KR20180110416A - Manufacturing method of alkali actived hardened material using sedimentation sludge - Google Patents

Abstract

Disclosed is a method for producing an alkali active cured body using precipitated sludge. According to an embodiment of the present invention, the method for producing the alkali active cured body comprises the following steps: preparing precipitated sludge comprising a calcium compound and a magnesium compound; mixing blast furnace slag, the precipitated sludge, and an alkali activator to produce a mixture; and molding and curing the mixture.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for producing an alkali activated cured body using precipitated sludge,

TECHNICAL FIELD The present invention relates to a method for producing an alkali activated cured body using precipitated sludge.

The main chemical composition of the blast furnace slag is about 97% of the four components of SiO ₂ , Al ₂ O ₃ , CaO and MgO derived from gangue of iron ore, coke ash and limestone, and calcium of CaO and MgO as base Aluminosilicates.

 Portland cement clinker minerals react with water to cure by hydration reaction. Blast furnace slag does not exhibit hydraulic properties even when brought into contact with water, but exhibits remarkable hydraulicity when a small amount of calcium hydroxide is present as an alkali stimulant. This phenomenon is called latent hydraulicity.

The alkali stimulant is an indispensable additive to the hydration reaction of the blast furnace slag, but only the necessary amount to cause the hydration reaction. The subsequent hydration reaction proceeds continuously because the blast furnace slag itself is supplied with the necessary materials.

 Blast furnace slag has strong latent hydraulic properties because it is calcium aluminosilicate glass as mentioned above.

When 2CaO · Al ₂ O ₃ · SiO ₂ glass similar to that of blast furnace slag is hydrated in a suspension state, a hydrate of Al ₂ O ₃ · SiO ₂ · 6H ₂ O (ASH ₆ ) composition is formed on the surface to a thickness of about 0.2 μm do. This film is poor in transparency and prevents elution from the vitreous. Therefore, the concentration and pH of the liquid phase are lowered, and the hydration reaction does not proceed any more.

However, the addition of stimulants, such as Ca (OH) ₂ and Na (OH), the coating is destroyed by the alkaline pH = 12 degree Si ^{4 +} and Al ^{3 +} ion, in particular due to Al ^{3 +} is ion elution 2CaO · Al The hydration reaction of ₂ O ₃ .SiO ₂ glass proceeds.

On the other hand, since calcium and magnesium present in water cause various problems in various industrial processes and real life, calcium and magnesium are generally removed by using a precipitation method, and the sludge generated afterward is buried through a dehydration process . At present, there is a need for a new treatment method in addition to landfill disposal of sludge due to limited landfill and increasing waste.

Cement, which is a conventional construction material, is the most popular construction material and is used as concrete by mixing fine aggregate with coarse aggregate. It has excellent curing properties, heat resistance and formability and is the most consumed construction material since the invention.

However, in the manufacture of cement, global environmental problems such as deforestation, land degradation, energy consumption, and carbon dioxide emission have been increasing. For this reason, slag, which is a byproduct of the steel industry, has been widely used as a substitute for cement.

However, the use of construction materials using only slag without cement is scarce, due to the high cost of alkali activators and the provision of physico-chemical durability. Therefore, it is necessary to develop a new technique that can improve the physical and chemical durability while lowering the material cost of the alkali activated slag cured product.

Korean Registered Patent No. 10-1025893 (Mar. 23, 2011), "Method of Manufacturing Hardened Body Using Stone Powder Sludge" Korean Patent No. 10-1597441 (Feb. 26, 201), "Artificial Lightweight Aggregate and Method for Manufacturing the Same & Korean Patent No. 10-1683760 (Dec. 01, 2016), "solidifying composition"

An embodiment of the present invention is to provide an alkali activated cured product which is environmentally friendly, economical, and excellent in strength using sedimentation sludge and a method for producing the same.

A method for preparing an alkali activated cured body according to an embodiment of the present invention includes the steps of: preparing a precipitation sludge containing a calcium compound and a magnesium compound; Mixing the blast furnace slag, the precipitation sludge and the alkali activator to produce a mixture; And molding and curing the mixture.

The calcium compound may be CaCO ₃ , and the magnesium compound may be Mg (OH) ₂ .

The precipitated sludge may further contain a sodium compound, a hydroxyl group-containing compound, a carbonate group-containing compound, or a combination thereof.

