Method for producing steel-making auxiliary material, and steel-making auxiliary material

Abstract

[Problem] To simultaneously achieve, in regard to a steel-making auxiliary material containing metal ash and / or a metal granular material: prevention of deterioration of working environment and deterioration of quality of a steel product due to components other than the metal ash or the like contained in the steel making auxiliary material; prevention of scattering of the metal ash or the like; and prevention of pulverization of the steel-making auxiliary material during production, transportation and use. [Solution] A method for producing a steel-making auxiliary material 1 according to the present invention comprises a step for storing metal ash 2 or the like in a metallic storage body, such as a metallic cylindrical storage body 3 or a metallic bag-like storage body 4 without adding a binder, and sealing the metallic storage body. In the steel-making auxiliary material 1 produced by the production method of the present invention, preferably, the metal ash or the like 2 is stored in the metallic storage body, the binder is not stored in the metallic storage body, and the metallic storage body is sealed. Further, preferably, only the metal ash or the like 2 is housed in the metallic storage body, and neither a label nor painting is applied to the surface of the metallic storage body.

Description

Manufacturing method of steelmaking auxiliary materials and steelmaking auxiliary materials

[0001] The present invention relates to a method for producing a steelmaking secondary material and a steelmaking secondary material.

[0002] Aluminum ash is a powdery substance that is generated during processes such as the heating and melting of metallic aluminum. It is composed of aluminum oxide, metallic aluminum, and aluminum nitride. It also contains metal oxides, chlorides, and fluorides derived from the elements that make up aluminum alloys. Aluminum ash is also known by several names, including aluminum dross, aluminum dross, aluminum dross residual ash, and aluminum residual ash. Aluminum ash contains metallic aluminum. Therefore, metallic aluminum is recovered from aluminum ash as needed, and secondary and tertiary aluminum ash is generated during this recovery process.

[0003] Most of the aluminum ash generated in Japan is ultimately used by steel manufacturers. This is because aluminum ash contains a certain amount of metallic aluminum. The metallic aluminum contained in aluminum ash is an inexpensive secondary material that is effective as a heat source in the steelmaking process, utilizing the exothermic reaction between metallic aluminum and oxygen, and for removing oxygen from molten steel (deoxidation). In addition, aluminum oxide (alumina), which is produced by the reaction between metallic aluminum and oxygen, and the alumina originally contained in aluminum ash, are used as raw materials for slag in the steelmaking process.

[0004] There are two ways to use aluminum ash in the steelmaking process: using the aluminum ash as powder, or using a product made by granulating the aluminum ash with an appropriate binder.

[0005] Using aluminum as a powder simplifies the secondary material manufacturing process because it does not require granulation or compression. However, when using aluminum as a powder, aluminum ash is prone to scattering as dust during the steelmaking process. Therefore, using aluminum as a powder has the disadvantage of resulting in a lower yield, a worsening working environment, and an increase in steelmaking dust.

[0006] The method of solidifying powdered aluminum ash using a binder can prevent the aluminum ash from scattering as dust during use. The binder may be polyvinyl alcohol, carboxymethyl cellulose, starch, pitch, tar, polystyrene, polyethylene, polyurethane, epoxy resin, phenolic resin, slaked lime, quicklime, water, or the like, either singly or in combination, and is generally kneaded and compressed, and heated as necessary (Patent Documents 1, 2, 3, and 4).

[0007] Japanese Patent Application Laid-Open No. 2004-190069 Japanese Patent Application Laid-Open No. 2002-18412 Japanese Patent Application Laid-Open No. 2002-194416 Japanese Patent Application Laid-Open No. 6-299217

[0008] However, organic compound-based binders burn during the steelmaking process, generating smoke. In the case of binders containing inorganic compounds, the water solvent reacts with aluminum nitride in aluminum ash during the secondary material manufacturing process, generating ammonia, which has a strong, foul odor. Furthermore, since it is desirable for the binder to be uniformly dispersed among the aluminum ash particles, it is desirable for the binder to be in the form of a liquid or fine powder. Therefore, methods that use binders require the use of organic solvents and / or fine powders that are prone to scattering, for example, to increase the binder's fluidity. All of these factors worsen the working environment during the steelmaking and secondary material manufacturing processes.

[0009] Furthermore, some binders are expensive raw materials. Among binders, those that require heating require high frictional heat during the secondary material manufacturing process. These binders result in high costs.

[0010] Furthermore, because it is not possible to completely prevent the aluminum ash from being pulverized, there is a risk that the aluminum ash will return to powder due to collisions or other factors during the secondary material manufacturing, transportation, and use. This leads to a decrease in product yield and the addition of a cleaning and removal process for the pulverized aluminum ash.

[0011] Some binders contain steel impurities such as sulfur, which can not only worsen the working environment but also reduce the quality of steel products.

[0012] The present invention has been made in view of the above circumstances, and its problems are as follows: (1) Deterioration of the working environment in the process of manufacturing secondary materials using aluminum ash as a raw material and in the steelmaking process when the secondary materials are used. (2) Reduction in the yield of use due to scattering, etc. in the steelmaking process when secondary materials are used. (3) Reduction in the product yield due to powdering, etc. in the secondary material manufacturing process, transportation process, and use process.

