Production method of steelmaking auxiliary material and steelmaking auxiliary material

Abstract

To provide a steelmaking auxiliary material containing metal ash and / or metal granular material capable of simultaneously preventing deterioration of the working environment and deterioration of the quality of steel products due to components other than metal ash included in the steelmaking auxiliary material, preventing scattering of metal ash, etc., and preventing pulverization in production, transportation and use of the steelmaking auxiliary material.SOLUTION: A production method of a steelmaking auxiliary material 1 includes a step of storing metal ash or the like 2 in a metal container such as a metal cylindrical container 3 and a metal bag-like container 4 without adding a binder and sealing the metal container. In the steelmaking auxiliary material 1 produced by the production method of the present invention, it is preferable that the metal ash or the like 2 be accommodated in the metal container, without the binder stored in the metal container, and the metal container be sealed. Preferably, only the metal ash or the like 2 is stored in the metal container, and it is preferable that neither a label nor a coating be applied to the surface of the metal container.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] Aluminum ash is a powdery substance that is generated during processes such as the heating and melting of metallic aluminum. Aluminum ash 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 called 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 necessary, and secondary and tertiary aluminum ash is generated during the 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 serves as a heat source in the steelmaking process, utilizing the exothermic reaction between metallic aluminum and oxygen, and is an effective, inexpensive secondary material for removing oxygen from molten steel (deoxidation). In addition, aluminum oxide (alumina) 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] Methods for utilizing aluminum ash in the steelmaking process include using the aluminum ash as powder, and using a product made by granulating the aluminum ash with an appropriate binder.

[0005] The method of using the aluminum as powder does not require granulation or compression, making the secondary material manufacturing process easier. However, when using the aluminum as powder, the aluminum ash is prone to scattering as dust when used in the steelmaking process. Therefore, the method of using the aluminum as powder has the disadvantage of resulting in a lower usage 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. For the binder, polyvinyl alcohol, carboxymethyl cellulose, starch, pitch, tar, polystyrene, polyethylene, polyurethane, epoxy resin, phenolic resin, slaked lime, quicklime, water, etc. are used singly or in combination, and are generally kneaded and compressed, and heated as necessary (Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4). [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2004-190069 A [Patent Document 2] JP 2002-18412 A [Patent Document 3] JP 2002-194416 A [Patent Document 4] Japanese Patent Application Publication No. 6-299217 Summary of the Invention [Problem to be solved by the invention]

[0008] However, organic compound-based binders burn during the steelmaking process, generating smoke. In the case of binders containing inorganic compounds, the solvent water reacts with the aluminum nitride in the aluminum ash during the auxiliary material manufacturing process, generating ammonia, which has a strong, foul odor. In addition, it is desirable for the binder to be uniformly dispersed between the aluminum ash particles, so it is preferable for it to be a liquid or fine powder. For this reason, methods that use binders require the use of organic solvents and / or fine powders that are easily scattered, for example, to increase the fluidity of the binder. All of these factors worsen the working environment in the steelmaking process and auxiliary material manufacturing process.

[0009] In addition, some binders are expensive in terms of raw material price. Among binders, those that require heating require high frictional heat in the auxiliary material manufacturing process. These binders lead to 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, which will result in a decrease in product yield and an additional process for cleaning and removing the powdered 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 objectives are as follows. (1) Deterioration of the working environment in the manufacturing process of auxiliary materials using aluminum ash as a raw material and in the steelmaking process when auxiliary materials are used (2) Reduction in yield rate due to scattering during the steelmaking process when using auxiliary materials (3) Reduction in product yield due to powdering, etc. during the manufacturing, transportation and use of auxiliary materials [Means for solving the problem]

[0013] As a result of intensive research into solving the above problems, the inventors have found that the above object can be achieved by storing aluminum ash in a metal container without adding a binder and sealing the metal container containing the aluminum ash. The inventors have also found that this can be applied not only to aluminum ash but also to various metal ash and / or metal granular materials such as electric furnace dust (powders containing FeO, ZnO, etc.), metal cuttings (aluminum cuttings, cutting chips of iron, etc.), etc., and have completed the present invention. Specifically, the present invention provides the following.

[0014] The first aspect of the invention provides a method for producing steelmaking auxiliary materials, the method including the steps of housing metal ash and / or metal particles in a metal housing without adding a binder, and sealing the metal housing.

