KR101789990B1 - Soil paving composition - Google Patents

Abstract

The present invention relates to a composition for soil pavement using a red mud liquid slurry in which red mud which is an industrial by-product obtained by producing alumina in bauxite is dispersed in water without a pretreatment such as drying and a method for producing the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a SOIL PAVING COMPOSITION,

The present invention relates to a soil paving composition using red mud liquid slurry in which red mud which is an industrial by-product obtained by producing alumina in bauxite is dispersed in water without a pretreatment such as drying.

Red mud is an industrial by-product generated in the process of producing aluminum hydroxide (Al (OH) ₃ ) and aluminum oxide (Al ₂ O ₃ ) from bauxite raw mineral. In Korea, aluminum hydroxide is extracted by the Bayer method, that is, by extracting aluminum hydroxide by adding sodium hydroxide to a raw mineral having a large amount of alumina, and the remaining sludge is called a red mud. And is discharged in a high viscosity sludge state having a water content of usually about 30 to 50 wt%.

Most red mud chemical composition is SiO ₂ , Al ₂ O _3, and Fe ₂ O ₃ , and red ocher similar to yellow ocher is expressed due to Fe ₂ O ₃ , and is commonly referred to as red mud. And about 10.0% of Na ₂ O which acts as a cause of white pigmentation. This is because sodium hydroxide (NaOH) is used as an extract in the process of extracting aluminum from the ore of bauxite, so that the unrecovered sodium hydroxide solution is present in a large amount in the residue redmud. As a result, the pH of the redmud is 11.0 .

Red mud is sludge-forming all over the world at an annual output of 120 million tons and dry powder at more than 40 million tons, and the amount is increasing every year. Domestic sludge red mud is emitted at an annual output of 200,000 tons, but there is no way to treat red mud itself, so it is not only limited to building materials, but also there is no fundamental treatment. Especially, the place of loading red mud around the world is not enough, and leaking water leaks cause environmental problems such as damage to nearby crops and human life. Therefore, the treatment of red mud sludge is urgent, and research for reducing the whitening phenomenon occurring when applying to construction materials is urgent.

It is intended to provide a composition for soil pavement which is capable of exhibiting a beautiful color similar to that of loess without the use of yellow loam and which can provide a liquid composition rather than a powder, . More specifically, it is intended to provide a composition for soil pavement using a red mud liquid slurry in which red mud obtained as an industrial by-product is dispersed in water in a watery state without a separate drying process.

The present invention also provides a composition for soil pavement improved in whitening according to red mud after soil pavement construction, and a method of manufacturing the same.

The present invention also provides a composition for soil pavement which is excellent in compressive strength and is free from loss or damage due to rainwater or the like, and a method for producing the same.

In order to achieve the above object, the present invention relates to a soil paving composition comprising a red mud liquid slurry, coconut oil, an aggregate and a binder.

The present invention does not use red mud sludge as a powder and does not use a red mud sludge in a functional state, so that a drying step is not necessary and manufacturing cost can be reduced. In addition, by improving long-term dispersion stability, red mud can be used without any problem of sinking during manufacturing process, and it is possible to predict the content of red mud present in the solid content of liquid by providing liquid sludge It is possible to quantitatively use the composition for soil pavement when it is mixed with the composition for soil pavement.

In addition, it is possible to provide a composition for soil pavement which is further improved in dispersion stability and long-term storage property.

Further, the present invention can provide a soil paving composition having a short construction time and excellent compressive strength.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described more fully hereinafter with reference to the accompanying drawings, It should be understood, however, that the invention is not limited thereto and that various changes and modifications may be made without departing from the spirit and scope of the invention.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention is merely intended to effectively describe a specific embodiment and is not intended to limit the invention.

Also, the singular forms as used in the specification and the appended claims are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The inventors of the present invention have conducted research to provide a soil pavement composition using red mud sludge discharged as an industrial by-product without drying and to provide a composition for soil pavement in which the whitening phenomenon of red mud is reduced. As a result, Sludge can be homogenized in water using a homogenizer or an inline mixer, and then mixed with coconut oil, thereby completing the present invention.

Further, it has been found that, by further including alpha-type hemihydrate gypsum together with red mud liquid slurry and coconut oil, the construction time is shortened, the compressive strength is further improved, and the whitening phenomenon reduction effect is further excellent, Respectively.

One aspect of the present invention is a soil paving composition comprising a red mud liquid slurry, coconut oil, aggregate and binder.