[0013] As a result of extensive research into solving the above-mentioned problems, the inventors discovered that the above-mentioned object can be achieved by storing aluminum ash in a metal container without adding a binder and then sealing the metal container containing the aluminum ash. They also discovered that this method can be applied not only to aluminum ash but also to various metal ash and / or metal particles such as electric furnace dust (powders containing FeO, ZnO, etc.) and metal chips (aluminum chips, cutting chips of iron, etc.), and thus completed the present invention. Specifically, the present invention provides the following:

[0014] A first aspect of the present invention provides a method for producing steelmaking secondary materials, including the steps of containing metal ash and / or metal particles in a metal container without adding a binder, and sealing the metal container.

[0015] According to the first aspect of the present invention, metal ash and / or metal particles are contained in a metal container, and the metal container containing the metal ash and / or metal particles is sealed. This prevents the metal ash and / or metal particles from scattering, and also prevents a decrease in product yield due to powdering or the like during the manufacturing process, transportation process, and / or use process of the steelmaking secondary material.

[0016] According to the first feature of the invention, since no binder is added to the metal ash and / or metal particles contained in the metal container, it is possible to prevent components other than the metal ash and / or metal particles contained in the steelmaking secondary materials from scattering during the steelmaking process when the secondary materials are used, thereby preventing a decrease in usage yield.

[0017] For example, scattering of metal ash and / or metal particles can be prevented by storing metal ash and / or metal particles in a non-metallic container made of non-metals such as resin, wood, natural fibers, etc., and sealing the container. However, in the method of storing metal ash and / or metal particles in a non-metallic container and sealing the container, the non-metals that make up the non-metallic container burn during steelmaking, generating smoke, which can worsen the working environment and lead to a deterioration in the quality of steel products.

[0018] According to the first aspect of the invention, a metal container is used to store metal ash and / or metal particles, which prevents smoke from being generated from the container and prevents deterioration of the working environment in the secondary material manufacturing process using metal ash and / or metal particles as raw materials, and in the steelmaking process when the secondary materials are used.

[0019] Therefore, according to the invention relating to the first feature, the following problems can be solved: (1) a deterioration of the working environment in the secondary material manufacturing process using metal ash and / or metal granules as raw materials and in the steelmaking process when the secondary materials are used; (2) a decrease in usage yield due to scattering, etc. in the steelmaking process when the secondary materials are used; and (3) a decrease in product yield due to powdering, etc. in the secondary material manufacturing process, transportation process, and usage process.

[0020] The invention relating to the second feature is in a different category from the invention relating to the first feature.

[0021] The third aspect of the invention is the second aspect of the invention, wherein the metal container contains only the metal ash and / or the metal particles.

[0022] According to the third feature of the invention, since only metal ash and / or the metal particles are contained in the metal container, it is possible to further prevent the working environment in the steelmaking process when the secondary materials are used from deteriorating due to components other than metal ash and / or the metal particles contained in the steelmaking secondary materials.

[0023] Therefore, according to the invention relating to the third feature, the following problems can be solved: (1) a deterioration of the working environment in the secondary material manufacturing process using metal ash and / or the metal granules as raw materials, and in the steelmaking process when the secondary materials are used; (2) a decrease in usage yield due to scattering, etc. in the steelmaking process when the secondary materials are used; and (3) a decrease in product yield due to powdering, etc. in the secondary material manufacturing process, transportation process, and usage process.

[0024] A fourth aspect of the invention provides a steelmaking secondary material according to the second or third aspect of the invention, in which neither a label nor paint is attached to the surface of the metal container.

[0025] According to the fourth feature of the invention, since the surface of the metal container is neither labeled nor painted, it is possible to prevent the paint, labels, and / or adhesives used in labeling from burning and generating smoke, which would otherwise deteriorate the working environment in the steelmaking process when using secondary materials.

[0026] Therefore, according to the invention relating to the fourth feature, the following problems can be solved: (1) a deterioration of the working environment in the secondary material manufacturing process using metal ash and / or the metal granules as raw materials, and in the steelmaking process when the secondary materials are used; (2) a decrease in usage yield due to scattering, etc. in the steelmaking process when the secondary materials are used; and (3) a decrease in product yield due to powdering, etc. in the secondary material manufacturing process, transportation process, and usage process.

[0027] The present invention can solve the following problems (1) to (3): (1) Deterioration of the working environment in the process of manufacturing secondary materials using metal ash and / or the metal granules as raw materials, and in the steelmaking process when the secondary materials are used; (2) Reduction in the yield of use due to scattering, etc. in the steelmaking process when the secondary materials are used; (3) Reduction in the product yield due to powdering, etc. in the secondary material manufacturing process, transportation process, and use process.

[0028] Fig. 1 is a schematic side view showing an example of a steelmaking secondary material 1 according to this embodiment. Fig. 2 is a schematic plan view of the steelmaking secondary material 1. Fig. 3 is a schematic view showing another example of the steelmaking secondary material 1 according to this embodiment. Fig. 4 is a cross-sectional view taken along line A-A in Fig. 2.

[0029] An example of a preferred embodiment of the present invention will be described below with reference to the drawings. Note that this is merely an example, and the technical scope of the present invention is not limited to this example.

[0030] <Method for manufacturing steelmaking secondary material 1> The method for manufacturing steelmaking secondary material 1 in this embodiment includes at least a storage step of storing metal ash and / or metal particles 2 in a metal storage body, and a sealing step of sealing the metal storage body that stores the metal ash and / or metal particles 2.

[0031] Furthermore, the method for producing the steelmaking secondary material 1 in this embodiment preferably further includes a pressure molding step of pressure molding the metal ash and / or metal granules 2 contained in the metal container. By including the pressure molding step in the method for producing the steelmaking secondary material 1 in this embodiment, the specific gravity of the steelmaking secondary material 1 can be increased, and the weight per volume of the metal ash and / or metal granules 2 contained in the steelmaking secondary material 1 can be increased. Furthermore, pressure molding can be expected to further adhere the powder constituting the metal ash and / or metal granules 2, preventing the metal ash and / or metal granules 2 from scattering.

