KR20100079822A - Artificial lightweight aggregate containing waste glass and hard clay and method for preparing the same - Google Patents

Abstract

PURPOSE: A method for manufacturing artificial lightweight aggregate is provided to remarkably improve recycling rate of waste glass and to manufacturing the artificial lightweight aggregate only using the waste glass and brown clay without using a separate foaming agent. CONSTITUTION: A method for manufacturing environment-friendly artificial lightweight aggregate using waste glass and brown clay comprises the following steps: manufacturing a crushed material by shattering the waste glass and the brown clay; manufacturing a molded material by molding the shattered material; and obtaining the artificial lightweight aggregate by sintering the molded material. The content of the brown clay is 25-67 parts by weight based on 100.0 parts by weight of the waste glass including dusts.

Description

Artificial Lightweight Aggregate Containing Waste Glass and Hard Clay and Method for Preparing the Same}

The present invention relates to a method for producing an environmentally friendly artificial light weight aggregate containing waste glass and red clay, and more particularly, by uncovering the foaming mechanism of waste glass and significantly improving the recycling rate of waste glass without using a separate blowing agent. Without worry, to an environment-friendly artificial light weight aggregate using only waste glass and red clay, and to a method of manufacturing the same.

Artificial lightweight aggregate refers to artificial aggregate used to lighten the weight of concrete, and is generally made by baking shale clay. At this time, the principle mainly used to lighten the weight is foaming, the weight is made due to the pores generated by the foaming.

In the weight reduction by foaming, the foaming mechanism is the generation of foaming gas and the formation of the surface to trap the generated gas, and the kinds of foaming gas are as follows.

H ₂ O (l) → H ₂ O (g) ------------------------------------- ------ (One)

CmHn + (m + n / 4) O ₂ → mCO ₂ (g) + n / 2H ₂ O (g) ---------------------- (2 )

CaCO ₃ → CaO + CO ₂ (g) ------------------------------------ (3)

_{3Fe 2 O 3 → 2FeO · Fe} 2 O 3 + 1 / 2O 2 --------------------------------- ( 4)

Equation (1) is a reaction caused by evaporation of interlaminar or crystalline water and is used for foaming pearlite or dilatation blood pressure.

Equation (2) is the oxidation reaction of organic matter, and this corresponds to foaming of waste glass.

Equation (3) is a calcination reaction of limestone and is a representative foaming mechanism of foamed glass.

Equation (4) is a reduction mechanism occurring at high temperature of 1000 ℃ or higher, and is a foaming mechanism of general artificial lightweight aggregate.

The four foaming gas formation reactions are closely related to the behavior of the surface capable of capturing the foaming gas. The surface behavior is largely defined as (A) viscous behavior and (B) surface densification.

(A) Viscous behavior is a behavior that occurs mainly in low melting point compounds such as glass, the surface viscous behavior at a temperature above the softening point, it is possible to increase the volume expansion coefficient due to foaming, it is possible to manufacture ultralight aggregates. However, since the surface is liquid, it is not easy to prevent the fusion between the aggregates is a surface behavior principle mainly used in the production of foam glass in the form of panels or tiles.

(B) Surface densification is a mechanism in which the surface pores become smaller than the size of the internal pores of the aggregate, and the internal foaming occurs while the discharge rate of the foaming gas emitted from the inside is delayed at the surface. Such a mechanism is not suitable for the production of ultra-light aggregates because of less capture of internal foaming gas, but the fusion between aggregates does not occur in the manufacture of artificial lightweight aggregates with a volume specific gravity of about 1.5, and is widely used.

On the other hand, Korean Patent Registration No. 481,043 of the Korea National Institute of Technology discloses a technology relating to fine lightweight aggregates using the waste glass and its manufacturing method. Since waste glass and inorganic waste by-products are used as raw materials, they are very valuable in terms of environmental protection and recycling of resources, and they can be applied to ships or military ships, but they are still additional materials such as foaming agents and molding aids for light weight. There is a disadvantage that it is necessary.

In addition, a technique for manufacturing lightweight aggregates using expanded clay and waste glass powder as the main raw materials has been disclosed as in the method of manufacturing ultralight aggregate using expanded clay (Korea Patent Publication No. 2003-0071419), but waste glass with respect to 100 wt% of expanded clay Since the amount of used is only 2 ~ 10 wt%, the amount of waste glass used is small, which does not meet the goal of recycling.