In one aspect of the present invention, the soil paving composition may further comprise alpha type hemihydrate gypsum.

In one embodiment of the present invention, the Redmud liquid slurry is an industrial by-product Redmud sludge dispersed in water using a homogenizer or an inline mixer without drying, having a viscosity of 1,000 to 8,000 cps measured at 25 ° C , And the number of sedimentation beds according to the following formula 1 may be 10% or less.

[Formula 1]

Settling index = [100 - (volume of supernatant after n days of precipitation / volume of initial red mud liquid slurry)] x 100

(In the above formula 1, n is selected from 7 to 28.)

In one embodiment of the present invention, the Redmud liquid slurry is prepared by mixing 20 to 100 parts by weight of water, 0.01 to 5 parts by weight of stabilizer and 0.01 to 5 parts by weight of defoamer with respect to 100 parts by weight of Redmud sludge having a water content of 30 to 50% May include.

In one embodiment of the present invention, the Redmud liquid slurry may further comprise 5 to 30 parts by weight of a dispersant relative to 100 parts by weight of Redmud sludge.

In one embodiment of the present invention, the red mud liquid slurry may have a water content of 50 to 90% by weight.

In one embodiment of the present invention, the stabilizer may be a water-dispersible polyurethane-based compound.

In one embodiment of the present invention, the defoaming agent may be any one or two or more nonionic surfactants selected from polyoxyethylene alkyl ethers, fatty acid sorbitan esters, fatty acid diethanolamines, and alkyl monoglyceryl ethers.

In one embodiment of the present invention, the dispersant may be any one or a mixture of two or more selected from the group consisting of a polycarboxylic acid-based dispersant, a lignin sulfonate-based dispersant, a polynaphthalene sulfonate-based dispersant, and a polymelamine sulfonate- have.

In one aspect of the present invention, the coconut oil may comprise a heavy fatty acid.

In one aspect of the present invention, the heavy fatty acid may be one comprising lauric acid.

In one embodiment of the present invention, the coconut oil comprises 30 to 70% by weight of lauric acid, 10 to 30% by weight of myristic acid, 5 to 15% by weight of palmitic acid, 1 to 10% by weight of stearic acid, 5 to 15% by weight of oleic acid and 1 to 10% by weight of linoleic acid.

In one embodiment of the present invention, 1 to 60 parts by weight of the red mud liquid slurry and 0.1 to 50 parts by weight of coconut oil may be added to 100 parts by weight of the sum of the aggregate and the binder.

Hereinafter, each configuration of the present invention will be described in more detail.

(1) Red Mud liquid slurry

The present invention is characterized in that a liquid slurry dispersed in water is used in order to prevent unnecessary waste of energy in the process of drying red mud sludge obtained as an industrial by-product and making it into powder. In this case, when dispersing in water using a general mixer, the dispersion stability is low and the red mud layer and the water layer are separated within one hour due to the strong cohesive force of the red mud. However, when using a homogenizer or an inline mixer , It is confirmed that the dispersion stability is maintained even after 7 days or more and more specifically from 7 days to 28 days. In this case, by adding homogenizing agents such as stabilizers and antifoaming agents, .

In the present invention, the long-term dispersion stability was evaluated by determining the degree of separation of red mud and water in a state where the red mud sludge was homogenized in water to prepare a liquid slurry and maintained for a predetermined period of time, .

[Formula 1]

Settling index = [100 - (volume of supernatant after n days of precipitation / volume of initial red mud liquid slurry)] x 100

(In the above formula 1, n is selected from 7 to 28.)

More specifically, a homogenized red mud slurry was prepared using a homogenizer or an inline mixer, filled into a 500 ml cylinder, maintained in a sealed state for 7 to 28 days, preferably for 14 days, And water level were observed.

The volume of the initial red mud liquid slurry in the formula 1 is the volume of the liquid slurry filled in a 500 ml cylinder after homogenization and the volume of the supernatant after the n days of precipitation is maintained for 7 to 28 days so that the red mud sinks, . More specifically, it may be the volume of the upper water layer after the red mud sinks after being maintained for 14 days.

In the present invention, the long-term dispersion stability can be excellent in the range of the settling water count of 10% or less. When the settling water count exceeds 10%, the red mud is separated from the water and separated from the water. So that additional dispersion process is required and energy and time may be consumed.

