KR20050103058A - Lightweight aggregate having a dual foam cell, and process for preparing thereof - Google Patents

Abstract

The present invention relates to an ultralight aggregate having a double foamed cell and a method for producing the ultralight aggregate according to the present invention, which comprises: a) sodium silicate liquid nSiO ₂ Na ₂ 0xH ₂ O (n is 3 to 4) .) Preparing a functional water by adding one or two or more mixtures selected from clay, waste concrete powder or functional ceramic powder; b) drying the prepared functional water glass to produce functional water and pulverizing the functional water; c) one or two or more mixtures selected from calcium oxide, calcium hydroxide or cement and one or two or more mixtures selected from boron oxide, boric acid or borax powder are mixed with the ground functional water Assembling; d) foaming at a low temperature and stabilizing at a high temperature, and in another aspect of the production process a) sodium silicate liquid nSiO ₂ Na ₂ 0xH ₂ O (n is 3 to 4), boron oxide, boric acid Or wet grinding one or two or more mixtures selected from 20 to 30% by weight of borax powder, calcium oxide, calcium hydroxide or cement to prepare a slurry; b) one or two or more mixtures selected from sodium silicate liquid nSiO ₂ Na ₂ 0xH ₂ O (n is 3 to 4) and clay, waste concrete powder or functional ceramic powder and prepared in step a) Mixing the slurry to prepare functionalized water; c) drying the prepared functional water glass to produce particles; d) foaming and stabilizing the dried particles. The ultralight aggregate according to the present invention has the advantage that the foamed pore structure has a low porosity, low moisture absorption and thermal conductivity, and high strength.

Description

Lightweight aggregate having a dual foam cell, and process for preparing approximately

The present invention relates to an ultralight aggregate having a double foamed cell and a method of manufacturing the same. The method for manufacturing the initial lightweight aggregate is prepared by grinding or granulating expanded shale or expanded clay, as known in Korean Patent Publication No. 79-1985, Japanese Patent Publication No. 41-9023, and heating it at 1000 to 1300 ° C. Although it is characterized in that the collection of expandable natural mineral raw materials, such as expanded shale and expanded clay, there is a limit to the non-expandable ceramic raw materials as known in the Republic of Korea Patent Publication No. 80-1056, Japanese Patent Publication No. 48-8449 The addition of organic or inorganic blowing agents has been devised.

Korean Patent Publication Nos. 73-166, 80-1054, and 0187458, Japanese Patent Publication No. 46-32279, and Japanese Patent Application Publication No. 51-105327 disclose the occurrence of fly ash, slag, and aluminum. By producing light weight aggregates using mineral wastes such as red mud, water sludge, sewage sludge, waste oil treatment sludge, and waste glass sludge, it is proposed to reduce the amount of waste generated and to secure economic feasibility.

In Korean Patent Laid-Open Publication No. 2003-0025361, a binder suspension and a surface modifier are coated on expanded pearlite to improve absorbency, abrasion resistance, and bonding strength with cement, thereby attempting to use the expanded pearlite as a cement structure. 0221029 and Korean Unexamined Patent Publication No. 1990-0003088, US Patent Publication No. 06218002, US Patent Publication No. 0411355 disclose various organic or inorganic coating agents to reduce the tendency of material separation between polystyrene beads and cement mortar and to increase affinity with cement. As a coating method, the use of polystyrene beads as a cement structure has been attempted.

In Korean Laid-Open Patent Publication No. 2003-75295, an ultra-light refractory insulating material which is foamed and molded by mixing sodium silicate and metal oxide or waste material powder in water is known. In Korean Laid-Open Patent Publication No. 2003-00758796, boric acid and a blowing agent are added to water glass. It is known to prepare a foam by heating and then to manufacture the inorganic insulating material using a cement, a filler and a binder. Another method using water glass is described in German Patent P4107230.8 in the form of a powder in the spray drying zone. A method for producing a foam obtained by forming sodium silicate and heat-treating it in a rotary kiln is disclosed.

