Identification method of low-carbon-emission aluminum product

Abstract

Provided is a method for easily determining whether or not an aluminum product is a low-carbon-emission aluminum product. A method for identifying a low-carbon-emission aluminum product is provided with: a first step for preparing a low-carbon-emission aluminum ingot; a second step for preparing a low-carbon-emission aluminum product manufactured using the billet; a third step for preparing analysis data by chemically analyzing the elemental composition contained in the product prepared in the second step; a fourth step for preparing standard analysis data for chemical analysis of the elemental composition contained in the standard aluminum product, and comparing the standard analysis data with the analysis data obtained in the third step to obtain comparative data of the elemental composition contained in the standard aluminum product and the low-carbon emission aluminum product; and a fifth step in which the difference between the contents of the specific elements in the two products is extracted from the comparison data, and whether or not the difference is equal to or greater than a predetermined amount is identified or determined. It is possible to discriminate by a scientific, highly reliable and simple method such as analysis of the elemental composition.

Description

Technical Field

[0001] The present invention relates to a method for identifying aluminum products (low-carbon emission aluminum products) manufactured using electricity with low carbon dioxide emissions such as renewable energy, a method for determining the authenticity of the aluminum products, and aluminum products identified by the identification method. Background Art

[0002] In order to realize a decarbonized and sustainable society, it is necessary to radically reduce the environmental impact of aluminum production.

[0003] Generally speaking, aluminum ingots manufactured using electricity obtained from fossil fuels emit a large amount of carbon dioxide during the manufacturing process, 13.9 tons of carbon dioxide per ton of aluminum ingot (i.e., 13.9 tons of carbon dioxide are emitted when 1 ton of aluminum ingot is manufactured), and this high emission has become a problem.

[0004] To address this problem, conventionally, the following approach has been adopted: by utilizing the aluminum recycling method described in Patent Document 1, used aluminum products circulating in the market are recycled and regenerated into aluminum ingots, and the recycled aluminum ingots are used to recycle aluminum.

[0005] However, the aluminum itself before recycling was originally produced by dissolving the ore raw material of bauxite in a caustic soda solution to make a sodium aluminate solution, extracting the alumina component from it, and then electrolyzing the alumina in molten cryolite to produce an aluminum ingot (also called a primary ingot). The manufacturing process of the primary ingot consumes a lot of electricity.

[0006] Therefore, as a measure to further reduce the environmental load, aluminum ingots, commonly known as low-carbon emission aluminum, which are produced using electricity obtained from renewable energy sources such as sunlight, water power, wind power, geothermal energy, and other energies commonly found in nature, are being actively supplied.

[0007] It is known that using aluminum ingots whose carbon dioxide emissions are controlled to 4.0 ton-CO2 / ton-AL or less during their production (i.e., the amount of carbon dioxide emitted when producing 1 ton of aluminum ingot is 4.0 tons or less) is an effective measure to reduce the environmental load in the production of aluminum products.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Laid-Open No. 06-116773

[0011] Patent Document 2: Japanese Patent Application Publication No. 2017-15503

[0012] Patent Document 3: Japanese Patent Application Publication No. 2023-33777 Summary of the invention

[0013] However, among synthetic resins, resins produced from plant-derived raw materials (so-called biomass resins) are known not to increase carbon dioxide emissions relative to resins produced from petroleum-derived raw materials.

[0014] Furthermore, even if petroleum-derived resins and biomass resins have the same chemical structure and the same basic physical properties, it is possible to determine whether the resin is a petroleum-derived resin or a biomass resin by measuring the ratio of carbon isotopes (radiocarbon 14) contained in each resin.

[0015] In addition, even in the case of a mixture of petroleum-derived resin and biomass resin, the proportion of biomass resin contained in the mixture can be estimated by measuring the content ratio of carbon isotopes. Such a ratio is also called biomass ratio.

[0016] In contrast, in the case of aluminum, aluminum ingots produced using fossil fuels as energy and aluminum ingots produced using renewable energy as energy do not differ in elemental isotopes like biomass resins. The only difference is the source of electricity used.

[0017] Therefore, there is a problem that it is impossible to determine whether the aluminum ingot itself or the aluminum foil finally obtained after the subsequent processing steps such as the rolling step is a low-carbon emission aluminum product in which the carbon dioxide emission is suppressed during the production.

[0018] Specifically, in the production of aluminum, since only the source of electricity used is different, the method of adding an identification additive to a resin material to check the content of biomass plastics, such as described in Patent Document 2, cannot be applied.

[0019] Similarly, the identification and traceability method based on labeling related to biomass plastics described in Patent Document 3, for example, is difficult to put into practical use in aluminum products such as those used for high-temperature heating applications, and is also costly.

[0020] Thus, it is difficult to apply the identification methods related to biomass plastics to aluminum, and a method is needed to easily identify whether a product is a low-carbon emission aluminum product.

[0021] Therefore, an object of the present invention is to provide a method for easily determining whether a product is a low-carbon emission aluminum product.

[0022] The inventors of the present invention have repeatedly conducted in-depth research and found that when manufacturing low-carbon emission aluminum products, the composition is slightly changed compared to the composition of aluminum (standard aluminum) obtained by using aluminum ingots manufactured using existing fossil fuels as energy. By comparing the composition of the product composed of standard aluminum (standard aluminum product) and the composition of the product composed of low-carbon emission aluminum (low-carbon emission aluminum product) with the composition analysis data obtained using previously known chemical analysis methods related to the composition, it is easy to identify which type of aluminum product it is.

[0023] At the same time, the inventors of the present invention have repeatedly conducted in-depth research and found that by making the composition difference of the low-carbon emission aluminum product obtained in this way within a specified range relative to the standard aluminum product, the physical properties and characteristics of the low-carbon emission aluminum product will not change, or the changes can be controlled to be tiny.

[0024] Specifically, the first invention is a method for identifying low-carbon emission aluminum products, which comprises at least: a first step of preparing a low-carbon emission aluminum ingot manufactured using electricity with low carbon dioxide emissions; a second step of preparing a low-carbon emission aluminum product manufactured using the above-mentioned aluminum ingot; a third step of preparing analysis data (including analysis results) by chemically analyzing the elemental composition contained in the low-carbon emission aluminum product prepared in the second step; a fourth step of preparing standard analysis data (including analysis results) of the chemical analysis of the elemental composition contained in a standard aluminum product serving as a standard, and comparing the standard analysis data with the analysis data obtained in the third step to obtain comparison data of the elemental composition contained in the standard aluminum product and the low-carbon emission aluminum product; and a fifth step of extracting the difference in the content of a specific element between the standard aluminum product and the low-carbon emission aluminum product from the above-mentioned comparison data, and identifying or determining whether the difference is greater than a specified amount.

