KR102204139B1 - Non-cement binder composition and manufacturing method of the same - Google Patents

Abstract

The cementless binder composition according to an embodiment of the present invention is a cementless binder composition comprising a lithium residue and an alkali stimulating agent, and the particle size of the lithium residue is 0.075mm or less.
A method for preparing a cementless binder composition according to another embodiment of the present invention includes preparing a lithium residue, adjusting a particle size of the lithium residue, and mixing the lithium residue with an alkali stimulating agent, and the lithium The step of adjusting the particle size of the residue is to adjust the particle size of the lithium residue to 0.075mm or less.

Description

Cementless binder composition, and manufacturing method thereof TECHNICAL FIELD [Non-CEMENT BINDER COMPOSITION AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to a cementless binder composition, and a method for producing a cementless binder composition. More specifically, it relates to a cementless binder composition using a lithium residue, and a method of manufacturing a cementless binder composition.

Cement generally used undergoes a sintering process in which limestone is decomposed at high temperature to produce reactive calcium silicate and aluminate phases. In this process, a large amount of carbon dioxide is emitted, which is pointed out as a major factor in greenhouse gas emission. In addition, the depletion of natural resources of limestone, the inflow of fine dust from the kiln operation, and the like, contain hexavalent chromium, which poses water and soil pollution problems.

Cementless binders can solve problems such as depletion of natural resources, air pollution, and heavy metals as well as carbon dioxide emissions by omitting the firing step using a kiln, so research is actively being conducted as a way to replace conventional cement for environmental protection. In progress.

It provides a cementless binder composition using a lithium residue generated in a process of extracting lithium from lithium ore, and a method of manufacturing a cementless binder.

The cementless binder composition according to an embodiment of the present invention is a cementless binder composition comprising a lithium residue and an alkali stimulating agent.

The particle size of the lithium residue may be 0.075mm or less.

With respect to 100% by weight of the binder composition, the alkali stimulating agent may be 5 to 15% by weight.

The lithium residue may have an aluminosilicate component of 80% by weight or more based on 100% by weight of the lithium residue.

The alkali stimulating agent is sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium metasilicate (Na ₂ SiO ₃ ), calcium hydroxide (Ca(OH) ₂ ), magnesium hydroxide ( Magnesium hydroxide, Mg(OH) ₂ ), and may be selected from the group consisting of a mixture thereof.

A method of preparing a cementless binder composition according to another embodiment of the present invention includes preparing a lithium residue, adjusting a particle size of the lithium residue, and mixing the lithium residue with an alkali stimulating agent.

Adjusting the particle size of the lithium residue may be adjusting the particle size of the lithium residue to 0.075 mm or less.

Before the step of adjusting the particle size of the lithium residue, washing the lithium residue with water may be further included.

The pH of the lithium residue may be adjusted to a neutral range by washing the lithium residue with water.

The mixing of the lithium residue and the alkali stimulating agent may include mixing 5 to 15% by weight of the alkali stimulating agent with the lithium residue based on 100% by weight of the lithium residue and the alkali stimulating agent mixture.

In the step of mixing the lithium residue and an alkali stimulating agent, the alkali stimulating agent is sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium metasilicate (Na ₂ SiO ₃ ), calcium hydroxide (Calcium hydroxide). , Ca (OH) ₂ ), magnesium hydroxide (Magnesium hydroxide, Mg (OH) ₂ ), and may be selected from the group consisting of a mixture thereof.

In the step of preparing the lithium residue, the lithium residue may contain 80% by weight or more of an aluminosilicate component based on 100% by weight of the lithium residue.

In the step of preparing the lithium residue, the lithium residue may be a residue obtained after lithium is extracted from the lithium-containing ore.

Preparing the lithium residue may include heat-treating a lithium-containing ore, pulverizing the heat-treated lithium-containing ore, depositing a lithium component in the pulverized lithium-containing ore as lithium sulfate, and adding the lithium sulfate to water. It may include a step of leaching, and obtaining a lithium residue by solid-liquid separation.

The cementless binder composition according to an embodiment of the present invention can provide a by-product recycling method by manufacturing a cementless binder composition that can replace existing cement by using lithium residues generated in the process of extracting lithium from lithium ore. In addition, it is possible to solve problems such as emission of large amounts of carbon dioxide, depletion of natural resources, air pollution, and heavy metal problems that occur during cement manufacturing.