The method of using expanded clay in the above-described invention has problems of depletion and natural damage due to the collection of burial resources, and the method of high temperature calcination of waste is difficult to control the process in uneven internal cells and foaming methods. In terms of absorption rate, strength and density, it is known that production of high quality lightweight aggregate is virtually impossible. In addition, the lightweight aggregate made by coating a hydrophilic coating material on the polystyrene bead has a problem that it is not possible to put a large amount of polystyrene bead lightweight aggregate because it does not have the strength of the lightweight aggregate, and it is inevitable that the strength of the lightweight concrete using the same. In addition, in the surface-modified lightweight aggregate of expanded pearlite, a problem of making spherical particles and an additional cost of the coating process and the coating agent causes an increase in the cost of the lightweight aggregate.

In addition, the method using the water glass foam has a disadvantage in that the water glass foam itself is not water resistant and soluble in water. In order to overcome this problem, the Republic of Korea Patent Publication No. 2003-0075879 discloses a method of preparing an inorganic foamed thermal insulator by adding 0.5 to 2.5% by weight of boric acid to water glass, but a method of directly adding boric acid to water glass The amount of boric acid added cannot exceed 2.5% by weight due to the gelation reaction, so the amount of boric acid added is extremely small. Therefore, it does not have a great effect on the improvement of water resistance, and even a small amount of boric acid is required, The energy consumed when evaporating increases, and the water glass foam prepared by the above method has a very low density but the strength of the water glass foam is very low so that the water glass foam is broken when mixed with cement mortar. There is an inadequate problem with lightweight aggregate.

Accordingly, in the present invention, in consideration of the problems of the prior art as described above, as an ultra-light weight aggregate, the light weight aggregate having a double foamed cell having excellent strength, very low absorption rate and chemical resistance, and a method of manufacturing the same are provided. The purpose.

The present invention relates to an ultralight aggregate having a double foamed cell and a method for producing the ultralight aggregate having a double foamed cell according to the present invention.

a) Manufacture of functional water glass from sodium silicate liquid and clay

b) manufacturing functionalized water powder by drying and pulverizing the functional water glass;

c) Granulation of functionalized water powder by adding calcium oxide and boric acid

d) foaming and stabilization

As another method for producing ultra-light aggregates made through a step, having double foamed cells,

e) slurry production by wet grinding from sodium silicate liquid, boric acid, calcium oxide, etc.

f) Preparation of functional water glass by mixing the prepared slurry with sodium silicate liquid and clay

g) manufacturing functional water glass by drying the prepared functional water glass

h) foaming and stabilization

It is manufactured through a step.

The manufacturing method of the ultra-light aggregate with the double foamed cell which concerns on this invention is demonstrated concretely.

Ultralight aggregates having a double foamed cell according to the present invention comprise a) sodium silicate liquid nSiO ₂ Na ₂ OxH ₂ O (n is 3 to 4) with a water content of 55 to 70 wt. Preparing a functional water glass by adding one or two or more mixtures selected from%, 5 to 25% by weight of clay, waste concrete powder or functional ceramic powder; b) drying the prepared functional water glass to produce functional water and pulverizing the functional water; c) 3 to 12% by weight of one or two or more mixtures selected from calcium oxide, calcium hydroxide or cement and one or two or more mixtures selected from boron oxide, boric acid or borax powder on the basis of ground functionalized water Granulating by mixing the wt% with the ground functionalized water powder; d) foaming at a temperature of 120-300 ° C. and stabilizing at 550-700 ° C.

The sodium silicate liquid used in the present invention has a water content of 55 to 70% by weight and the sodium silicate liquid has a chemical formula of nSiO ₂ Na ₂ OxH ₂ O and n of 3 to 4, more preferably. It is preferable that the moisture content is 60 to 65% by weight.