The inventors also produce artificial lightweight aggregate using waste glass for environmental protection and resource recycling, without using additional raw materials such as blowing agent, binder, etc. used in the manufacture of general artificial lightweight aggregate, using a simple raw material composition Continued research on environmentally friendly artificial lightweight aggregate.

Therefore, the present inventors have made efforts to manufacture environmentally friendly artificial light weight aggregates, and as a result, by establishing a foaming mechanism of waste glass to minimize the fusion phenomenon when a large amount of waste glass is used, the foaming agent while significantly improving the recycling rate of waste glass Even without using, it was confirmed that the environment-friendly artificial lightweight aggregate can be manufactured through the process of crushing, forming and firing waste glass and red clay using the foaming mechanism of the waste glass itself, thereby completing the present invention.

It is an object of the present invention to provide an environmentally friendly artificial light weight aggregate containing waste glass and red clay and a method of manufacturing the same.

In order to achieve the above object, the present invention comprises the steps of (a) pulverizing waste glass and red clay to prepare a pulverized product; (b) forming the pulverized product to produce a molded product; And (c) calcining the molding to obtain an artificial light weight aggregate, and providing an environmentally friendly artificial light weight aggregate containing waste glass and red clay.

The present invention also provides an environmentally friendly artificial lightweight aggregate containing waste glass and red clay prepared by the above method.

According to the present invention, it is possible to manufacture artificial lightweight aggregate without using a blowing agent while significantly improving the recycling rate of waste glass, and can recycle the environmentally friendly and economical artificial lightweight aggregate by recycling the waste glass.

In one aspect, the present invention comprises the steps of: (a) grinding the waste glass and red clay to produce a pulverized product; (b) forming the pulverized product to produce a molded product; And (c) calcining the molding to obtain an artificial light weight aggregate, the method for producing an environmentally friendly artificial light weight aggregate containing waste glass and red clay.

The waste glass used in the present invention is a typical soda-lime glass, which contains dust and the like, is amorphous, and foams while forming a surface at the low melting point and softening temperature of the waste glass to form pores, It shows the effect of light weight and resource recycling of artificial light weight aggregate.

Red clay used in the present invention refers to an alumina silicate mineral containing a large amount of iron as a soil used as a raw material of red brick, and a binder used in manufacturing general artificial light aggregate using the viscosity characteristic of red clay. It acts as a binder and has an effect of making molding well.

In the present invention, it may be characterized in that the red clay 25 to 67 parts by weight based on 100 parts by weight of the waste glass. When the content of red clay is less than 25 parts by weight based on 100 parts by weight of waste glass, foaming by waste glass is excessively generated, and the utility as building materials is lowered. When it exceeds 67 parts by weight, foaming by waste glass is insignificant. Since the weight reduction achieved by the iron reduction reaction _{(3Fe 2 O 3 → 2FeO ·} Fe 2 O 3 + 1 / 2O 2) of, so to be calcined at over 1,000 ℃ high temperature, there is a disadvantage that the expensive production cost consuming. More preferably, the red clay may be 25 to 43 parts by weight based on 100 parts by weight of waste glass.

 In the present invention, the firing temperature may be characterized in that 700 ~ 1000 ℃. If the firing temperature is less than 700 ℃ firing is not made sufficiently and foaming of the waste glass is not made sufficiently, if the firing temperature exceeds 1000 ℃ firing cost is expensive, there is a problem that the waste glass is excessively foamed.

In the present invention, the firing time may be characterized in that 5 to 15 minutes. If the firing time is less than 5 minutes, the firing is not sufficiently made and foaming of the waste glass is not made sufficiently, and if the firing time exceeds 15 minutes, there is no benefit due to the increase of the firing time, and there is a problem that the waste glass is excessively foamed.

The present invention relates to an environmentally friendly artificial light weight aggregate containing waste glass and red clay prepared by the above method in another aspect.