[0032] In this embodiment, the term "metal ash" refers to a substance remaining after burning metal, and the term "metal particulate matter" refers to a substance including not only metal powder but also cylindrical, elliptical, or other shaped metal pellets and metal chips.

[0033] In the following, the metal ash and / or metal particulate material 2 will be described as aluminum ash 2 as a representative example, but it is not intended to limit the metal ash and / or metal particulate material to aluminum ash. In addition to aluminum ash, the metal ash and / or metal particulate material includes, for example, the following: Electric furnace dust (powders containing FeO, ZnO, etc.) Metal cuttings (including not only aluminum cuttings but also cuttings of iron, etc.) Calcium oxide (CaO: raw material for steelmaking slag, mainly powder) Other steelmaking secondary materials (including mainly chips and flakes of ferrosilicon, ferronickel, etc., carbon powder, granular carbon, etc.) Other slag raw materials (SiO ２ , Al ２ O ３Other fluxes (Chloride and fluoride powders are packed and put into aluminum melting furnaces, not steelmaking electric furnaces)

[0034] [Storage Step] The storage step is a step of storing the aluminum ash 2 in a metal storage body. Since the aluminum ash 2 is stored in the metal storage body in the steelmaking secondary material 1, the storage body is prevented from burning and generating smoke, and it is possible to prevent a deterioration in the working environment in the steelmaking process when the secondary material is used and / or a decrease in the usage yield due to scattering or the like in the steelmaking process when the secondary material is used.

[0035] Since the manufacturing method of the steelmaking secondary material 1 in this embodiment includes a storage step, scattering and / or powdering of the aluminum ash 2 can be prevented without adding a binder to the aluminum ash 2 to solidify the powdered aluminum ash 2.

[0036] [Aluminum ash 2] The aluminum ash 2 is not particularly limited as long as it is powdery aluminum ash generated when metallic aluminum and / or its alloy is heated and melted. Aluminum ash 2 is also called aluminum dross, aluminum dross residual ash, aluminum residual ash, etc., and contains aluminum oxide, metallic aluminum, and / or aluminum nitride, etc. Furthermore, aluminum ash 2 may contain oxides, chlorides, and / or fluorides, etc., of the various elements that constitute the aluminum alloy.

[0037] Since the aluminum ash 2 is contained in a metal container in the steelmaking secondary material 1, the steelmaking secondary material 1 containing the aluminum ash 2 can be added as a secondary material in steelmaking and used as a deoxidizer and / or a heating agent, etc. The steelmaking secondary material 1 containing the aluminum ash 2 added as a secondary material acts as a deoxidizer and removes excess oxygen contained in molten pig iron, molten steel, etc. Furthermore, the steelmaking secondary material 1 containing the aluminum ash 2 added as a secondary material acts as a heating agent and can increase the temperature in the steelmaking process.

[0038] The cost-effectiveness of steelmaking is improved by storing and using aluminum ash 2 generated during processes such as the heating and melting of metallic aluminum and / or aluminum alloys in the steelmaking secondary material 1. Furthermore, by storing aluminum ash 2 in the steelmaking secondary material 1 and effectively utilizing it as a secondary material for steelmaking, the amount of aluminum ash 2 disposed of can be reduced, and the environmental burden caused by the aluminum ash 2 can be alleviated.

[0039] [Metallic Container] The metallic container is not particularly limited as long as it can contain aluminum ash 2 .

[0040] The material of the metal container preferably contains a metal and / or its alloy having the same chemical formula as the metal constituting the metal ash and / or metal particles. For example, when the metal ash and / or metal particles are aluminum ash, the material of the metal container preferably contains metallic aluminum and / or an aluminum alloy. The metallic aluminum and / or aluminum alloy contains aluminum that contributes to the steelmaking process, just like the aluminum ash 2. Therefore, by using a metal container containing metallic aluminum and / or an aluminum alloy, the manufacturing method of the embodiment can further increase the amount of aluminum that contributes to the steelmaking process.

[0041] In the steelmaking secondary material 1 used in the steelmaking process, the material of the metal container may contain an iron-based material. This allows the steelmaking process to be carried out using the iron-based material contained in the metal container. This allows the manufacturing method of the embodiment to increase the amount of steel or the like obtained in the steelmaking process.

[0042] The material of the metal container preferably does not contain any material that becomes an impurity in the steelmaking process. Examples of materials that become impurities in the steelmaking process include copper, tin, zinc, lead, etc. By not containing any material that becomes an impurity in the steelmaking process, the risk of the quality of the steel or the like obtained in the steelmaking process being reduced by the material that becomes an impurity can be reduced.

[0043] The metal container preferably has neither a label nor a paint on its surface, which prevents the paint, label, and / or adhesives and glues used for labeling from burning and generating smoke, which can worsen the working environment in the steelmaking process when using secondary materials, and can prevent the secondary materials from scattering and reducing the yield in the steelmaking process when using secondary materials.

[0044] The metal container may be made of scrap metal material. By using scrap metal material for the metal container, scrap metal material that is to be disposed of and / or recycled can be effectively utilized as a metal container for the steelmaking secondary material 1. This reduces the amount of scrap metal material that is to be disposed of and / or recycled, thereby reducing the environmental load and / or recycling costs caused by the scrap metal material.