1 is a diagram showing a crystal structure transition of a mineral and a crystal structure of a lithium residue in a heat treatment of lithium ore, sulfuric acid roasting, and water leaching.
2 shows the XRD analysis results of lithium residues generated in a solid-liquid separation process after water leaching.
3 shows the particle size distribution of lithium residues generated in a solid-liquid separation process after water leaching.

Hereinafter, embodiments of the present invention will be described in detail. However, this is presented as an example, and the present invention is not limited thereby, and the present invention is only defined by the scope of the claims to be described later.

In the present specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

In this specification, the terminology used is only for referring to specific embodiments, and is not intended to limit the invention. Singular forms as used herein also include plural forms unless the phrases clearly indicate the opposite. The meaning of “comprising” as used in the specification specifies a specific characteristic, region, integer, step, action, element and/or component, and the presence of another characteristic, region, integer, step, action, element and/or component, or It does not exclude additions. Also, the singular form includes the plural form unless specifically stated in the text.

Throughout the specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless specifically stated to the contrary.

When a part of a layer, film, region, plate, etc. is said to be "on" or "on" another part, this includes not only the case where the other part is "directly above" but also the case where there is another part in the middle. In addition, throughout the specification, the term "on" means that it is positioned above or below the target portion, and does not necessarily mean that it is positioned above the direction of gravity.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms defined in a commonly used dictionary are additionally interpreted as having a meaning consistent with the related technical literature and the presently disclosed content, and are not interpreted in an ideal or very formal meaning unless defined. For example, mixing is used interchangeably with compounding.

Therefore, in some embodiments, well-known techniques have not been described in detail in order to avoid obscuring interpretation of the present invention.

Hereinafter, preferred examples and comparative examples of the present invention will be described. However, the following examples are only preferred examples of the present invention, and the present invention is not limited to the following examples.

In general, cementless binders do not contain C2S, C3S, C4AF, and C3A components, which are components of cement, but they are substances that have the properties of a binder by causing an activation reaction by a metallic alkali component.

The cementless binder composition according to an embodiment of the present invention includes a lithium residue and an alkali stimulating agent.

A method of preparing a cementless binder composition according to another embodiment of the present invention includes preparing a lithium residue, adjusting a particle size of the lithium residue, and mixing the lithium residue with an alkali stimulating agent.

In the step of preparing the lithium residue, lithium is extracted from the lithium-containing ore, and then the residue is obtained by solid-liquid separation.

Specifically, the step of preparing the lithium residue may include heat-treating the obtained residue lithium-containing ore, pulverizing the heat-treated lithium-containing ore, and depositing a lithium component in the pulverized lithium-containing ore as lithium sulfate , Leaching the lithium sulfate into water, and obtaining a lithium residue by solid-liquid separation.

1 shows the crystal structure transition of minerals and the crystal structure of lithium residues in heat treatment of lithium ore, sulfuric acid roasting, and water leaching.

Spodumene (Li ₂ O Al ₂ O ₃ 4SiO ₂ , LiAl ₂ Si ₂ O ₆ ), the main mineral phase of lithium ore, is dissociated from sulfuric acid at the Li ⁺ ion site of the ore by the sulfuric acid roasting process. The exchanged Li ⁺ ions are bonded to the dissociated SO ₄ ^2- ions and precipitated as Li ₂ SO ₄ by the progress of the precipitation reaction, and then water-soluble Li ₂ SO ₄ is leached into water in the water leaching process.

On the other hand, the remaining components, Al ₂ O ₃ and SiO ₂ , remain in the lithium residue in the form of aluminosilicate (Al ₂ O ₃ 4SiO ₂ , AlSi ₂ O ₆ ) solid compounds.

The lithium residue may include 80% by weight or more of an aluminosilicate compound based on 100% by weight of the lithium residue. Specifically, it may be 80 to 95% by weight, 80 to 90% by weight, 80 to 87% by weight, or 80 to 85% by weight. The aluminosilicate compound is a substance that exhibits latent hydraulicity. When the content of the aluminosilicate compound is too small, it is difficult to develop latent hydraulicity, and it is not possible to secure an appropriate strength as a binder.

2 shows the XRD analysis results of lithium residues generated in a solid-liquid separation process after water leaching.