The eco-friendly artificial light weight aggregate according to the present invention plays a role of a blowing agent and a binder, which are essentially used in the manufacture of artificial light weight aggregates using waste glass as raw materials, respectively. Can be prepared. In addition, by establishing a foaming mechanism of waste glass to manufacture artificial lightweight aggregate using a large amount of waste glass, it has dramatically improved the recycling rate of waste glass at a low temperature of less than 1000 ℃ to secure economic feasibility and conventional disposal By using waste glass, it is meaningful that it can contribute to resource recycling and environmental problems.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention, it will be apparent to those skilled in the art that the scope of the present invention is not to be construed as being limited by these examples.

Example 1 Analysis of Chemical Composition, Crystal Phase and Thermal Properties of Waste Glass and Red Clay

The chemical composition of glass powder and red clay was analyzed using an X-ray diffractometer (X-ray Fluorescence, XRF, ZSX-100e) (Rigaku, Japan). Here, the waste glass is a window glass collected during the demolition at the construction site, red clay was used to buy from Cera Green Co., Ltd. (Korea).

As a result, as shown in Table 1, the waste glass has a R ₂ O (Na ₂ O + K ₂ O) of 12.73wt%, RO (CaO + MgO) is 11.42wt%, RO ₂ (SiO ₂ ) is A typical soda-lime glass (64.99wt%) and red clay was confirmed to be an alumina silicate mineral containing a large amount of iron.

lg.
loss SiO ₂ Al ₂ O ₃ Fe ₂ O ₃ CaO MgO Na ₂ O K ₂ O TiO ₂ P ₂ O ₅ Cr ₂ O ₃ MnO Total Red clay 11.00 57.76 19.02 7.05 0.20 1.04 0.09 2.53 0.92 0.17 0.00 0.22 100 Waste glass 6.62 65.26 2.14 1.42 8.21 3.21 12.27 0.46 0.28 0.02 0.05 0.06 100

In addition, the crystal phases of waste glass and red clay were analyzed using an X-ray diffractometer (X-ray Fluorescence, XRF) (RINT-8100H / PC, Rigaku, Japan).

As a result, as shown in Figure 1, it was confirmed that the waste glass is an amorphous phase (Fig. 1 (a)), red clay is a crystal phase mixed with Albite (Fig. 1 (b)).

In addition, the thermal properties of waste glass and red clay were analyzed using a thermogravimetric / differential thermal analyzer (TG / DTA) (STA 409 C / CD, Netzsch. Co., Germany).

As a result, as shown in FIG. 2, the waste glass has an exothermic reaction at 350 ° C and simultaneously loses weight, thereby oxidizing organic matter, and a slight endothermic reaction occurs at around 700 ° C. It can be seen that (Fig. 2 (a)). It can be seen that the red clay evaporates the crystal water of Kaolinite minerals due to the endothermic reaction at the same time around 550 ℃ (Fig. 2 (b)), and as a result, Kaolinite minerals not found in XRD It was found that this exists.

Example 2: Environment-friendly Artificial Lightweight Aggregate Manufacturing Conditions Using Waste Glass and Red Clay

In order to set the conditions for the manufacture of environmentally friendly artificial light weight aggregate using waste glass and red clay, through the plastic experiment of artificial light aggregate using waste glass and artificial light aggregate using red clay, using the waste glass and red clay of Example 1, After confirming the foaming mechanism, the firing temperature of artificial light aggregate was set according to the mixing ratio of waste glass and red clay.

2-1. Foaming Experiment of Artificial Lightweight Aggregate Using Waste Glass

500kg of waste glass was pulverized to 80mesh, and then the artificial light weight aggregates were calcined at 700 ° C, 750 ° C, 800 ° C and 850 ° C for 10 minutes. As a result, as shown in Figure 3 (a), it was foamed at 750 ℃, the specific gravity was 1 or less. The TG / DTA analysis of Example 1 shows that the foaming point was caused by oxidation of the softening point and the organic material around 700 ° C.

2-2. Foaming Experiment of Artificial Lightweight Aggregate Using Red Clay

550kg of red clay was pulverized to 80mesh, and the artificial lightweight aggregate prepared by molding was calcined at 1100 ° C, 1150 ° C, 1200 ° C and 1250 ° C for 10 minutes, respectively. As a result, as shown in FIG. 3B, it was confirmed that sintering proceeded without foaming at all.