[0025] By adopting such an identification method, it is possible to identify whether a low-carbon emission aluminum product is a product by using a scientifically reliable and simple method such as analyzing the elemental composition.

[0026] In addition, the second invention is as follows: in the configuration of the first invention, the low-carbon emission aluminum product to be identified is a product consisting of aluminum foil or a product containing aluminum foil.

[0027] By adopting such an identification method, it is possible to identify whether a product made of aluminum foil or containing aluminum foil used for various purposes by a scientifically reliable and simple method such as elemental composition analysis to identify whether it is a low-carbon emission aluminum product.

[0028] In addition, the third invention is as follows: In the configuration of the first invention or the second invention, the specific element is at least one element selected from Si (silicon), Fe (iron), Cu (copper), Mn (manganese), Mg (magnesium), Zn (zinc), Ti (titanium), and Cr (chromium).

[0029] By using at least one element among elements commonly used in aluminum products as a specific element, it is possible to identify whether a low-carbon emission aluminum product is a product without using a special element that is avoided to be contained in a common aluminum alloy as the specific element.

[0030] In addition, a fourth invention is a method for identifying a low-carbon emission aluminum product, wherein in the configuration of the first invention or the second invention, the difference in content of a specific element is 0.01 mass % or more.

[0031] If the difference in the content of the specific element is 0.01 mass % or more, it becomes a difference that can be reliably detected in a general analysis of the contained element composition, so the reliability of identifying whether it is a low-carbon emission aluminum product is improved.

[0032] In addition, the fifth invention is a method for identifying a low-carbon emission aluminum product, wherein in the configuration of the first invention or the second invention, the specific element is Mn, and the content of Mn in the low-carbon emission aluminum product is 0.01 mass % to 0.2 mass %, and the content of Mn is more preferably 0.1 mass % to 0.15 mass %.

[0033] By selecting Mn, which is generally contained in aluminum alloys, as the specific element and setting the content in the low-carbon emission aluminum product to 0.01 mass % to 0.2 mass %, the reliability of identifying whether the product is a low-carbon emission aluminum product is improved.

[0034] In addition, in the case of Mn, even if the content changes slightly, the physical properties of aluminum do not change much, so it is possible to suppress changes in the physical property values ​​of the standard aluminum product serving as a standard and the low-carbon emission aluminum product serving as an identification target.

[0035] In addition, the sixth invention is as follows: In the composition of the first invention or the second invention, the low-carbon emission aluminum product is a low-carbon emission aluminum ingot manufactured using electricity obtained from renewable energy or a low-carbon emission aluminum product manufactured using recycled aluminum ingots, and the standard aluminum product is an aluminum product manufactured using aluminum ingots manufactured using electricity obtained from fossil fuels.

[0036] By setting the standard aluminum product to an aluminum product manufactured using aluminum billets manufactured using electricity obtained from fossil fuels, it is easy to identify whether the aluminum product to be identified is a low-carbon emission aluminum billet manufactured using electricity obtained from renewable energy or a low-carbon emission aluminum product manufactured using recycled aluminum billets.

[0037] In addition, the seventh invention is a method for identifying low-carbon emission aluminum products, in which, in the composition of the first invention or the second invention, the chemical analysis is a chemical analysis based on at least one of the analytical methods selected from the group consisting of spectrophotometry, atomic absorption spectroscopy, ICP emission spectroscopy, or ICP mass spectrometry.

[0038] As a chemical analysis for the element composition, an analysis method generally used for aluminum products can be used, so it is more scientifically reliable and simpler.

[0039] In addition, the eighth invention is a low-carbon emission aluminum product that is identified by the identification method in the constitution of the first invention or the second invention.

[0040] By adopting such a configuration, a low-carbon emission aluminum product that is recognized as being manufactured from a low-carbon emission aluminum ingot manufactured using electricity with a low carbon dioxide emission amount can be provided simply and with high reliability.

[0041] In addition, the ninth invention is as follows: in the configuration of the eighth invention, the low-carbon emission aluminum product is a product composed of aluminum foil or a product containing aluminum foil.

[0042] By adopting such a configuration, a product made of or including aluminum foil can be easily and reliably provided as a low-carbon emission aluminum product that is recognized as being produced from a low-carbon emission aluminum ingot produced using electricity with low carbon dioxide emissions.

[0043] In addition, the tenth invention is as follows: In the configuration of the ninth invention, the product made of aluminum foil is aluminum foil for cooking, an aluminum foil molded product, or an aluminum foil container.

[0044] By adopting such a configuration, it is possible to simply and reliably provide aluminum foil for cooking, aluminum foil molded products, or aluminum foil containers as low-carbon emission aluminum products that are recognized as being manufactured from low-carbon emission aluminum ingots manufactured using electricity with low carbon dioxide emissions.

[0045] In addition, the 11th invention is a method for determining the authenticity of a low-carbon emission aluminum product, which comprises at least: a first step of preparing analysis data (including analysis results) by chemically analyzing the elemental composition contained in the aluminum product to be identified; a second step of preparing standard analysis data (including analysis results) of the chemical analysis of the elemental composition contained in a standard aluminum product serving as a standard; a third step of comparing the analysis data of the first step with the standard analysis data of the second step to obtain comparative data of the elemental composition contained in the aluminum product to be identified and the standard aluminum product; and a fourth step of calculating the difference in content of a specific element between the aluminum product to be identified and the standard aluminum product based on the comparison data of the third step, and identifying or determining whether the difference is greater than a specified amount.

[0046] By adopting such an authenticity determination method, it is possible to determine whether a low-carbon emission aluminum product is authentic by using a simple method that is highly scientifically reliable and analyzes the elemental composition.

[0047] In addition, the 12th invention is a method for determining the authenticity of a low-carbon emission aluminum product, in the configuration of the 11th invention, wherein the first step includes the following input and sending step: the user inputs the above-mentioned analysis data on the information terminal on the user side and sends it to the server device; the second step includes the following storage step: the server device stores the standard analysis data; the third step includes the following comparison step: reading the analysis data provided by the user through the input and sending step of the first step and the standard analysis data stored in the server device through the storage step of the second step, and obtaining comparison data for the analysis data and the standard analysis data through a program on the server device; the fourth step includes the following display step: identifying whether the difference in the content of a specific element calculated by the comparison data obtained in the comparison step of the third step is greater than a specified amount, and displaying the identification result on the information terminal on the user side.

[0048] By adopting such a network-based authenticity determination method, the identification result of whether the product is a low-carbon emission aluminum product from the server device is displayed on the user's information terminal in response to the input based on the user's information terminal, so it is easy to obtain the authenticity determination result.

[0049] By configuring the low-carbon emission aluminum product identification method of the present invention as described above, it is possible to identify whether a product is a low-carbon emission aluminum product by utilizing a scientifically reliable and simple method such as analyzing the elemental composition contained. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a process for identifying low carbon emission aluminum products.