As a result of the studies conducted by the present inventors, it was confirmed that the long-term dispersion stability was excellent in the range that the viscosity of the red mud liquid slurry measured at 25 ° C was 1,000 to 8,000 cps and the number of precipitates was 10% or less.

It was further confirmed that the long-term dispersion stability was even better in the range of viscosity measured at 25 ° C. of 3,000 to 8,000 cps and at the same time satisfying the physical properties of 10% or less of the precipitate.

The first aspect of the red mud liquid slurry of the present invention for satisfying the above viscosity and precipitation index is characterized by comprising 10 to 80 parts by weight of water, 0.01 to 5 parts by weight of stabilizer And 0.01 to 5 parts by weight of an antifoaming agent.

The second embodiment of the red mud liquid slurry of the present invention is characterized by comprising 10 to 80 parts by weight of water, 0.01 to 5 parts by weight of stabilizer, 0.01 to 5 parts by weight of defoamer, and 0.01 to 5 parts by weight of a stabilizer, based on 100 parts by weight of Red Mud sludge having a water content of 30 to 50% And 5 to 30 parts by weight of a dispersant.

In one embodiment of the red mud liquid slurry of the present invention, the red mud sludge is an industrial by-product generated in the process of producing aluminum hydroxide (Al (OH) ₃ ) and aluminum oxide (Al ₂ O ₃ ) It is a sticky substance with an obtained water content of 30 to 50% by weight and is used without any pretreatment such as drying. For the chemical composition, SiO ₂ , Al ₂ O ₃ And Fe ₂ O ₃ is accounted for about 80%, and double red mud can be Fe ₂ O _3, which appears as earth colors are accounted for 21% ~ 23%, the content may vary depending on the manufacturer.

In one embodiment of the red mud liquid slurry of the present invention, 10 to 80 parts by weight, more preferably 25 to 60 parts by weight, of water may be used per 100 parts by weight of red mud sludge having a water content of 30 to 50% by weight, Homogenization can be achieved using a homogenizer or an inline mixer in the range, and the viscosity and precipitation index can be satisfied. At this time, it is more preferable to add water in a range that the water content in the redmud liquid slurry is 50 to 90% by weight, more preferably 60 to 70% by weight. When the content of water increases, the long-term dispersion stability may be deteriorated.

In one embodiment of the red mud liquid slurry of the present invention, when water is added to the red mud sludge and homogenized with a homogenizer or an inline mixer, a small amount of bubbles may be generated, preventing such bubbles from being generated, 0.01 to 5 parts by weight, more preferably 0.1 to 3 parts by weight, of a defoaming agent may be added. The antifoaming agent may be, but is not limited to, a nonionic surfactant. Non-ionic surfactants are hydrophilic, non-ionizable hydrophilic moieties, such as low molecular weight polymers such as alkyl glycols or high molecular weight polymers such as polyethylene glycol and polyvinyl alcohol, polyoxyethylene alkyl ether fatty acid sorbitan esters, fatty acid diethanolamines , Alkyl monoglyceryl ether, and the like can be used singly or in combination of two or more.

In one embodiment of the red mud liquid slurry of the present invention, when only water is added and dispersed in a homogenizer or an inline mixer, long-term dispersion stability can not be achieved. Therefore, in order to improve long-term dispersion stability, May be added in portions. And more preferably 0.1 to 3 parts by weight. The stabilizer is not limited, but long-term dispersion stability can be further improved by using any one or a mixture of two or more selected from a water-dispersible polyurethane-based compound, a cellulose ether-based compound and the like. More preferably, by using a water-dispersible polyurethane-based compound, the long-term dispersion stability can be further improved by 20% or more.

The water-dispersible polyurethane-based compound means water-dispersible polyurethane, and is not limited as long as it is emulsified in water or fully or partially soluble in water. Commercial examples include HIRESOL series manufactured by HANKUCK LATICES, Rheovis PU series, and the like, but the present invention is not limited thereto.

The cellulose ether compound may be selected from the group consisting of methylcellulose, ethylcellulose, hydroxymethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, carboxyethylcellulose, hydroxypropylcellulose, polysaccharide water-soluble polymers, But is not limited thereto.