The mixture may comprise 4 to 20 parts by weight of the precipitated sludge and 15 to 50 parts by weight of the alkali activator based on 100 parts by weight of the blast furnace slag.

The mixture may further comprise fly ash.

The mixture may comprise 1 to 50 parts by weight of the fly ash, 4 to 20 parts by weight of the precipitated sludge and 15 to 50 parts by weight of the alkali activator, based on 100 parts by weight of the blast furnace slag.

The alkali activating agent may be at least one selected from the group consisting of an alkali metal hydroxide, an alkaline earth metal hydroxide, sodium carbonate and sodium silicate.

The alkali activator may have a concentration of 5M to 20M.

Wherein the step of preparing the precipitated sludge comprises the steps of: preparing sludge by adding sodium carbonate and sodium hydroxide to seawater concentrated water; Drying the sludge; And pulverizing the dried sludge to produce precipitated sludge in the form of fine powder.

The step of drying the sludge can be carried out at a temperature of 105 ° C for 1 to 7 days.

Preparing the mixture comprises mixing the blast furnace slag and the settling sludge to produce a first mixture; And mixing the first mixture and the alkali activator to produce a second mixture.

The curing step may be carried out at a temperature of 20 ° C to 40 ° C for 3 to 28 days.

According to the embodiment of the present invention, sediment sludge containing a calcium compound and a magnesium compound and blast furnace slag, which is a byproduct of the steel industry, can be reused for useful value.

According to the embodiment of the present invention, it is possible to produce an alkali activated cured body having enhanced strength by using a precipitation sludge containing a calcium compound and a magnesium compound, and curing the latent hydraulic slag with an alkali activating agent.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method for producing an alkali activated cured body according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method of manufacturing a sedimentation sludge according to an embodiment of the present invention.
3 is a flow chart illustrating a method of preparing a mixture according to an embodiment of the present invention.
4 is a graph showing the compressive strength of the alkali activated cured product with respect to the water content and the aged days of the settled sludge.
5 is a graph showing the compressive strength of the alkali activated cured product with respect to the content of sedimentation sludge and the aged days.

In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention. In addition, the terms described below are terms set in consideration of the functions of the present invention, and these may vary depending on the intention of the manufacturer or custom in the industry, and the definition should be based on the contents throughout the specification.

The alkali activated cured product according to an embodiment of the present invention is characterized in that the cured product is prepared using precipitated sludge, blast furnace slag and alkali activator.

Hereinafter, a method for producing an alkali activated cured body using the precipitation sludge according to an embodiment of the present invention will be described in detail with reference to FIG.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method for producing an alkali activated cured body according to an embodiment of the present invention.

Referring to FIG. 1, a method for producing an alkali activated cured product according to an embodiment of the present invention includes the steps of preparing a precipitated sludge (S110), mixing blast furnace slag, the precipitated sludge and an alkali activator And molding and curing the mixture (S130).

Step S110 produces precipitated sludge.

The precipitated sludge is characterized by containing a calcium compound and a magnesium compound.

The calcium compound may be calcium carbonate (CaCO ₃ ), and the magnesium compound may be magnesium hydroxide (Mg (OH) ₂ ). Specifically, when calcium and magnesium are precipitated from seawater concentrated water or industrial wastewater by using sodium carbonate (Na ₂ CO ₃ ) and sodium hydroxide (NaOH), precipitation sludge containing calcium carbonate and magnesium hydroxide can be obtained.

The precipitated sludge may further contain, in addition to the calcium compound and the magnesium compound, a sodium compound, a compound containing a hydroxyl group (a hydroxyl group containing compound), a compound containing a carbonic acid group (a carbonate group containing compound), or a combination thereof. Further, the precipitated sludge further contains water (H ₂ O) in addition to the above-mentioned compounds, and the above-mentioned compounds may be composed of hydrates.

Precipitation sludge can be obtained from seawater concentrated water or industrial wastewater generated after the seawater desalination process. Calcium and magnesium-enriched seawater concentrate or industrial wastewater can be removed in the form of sediment as it seals the diaphragm and adversely affects industrial equipment. Specifically, sodium carbonate and sodium hydroxide can be used to precipitate calcium and magnesium from seawater concentrated water or industrial wastewater to obtain precipitate sludge in the form of a precipitate, and an alkali activated cured product can be prepared using such precipitate sludge.

