh size of the second screen was set to 4.0 mm.

Meanwhile, a secondary suction process was performed on the secondary crushed material that did not pass through the screen using a suction device, and secondary magnetic separation was performed to remove iron cap fragments. The magnetically separated crushed material was then circulated back to the secondary crushing process.

Meanwhile, the secondary crushed material that passed through the secondary screen was subjected to secondary non-ferrous sorting by a non-ferrous sorter of Sungsung Industry Co., Ltd. with a width of 1,200 mm, and then subjected to a tertiary magnetic sorting by the sorter to remove the wear iron from the crusher.

Fig. 4 is a photograph of an aggregate sample that has undergone a third magnetic separation in this embodiment. It can be seen from Figs. 3a and 4 that high-quality aggregate is obtained by the process of the present invention.

Claims (8)

(a) a step of first crushing waste glass including bottle glass;
(b) a step of selecting primary non-ferrous metals from the primary crushed material;
(c) a first screen step of screening the non-ferrous metal-sorted primary crushed material using a first size first screen to obtain particles passing through the screen as aggregate;
(d) a step of secondary crushing of the residue that does not pass through the first screen;
(e) a second screening step of screening the second crushed material using a second screen having a second size larger than the first size;
(f) a step of selecting non-ferrous metals from the crushed material that has passed through the second screen and obtaining aggregate from the selected crushed material; and
(g) a step of repeating steps (d) to (f) at least once for the shredded material that has not passed through the second screen;
The first screen of the above first screen step has an aperture size of 3.0 to 3.8 mm,
After the above step (e), a second suction step is performed on the crushed material that has not passed through the second screen.
Method for producing aggregate from waste glass. In the first paragraph,
A method for producing aggregate from waste glass, characterized in that the above secondary screen has a mesh size of 3.5 to 6.0 mm. In the first paragraph,
A method for producing aggregate from waste glass, characterized in that a first magnetic separation step is performed between the above steps (a) and (b). In the first paragraph,
A method for producing aggregate from waste glass, characterized in that a first suction step is performed between steps (d) and (e). delete In the first paragraph,
A method for producing aggregate from waste glass, characterized in that a second magnetic separation step is performed on the crushed material that has not passed through the second screen after the above step (e). In the first paragraph,
A method for producing aggregate from waste glass, characterized in that a third magnetic separation step is performed on the crushed material passing through the second screen after the above step (e). In the first paragraph,
A method for producing aggregate from waste glass, characterized in that a wind sorting step is performed on the crushed material passing through the second screen after the above step (e).