In one embodiment of the red mud liquid slurry of the present invention, the use of a dispersant together with the above stabilizer is preferable because the number of sedimentation sites is further lowered. As the dispersing agent, any one or a mixture of two or more selected from the group consisting of a polycarboxylic acid-based dispersant, a lignin sulfonate-based dispersant, a polynaphthalene sulfonate-based dispersant, and a polymelamine sulfonate-based dispersant may be used. Even more preferably, when the polycarboxylic acid-based dispersant is mixed and used, the number of the precipitating paper can be further lowered, and the effect of further improving the long-term dispersion stability can be achieved.

Next, a method for producing the red mud liquid slurry of the present invention will be described in detail. Water, a stabilizer and a defoaming agent are added to red mud sludge having a water content of 30 to 50 wt% as an industrial byproduct, And homogenously dispersing it using a mixer. Further, if necessary, a dispersant may be further added.

The homogenizer or inline mixer can be used without limitation as long as it is commonly used and may be homogenized with agitation for 3 to 30 minutes at 4000 to 5000 rpm although the rotation speed is not limited. But are not limited thereto.

In one embodiment of the present invention, the soil paving composition is not limited in its content, but it is preferable that the composition contains 1 to 60 parts by weight, more preferably 10 to 50 parts by weight, of the red mud liquid slurry with respect to 100 parts by weight of the aggregate and the sum of the binders Lt; / RTI > The content of the red mud liquid slurry within the above range is preferable because the storage stability of the composition is excellent, the whiteness can be reduced and the soil can be packed with a beautiful earthy color.

(2) Coconut oil

The present invention is characterized by providing a composition in which the whitening phenomenon is reduced by mixing the red mud liquid slurry and the coconut oil.

Specifically, coconut oil may include coconut oil produced in coconut pulp. Such coconut oil is a coconut oil capable of forming a strong waterproof coating while having high stability at room temperature. It is a coconut oil which is produced from a medium fatty acid such as lauric acid (12 carbon atoms) or myristic acid (14 carbon atoms) It is preferable to include the coconut oil constituted.

More specifically, the coconut oil is preferably composed of heavy fatty acid. The fatty acids in the medium are hydrophilic and can be mixed well with water. Therefore, it is possible to provide a composition having improved miscibility with the red mud liquid slurry and having excellent dispersion stability.

In one embodiment of the invention, the coconut oil is selected from the group consisting of lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid and linoleic acid. acid, more specifically 30 to 70% by weight of lauric acid, 10 to 30% by weight of myristic acid, 5 to 15% by weight of palmitic acid, 1 to 15% by weight of stearic acid 1 To 10% by weight of oleic acid, 5 to 15% by weight of oleic acid, and 1 to 10% by weight of linoleic acid. It is possible to provide the soil packaging composition having an excellent miscibility with the redmud liquid slurry in the range satisfying the above content range and having excellent long-term dispersion stability, but is not limited thereto.

The coconut oil may be at least one of extra virgin coconut oil, virgin coconut oil and refined coconut oil.

In one embodiment of the present invention, the soil paving composition is not limited in its content but may include 0.1 to 50 parts by weight, more preferably 1 to 30 parts by weight, of coconut oil per 100 parts by weight of the sum of aggregate and binder have. The content of the coconut oil is preferably within the above range because the composition is excellent in storage stability, can reduce the whiteness and can coat the soil with a beautiful earthy color, but is not limited thereto.

(3) aggregate

In one embodiment of the present invention, the aggregate can be used without limitation as long as it is an aggregate conventionally used in soil packing. Specifically, for example, the fine aggregate may be classified into a coarse aggregate and a fine aggregate depending on the particle size. Typically, the fine aggregate is selected from the group consisting of marine clay, lecturer, silica sand, crushed sand, crushed gravel, marble, slag aggregate, waste concrete recycled aggregate, May be used alone or in a mixture of two or more. The coarse aggregate may be a clavicle, a coarse aggregate, a coarse aggregate, or the like, and may be used singly or in a mixture of two or more.

(4) Binders

In one aspect of the present invention, the binding material can be used without limitation as long as it is conventionally used in soil packaging. Specifically, for example, ordinary Portland cement, mixed cement, hardened steel cement, special cement, polymer cement, soil hardening agent and the like can be used, and they can be used singly or in combination of two or more.

In one embodiment of the present invention, the content of the aggregate and the binder is not limited, but the aggregate: binder may be 10 to 90: 90 to 10, more specifically 30 to 70: 70 to 30, But is not limited to.