By reusing sedimentation sludge, it is possible to create environmental and economic benefits such as treatment of industrial by-products, reduction of required concentration of alkali activator, reduction of blast furnace slag usage, improvement of physical properties of alkali activated cured products, Can play a role.

Precipitation sludge is a strong base above pH 10, which can help to activate the blast furnace slag. Concretely, blast furnace slag has latent hydraulic properties, and unlike cement which is usually hydraulic, strength does not manifest strength by water alone. It is the basic solution that triggers the hydraulic properties of such blast furnace slag. The reason why blast furnace slag and cement are mixed in the existing construction site is that when the cement is mixed with water, the blast furnace slag is strong enough to exhibit sufficient strength.

All of the substances (sodium hydroxide, sodium carbonate) that are added to lower the hardness of the wastewater are strong bases in water. They react with calcium (ions) and magnesium (ions) in the wastewater and the precipitated sludge is also basic. Therefore, sedimentation sludge can have a positive effect on the activation of blast furnace slag. The mechanism of reaction between basic hydroxyl group and blast furnace slag is not clear yet, but the higher the pH is, the more the compressive strength of blast furnace slag is proportional.

FIG. 2 is a flowchart illustrating a method of manufacturing a sedimentation sludge according to an embodiment of the present invention.

Referring to FIG. 2, the step (S110) of producing precipitated sludge includes a step (S111) of producing sludge by adding sodium carbonate and sodium hydroxide to seawater concentrated water, a step (S112) of drying the sludge, And pulverizing the sludge to produce precipitated sludge in the form of fine powder (S113).

In step S111, sodium carbonate and sodium hydroxide are added to the seawater concentrated water to produce sludge.

Specifically, when sodium carbonate and sodium hydroxide are added to seawater concentrated water, calcium and magnesium which are present in seawater concentrated water are precipitated in the form of calcium carbonate and magnesium hydroxide to produce sludge, thereby removing calcium and magnesium from seawater concentrated water can do.

The produced sludge may have a water content of 80% to 90%.

Step S112 is to dry the sludge produced in step S111.

Specifically, the drying of the sludge can be carried out using a drier at a temperature of about 105 DEG C for about 1 to 7 days. When the sludge is dried, it is necessary to mix the inside and the outside of the sludge periodically because the sludge is dried from the surface and the inside may not be dried well. Otherwise, it may take more time to achieve 0% moisture content.

In step S113, the dried sludge is pulverized in step S112 to produce precipitated sludge in the form of fine powder.

Specifically, sludge dried by one-third of the sludge is crushed and crushed. The sludge particle size of the pulverized fine powder form is 0.05 mm to 1.00 mm, which is smaller than sand but larger than wheat flour. Crushing the sludge widens the area of contact with the blast furnace slag and the activator, thereby positively influencing the strength development.

Referring again to FIG. 1, step S120 mixes the blast furnace slag, the precipitation sludge prepared in step S110, and the alkali activator to prepare a mixture.

Specifically, the mixture comprises a settling sludge and an alkali activator comprising a blast furnace slag, a calcium compound and a magnesium compound.

Blast furnace slag is a by-product obtained from iron ore, limestone, coke, etc. as a raw material in a blast furnace of a steel industry. It is a combination of limestone and pumice contained in impurities in iron ore.

The blast furnace slag is a material that can replace calcium hydroxide (CaO), which is a limestone component of conventional Portland cement, and contains a large amount of non-glazed glass phase. This non-hard phase is a latent hydraulic material which easily reacts with an alkaline substance.

In the embodiment of the present invention, the blast furnace slag is used in an amount of 100 parts by weight.

Blast furnace slag is used in the form of fine powder. Here, the fine powder generally means a powder having a degree of powder of 100 [mu] m or less. The blast furnace slag powder is a material which activates hydration reactivity in the presence of an alkaline substance and forms a C-S-H gel through hydration to cure.

The settling sludge comprises a calcium compound and a magnesium compound, and the settled sludge uses the settled sludge produced in step S110.