[0045] When the metal container is a metal container made of scrap metal, the scrap metal is preferably scrap metal from which labels and / or paint have been removed. By using a metal container made of scrap metal from which labels and / or paint have been removed, it is possible to effectively utilize the scrap metal while preventing the paint, labels, and / or adhesives used for label attachment from burning and generating smoke, which could worsen the working environment and reduce the yield of secondary materials due to scattering in the steelmaking process when they are used.

[0046] Below, we will use as examples a metallic cylindrical container 3 having a cylindrical shape and a metallic bag-shaped container 4 having a bag-like shape, but the shape of the metallic container is not particularly limited as long as it is capable of containing aluminum ash 2, and it may be any of the various shapes that conventional containers can take, such as various hollow cylinders exemplified by hollow rectangular parallelepipeds, hollow polyhedrons, hollow spheres, hollow cones, etc.

[0047] (Metallic cylindrical container 3) Fig. 1 is a schematic side view showing an example of a steelmaking secondary material 1 according to this embodiment. Fig. 2 is a schematic plan view of the steelmaking secondary material 1. The metallic container is preferably a metallic cylindrical container 3 including a container body 31 having an opening and a container lid 32 capable of sealing the opening.

[0048] By using the metal container as the tubular metal container 3, it is possible to prevent the shape of the tubular metal container 3 from changing during transportation, storage, and use of the metal container, which can facilitate transportation, storage, and use of the metal container.

[0049] The metal container is a metal cylindrical container 3 that includes a container body 31 having an opening and a container lid 32 that can seal the opening, so that after aluminum ash 2 is placed in the container body 31 through the opening, the metal cylindrical container 3 can be sealed using the container lid 32.

[0050] The materials of the metallic cylindrical container 3, the container body 31, and the container lid 32 may be the same as the materials of the metallic container described above.

[0051] The lower limit of the thickness of the side surface of the container body 31 is preferably 0.1 mm or more, more preferably 0.2 mm or more, and even more preferably 0.5 mm or more. By setting the lower limit of the thickness of the side surface of the container body 31 as described above, the risk of damage and / or deformation of the container body 31 during transportation, storage, and use of the steelmaking secondary material 1 can be reduced. This can further prevent a decrease in product yield due to powdering, etc., during the steelmaking secondary material manufacturing process, transportation process, and use process.

[0052] The upper limit of the thickness of the side surface of the container body 31 is preferably 2.0 mm or less, more preferably 1.0 mm or less, and even more preferably 0.7 mm or less. By setting the upper limit of the thickness of the side surface of the container body 31 as described above, a high proportion of aluminum ash 2 in the steelmaking secondary material 1 can be maintained. Furthermore, the time required for the metal cylindrical container 3 to melt in the steelmaking process using the steelmaking secondary material 1 can be shortened, thereby shortening the time required for the contained aluminum ash 2 to contribute to the steelmaking process.

[0053] The container lid 32 is preferably configured to include a substantially flat metal plate, such as an aluminum plate, an iron plate, etc. This can increase the stability when stacking the metal cylindrical containers 3.

[0054] The opening area of ​​the opening of the container body 31 is preferably smaller than the planar projection area of ​​the metal cylindrical container 3 when the metal cylindrical container 3 is placed with the opening facing up. By making the opening area of ​​the opening smaller than the planar projection area, scattering of the contained aluminum ash 2 through the opening can be reduced.

[0055] When the metallic cylindrical container 3 is placed with the opening facing up, the upper limit of the ratio of the opening area of ​​the opening to the planar projected area of ​​the metallic cylindrical container 3 is preferably 90% or less, more preferably 81% or less, and even more preferably 73% or less. By setting the upper limit of the ratio of the opening area of ​​the opening to the planar projected area as described above, it is possible to further reduce scattering of the aluminum ash 2 contained in the container through the opening during the container step.

[0056] When the metallic cylindrical container 3 is placed with the opening facing up, the lower limit of the ratio of the opening area of ​​the opening to the planar projected area of ​​the metallic cylindrical container 3 is preferably 9% or more, more preferably 16% or more, and even more preferably 25% or more. By setting the lower limit of the ratio of the opening area of ​​the opening to the planar projected area as described above, it can be made even easier to store the aluminum ash 2 in the container body 31 through the opening.

[0057] The metallic cylindrical container 3 preferably has neither labels nor paint on the surfaces of the container body 31 nor the container lid 32. By using a metallic cylindrical container 3 having neither labels nor paint on the surface, it is possible to prevent paint, labels, and / or adhesives and glues used for labeling from burning and generating smoke, which could worsen the working environment in the steelmaking process when secondary materials are used, and reduce the yield rate due to scattering or the like in the steelmaking process when secondary materials are used.

[0058] The metallic tubular container 3 may be manufactured using a plate material such as aluminum. By manufacturing the metallic tubular container 3 using a plate material such as aluminum, the manufacturing method of the embodiment can manufacture the metallic tubular container 3 more easily than by casting or the like.

[0059] The metallic tubular container 3 may be made of scrap metal cans, such as used aluminum cans and steel cans. By using scrap metal cans as the metallic tubular container 3, the scrap metal cans that are to be disposed of and / or recycled can be effectively utilized as the metallic tubular container 3 of the steelmaking secondary material 1. This reduces the amount of scrap metal cans that are to be disposed of and / or recycled, thereby reducing the environmental load and / or recycling costs caused by the scrap metal cans.

[0060] Furthermore, since the metallic cylindrical container 3 is made of a waste metal can, the metallic container can be obtained without processing a metal plate or the like into a cylindrical shape, thereby reducing various costs and / or environmental loads that arise when processing a metal plate or the like into the metallic cylindrical container 3.