(5) Alpha type semi-plaster

In one aspect of the present invention, the alpha-hemihydrate gypsum is produced by heating an alumite sol at a temperature of 75 to 150 DEG C for 1 hour or more under reduced pressure. Alpha-hemihydrate gypsum is produced by reduced- When the composition is mixed with the composition for soil pavement of the present invention, it is possible to further shorten the working time and shorten the construction time at the time of application and packaging, to further improve the compressive strength, to further improve the compressive strength ratio after freezing and thawing, And further reduced.

The content of the alpha-hemihydrate gypsum is not limited, but may be 0.1 to 30 parts by weight, more preferably 1 to 20 parts by weight, based on 100 parts by weight of the sum of the aggregate and the binder. But is not limited thereto since it is sufficient to further reduce the whitening phenomenon and the strength in the above range.

(6) Other additives

In one embodiment of the present invention, the soil paving composition may contain, if necessary, fumed silica, blast furnace slag, Bottom ash, fly ash, fly ash, zeolite, titanium dioxide, dolomite, Silica, calcium carbonate, glass beads, fibers, and the like. Particularly, when bottom ash (bottom ash) and fly ash (fly ash) are added, it is preferable because it can provide a soil pack having better strength.

Further, in one embodiment of the present invention, the soil paving composition may further comprise water, and the content of water may be changed depending on the state of the road surface to be constructed.

In one aspect of the present invention, the pavement surface to which the soil packaging composition can be applied is selected from the group consisting of pedestrian walkways, sidewalks, bicycle roads and trails, vehicle corridors and parking lots, mechanized tillage for mechanized farming, It can be applied on the basis of the sub-base or surface layer, such as entrance roads and trails of temples and cultural sites, sites for ecological park construction and viewing, ground surface of school playgrounds, or foundation of physical education facilities.

Hereinafter, the present invention will be described in more detail based on examples and comparative examples. However, the following examples and comparative examples are merely examples for explaining the present invention in more detail, and the present invention is not limited by the following examples and comparative examples.

1. Viscosity

The red mud liquid slurry was prepared at 25 DEG C, and then the spindle was mounted on the Brookfield viscometer (DV1MRVTJO) four times and the viscosity was measured at 10 rpm.

2. Precipitation index

In order to evaluate the long-term dispersion stability, the prepared redmud liquid slurry was filled in a 500 ml cylinder, and the upper portion was sealed. The mixture was allowed to stand at room temperature for 14 days to observe the separation of the red mud layer and the water layer. After 14 days, the volume of the water layer as the supernatant was measured and the precipitation index was calculated according to the following equation (1).

[Formula 1]

Settling index = [100 - (volume of supernatant after 14 days of precipitation / volume of initial red mud liquid slurry)] x 100

3. Compressive strength

The compressive strength at 28 days was measured according to KS F 2328. The unit is MPa.

4. Flexural strength

The bending strength at 28 days was measured according to KS F 2406. The unit is MPa.

5. Compressive strength ratio after freezing and thawing

The compression strength ratio after 100 cycles according to KS F 2459 was measured. The unit is%.

6. Evaluation of bleaching phenomenon

The specimens were demolded after curing for 1 day at 20 ° C and 80% humidity, and then dried at 80 ° C for 1 day. The side of the specimen was sealed with paraffin, immersed in distilled water, and cured for 14 days at 7 ° C and 50% humidity. Then, after drying for one day at 80 ° C, the presence or absence of whitening was visually confirmed.

The red mud sludge used in the examples and comparative examples was generated from KC Co., Ltd. located in Daebul Industrial Complex, Yeongam-gun, Chonnam, and the composition table thereof is shown in Table 1 below. The water content was 50% by weight and the pH was 11.

ingredient Content (wt%) SiO ₂ 38.8 Al ₂ O ₃ 16.1 Fe ₂ O ₃ 22.8 Na ₂ O 10.0 CaO 3.4 Other 8.9

[Production Example 1]

20 parts by weight of water, 0.2 part by weight of HANKUCK LATICES HIRESOL 180, and 0.3 part by weight of KPX NEORIN-430 as a defoaming agent were added to 100 parts by weight of Red Mud sludge shown in Table 1 using a homogenizer And homogenized by stirring at 4000 rpm for 10 minutes.

The viscosity of the prepared red mud liquid slurry was 8000 cps and the precipitation index was 0.7.

