鉄スクラップ脱銅法 : その背景と日本鉄鋼業の将来

概要

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In 1992, the ratio of electric-furnace steel to the total crude steel production has increased to approximately 30% in Japan. Because of a number of advantages of EAF in comparison with BOF, an increasing trend in the production of EAF-steel would still continue even into the next century.In terms of steel specifications and product quality, however, EAF-steel has not been without problems. Currently, the EAF-steelmakers produce primarily bars and structrual shapes, while thin plate or sheet steel cannot be made via EAF. Because of such restrictions, in the near future, i.e., between 2005 and 2015, it is highly anticipated that approximately 15 millions tons of scrap may not be utilized as a source for EAF-steelmaking, resulting in serious problems with respect to environmental and health considerations within Japans local community.In this article, a critical review is given to (1) current research activities with respect to the removal of copper, which impairs the production of sheet steel by EAF, (2) future trend in the recycling of ferrous scrap with a particular emphasis on shredded scrap, which is generated from used automobiles, and (3) long-term strategies for maintaining better partnership between Japan and foreign countries, especially U.S.A.A brief summary on the authors new process for copper removal from solid ferrous scrap by using molten aluminium is also given.
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