Cement mixing agent composition using ferro-nickel slag powder and method of manufacturing the composition

Abstract

The present invention relates to a cement admixture composition, and more specifically, to a cement admixture composition that overcomes the problems of ferronickel slag powder.

Description

Technology Field

[0001] The present invention relates to a cement admixture composition, and more specifically, to a cement admixture composition that overcomes the problems of ferronickel slag powder. Background Technology

[0002] Ferronickel slag (FeNi slag) is a byproduct (slag) generated during the nickel smelting process. It is produced when nickel-iron alloys (ferronickel) are manufactured at smelters through high-temperature treatment of nickel-containing ore. As the demand for nickel has increased both domestically and internationally, the volume of ferronickel slag has also risen, leading to various attempts and research to industrially recycle this byproduct.

[0003] As shown in Table 1 below, ferronickel slag is composed mainly of SiO₂ 2, It contains MgO, Al2O3, CaO, etc., and has a relatively high MgO content compared to general blast furnace slag or steel slag, and also differs somewhat in crystal structure and physical properties.

[0004] Due to its excellent high strength, wear resistance, and chemical stability, it is evaluated as having high potential for use in construction materials and ceramic materials.

[0005] However, the use of ferronickel slag as a cement admixture has the following limitations: it delays the development of cement strength, raises concerns regarding long-term environmental stability, makes uniform mixing with existing cement raw materials difficult, and may cause issues with reduced durability in specific environments. Prior art literature

[0006] Republic of Korea Registered Patent Publication No. 10-1690173 The problem to be solved

[0007] The present invention resolves the problems associated with ferronickel slag when used as a cement admixture.

[0008] Furthermore, the technical problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned technical problems will be clearly understood by those skilled in the art to which the present invention belongs from the description below. means of solving the problem

[0009] To achieve the above objective, a cement admixture composition according to one embodiment of the present invention comprises ferronickel slag powder; an alkali activator; and gypsum (CaSO4·2H2O).

[0010] The ferronickel slag powder may comprise 30 to 50 wt% CaO; 5 to 40 wt% SiO2; 5 to 15 wt% Al2O; 5 to 10 wt% MgO; 0.5 to 10 wt% FeO; 1 to 5 wt% MnO; and 0.5 to 3 wt% TiO2.

[0011] The above alkali activator may be Na2CO3, NaOH, or Na2SiO3, and the alkali activator may be included in an amount of 0.08 to 0.12 wt%.

[0012] The cement admixture composition may further include 5 wt% of fine silica (SiO2) and 8 to 10 wt% of fly ash.

[0013] In addition, a method for preparing a cement admixture composition according to one embodiment of the present invention comprises the steps of: grinding ferronickel slag to produce ferronickel slag powder; and adding an alkali activator and gypsum (CaSO4·2H2O) to the ferronickel slag to produce a cement admixture composition.

[0014] A grinding accelerator may be added during the step of manufacturing the ferronickel slag powder, and the grinding accelerator may be added in an amount of 0.03 to 0.05 parts by weight per 100 parts by weight of the ferronickel slag.

[0015] The particle size of the above ferronickel slag powder may be 10 μm.

[0016] The above alkali activator may be Na2CO3, NaOH, or Na2SiO3, and the alkali activator may be added in an amount of 0.08 to 0.12 wt%.

[0017] The step of preparing the above cement admixture composition may further include adding 5 wt% of fine silica (Silica Fume; SiO2) and 8 to 10 wt% of fly ash. Effects of the invention

[0018] The present invention has the effect of enabling the use of ferronickel slag as a cement admixture. Specific details for implementing the invention

[0019] Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0021] A cement admixture composition according to one embodiment of the present invention comprises ferronickel slag powder; an alkali activator; and gypsum (CaSO4·2H2O).

[0022] The above cement admixture is added to cement to improve the performance of concrete or to impart specific physical properties, and the cement admixture may control the strength, durability, hydration reaction, workability, etc. of concrete.

[0024] The ferronickel slag powder may comprise 30 to 50 wt% CaO; 5 to 40 wt% SiO2; 5 to 15 wt% Al2O; 5 to 10 wt% MgO; 0.5 to 10 wt% FeO; 1 to 5 wt% MnO; and 0.5 to 3 wt% TiO2.

[0026] The ferronickel slag powder may have a particle size of 10 μm. By doing so, it can more easily participate in the cement hydration reaction, thereby promoting the hydration reaction and increasing the development of the cement's early strength and long-term strength, and the reactivity within the cement can be improved by activating the pozzolanic reaction.

[0027] The above alkali activator is a chemical admixture that helps to exhibit a bonding strength similar to cement, and the alkali activator may be Na2CO3, NaOH, or Na2SiO3. The alkali activator may be included in an amount of 0.08 to 0.12 wt% of the total composition of the cement admixture composition.

[0029] The above cement admixture composition may further include one or more selected from the group consisting of fly ash; calcium nitrate (Ca(NO3)2); fine silica (SiO2); magnesium oxide (MgO); superplasticizers; and latex.

[0031] The fly ash may contain SiO2 and / or Al2O3. The fly ash may be included in an amount of 8 to 10 wt% of the total composition of the cement admixture. The fly ash can prevent cracking of the cement by reacting with calcium hydroxide (Ca(OH)2) generated during the hydration reaction of cement to cause a pozzolanic reaction.

