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ステンレス鋼スラグ粉化防止剤の開発

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川崎製鉄技報 KAWASAKI STEEL GIHO

Vol.18 (1986) No.1

ステンレス鋼スラグ粉化防止剤の開発

Development of Stabilizer to Prevent Dusting of Stainless Steel Slag

関 明(Akira Seki) 阿曽 良雄(Yoshio Aso) 大久保 慎(Makoto Okubo) 数土 文 夫(Fumio Sudo) 石坂 邦彦(Kunihiko Ishizasa)

要旨 : 塩基度1.5 以上のステンレス鋼スラグは冷却時に粉化し，スラグヤードの環境を悪化させる とともに，スラグの二次利用を妨げている。この問題を解決するために，少量(約 0.5wt％) の安定化剤(粉化防止剤)をスラグに添加して固化する方法を開発した。安定化剤にはホウ酸 塩系を使い，溶融スラグ中に均一拡散，溶解するよう安定化剤の結晶水量をコントロールし た。結晶水量はK-BOP において，7％が最も効果的であった。得られた固化スラグは，3 箇 月エージングすることにより高炉スラグ並みの道路用骨材として使用しうることが見出さ れた。 Synopsis :

Stainless steel slag with a basicity of over 1.5 pulverized into fine particles during cooling in the past. Such pulverization was liable to cause environmental problems and disturbed further utilization of slag. To solve such problems, a stabilizing agent has been developed which can prevent pulverization of the slag with only 0.5% addition. Borate is used as a stabilizer, and the content of its crystal water is adjusted to obtain more homogeneous diffusion and resolution in molten slag. Best result is achieved for K-BOP slag at 7% crystal water content, and the stabilized stainless steel slag after 3 months aging period becomes equivalent to blast furnace slag in its quality, thereby marking it applicable to aggregate for road construction.

(c)JFE Steel Corporation, 2003

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