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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol. 32(2000) No.4 ■■■■■■■■■■■■■■■■■■■ |
| 循環型社会に貢献する鉄鋼スラグの再資源化技術 Slag Re-utilization Technologies in Kawasaki Steel Contributing to Establishment of Recycling-based Society 櫻谷 敏和(Toshikazu Sakuraya) |
| 要旨 : 日本が目指す循環経済社会における鉄鋼業の課題の一つは，大量に副生する鉄鋼スラグの再資源化である。川崎製鉄では製鋼プロセスの変革を踏まえた製鋼スラグの製鉄工程内リサイクルを強力に推進してきた。転炉スラグ全量の焼結工程リサイクルを実現に加えて，ステンレス鋼製精錬スラグの再資源化システムを世界に先駆けて確立した。製鋼スラグの一部と高炉スラグは有用な土木建築資材として活用すべく，利用技術開発と関連業界との連携確保に留意した活動を展開している。天然資材の節減，天然資材にない特性の活用の二つの視点から，需要家に評価される分野への展開を重視している。高炉スラグに関しては，セメント素材，軽量土木資材への利用を重視するとともに，断熱性ロックウール製造に注力している。製鋼スラグについては港湾土木資材としての活用を目指す開発を推進している。 |
| Synopsis : Japanese society is now moving to establish a recycling-based society. One of the most important tasks of Japanese steel industry to contribute to this movement is to develop technologies and systems, by which the full re-utilization of iron slag and steelmaking slag is realized. In Kaswaski Steel, the recycling of steelmaking slag in ironmaking process as valuable resources has been strongly investigated based on innovations in steelmaking technologies. Based on the recycling system established several years ago, all the convertor slag has been re-utilized in a sintering process. A full re-utilization system for stainless steel refining slag has also been constructed recently. The remaining parts of the steelmaking slag and all of the ironmaking slag are used as valuable materials for civil engineering and construction works. For improving slag utilization in these fields, R&D activities by ourselves with the collaboration of several partners have been carried out. Contribution to the preservation of natural resources is the one of the key words for these activities, and the presentation of new technologies, which can be realized by the special features of slag materials, is another one. Utilization of ironmaking slag as a material for a high performance cement, light weight aggregates and rockwool suitable for high performance heat insulating product, is considered to achieve the key words. Intensive works for realizing the usage of steelmaking slag in port construction works are continued. |
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