[Production Example 2]

To 100 parts by weight of Red Mud sludge shown in Table 1, 50 parts by weight of water, 0.4 part by weight of HIRESOL 180 manufactured by HANKUCK LATICES, 0.2 part by weight of KPX NEORIN-430 as a defoaming agent, 0.2 parts by weight of an ester dispersant (KG Chemicals, -500) was used and homogenized by homogenizer at 4000 rpm for 10 minutes with stirring.

The viscosity of the prepared red mud liquid slurry was 2500 cps and the precipitation index was 7.5.

[Example 1]

20 weight% of coarse aggregate (10 mm to 25 mm), 20 weight% of portland cement (Sung Shin Cement Co., Ltd., Portland litter) and 10 weight% of fly ash were mixed, , 10 parts by weight of stearic acid, 5 parts by weight of oleic acid and 5 parts by weight of linoleic acid), 10 parts by weight of coconut oil (50 parts by weight of lauric acid, 20 parts by weight of myristic acid, 10 parts by weight of palmitic acid, And 50 parts by weight of mixed water were mixed.

In order to evaluate the physical properties, it was poured into a mold, and then pressed with a press molding machine to produce a specimen having a thickness of 10 cm.

The physical properties of the prepared specimens were measured and are shown in Table 2 below.

[Example 2]

In Example 1, a specimen was prepared in the same manner as in Example 1 except that the redmud liquid slurry of Production Example 2 was used, and physical properties were measured.

[Example 3]

In Example 1, a specimen was prepared in the same manner as in Example 1 except that 5 parts by weight of alpha type hemihydrate was further added, and physical properties were measured.

[Comparative Example 1]

In Example 1, specimens were prepared in the same manner as in Example 1 except that coconut oil was not used, and physical properties were measured.

Compressive strength
(MPa) Flexural strength
(MPa) Compressive strength ratio after freeze-thaw (%) Bleaching Example 1 25.7 3.9 88.5 none Example 2 29.2 4.3 90.8 none Example 3 35.2 6.2 95.2 none Comparative Example 1 22.3 3.4 87.4 has exist

Claims (13)

A red mud liquid slurry, coconut oil, aggregate and binder material containing 20 to 100 parts by weight of water, 0.01 to 5 parts by weight of a stabilizer and 0.01 to 5 parts by weight of an antifoaming agent based on 100 parts by weight of Red Mud sludge having a water content of 30 to 50% By weight. The method according to claim 1,
Wherein the composition for soil packing further comprises alpha-type hemihydrate gypsum. The method according to claim 1,
The red mud liquid slurry is an industrial by-product red mud sludge which is dispersed in water using a homogenizer or an inline mixer without a drying process. The viscosity of the red mud sludge is 1,000 to 8,000 cps measured at 25 ° C, Wherein the water content is 10% or less.
[Formula 1]
Settling index = [100 - (volume of supernatant after n days of precipitation / volume of initial red mud liquid slurry)] x 100
(In the above formula 1, n is selected from 7 to 28.) delete The method according to claim 1,
Wherein the redmud liquid slurry further comprises 5 to 30 parts by weight of a dispersant based on 100 parts by weight of red mud sludge. The method according to claim 1,
The red mud liquid slurry has a moisture content of 50 to 90 wt%. The method according to claim 1,
Wherein the stabilizer is a water-dispersible polyurethane-based compound. The method according to claim 1,
Wherein the antifoaming agent is any one or two or more nonionic surfactants selected from polyoxyethylene alkyl ethers, fatty acid sorbitan esters, fatty acid diethanolamines, and alkyl monoglyceryl ethers. 6. The method of claim 5,
Wherein the dispersant is any one or a mixture of two or more selected from the group consisting of a polycarboxylic acid-based dispersant, a lignin sulfonate-based dispersant, a polynaphthalene sulfonate-based dispersant, and a polymelamine sulfonate-based dispersant. The method according to claim 1,
Wherein the coconut oil comprises a heavy fatty acid. 11. The method of claim 10,
Wherein the heavy chain fatty acid comprises lauric acid. 11. The method of claim 10,
Wherein the coconut oil comprises 30 to 70% by weight of lauric acid, 10 to 30% by weight of myristic acid, 5 to 15% by weight of palmitic acid, 1 to 15% by weight of stearic acid 1 To 10 wt%, oleic acid (5 to 15 wt%), and linoleic acid (1 to 10 wt%). The method according to claim 1,
1 to 60 parts by weight of a redmud liquid slurry, and 0.1 to 50 parts by weight of coconut oil, based on 100 parts by weight of the sum of aggregate and binder.