[0051] Figure 2 It is a process for determining the authenticity of low-carbon emission aluminum products. DETAILED DESCRIPTION

[0052] (Method for identifying low-carbon emission aluminum products according to implementation method)

[0053] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0054] Figure 1 The method for identifying a low-carbon emission aluminum product according to the embodiment shown includes the following first to fifth steps, and can easily identify whether a product is a low-carbon emission aluminum product with high scientific reliability.

[0055] (1st step)

[0056] Figure 1The first step shown is a step of preparing a low-carbon emission aluminum ingot, and is a step of preparing an aluminum ingot manufactured using electricity with a low carbon dioxide emission amount.

[0057] Low-carbon emission aluminum refers to aluminum produced using electricity with low carbon dioxide emissions. In particular, since a large amount of electricity is consumed when producing aluminum ingots, using electricity with low carbon dioxide emissions as such a large amount of electricity to produce aluminum ingots makes a great contribution to reducing the environmental load.

[0058] Here, electric power with low carbon dioxide emissions refers to electric power obtained by a power generation method with low carbon dioxide emissions during power generation, and the power generation method is not particularly limited as long as it is a power generation method with low carbon dioxide emissions.

[0059] As a power generation method with low carbon dioxide emissions, for example, a power generation method using renewable energy can be exemplified. As a power generation method using renewable energy, there are power generation methods using (1) sunlight, (2) wind power, (3) hydropower, (4) geothermal energy, (5) solar heat, (6) heat in the atmosphere and other heat existing in nature, (7) biomass (organic matter from animals and plants), etc.

[0060] In addition to power generation methods using renewable energy, power generation methods using nuclear energy are also included in power generation methods with low carbon dioxide emissions.

[0061] Moreover, by using electricity obtained by the above-mentioned power generation method with low carbon dioxide emissions in a series of manufacturing processes for obtaining aluminum ingots from ordinary ore raw materials, such as extracting aluminum oxide (Al2O3) from bauxite, which is a raw material for aluminum, and electrolyzing the obtained alumina to produce aluminum ingots, low-carbon emission aluminum ingots can be obtained.

[0062] When obtaining an aluminum ingot from bauxite, the method for generating electric power with a low carbon dioxide emission as described above is not limited to a single method, and a plurality of methods may be used in combination.

[0063] In addition, ideally, all the electricity used to obtain aluminum ingots is preferably obtained by a power generation method with low carbon dioxide emissions as described above, but it is not ruled out that part of the electricity used is obtained by a power generation method using fossil energy as fuel, such as thermal power generation.

[0064] In order to reduce the environmental load during aluminum billet production, it is also preferred to control the carbon dioxide emissions emitted during power generation for obtaining 1 ton of low-carbon emission aluminum billet to 4.0 ton-CO2 / ton-AL or less.

[0065] The shape of the low-carbon emission aluminum billet is not particularly limited, and may be appropriately formed into an aluminum plate (large rectangular parallelepiped), an aluminum billet (cylindrical, etc.), or an aluminum ingot (block) depending on the application of the aluminum product ultimately manufactured using the billet.

[0066] In addition, aluminum ingots regenerated (recycled) from aluminum products recovered from the market use much less electricity than aluminum ingots manufactured from scratch using electricity obtained from a power generation method using fossil energy as fuel. Recycled aluminum ingots can be obtained with a few percent of electricity, so recycled aluminum ingots are also included in aluminum ingots manufactured using electricity with low carbon dioxide emissions.

[0067] (Second step)

[0068] Figure 1 The second step shown is a step of preparing a low-carbon emission aluminum product to be manufactured using the low-carbon emission aluminum ingot prepared in the first step.

[0069] It should be noted that the second step includes the following "composition adjustment step": the low-carbon emission aluminum ingot prepared in the first step is melted, and various metal elements are added according to the purpose of the final low-carbon emission aluminum product, thereby adjusting the composition so that the final low-carbon emission aluminum product has the desired properties.

[0070] For example, if the low-carbon emission aluminum product is aluminum foil, a specified amount of a specified metal element component is added to the melting step of the low-carbon emission aluminum ingot prepared in the first step to form a molten metal with a desired elemental composition, and the molten metal is cast to obtain an ingot and an aluminum plate. Then, the ingot and the aluminum plate are sequentially subjected to the steps of cold rolling, intermediate annealing, cold rolling, foil rolling, and final annealing, thereby obtaining aluminum foil as a low-carbon emission aluminum product.

[0071] Low-carbon emission aluminum products generally include known products made of aluminum, such as aluminum foil, aluminum plate, aluminum powder, aluminum castings, aluminum die castings, etc. In addition, when the low-carbon emission aluminum product is a product made of aluminum foil, it includes aluminum foil for cooking, aluminum foil molded products, aluminum foil containers, and aluminum foil laminates formed by laminating aluminum foil with other materials.

[0072] (Step 3)

[0073] Figure 1 The third step shown is a step of preparing analysis data or analysis results by chemically analyzing the element composition contained in the low-carbon emission aluminum product prepared in the second step.

[0074] Here, as long as the elemental composition contained in the low-carbon emission aluminum product is known, the method of chemical analysis is not particularly limited, and the composition analysis method generally used for aluminum composition analysis can be used, for example, chemical analysis methods such as absorptiometry, atomic absorption spectroscopy, ICP emission spectroscopy, and ICP mass spectrometry can be cited.

[0075] Among them, ICP emission spectrometry and ICP mass spectrometry are preferred because they can simultaneously quantify a plurality of elements. In particular, ICP mass spectrometry is more preferred because it can perform quantification with higher sensitivity than ICP emission spectrometry.

[0076] (Step 4)

[0077] Figure 1 The fourth step shown is a step of preparing standard analysis data or standard analysis results of a chemical analysis of the elemental composition contained in a standard aluminum product serving as a standard, and then comparing the standard analysis data with the analysis data obtained in the above-mentioned third step to obtain comparative data of the elemental composition contained in the standard aluminum product and the low-carbon emission aluminum product.

[0078] Here, the standard aluminum product in the fourth process refers to an aluminum product manufactured using aluminum ingots manufactured using electricity that is not electricity with low carbon dioxide emissions, that is, electricity with high carbon dioxide emissions that has been used for many years in the past. Specifically, it refers to an aluminum product manufactured using aluminum ingots manufactured using electricity obtained from fossil fuels.