Table 1 shows the components and contents according to XRF analysis of lithium residues generated in the solid-liquid separation process after water leaching.

ingredient Li ₂ O Al ₂ O ₃ SiO ₂ CaO Na ₂ O K ₂ O P ₂ O ₅ Fe ₂ O ₃ CoO MnO Cr ₂ O ₃ MgO CuO NiO TiO ₂ content
(wt%) analysis
Impossible 25.8 66.2 0.4 0.1 0.5 0.1 1.6 - 0.1 0.03 0.1 - 0.01 0.04

As a calcium aluminosilicate material in which SiO ₂ and Al ₂ O ₃ are acidic and CaO and MgO are basic, it does not exhibit hydraulic properties when in contact with water, but it exhibits remarkable hydraulic properties when a small amount of slaked lime is present as an alkali stimulant It is a hydraulic material.

Specifically, the mechanism of latent hydraulic expression of the aluminosilicate compound is as follows.

When the lithium residue containing the aluminosilicate compound comes into contact with water, first, Ca, Mg ions, etc. are relatively easily eluted into the water, and the lithium residue particles are charged with a negative charge. This is because Ca-O bonds, Mg-O bonds are relatively weaker than Si-O bonds, or Al-O bonds, so the bonds are easily broken, and Ca and Mg ions are eluted in water.

After that, the cations H ⁺ and H ₃ O ⁺ in the aqueous solution move to the surface of the negatively charged lithium residue particles to form an impermeable film.

It destroys the ion impermeable film ^- the increasing concentrations and increasing (OH) ^- the alkali stimulant (OH) react with water in the aqueous solution.

(OH) ^- as film breaking impermeable by ions and impermeable novelties be eluted by coating SiO ₄ ^- and AlO ^2- ions are eluted into the aqueous solution.

SiO ₄ ^- and AlO ₂ ^- ions eluted into the aqueous solution react with Ca(OH) ₂ to form CSH gel or CAH gel insoluble salts, whereby the strength is expressed.

Lithium alumino-silicate residue consisting of the compound, so that the pozzolanic material, to co-exist, the cement material or (OH) ^- when the coexistence source that can supply causes pozzolanic reaction.

The alkali stimulating agent is sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium metasilicate (Na ₂ SiO ₃ ), calcium hydroxide (Ca(OH) ₂ ), magnesium hydroxide ( Magnesium hydroxide, Mg(OH) ₂ ), and may be selected from the group consisting of a mixture thereof.

3 shows the particle size distribution of lithium residues generated in a solid-liquid separation process after water leaching.

3 shows that the particle size distribution of the lithium residue is d(0.1): 4.25um, d(0.5): 25.817um, d(0.9): 129.642 um. That is, the volume of particles having a particle size of 4.25 μm or less occupies 10% by volume in the total lithium residue sample, and the volume of particles having a particle size of 25.817 μm or less accounts for 50% by volume of the total lithium residue sample. In addition, it can be seen that the volume of particles having a particle size of 129.642um or less occupies 90% by volume in the total lithium residue sample.

The step of adjusting the particle size of the lithium residue may be performed by grinding or classifying, and the particle size of the lithium residue may be adjusted to 0.075 mm or less. Specifically, it may be more than 0mm and less than 0.075mm. In this case, a single crystal phase of silica that does not contribute to the pozzolanic reaction can be removed, and since only aluminosilicate components that contribute to the pozzolanic reaction are present in the lithium residue, the hydrolysis and ion elution reactions by the alkali stimulator occur smoothly, and the hydraulic properties are It can be expressed effectively.

If the particle size is too large, a single crystal phase of silica or Na (AlSi ₃ O ₈ ) may be included in the lithium residue, thereby inhibiting hydraulic expression.

Before the step of adjusting the particle size of the lithium residue, the step of washing the lithium residue may be further included. The step of washing the lithium residue with water refers to adjusting the pH to a neutral region (pH6 to pH7, or pH6 to pH8) by washing the lithium residue with water. Since the lithium residue contains sulfuric acid used in the previous sulfuric acid roasting process, it is acidic.

When the lithium residue is not washed with water and is mixed with an alkali stimulating agent, the injected alkali stimulating agent is consumed to neutralize sulfate ions remaining in the lithium residue. Therefore, there is a problem that the manufacturing cost is increased due to the addition of an excessive amount of the alkali stimulant. In addition, since the residual sulfate ions suppress the formation of insoluble salts that express the strength of the binder until neutralization is completed, hydraulic expression may be delayed.