2-3. Firing Temperature of Artificial Lightweight Aggregate Using Waste Glass and Red Clay

Based on the results of 2-1 and 2-2, the mixing ratio and firing temperature of the waste glass and red clay were set as shown in Table 2. Here, the setting of the firing temperature was determined to increase the firing temperature as the amount of red clay increased to a temperature lower than the eutectic point 950 ℃ ~ 1400 ℃ range based on the ternary system as shown in FIG.

Waste Glass (wt%) Red Clay (wt%) Firing temperature (℃) 100 0 700, 750, 800, 850 90 10 700, 750, 800, 850 80 20 800, 850, 900, 950 70 30 800, 850, 900, 950 60 40 1000, 1050, 1100, 1150 50 50 1000, 1050, 1100, 1150 40 60 1000, 1050, 1100, 1150 30 70 1100, 1150, 1200, 1250 20 80 1100, 1150, 1200, 1250 10 90 1100, 1150, 1200, 1250 0 100 1100, 1150, 1200, 1250

Example 3: Manufacture of Environment-friendly Artificial Lightweight Aggregate Containing Waste Glass and Red Clay

Using the waste glass and red clay of Example 1, an environmentally friendly artificial lightweight aggregate was prepared by the addition amount and firing temperature according to the content of the waste glass and red clay as shown in Table 3.

content Amount Firing temperature (℃)
Waste Glass (wt%) Red Clay (wt%) Waste Glass (kg) Red clay (kg) One 100 0 100 0 700, 750, 800, 850 2 90 10 90 10 700, 750, 800, 850 3 80 20 80 20 800, 850, 900, 950 4 70 30 70 30 800, 850, 900, 950 5 60 40 60 40 1000, 1050, 1100, 1150 6 50 50 50 50 1000, 1050, 1100, 1150 7 40 60 40 60 1000, 1050, 1100, 1150 8 30 70 30 70 1100, 1150, 1200, 1250 9 20 80 20 80 1100, 1150, 1200, 1250 10 10 90 10 90 1100, 1150, 1200, 1250 11 0 100 0 100 1100, 1150, 1200, 1250

3-1. Manufacture of crushed waste glass and red clay

Using a pin mill (Korea Machinery, Korea), waste glass and red clay were ground to an average particle diameter of 20㎛.

3-2. Manufacture of moldings of grinding

The pulverized product prepared in 3-1 was molded into a sphere having a diameter of 10 mm.

3-3. Firing of moldings

The molded article prepared in 3-2 was calcined for 10 minutes to prepare an artificial lightweight aggregate.

As a result, as shown in Figure 4, artificial lightweight aggregate containing 100wt% waste glass (Fig. 4 (a)) and artificial lightweight aggregate containing 90wt% waste glass and 10wt% red clay (Fig. 4 (b)) As the firing temperature increases, pores of the cross section expand, specific gravity decreases, and the liquid phase is observed on the surface. In addition, the artificial lightweight aggregate containing 80 wt% of waste glass and 20 wt% of red clay (FIG. 4 (c)) and the artificial lightweight aggregate containing 70 wt% of waste glass and 30 wt% of red clay (FIG. 4 (d)) also had a firing temperature. As the pores of the cross section expand and there is little change in specific gravity, the absorption rate decreases rapidly, indicating that surface densification proceeds.

In addition, as shown in Figure 5, artificial light aggregate containing 60wt% waste glass and 40wt% red clay (FIG. 5 (a)), artificial light aggregate containing 50wt% waste glass and 50wt% red clay (in Figure 5 (b)) and the artificial light weight aggregate containing 40 wt% of waste glass and 60 wt% of red clay were found to have black cores. Black core is a reduction reaction by 3Fe ₂ O ₃ → 2FeO · Fe ₂ O ₃ + 1 / 2O ₂ , which indicates that the interior of the artificial light aggregate is black. It can be seen that the size of the.

In addition, as shown in Figure 6, artificial light aggregate containing 30wt% waste glass and 70wt% red clay (Fig. 6 (a)), artificial light aggregate containing 20wt% waste glass and 80wt% red clay (FIG. b)) and artificial light aggregate (10 (c)) containing 10 wt% of waste glass and 90 wt% of red clay, the formation of black core is more pronounced, and as the firing temperature increases, the number of pores in the black core area decreases. The pore size was confirmed to be larger. This is due to coalescence of small pores and expansion of the foaming gas.

