Glass fiber using blast furnace slag and method of manufacturing thereof

Abstract

As a result of repeated research suitable for manufacturing slag fibers using blast furnace slag generated from steel slag, an optimal content ratio for vitrification is derived by adding glass raw materials as additives to the blast furnace slag, and a method for manufacturing the same is disclosed. A method for manufacturing glass long fibers using blast furnace slag according to the present invention comprises: (a) a step of mixing blast furnace slag generated during the process of manufacturing pig iron in a blast furnace with glass raw materials; (b) a step of melting the mixed mixture; (c) a step of spinning the molten material into a thread form using a bushing having a structure with a plurality of nozzle holes; (d) a step of cooling the molten material spun into a thread form; (e) a step of gathering the cooled glass long fibers in the thread form through a gathering shoe; and (f) a step of winding the gathered glass long fibers; wherein, after step (f), the glass long fiber comprises 30 to 70 weight% of blast furnace slag and 70 to 30 weight% of glass raw materials.

Description

Technology Field

[0001] The present invention relates to glass long fibers using blast furnace slag and a method for manufacturing the same. More specifically, it relates to glass long fibers using blast furnace slag and a method for manufacturing the same, wherein, as a result of repeated research suitable for manufacturing slag fibers using blast furnace slag generated from steel slag, an optimal content ratio capable of vitrification is derived by adding glass raw materials as additives to the blast furnace slag. Background Technology

[0003] Slag is a byproduct generated during the steel smelting process. As such, slag is a material produced as a byproduct during the manufacture of steel products, and steel mills have been treating and storing the slag through methods such as aging to solve problems such as leachate and airborne dust.

[0004] As such slag is a steel byproduct with excellent properties such as heat resistance and chemical resistance, processing technology is required.

[0005] Accordingly, the present invention conducted research on a marble glass manufacturing process suitable for producing slag fibers using blast furnace slag generated from steel slag.

[0006] A relevant prior art document is Korean Patent Publication No. 10-2023-0169359 (published Dec. 15, 2023), which discloses a hardened body using slag containing glass MgO and a method for manufacturing the hardened body. The problem to be solved

[0008] The objective of the present invention is to provide a glass long fiber using blast furnace slag and a method for manufacturing the same, in which, as a result of repeated research suitable for manufacturing slag fibers using blast furnace slag generated from steel slag, an optimal content ratio capable of vitrification is derived by adding glass raw materials as additives to the blast furnace slag. means of solving the problem

[0010] A glass long fiber using blast furnace slag according to an embodiment of the present invention for achieving the above objective is a glass long fiber using blast furnace slag formed by melting a mixture of blast furnace slag and glass raw materials generated during the process of manufacturing pig iron in a blast furnace, wherein the glass long fiber comprises 30 to 70 weight% of blast furnace slag; and 70 to 30 weight% of glass raw materials.

[0011] The above blast furnace slag contains, as a chemical composition, 20 to 45 wt% CaO, 30.5 to 5 wt% Fe2O, 20.01 to 3 wt% MnO, 15 to 35 wt% SiO2, 10 to 25 wt% Al2O, 0.5 to 7 wt% MgO and 20.01 to 5 wt% TiO2.

[0012] The above glass raw material contains 10 to 30 wt% CaO, 10 to 25 wt% SiO2, 5 to 15 wt% Al2O3, 0.1 to 5 wt% MgO and 0.1 to 5 wt% TiO2.

[0013] In addition, the glass raw material may further include one or more selected from K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

[0014] It is more preferable that the above glass long fibers comprise 40 to 60 weight% of blast furnace slag; and 60 to 40 weight% of glass raw material.

[0015] The above glass long fiber contains Al2O3 10 to 20 wt%, SiO2 20 to 40 wt%, CaO 20 to 45 wt%, Fe2O3 0.5 to 5 wt%, MnO2 0.1 to 3 wt%, MgO 0.1 to 5 wt%, and TiO2 0.1 to 5 wt%.

[0016] In addition, the glass long fiber may further include one or more of K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

[0018] A method for manufacturing glass long fibers using blast furnace slag according to an embodiment of the present invention for achieving the above objective comprises: (a) a step of mixing blast furnace slag generated during the process of manufacturing pig iron in a blast furnace with glass raw materials; (b) a step of melting the mixed mixture; (c) a step of spinning the molten material into a thread form using a bushing having a structure with a plurality of nozzle holes; (d) a step of cooling the molten material spun into a thread form; (e) a step of gathering the cooled glass long fibers in the thread form through a gathering shoe; and (f) a step of winding the gathered glass long fibers; wherein, after step (f), the glass long fiber comprises 30 to 70 weight% of blast furnace slag and 70 to 30 weight% of glass raw materials.

[0019] The above blast furnace slag contains, as a chemical composition, 20 to 45 wt% CaO, 30.5 to 5 wt% Fe2O, 20.01 to 3 wt% MnO, 15 to 35 wt% SiO2, 10 to 25 wt% Al2O, 0.5 to 7 wt% MgO and 20.01 to 5 wt% TiO2.