The step of mixing the lithium residue and the alkali stimulating agent may include adding 5 to 15% by weight of the alkali stimulating agent based on 100% by weight of the lithium residue and the alkali stimulating agent mixture, and mixing the lithium residue with the lithium residue.

Specifically, when 5% by weight of an alkali stimulating agent is added, the lithium residue may be added at 95% by weight. In addition, when 15% by weight of the alkali stimulating agent is added, the amount of the lithium residue may be 85% by weight.

When the content of the alkali stimulating agent is too small, hydrolysis and ion elution may not occur sufficiently, and thus hydraulicity may not be expressed or the degree of hydroponic expression may be poor. If the content of the alkali stimulant is too high, although the strength does not increase any more, there is a problem that the amount of the alkali stimulant is increased, resulting in an increase in manufacturing cost.

Hereinafter, specific examples of the present invention will be described. However, the following examples are only specific examples of the present invention, and the present invention is not limited to the following examples.

Manufacturing example

(1) Preparation of lithium residue

After removing feldspar and mica from lithium ore with about 1.5% Li ₂ O content based on flotation, etc., and then concentrating about 6% Li ₂ O content, heat treatment at 1000°C to convert to β-spodumene. The particle size was adjusted to improve reactivity in the subsequent process by grinding.

95% sulfuric acid was added 3 times by weight ratio to β-spodumene whose particle size was adjusted, mixed, and then roasted with sulfuric acid for 1 hour at 250°C.

After roasting with sulfuric acid, 5 times the weight of water was added and stirred for 1 hour, followed by water leaching for 1 hour, followed by solid-liquid separation using a filter press, and lithium residue was recovered in this process.

The composition and content of the lithium residue recovered from the filter press were analyzed by XRF and ICP, respectively, and are shown in Tables 2 and 3.

The moisture content of the lithium residue recovered from the filter press was about 39%, and the pH of the residue was about 3.1.

According to the XRF analysis shown in Table 2, the lithium residue is composed of a material mainly composed of aluminosilicate, which is Al ₂ O ₃ about 26% and SiO ₂ about 66%, and in addition, Fe ₂ O ₃ is about 1.6%, CaO, K It can be seen that alkali metal elements such as ₂ O and Na ₂ O are contained as impurities of 0.1 to 0.5%, respectively.

ingredient Li ₂ O Al ₂ O ₃ SiO ₂ CaO Na ₂ O K ₂ O P ₂ O ₅ Fe ₂ O ₃ CoO MnO Cr ₂ O ₃ MgO CuO NiO TiO ₂ content
(wt%) analysis
Impossible 25.8 66.2 0.4 0.1 0.5 0.1 1.6 - 0.1 0.03 0.1 - 0.01 0.04

ingredient Li Al Si Ca Na K P Fe Co Mn Cr Mg Cu Ni content
(wt%) 0.51 12.59 28.41 0.32 0.4 0.6 0.063 1.11 <0.005 0.11 0.023 0.21 <0.005 0.01

According to the ICP analysis shown in Table 3, the lithium residue has a Si/Al element composition ratio of about 2.3. Although about 0.5% of the lithium component remains, this is because the filtration process was carried out once after water leaching, and the residual moisture content is about 40 wt%, so that the lithium component does not sufficiently escape and remains in the lithium residue in a water state.

The lithium component remaining in the lithium residue can be separately recovered by repeating the washing and filtration processes with water, and the lithium component remaining in the lithium residue can be minimized.

2 shows the results of XRD analysis of the obtained lithium residue. It can be seen that 83.7 wt% aluminosilicate was contained in the obtained lithium residue.

Example

(2) pH adjustment of lithium residue

Example 1 Preparation) 15Kg of distilled water was added to 3Kg of lithium residue having the chemical composition shown in Table 1, adjusted to a high-liquid ratio (water/lithium residue) 5/1 condition, stirred at 500 rpm for 3 hours, and then filtered three times. A residue washed three times was prepared.

The pH of the prepared residue was measured according to the pH measurement standard of the waste process test method, and the results are shown in Table 4 below.