A conventional sodium silicate liquid is prepared by heating and pressing anhydrous sodium silicate cullet (n is 3 to 4) and caustic soda together with water, where n has a value of 0.5 to 4 depending on the amount of caustic soda added. Ordinary sodium silicate liquid General No. 1 and General No. 2 or KS type 1 and KS type 2 have a disadvantage of deteriorating water resistance and chemical resistance due to high sodium oxide content as n has 2 to 2.5 and is suitable for the purpose of the present invention. I can't. Ordinary sodium silicate liquid General No. 3 and General No. 4 or KS 3 and KS 4 have n of 3 to 4 and a water content of 62 to 70% by weight. For the above reason, the sodium silicate liquid which can be used in the present invention can use the general general No. 3 and the general No. 4 or the KS 3 and the KS 4 species, and it is easy to control the appropriate water content and from the anhydrous sodium silicate in terms of cost. The method of obtaining is preferable. Method from anhydrous sodium silicate to obtain a sodium silicate solution (n is 3 to 4.) of Na ₂ O · nSiO ₂ so as to have a proper moisture anhydrous sodium silicate in Glass cullet from the autoclave to a water content of 55 if 70% by weight It is preferable to use what was added to the water and then mixed under a temperature of 150 to 200 ° C. and a pressure of 6 to 10 kgf / cm ² to stand for about 1 to 2 hours.

If the water content of the sodium silicate liquid is less than 55% by weight, the viscosity becomes too high, and workability is lowered. If the water content exceeds 70% by weight, the production cost increases due to the increase of dry energy due to excessive water.

In addition to the addition of clay to the sodium silicate liquid to produce a functional water glass, one selected from waste concrete powder or functional ceramic powder may be used, and the clay, waste concrete powder or a mixture of two or more functional ceramic powders may be used, The functional ceramic powder is a ceramic powder exhibiting characteristics of adiabatic reflection effect, far-infrared radiation effect, photocatalytic effect, and anion generating effect. Single or a mixture of two or more of yttrium oxide, cordierite, lanthanum oxide and cerium oxide is preferable. The clay to be added uses a 200 mesh through powder, and the waste concrete powder or functional ceramic powder is preferably pulverized with a conventional mill capable of continuous grinding such as a hammer mill or a disk mill roller mill to use a 200 mesh passed powder.

The clay, waste concrete powder or functional ceramic powder controls the amount of foam while being incorporated into the sodium silicate liquid and serves to maintain excellent strength in the foam.

The prepared functional water glass is dried to prepare a functionalized water, and the functionalized water is crushed to prepare a functional watered water powder.

Drying and pulverizing the functionalized water may be a conventional drying and grinding method, but spray drying is preferable, and spray drying of the functional water glass at 150 to 250 ° C. is particularly preferable while maintaining the temperature of 50 to 90 ° C., wherein The water content of the functionalized water powder after drying is preferably 22 to 34% by weight for use in subsequent processes. The functional water glass has a characteristic that the viscosity change is severe depending on the temperature, so the workability is reduced by high viscosity at room temperature, thereby maintaining the effect of lowering the viscosity and improving workability by maintaining 50 to 90 ° C. The large size of the functionalized water powder may increase the size of the expanded aggregate particles or affect the strength and hardness. Therefore, the particle size of the dried functional water powder is preferably 200 mesh or less, and if necessary, an additional grinder may be used. It is also preferable to go through the process of grinding.

Granulated by mixing powdered powder selected from calcium oxide, calcium hydroxide or cement, or powder mixture selected from boron oxide, boric acid or borax, or powder mixture selected from boron oxide, boric acid or borax with mixed functionalized water do.

The cement to be added may be any conventional cement, including portant cement, blast furnace slag cement, fly ash cement and the like.

The amount of calcium oxide, calcium hydroxide or cement powder added is appropriately 3 to 12% by weight, preferably 4 to 8% by weight, and the amount of boron oxide, boric acid or borax powder added to the functional water powder. 3 to 12% by weight is suitable, and 4 to 8% by weight is preferred.