[0079] Such an aluminum product is prepared as a standard aluminum product, and analytical data of the element composition contained in the standard aluminum product is obtained by chemical analysis, thereby preparing standard analytical data (or "standard analytical results"). Then, by comparing the obtained standard analytical data with the analytical data obtained in the above-mentioned third step, comparative data of the element composition contained in the standard aluminum product and the low-carbon emission aluminum product can be obtained. By obtaining this comparative data, the difference in the content of a specific element in the standard aluminum product and the low-carbon emission aluminum product can be extracted in the next step, that is, the fifth step.

[0080] It should be noted that the method for chemically analyzing the elemental composition contained in the standard aluminum product in the 4th step is not particularly limited, and the same method as the chemical analysis method used in the 3rd step may be used. However, in order to accurately extract the difference in the content of a specific element in the 5th step described later, it is preferred to use the same chemical analysis method as the chemical analysis method used in the 3rd step.

[0081] (5th step)

[0082] Figure 1The fifth step shown is a step of extracting the difference in content of a specific element between the standard aluminum product and the low-carbon emission aluminum product from the comparison data obtained in the fourth step and identifying or determining whether the difference is greater than a specified amount.

[0083] By extracting the difference in the content of a specific element and confirming whether the difference is greater than a predetermined amount, it is possible to identify whether the aluminum product is a low-carbon emission aluminum product by a simple method of analyzing the elemental composition.

[0084] For example, when manufacturing low-carbon emission aluminum ingots, the elemental composition contained in the low-carbon emission aluminum ingots is roughly the same as that of the aluminum ingots originally used in the manufacture of standard aluminum products (aluminum ingots manufactured using electricity obtained from fossil fuels), but when the content of one specific element among the elements contained in the low-carbon emission aluminum product is adjusted to be slightly more or less than that of the standard aluminum product at a level of 0.01 mass %, by performing a composition analysis of the elements contained in the standard aluminum products and the low-carbon emission aluminum products manufactured from each ingot, the difference in the content of the specific element can be determined even at a level of 0.01 mass %.

[0085] If this method is used, for example, even if it is the same aluminum product manufactured in the same factory, when one wants to manage whether the aluminum billet that serves as its source is a low-carbon emission aluminum billet or a conventional aluminum billet (aluminum billet manufactured using electricity obtained from fossil fuels), by tracing back to the distribution source of the aluminum billet used as part of batch management and process management of the product or replacing it (not using it), a composition analysis of the elements contained in the aluminum product can be performed, thereby making it possible to easily determine whether the aluminum product to be identified uses a low-carbon emission aluminum billet.

[0086] By adopting the identification method including the above steps, it is possible to identify whether it is a low-carbon emission aluminum product by a simple method of analyzing the element composition contained in the aluminum product.

[0087] An aluminum product identified as a low-carbon emission aluminum product by the identification method of the low-carbon emission aluminum product of the implementation mode is a low-carbon emission aluminum product of the implementation mode.

[0088] In the method for identifying low-carbon emission aluminum products of the implementation mode, the difference in content of a specific element between a standard aluminum product and a low-carbon emission aluminum product is extracted to identify whether the difference is above a specified amount. There is no particular limitation on which element is selected as the specific element, as long as it is at least one of Si (silicon), Fe (iron), Cu (copper), Mn (manganese), Mg (magnesium), Zn (zinc), Ti (titanium), and Cr (chromium).

[0089] Of course, although Al (aluminum) can also be selected as the main component of aluminum products, it can only determine the difference in Al content in aluminum products. In addition, when there is no difference in Al content, when there is a difference in the content of elements other than Al, the physical property values ​​of the standard aluminum product used as the standard and the low-carbon emission aluminum product used as the identification object will vary greatly.

[0090] By controlling the content of the elements other than Al in this way, it is easy to control the change of the physical property values, so it is preferable to select elements other than aluminum.

[0091] The above-mentioned Si (silicon), Fe (iron), Cu (copper), Mn (manganese), Mg (magnesium), Zn (zinc), Ti (titanium), and Cr (chromium) elements are elements frequently used in aluminum products. By using at least one of the elements commonly used in aluminum products as a specific element, it is possible to identify whether it is a low-carbon emission aluminum product without using special elements.

[0092] In order to improve the reliability of identifying whether or not a low-carbon emission aluminum product is present, the difference in the content of the specific element is preferably 0.01 mass % or more, more preferably 0.05 mass % or more, and even more preferably 0.1 mass % or more.

[0093] The upper limit of the difference in the content of the specific element is not limited as long as it is within a range that can control the change in physical property values ​​from the low-carbon emission aluminum product, but is preferably 0.2 mass % or less, and more preferably 0.15 mass % or less.

[0094] In addition, as a specific element, Mn is particularly preferred, and the Mn content in the low-carbon emission aluminum product is preferably 0.01 mass % to 0.2 mass %, more preferably 0.05 mass % or more, and further preferably 0.1 mass % to 0.15 mass %.

[0095] In such a case, the reliability of identifying whether a product is a low-carbon emission aluminum product can be improved, and changes in the physical property values ​​of the standard aluminum product used as a standard and the low-carbon emission aluminum product used as the identification target can be suppressed, so it is more preferable.

[0096] Specifically, when the specific element is set to Mn and the Mn content in the low-carbon emission aluminum product is 0.01 mass% to 0.2 mass%, it can be easily identified in the form of a difference in content using analytical methods such as ICP emission spectroscopy, and the corrosion resistance, mechanical strength and other properties of the low-carbon emission aluminum product have no changes in physical properties and characteristics compared with standard aluminum products, or the changes can be suppressed to a very small level.

[0097] As a specific element, Zn is also preferred, but the corrosion resistance of the low-carbon emission aluminum product may be reduced due to the Zn content in the low-carbon emission aluminum product. Therefore, the Zn content in the low-carbon emission aluminum product only needs to be 0.2 mass% or less, preferably 0.15 mass% or less, and more preferably 0.1 mass% or less. In addition, the lower limit is preferably 0.01 mass% or more, and more preferably 0.05 mass% or more.

[0098] When it is within this range, the reliability of identifying whether it is a low-carbon emission aluminum product can be improved, and the change in corrosion resistance between the standard aluminum product serving as a standard and the low-carbon emission aluminum product serving as the identification target can be suppressed.

[0099] The low carbon emission aluminum ingot is Al-alloyed by adjusting various components.

[0100] The process of Al alloying has been studied intensively, and a method for distinguishing low-carbon emission aluminum alloy foil with a thickness of 20 μm or less is to make it easy to distinguish from ordinary foil by setting the Mn content contained in the aluminum alloy to 0.01 mass % to 0.2 mass %.

[0101] This Mn content can be easily recognized as being poor by ICP emission spectroscopy, and is an element that does not easily affect various properties such as corrosion resistance and mechanical strength.

[0102] It should be noted that Zn can also be cited as an element that can easily identify the difference from ordinary foil using ICP emission spectroscopy, but as mentioned above, Zn is known to reduce corrosion resistance depending on its content, and Mn, which does not affect product characteristics, is more preferably used as a reference element for identification.