[0020] The above glass raw material contains 10 to 30 wt% CaO, 10 to 25 wt% SiO2, 5 to 15 wt% Al2O3, 0.1 to 5 wt% MgO and 0.1 to 5 wt% TiO2.

[0021] In addition, the glass raw material may further include one or more selected from K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

[0022] In step (f) above, the winding is performed at a speed of 500 to 2,500 rpm.

[0023] After step (f) above, it is more preferable that the glass long fiber comprises 40 to 60 weight% of blast furnace slag; and 60 to 40 weight% of glass raw material.

[0024] After step (f) above, the glass long fiber comprises Al2O3 10 to 20 wt%, SiO2 20 to 40 wt%, CaO 20 to 45 wt%, Fe2O3 0.5 to 5 wt%, MnO2 0.1 to 3 wt%, MgO 0.1 to 5 wt%, and TiO2 0.1 to 5 wt%.

[0025] In addition, the glass long fiber may further include one or more of K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%. Effects of the invention

[0027] The glass long fiber using blast furnace slag and the method for manufacturing the same according to the present invention are the result of repeated research suitable for manufacturing slag fibers using blast furnace slag generated from steel slag, wherein an optimal content ratio capable of vitrification was derived by adding glass raw materials as additives to the blast furnace slag.

[0028] As such, the glass long fiber using blast furnace slag according to the present invention and the method for manufacturing the same can be made vitrified by mixing blast furnace slag in an optimized range of 30 to 70 weight% and glass raw material in 70 to 30 weight%, thereby inducing an increase in the content of SiO2 and Al2O3, which can form a glass structure, and an increase in the content of CaO and K2O, which serve to lower the melting temperature, as the content of glass raw material (E-glass) increases.

[0029] As a result, the glass long fiber using blast furnace slag according to the present invention and the method for manufacturing the same can prevent environmental pollution problems caused by the landfilling of blast furnace slag by recycling blast furnace slag, which is industrial waste, and can also enable the low-cost production of glass long fibers while contributing to carbon neutrality. Brief explanation of the drawing

[0031] FIG. 1 is a process flowchart showing a method for manufacturing glass long fibers using blast furnace slag according to an embodiment of the present invention. Figure 2 is a photograph showing the blast furnace slag raw material obtained by crushing the blast furnace slag. Figure 3 is a schematic diagram of the process for manufacturing marble glass using blast furnace slag raw materials. Figure 4 is a graph showing the XRD phase analysis evaluation results of marble glass manufactured using blast furnace slag raw materials. Figure 5 is a photograph showing glass raw material taken by crushing glass. Figure 6 is a schematic diagram of the process for manufacturing marbled glass using glass raw materials as additives to blast furnace slag. Figure 7 is a photograph showing marble glass produced by varying the content ratio of blast furnace slag 50 to 90 wt% and glass raw material (E-glass) 10 to 50 wt%. Figure 8 is a graph showing the results of X-ray rotational analysis for marble glass produced by varying the content ratio of blast furnace slag 50 to 90 wt% and glass raw material (E-glass) 10 to 50 wt%. FIG. 9 is a schematic diagram showing a laboratory fiber impression device. Figure 10 is a photograph showing the results of measuring the diameter of blast furnace slag fibers. Specific details for implementing the invention

[0032] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0033] The following is a detailed description of a glass long fiber using blast furnace slag and a method for manufacturing the same according to a preferred embodiment of the present invention, with reference to the attached drawings.

[0035] The glass long fiber using blast furnace slag according to an embodiment of the present invention is formed by melting a mixture of blast furnace slag generated during the process of manufacturing pig iron in a blast furnace and glass raw materials.

[0036] Blast furnace slag is a residue generated during the steel smelting process and is a byproduct produced during the manufacture of steel products. Steel mills treat and store blast furnace slag using methods such as aging to address issues like leachate and airborne dust. However, as blast furnace slag is a steel byproduct possessing excellent properties such as heat resistance and chemical resistance, treatment technology is required.

[0037] As such, blast furnace slag is a slag generated during the steel smelting process. As industrial waste, research is required to utilize it because discarding it as is leads to environmental problems such as fugitive dust and leachate, as well as economic issues resulting from the need to secure large-scale treatment facilities.

[0038] Accordingly, the inventors of the present invention have researched a method to replace existing spinning marble glass by manufacturing glass using blast furnace slag. Manufacturing glass fibers using blast furnace slag, an industrial byproduct, is economical due to its very low cost, and is also environmentally friendly as it allows for the recycling of waste resources.

[0039] Accordingly, in this invention, research was conducted on a marble glass manufacturing process suitable for producing slag fibers using blast furnace slag generated from steel slag, and an optimal content ratio capable of vitrification was derived by adding a glass raw material (E-glass) as an additive to the blast furnace slag.

