Metal element resource circulation system

Abstract

To provide a metal element resource circulation system that can lead to reduction in a natural resource utilization and reduction in an amount of CO2 emission.SOLUTION: In a metal element resource circulation system 1 that comprises nodes 10 to 30 each constituting a network 100 and managing data on a production of a metal compound, at least one node 10 is configured to record natural derivation metal element-amount data 12 in a storage unit 11, at least one node 20 is configured to record waste and the like derivation metal element-amount data 22 in a storage unit 21, at least one node 30 is configured to associate metal element data 32 given to a produced metal compound with the natural derivation metal element-amount data 12 and the waste and the like derivation metal element-amount data 22, and record the associated metal compound data 32 in a storage unit 31. Also, a node 40 is configured to, with reference to the metal compound data 32, grasp a movement of the produced metal compound, prepare tracking data, and record the tracking data in a storage unit 41.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a metallic element resource circulation system that manages the circulation of metallic elements. [Background technology]

[0002] Conventional linear economic activities (linear economy), in which consumed resources are discarded without being recycled or reused, have caused many environmental problems, such as resource and energy shortages, global warming, waste disposal, etc. Therefore, circular economic activities that conserve and maintain the value of resources, materials, and products for as long as possible and minimize waste generation have been advocated (see, for example, Non-Patent Document 1).

[0003] The Japanese government has also declared that it will aim to achieve carbon neutrality, that is, reduce greenhouse gas emissions to zero overall by 2050. "Total zero emissions" means that the total amount of greenhouse gas emissions, including carbon dioxide (CO2), will be subtracted from the amount absorbed through afforestation, forest management, etc., to make the total essentially zero. In other words, to achieve carbon neutrality, it is necessary to reduce greenhouse gas emissions and to preserve and strengthen absorption (see, for example, Non-Patent Document 2).

[0004] Carbon neutrality will involve reducing CO2 emissions through electrification and energy conservation, but will also require CCUS (carbon capture, utilisation and storage) technology to deal with unavoidable CO2 emissions. One promising CCUS technology is one that utilizes CO2 captured from exhaust gases from manufacturing industries and other sources, as well as metal elements extracted from waste and by-products. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Towards a Circular Economy - Ministry of the Environment, Internet<URL:https: / / www.env.go.jp / policy / hakusyo / r03 / html / hj21010202.html> [Non-Patent Document 2] What is Carbon Neutral? - Decarbonization Portal - Ministry of the Environment, Internet<URL:https: / / ondankataisaku.env.go.jp / carbon_neutral / about / > Summary of the Invention [Problem to be solved by the invention]

[0006] By using waste-derived metal elements made from waste and by-products as raw materials for metal compounds, it is possible to realize a circular economy. In addition, by using waste-derived metal elements made from waste and by-products as raw materials for metal compounds, it is possible to reduce the amount of CO2 emissions from energy sources emitted until the acquisition of naturally derived metal elements, such as raw material procurement, manufacturing, logistics, and sales. Furthermore, by using decarbonated waste-derived metal elements made from waste and by-products as alternative raw materials for naturally derived metal elements, it is possible to reduce non-energy derived CO2 emissions associated with the reduction in the amount of naturally derived metal elements used. However, since it is difficult to determine whether the metal elements used are manufactured from waste-derived metal elements, it has been difficult to grasp whether the use of naturally derived metal elements using natural resources has been reduced and whether CO2 emissions have been reduced.

[0007] In other words, in order to understand whether naturally occurring metal elements using natural resources are being reduced and whether CO2 emissions are being reduced, it is necessary to clearly distinguish whether the metal elements used in the production of metal compounds are manufactured from metal elements derived from waste, etc. Therefore, the present invention aims to provide a resource circulation system for metal elements that can clarify whether or not the metal elements used have been manufactured from metal elements derived from waste, etc., by managing data on the amount of naturally occurring metal elements and data on the amount of metal elements derived from waste, etc., for the metal elements used to produce metal compounds, and by understanding the amount of naturally occurring metal elements using natural resources and the amount of CO2 emissions in the movement of metal compounds (from production to disposal), leading to a reduction in the use of natural resources and a reduction in CO2 emissions. [Means for solving the problem]

[0008] As a result of intensive research into solving the above problems, it was found that the above problems can be solved by managing, via a network, data on the amount of naturally occurring metal elements in resources used to produce metal compounds and data on the amount of metal elements derived from waste, etc., in order to clearly determine whether or not the metal elements used are produced from metal elements derived from waste, etc. The present invention has been completed based on the above findings. The present invention is as follows.