[0103] In the method for identifying low-carbon emission aluminum products of an implementation scheme, when the standard aluminum product is aluminum foil, for example, there can be cited an aluminum foil containing 0.50 mass% to 0.9 mass% Si, 0.60 mass% to 1.0 mass% Fe, less than 0.1 mass% Cu, less than 0.10 mass% Mn, less than 0.05 mass% Mg, less than 0.10 mass% Zn, less than 0.08 mass% Ti, and the remainder Al and unavoidable impurities in 100 mass% of the aluminum foil.

[0104] In this case, the composition of the low-carbon emission aluminum product only needs to be such that the difference in the content of a specific element is set to a predetermined amount or more to an analyzable degree, and the difference is preferably 0.01 mass % or more.

[0105] Therefore, when the composition of the standard aluminum product is within the composition range as listed above, the composition of the low-carbon emission aluminum product relative to the composition of the standard aluminum product can be such that the content of specific elements is set to above ±0.01 mass %, preferably below ±0.2 mass %, more preferably to ±0.05 mass % to ±0.15 mass %, and even more preferably to above ±0.1 mass %.

[0106] Therefore, when Si is selected as the specific element, it is sufficient that Si is contained in the low carbon emission aluminum product in the range of 0.30 mass % to 1.1 mass % so that the difference in the content of Si contained in the standard aluminum product is 0.01 mass %.

[0107] Similarly, when Fe is selected, the specific element is contained in the low-carbon emission aluminum product in the range of 0.40 mass% to 1.2 mass%, when Cu is selected, the range is within the range of 0.30 mass% or less, when Mn is selected, the range is within the range of 0.40 mass% or less, when Mg is selected, the range is within the range of 0.30 mass% or less, when Zn is selected, the range is within the range of 0.30 mass% or less, and when Ti is selected, the range is within the range of 0.25 mass% or less, so that the difference in the content of the specific element contained in the standard aluminum product is 0.01 mass% or more.

[0108] As described above, particularly when the specific element is set to Mn and the Mn content in the low-carbon emission aluminum product is 0.01 mass % to 0.2 mass %, it can be easily identified in the form of a difference in content by chemically analyzing the elemental composition using methods such as ICP emission spectroscopy, and the corrosion resistance, mechanical strength and other properties of the low-carbon emission aluminum product have no changes in physical properties or characteristics compared with standard aluminum products, or the changes can be suppressed to a very small level.

[0109] (Method for determining authenticity of low-carbon emission aluminum products according to implementation method)

[0110] Next, the identification method of the low-carbon emission aluminum product of the present invention can also be used as a method for determining the authenticity of the low-carbon emission aluminum product as an application example.

[0111] Specifically, Figure 2 The authenticity determination method of the low-carbon emission aluminum product of the illustrated embodiment can easily and scientifically determine whether the product is a low-carbon emission aluminum product by at least including the following first to fourth steps.

[0112] (Step 1)

[0113] Figure 2 The first step shown is a step of preparing analysis data or analysis results by chemically analyzing the element composition contained in the aluminum product to be identified.

[0114] This corresponds to the third step of the above-mentioned method for identifying low-carbon emission aluminum products.

[0115] In the authenticity determination method of the implementation mode, for example, by purchasing aluminum products circulating on the market with the same product logo as that of the company, and performing chemical analysis on the elemental composition of the aluminum products, it is possible to determine (authenticity determination) whether it is a low-carbon emission aluminum product. The first step is a step of preparing analytical data that serves as the basis for the determination.

[0116] As a method for chemically analyzing the elemental composition contained in the aluminum product to be identified, the same chemical analysis method as the above-mentioned step 3 can be cited. Among them, ICP emission spectrometry and ICP mass spectrometry are preferred because they can quantify multiple elements at the same time. In particular, ICP mass spectrometry can quantify with high sensitivity compared with ICP emission spectrometry, so it is more preferred.

[0117] In addition, as a means of implementing the authenticity determination method of the implementation method through the network, in the first step, the following input and sending step can be further included: the user inputs the analysis data of the element composition contained in the aluminum product of the identification object on the information terminal on the user side and sends it to the server device.

[0118] For example, the following steps can be cited: a user utilizing the authenticity determination method of the present invention uses an information terminal such as a personal computer, smart phone, tablet computer, or dedicated input terminal in the user's hand to input the analysis data, and sends the analysis data in the form of electronic information to a server device over a network such as the Internet or a local area network.

[0119] It should be noted that the functions of the server device may be installed in a single server device or in a plurality of server devices.

[0120] Alternatively, the server device may be realized by computer resources on the so-called cloud.

[0121] By adopting such an input and sending step, the user can store the analysis data in the form of electronic information in the server device. Through the operation of obtaining comparison data in the third step described later and the calculation of the difference in the content of specific elements in the fourth step, etc., it is possible to more easily and quickly obtain the identification result of whether it is a low-carbon emission aluminum product.

[0122] Furthermore, even when the user is in a remote location, the recognition result can be quickly outputted simply by inputting analysis data into the information terminal.

[0123] (Step 2)

[0124] Figure 2The second step shown is a step of preparing standard analysis data or standard analysis results of chemical analysis of the element composition contained in a standard aluminum product serving as a standard.

[0125] This corresponds to the fourth step of the above-mentioned method for identifying low-carbon emission aluminum products.

[0126] Here, the standard aluminum product refers to an aluminum product manufactured using aluminum ingots manufactured using electricity other than electricity with low carbon dioxide emissions, that is, electricity with high carbon dioxide emissions that has been used for many years in the past, in the same way as the above-mentioned fourth process. Specifically, it refers to an aluminum product manufactured using aluminum ingots manufactured using electricity obtained from fossil fuels.

[0127] For example, by preparing the company's aluminum product (known as an aluminum product manufactured by using aluminum billets produced using electricity obtained from fossil fuels) in advance and performing chemical analysis on the element composition contained in the aluminum product as a standard aluminum product, standard analysis data can be obtained.

[0128] Therefore, in this first step, standard analysis data serving as a basis for authenticity determination is prepared.

[0129] It should be noted that the method for chemically analyzing the element composition contained in the standard aluminum product in the second step is not particularly limited, and the same method as the chemical analysis method used in the first step (that is, the same method as the chemical analysis method used in the third step of the low-carbon emission aluminum product identification method) can be used. In order to accurately extract the difference in the content of the specific element in the fourth step described later, it is preferable to use the same chemical analysis method as the chemical analysis method used in the first step.

[0130] In addition, as a means for realizing the authenticity determination method of the embodiment via a network, the second step may include a storing step of storing the standard analysis data in the server device.

