WO2013032288A1

WO2013032288A1 - Method for manufacturing a sound absorbing panel including artificial lightweight aggregate manufactured using coal ash of a power generating system

Info

Publication number: WO2013032288A1
Application number: PCT/KR2012/007012
Authority: WO
Inventors: 심구식; 김순재
Original assignee: 한국전력공사
Priority date: 2011-09-01
Filing date: 2012-08-31
Publication date: 2013-03-07
Also published as: DE112012003658B4; KR101137260B1; CN103857641A; CN103857641B; DE112012003658T5

Abstract

Disclosed is a method for manufacturing a sound absorbing panel. According to one embodiment of the present invention, the method for manufacturing a sound absorbing panel comprises: a first step of mixing, with respect to total weight, 15 to 48 weight % of dredged soil, 2.5 to 32.5 weight % of bottom ash, and 37.5 to 67.5 weight % of rejected ash so as to produce an artificial lightweight aggregate; and a second step of mixing the artificial lightweight aggregate with cement, admixtures, plasticizers, and water, injecting the mixture into a mold, curing the mixture, and then separating the mixture from the mold to produce a sound absorbing panel.

Description

Sound absorbing panel manufacturing method including artificial lightweight aggregate manufactured by using coal ash for power generation

The present invention relates to a sound absorbing panel manufacturing method, and more particularly to a sound absorbing panel manufacturing method comprising an artificial light weight aggregate manufactured using coal ash for power generation.

In general, ash for power generation is defined as residues remaining after incineration or combustion in a thermal power plant. Coal ash for power generation is a recyclable material in that it is a residue of a combustion product. However, since it is a combustion process, it is difficult to apply it technically since it contains incidental unburnt carbon.

Coal ash for power generation is classified into fly ash and bottom ash according to the generation place. About 80% of the coal ash for power generation is fly ash, and the rest is low ash.

Among them, fly ash, which is relatively high in quality, is recycled and used in various fields such as concrete admixtures, landfills, land improvement materials, and lightweight aggregates, accounting for about 90% of the total recycling rate.

However, in most cases of low ash and low quality rejected ash containing heavy metals, they are simply landfilled at the company site near the power plant, which makes it difficult to secure ashed paper and environmental pollution. There is a demand for a method that can utilize such low-end meetings and remnants.

In this regard, Korean Patent No. 10-0676379 (Patent Document 1) discloses a method for manufacturing a sound absorbing soundproof panel using low-weight lightweight aggregate.

However, in Patent Document 1, there is a problem that does not include the method of utilizing the residual ash because it does not include the residual material in the manufacture of lightweight aggregate, and in particular, since only the low particle size of 1.25 to 5 mm is used, There was a problem in that the method of using the low level that does not fall within the granularity range was not disclosed.

Embodiments of the present invention are to provide a method for manufacturing a flaw panel using artificial lightweight aggregate manufactured by using low ash and residual material.

It is intended to provide a sound absorbing panel with improved sound absorbing power by mixing dredged soil, low ash and residue in an appropriate ratio.

According to one aspect of the invention, the agent for producing artificial lightweight aggregate by mixing 15 to 48% by weight of dredged soil, 2.5 to 32.5% by weight bottom ash and 37.5 to 67.5% by weight of rejected ash relative to the total weight Stage 1; And a second step of mixing cement, admixture, fluidizing agent, and water in the artificial lightweight aggregate, injecting and curing the mold, and separating the mold from the mold to manufacture a sound absorbing panel. .

At this time, the first step, step 1-1 to prepare a mixture by mixing the dredged soil, low ash and residue; A first step of extruding the mixture, a first step of forming a molded body by cutting a second shape in a round shape by cutting to fit the particle size distribution of the light aggregate; 1-3 to dry the molded body to produce a dried body; And 1-4 steps of firing the dried body at 1050 to 1200 ° C.

In addition, the first step may be a step of manufacturing artificial lightweight aggregate by mixing 30% by weight of the dredged soil, 17.5% by weight of low ash and 52.5% by weight of the residue.

On the other hand, the second step, 2-1 to prepare a first mixture by mixing cement, water and silica fume; Step 2-2 of preparing the second mixture by mixing the artificial light weight aggregate with the first mixture; 2-3 to prepare a third mixture by mixing admixtures and / or fluidizing agents with the second mixture; And injecting the third mixture into the mold in which the pleats are formed.