[0009] [1] A resource circulation system for metal elements comprising nodes each forming a network and managing data related to the production of metal compounds, wherein at least one of the nodes calculates the amount of naturally occurring metal elements derived from naturally occurring metal elements among the metal elements used in the production of the metal compounds, generates naturally occurring metal element amount data based on the calculated amount of the naturally occurring metal elements, and records the naturally occurring metal element amount data in the network; at least one of the nodes calculates the amount of waste-derived metal elements derived from waste or by-products among the metal elements used in the production of the metal compounds, generates waste-derived metal element amount data based on the calculated amount of the waste-derived metal elements, and records the waste-derived metal element amount data in the network; and at least one of the nodes links the naturally occurring carbon metal element amount data and the waste-derived metal element amount data to the metal element data assigned to the produced metal compounds, and records the linked metal element data in the network. [2] The resource circulation system for metal elements described in [1], wherein at least one of the nodes keeps track of the movement of the produced metal compounds and records tracking data in the network. [3] A resource circulation system for metal elements described in [1] or [2], wherein at least one of the nodes identifies metal compounds in which the ratio of naturally occurring metal elements among the metal elements used in production is 98% or less. [4] The resource circulation system for metal elements according to any one of [1] to [3], wherein the metal compound contains at least one of an alkali metal and an alkaline earth metal. [5] A resource circulation system for metal elements described in any of [1] to [4], in which the method for distinguishing between naturally occurring metal elements and metal elements derived from waste, etc., is a comprehensive judgment based on the analytical results of observing particle shape using SEM, quantifying trace elements using XRF, and quantifying trace elements using ICP-OES. [6] The resource circulation system for metal elements described in any one of [1] to [5], wherein the network is a blockchain network. [7] A resource circulation system for metal elements described in any of [1] to [6], wherein at least one of the nodes adds data regarding energy-origin CO2 emissions when using the naturally occurring metal element to the naturally occurring metal element amount data, and at least one of the nodes adds data regarding energy-origin CO2 emissions when using the waste-derived metal element to the waste-derived metal element amount data. Effect of the Invention

[0010] According to the present invention, by managing data on the amount of naturally occurring metal elements and data on the amount of metal elements derived from waste, etc., for metal elements used to produce metal compounds, it is possible to clarify whether the metal elements used have been manufactured based on metal elements derived from waste, etc., and by understanding the amount of naturally occurring metal elements using natural resources and the amount of CO2 emissions in the movement of metal compounds (from production to disposal), it is possible to provide a resource circulation system for metal elements that can lead to a reduction in the use of natural resources and a reduction in CO2 emissions. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a conceptual diagram showing an example of a resource circulation system for metal elements according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A metal element resource circulation system 1 according to an embodiment of the present invention (hereinafter may be simply referred to as "this embodiment") includes nodes 10, 20, 30, 40, 50, and 60, each of which constitutes a network 100 and manages data related to the production of metal compounds, as shown in FIG. The metal compound in this specification is a metal compound containing at least one of metal elements such as alkali metals, alkaline earth metals, amphoteric metals, and transition metals, and in particular, a metal compound containing at least one of alkali metals and alkaline earth metals. There are no particular limitations on the metal compound as long as it is a compound containing a metal element, and examples of the metal compound include compounds containing a metal element such as hydrogen compounds, oxides, small oxo acids, hydroxides, halides, sulfates, nitrates, carbonates, acetates, and metal complexes (coordination compounds). When the metal compound contains an alkali metal, examples of the alkali metal include hydrogen compounds, oxides, small oxo acids, hydroxides, halides, sulfates, nitrates, carbonates, acetates, and metal complexes (coordination compounds). Among these, alkali metal oxides and their composite oxides, hydroxides, halides, sulfates, sulfites, nitrates, and nitrites are preferred, and alkali metal oxides, hydroxides, and sulfates are more preferred. Specific examples of alkali metals include lithium oxide, lithium hydroxide and monohydrate, lithium chloride, lithium sulfate, lithium nitrite, lithium nitrate, sodium oxide, sodium hydroxide, sodium chloride, sodium sulfate and its decahydrate, sodium silicate, soda ash, soda lime, potassium hydroxide, potassium chloride, potassium sulfate, potassium nitrate, potassium silicate, potassium alum, and the like. When the metal compound contains an alkaline earth metal, examples of the alkaline earth metal include hydrogen compounds, oxides, small oxo acids, hydroxides, halides, sulfates, sulfites, nitrates, nitrites, carbonates, acetates, and metal complexes (coordination compounds). Among these, alkaline earth metal hydrogen compounds, oxides, small oxo acids, hydroxides, halides, sulfates, nitrates, nitrites, acetates, and metal complexes (coordination compounds) are preferred, and alkaline earth metal oxides and their composite oxides, hydroxides, halides, sulfates, and nitrates are more preferred. Specific examples of alkaline earth metals include calcium oxide, calcium hydroxide, calcium chloride and its hydrates (dihydrate, tetrahydrate, hexahydrate), calcium sulfate and its hydrates (hemihydrate, dihydrate), calcium nitrate and its tetrahydrate, magnesium oxide, magnesium hydroxide, magnesium chloride and its hexahydrate, magnesium nitrate and its hexahydrate, and the like.