[0131] For example, when the first step includes the input transmission step, by storing the standard analysis data in the server device in advance, the standard analysis data can be immediately provided in the comparison step of the third step described later.

[0132] It should be noted that in the storing step, the user who uses the authenticity determination method of the present invention can store the standard analysis data in the server device, and someone other than the user can also store the standard analysis data in the server device.

[0133] When a person different from the user stores the standard analysis data in the server device, the user is referred to as a client, and the person who stores the standard analysis data in the server device is referred to as a subject.

[0134] For example, when the client is a purchaser of aluminum products and the subject is a seller of aluminum products, when the client wants to confirm whether the aluminum products purchased from the subject are low-carbon emission aluminum products, the subject stores standard analysis data in advance on the server device, thereby only outputting the analysis data of the aluminum products purchased by the client as a user on the information terminal as an input sending step in the first step, and then the identification result of whether it is a low-carbon emission aluminum product can be obtained more easily and quickly through the comparison data in the third step described later and the calculation of the difference in the content of specific elements in the fourth step.

[0135] In addition, as another example, when the client is the quality management department or sales department of aluminum products and the main body is the manufacturing department of aluminum products, when the client needs to present a low-carbon emission aluminum product based on the quality inspection of the aluminum products before shipment and the requirements from the purchasers of the aluminum products after shipment, the client can also more easily and quickly obtain the identification result of whether it is a low-carbon emission aluminum product through the comparison data in the third step described later and the calculation of the difference in the content of specific elements in the fourth step.

[0136] (Step 3)

[0137] Figure 2 The third step shown is a step of comparing the analysis data of the first step with the standard analysis data of the second step to obtain comparative data of the elemental composition of the aluminum product to be identified and the standard aluminum product.

[0138] By comparing the standard analysis data obtained in step 2 with the analysis data obtained in step 1, comparative data of the analysis data of the elemental composition contained in the standard aluminum product and the aluminum product analyzed in step 1 can be obtained.

[0139] By obtaining this comparative data, the difference in content of a specific element between the standard aluminum product and the aluminum product to be identified can be extracted in the next step, that is, step 4.

[0140] In addition, as a means of implementing the authenticity determination method of the implementation method through the network, the third step may include the following comparison step: reading the analysis data provided by the user through the input sending step of the first step and the standard analysis data stored in the server device through the storage step of the second step, and obtaining comparison data between the analysis data and the standard analysis data through a program on the server device.

[0141] For example, when the first step includes the input transmission step, by storing the standard analysis data in the server device in advance, the standard analysis data can be read and immediately provided in the comparison step of the third step.

[0142] Furthermore, by presetting a program for comparing the analysis data with the standard analysis data on the server device, the comparison data can be easily obtained.

[0143] It should be noted that, in the comparison step, the user who uses the authenticity determination method of the present invention may set the program in the server device in advance, or a person other than the user may set the program in the server device.

[0144] When a person different from the user sets the program in the server device, the user can be called a client, and the person who sets the program in the server device can be called a subject.

[0145] (Step 4)

[0146] Figure 2 The fourth step shown is a step of calculating the difference in content of a specific element between the aluminum product to be identified and the standard aluminum product based on the comparison data of the third step and identifying (or determining) whether the difference is greater than a specified amount.

[0147] By extracting the difference in the content of a specific element and confirming whether the difference is greater than a specified amount, it is possible to determine the authenticity of a low-carbon emission aluminum product using a scientifically reliable and simple method such as performing elemental composition analysis.

[0148] For example, when manufacturing low-carbon emission aluminum ingots, although the elemental composition contained in the low-carbon emission aluminum ingots is originally roughly the same as that of the aluminum ingots used in the manufacture of standard aluminum products (aluminum ingots manufactured using electricity obtained from fossil fuels), when the content of one specific element among the elements contained in the low-carbon emission aluminum ingots is made slightly more or less than that of the standard aluminum products at the level of 0.01 mass%, by performing a composition analysis of the elements contained in the standard aluminum products and the low-carbon emission aluminum products manufactured from each ingot, the difference in the content of the specific element can be determined even if it is at the level of 0.01 mass%.

[0149] If this method is used, for example, even if it is the same aluminum product manufactured in the same factory, when one wants to manage whether the aluminum ingot that serves as its source is a low-carbon emission aluminum ingot or a conventional aluminum ingot (aluminum ingot manufactured using electricity obtained from fossil fuels), by using it in conjunction with or instead of tracing back to the distribution source of the aluminum ingot used as part of batch management and process management of the product, a composition analysis of the elements contained in the aluminum product can be performed, thereby making it possible to easily determine whether the aluminum product to be identified is an aluminum product obtained using a low-carbon emission aluminum ingot.

[0150] In addition, as described in the description of step 1, it is also effective to purchase aluminum products circulating on the market with the same product logo as our company, even if there is a statement that the aluminum product means "a product obtained using low-carbon emission aluminum ingots", but when there is doubt about the source of the aluminum product (for example, the aluminum product is an imitation of our company's aluminum product and it is suspected that low-carbon emission aluminum ingots are used).

[0151] That is, the difference in the content of a specific element is calculated based on the comparative data of the analytical data of the element composition of the standard aluminum product obtained through the first to third steps and the aluminum product. If the difference is greater than a predetermined amount, it can be determined that the aluminum product obtained using the company's low-carbon emission aluminum ingot is a genuine product. On the other hand, if the difference is less than a predetermined amount, it can be determined that the aluminum product is not obtained using the company's low-carbon emission aluminum ingot, but is a fake.

[0152] In this way, the authenticity of low-carbon emission aluminum products can be determined scientifically, reliably and simply.

[0153] In addition, as a means of implementing the authenticity determination method of the implementation method through the network, step 4 may include the following display step: identifying whether the difference in the content of a specific element calculated from the comparison data obtained in the comparison step of step 3 is greater than a specified amount, and displaying the identification result on the information terminal on the user side.

[0154] Since the recognition result is displayed on a display of the information terminal on the user side, etc., convenience is improved.

[0155] For example, in a case where the first step includes an input sending step, in the display step of the fourth step, the recognition result can be displayed on an information terminal such as a personal computer, a smart phone, a tablet computer, a dedicated input terminal, etc. in the user's hand in the first step, thereby enabling the recognition result to be provided quickly in response to the user's request.

[0156] Example

[0157] Hereinafter, examples of the present invention and comparative examples are given to further clarify the contents of the present invention.

[0158] First, as a low-carbon emission aluminum product, an aluminum foil is taken as an example to illustrate its production method.

[0159] Initially, a low-carbon emission aluminum ingot is prepared, and after the ingot is melted, a molten metal having a desired element composition is added thereto, thereby casting an ingot and an aluminum plate.

[0160] The casting method is not particularly limited, and a method selected from semi-continuous casting, continuous casting, and mold casting can be used.