Mixing of the functional powder with calcium oxide, boric acid, etc. may be a mixer that mixes ordinary powders, and in particular, a V mixer, a double screw mixer, a drum mixer, a ribbon mixer, and the like are preferable. Promotes chemistry

The mixed functional water mixed powder is granulated to a size of 0.1 to 4 mm in diameter, and the granulation process may be any conventional granulator, but granulation using pelletizing, extrusion granulation, or a pan coater is preferable.

The assembled functional hydrosphere is subjected to foaming and stabilization at low temperature to produce an ultralight aggregate having a double foamed cell of interest in the present invention.

Foaming is appropriate to use a rotary kiln, foaming is carried out at a temperature of 120 to 300 ℃, preferably in the foam section of the rotary kiln primary foaming at a temperature of 120 to 180 ℃, a temperature of 220 to 300 ℃ After second foaming, stabilize at a temperature of 550 ~ 700 ℃ in the rear heat treatment section of rotary kiln.

In the above foam section, the granulated spheroids are first foamed at 120 to 180 ° C., and the walls of the cell are secondly foamed at 220 to 300 ° C ..

However, the lightweight aggregate foamed in the foam section is very weak in strength, so that the heat treatment at 550 to 700 ℃ in the heat treatment section to increase the chemical mixing of the composition to promote the rearrangement of the cell and the phase transformation from the amorphous foam to the partially crystalline foam To increase the strength and chemical resistance. The foaming process and the stabilizing process may be further performed in a rotary kiln that is integrally formed or in a rotary kiln operated as an independent apparatus after foaming.

As shown in the scanning electron microscope cross section of the ultralight aggregate having the double foamed cell of FIG. 1, the ultralight aggregate having the double foamed structure according to the present invention has a main foamed pore size of 100 to 300um and surrounds the main foamed pores. The fine foamed pore is less than 50 μm, and due to the double foamed cell structure, the ultra-light aggregate according to the present invention has a very low density and a very high strength. Particularly, the fine foamed pores formed during the secondary foaming are waste convection. It suppresses the effect of raising the thermal insulation effect.

Meanwhile, silica sand, calcium carbonate, and cement that are not melted at 700 ° C. at the end of the granulation step to overcome the case in which workability is reduced due to entanglement between aggregate and aggregate or between aggregate and furnace wall in the heat treatment section. It may include the step of coating with a ceramic powder, such as alumina.

Another method for producing an ultralight aggregate having a double foam structure according to the present invention is e) a water content of 55 to 70% by weight and sodium silicate liquid nSiO ₂ Na ₂ O x H ₂ O (n is 3 to 4 40 to 60% by weight, 20 to 30% by weight of boron oxide, boric acid or borax powder, one or two or more mixtures selected from calcium oxide, calcium hydroxide or cement are mixed and wet pulverized by mixing 20 to 30% by weight. Preparing a; f) 55 to 70% by weight of water and sodium silicate liquid nSiO ₂ Na ₂ 0xH ₂ O (n is 3 to 4) 65 to 85% by weight and 1 selected from clay, waste concrete or functional ceramic powder 5 to 30% by weight of the species or two or more mixtures and 10 to 30% by weight of the slurry prepared in step e) to prepare a functional water glass; g) drying the prepared functional water glass to produce particles; h) foaming and stabilizing the dried particles.

The water content used in the present production method is 55 to 70% by weight and the sodium silicate liquid nSiO ₂ Na ₂ O x H ₂ O (n is 3 to 4), as mentioned above, anhydrous sodium silicate vitreous collet Na ₂ O · nSiO ₂ is preferably used one prepared by dissolving in high-temperature high-pressure water was added to the (n 3 is 1-4.).

 In the case of the present invention, a powder selected from boron oxide, boric acid, or borax or a mixture of two or more powders is the same as the phenomenon in which the sodium silicate liquid solidifies when the above-mentioned sodium silicate liquid contains 2 wt% or more of boric acid. When 20 to 30% by weight is added, the solidification reaction of the sodium silicate liquid occurs in the same manner, and 20 to 30% by weight of one or two or more mixtures selected from calcium oxide, calcium hydroxide or cement is added thereto. Then, a white sodium silicate slurry is produced using a conventional wet mill such as a ball mill.