[0061] When the metallic tubular container 3 is a metallic tubular container 3 made from scrap metal cans, the scrap metal cans are preferably scrap metal cans from which labels and / or paint have been removed. By using the metallic tubular container 3 made from scrap metal cans from which labels and / or paint have been removed, it is possible to effectively utilize the scrap metal cans and prevent the paint, labels, and / or adhesives used for label attachment from burning and generating smoke, which could worsen the working environment in the steelmaking process when secondary materials are used, and reduce the usage yield due to scattering, etc. in the steelmaking process when secondary materials are used.

[0062] 1, the surface of the container body 31 of the metal cylindrical container 3 is neither labeled nor painted, which prevents paint, labels, and / or adhesives and glues used for labeling from burning and generating smoke, which can be prevented from scattering during the steelmaking process when using secondary materials, thereby reducing the yield of the materials.

[0063] 2, the upper part of the container body 31 and the container lid 32 of the metal cylindrical container 3 are neither labeled nor painted on their surfaces, which prevents paint, labels, and / or adhesives and glues used for labeling from burning and generating smoke, which can worsen the working environment in the steelmaking process when secondary materials are used, and can prevent the secondary materials from scattering and reducing the yield in the steelmaking process when secondary materials are used.

[0064] (Metallic bag-shaped container 4) Fig. 3 is a schematic diagram showing another example of the steelmaking secondary material 1 according to this embodiment. The metallic container is preferably a metallic bag-shaped container 4 having an opening.

[0065] Since the metal container is the metal bag-shaped container 4, the shape of the metal bag-shaped container 4 can be changed during transportation, storage, and use of the metal container, which can facilitate transportation, storage, and use of the metal container.

[0066] The method for manufacturing the metallic bag-shaped container 4 is not particularly limited, and it may be manufactured using a foil (film) of aluminum or the like, for example.

[0067] The metallic bag-shaped container 4 may include a container sealing portion 41 that can seal the metallic bag-shaped container 4. This allows the metallic bag-shaped container 4 to be sealed using the container sealing portion 41 in a sealing step described below.

[0068] The material of the metallic bag-shaped container 4 and the container sealing portion 41 may be the same as the material of the metallic container described above.

[0069] The lower limit of the thickness of the metallic bag-shaped container 4 is preferably 0.1 mm or more, more preferably 0.2 mm or more, and even more preferably 0.5 mm or more. By setting the lower limit of the thickness of the metallic bag-shaped container 4 as described above, the risk of damage to the metallic bag-shaped container 4 during transportation, storage, and use of the steelmaking secondary material 1 can be reduced. This can further prevent a decrease in product yield due to powdering, etc., during the secondary material manufacturing process, transportation process, and use process of the steelmaking secondary material 1.

[0070] The upper limit of the thickness of the metal bag-shaped container 4 is preferably 2.0 mm or less, more preferably 1.0 mm or less, and even more preferably 0.7 mm or less. By setting the upper limit of the thickness of the metal bag-shaped container 4 as described above, a high proportion of aluminum ash 2 in the steelmaking secondary material 1 can be maintained. Furthermore, the time required for the metal bag-shaped container 4 to melt in the steelmaking process using the steelmaking secondary material 1 can be shortened, thereby shortening the time required for the contained aluminum ash 2 to contribute to the steelmaking process.

[0071] 3, the metal bag-shaped container 4 has a container sealing portion 41 that can seal the metal bag-shaped container 4. This allows the metal bag-shaped container 4 to be sealed using the container sealing portion 41 in a sealing step that will be described later.

[0072] [Other Containers] The metal container preferably contains aluminum ash 2 to which no binder has been added, which can further prevent deterioration of the working environment and / or deterioration of the quality of steel products due to the binder contained in the steelmaking secondary material 1.

[0073] It is preferable that the metal container does not contain any materials other than the binder that would become impurities in the steelmaking process. Examples of materials that become impurities in the steelmaking process include copper, tin, zinc, lead, etc. By not containing any materials that become impurities in the steelmaking process in the metal container, the risk of the quality of the steel or the like obtained in the steelmaking process being reduced by the impurity materials can be reduced.

[0074] It is preferable that the metal container contains only aluminum ash 2. This makes it possible to further prevent deterioration of the working environment and / or deterioration of the quality of steel products due to components other than aluminum ash 2 contained in the steelmaking secondary material 1.

[0075] [Sealing Step] The sealing step is not particularly limited as long as it is a step of sealing the metal container that contains the aluminum ash 2 .

[0076] When the metal container is a metal cylindrical container 3 including a container body 31 and a container lid 32, the sealing step preferably includes a step of sealing an opening provided in the container body 31 with the container lid 32. In this way, after the aluminum ash 2 is contained in the container body 31 through the opening, the metal cylindrical container 3 can be sealed using the container lid 32.

[0077] When the sealing step includes a step of sealing the opening provided in the container body 31 with the container lid 32, the sealing step may also include a step of fixing the container lid 32 to the container body 31. This more reliably seals the metal cylindrical container 3, and can further prevent the aluminum ash 2 from scattering. There is no particular limitation on the means for fixing the container lid 32 to the container body 31.