[0161] The obtained ingot may be subjected to a homogenization heat treatment. The homogenization heat treatment may be performed, for example, under the conditions of a heating temperature of 300° C. to 630° C. and a heating time of 1 hour to 30 hours.

[0162] Next, the steel sheet is sent to a rolling step. As a rolling method, a wide range of known rolling methods such as hot rolling and cold rolling can be adopted without particular limitation.

[0163] The number of hot rolling cycles in the hot rolling process and the number of cold rolling cycles in the cold rolling process may be appropriately set according to the target final thickness.

[0164] When cold rolling is performed multiple times, intermediate annealing is preferably performed. In this case, the cold rolling step preferably sequentially performs one or more cold rolling, intermediate annealing, and one or more cold rolling.

[0165] The intermediate annealing is preferably performed at an annealing temperature of 300° C. to 630° C. and an annealing time of 1 hour to 30 hours. By adopting the above-mentioned steps, the thickness of the aluminum foil can be easily adjusted.

[0166] Next, after the hot rolling process and the cold rolling process, a foil rolling process is further performed. By providing the foil rolling process, it becomes easier to adjust the thickness of the aluminum foil. The foil rolling process can also be performed by stacking.

[0167] After the foil rolling process, a heat treatment process is performed as a final annealing. The heat treatment conditions can be exemplified by maintaining the foil at 250 to 4000°C for 2 to 50 hours in a desired gas atmosphere (air, nitrogen, argon, etc.), followed by natural cooling. By performing the above heat treatment process, the surface of the aluminum foil can be degreased and softened.

[0168] <Example 1 of the method for identifying low-carbon emission aluminum products>

[0169] (Example 1: Low-carbon emission aluminum product A)

[0170] As Example 1, a low-carbon emission aluminum ingot (an aluminum ingot having a carbon dioxide emission of less than about 4 tons per ton of aluminum) manufactured using electricity obtained from renewable energy sources such as hydroelectric power generation is prepared (the first step), the ingot is melted, and a specified metal element component is added to obtain a molten metal having a desired elemental composition, the molten metal is cast to obtain an aluminum plate having a thickness of 7 mm, and then the aluminum plate is subjected to the steps in the order of cold rolling, intermediate annealing, cold rolling, foil rolling, and final annealing, thereby obtaining a low-carbon emission aluminum product A (aluminum foil) having a thickness of 11 μm and the composition shown in Table 1 (the second step).

[0171] In addition, the element composition selects Mn and Zn as specific elements among the elements contained in the standard aluminum product of Comparative Example 1 described later, and sets them so that their contents are 0.01 mass % or more relative to the standard aluminum product of Comparative Example 1.

[0172] The composition of the low-carbon emission aluminum product A was measured by high-frequency inductively coupled plasma emission spectrometry using (ICPE9800) manufactured by Shimadzu Corporation (Step 3: analytical data).

[0173] (Example 2: Low carbon emission aluminum product B)

[0174] As Example 2, a low-carbon emission aluminum ingot (an aluminum ingot having a carbon dioxide emission of less than about 4 tons per ton of aluminum) manufactured using electricity obtained from renewable energy sources such as hydroelectric power generation is prepared (the first process), the ingot is melted, a specified amount of a specified metal element component is added to obtain a molten metal having a desired elemental composition, the molten metal is cast to obtain an aluminum plate having a thickness of 7 mm, and then the aluminum plate is subjected to the processes in the order of cold rolling, intermediate annealing, cold rolling, foil rolling, and final annealing, thereby obtaining a low-carbon emission aluminum product B (aluminum foil) having a thickness of 11 μm and the composition shown in Table 1 (the second process).

[0175] In addition, in this element composition, Mn is selected as a specific element among the elements contained in the standard aluminum product of Comparative Example 1 described later, and its content is set to 0.01 mass % or more relative to the standard aluminum product of Comparative Example 1.

[0176] The composition of the low-carbon emission aluminum product B was measured by high-frequency inductively coupled plasma emission spectrometry using (ICPE9800) manufactured by Shimadzu Corporation (Step 3: analytical data).

[0177] (Comparative Example 1: Standard aluminum product)

[0178] As Comparative Example 1, an aluminum ingot obtained by using electricity obtained from conventional fossil fuel power generation (an aluminum ingot with a carbon dioxide emission of approximately 14 tons per ton of aluminum) was prepared, the ingot was melted, a specified amount of a specified metal element component was added to obtain a molten metal having a desired elemental composition, the molten metal was cast to obtain an aluminum plate having a thickness of 7 mm, and then the aluminum plate was subjected to each process in the order of cold rolling, intermediate annealing, cold rolling, foil rolling, and final annealing, thereby obtaining a standard aluminum product (aluminum foil) having a thickness of 11 μm and the composition shown in Table 1.

[0179] The composition of the standard aluminum product was measured by high-frequency inductively coupled plasma emission spectrometry using ICPE9800 manufactured by Shimadzu Corporation (standard analysis data).

[0180] [Table 1]

[0181]

[0182] (Identification of low carbon emission aluminum products)

[0183] Using the analysis data obtained by chemically analyzing the elemental compositions of the aluminum foils obtained in Example 1, Example 2, and Comparative Example 1, comparative data on the elemental compositions of the standard aluminum product and the low-carbon emission aluminum product are obtained (Step 4).

[0184] The results are shown in Table 2.

[0185] [Table 2]

[0186]

[0187] The difference in the content of Mn and Zn as specific elements in the standard aluminum product (Comparison Example 1) and the low-carbon emission aluminum product A (Example 1) was extracted from the results in Table 2. As a result, the differences were 0.0220 mass% and 0.0150 mass%, respectively. The low-carbon emission aluminum product A of Example 1 contained more than 0.01 mass% of Mn and Zn as specific elements, respectively, relative to the standard aluminum product of Comparison Example 1, and therefore can be identified as a low-carbon emission aluminum product (5th process).

[0188] Similarly, the difference in the content of Mn as a specific element between the standard aluminum product (Comparison Example 1) and the low-carbon emission aluminum product B (Example 2) was extracted. As a result, the difference was 0.1220 mass%. The low-carbon emission aluminum product B of Example 2 contained more than 0.01 mass% of Mn as a specific element relative to the standard aluminum product of Comparison Example 1, and therefore can be identified as a low-carbon emission aluminum product (Process 5).

[0189] <Example 2 of the method for identifying low-carbon emission aluminum products>

[0190] The aluminum foil rolls (wound products) obtained by winding the aluminum foil of Example 2 and Comparative Example 1 on paper tubes with a width of 250 mm and a length of 7 m, respectively, are placed in a paper packaging box of a specified size with a cutting blade and sealed, and 10 low-carbon emission aluminum products B and standard aluminum products (samples 1 to 10) are prepared.