[0032] The fine silica (Silica Fume; SiO2) may be included in the total composition at 5 wt%.

[0033] The above superplastic agent is an admixture that improves strength by reducing the water-cement ratio (W / C) while significantly increasing the fluidity of concrete, and the above superplastic agent may be one or more selected from the group consisting of sulfonated melamine formaldehyde (SMF); sulfonated naphthalene formaldehyde (SNF); and polycarboxylate ether (PCE).

[0034] The above latex is intended to improve the strength, adhesion, water resistance, chemical resistance, etc. of cement or concrete, and the above latex may be one or more selected from the group consisting of SBR (Styrene-Butadiene Rubber); EVA (Ethylene-Vinyl Acetate); Acrylic (PMMA, Poly(methyl methacrylate)); PU (Polyurethane Latex); and PVA (Polyvinyl Acetate).

[0036] The method for preparing a cement admixture composition of the present invention comprises the steps of: grinding ferronickel slag to produce ferronickel slag powder; and adding an alkali activator and gypsum (CaSO4·2H2O) to the ferronickel slag to produce a cement admixture composition.

[0038] In the step of manufacturing the ferronickel slag powder, a grinding accelerator may be added, and the grinding accelerator may be ethylene glycol, and the grinding accelerator may be added in an amount of 0.03 to 0.05 parts by weight per 100 parts by weight of the ferronickel slag.

[0039] In addition, in the step of manufacturing the ferronickel slag powder, the particle size of the ferronickel slag powder may be 10 μm.

[0041] The alkali activator is a chemical admixture that helps to exhibit a bonding strength similar to cement, and the alkali activator may be Na2CO3, NaOH, or Na2SiO3. The alkali activator may be included in an amount of 0.08 to 0.12 wt% of the total composition of the cement admixture composition.

[0043] In addition, in the step of preparing the cement admixture composition, one or more selected from the group consisting of fly ash; calcium nitrate (Ca(NO3)2); fine silica (SiO2); magnesium oxide (MgO); superplasticizers; and latex may be further added.

[0044] The fly ash may contain SiO2 and / or Al2O3. The fly ash may be included in an amount of 8 to 10 wt% of the total composition of the cement admixture. The fly ash can prevent cracking of the cement by reacting with calcium hydroxide (Ca(OH)2) generated during the hydration reaction of cement to cause a pozzolanic reaction.

[0045] The fine silica (Silica Fume; SiO2) may be included in the total composition at 5 wt%.

[0046] The above superplastic agent is an admixture that improves strength by reducing the water-cement ratio (W / C) while significantly increasing the fluidity of concrete, and the above superplastic agent may be one or more selected from the group consisting of sulfonated melamine formaldehyde (SMF); sulfonated naphthalene formaldehyde (SNF); and polycarboxylate ether (PCE).

[0047] The above latex is intended to improve the strength, adhesion, water resistance, chemical resistance, etc. of cement or concrete, and the above latex may be one or more selected from the group consisting of SBR (Styrene-Butadiene Rubber); EVA (Ethylene-Vinyl Acetate); Acrylic (PMMA, Poly(methyl methacrylate)); PU (Polyurethane Latex); and PVA (Polyvinyl Acetate).

[0049] Although preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

Claims

Claim 1 A cement admixture composition comprising ferronickel slag powder; an alkali activator; and gypsum (CaSO4·2H2O). Claim 2 A cement admixture composition according to claim 1, wherein the ferronickel slag powder comprises 30 to 50 wt% CaO; 25 to 40 wt% SiO2; 35 to 15 wt% Al2O; 5 to 10 wt% MgO; 0.5 to 10 wt% FeO; 1 to 5 wt% MnO; and 0.5 to 3 wt% TiO2. Claim 3 A cement admixture composition according to claim 1, wherein the alkali activator is Na2CO3, NaOH, or Na2SiO3. Claim 4 A cement admixture composition according to claim 1, wherein the alkali activator is included in an amount of 0.08 to 0.12 wt%. Claim 5 A cement admixture composition according to claim 1, further comprising 5 wt% fine silica (Silica Fume; SiO2) and 8 to 10 wt% fly ash. Claim 6 A method for preparing a cement admixture composition, comprising the steps of: grinding ferronickel slag to produce ferronickel slag powder; and adding an alkali activator and gypsum (CaSO4·2H2O) to the ferronickel slag to produce a cement admixture composition. Claim 7 A method for manufacturing a cement admixture composition according to claim 6, wherein a grinding accelerator is added during the step of manufacturing the ferronickel slag powder. Claim 8 A method for manufacturing a cement admixture composition according to claim 7, wherein the grinding accelerator is added in an amount of 0.03 to 0.05 parts by weight per 100 parts by weight of the ferronickel slag. Claim 9 A method for manufacturing a cement admixture composition according to claim 6, wherein the particle size of the ferronickel slag powder is 10 μm. Claim 10 A method for preparing a cement admixture composition according to claim 6, wherein the alkali activator is Na2CO3, NaOH, or Na2SiO3. Claim 11 A method for manufacturing a cement admixture composition according to claim 6, wherein the alkali activator is added in an amount of 0.08 to 0.12 wt%. Claim 12 A method for manufacturing a cement admixture composition according to claim 6, wherein the step of manufacturing the cement admixture composition comprises further adding 5 wt% of fine silica (Silica Fume; SiO2) and 8 to 10 wt% of fly ash.

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