[0041] To this end, the glass long fiber using blast furnace slag according to an embodiment of the present invention is formed by melting a mixture of blast furnace slag generated during the process of manufacturing pig iron in a blast furnace and glass raw materials, and comprises 30 to 70 weight% of blast furnace slag; and 70 to 30 weight% of glass raw materials.

[0042] Blast furnace slag is a byproduct generated during the process of manufacturing pig iron in a blast furnace at a steelworks. It is produced when SiO2, Al2O3, and other substances present in the ash of the main raw material (iron ore) and auxiliary raw materials (coke, limestone) react with lime at high temperatures.

[0043] More specifically, the blast furnace slag may contain 20 to 45 wt% CaO, 30.5 to 5 wt% Fe2O, 20.01 to 3 wt% MnO, 15 to 35 wt% SiO2, 10 to 25 wt% Al2O, 0.5 to 7 wt% MgO and 20.01 to 5 wt% TiO2 as its chemical composition.

[0044] In addition, the inventors of the present invention researched the possibility of using blast furnace slag as a raw material for glass by focusing on the fact that it is composed of inorganic materials such as SiO2 and Al2O3 and that its particle size is fine.

[0045] The glass raw material may contain 10 to 30 wt% CaO, 10 to 25 wt% SiO2, 5 to 15 wt% Al2O3, 0.1 to 5 wt% MgO and 0.1 to 5 wt% TiO2.

[0046] Here, CaO plays a role in increasing chemical resistance and lowering the melting point. If the CaO content is too low, the chemical resistance may be low. Therefore, considering the mixing ratio between the glass raw material and the blast furnace slag, it is preferable that the CaO content be 10 to 30 weight%, and more preferable that it be 15 to 25 weight%.

[0047] SiO2 is a glass-forming oxide and serves as a component for forming the glass framework. Furthermore, SiO2 is an effective component for improving resistance to devitrification, as controlling its content makes it easy to adjust the viscosity of the glass. If the SiO2 content is too low, resistance to devitrification may deteriorate and the refractive index may decrease, whereas if the SiO2 content is too high, the glass transition temperature (T g The viscosity of the glass is prone to increase, and undissolved substances are prone to occur. Therefore, considering the mixing ratio between the glass raw material and the blast furnace slag, it is preferable that the SiO2 content be 10 to 25 weight%, and more preferable that it be 15 to 20 weight%.

[0048] Al2O3 increases the glass transition temperature and softening point, but plays a role in enhancing chemical durability. If the Al2O3 content is too high, chemical durability increases but ultraviolet (UV) transmittance may be poor, and if the Al2O3 content is too low, ultraviolet (UV) transmittance improves but chemical durability may decrease. Therefore, considering the mixing ratio between the glass raw material and the blast furnace slag, it is preferable that the Al2O3 content be 5 to 15 weight%, and more preferable that it be 8 to 13 weight%.

[0049] Although MgO is an alkaline earth metal, it strengthens the durability of glass and raises its melting point due to the influence of single bond strength with oxygen and ion size. If the MgO content is too high, the melting point of the glass increases significantly, which may result in unmelted material; if the MgO content is too low, the effect of increasing durability obtained by the Mg-O bond strength may be negligible. Therefore, considering the mixing ratio between the glass raw material and blast furnace slag, it is preferable that the MgO content be 0.1 to 5 weight%, and more preferable that it be 0.2 to 3 weight%.

[0050] In addition, the glass raw material may further include one or more selected from K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

[0052] A glass long fiber using blast furnace slag according to an embodiment of the present invention comprises 30 to 70 weight% of blast furnace slag and 70 to 30 weight% of glass raw material. More preferably, a glass long fiber using blast furnace slag according to an embodiment of the present invention comprises 40 to 60 weight% of blast furnace slag and 60 to 40 weight% of glass raw material.

[0053] If the amount of blast furnace slag added is less than 30% by weight of the total weight of the glass long fiber, it is advantageous for vitrification, but the amount of blast furnace slag, an industrial byproduct, used is too small, which may make it difficult to achieve the purpose of recycling waste resources. Conversely, if the amount of blast furnace slag added exceeds 70% by weight of the total weight of the glass long fiber, there is a high risk that vitrification will not occur due to a decrease in SiO2 and Al2O3, which can form a glass structure, and a decrease in CaO and K2O, which play a role in lowering the melting temperature.

[0054] As such, the glass long fiber using blast furnace slag according to an embodiment of the present invention is formed by mixing blast furnace slag in an optimized range of 30 to 70 wt% and glass raw material in 70 to 30 wt%, and the glass long fiber comprises Al2O3 10 to 20 wt%, SiO2 20 to 40 wt%, CaO 20 to 45 wt%, Fe2O3 0.5 to 5 wt%, MnO2 0.1 to 3 wt%, MgO 0.1 to 5 wt%, and TiO2 0.1 to 5 wt%.