[0015] According to the first aspect of the invention, metal ash and / or metal granules are contained in a metal container, and the metal container containing the metal ash and / or metal granules is sealed. This prevents the metal ash and / or metal granules from scattering, and prevents a decrease in product yield due to powdering 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 granules contained in the metal container, it is possible to prevent a decrease in the yield of steelmaking secondary materials due to scattering, etc., during the steelmaking process when the secondary materials are used, caused by components other than the metal ash and / or metal granules contained in the steelmaking secondary materials.

[0017] For example, scattering of metal ash and / or metal granules can be prevented by storing metal ash and / or metal granules 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 granules in a non-metallic container and sealing the container, the non-metals constituting 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 contain metal ash and / or metal particles, which prevents smoke from being generated from the container and prevents deterioration of the working environment in the auxiliary material manufacturing process using metal ash and / or metal particles as raw materials, and in the steelmaking process when the auxiliary materials are used.

[0019] Therefore, according to the invention relating to the first feature, it is possible to solve the problems of (1) 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) reduction in utilization yield due to scattering, etc. in the steelmaking process when the secondary materials are used, and (3) reduction 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, which provides a steelmaking auxiliary material, in which 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 granules are contained in the metal container, it is possible to further prevent the working environment in the steelmaking process when the auxiliary materials are used from being deteriorated due to components other than metal ash and / or the metal granules contained in the steelmaking auxiliary 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 the utilization yield due to scattering, etc., in the steelmaking process when the secondary materials are used; and (3) a decrease in the 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 auxiliary 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 no labels are attached or painted on the surface of the metal container, it is possible to prevent the paint, labels, and / or adhesives and glues used in label attachment from burning and generating smoke, which would lead to a deterioration of the working environment in the steelmaking process when auxiliary materials are used.

[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 the utilization yield due to scattering, etc., in the steelmaking process when the secondary materials are used; and (3) a decrease in the product yield due to powdering, etc., in the secondary material manufacturing process, transportation process, and usage process. Effect of the Invention

[0027] According to the present invention, the following problems (1) to (3) can be solved. (1) Deterioration of the working environment in the manufacturing process of auxiliary materials using metal ash and / or said metal granules as raw materials, and in the steelmaking process when using the auxiliary materials (2) Reduction in yield rate due to scattering during the steelmaking process when using auxiliary materials (3) Reduction in product yield due to powdering, etc. during the manufacturing, transportation and use of auxiliary materials [Brief description of the drawings]

[0028] [Figure 1] FIG. 1 is a schematic side view showing an example of a steelmaking secondary material 1 according to the present embodiment. [Diagram 2] FIG. 2 is a schematic plan view of the steelmaking secondary material 1. As shown in FIG. [Diagram 3] FIG. 3 is a schematic diagram showing another example of the steelmaking secondary material 1 according to this embodiment. [Figure 4] FIG. 4 is a cross-sectional view taken along line AA in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, an example of a preferred embodiment of the present invention will be described 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 of manufacturing steelmaking auxiliary material 1> The manufacturing method of steelmaking auxiliary 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 containing the metal ash and / or metal particles 2.

[0031] Moreover, the manufacturing method of the steelmaking auxiliary material 1 in this embodiment preferably further includes a pressure molding step of pressure molding the metal ash and / or metal granular material 2 contained in the metal container. By including the pressure molding step in the manufacturing method of the steelmaking auxiliary material 1 in this embodiment, the specific gravity of the steelmaking auxiliary material 1 can be increased, and the weight per volume of the metal ash and / or metal granular material 2 contained in the steelmaking auxiliary material 1 can be increased. In addition, the powder constituting the metal ash and / or metal granular material 2 is more closely adhered by the pressure molding, and the effect of preventing the metal ash and / or metal granular material 2 from scattering can be expected.

[0032] In this embodiment, the term "metal ash" refers to a substance remaining after burning metal, and the term "metal granules" 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 matter 2 will be described as being aluminum ash 2 as a representative example, but it is not intended to limit the metal ash and / or metal particulate matter to being aluminum ash. In addition to aluminum ash, the metal ash and / or metal particulate matter includes, for example, the following: Electric furnace dust (powders containing FeO, ZnO, etc.) Metal cutting chips (including not only aluminum cutting chips but also cutting chips of iron, etc.) Calcium oxide (CaO: raw material for steelmaking slag, mainly powder) Other steelmaking auxiliary materials (mainly chips and flakes of ferrosilicon, ferronickel, etc., including carbon powder, granular carbon, etc.) Other slag raw materials (mainly powders of SiO2, Al2O3, etc.) Other fluxes (packing and feeding chloride or fluoride powders into aluminum melting furnaces, not steelmaking electric furnaces)

[0034] [Containing process] The accommodation step is a step of accommodating the aluminum ash 2 in a metal accommodation body. Since the aluminum ash 2 is accommodated in the metal accommodation body in the steelmaking auxiliary material 1, the accommodation 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 auxiliary material is used and / or a decrease in the usage yield due to scattering or the like in the steelmaking process when the auxiliary material is used.