[0013] The network 100 of the present invention connects nodes on an information and communication network, and processes and records data on the amount of naturally occurring metal elements, data on the amount of metal elements derived from waste materials, and data on metal elements in a distributed manner using encryption technology. The network 100 is an information and communication network such as the Internet, an intranet, a cloud network, and a blockchain network, and is preferably a blockchain network among others. By using an electronic signature and a hash pointer, the data having a data structure that makes it easy to detect tampering is held by a large number of distributed nodes, thereby realizing high availability and data integrity. As the blockchain network, it is preferable to adopt a consortium type blockchain, but other formats such as a public type blockchain may also be used.

[0014] The number of nodes in the metallic compound resource circulation system 1 is six in Fig. 1, but is not limited to six, and may be five or less, or seven or more. The nodes in the metallic compound resource circulation system 1 are connected to each other via a network 100 so as to be able to communicate with each other. Each node includes a storage unit capable of storing the above data. As the storage unit, for example, a storage medium such as a ROM, a RAM, or a hard disk can be adopted. Each node includes an input unit that inputs and stores data in the memory unit. The input unit may be a user interface of an information processing device, such as a mouse, a keyboard, a touch panel, or a voice input device.

[0015] At least one node 10 constituting the network 100 calculates the amount of naturally occurring metal elements, among the metal elements used in the production of the metal compound, that are derived from naturally occurring metal elements as raw materials. Methods for calculating the amount of naturally occurring metal elements derived from naturally occurring metal elements as raw materials include a method of calculating from the amount of raw material used to extract the naturally occurring metal elements used in the production of the metal compound, and a method of calculating from the ratio of the naturally occurring metal elements to the metal elements used in the production of the metal compound, which will be described later. Then, the node 10 generates naturally occurring metal element amount data 12 based on the calculated amount of the naturally occurring metal element. The naturally occurring metal element amount data 12 is data on the amount of naturally occurring metal elements that are used in the metal compound and are derived from naturally occurring metal elements as raw materials. Then, the node 10 records the naturally occurring metal element amount data 12 in the memory unit 11 provided in the node 10. Recording the naturally occurring metal element amount data 12 in the memory unit 11 provided in the node 10 constituting the network 100 is synonymous with recording the naturally occurring metal element amount data 12 in the network 100.

[0016] At least one node 20 constituting the network 100 calculates the amount of waste-derived metal elements, which are made from waste or by-products as raw materials, among the metal elements used in the production of metal compounds. Methods for calculating the amount of waste-derived metal elements, which are made from waste-derived metal elements as raw materials, include a method of calculating from the amount of raw material used to extract the waste-derived metal elements used in the production of metal compounds, and a method of calculating from the ratio of waste-derived metal elements to the metal elements used in the production of metal compounds, which will be described later. Then, the node 20 generates waste-derived metal element amount data 22 based on the calculated amount of waste-derived metal elements. The waste-derived metal element amount data 22 is data on the amount of waste-derived metal elements that are made from waste or by-products as raw materials, among the metal elements used in metal compounds. Then, the node 20 records the waste-derived metal element amount data 22 in the memory unit 21 provided in the node 20. Recording the waste-derived metal element amount data 22 in the memory unit 21 provided in the node 20 constituting the network 100 is synonymous with recording the waste-derived metal element amount data 22 in the network 100.