[0055] In addition, the glass long fiber may further include one or more of K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

[0057] As described above, the glass long fiber using blast furnace slag according to the embodiment of the present invention is the result of repeated research suitable for manufacturing slag fibers using blast furnace slag generated from steel slag, wherein an optimal content ratio capable of vitrification was derived by adding glass raw materials as additives to the blast furnace slag.

[0058] In this way, the glass long fiber using blast furnace slag according to the embodiment of the present invention can be vitrified by mixing blast furnace slag in an optimized range of 30 to 70 weight% and glass raw material in 70 to 30 weight%, thereby inducing an increase in the content of SiO2 and Al2O3, which can form a glass structure, and an increase in the content of CaO and K2O, which serve to lower the melting temperature, as the content of glass raw material (E-glass) increases.

[0059] As a result, the glass long fiber using blast furnace slag according to the embodiment of the present invention can prevent environmental pollution problems caused by the landfilling of blast furnace slag by recycling blast furnace slag, which is industrial waste, and can also produce the glass long fiber at a low cost, while also contributing to carbon neutrality.

[0061] Hereinafter, a method for manufacturing glass long fibers using blast furnace slag according to an embodiment of the present invention will be described with reference to the attached drawings.

[0062] FIG. 1 is a process flowchart showing a method for manufacturing glass long fibers using blast furnace slag according to an embodiment of the present invention.

[0063] As illustrated in FIG. 1, a method for manufacturing glass long fibers using blast furnace slag according to an embodiment of the present invention includes a mixing step (S110), a melting step (S120), a spinning step (S130), a cooling step (S140), a gathering step (S150), and a winding step (S160).

[0065] mix

[0066] In the mixing step (S110), blast furnace slag generated during the process of manufacturing pig iron in a blast furnace is mixed with glass raw materials.

[0067] In this step, it is preferable to mix 30 to 70 weight% of blast furnace slag and 70 to 30 weight% of glass raw materials, and more preferable to mix 40 to 60 weight% of blast furnace slag and 60 to 40 weight% of glass raw materials.

[0068] Blast furnace slag is a byproduct generated during the process of manufacturing pig iron in a blast furnace at a steelworks. It is produced when SiO2, Al2O3, and other substances present in the ash of the main raw material (iron ore) and auxiliary raw materials (coke, limestone) react with lime at high temperatures.

[0069] More specifically, the blast furnace slag may contain 20 to 45 wt% CaO, 30.5 to 5 wt% Fe2O, 20.01 to 3 wt% MnO, 15 to 35 wt% SiO2, 10 to 25 wt% Al2O, 0.5 to 7 wt% MgO and 20.01 to 5 wt% TiO2 as its chemical composition.

[0070] In addition, the inventors of the present invention researched the possibility of using blast furnace slag as a raw material for glass by focusing on the fact that it is composed of inorganic materials such as SiO2 and Al2O3 and that its particle size is fine.

[0071] The glass raw material may contain 10 to 30 wt% CaO, 10 to 25 wt% SiO2, 5 to 15 wt% Al2O3, 0.1 to 5 wt% MgO and 0.1 to 5 wt% TiO2.

[0072] Here, CaO plays a role in increasing chemical resistance and lowering the melting point. If the CaO content is too low, the chemical resistance may be low. Therefore, considering the mixing between the glass raw material and the blast furnace slag, the CaO content is preferably 10 to 30 weight%, and more preferably 15 to 25 weight%.

[0073] SiO2 is a glass-forming oxide and serves as a component for forming the glass framework. Furthermore, SiO2 is an effective component for improving resistance to devitrification, as controlling its content makes it easy to adjust the viscosity of the glass. If the SiO2 content is too low, resistance to devitrification may deteriorate and the refractive index may decrease, whereas if the SiO2 content is too high, the glass transition temperature (T g The viscosity of the glass is prone to increase, and undissolved substances are prone to occur. Therefore, considering the mixing ratio between the glass raw material and the blast furnace slag, it is preferable that the SiO2 content be 10 to 25 weight%, and more preferable that it be 15 to 20 weight%.

[0074] Al2O3 increases the glass transition temperature and softening point, but plays a role in enhancing chemical durability. If the Al2O3 content is too high, chemical durability increases but ultraviolet (UV) transmittance may be poor, and if the Al2O3 content is too low, ultraviolet (UV) transmittance improves but chemical durability may decrease. Therefore, considering the mixing ratio between the glass raw material and the blast furnace slag, it is preferable that the Al2O3 content be 5 to 15 weight%, and more preferable that it be 8 to 13 weight%.

[0075] Although MgO is an alkaline earth metal, it strengthens the durability of glass and raises its melting point due to the influence of single bond strength with oxygen and ion size. If the MgO content is too high, the melting point of the glass increases significantly, which may result in unmelted material; if the MgO content is too low, the effect of increasing durability obtained by the Mg-O bond strength may be negligible. Therefore, considering the mixing ratio between the glass raw material and blast furnace slag, it is preferable that the MgO content be 0.1 to 5 weight%, and more preferable that it be 0.2 to 3 weight%.