Comparative Examples 1 and 2 Preparation) Except that the water washing operation was performed only once and twice, it was carried out under the same conditions as in Example 1, and the pH of the prepared residue was measured and shown in Table 4 below.

division High cost
(Lithium residue/water weight ratio) Water (times) Residue pH Example 1 1/5 3 6.08 Comparative Example 1 1/5 One 3.23 Comparative Example 2 1/5 2 3.84

As shown in Example 1 of Table 4, the pH of the lithium residue prepared by repeating the water washing process three times under the condition of 1/5 of the high-liquid ratio (lithium residue/water weight ratio) was 6.08, and the lithium residue (pH 3.13) of the preparation example ), it was confirmed that the pH rose to 6.08 and reached the neutral pH range. This is because the excess unreacted sulfuric acid solution remaining in the lithium residue was removed by repeated washing with water.

However, in Comparative Examples 1 and 2, when the washing step was performed only once or twice, it was confirmed that the pH of the lithium residue was 3.23 and 3.84, respectively. It can be seen that sulfuric acid remains in the lithium residue.

In order to produce a cementless binder material using lithium residue, an alkali stimulating material must be added to cause a pozzolanic reaction by an alkali action.

However, when an acid component such as an unreacted sulfuric acid solution remains in the residue, the added alkali component is first consumed for neutralization of the unreacted acid remaining in the residue, and thus more alkali must be added to induce the pozzolanic reaction.

Therefore, by sufficiently washing the lithium residue with water to remove the excess unreacted sulfuric acid remaining in the residue and adjusting the pH of the residue to the neutral region, not only the amount of alkali stimulating material added can be reduced, but also the added alkali stimulation. Ash can contribute to the pozzolanic reaction as efficiently as possible.

(3) particle size control of lithium residue

Examples 2 and 3) The lithium residue of Example 1 was sieved and classified and sorted into 0.075 mm (75 um) sieve samples and 0.05 mm (50 um) sieve samples, respectively, and the samples were analyzed through XRD. The crystal phase was confirmed, and the results are shown in Table 6.

Comparative Examples 3 and 4) The lithium residue of Example 1 was sieved and classified into a 0.075 mm (75 um) sieve sample and a 0.1 mm (100 um) sieve sample, respectively, and the samples were analyzed by XRD. The crystal phase was confirmed, and the results are shown in Table 6.

division Particle size (sieve)
(mm) Crystal phase type (XRD) and content (WPPF: Whole powder profile fitting method) Example 2 0.075mm or less Aluminosillicate (Al ₂ O ₃ 4SiO ₂ ) Example 3 0.05mm or less Aluminosillicate (Al ₂ O ₃ 4SiO ₂ ) Comparative Example 2 Less than 0.1mm, more than 0.075mm Aluminosillicate (Al ₂ O ₃ 4SiO ₂ )+ SiO ₂ (15.7%) + Albite (7.1%) Comparative Example 3 More than 0.1mm Aluminosillicate (Al ₂ O ₃ 4SiO ₂ )+ SiO ₂ (16.0%) + Albite (7.5%)

As shown in Examples 2 and 3 of Table 5, when the particle size of the lithium residue was 0.075 mm or less, it was confirmed that the aluminosilicate compound was made of a single phase crystal. However, when the particle size exceeds 0.075 mm as in Comparative Examples 3 and 4, it was confirmed that some silica crystals that do not contribute to the pozzolanic reaction in addition to the aluminosilicate compound were included.

That is, when the particle size of the lithium residue is adjusted to 0.075 mm or less, a lithium residue composed of a single phase crystal of an aluminosilicate compound can be obtained.

(4) Alkaline stimulant mixture

Examples 4, 5, 6) To 70 g of the lithium residue of Example 3, NaOH as an alkali stimulating material was added in a weight ratio of 5%, 10%, and 15%, respectively, and uniformly mixed to prepare a cementless binder raw material.

In addition, 275g of sand was uniformly mixed each to prepare a molded body to check the strength development characteristics according to the addition conditions of the alkali stimulating material.

A material in which lithium residue, alkali stimulus, and sand were mixed was prepared in a 5X5X5cm mold, dried at 60°C for 24 hours, demolded, and cured in a state immersed in water at room temperature.

The strength characteristics of the molded body according to the curing time were evaluated, and the results are shown in Table 6.

Through the strength characteristics of the molded body, the effect of expressing strength due to the pozzolanic reaction can be confirmed.

Comparative Examples 5 and 6) The same method as in Examples 4, 5 and 6, except that NaOH as an alkali stimulating material was added and mixed with 2.5% and 20% by weight of lithium residue raw material, respectively, to prepare a cementless binder raw material. And the results are shown in Table 6.