The prepared sodium silicate slurry is 10 to 30% by weight, 55 to 70% by weight of water, and sodium silicate liquid nSiO ₂ Na ₂ OxH ₂ O (n is 3 to 4) 65 to 85% by weight of clay, waste Functional water glass is prepared by mixing 5 to 30% by weight of one or two or more mixtures selected from concrete powder or functional ceramic powder.

The functional ceramic powder is a ceramic powder exhibiting characteristics of adiabatic reflection effect, far-infrared radiation effect, photocatalytic effect, and anion generating effect. The ceramic powder exhibiting such characteristics is titanium dioxide, silver oxide, iron oxide, copper oxide, barium carbonate, aluminum oxide, Single or a mixture of two or more of yttrium oxide, cordierite, lanthanum oxide and cerium oxide is preferable. The clay to be added uses a 200 mesh through powder, and the waste concrete powder or functional ceramic powder is preferably pulverized with a conventional mill capable of continuous grinding such as a hammer mill or a disk mill roller mill to use a 200 mesh passed powder.

The clay, waste concrete powder or functional ceramic powder in the same manner as the above-mentioned manufacturing method controls the amount of foam while being incorporated into the sodium silicate liquid and serves to maintain excellent strength in the foam.

The functional water glass thus prepared is dried in the same manner as mentioned above to prepare particles, and to prepare the ultra-light aggregate having a double foamed cell structure according to the present invention through the step of foaming and stabilizing the dried particles.

Ultra-light aggregate having a double foamed cell structure prepared according to the present invention can produce a light block and a light panel by a conventional manufacturing method, a detailed description thereof will be omitted.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples.

Example 1

Sodium silicate anhydrous sodium silicate solution 36% by weight of Na ₂ O.3.5SiO ₂ and 64% by weight of water were added, and the resultant sodium silicate liquid was allowed to stand for 1 hour at a temperature of 180 ° C. and a pressure of 8kgf / cm ² (including insoluble content). 13% by weight of clay was added to 87% by weight and spray-dried in a spray dryer, and the obtained functionalized water was pulverized with a disc type mill to produce functional water of up to 200 mesh, and the water content of the prepared powder was 28% by weight. It was. 5% by weight of cement and 5% by weight of boric acid were added to the total weight of the functionalized water powder thus prepared, and then granulated in a pan coater to a size of 0.1 to 1 mm, and coated with 0.1% by weight of cement at the end of the granulation step. The granulated spheroids were dried until the internal moisture (a loss of ignition at 700 ° C) reached 25% by weight, followed by primary foaming at a temperature of 170 ° C and a second foaming at a temperature of 270 ° C in the foam section of the rotary kiln. By stabilizing at a temperature of 610 ℃ in the heat treatment section was prepared an ultralight aggregate of 0.2 to 2mm having a double foam cell structure.

The manufactured ultra-light aggregates have water / cement ratio (W / C) of 50 and ultra-light aggregates: cement: washing company: water volume ratio of 47.5: 17.5: 7.5: 27.5 Was measured.

In order to check the water resistance of the manufactured ultra-light aggregate, the polystyrene 1ℓ sealed container was filled with the ultra-light aggregate and prevented from falling out of the ultra-light aggregate that floated in water. Stored in the place to be kept. After 30 days from the date of sealing, the filtrate except the ultra-light aggregate was removed from the suspended solids and sediment, and then diluted with ultrapure water if necessary, followed by ICP-MS analysis.