Experimental Example 1 Investigation of Foaming Temperature According to Waste Glass Content in Artificial Lightweight Aggregate

1-1. Foaming Temperature by Waste Glass Content of Artificial Lightweight Aggregate with Volume Specific Gravity 1.1

In order to identify the foaming mechanism of artificial lightweight aggregate including waste glass and red clay prepared in Example 3, the foaming temperature at which the specific gravity of artificial lightweight aggregate is 1.1 according to the waste glass and red clay content is shown in a graph.

As a result, as shown in Figure 7, it was confirmed that the slope is changed from the artificial light aggregate containing 60wt% waste glass and 40wt% red clay. In addition, as shown in FIG. 8, when the waste glass content is 70wt% or more, fine pores are distributed in the cross-section of the artificial light aggregate without the black core, while the waste glass content is in the cross section of the artificial light aggregate having 60wt% or less. It could be confirmed that the black core was formed.

The above results indicate that when the waste glass is 70wt% or more, the surface behavior of the artificial lightweight aggregate follows the viscous behavior while the foaming gas is generated by the reaction equation: CmHn + (m + n / 4) O ₂ → mCO ₂ (g) + n / 2H will due to the organic matter oxidation by ₂ O (g), when the waste glass is less than 60wt% is while following the surface densified surface behavior is not enough amount of liquid to wrap the surface of the artificial lightweight aggregate foaming gas generation reaction scheme: 3Fe ₂ O _This is due to the generation of black core by ₃ → 2FeO · Fe ₂ O ₃ + 1 / 2O ₂ .

1.2. Foaming Temperature by Waste Glass Content of Artificial Lightweight Aggregate with Volume Specific Gravity Below 1

In order to identify the foaming mechanism of the artificial lightweight aggregate including waste glass and red clay prepared in Example 3, the foaming temperature at which the volume specific gravity of the artificial lightweight aggregate according to the waste glass and red clay content is less than or equal to 1 is shown in a graph. .

As a result, as shown in FIG. 9, similar to FIG. 7, it was confirmed that the slope of the artificial light aggregate including 60 wt% of waste glass and 40 wt% of red clay changed from the starting point. In addition, when the waste glass is less than 60wt% in Figures 9 and 7, the slope of the foaming temperature graph according to the waste glass and red clay content is similar as -4.0 and -4.1, respectively, and when the waste glass is more than 70wt%, waste glass and red clay The slopes of the foaming temperature graphs according to the contents were all equal to -9.5, thereby verifying the consistency of the experiment.

In addition, as shown in FIG. 10, when the waste glass content is 70wt% or more, there are many fine pores in the cross section of the artificial light aggregate without black core, whereas the waste glass content is on the cross section of the artificial light aggregate having 60wt% or less. It was confirmed that the black core was formed, showing similar results as in FIG. 8. The pore size also shows a lot of fine pore distribution when the content of waste glass is more than 70wt%, and when the content of waste glass is less than 60wt%, it appears that large pores exist.When the waste glass content is more than 70wt%, the waste glass content is It was confirmed that the foaming mechanism is different in the two cases of less than 60wt%.

Therefore, when the content of waste glass is 70wt% or more, it is possible to manufacture ultra-light aggregates with many microporous distribution structures due to the viscous behavior of the surface, so that it can be used as a non-structural building material, and the artificial light weight when the waste glass content is less than 60wt%. Aggregates have shown potential for development as structural building materials.

After all, when the waste glass content is 60 ~ 80wt%, the firing temperature is 700 ~ 1000 ℃, it can be confirmed that the artificial lightweight aggregate can be produced to maximize the foaming while preventing the fusion phenomenon by the waste glass. there was.

Experimental Example 2: Properties of Artificial Lightweight Aggregate Containing Waste Glass and Red Clay

The physical properties of the artificial light aggregate including waste glass and red clay prepared in Example 3 and light weight aggregate based on waste glass of soda lime silicate of Korea Patent 281,793 were compared.

As a result, as shown in Table 4, compared with the light weight aggregate of Korean Patent No. 281,793, which is a light weight aggregate based on waste glass, the artificial light weight aggregate prepared in Example 3 has a high specific gravity and low absorption rate at low temperature. It was confirmed that the artificial lightweight aggregate of physical properties can be obtained. In addition, among the artificial lightweight aggregates of various compositions of Example 3, the physical properties of artificial lightweight aggregates having a content of 60 to 80 wt% of waste glass (ie, 25 to 67 parts by weight of red clay with respect to 100 parts by weight of waste glass) are excellent. Among them, it was confirmed that the content of waste glass at 70wt% indicates the best physical properties.