In the embodiment of the present invention, the precipitation sludge is preferably used in an amount of 4 to 20 parts by weight based on 100 parts by weight of the blast furnace slag. If the amount of the precipitated sludge is less than 4 parts by weight, If it is used in an amount exceeding 20 parts by weight, workability may be lowered due to excessive use, which may adversely affect the production of an alkali active cured product.

According to the embodiment of the present invention, since the amount of the blast furnace slag can be reduced by using the precipitation sludge and a low concentration of the alkali activator can be used, it is possible to reduce the use of existing essential materials and reduce the cost.

The alkali activator reacts with the blast furnace slag to form a new product called aluminosilicate gel. The aluminosilicate gel acts as a binder to bind the particles together or chemically combine them into a single ceramic mass.

In the embodiment of the present invention, the alkali activator is preferably used in an amount of 15 to 50 parts by weight based on 100 parts by weight of the blast furnace slag. When the amount of the alkali activator is less than 15 parts by weight, And if it is used in an amount exceeding 50 parts by weight, the strength of the alkali active cured product may be lowered due to excessive use.

The alkali activating agent can be any substance as long as it reacts with water and is basic, for example, an alkali metal hydroxide, an alkaline earth metal hydroxide, sodium carbonate, sodium silicate, or a mixture thereof.

The alkali activator may have a concentration of 5M to 20M. Specifically, by using the precipitation sludge according to the embodiment of the present invention, it is possible to use a low concentration of alkali activating agent such as the concentration range described above, thereby reducing the use of the alkali activating agent and reducing the cost.

On the other hand, the water-binding ratio 0.3 is an arbitrarily set value. If the water-binding ratio is changed within the above-described range, the curing is performed. The calculation of the water-binding ratio is as follows.

For example, 1500 g of blast furnace slag and an alkali activator were bombarded at a water-binding ratio of 0.3, which means that 450 g of an alkali activator was added.

Step S120 may further comprise mixing the fly ash in addition to the blast furnace slag, the precipitation sludge prepared in step S110, and the alkali activator to prepare a mixture. Specifically, the mixture prepared in step S120 may comprise blast furnace slag, fly ash, precipitated sludge and an alkaline activator.

When fly ash is further contained in the mixture according to the embodiment of the present invention, it is preferable to use fly ash within 50 parts by weight of 100 parts by weight of blast furnace slag. When the amount of fly ash is 50 parts by weight or less, It is possible to strengthen the surface and improve the economical efficiency, and if it is used in an amount exceeding 50 parts by weight, the compressive strength of the cured product may be lowered.

3 is a flow chart illustrating a method of preparing a mixture according to an embodiment of the present invention.

Referring to FIG. 3, the step of preparing a mixture (S120) comprises mixing the blast furnace slag and the settling sludge to produce a first mixture (S121), and mixing the first mixture and the alkali activator to form a second And a step (S122) of preparing the mixture.

Step S121 mixes the blast furnace slag and the settling sludge to produce a first mixture.

Specifically, the precipitation sludge containing the blast furnace slag and the calcium compound and the magnesium compound is first mixed and dry-blended to produce the first mixture.

Step S122 mixes the first mixture and the alkali activator prepared in step S121 to prepare a second mixture.

Specifically, a second mixture, which is the final mixture, is prepared by adding a liquid alkali activator to the first mixture and water non-bombarding.

Referring again to FIG. 1, step S130 molds and cures the mixture prepared in step S120.

Specifically, the mixture prepared in step S120 can be molded into a mold or a pelletizer, and the molded body can be cured for 3 to 28 days at a temperature of about 30 DEG C using a curing machine.

The mold unit proposed in the present invention is a 3-beam mold unit, and it is possible to mold three cured objects of 40 * 40 * 160 mm ³ standard. Fill the half-filled mortar into the beam and place the mold on the vibrating table and operate the vibrating table for 1 minute. At this time, pressure is applied evenly to the mortar inside the mold with the compaction rod. This is to remove the air inside the mortar to reduce the porosity of the hardened body.

According to the embodiment of the present invention, in the alkali activation of the blast furnace slag, which is a byproduct of the steel industry, the precipitation sludge can be used as a substitute for blast furnace slag or an additive instead of being buried, thereby enhancing the environment friendliness and enhancing the strength of the alkali activated cured product Economical efficiency can be obtained.

In addition, according to the embodiment of the present invention, the use of the sedimentation sludge can contribute to extending the period of use of the currently incomplete landfill site, and various sedimentation sludge can be utilized as a construction material as a byproduct rather than waste, thereby being eco-friendly.