[0076] In addition, the glass raw material may further include one or more selected from K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

[0077] In this step, a dry mixing process may be used for mixing the blast furnace slag and the glass raw material. At this time, the dry mixing process may use one or more selected from a V-mixer, a 3D tumbling mixer, ball milling, attrition milling, etc.

[0078] For example, looking specifically at the ball milling process, blast furnace slag and glass raw materials are loaded into a ball milling machine and rotated at a constant speed to mechanically and uniformly mix the blast furnace slag and glass raw materials. The balls used for ball milling may be made of ceramics such as zirconia or alumina, and the balls may all have the same diameter or two or more balls with different diameters may be used together. Uniform mixing is achieved by adjusting the ball size, milling time, and the rotational speed per minute of the ball milling machine. For example, considering the particle size, the ball size can be set to a range of approximately 1 to 30 mm, and the rotational speed of the ball milling machine can be set to a range of approximately 50 to 500 rpm. It is preferable to perform ball milling for 1 to 48 hours. Through ball milling, the blast furnace slag and glass raw materials are ground into fine particles, achieve a uniform particle size distribution, and are uniformly mixed.

[0080] melting

[0081] In the melting step (S120), the mixed mixture is melted.

[0082] In this step, melting is achieved by placing a mixture of blast furnace slag and glass raw materials into a melting furnace and heating the furnace containing the mixture to melt the mixture, or by continuously supplying the mixture into the melting furnace and heating the continuously supplied mixture to melt it. Here, it is preferable that the melting furnace be made of a material having a high melting point, high strength, and a low contact angle to suppress the phenomenon of molten material sticking. To this end, the melting furnace may be made of materials such as platinum (Pt), AZS (Al2O3-ZrO2-SiO2-based) refractories, or chamotte, or its surface may be coated with a material such as platinum (Pt).

[0083] At this time, it is preferable to perform the melting at 1,400 to 1,850°C for 10 minutes to 24 hours, and more preferable to perform it at 1,500 to 1,700°C for 1 to 12 hours. If the melting temperature is below 1,400°C or the melting time is less than 10 minutes, the mixture may not be fully melted. Conversely, if the melting temperature exceeds 1,850°C or the melting time exceeds 24 hours, excessive energy consumption is required, making it uneconomical.

[0084] In addition, it is preferable that the heating rate of the melting furnace be 5 to 50°C. This is because if the heating rate of the melting furnace is too slow, it takes a long time and productivity decreases, and if the heating rate of the melting furnace is too fast, the amount of volatilization of the mixture increases due to the rapid rise in temperature, which may result in poor physical properties of the glass. It is preferable to perform this melting in an oxidizing atmosphere such as oxygen (O2) or air.

[0086] radiation

[0087] In the spinning step (S130), the molten material is spun into a thread shape using a bushing having a structure with multiple nozzle holes.

[0088] The molten material passes through a nozzle hole at the bottom of the bushing and is extruded in the form of a thin thread. In order to improve the shortened lifespan caused by cracking and sagging due to shrinkage and expansion caused by heat when used for a long time at high temperatures, it is preferable that the bushing be made of a material mixed with platinum (Pt) and rhodium (Rh).

[0089] It is desirable for the bushing to be made of a material that does not react at high temperatures and does not melt at the melting temperature, and in particular, it is desirable for the material to be an alloy of platinum (Pt) and rhodium (Rh) that does not react with oxygen and maintains strength at high temperatures. The alloy of platinum (Pt) and rhodium (Rh) may be an alloy in which platinum (Pt) and rhodium (Rh) are composed in a weight ratio of 70:30 to 90:10.

[0090] It is desirable for the bushing to have a trapezoidal cross-section in which the raw material input section is wide and narrows toward the bottom surface where the nozzle hole is located. This trapezoidal shape facilitates the smooth descent of the molten material and can also provide a constant temperature gradient to the bushing. If the length of the bushing nozzle is shortened, the cooling rate of the molten material decreases, which may cause the viscosity to drop and clump together in the surrounding nozzles; conversely, if the length of the bushing nozzle is extended, the cooling rate of the molten material increases, which may result in the disadvantage of being difficult to fiberize. Considering these factors, it is desirable for the length of the bushing nozzle to be 3 to 7 mm.

[0091] It is desirable to install a mesh screen inside the bushing. By installing a mesh screen, unmelted glass is filtered out, allowing only homogeneously melted molten material to pass through the bushing nozzle.

[0093] cooling

[0094] In the cooling step (S140), the molten material radiated in the form of a thread is cooled.

[0095] In this step, cooling can be performed on the molten material emitted through the nozzle using an air spray, a water spray, or a mixture thereof.

[0096] A sizing process may also be further performed on cooled, thread-shaped glass long fibers using a size applicator. The sizing process is carried out to evenly coat the surface of the glass long fibers with a size formula designed to protect the fibers during processing after the molten glass is fiberized, prevent fuzzing caused by breakage during handling after drying, and improve mechanical properties for composite material manufacturing.