[0191] It should be noted that since the same packaging box is used for any paper packaging box, the aluminum foil stored in the sealed box cannot be identified as the low-carbon emission aluminum product B or the standard aluminum product in appearance.

[0192] Next, these aluminum products were shuffled and 10 were randomly selected, and each paper packaging box was opened. The elemental composition of the aluminum foil contained was measured by high-frequency inductively coupled plasma emission spectrometry using ICPE9800 manufactured by Shimadzu Corporation (Step 1). The results are shown in Table 3.

[0193] [Table 3]

[0194]

[0195] Separately from this, the aluminum foil of Comparative Example 1 was measured by high-frequency inductively coupled plasma emission spectrometry using (ICPE9800) manufactured by Shimadzu Corporation to prepare standard analysis data (second step).

[0196] [Table 4]

[0197]

[0198] The analysis data of the first step and the standard analysis data of the second step were compared to obtain comparative data of the elemental compositions of the aluminum products of Samples 1 to 10 to be identified (the third step).

[0199] Next, the difference in the content of the specific element, Mn, between the aluminum products of samples 1 to 10 to be identified and the standard aluminum product is calculated based on the comparison data obtained in step 3, and it is identified whether the difference is 0.01 mass % or more. If the difference in the content of Mn is 0.01 mass % or more, it is judged as "0" (i.e., low-carbon emission aluminum product B), and if the difference in the content of Mn is less than 0.01 mass %, it is judged as "×" (i.e., non-low-carbon emission aluminum product B). The results are shown in Table 5.

[0200] [Table 5]

[0201]

[0202] By setting the elemental composition in this way, with Mn in the low-carbon emission aluminum product B as a specific element and making it reach 0.01 mass% or more relative to the standard aluminum product, even if the standard aluminum product and the low-carbon emission aluminum product are mixed together and cannot be distinguished in appearance, it is possible to determine whether it is a low-carbon emission aluminum product by a simple method such as analyzing the elemental composition.

[0203] That is, it can be determined that samples 1, 4, 5, 7, 8, and 9 are standard aluminum products, and samples 2, 3, 6, and 10 are low-carbon emission aluminum products.

[0204] The embodiments and examples disclosed this time are to be considered in all respects as illustrative and non-restrictive.

[0205] The scope of the present invention is clearly indicated by the scope of claims, and all modifications and changes within the scope and equivalent meanings thereof are included.

[0206] The processes in the method for identifying low-carbon emission aluminum products and the steps in the method for determining authenticity may also be supplemented with processes and steps other than those described in the implementation manner.

[0207] The types of low-carbon emission aluminum products are not limited to those exemplified in the embodiments.

Claims

1. A method for identifying low-carbon emission aluminum products, comprising at least the following steps: In the first step, a low-carbon emission aluminum ingot is prepared using electricity with low carbon dioxide emissions; A second step of preparing a low-carbon emission aluminum product manufactured using the aluminum ingot; In the third step, chemical analysis is performed on the element composition contained in the low-carbon emission aluminum product prepared in the second step to prepare analytical data; In the fourth step, standard analysis data of chemical analysis of the element composition contained in a standard aluminum product as a standard is prepared, and the standard analysis data is compared with the analysis data obtained in the third step to obtain comparative data of the element composition contained in the standard aluminum product and the low-carbon emission aluminum product; and The fifth step is to extract the difference in content of a specific element between the standard aluminum product and the low-carbon emission aluminum product from the comparison data, and to identify or determine whether the difference is greater than a specified amount.

2. The method for identifying low-carbon emission aluminum products according to claim 1, wherein: The low-carbon emission aluminum product is a product consisting of aluminum foil or a product containing aluminum foil.

3. The method for identifying low-carbon emission aluminum products according to claim 1 or 2, wherein: The specific element is at least one element selected from the group consisting of Si (silicon), Fe (iron), Cu (copper), Mn (manganese), Mg (magnesium), Zn (zinc), Ti (titanium), and Cr (chromium).

4. The method for identifying low-carbon emission aluminum products according to any one of claims 1 to 3, wherein: The difference in the content of the specific element is 0.01 mass % or more.

5. The method for identifying low-carbon emission aluminum products according to any one of claims 1 to 4, wherein: The specific element is Mn, and its content in the low-carbon emission aluminum product is 0.01 mass % to 0.2 mass %.

6. The method for identifying low-carbon emission aluminum products according to any one of claims 1 to 5, wherein: The low-carbon emission aluminum product is an aluminum product manufactured using low-carbon emission aluminum billets manufactured using electricity obtained from renewable energy or recycled aluminum billets. The standard aluminum product is an aluminum product manufactured using an aluminum billet manufactured using electricity obtained from fossil fuels.

7. The method for identifying low-carbon emission aluminum products according to any one of claims 1 to 6, wherein: The chemical analysis is a chemical analysis based on at least one analytical method selected from the group consisting of absorptiometry, atomic absorption spectroscopy, ICP emission spectroscopy, and ICP mass spectrometry.

8. A low carbon emission aluminum product identified by the identification method according to any one of claims 1 to 7.

9. The low carbon emission aluminum product according to claim 8, wherein: The low-carbon emission aluminum product is a product consisting of aluminum foil or a product containing aluminum foil.

10. The low carbon emission aluminum product according to claim 9, wherein: The product made of aluminum foil is aluminum foil for cooking, an aluminum foil molded product or an aluminum foil container.

11. A method for determining the authenticity of a low-carbon emission aluminum product, comprising at least the following steps: In the first step, chemical analysis is performed on the element composition contained in the aluminum product to be identified to prepare analysis data; Step 2: preparing standard analysis data of chemical analysis of elemental composition contained in standard aluminum products as a standard; In a third step, the analysis data of the first step is compared with the standard analysis data of the second step to obtain comparative data of the element composition of the aluminum product to be identified and the standard aluminum product; and In the fourth step, the difference in content of a specific element between the aluminum product to be identified and the standard aluminum product is calculated based on the comparison data in the third step, and it is identified or determined whether the difference is greater than a specified amount.

12. The method for determining the authenticity of low-carbon emission aluminum products according to claim 11, wherein: The first step includes the following input and transmission step: the user inputs the analysis data on the information terminal on the user side and transmits it to the server device, The second step includes the following steps: storing the standard analysis data by the server device, The third step includes the following comparison step: reading the analysis data provided by the user in the input transmission step of the first step and the standard analysis data stored in the server device in the storage step of the second step, and obtaining comparison data for the analysis data and the standard analysis data through a program on the server device, The fourth step includes a display step of identifying whether the difference in the content of the specific element calculated from the comparison data obtained in the comparison step of the third step is greater than or equal to a predetermined amount, and displaying the identification result on an information terminal on the user side.

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