In addition, the second step is a step of mixing 25 to 27 parts by weight of cement, 3 to 4 parts by weight of admixture, 1 to 2 parts by weight of fluidizing agent and 7 to 8 parts by weight of water, based on 100 parts by weight of the artificial lightweight aggregate Can be.

According to another aspect of the present invention, the artificial light aggregate, cement, admixture and fluidizing agent, the artificial light aggregate is 15 to 48% by weight of dredged soil, 2.5 to 32.5% by weight bottom ash and rejected ash A sound absorbing panel may be provided that comprises 37.5 to 67.5% by weight.

In addition, it may further include a non-asbestos extruded cement plate coupled to the lower portion of the sound absorbing panel.

In addition, the non-asbestos extrusion molded cement plate may further include a frame in which a plurality of sound absorbing panels are combined and stacked.

Embodiments of the present invention can maximize the recycling of coal ash for power generation by producing artificial lightweight aggregate and sound absorbing panel utilizing both low ash and remnants conventionally simply landfilled.

In addition, by mixing the dredged soil, low ash, and residue in an appropriate ratio to produce an artificial lightweight aggregate, it is possible to improve the sound absorption of the lightweight aggregate sound absorbing panel.

1 is a flow chart of a sound absorbing panel manufacturing method according to an embodiment of the present invention.

Figure 2 is a flow chart that subdivided the artificial lightweight aggregate production in the sound absorbing panel manufacturing method of FIG.

FIG. 3 is a flowchart illustrating subdivided sound absorbing panel manufacturing in the sound absorbing panel manufacturing method of FIG. 1.

4 is a perspective view of a sound absorbing panel manufactured by the method of FIG. 1.

5 is a utilization of the sound absorbing panel of FIG.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Shape and size of the elements in the drawings may be exaggerated for more clear description.

1 is a flow chart of a sound absorbing panel manufacturing method according to an embodiment of the present invention. Referring to Figure 1, the sound absorbing panel manufacturing method according to an embodiment of the present invention is 15 to 48% by weight of dredged soil, 2.5 to 32.5% by weight bottom ash (rejected ash) 37.5 to 67.5 with respect to the total weight A first step (S110) of manufacturing artificial lightweight aggregate by mixing the weight%; And a second step (S120) of mixing the cement, admixture, fluidizing agent, and water into the artificial lightweight aggregate, injecting and curing the mold, and separating the mold from the mold to produce a sound absorbing panel.

Hereinafter, each step of the sound absorbing panel manufacturing method will be described.

FIG. 2 is a flow chart of subdividing artificial lightweight aggregate manufacturing (S110) in the sound absorbing panel manufacturing method of FIG. 1.

2, first, the mixture is prepared by mixing dredged soil, low ash and residue. The dredged soil may be 15 to 48% by weight as pumped out of the sand, soil, sand, etc. deposited on the bottom of the river, lake, sea. The low ash may include 2.5 to 32.5 wt% of the solidified material by falling down the boiler in a state in which particles are formed by sintering in a combustion furnace. In addition, the low ash may be mixed in a round form through a separate process. On the other hand, the residue may include 37.5 to 67.5% by weight of the low-quality coal-fired power circuit generated in the process of making the fly ash (S111).

Next, the mixture is first molded by extrusion molding, cut to fit the particle size distribution of the lightweight aggregate, and secondly molded into a round shape to produce a molded body. Since the extrusion method or the round molding method can use a conventional method, the description thereof will be omitted (above S112).

Next, the molded body is dried to prepare a dried body. As a drying method, it is possible to use a rotary dryer (ROTARY DRYER) (above S113).

Next, the dried body is fired at 1050 to 1200 ° C. The baking method can use a conventional method, and baking time is not limited. For example, it is possible to put the dry body into a baking machine and to bake for about 30 minutes (above S114).

Artificial lightweight aggregate produced through the above-described process may be used as a sound absorbing material of the sound absorbing panel to be described later.

FIG. 3 is a flow chart of subdividing the sound absorbing panel manufacturing (S120) in the sound absorbing panel manufacturing method of FIG. 1.

Referring to FIG. 3, first, cement, water, and silica fume are mixed to prepare a first mixture, and the artificial light aggregate is mixed with the first mixture to prepare a second mixture.

The mixing amount is based on 100 parts by weight of the artificial lightweight aggregate, the cement is 25 to 27 parts by weight, the water is mixed 7 to 8 parts by weight, the silica

Fume is a mixed material for concrete, and a small amount of the mixed amount is not specified (S121 and S122).