In addition, according to the embodiment of the present invention, the alkali activated cured body using the precipitation sludge exhibits higher strength than the alkali activated cured body not using the settled sludge, so that it can enhance the competitiveness as a construction material.

Hereinafter, examples and comparative examples of the present invention will be described. The following examples are merely examples of the present invention and the present invention is not limited to the following examples.

Example  1: Alkali activity Hardened  Produce

(Preparation of Precipitation Sludge)

The seawater concentration water used in the examples is seawater concentrated water discharged from the seawater desalination plant, and the constellation (g / L) is shown in Table 1 below.

Na Cl Mg Ca SO ₄ K HCO ₃ Br 33.087 59.473 3.982 1.257 8.298 1.193 0.438 0.203

12.75 g / L of sodium carbonate (Na ₂ CO ₃ ) and 33.25 g / L of sodium hydroxide (NaOH) were added to seawater concentrated water to precipitate calcium and magnesium in seawater concentrated water to obtain sludge. The water content of the obtained sludge was about 90%. The sludge was placed in a dryer and dried at a temperature of 200 ° C for 3 days. The dried sludge was pulverized to prepare precipitated sludge in the form of fine powder. The water content of the dried sedimentation sludge was about 56%.

(Preparation of mixture)

1400 g of blast furnace slag and 100 g of the above-described sludge were quantified and mixed, followed by drying for 1 minute to prepare a first mixture. Here, blast furnace slag was used in accordance with quality standard KS L 5405 in accordance with two kinds. Then 454.95 g of a 3% sodium hydroxide (NaOH) solution as an alkali activator was added to the first mixture and a water bibamine was applied for 3 minutes to prepare a second mixture.

(Molding and curing of the mixture)

In order to produce an alkali active cured body, a mold is filled with the second mixture in a mold as a mold, and then a vibrating table (using a vibrating compaction unit and a compaction rod) is operated for one minute to reduce the void as much as possible, fill the remaining part, Lt; / RTI > for 1 minute. Then, the entire mold was sealed so as to prevent the water from flying, and the cured product was cured at 30 ° C for 3 days, 7 days, and 28 days.

Example  2 to 4: Precipitation Sludge  Water content change

(Example 2), 8 hours (Example 3) and 4 hours (Example 4) in order to change the water content of the precipitated sludge. The water content of the precipitated sludge in Examples 2 to 4 was 70%, 78%, and 83%, respectively.

The mixture of Examples 1 to 4 was made into a specimen of 40 * 40 * 160 mm ³ and subjected to a compressive strength test. The results are shown in Table 2 below.

Moisture content of sediment sludge (%) Compressive strength (MPa) 3 days 7 days 28th Example 1 56 17.5 19.3 28.2 Example 2 70 13.5 14.7 22.1 Example 3 78 12.9 12.9 20.5 Example 4 83 11.9 11.9 19.3

4 is a graph showing the compressive strength of the alkali activated cured product with respect to the water content and the aged days of the settled sludge.

Referring to FIG. 4, it can be seen that as the water content of the precipitated sludge contained in the alkali activated cured product decreases, the compressive strength increases, and that the compressive strength increases with age, that is, I could. In particular, the alkali activated cured body of Example 1 containing precipitated sludge with a water content of 56% exhibited the highest compressive strength of about 28 MPa on the 28th day.

Example  5 to 10: Precipitation Sludge  Content change

The same procedure as in Example 1 was carried out except that the drying time of the sludge was changed to 7 days so that the water content of the precipitated sludge became 0%.

Further, the amounts of the blast furnace slag, the precipitated sludge and the alkali activator (3% sodium hydroxide (NaOH) solution) were changed as shown in Table 3 below. Here, Examples 5 to 7 mean that the precipitation sludge was used as a partial substitute for blast furnace slag, and Examples 8 to 10 could mean that they were used as additives for the alkali active cured product.

Blast furnace slag (g) Precipitation sludge (g) The alkali activator (g) Example 5 1350 150 454.95 Example 6 1400 100 454.95 Example 7 1450 50 454.95 Example 8 1500 50 454.95 Example 9 1500 100 454.95 Example 10 1500 150 454.95

Comparative Example  1: Precipitation Sludge  Content change

The same procedure as in Example 1 was carried out except that the drying time of the white sludge was changed to 7 days so that the water content of the precipitated sludge was 0%.