[0097] Cooled glass long fibers in the form of threads can be coated with one or more materials selected from the group consisting of paraffin and starch using a size applicator. Silane, etc., may also be used as a material other than paraffin or starch. By coating the glass long fibers in the form of threads with a sizing agent such as paraffin or starch, friction caused by anti-static properties can be reduced, the glass long fibers can be softened, and functional properties can be improved by improving bonding with the resin used at the end.

[0099] Concentration

[0100] In the gathering step (S150), cooled glass long fibers in the form of threads are gathered through a gathering shoe.

[0101] The gathering shoe is configured to include two circular plates, and can be configured to gather and concentrate fibers between the circular plates.

[0103] Kwon Chi

[0104] In the winding step (S160), the bundled glass long fibers are wound.

[0105] In this step, it is preferable to wind the bundled glass long fibers at a speed of 500 to 2,500 rpm. The diameter of the glass long fibers produced can be determined according to this winding speed. If the winding speed is too slow, such as less than 500 rpm, it may be difficult to produce glass long fibers with an average diameter of 100 µm or less. Conversely, if the winding speed is too fast, such as exceeding 2,500 rpm, productivity increases, but there is a risk that the glass long fibers may break, so this is not desirable.

[0106] After this winding step (S160), the glass long fiber comprises 30 to 70 weight% of blast furnace slag and 70 to 30 weight% of glass raw material. More preferably, the glass long fiber comprises 40 to 60 weight% of blast furnace slag and 60 to 40 weight% of glass raw material. At this time, if the amount of blast furnace slag added is less than 30 weight% of the total weight of the glass long fiber, it is advantageous for vitrification, but the amount of blast furnace slag, an industrial byproduct, used is too small, so it may be difficult to achieve the purpose of recycling waste resources. Conversely, if the amount of blast furnace slag added exceeds 70 weight% of the total weight of the glass long fiber, there is a high risk that vitrification will not occur due to a decrease in SiO2 and Al2O3, which can form a glass structure, and a decrease in CaO and K2O, which play a role in lowering the melting temperature.

[0107] As such, the glass long fiber is formed by mixing blast furnace slag in an optimized range of 30 to 70 wt% and glass raw material in 70 to 30 wt%, and the glass long fiber comprises Al2O3 10 to 20 wt%, SiO2 20 to 40 wt%, CaO 20 to 45 wt%, Fe2O3 0.5 to 5 wt%, MnO2 0.1 to 3 wt%, MgO 0.1 to 5 wt%, and TiO2 0.1 to 5 wt%.

[0108] In addition, the glass long fiber may further include one or more of K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

[0109] With this, the method for manufacturing glass long fibers using blast furnace slag according to an embodiment of the present invention may be concluded.

[0111] As described above, the method for manufacturing glass long fibers using blast furnace slag according to the embodiment of the present invention is the result of repeated research suitable for manufacturing slag fibers using blast furnace slag generated from steel slag, in which an optimal content ratio capable of vitrification is derived by adding glass raw materials as additives to the blast furnace slag.

[0112] As such, the method for manufacturing glass long fibers using blast furnace slag according to an embodiment of the present invention enables vitrification by mixing blast furnace slag in an optimized range of 30 to 70 weight% and glass raw material in 70 to 30 weight%, thereby inducing an increase in the content of SiO2 and Al2O3, which can form a glass structure, and an increase in the content of CaO and K2O, which serve to lower the melting temperature, as the content of glass raw material (E-glass) increases.

[0113] As a result, the method for manufacturing glass long fibers using blast furnace slag according to the embodiment of the present invention can prevent environmental pollution problems caused by the landfilling of blast furnace slag by recycling blast furnace slag, which is industrial waste, and can also enable the low-cost production of glass long fibers while contributing to carbon neutrality.

[0115] Examples

[0116] Hereinafter, the structure and operation of the present invention will be explained in more detail through preferred embodiments of the present invention. However, these are presented as preferred examples of the present invention and should not be interpreted in any way as limiting the present invention.

[0117] Details not listed here can be sufficiently technically inferred by a person skilled in this field, so their explanation will be omitted.

[0119] 1. Melting characteristics of blast furnace slag raw materials

[0120] Figure 2 is a photograph showing blast furnace slag raw material obtained by crushing blast furnace slag, and Figure 3 is a schematic diagram of the process showing the manufacturing process of marble glass using blast furnace slag raw material.

[0121] As shown in Figures 1 and 2, 50g of blast furnace slag raw material was placed in an alumina crucible, melted at 1,600°C for 2 hours, poured into a carbon mold heated to 600°C, maintained at 600°C for 2 hours, and then furnace-cooled to produce marble glass.

[0123] Figure 4 is a graph showing the XRD phase analysis evaluation results of marble glass manufactured using blast furnace slag raw materials.

[0124] As shown in Figure 4, to confirm the amorphous phase of marble glass produced using blast furnace slag raw materials, an X-ray diffraction device was used to measure the 2θ = 10° ~ 80° range using a Cu-Ka tube at an acceleration voltage of 40K, an acceleration current of 20mA, and a scan speed of 5° / min.