[0017] At least one node 30 constituting the network 100 links the naturally occurring metal element amount data 12 and the waste-derived metal element amount data 22 to the metal compound data 32 assigned to the produced metal compound. Then, the node 30 records the metal compound data 32 linked to the naturally occurring metal element amount data 12 and the waste etc.-derived metal element amount data 22 in the memory unit 31 provided in the node 30. Recording the metal compound data 32 linked to the naturally occurring metal element amount data 12 and the waste etc.-derived metal element amount data 22 in the memory unit 31 provided in the node 30 constituting the network 100 is synonymous with recording the metal compound data 32 linked to the naturally occurring metal element amount data 12 and the waste etc.-derived metal element amount data 22 in the network 100.

[0018] At least one of the nodes 40 constituting the network 100 refers to the metal compound data 32 , grasps the movement of the produced metal compounds, and creates tracking data (not shown) in the network 100 . Then, the node 40 records the tracing data in the storage unit 41 included in the node 40. Recording the tracing data in the storage unit 41 included in the node 40 constituting the network 100 is synonymous with recording the tracing data in the network 100. By recording the tracking data on network 100, it is possible to grasp the movement of metal compounds (from production to disposal) by accessing network 100 and referring to the tracking data, and it is possible to grasp the movement of the amount of naturally occurring metal elements used in the metal compounds and the amount of metal elements derived from waste, etc. by using the naturally occurring metal element amount data 12 and the waste, etc. derived metal element amount data 22 linked to the metal compound data 32 of the metal compound.

[0019] At least one node 50 constituting the network 100 calculates the ratio of naturally occurring metal elements in the metal elements used in the production of metal compounds by referring to the metal compound data 32 linked to the naturally occurring metal element amount data 12 and the waste-derived metal element amount data 22, and creates ratio calculation data (not shown). Then, the node 50 refers to the ratio calculation data, identifies metal compounds in which the ratio of naturally occurring metal elements is 98% or less, and records in the metal compound data 32 of the metal compounds in which the ratio of naturally occurring metal elements is 98% or less that the ratio is excellent. Note that the ratio of naturally occurring metal elements in this specification refers to the ratio based on mass. Then, the node 50 records the ratio calculation data in the storage unit 51 provided in the node 50. Recording the ratio calculation data in the storage unit 51 provided in the node 50 constituting the network 100 is synonymous with recording the ratio calculation data in the network 100. By using metal compounds in which the ratio of naturally occurring metal elements identified by node 50 is 98% or less, it is possible to realize circular economic activities (circular economy). In addition, when using metal elements derived from already decarbonated waste, etc., made from waste and by-products, as alternative raw materials for naturally occurring metal elements, by using metal compounds in which the ratio of naturally occurring metal elements identified by node 50 is 98% or less, it is possible to reduce non-energy-related CO2 emissions by reducing the amount of natural metal elements used, which can lead to a reduction in CO2 emissions. The ratio of naturally occurring metal elements identified by node 50 is a threshold for realizing a circular economic activity (circular economy) and enabling a reduction in non-energy-related CO2 emissions by reducing the use of natural metal elements, and is not limited to 98% and may be, for example, 80% or 50%.

[0020] At least one node 60 constituting the network 100 creates raw material identification data (not shown) that identifies whether the metal element used in the production of the metal compound is a naturally occurring metal element or a waste-derived metal element. For example, the node 60 can create the raw material identification data by referring to the metal compound data 32 linked to the naturally occurring metal element amount data 12 and the waste-derived metal element amount data 22. Furthermore, the node 60 can also include in the raw material identification data the ratio of naturally occurring metal elements and metal elements derived from waste or the like among the metal elements used in the production of the metal compound. Then, the node 60 records the ingredient identification data in the storage unit 61 provided in the node 60. Recording the ingredient identification data in the storage unit 61 provided in the node 60 constituting the network 100 is synonymous with recording the ingredient identification data in the network 100. Methods for identifying whether a metal element used in the production of a metal compound is a naturally occurring metal element or a waste-derived metal element include, in addition to referring to the metal compound data 32, observation of particle shape by SEM, quantitative analysis of trace elements by XRF, and quantitative analysis of trace elements by ICP-OES. It is preferable to comprehensively determine the identification of a metal element used in the production of a metal compound from the analytical results of observation of particle shape by SEM, quantitative analysis of trace elements by XRF, and quantitative analysis of trace elements by ICP-OES.