In addition, the amounts of the blast furnace slag, the precipitated sludge and the alkali activator (3% sodium hydroxide (NaOH) solution) were changed as shown in Table 4 below. Specifically, 454.95 g of a 3% sodium hydroxide (NaOH) solution as an alkali activator was added to 1500 g of a blast furnace slag and a water bombardment was carried out for 3 minutes to prepare a mixture. Here, blast furnace slag was used in accordance with quality standard KS L 5405 in accordance with two kinds.

Blast furnace slag (g) Precipitation sludge (g) The alkali activator (g) Comparative Example 1 1500 - 454.95

The mixtures of Examples 5 to 10 and Comparative Example 1 were made into specimens of 40 * 40 * 160 mm ³ and subjected to a compressive strength test. The results are shown in Table 5 below.

Compressive strength (MPa) 3 days 7 days 28th Example 5 17.2 32.8 36.1 Example 6 23.3 34 45 Example 7 28.8 36.8 42 Example 8 27.6 35.8 42.9 Example 9 28.8 37.1 43.2 Example 10 19 37.1 43.8 Comparative Example 1 23.3 30.3 34.6

5 is a graph showing the compressive strength of the alkali activated cured product with respect to the content of sedimentation sludge and the aged days.

Here, 3d, 7d and 28d represent the third day, seventh day, and the 28th day, respectively.

Referring to FIG. 5, it can be seen that the higher the content ratio of the settling sludge contained in the alkali activated cured product, the greater the compressive strength, and the higher the compressive strength is, the higher the elapsed days from the start of curing I could. In particular, the alkali active cured product of Example 6, which contained 1400 g of blast furnace slag and 100 g of precipitated sludge, exhibited the highest compressive strength of about 45 MPa at 28 days.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

Claims (12)

Preparing a precipitation sludge comprising a calcium compound and a magnesium compound;
Mixing the blast furnace slag, the precipitation sludge and the alkali activator to produce a mixture; And
Molding and curing the mixture
Wherein the alkali-activated cured product is an alkali-activated cured product.
The method according to claim 1,
Wherein the calcium compound is CaCO ₃ ,
Wherein the magnesium compound is Mg (OH) ₂ .
The method according to claim 1,
Wherein the sedimentation sludge further comprises a sodium compound, a hydroxyl group-containing compound, a carbonate group-containing compound, or a combination thereof.
The method of claim 3,
Wherein the mixture comprises 4 to 20 parts by weight of the precipitated sludge and 15 to 50 parts by weight of the alkali activator based on 100 parts by weight of the blast furnace slag.
5. The method of claim 4,
Wherein the mixture further comprises fly ash. ≪ RTI ID = 0.0 > 11. < / RTI >
6. The method of claim 5,
Wherein the mixture comprises 1 to 50 parts by weight of the fly ash, 4 to 20 parts by weight of the precipitated sludge and 15 to 50 parts by weight of the alkali activator, based on 100 parts by weight of the blast furnace slag A method for producing an alkali active cured product.
The method according to claim 1,
Wherein the alkali activating agent is at least one selected from the group consisting of an alkali metal hydroxide, an alkaline earth metal hydroxide, sodium carbonate and sodium silicate.
8. The method of claim 7,
Wherein the alkali activator has a concentration of 5M to 20M.
The method according to claim 1,
The step of producing the precipitation sludge comprises:
Adding sodium carbonate and sodium hydroxide to the seawater concentrated water to produce sludge;
Drying the sludge; And
Pulverizing the dried sludge to produce precipitated sludge in the form of fine powder
Wherein the alkali-activated cured product is an alkali-activated cured product.
10. The method of claim 9,
The step of drying the sludge
At a temperature of 105 DEG C for 1 hour to 7 days.
The method according to claim 1,
The step of preparing the mixture
Mixing the blast furnace slag and the settling sludge to produce a first mixture; And
Mixing the first mixture and the alkali activating agent to prepare a second mixture
Wherein the alkali-activated cured product is an alkali-activated cured product.
The method according to claim 1,
The curing step
At a temperature of 20 ° C to 40 ° C for 3 days to 28 days.

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