[0125] Measurement results confirmed that the peaks of the marble glass produced using blast furnace slag raw materials exhibit a typical amorphous pattern with low intensity values ​​and high background intensity.

[0127] 2. Manufacturing and Characterization of Marble Glass by Adding Glass Raw Material (E-glass)

[0128] Table 1 shows a mixing arrangement of blast furnace slag and glass raw materials, Figure 5 is a photograph of glass raw materials that have been crushed, Figure 6 is a schematic diagram of the process for manufacturing marble glass using glass raw materials as additives to blast furnace slag, and Figure 7 is a photograph of marble glass manufactured by varying the content ratio of blast furnace slag to 50 to 90 wt% and glass raw materials (E-glass) to 10 to 50 wt%.

[0130] [Table 1]

[0131]

[0132] As shown in Table 1 and Figures 5 to 7, glass raw material (E-glass) was added in various content ratios to improve the meltability of blast furnace slag, and the vitrification range was confirmed accordingly.

[0133] To this end, blast furnace slag and glass raw materials were mixed in batches as shown in Table 1, placed in an alumina crucible, melted at 1,600°C for 2 hours, poured into a carbon mold heated to 600°C, maintained at 600°C for 2 hours, and then furnace-cooled to produce marble glass.

[0135] 3. Evaluation of Marble Glass Characteristics

[0136] Table 2 shows the results of the component analysis of marble glass produced by mixing 70 wt% blast furnace slag + 30 wt% glass raw material (E-glass) and 50 wt% blast furnace slag + 50 wt% glass raw material (E-glass), and Figure 8 is a graph showing the results of X-ray rotational analysis of marble glass produced by varying the content ratio of 50 to 90 wt% blast furnace slag and 10 to 50 wt% glass raw material (E-glass).

[0138] [Table 2]

[0139]

[0140] As shown in Table 2 and Figure 8, to confirm the amorphous phase of marble glass, an X-ray diffraction device was used to measure the 2θ = 10°–80° range using a Cu-Ka tube at an acceleration voltage of 40K, an acceleration current of 20mA, and a scan speed of 5° / min.

[0141] At this time, it was confirmed that the peak of the marble glass composition containing 50 to 90 wt% of blast furnace slag was a typical amorphous pattern with a low intensity value and a high background intensity.

[0142] As a result of conducting XRF (qualitative analysis) to identify the composition of the marble glass, it was confirmed that the main components of the marble glass mixed with 70 wt% blast furnace slag + 30 wt% glass raw material (E-glass) were Al2O3, SiO2, CaO, and a small amount of Fe2O3, and the main components of the marble glass mixed with 50 wt% blast furnace slag + 50 wt% glass raw material (E-glass) were also Al2O3, SiO2, CaO, and Fe2O3.

[0143] As can be seen from the experimental results above, as the content of the glass raw material (E-glass) increases, the amount of SiO2 and Al2O3 capable of forming a glass structure increases, and the amount of CaO and K2O that lower the melting temperature increases. Therefore, it was confirmed that vitrification is possible starting from the range of 70 wt% blast furnace slag + 30 wt% E-glass. Thus, it was proven that it is possible to manufacture blast furnace slag glass long fibers by controlling the SiO2 content in the glass raw material.

[0145] 4. Manufacture of Blast Furnace Slag Fibers

[0146] Figure 9 is a schematic diagram showing a laboratory fiber drawing device, and Figure 10 is a photograph showing the results of measuring the diameter of blast furnace slag fibers.

[0147] As shown in FIGS. 9 and 10, to confirm fiberization, a single fiber was produced using a laboratory fiber-pulling device (200) with a molten material composed of 70 wt% blast furnace slag + 30 wt% E-glass, and the possibility of fiberization was confirmed.

[0148] At this time, the laboratory fiber lifting device (200) includes a storage container (210), a fiber protection tube (220), a fiber support roller (230), a fiber driving roller (240), a fiber guide roller (250), and a fiber hanging roller (260). Here, a molten material (10) is filled inside the storage container (210), and a fiber protection tube (220) is mounted on the storage container (210) to protect the fiber (20) being lifted from the molten material (10). In addition, a fiber support roller (230) and a fiber driving roller (240) are mounted on the upper side of the fiber protection tube (220), and a fiber guide roller (250) and a fiber hanging roller (260) are mounted on the fiber support roller (230) and the fiber driving roller (240).

[0149] It was confirmed that the diameters of the blast furnace slag fibers (20) produced through this laboratory fiber-pulling device (200) were measured as 240㎛ and 478㎛, respectively, because the blast furnace slag fibers (20) are produced without controlling the winding speed.

[0150] Therefore, it is determined that if the winding speed is controlled, it is possible to manufacture blast furnace slag fibers (20) with various diameters ranging from 10 to 100 μm.

