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    • 52. 发明申请
    • METHOD FOR REDUCING TO METALLIC CHROMIUM THE CHROMIUM OXIDE IN SLAG FROM STAINLESS STEEL PROCESSING
    • 用于从不锈钢加工中将金属铬氧化物还原成金属铬的方法
    • US20080156144A1
    • 2008-07-03
    • US11964130
    • 2007-12-26
    • Sang-Yuel JUNGYong Hwan KIMSun-Min BYUNSang-Beom LEEHyun-Chul CHUN
    • Sang-Yuel JUNGYong Hwan KIMSun-Min BYUNSang-Beom LEEHyun-Chul CHUN
    • C22B7/04
    • C22B7/04C21C5/5264C21C5/54C21C7/0037C22B5/04C22B21/0069C22B34/32Y02P10/216
    • The present invention relates to a method for reducing to metallic chromium the chromium oxide material found in slag formed in an electric arc furnace during the process of making stainless steel in that furnace. The chromium oxide content of the slag can be effectively reduced to a relatively low concentration by maintaining the slag in a liquid phase while at the same time blowing into the furnace via a carrier gas certain amounts of powdered aluminum dross. In particular, powdered aluminum dross can be blown into the furnace in amounts ranging from about 10 to 20 kg of dross per ton of molten steel in the furnace. Alternatively, powdered aluminum dross can be blown into the furnace in a thrown-in amount which satisfies the equation: 0.5≦[Thrown-In Al dross (ton)×100]/[Slag in Furnace (ton)×Cr2O3 (wt %)]≦1.0. Via such a method used during the stainless steel making process, the recovery of valuable chromium and the rate of chromium oxide reduction can be increased. Further, the cost of the stainless steel making process can be reduced by using relatively inexpensive powdered aluminum dross as the chromium oxide reducing agent instead of more expensive conventional reducing agents.
    • 本发明涉及在该炉中制造不锈钢的过程中,将电弧炉中形成的炉渣中的铬氧化物材料还原成金属铬的方法。 通过将渣保持在液相中,同时通过载气吹入一定量的粉状铝渣,同时将炉渣的氧化铬含量有效地降低到相对低的浓度。 特别地,粉末状铝渣可以在炉中以每吨钢水约10至20kg浮渣的量吹入炉中。 或者,粉末状的铝渣可以以满足以下等式的投入量吹入炉中:<?in-line-formula description =“In-line formula”end =“lead”?> 0.5 <= [Thrown- 在铁渣(吨)×100] / [炉渣(吨)中的铁渣xCr 2 O 3(wt%)] <= 1.0 < description =“在线公式”end =“tail”?>通过在不锈钢制造过程中使用的这种方法,可以提高有价铬的回收和氧化铬还原速率。 此外,通过使用相对便宜的粉状铝渣作为氧化铬还原剂代替更昂贵的常规还原剂,可以降低不锈钢制造工艺的成本。