マルコフ連鎖モデルを適用した鉄エレメントのライフサイクルにおける平均使用回数ならびに社会での平均滞留時間の解析手法の構築(鉄のマテリアルフロー)(Part-2. 鉄鋼業と循環型社会)(<特集>鉄の技術と文化および循環型社会)

概要

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The life cycle of steel begins in the mining of iron-ore from the earth Steels are produced in steel works and used in various products Some of the steels are recycled at the end-of-life of the products and used as a resource for the production of steel products in electric furnace, while the other steels are used just one time in products and go into landfill As the recycle ratios of steel from used products increase, the average number of times of use and residence time of Iron element that comes into society as iron ore and goes out from the society as landfill will increase So these values indicate "sustainability of material use" in a society In this work, a methodology was developed for analyzing the average number of times of use and residence time of Iron element in a society by applying Markov chain model It was calculated that the average number of times of use and residence time of Iron element in a society based on the material flow of steels in Japan in 2000 are 2 67 and 62 9 years, respectively Both of these values are significantly dependent on the recycle ratio of steels from civil & building facilities and automobiles It was indicated that the average number of times of use and residence time of Iron element in a society would increase up to 3 17 and 75 8 if the recycle ratio of steels from civil and building facilities increase from 50 to 60%
社団法人日本鉄鋼協会の論文
2005-01-01