Example 2

Anhydrous sodium silicate was added to 36% by weight of Na ₂ O.3.5SiO ₂ and 64% by weight of water, followed by standing for 1 hour at a temperature of 180 ° C. and a pressure of 8kgf / cm ^2. 50% by weight of sodium silicate liquid and boric acid. A slurry is prepared by wet grinding by mixing 25% by weight of powder and 25% by weight of cement. 70% by weight of the sodium silicate liquid and 10% by weight of clay and 20% by weight of the slurry prepared in the step were mixed to make a functional water glass and maintained at 70 ° C. using a continuous heater. The functional water glass maintained at 70 ° C. was spherical functional water particles having a water content of 25 wt% and a particle size of 0.1 to 1 mm using a nozzle type spray dryer. The functional functional water particles prepared above were first foamed at a temperature of 170 ° C. in a rotary section of a rotary kiln, and secondly foamed at a temperature of 270 ° C., and then stabilized at a temperature of 610 ° C. in a heat treatment section. To prepare an ultra-light aggregate of 2mm.

The manufactured ultra-light aggregates have water / cement ratio (W / C) of 50 and ultra-light aggregates: cement: washing company: water volume ratio of 47.5: 17.5: 7.5: 27.5 Was measured.

In order to check the water resistance of the manufactured ultra-light aggregate, the polystyrene 1ℓ sealed container was filled with the ultra-light aggregate and prevented from falling out of the ultra-light aggregate that floated in water. Stored in the place to be kept. After 30 days from the date of sealing, the filtrate except the ultra-light aggregate was removed from the suspended solids and sediment, and then diluted with ultrapure water if necessary, followed by ICP-MS analysis.

Example 3

The ultra-light aggregate prepared by the method of Example 1 was impregnated at 80 ℃ in the functional water adjusted to 35% by weight of the internal moisture to coat the functionalized water on the surface of the ultra-light aggregate, then 1 hour in a dryer maintained at 50 ℃ After drying, put into a 200 x 100 x 50 mm mold was heat-treated at 610 ℃ 20 minutes to prepare a block.

Comparative Example 1

Except that the content of clay in Example 1 0% by weight, the composition and the manufacturing process were the same.

Comparative Example 2

Except for the content of clay in Example 1 30% by weight, the composition and the manufacturing process were the same.

Comparative Example 3

In Example 1, the composition and manufacturing process were the same except that the cement is 0% by weight and boric acid is 0% by weight.

[Comparative Example 4]

Except for the boric acid 1.5% by weight in Example 1, the composition and production process were the same.

Table 1 shows the measurement results of the properties of the ultralight aggregate and the light concrete according to the above Examples and Comparative Examples. In addition, the results of the dissolution test through ICP-MS of the ultra-light aggregates according to the above examples and comparative examples are shown in Table 2.

Table 1

TABLE 2

As shown in Table 1, the ultra-light aggregate having the double foamed cell structure according to the present invention has a low absorption rate and is not only ultra-light, but also has a very high compressive strength when manufactured from concrete and blocks, and clay is added. In the case of Comparative Example 1, which is not the case, the density of the ultralight aggregate is too low and the compressive strength characteristics are deteriorated, and the light weight aggregate of Comparative Example 1 has a problem of breaking when mixed with concrete, thereby increasing the density of lightweight concrete. In the case of Comparative Example 2 in which the amount of clay was added at 30% by weight, the compressive strength was satisfactory, but there was a problem in that the absorption rate and density were increased.In the case of Comparative Example 3 without adding cement and boric acid, the absorption rate decreased and the compressive strength characteristics Appeared to fall. On the other hand, the ultra-light aggregate prepared by the method of Example 1 was impregnated in the functional water to coat the functional water on the surface of the ultra-light aggregate and then heated to produce a good board and brick in the form of Example 3 by another method Although the compressive strength is lower than that of the manufactured lightweight aggregate, it is useful as a heat insulating material for building, which requires no strength because it has only about 50% in density.