[0021] According to the metal compound resource circulation system 1 of this embodiment, the metal compound data 32 assigned to the produced metal compound is linked to the naturally occurring metal element amount data 12 and the waste, etc.-derived metal element amount data 22. Therefore, by referring to the metal compound data 32, it is possible to clarify whether the metal element used as a raw material was produced based on a metal element derived from waste, etc., and the amount of the waste, etc.-derived metal element used as a raw material. According to the resource circulation system 1 for metal compounds of this embodiment, data on the amount of naturally occurring metal elements and data on the amount of metal elements derived from waste, etc., in the resources used to produce the metal compounds are managed, and the metal elements produced from metal elements derived from waste, etc., account for the majority of the metal elements used as raw materials, thereby making it possible to realize a circular economic activity (circular economy). In addition, by making the metal elements produced from metal elements derived from waste, etc. account for the majority of the metal elements used as raw materials, it is possible to reduce the amount of energy-origin CO2 emissions emitted until the naturally occurring metal elements are obtained, such as in raw material procurement, production, logistics, and sales. Furthermore, by using metal elements derived from waste, etc. that have already been decarbonated and made from waste and by-products as raw materials as an alternative raw material for naturally occurring metal elements, it is possible to reduce non-energy-origin CO2 emissions associated with the reduction in the amount of naturally occurring metal elements used. In other words, by realizing a reduction in the amount of natural metal elements used, it is possible to reduce energy-origin CO2 emissions and non-energy-origin CO2 emissions, which can lead to a reduction in the total CO2 emissions obtained by combining energy-origin CO2 emissions and non-energy-origin CO2 emissions.

[0022] [Modification of the embodiment] The resource circulation system 1 according to the present embodiment may further include a node and a storage unit (not shown) for handling ownership data related to the ownership of the metal compound and the metal element used to produce the metal compound. The ownership data is data indicating the source and location of the metal compound and the metal element used to produce the metal compound, and is data for managing the source and location of the metal compound and the metal element used to produce the metal compound. The ownership data is recorded in the network 100 so as to move with the movement of the metal compound and the metal element used to produce the metal compound, thereby making it possible to manage the current location, as well as the source and past locations of the metal compound and the metal element used to produce the metal compound. By managing the ownership data, it becomes possible to grasp the amount of naturally occurring metal elements used in the metal compound and the movement of the amount of waste-derived metal elements. Owners recorded as ownership data include, but are not limited to, agricultural, forestry and fishery businesses, foresters, fishermen, miners, manufacturers and importers / exporters, dismantling companies, recyclers, consulting companies, design companies, construction companies, research institutes, owners of metal compounds, electricity and gas companies, transport companies, trading companies, agents, wholesalers / cooperatives, finance and insurance companies, real estate companies, service companies, etc. Owners recorded as ownership data can be recorded as co-owners if there are two or more owners.

[0023] [Other embodiments] In the above explanation, the focus has been on realizing a circular economic activity (circular economy) and no particular mention has been made of energy-origin CO2 emissions, but the metallic element resource circulation system 1 can be a system that includes data on energy-origin CO2 emissions. By having the metallic element resource circulation system 1 be a system that includes data on energy-origin CO2 emissions, it can be possible to grasp the energy-origin CO2 emissions associated with the production of metal compounds and contribute to reducing energy-origin CO2 emissions.

[0024] Specifically, at least one node 10 constituting the network 100 adds data on the amount of energy-origin CO2 emissions when using a naturally-occurring metal element made from a naturally-occurring metal element as a raw material to the naturally-occurring metal element amount data 12. The data on the amount of energy-origin CO2 emissions when using a naturally-occurring metal element made from a naturally-occurring metal element as a raw material includes data on the amount of CO2 emissions emitted up to the production of the naturally-occurring metal element (first energy-origin CO2 emissions) and data on the amount of CO2 emissions emitted up to the production of a metal compound using the naturally-occurring metal element (second energy-origin CO2 emissions). The first energy-derived CO2 emissions are, for example, the total amount of CO2 emissions emitted until naturally occurring metal elements are obtained through raw material procurement, manufacturing, logistics, sales, etc. The second energy-derived CO2 emissions are, for example, the total amount of CO2 emissions emitted until naturally occurring metal elements become metal compounds through fuel combustion, electricity use, etc.