[0078] Figure 4 is a cross-sectional view taken along the line A-A in Figure 2. In Figure 4, aluminum ash 2 is contained within a container body 31. Also, in Figure 4, an opening at the top of the container body 31 is sealed with a container lid 32. This prevents the aluminum ash 2 from scattering. Furthermore, because the aluminum ash 2 is contained within the container body 31 and the metallic cylindrical container 3 containing the aluminum ash 2 is sealed, it is possible to prevent a decrease in product yield due to powdering or the like during the manufacturing process, transportation process, and / or use process of the steelmaking secondary material 1.

[0079] When the metal container is a metal bag-shaped container 4 having a container sealing part 41 capable of sealing the metal bag-shaped container 4, the sealing step preferably includes a step of sealing the opening of the metal bag-shaped container 4 with the container sealing part 41. In this way, after the aluminum ash 2 is contained in the metal bag-shaped container 4 through the opening, the metal bag-shaped container 4 can be sealed using the container sealing part 41.

[0080] [Pressure Molding Step] The pressure molding step is not particularly limited as long as it is a step of pressure molding the aluminum ash 2 contained in the metal container.

[0081] An example of the pressure molding process is a process in which pressure is applied from the outside to a metal cylindrical container 3 and / or a metal bag-shaped container 4 that contains and seals aluminum ash 2, thereby pressure molding the aluminum ash 2.

[0082] The lower limit of the pressure applied to the aluminum ash 2 or the like during pressure molding is preferably 20 MPa or more, more preferably 25 MPa or more, and even more preferably 30 MPa or more.

[0083] By determining the lower limit of the pressure to be applied to the aluminum ash 2, etc. during pressure molding as described above, the manufacturing process according to the embodiment can further increase the specific gravity of the steelmaking secondary material 1 and further increase the weight per volume of the aluminum ash 2 contained in the collected steelmaking secondary material 1.

[0084] Furthermore, by setting the lower limit of the pressure applied to the aluminum ash 2, etc. during pressure molding as described above, the powder constituting the aluminum ash 2 can be more closely adhered, and the effect of preventing the aluminum ash 2 from scattering can be expected to be even greater.

[0085] In this embodiment, the pressure applied to the aluminum ash 2 or the like during pressure molding refers to a value measured with a pressure gauge manufactured by Riken Kiki Co., Ltd.

[0086] The lower limit of the specific gravity of the steelmaking secondary material 1 after the pressure-forming process is preferably 1.0 or more, more preferably 1.2 or more, and even more preferably 1.5 or more. By setting the lower limit of the specific gravity of the steelmaking secondary material 1 after the pressure-forming process as described above, the steelmaking secondary material 1 can easily come into contact with molten iron and / or molten slag in the steelmaking process without scattering, and more aluminum ash 2 can be used as a secondary material without scattering. This allows the reaction between metallic aluminum and oxygen to occur more efficiently. This also allows aluminum oxide to be supplied to the slag more efficiently.

[0087] In this embodiment, specific gravity refers to a value calculated from the mass measured using an electronic balance manufactured by A&D Co., Ltd. and the volume measured using a tape measure with a volume measurement function.

[0088] The lower limit of the weight of the steelmaking secondary material 1 after the pressure-forming process is preferably 100 g or more, more preferably 200 g or more, and even more preferably 500 g or more. By setting the lower limit of the weight of the steelmaking secondary material 1 after the pressure-forming process as described above, the steelmaking secondary material 1 is more likely to come into contact with molten iron and / or molten slag in the steelmaking process without scattering. This allows more aluminum ash 2 to be used as a secondary material without scattering. This allows the reaction between metallic aluminum and oxygen to occur more efficiently. This also allows aluminum oxide to be supplied to the slag more efficiently.

[0089] [Steelmaking Subsidiary Material 1] By the manufacturing process according to the embodiment, a steelmaking secondary material 1 containing aluminum ash 2 but not containing a binder is obtained.

[0090] The appearance of the steelmaking auxiliary material 1 varies depending on the type of metal container. For example, in a steelmaking auxiliary material 1 in which the metal container is a metal cylindrical container 3, the aluminum ash 2 is cylindrical and surrounded by a metal plate and lid, and in a steelmaking auxiliary material 1 in which the metal container is a metal bag-shaped container 4, the aluminum ash 2 is bag-shaped and surrounded by metal foil.

[0091] The lower limit of the weight of the steelmaking secondary material 1 is preferably 100 g or more, more preferably 200 g or more, and even more preferably 500 g or more. By setting the lower limit of the weight of the steelmaking secondary material 1 as described above, the steelmaking secondary material 1 is more likely to come into contact with molten iron and / or molten slag in the steelmaking process. This allows more aluminum ash 2 to be used as a secondary material without scattering. This allows the reaction between metallic aluminum and oxygen to occur more efficiently. This also allows aluminum oxide to be supplied to the slag more efficiently.

[0092] The lower limit of the specific gravity of the steelmaking secondary material 1 is preferably 1.0 or more, more preferably 1.2 or more, and even more preferably 1.5 or more. By setting the lower limit of the specific gravity of the steelmaking secondary material 1 as described above, the steelmaking secondary material 1 is more likely to come into contact with molten iron and / or molten slag in the steelmaking process, and more aluminum ash 2 is utilized as a secondary material without scattering. This allows the reaction between metallic aluminum and oxygen to proceed more efficiently. This also allows aluminum oxide to be supplied to the slag more efficiently.

[0093] The cost-effectiveness of steelmaking can be improved by using aluminum ash 2 generated during processes such as the heating and melting of metallic aluminum and / or aluminum alloys as a secondary material in steelmaking. Furthermore, by effectively utilizing aluminum ash 2 as a secondary material in steelmaking, the amount of aluminum ash 2 disposed of can be reduced, thereby mitigating the environmental burden caused by the aluminum ash 2.