In addition, as a result of ICP-MS analysis, Examples 1, 2, Comparative Example 1, and Comparative Example 2 were measured that the addition amount of boric acid was 5% by weight, and the elution amount did not exceed 0.8 ppm in case of 0.5 ppm silicon in sodium. In Example 3, 712 ppm of sodium was dissolved and 1053 ppm of silicon was eluted. In Comparative Example 4, 102 ppm of sodium and 160 ppm of silicon were eluted. Comparative Examples 3 and 4, in which the content of boric acid in the components of the ultra-light aggregates are small, are insoluble in water, and thus, are weak in weathering and are not suitable for use as building materials.

Ultralight aggregate having a double foamed cell produced by the production method according to the present invention has the advantages of very light and excellent compressive strength and water absorption is very low, such as washing sand, good water resistance and chemical resistance, in particular double By having a foamed cell structure, the performance of thermal conductivity and strength is greatly improved.

1. Scanning electron microscope cross section of an ultralight aggregate with double foamed cells.

Claims (8)

a) Sodium silicate liquid with a water content of 55 to 70% by weight nSiO ₂ Na ₂ 0xH ₂ O (n is 3 to 4) 75 to 95% by weight, 5 to 25% clay, waste concrete powder or Preparing a functional water glass by adding one or two or more mixtures selected from functional ceramic powders; b) drying the prepared functional water glass to produce functional water and pulverizing the functional water; c) 3 to 12% by weight of one or two or more mixtures selected from calcium oxide, calcium hydroxide or cement and one or two or more mixtures selected from boron oxide, boric acid or borax powder on the basis of ground functionalized water Assembling the weight percent with pulverized functional water; d) A method of manufacturing artificial lightweight aggregate, characterized in that the step of foaming and stabilizing the dried particles. a) sodium silicate liquid with a water content of 55 to 70% by weight nSiO ₂ Na ₂ 0xH ₂ O (n is 3 to 4) 40 to 60% by weight, powder or two selected from boron oxide, boric acid or borax Preparing a slurry by mixing 20-30 wt% of the powder mixture selected from 20 wt% to 30 wt%, calcium oxide, calcium hydroxide or cement, or 20 wt% to 30 wt% of a mixture of two or more powders; b) a powder selected from clay, waste concrete powder or functional ceramic powder with a water content of 55 to 70% by weight and sodium silicate liquid nSiO ₂ Na ₂ O x H ₂ O (n is 3 to 4) 65 to 85% by weight or 5 to 30% by weight of the two or more powder mixtures and 10 to 30% by weight of the slurry prepared in step a) to prepare functionalized water; c) drying the prepared functional water glass to produce fire water particles; d) A method of manufacturing artificial lightweight aggregate, characterized in that the step of foaming and stabilizing the dried granulated water particles. The method according to claim 1 or 2, Sodium silicate liquid is a method for producing artificial lightweight aggregate, characterized in that the production of anhydrous sodium silicate ultra-thin collet Na ₂ O.nSiO ₂ (n is 3 to 4) at high temperature and high pressure. The method according to claim 1 or 2, The functional ceramic powder is titanium dioxide, silver oxide, iron oxide, copper oxide, barium carbonate, aluminum oxide, yttrium oxide, cordierite, lanthanum oxide, cerium oxide, or a mixture of two or more thereof. . The method according to claim 1 or 2, Drying the functional water glass is sprayed in the atomizer of the spray dryer in the state of maintaining the viscosity of the functional water glass at 50 to 90 ℃ and dried at 150 to 250 ℃ characterized in that the moisture content is dried to 22 to 34% by weight Method of manufacturing artificial lightweight aggregate. The method according to claim 1 or 2, Foaming and stabilizing step is a method of manufacturing artificial lightweight aggregate, characterized in that the first foaming at 120 to 180 ℃ in the foam section of the rotary kiln and then second foaming at 220 to 300 ℃ and stabilized at 550 to 700 ℃. The artificial lightweight aggregate characterized in that it has a double foamed cell structure, characterized in that produced according to any one of claims 1 or 2. Lightweight block or lightweight panel manufactured using artificial lightweight aggregate prepared according to claim 1.