Next, a third mixture is prepared by mixing a admixture and / or a fluidizing agent with the second mixture. The admixture and the fluidizing agent may be conventionally used as a reducing agent, accelerator, retardant, foaming agent, etc. for imparting a particular quality to mortar, concrete, and the like.

On the other hand, the mixing amount of the admixture and the fluidizing agent is based on 100 parts by weight of the artificial lightweight aggregate, the admixture is mixed 3 to 4 parts by weight, the fluidizing agent is mixed 1 to 2 parts by weight (above S123).

Next, a sound absorbing panel may be manufactured by injecting the third mixture into a mold having a wrinkle portion, and curing the mixture injected into the mold and then separating the mold from the mold again.

Hereinafter, it includes artificial lightweight aggregate, cement, admixture and fluidizing agent, the artificial lightweight aggregate is 15 to 48% by weight of dredged soil, 2.5 to 32.5% by weight bottom ash and 37.5 to 67.5% by weight of rejected ash It will be described with respect to the sound absorbing panel comprising a. The sound absorbing panel is not particularly limited, but may be manufactured through the above method.

4 is a perspective view of the sound absorbing panel 100 manufactured by the method of FIG. 1. Referring to Figure 4, the sound absorbing panel 100 has a corrugation (corrugation) shape on the top and the non-asbestos extruded cement plate coupled to the sound absorbing panel 110 and the sound absorbing panel 110 is made of the artificial light weight aggregate ( 120).

In the present specification, the sound absorbing panel 100 made of the artificial lightweight aggregate is the same as the sound absorbing panel 110, but for convenience of description, the sound absorbing panel 110 and the combination of the non-asbestos extruded cement plate 120 will be absorbed below. It is defined as the panel 100.

On the other hand, asbestos-free extruded cement plate 120 is to improve sound insulation and to prevent damage to the sound absorbing panel 110, a foam concrete made by curing at high temperature and high pressure as a raw material of silica sand and lime, It is available.

As such asbestos-free extruded cement plate 120, ALC (autoclaved lightweight)

concrete plates, and extruded cement panels (ECP).

As a method of bonding the sound absorbing panel 110 and the non-asbestos extruded cement plate 120, an adhesive may be used, or a metal fitting fastening method or a bending fastening method may be used.

5 is a utilization of the sound absorbing panel 100 of FIG. Referring to FIG. 5, the sound absorbing panel 100 may further include a frame 130 in which a plurality of sound absorbing panels 100 are stacked and accommodated. The frame 130 may be an I-beam or an H-beam, and as illustrated in FIG. 5, a plurality of sound absorbing panels 100 may be sandwiched and stacked between two I-beams.

When the sound absorbing panel 100 is constructed using the frame 130 as described above, since the sound absorbing panel 100 moves independently of each other, the sound absorbing panel 100 may have a strong durability against natural disasters, and has an advantage of easy maintenance.

As described above, the embodiments of the present invention can maximize the recyclability of coal ash for power generation by producing artificial lightweight aggregate and sound absorbing panel utilizing both low ash and remnant that were conventionally disposed of simply discarded, dredged soil, low ash, By mixing the residue in an appropriate ratio to produce an artificial lightweight aggregate, the sound absorbing power of the light weight aggregate sound absorbing panel can be improved.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the scope of the present invention is not limited by the following examples.

EXAMPLE

(1) Preparation of artificial lightweight aggregate with different mixing ratio

[Table 1] summarizes by measuring the mixing ratio, dry weight and absorption rate of artificial lightweight aggregate prepared by mixing the dredged soil, low ash and residues in various ratios. On the other hand, the artificial lightweight aggregate production was performed at a firing temperature in the range of 1050 ℃ to 1200 ℃.