Furtherance Firing temperature (℃) Volume specific gravity Absorption rate (%)
Example 3
Artificial lightweight aggregate
Waste glass 100 wt% 775 1 or less 13 Waste Glass 80wt%: Red Clay 20wt% 800 1.2 33.2 Waste Glass 70wt%: Red Clay 30wt% 850 1.3 3.8 Waste Glass 60wt%: Red Clay 40wt% 1000 1.3 18.6 Korea registered patent
281,793
Lightweight aggregate
Expanded clay 100wt%,
100 wt% of paper sludge in dehydrated cake, 20 wt% of fully dried paper sludge,
Expanded perlite 12 wt%,
Iron oxide (Fe ₂ O ₃ ) and waste glass powder 6 wt%
1050-1250
0.72
10.8

While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will appreciate that such specific embodiments are merely preferred embodiments and that the scope of the present invention is not limited thereby. something to do. Thus, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

1 is a graph showing a result of crystal phase analysis (a) of waste glass and a result of crystal phase analysis (b) of red clay.

2 is a graph showing the thermal characteristics analysis result (a) of the waste glass and the thermal characteristics analysis result (b) of red clay.

Figure 3 shows the cross-section and physical properties (a) of artificial lightweight aggregate using waste glass according to the firing temperature and the cross-section and physical properties (b) of artificial light aggregate using red clay according to the firing temperature.

4 is an artificial light weight aggregate (a) having a content of 100 wt% of waste glass; Artificial light aggregate (b) containing 90 wt% of waste glass and 10 wt% of red clay; Artificial lightweight aggregate (c) containing 80 wt% of waste glass and 20 wt% of red clay; And it shows the cross-section and physical properties of artificial light weight aggregate containing 70 wt% waste glass and 30wt% red clay.

5 is an artificial light aggregate (a) containing 60 wt% of waste glass and 40 wt% of red clay; Artificial light aggregate (b) containing 50 wt% of waste glass and 50 wt% of red clay; And it shows the cross-section and physical properties of artificial lightweight aggregate (c) containing 40 wt% waste glass and 60 wt% red clay.

6 is an artificial light aggregate (a) containing 30 wt% waste glass and 70 wt% red clay; Artificial light aggregate (b) containing 20 wt% waste glass and 80 wt% red clay; Artificial lightweight aggregate (c) containing 10 wt% of waste glass and 90 wt% of red clay; And it shows the cross-section and physical properties of artificial lightweight aggregate containing 100 wt% red clay.

FIG. 7 is a graph showing the foaming temperature at which the volume specific gravity of artificial light aggregate including waste glass and red clay becomes 1.1 according to the content of waste glass and red clay.

8 is a photograph showing a cross-section of the artificial lightweight aggregate at a foaming temperature at which the volume specific gravity of the artificial lightweight aggregate including waste glass and red clay becomes 1.1.

9 is a graph showing the foaming temperature at which the specific gravity of the artificial light weight aggregate including waste glass and red clay is 1 or less, according to the amount of waste glass and red clay.

10 is a photograph showing a cross section of the artificial lightweight aggregate at a foaming temperature at which the volume specific gravity of the artificial lightweight aggregate including waste glass and red clay is 1 or less.

Figure 11 shows an artificial light aggregate containing waste glass and red clay according to the present invention, which shows the samseong boundary that is the basis for setting the firing temperature according to the content of the waste glass and red clay.

Claims (4)

A method for producing an environmentally friendly artificial light weight aggregate containing waste glass and red clay, comprising the following steps: (a) pulverizing waste glass and red clay to produce a pulverized product; (b) forming the pulverized product to produce a molded product; And (c) calcining the molding to obtain an artificial light weight aggregate. The method according to claim 1, wherein the red clay is 25 to 67 parts by weight based on 100 parts by weight of the waste glass containing dust. The method of claim 1, wherein the firing temperature is 700 ~ 1000 ℃. An environmentally friendly artificial lightweight aggregate containing waste glass and red clay prepared by the method of any one of claims 1 to 3.

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