[0035] Since the manufacturing method for the steelmaking auxiliary material 1 in this embodiment includes the containing 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 powdered aluminum ash generated when metallic aluminum and / or its alloy are heated and melted. The aluminum ash 2 is also called aluminum dross, aluminum dross residual ash, aluminum residual ash, etc., and includes aluminum oxide, metallic aluminum, and / or aluminum nitride, etc. Furthermore, the aluminum ash 2 may include oxides, chlorides, and / or fluorides, etc., of various elements that constitute the aluminum alloy.

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

[0038] The cost-effectiveness of steelmaking is improved by storing and using the aluminum ash 2 generated during the heating and melting process of metallic aluminum and / or aluminum alloy in the steelmaking auxiliary material 1. Furthermore, by storing the aluminum ash 2 in the steelmaking auxiliary material 1 and effectively using it as a steelmaking auxiliary material, 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] [Metal container] The metal 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 granules. For example, when the metal ash and / or metal granules are aluminum ash, the material of the metal container preferably contains metallic aluminum and / or an aluminum alloy. Metallic aluminum and / or an aluminum alloy contain aluminum that contributes to the steelmaking process, just like 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 auxiliary 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] It is preferable that the material of the metal container 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 in the material of the metal container, it is possible to reduce the risk that the quality of the steel or the like obtained in the steelmaking process will be reduced due to the material that becomes an impurity.

[0043] It is preferable that the metal container has neither a label nor a paint on its surface. By using a metal container with neither a label nor a paint on its surface, it is possible to prevent paint, labels, and / or adhesives and glues used in labeling from burning and generating smoke, which could worsen the working environment in the steelmaking process when secondary materials are used, and prevent a decrease in the yield rate due to scattering, etc., in the steelmaking process when secondary materials are used.

[0044] The metal container may be made of scrap metal material. By using scrap metal material as the metal container, the scrap metal material to be disposed of and / or recycled can be effectively utilized as the metal container for the steelmaking auxiliary material 1. This reduces the amount of scrap metal material to be disposed of and / or the amount to be 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 using scrap metal material, the scrap metal material is preferably scrap metal material from which labels and / or paint have been removed. By using scrap metal material from which labels and / or paint have been removed, it is possible to effectively utilize the scrap metal material while preventing the paint, labels, and / or adhesives and glues used in attaching the labels from burning and generating smoke, which can worsen the working environment and reduce the yield rate due to scattering in the steelmaking process when using secondary materials.

[0046] Below, we will give examples of a metallic cylindrical container 3 having a cylindrical shape and a metallic bag-like 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 containers of the prior art can take, such as various hollow cylinders exemplified by a hollow rectangular prism, a hollow polyhedron, a hollow sphere, a hollow cone, etc.

[0047] (Metal 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 metal container is preferably a metal 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 metallic container as the metallic tubular container 3, it is possible to prevent the shape of the metallic tubular container 3 from changing during transportation, storage, and use of the metallic container. This can facilitate transportation, storage, and use of the metallic container.

[0049] Since the metal container is a metal cylindrical container 3 comprising a container body 31 having an opening and a container lid 32 capable of sealing the opening, 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 tubular 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 portion 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 portion 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 auxiliary 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.

[0052] The upper limit of the thickness of the side portion 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 portion of the container body 31 as described above, the ratio of aluminum ash 2 in the steelmaking auxiliary material 1 can be kept high. Also, the time until the metallic cylindrical container 3 melts in the steelmaking process using the steelmaking auxiliary material 1 can be shortened, and the time until the contained aluminum ash 2 contributes to the steelmaking process can be shortened.

[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 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 metallic cylindrical container 3 when the metallic 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, scattering of the aluminum ash 2 contained in the container step through the opening can be further reduced.