[0094] Furthermore, aluminum oxide (also referred to as "alumina") produced by the reaction of metallic aluminum contained in the aluminum ash 2 with oxygen, and the alumina originally contained in the aluminum ash 2, are used as raw materials for slag in the steelmaking process. The slag can be used as aggregate for concrete, etc.

[0095] However, if aluminum ash 2 is used in its powder form as a secondary material in steelmaking, the aluminum ash 2 may scatter as dust. This may reduce the rate at which the aluminum ash 2 is effectively utilized as a secondary material. Furthermore, there is a risk that the scattered dust may worsen the working environment and / or increase steelmaking dust.

[0096] In the steelmaking secondary material 1 manufactured by the manufacturing process according to the embodiment, the aluminum ash 2 is contained in a metal container, and the metal container containing the aluminum ash 2 is sealed, so the contained aluminum ash 2 does not spill out of the container, preventing scattering of the aluminum ash 2. Furthermore, because the aluminum ash 2 is contained in a metal container, and the metal container containing the aluminum ash 2 is sealed, it is possible to prevent a decrease in product yield due to powdering or the like during the manufacturing process, transportation process, and / or use process of the steelmaking secondary material 1.

[0097] To prevent the aluminum ash 2 from scattering as dust, one method involves kneading various binders with the aluminum ash 2, compressing the mixture, and, if necessary, heating it to form granules. Examples of binders include polyvinyl alcohol, carboxymethyl cellulose, starch, pitch, tar, polystyrene, polyethylene, polyurethane, epoxy resin, phenolic resin, slaked lime, quicklime, water, and / or mixtures of two or more of these. The method of kneading the binder with the aluminum ash 2 to form granules of the aluminum ash 2 can prevent powdering of the steelmaking secondary material 1 during use.

[0098] However, in the method of granulating aluminum ash 2 by kneading a binder containing organic resin with aluminum ash 2, the granulated secondary material contains organic resin, which can burn during the steelmaking process, generating smoke and worsening the working environment.

[0099] Furthermore, in a method of granulating aluminum ash 2 by kneading a binder containing a mixture of inorganic compounds and water with aluminum ash 2, aluminum nitride contained in the aluminum ash 2 reacts with water during the secondary material manufacturing process to generate ammonia, which has a strong, foul odor, and can worsen the working environment. Furthermore, if the inorganic compound contains steel impurities such as sulfur, not only can it worsen the working environment, but it can also risk degrading the quality of steel products.

[0100] Furthermore, in the method of kneading the binder with the aluminum ash 2 and then granulating the aluminum ash 2, there is a risk that the binder and / or the aluminum ash 2 may scatter during the granulation process, resulting in environmental pollution. Furthermore, in the method of adding the binder to the aluminum ash 2 and then granulating the aluminum ash 2, various costs associated with the production of the secondary material may be high due to the cost of procuring the binder and / or the processing cost for granulation.

[0101] Furthermore, in the method of granulating the aluminum ash 2 by kneading the binder with the aluminum ash 2, there is a concern that the aluminum ash 2 contained in the secondary material may return to powder due to collisions or the like during the production, transportation, and / or use of the secondary material, resulting in a decrease in product yield and the need to clean and remove the powdered aluminum ash 2.

[0102] In the steelmaking auxiliary material 1 manufactured by the manufacturing process according to the embodiment, aluminum ash 2 is contained in a metal container and sealed to manufacture the steelmaking auxiliary material 1, so scattering and powdering of the aluminum ash 2 can be prevented without adding a binder to the aluminum ash 2.

[0103] In the steelmaking auxiliary material 1 manufactured by the manufacturing process according to the embodiment, no binder is added to the aluminum ash 2 contained in the metal container, and therefore it is possible to prevent deterioration of the working environment and / or deterioration of the quality of the steel product due to components other than the aluminum ash 2 contained in the steelmaking auxiliary material 1.

[0104] In the steelmaking auxiliary material 1 manufactured by the manufacturing process according to the embodiment, a metal container is used to contain the aluminum ash 2, which prevents smoke from being generated from the container and prevents deterioration of the working environment and / or deterioration of the quality of steel products due to components contained in the steelmaking auxiliary material 1 other than the aluminum ash 2.

[0105] Therefore, the steelmaking auxiliary material 1 manufactured by the manufacturing process according to the embodiment can solve the following problems: (1) deterioration of the working environment in the auxiliary material manufacturing process using aluminum ash as a raw material and in the steelmaking process when the auxiliary material is used; (2) reduction in usage yield due to scattering, etc. in the steelmaking process when the auxiliary material is used; and (3) reduction in product yield due to powdering, etc. in the auxiliary material manufacturing process, transportation process, and use process.

[0106] The present invention will be specifically explained below with reference to examples, but the present invention is not limited to these examples.

[0107] <Sample Preparation> [Example 1] Steelmaking secondary material 1 using a metal cylindrical container 3 made of aluminum A 0.2 mm thick aluminum plate was bent and processed into a cylindrical shape with a diameter of 66 mm and a height of 70 mm, and one bottom surface of the cylinder was sealed with the same aluminum plate processed into a disk shape, thereby obtaining the container body 31 of the metal cylindrical container 3 according to the embodiment.

[0108] Furthermore, by processing the same aluminum plate material into a disk-shaped lid, a container lid 32 capable of sealing the opening, which is the unblocked bottom surface of the container body 31, was obtained. This resulted in the metal tubular container 3 according to the embodiment. This metal tubular container 3 was approximately cylindrical, with a diameter of 70 mm, a height of 60 mm, a weight of 20 g, a plate thickness of 2 mm, and a specific gravity of 1.4.