Table 1

	Dredged soil (wt%)	Low ash (wt%)	Residual (wt%)	Weight ratio	Absorption rate (%)
Experimental Example 1	30	17.5	52.5	0.6 to 1.4	12-22
Experimental Example 2	27	20.5	52.5	0.65 ~ 1.41	14.3 ~ 23
Experimental Example 3	24	23.5	52.5	0.69 ~ 1.43	11-24.7
Experimental Example 4	21	26.5	52.5	0.8-1.5	14.5 ~ 25.6
Experimental Example 5	18	29.5	52.5	0.95-1.48	17.3-26.1
Experimental Example 6	15	32.5	52.5	1.12-1.50	15.5-26.4
Experimental Example 7	12	35.5	52.5	1.38-1.78	17.8-26.5
Experimental Example 8	33	14.5	52.5	0.68-1.45	13.7 ~ 24.5
Experimental Example 9	36	11.5	52.5	0.89-1.44	14.2 ~ 28.6
Experimental Example 10	39	8.5	52.5	0.95-1.49	14.5 ~ 27.8
Experimental Example 11	42	5.5	52.5	0.99-1.50	15.3-27.7
Experimental Example 12	45	2.5	52.5	1.23-1.50	16.2 to 28.7
Experimental Example 13	48.5	-	52.5	1.23-1.88	17-29
Experimental Example 14	27	17.5	55.5	0.67-1.45	13.7 ~ 25.1
Experimental Example 15	24	17.5	58.5	0.79-1.48	14.3 ~ 26.7
Experimental Example 16	21	17.5	61.5	0.83-1.49	15.2 ~ 27.3
Experimental Example 17	18	17.5	64.5	0.95-1.50	16.8 ~ 27.9
Experimental Example 18	15	17.5	67.5	1.15-1.50	16.4 ~ 27.8
Experimental Example 19	12	17.5	70.5	1.3 to 1.85	17.2 ~ 27.2
Experimental Example 20	33	17.5	49.5	0.77 ~ 1.43	12.7 ~ 24.5
Experimental Example 21	36	17.5	46.5	0.85-1.49	13.4 ~ 25.5
Experimental Example 22	39	17.5	43.5	0.95-1.48	13.7 ~ 26.8
Experimental Example 23	42	17.5	40.5	1.13-1.49	14.3-28.7
Experimental Example 24	45	17.5	37.5	1.2-1.50	15.3 ~ 27.8
Experimental Example 25	48	17.5	34.5	1.39-1.82	16.3-28.9

In Table 1, Experimental Examples 1 to 12 are artificial light weight aggregates prepared by variously configuring a dredged soil and a low ash mixture ratio after fixing the residue to 52.5wt%, and Experimental Example 13 was prepared without low ash. It is artificial lightweight aggregate, Experimental Example 14 to Experimental Example 25 is an artificial lightweight aggregate prepared by fixing the low ash to 17.5wt%, and then variously constituted the mixing ratio of dredged soil and residue.

The dry weight ratio of the artificial light weight aggregate that can be used as the sound absorbing panel is 1.5 or less, and the artificial light weight aggregate corresponding to Experimental Example 7, Experimental Example 13, Experimental Example 19 and Experimental Example 25 in Table 1 meets the criteria for the dry weight ratio. It can be confirmed that there is a case that can not be. Therefore, the mixing ratio of dredged soil, low ash and residue in one embodiment of the present invention is 15 to 48% by weight of dredged soil, 2.5 to 32.5% by weight and 37.5 to residue, except for Experimental Examples 7, 13, 19 and 25. It is in the 67.5 weight% range.

On the other hand, the absorption rate of the artificial lightweight aggregate that can be used as the sound absorbing panel is 30% or less, it can be seen that all the experimental examples in the above [Table 1] satisfies the absorption rate criteria.

In addition, when considering both dry weight and water absorption, artificial lightweight aggregate (Experimental Example 1) prepared by mixing 30% by weight of dredged soil, 17.5% by weight of ash, and 52.5% by weight of residue was found to be most suitable.

(2) Chemical Composition of Artificial Lightweight Aggregate

In Table 1, the chemical composition of the artificial light weight aggregate corresponding to Experimental Example 1 was measured. The measurement results are shown in the following [Table 2].

TABLE 2

	SiO ₂	Al ₂ O ₃	Fe ₂ O ₃	CaO	MgO	Na ₂ O	K ₂ O	TiO ₂	P ₂ O ₅	IgLoss	Other
Artificial lightweight aggregate	59.3	22.5	9.8	0.9	1.7	0.9	3.2	1.2	0.2	0.17	0.13

(3) Sound absorption test of sound absorbing panel

Sound absorption using artificial light weight aggregate corresponding to Experiment 1 in Table 1 above

Panels were prepared. More specifically, the sound absorbing panel was manufactured by mixing 836 kg of the artificial lightweight aggregate, 217 kg of cement, 1050 ° C. of a admixture (powder), 10 kg of a fluidizing agent (liquid), and 66.7 kg of water.