[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 become even easier to accommodate the aluminum ash 2 in the container body 31 through the opening.

[0057] It is preferable that the metallic cylindrical container 3 has neither labels nor paint on the surfaces of the container body 31 and the container lid 32. By using the metallic cylindrical container 3 having neither labels nor paint on its surface, it is possible to prevent paint, labels, and / or adhesives and glues used in 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, etc., in the steelmaking process when secondary materials are used.

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

[0059] The metallic cylindrical 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 cylindrical container 3, the scrap metal cans that are to be disposed of and / or recycled can be effectively utilized as the metallic cylindrical container 3 of the steelmaking auxiliary material 1. This reduces the amount of scrap metal cans to be disposed of and / or the amount to be 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 metallic plate or the like into a cylindrical shape. This can reduce various costs and / or environmental loads incurred when processing a metallic plate or the like into the metallic cylindrical container 3.

[0061] When the metallic cylindrical container 3 is a metallic cylindrical container 3 using a waste metal can, the waste metal can is preferably a waste metal can from which the label and / or paint has been removed. By using the metallic cylindrical container 3 using a waste metal can from which the label and / or paint has been removed, it is possible to effectively utilize the waste metal can and prevent the paint, label, and / or adhesives and glues used for attaching the labels from burning and generating smoke, which may worsen the working environment in the steelmaking process when using secondary materials, and may also reduce the yield rate due to scattering in the steelmaking process when using secondary materials.

[0062] 1, the surface of the container body 31 of the metallic cylindrical container 3 is neither labeled nor painted. This prevents paint, labels, and / or adhesives and glues used for labeling from burning and generating smoke, which can lead to a decrease in yield due to scattering during the steelmaking process when using secondary materials.

[0063] 2, the upper part of the container body 31 and the container lid 32 of the metallic cylindrical container 3 have no labels or paint on the surface. This 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 a decrease in the yield rate due to scattering in the steelmaking process when secondary materials are used.

[0064] (Metal bag-shaped container 4) 3 is a schematic diagram showing another example of the steelmaking secondary material 1 according to this embodiment. The metal container is preferably a metal 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. This can facilitate transportation, storage, and use of the metal container.

[0066] There is no particular limitation on the method for manufacturing the metallic bag-shaped container 4, and it may be manufactured using, for example, a foil (film) of aluminum or the like.

[0067] The metallic bag-shaped container 4 may include a container sealing part 41 capable of sealing the metallic bag-shaped container 4. This allows the metallic bag-shaped container 4 to be sealed using the container sealing part 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 that of the metallic container described above.

[0069] The lower limit of the thickness of the metallic bag-like 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-like container 4 as described above, the risk of the metallic bag-like container 4 being damaged 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 metallic 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 metallic bag-shaped container 4 as described above, the proportion of aluminum ash 2 in the steelmaking secondary material 1 can be kept high. Furthermore, the time until the metallic bag-shaped container 4 melts in the steelmaking process using the steelmaking secondary material 1 can be shortened, thereby shortening the time until the contained aluminum ash 2 contributes to the steelmaking process.

[0071] 3, the metal bag-shaped container 4 includes a container sealing part 41 capable of sealing the metal bag-shaped container 4. This allows the metal bag-shaped container 4 to be sealed using the container sealing part 41 in a sealing step described below.

[0072] [Other items] It is preferable that the aluminum ash 2 without the addition of a binder is contained in the metal container, which can further prevent the deterioration of the working environment and / or the deterioration of the quality of the steel product caused by the binder contained in the steelmaking auxiliary material 1.

[0073] It is preferable that the metal container does not contain any materials other than the binder that 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, it is possible to reduce the risk that the quality of the steel or the like obtained in the steelmaking process will be reduced due to the materials that become impurities.

[0074] It is preferable that the metal container contains only the aluminum ash 2. This makes it possible to further 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.

[0075] [Sealing process] The sealing step is not particularly limited as long as it is a step of sealing a metal container that contains 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 with 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 include a step of fixing the container lid 32 to the container body 31. This makes it possible to more reliably seal the metallic cylindrical container 3 and more effectively prevent the aluminum ash 2 from scattering. The means for fixing the container lid 32 to the container body 31 is not particularly limited.