[0109] 300 g of powdered aluminum ash 2 containing aluminum oxide, metallic aluminum, and aluminum nitride was placed in the obtained metallic cylindrical container 3, which was then sealed with the container lid 32 and press-molded at a pressure of 25 MPa to obtain a cylindrical steelmaking secondary material 1 (Example 1). The weight of Example 1 was 320 g.

[0110] Comparative Example 1 Powdered Aluminum Ash 2 As a secondary material for steelmaking, 280 g of powdered aluminum ash 2 (Comparative Example 1) containing aluminum oxide, metallic aluminum, and aluminum nitride was prepared.

[0111] [Comparative Example 2] Pressed aluminum ash 2 280 g of powdered aluminum ash 2 containing aluminum oxide, metallic aluminum, and aluminum nitride was press-molded in the same manner as in Example 1 to obtain a cylindrical steelmaking secondary material (Comparative Example 2). The weight of Comparative Example 2 was 300 g.

[0112] In this embodiment, the pressure applied to the aluminum ash 2 or the like during pressure molding is a value measured using a pressure gauge manufactured by Riken Kiki Co., Ltd. The weight is measured using an electronic balance manufactured by A&D Co., Ltd.

[0113] <Evaluation> [Specific Gravity Measurement] The specific gravity of each of the Examples and Comparative Examples was measured using an electronic balance and a tape measure. The specific gravity of Example 1 was 1.4. The specific gravity of Comparative Example 1 was 1.0. The specific gravity of Comparative Example 2 was 1.4.

[0114] [Evaluation of scattering during manufacturing] For each of the examples and comparative examples, an evaluation of scattering during manufacturing was carried out to determine whether aluminum ash 2 would scatter during manufacturing.

[0115] In the example, no aluminum ash 2 was scattered during production. In comparative example 1, there was no process equivalent to production, so scattering evaluation during production was not performed. In comparative example 2, some aluminum ash 2 was scattered during production.

[0116] [Transportation Evaluation] For each of the examples and comparative examples, a transportation evaluation was carried out to determine whether the aluminum ash 2 would be pulverized and scattered due to collision during transportation.

[0117] In the example, the aluminum ash 2 was not powdered by the collision during transportation. In the comparative example 1, the aluminum ash 2 scattered during transportation. In the comparative example 2, a corner was chipped by the collision during transportation, and part of the aluminum ash 2 was powdered and scattered.

[0118] [Storage Evaluation] Each of the examples and comparative examples was stored by piling up the piles in a storage location and removing them, and a storage evaluation was carried out to see whether the aluminum ash 2 would be pulverized and scattered due to collisions during storage.

[0119] In the example, the aluminum ash 2 was not pulverized by collision during storage. In the comparative example 1, the aluminum ash 2 scattered when stacked and taken out. In the comparative example 2, the corners were chipped by collision during stacking and taking out, and part of the aluminum ash 2 was pulverized and scattered.

[0120] [Usage Evaluation] Each of the Examples and Comparative Examples was added as a secondary steelmaking material to a blast furnace for producing steel, and a usage evaluation was carried out to evaluate the contact effect with molten iron, the presence or absence of scattering of aluminum ash 2, and the presence or absence of smoke.

[0121] In the example, the metal container made sufficient contact with the molten iron, and the aluminum ash 2 did not scatter. Also, the example did not emit smoke. In the comparative example 1, the aluminum ash 2 accumulated on the surface of the molten iron, resulting in poor contact efficiency, and some of the aluminum ash 2 scattered.

[0122] [Discussion] The Examples were manufactured by storing aluminum ash 2 in a metal container and then sealing the metal container containing the aluminum ash 2. Therefore, unlike the Comparative Examples, it is believed that scattering and powdering of aluminum ash 2 were prevented during manufacturing, transportation, storage, and use. As a result, it is believed that the Examples prevented the deterioration of the work environment due to scattering and powdering of aluminum ash 2 compared to the Comparative Examples. Furthermore, it is believed that the Examples reduced the loss of aluminum ash 2 due to scattering and powdering of aluminum ash 2, and improved the product yield as a secondary material compared to the Comparative Examples.

[0123] It is believed that because the specific gravity of the Example was greater than that of Comparative Example 1, the metal container did not accumulate on the surface of the molten iron, and sufficient contact with the molten iron occurred, preventing the scattering of aluminum ash 2. As a result, it is believed that the proportion of aluminum ash 2 used as a secondary material in the Example was higher, and the yield of use as a secondary material was improved compared to the Comparative Example.

[0124] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. Furthermore, the effects described in the above-described embodiments are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the above-described embodiments. Furthermore, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those having all of the configurations described.

[0125] REFERENCE SIGNS LIST 1 Steelmaking secondary material 2 Aluminum ash 3 Metallic cylindrical container 31 Container body 32 Container lid 4 Metallic bag-shaped container 41 Container sealing portion

Claims

1. A method for producing steelmaking secondary materials, comprising the steps of housing metal ash and / or metal granules in a metal container without adding a binder, and sealing the metal container.

2. A steelmaking auxiliary material, in which metal ash and / or metal particulate matter is contained in a metal container, said metal container does not contain a binder, and said metal container is sealed.

3. The steelmaking auxiliary material according to claim 2, wherein the metal container contains only the metal ash and / or the metal granules.

4. The steelmaking auxiliary material according to claim 2 or 3, wherein the surface of the metal container is neither labeled nor painted.

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