[0152] Although the present invention has been described above with reference to embodiments, various changes and modifications can be made by those skilled in the art to which the present invention pertains. Such changes and modifications are considered to be within the scope of the present invention as long as they do not depart from the technical concept provided by the present invention. Accordingly, the scope of rights of the present invention should be determined by the claims set forth below. Explanation of the symbols

[0154] S110: Mixing step S120: Melting stage S130: Radiation stage S140: Cooling stage S150: Focusing stage S160: Winding stage

Claims

Claim 1 A glass long fiber using blast furnace slag, formed by melting a mixture of blast furnace slag and glass raw materials generated during the process of manufacturing pig iron in a blast furnace, wherein the glass long fiber comprises 30 to 70 weight% of blast furnace slag; and 70 to 30 weight% of glass raw materials. Claim 2 Glass long fiber using blast furnace slag according to claim 1, characterized in that the blast furnace slag comprises, as a chemical composition, 20 to 45 wt% CaO, 30.5 to 5 wt% Fe2O, 20.01 to 3 wt% MnO, 15 to 35 wt% SiO2, 10 to 25 wt% Al2O, 0.5 to 7 wt% MgO and 20.01 to 5 wt% TiO2. Claim 3 Glass long fiber using blast furnace slag according to claim 1, characterized in that the glass raw material comprises 10 to 30 wt% CaO, 10 to 25 wt% SiO2, 5 to 15 wt% Al2O3, 0.1 to 5 wt% MgO, and 0.1 to 5 wt% TiO2. Claim 4 Glass long fiber using blast furnace slag according to claim 3, characterized in that the glass raw material further comprises one or more selected from K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%. Claim 5 A glass long fiber using blast furnace slag according to claim 1, characterized in that the glass long fiber comprises 40 to 60 weight% of blast furnace slag; and 60 to 40 weight% of glass raw material. Claim 6 Glass long fiber using blast furnace slag according to claim 1, characterized in that the glass long fiber comprises Al2O3 10 ~ 20 wt%, SiO2 20 ~ 40 wt%, CaO 20 ~ 45 wt%, Fe2O3 0.5 ~ 5 wt%, MnO2 0.1 ~ 3 wt%, MgO 0.1 ~ 5 wt%, and TiO2 0.1 ~ 5 wt%. Claim 7 Glass long fiber using blast furnace slag according to claim 6, characterized in that the glass long fiber further comprises one or more of K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%. Claim 8 (a) a step of mixing blast furnace slag generated during the process of manufacturing pig iron in a blast furnace with glass raw materials; (b) a step of melting the mixed mixture; (c) a step of spinning the molten material into a thread form using a bushing having a structure with a plurality of nozzle holes; (d) a step of cooling the molten material spun into a thread form; (e) a step of gathering the cooled thread-shaped glass long fibers through a gathering shoe; and (f) a step of winding the gathered glass long fibers; wherein, after step (f), the glass long fibers comprise 30 to 70 weight% of blast furnace slag; and 70 to 30 weight% of glass raw materials. Claim 9 A method for manufacturing glass long fibers using blast furnace slag according to claim 8, characterized in that the blast furnace slag comprises, as chemical components, 20 to 45 wt% CaO, 30.5 to 5 wt% Fe2O, 20.01 to 3 wt% MnO, 15 to 35 wt% SiO2, 10 to 25 wt% Al2O, 0.5 to 7 wt% MgO and 20.01 to 5 wt% TiO2. Claim 10 A method for manufacturing glass long fibers using blast furnace slag according to claim 8, characterized in that the glass raw material comprises 10 to 30 wt% CaO, 10 to 25 wt% SiO2, 5 to 15 wt% Al2O3, 0.1 to 5 wt% MgO, and 0.1 to 5 wt% TiO2. Claim 11 A method for manufacturing glass long fibers using blast furnace slag, characterized in that, in claim 10, the glass raw material further comprises one or more selected from K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%. Claim 12 A method for manufacturing glass long fibers using blast furnace slag, characterized in that, in step (f) of claim 8, the winding is performed at a speed of 500 to 2,500 rpm. Claim 13 A method for manufacturing glass long fibers using blast furnace slag, characterized in that, in claim 8, after step (f), the glass long fiber comprises 40 to 60 weight% of blast furnace slag; and 60 to 40 weight% of glass raw material. Claim 14 A method for manufacturing glass long fibers using blast furnace slag according to claim 8, wherein, after step (f), the glass long fiber comprises Al2O3 10 ~ 20 wt%, SiO2 20 ~ 40 wt%, CaO 20 ~ 45 wt%, Fe2O3 0.5 ~ 5 wt%, MnO2 0.1 ~ 3 wt%, MgO 0.1 ~ 5 wt%, and TiO2 0.1 ~ 5 wt%. Claim 15 A method for manufacturing glass long fibers using blast furnace slag, characterized in that, in claim 14, the glass long fiber further comprises one or more of K2O 0.05 to 5 wt%, SrO 0.05 to 3 wt%, and ZrO2 0.01 to 5 wt%.

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