[0078] Fig. 4 is a cross-sectional view taken along line AA in Fig. 2. In Fig. 4, aluminum ash 2 is contained inside a container body 31. Also, in Fig. 4, an opening at the top of the container body 31 is sealed by a container lid 32. This prevents the aluminum ash 2 from scattering. Also, since the aluminum ash 2 is contained inside 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 in the manufacturing process, transportation process, and / or use process of the steelmaking auxiliary 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 process] 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] The pressure molding step may be, for example, a step of applying pressure from the outside of the metallic cylindrical container 3 and / or the metallic bag-shaped container 4 that contains and seals the aluminum ash 2, thereby pressure molding the aluminum ash 2.

[0082] The lower limit of the pressure applied to the aluminum ash 2 etc. 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 of the embodiment can further increase the specific gravity of the steelmaking auxiliary material 1 and further increase the weight per volume of the aluminum ash 2 contained in the collected steelmaking auxiliary material 1.

[0084] Furthermore, by setting the lower limit of the pressure to be applied to the aluminum ash 2 etc. during pressure molding as described above, the powder constituting the aluminum ash 2 can be more firmly adhered to each other, which can further prevent the aluminum ash 2 from scattering.

[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 is easily contacted with molten iron and / or molten slag in the steelmaking process without scattering, and more aluminum ash 2 is 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 having a volume measuring function.

[0088] The lower limit of the weight of the steelmaking secondary material 1 after the pressure molding step 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 molding step as described above, the steelmaking secondary material 1 is easily brought 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 be carried out more efficiently. This also allows aluminum oxide to be supplied to the slag more efficiently.

[0089] [Steelmaking auxiliary materials 1] By the manufacturing process according to the embodiment, a steelmaking secondary material 1 containing aluminum ash 2 and no 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 metallic cylindrical container 3, the aluminum ash 2 is cylindrical and surrounded by a metal plate and lid, while in a steelmaking auxiliary material 1 in which the metal container is a metallic 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 auxiliary 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 auxiliary material 1 as described above, the steelmaking auxiliary 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 an auxiliary 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 auxiliary 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 auxiliary material 1 as described above, the steelmaking auxiliary 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 used as an auxiliary 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.

[0093] By using the aluminum ash 2 generated during the heating and melting process of metallic aluminum and / or aluminum alloys as a secondary material in steelmaking, the cost-effectiveness of steelmaking can be improved. In addition, by effectively utilizing the aluminum ash 2 as a secondary material in 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.

[0094] In addition, aluminum oxide (also called "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 the aluminum ash 2 is used as a secondary material in steelmaking in its powder form, the aluminum ash 2 may scatter as dust. This may reduce the proportion of the aluminum ash 2 that is effectively used as a secondary material. There is also concern that the scattered dust may worsen the working environment and / or increase steelmaking dust.

[0096] In the steelmaking auxiliary 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 that the contained aluminum ash 2 does not spill out of the container and scattering of the aluminum ash 2 is prevented. In addition, 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 in the manufacturing process, transportation process, and / or use process of the steelmaking auxiliary material 1.

[0097] In order to prevent the aluminum ash 2 from scattering as dust, there is a method in which various binders are mixed with the aluminum ash 2, compressed, and heated as necessary to granulate the aluminum ash 2. Examples of binders include polyvinyl alcohol, carboxymethyl cellulose, starch, pitch, tar, polystyrene, polyethylene, polyurethane, epoxy resin, phenolic resin, slaked lime, quicklime, water, and / or a mixture of two or more of these. The method of granulating the aluminum ash 2 by mixing a binder with the aluminum ash 2 can prevent powdering during use of the steelmaking auxiliary material 1.

[0098] However, in the method of granulating the aluminum ash 2 by kneading a binder containing an organic resin with the aluminum ash 2, the granulated auxiliary materials contain organic resin, and the organic resin burns during the steelmaking process, generating smoke, which can worsen the working environment.

[0099] In addition, 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 in the auxiliary material manufacturing process to generate ammonia, which has a strong odor, and may worsen the working environment. Furthermore, if the inorganic compound contains steel impurities such as sulfur, not only will it worsen the working environment, but there is also a risk of reducing the quality of steel products.

[0100] Furthermore, in a method of kneading the binder with the aluminum ash 2 and granulating the aluminum ash 2, there is a risk that the binder and / or the aluminum ash 2 will scatter during the granulation process, resulting in environmental pollution. In addition, in a method of adding the binder to the aluminum ash 2 and granulating the aluminum ash 2, various costs associated with the production of the auxiliary material may become high due to the procurement costs of the binder and / or the processing costs for granulation, etc.