Raw material Alkaline stimulant
(weight%) Compressive strength 7 days 14 days 28 days Example 4 Lithium residue, 0.05mm 5 125 146 171 Example 5 Lithium residue, 0.05mm 10 134 146 191 Example 6 Lithium residue, 0.05mm 15 164 190 232 Comparative Example 5 Lithium residue, 0.05mm 2.5 51 73 93 Comparative Example 6 Lithium residue, 0.05mm 20 160 187 220

As shown in Examples 4, 5, and 6 of Table 6, a cementitious binder prepared by using particles having a particle size of 0.05 mm or less of a lithium residue and adding 5 to 15% by weight to a lithium residue raw material as an alkali stimulating material was used. It was confirmed that the strength of the applied molded article increased as the water curing period increased.

In addition, as the addition amount of the alkali stimulating material increases from 5% to 15%, the strength expression characteristics gradually increase.

However, when the amount of the alkali stimulating material added is less than 5% (Comparative Example 5), the strength expression characteristics are insignificant, and when the amount of the alkali stimulating material added is more than 15% (Comparative Example 6), there is no further increase in strength and a tendency to stagnate. Can be seen.

That is, it is possible to prepare a cementless binder composition and a cementless binder using lithium residue generated in the process of extracting lithium from lithium ore according to an embodiment of the present invention.

The present invention is not limited to the above embodiments, but may be manufactured in a variety of different forms, and a person of ordinary skill in the art to which the present invention pertains to other specific forms without changing the technical spirit or essential features of the present invention. It will be appreciated that it can be implemented with. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

Claims (12)

Lithium residue; And
An alkali stimulating agent; a cementless binder composition containing,
The particle size of the lithium residue is 0.075mm or less,
With respect to 100% by weight of the binder composition, the alkali stimulating agent is 5 to 15% by weight,
The lithium residue, based on 100% by weight of the lithium residue, that the aluminosilicate component is 80% by weight or more,
Cementless binder composition.
delete delete The method of claim 1,
The alkali stimulating agent is sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium metasilicate (Na ₂ SiO ₃ ), calcium hydroxide (Ca(OH) ₂ ), magnesium hydroxide ( Magnesium hydroxide, Mg (OH) ₂ ), and those selected from the group consisting of mixtures thereof,
Cementless binder composition.
Preparing a lithium residue;
Adjusting the particle size of the lithium residue; And
Including; mixing the lithium residue and an alkali stimulating agent;
Adjusting the particle size of the lithium residue includes adjusting the particle size of the lithium residue to 0.075 mm or less,
In the step of mixing the lithium residue and the alkali stimulating agent, 5 to 15% by weight of the alkali stimulating agent are mixed with the lithium residue, based on 100% by weight of the lithium residue and the alkali stimulating agent mixture,
In the step of preparing the lithium residue, the lithium residue contains 80% by weight or more of an aluminosilicate component based on 100% by weight of the lithium residue,
Method for producing a cementless binder composition.
The method of claim 5,
Before the step of adjusting the particle size of the lithium residue,
Washing the lithium residue with water; which further comprises,
Method for producing a cementless binder composition.
The method of claim 6,
The pH of the lithium residue is adjusted to a neutral range by washing the lithium residue with water,
Method for producing a cementless binder composition.
delete The method of claim 5,
In the step of mixing the lithium residue and an alkali stimulant
The alkali stimulating agent is sodium hydroxide (NaOH), potassium hydroxide (KOH), sodium metasilicate (Na ₂ SiO ₃ ), calcium hydroxide (Ca(OH) ₂ ), magnesium hydroxide ( Magnesium hydroxide, Mg(OH) ₂ ), and mixtures thereof.
Method for producing a cementless binder composition.
delete The method of claim 5,
In the step of preparing the lithium residue
The lithium residue is a residue obtained after lithium is extracted from the lithium-containing ore,
Method for producing a cementless binder composition.
The method of claim 5,
The step of preparing the lithium residue
Heat-treating the lithium-containing ore;
Pulverizing the heat-treated lithium-containing ore;
Precipitating a lithium component in the pulverized lithium-containing ore as lithium sulfate;
Leaching the lithium sulfate into water; And
Comprising; obtaining a lithium residue by solid-liquid separation,
Method for producing a cementless binder composition.

Images