[0025] Furthermore, at least one node 20 constituting the network 100 adds data on the amount of CO2 emissions from energy origin when using metal elements derived from waste, etc., using waste / by-products as raw materials, to the waste-derived metal element quantity data 22. The data on the amount of CO2 emissions from energy origin when using metal elements derived from waste, etc., using waste / by-products as raw materials includes data on the amount of CO2 emissions emitted up to the production of metal elements derived from waste, etc. (third energy-origin CO2 emissions) and data on the amount of CO2 emissions emitted up to the production of metal compounds using metal elements derived from waste, etc. (fourth energy-origin CO2 emissions). The third type of CO2 emissions from energy sources is, for example, the total amount of CO2 emissions emitted until metal elements derived from waste, etc., made from waste and by-products, are obtained, for example, through raw material procurement, manufacturing, logistics, sales, etc. The fourth type of CO2 emissions from energy sources is, for example, the total amount of CO2 emissions emitted until metal elements derived from waste, etc., made from waste and by-products, are turned into cement and concrete materials, through fuel combustion, electricity use, etc.

[0026] According to the metal element resource circulation system 1 of another embodiment, data on energy-origin CO2 emissions when naturally occurring metal elements are used is added to the naturally occurring metal element quantity data 12, and data on energy-origin CO2 emissions when waste-derived metal elements are used is added to the waste, etc.-derived metal element quantity data 22, thereby making it possible to create a metal element resource circulation system that makes it possible to grasp the amount of energy-origin CO2 emissions. [Industrial Applicability]

[0027] In the present invention, in the resource circulation of metal compounds, data on the amount of naturally occurring metal elements in the resources of the metal compounds and data on the amount of metal elements derived from waste, etc. are managed via a network, and by understanding the amount of naturally occurring metal elements and CO2 emissions in the movement of metal compounds (from production to disposal), it is possible to reduce the use of natural resources and the amount of CO2 emissions. [Explanation of symbols]

[0028] 1. Resource circulation system for metal compounds 10,20,30,40,50,60 nodes 11,21,31,41,51,61 Storage section 12 Naturally occurring metal element content data 22 Data on metal element content from waste, etc. 32 Metal Compound Data 100 Network

Claims

1. A resource circulation system for metal elements, comprising nodes each forming a network and managing data related to the production of metal compounds, At least one of the nodes calculates the amount of naturally occurring metal elements, among the metal elements used in the production of the metal compound, that are derived from naturally occurring metal elements, generates naturally occurring metal element amount data based on the calculated amount of the naturally occurring metal elements, and records the naturally occurring metal element amount data in the network; At least one of the nodes calculates the amount of waste-derived metal elements derived from waste or by-products as raw materials among the metal elements used in the production of metal compounds, generates waste-derived metal element amount data based on the calculated amount of the waste-derived metal elements, and records the waste-derived metal element amount data in the network; A resource circulation system for metal elements, in which at least one of the nodes links the naturally occurring carbon metal element amount data and the waste-derived metal element amount data to metal element data assigned to the produced metal compound, and records the linked metal element data in the network.

2. The resource circulation system for metal elements according to claim 1 , wherein at least one of the nodes grasps the movement of the produced metal compounds and records tracking data in the network.

3. The resource circulation system for metal elements according to claim 1 , wherein at least one of the nodes identifies a metal compound in which the ratio of the naturally occurring metal elements among the metal elements used in production is 98% or less.

4. The resource circulation system for metal elements according to claim 1 , wherein the metal compound contains at least one of an alkali metal and an alkaline earth metal.

5. The method of distinguishing between the naturally occurring metal elements and the waste-derived metal elements is to comprehensively judge from the analysis results of particle shape observation by SEM, quantification of trace elements by XRF, and quantification of trace elements by ICP-OES.

6. The metal element resource circulation system according to claim 1 , wherein the network is a blockchain network.

7. At least one of the nodes has an energy source CO when utilizing the naturally occurring metal element. ２ Adding data on emissions to the naturally occurring metal element amount data; At least one of the nodes is a CO2 source of energy when using the metal element derived from the waste, etc. ２ 2. The resource circulation system for metal elements according to claim 1, wherein data on discharge amounts is added to the data on the amounts of metal elements derived from the wastes, etc.

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