[0101] Furthermore, in the method of granulating the aluminum ash 2 by mixing a 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 a situation where the powdered aluminum ash 2 must be cleaned away.

[0102] In the steelmaking auxiliary material 1 manufactured by the manufacturing process of the embodiment, aluminum ash 2 is contained in a metal container and sealed to produce the steelmaking auxiliary material 1, so that 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, since no binder is added to the aluminum ash 2 contained in the metal container, 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 the steel product due to components other than the aluminum ash 2 contained in the steelmaking auxiliary material 1.

[0105] Therefore, the steelmaking auxiliary material 1 manufactured by the manufacturing process of 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) decrease in usage yield due to scattering, etc. in the steelmaking process when the auxiliary material is used, and (3) decrease in product yield due to powdering, etc. in the auxiliary material manufacturing process, transportation process, and use process. EXAMPLES

[0106] The present invention will be described in detail below with reference to examples, but the present invention is not limited to these. There is none.

[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 the same aluminum plate was processed into a disk shape to cover one bottom surface of the cylinder, thereby obtaining the container body 31 of the metallic cylindrical container 3 according to the embodiment.

[0108] Moreover, 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 metallic cylindrical container 3 according to the embodiment. This metallic cylindrical container 3 was approximately cylindrical in shape 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, sealed with the container lid 32, and then pressure-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 powder-like aluminum ash 2 (Comparative Example 1) containing aluminum oxide, metallic aluminum, and aluminum nitride was prepared.

[0111] [Comparative Example 2] Pressed aluminum ash 2 A cylindrical steelmaking auxiliary material (Comparative Example 2) was obtained by pressure molding 280 g of powder-like aluminum ash 2 containing aluminum oxide, metallic aluminum, and aluminum nitride in the same manner as in Example 1. 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 the comparative examples, an evaluation was carried out as to whether or not aluminum ash 2 would scatter during manufacturing.

[0115] In the working example, the aluminum ash 2 did not scatter during production. In the comparative example 1, there was no process equivalent to the production, so the evaluation of the scattering during production was not performed. In the comparative example 2, a part of the aluminum ash 2 scattered during production.

[0116] [Transportation evaluation] For each of the examples and the comparative examples, a transportation evaluation was carried out to determine whether the aluminum ash 2 would be pulverized and scattered due to a 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] For each of the examples and comparative examples, the aluminum ash 2 was piled up in a storage area and then removed from the storage area, and a storage evaluation was performed to see whether the aluminum ash 2 was pulverized and scattered due to collisions during storage.

[0119] In the working 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 when stacked and taken out, and part of the aluminum ash 2 was pulverized and scattered.

[0120] [Usage evaluation] For each of the examples and comparative examples, the materials were added as auxiliary steelmaking materials 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 working example, the metal container made sufficient contact with the molten iron, and the aluminum ash 2 did not scatter. In addition, the working 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] [Consideration] The Examples are manufactured by storing aluminum ash 2 in a metal container and sealing the metal container that contains the aluminum ash 2, and therefore, unlike the Comparative Examples, it is believed that scattering and powdering of the aluminum ash 2 are prevented during manufacturing, transportation, storage, and use. As a result, it is believed that the Examples prevent the deterioration of the work environment due to scattering and powdering of the aluminum ash 2 compared to the Comparative Examples. Also, it is believed that the Examples reduce the reduction in aluminum ash 2 due to scattering and powdering of the aluminum ash 2, and improve the product yield as an auxiliary material compared to the Comparative Examples.

[0123] It is considered that, since the specific gravity of the Example is larger than that of Comparative Example 1, the metal container does not accumulate on the surface of the molten iron, contact with the molten iron is sufficient, and the aluminum ash 2 does not scatter. As a result, it is considered that the proportion of aluminum ash 2 used as a secondary material is high in the Example, and the usage yield as a secondary material is 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 explain the present invention in an easily understandable manner, and are not necessarily limited to those having all of the configurations described. [Explanation of symbols]

[0125] 1. Steelmaking auxiliary materials 2. Aluminum ash 3 Metallic cylindrical container 31 Container body 32 Container lid 4 Metal 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 particles in a metal housing without adding a binder, and sealing the metal housing.

2. The metal ash and / or metal particles are contained in a metal container, The metallic container does not contain a binder, The metal container is sealed.

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

4. 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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