Next, the test was carried out in the reverberation chamber according to KS F 2805 (Method of absorption rate in the reverberation chamber), and the results are shown in the following [Table 3].

TABLE 3

Frequency (Hz)	Reverberation time (Sec)		Sound absorption coefficient (NRC)
Frequency (Hz)	Conventional Sound Absorption Panel	Sound absorption panel (Experimental Example 1)	Sound absorption coefficient (NRC)
100	31.3	26.4	0.73
125	29.3	22.5	0.74
160	19	17.4	0.77
200	17.6	15.3	0.78
250	13.1	11.9	0.72
315	12.2	11	0.74
400	10.2	8.9	0.73
500	9.7	7.4	0.73
630	8.9	6.3	0.78
800	7.6	5.2	0.76
1000	4.9	3.9	0.73
1250	4.8	3.1	0.70
1600	4.5	3.2	0.74
2000	4.2	3.7	0.73
2500	4.0	3.7	0.70
3150	3.9	3.6	0.71

As shown in Table 3, the sound absorbing panel according to an embodiment of the present invention (Experimental Example 1) shows a shorter reverberation time in all octave band frequency ranges as compared to the conventional sound absorbing panel, and the sound absorbing performance of the sound absorbing panel is It can be seen that the improvement. This is because the reverberation time becomes shorter as the sound absorption rate of the sound absorption panel mounted in the reverberation chamber increases.

In addition, in the industrial standards related to soundproof walls, the minimum criterion of sound absorption rate (sound absorption coefficient, NRC) is 0.7 or more, and the sound absorption panel according to the embodiment of the present invention (Experimental Example 1) has a sound absorption rate of 0.7 or more in all octave band frequency ranges. As it appears, it is considered to be a sound absorbing panel that is commercially available.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and changes can be made without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary skill in the field.

Claims

A first step of preparing artificial lightweight aggregate by mixing 15 to 48% by weight of dredged soil, 2.5 to 32.5% by weight of bottom ash, and 37.5 to 67.5% by weight of rejected ash, based on the total weight; And

A second step of preparing a sound absorbing panel by mixing cement, admixture, fluidizing agent, and water in the artificial lightweight aggregate, injecting and curing the mold, and then separating the mold from the mold;

Sound absorbing panel manufacturing method comprising a.
The method of claim 1,

The first step,

1-1 to prepare a mixture by mixing the dredged soil, low ash and residue;

A first step of extruding the mixture, a first step of forming a molded body by cutting a second shape in a round shape by cutting to fit the particle size distribution of the light aggregate;

1-3 to dry the molded body to produce a dried body; And

Sound absorbing panel manufacturing method comprising the step 1-4 of firing the dried body at 1050 to 1200 ℃.
The method of claim 1,

The first step,

Sound absorbing panel manufacturing method comprising the step of manufacturing artificial lightweight aggregate by mixing 30% by weight of the dredged soil, 17.5% by weight of low ash and 52.5% by weight of the residue.
The method of claim 1,

The second step,

Step 2-1 to prepare a first mixture by mixing cement, water and silica fume;

Step 2-2 of preparing the second mixture by mixing the artificial light weight aggregate with the first mixture;

2-3 to prepare a third mixture by mixing admixtures and / or fluidizing agents with the second mixture; And

Sound absorbing panel manufacturing method comprising the step of injecting the third mixture into the mold formed wrinkles.
The method of claim 1,

The second step,

Sound absorbing panel manufacturing method of mixing 25 to 27 parts by weight of cement, 3 to 4 parts by weight of admixture, 1 to 2 parts by weight of fluidizing agent and 7 to 8 parts by weight of water based on 100 parts by weight of the artificial lightweight aggregate.
Artificial light aggregate, cement, admixture and fluidizing agent, the artificial light aggregate comprising 15 to 48% by weight of dredged soil, 2.5 to 32.5% by weight of bottom ash and 37.5 to 67.5% by weight of rejected ash Sound absorbing panel, characterized in that.
The sound absorbing panel according to claim 6, further comprising a non-asbestos extruded cement plate bonded to the bottom of the sound absorbing panel.
The sound absorbing panel according to claim 7, further comprising a frame in which a plurality of sound absorbing panels to which the asbestos-free extruded cement plate is bonded are stacked and accommodated.