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Fractal Study on Raceway Boundary

DI Zhanxia , LUO Zhiguo , HAN Yanzhi , ZOU Zongshu , LI Jiaxin

钢铁研究学报(英文版)

The raceway has been studied extensively both theoretically and experimentally. The raceway boundary is coarse and fragmentary, but all of previous studies are based on Euclidean geometry, which regards the dimension of raceway as an integer. The fractal method of calculating raceway size, which describes boundary with extremely irregular or fragmentary characteristic, is brought forward in physical model. The fractal theory is used to calculate the fractal dimension of raceway boundary and the precise surface area of ellipsoidal raceway boundary. The result shows that the surface area based on fractal is larger than that based on Euclidean. And the surface area increases with the rise of blowing rate.

关键词: raceway boundary , physical simulation , fractal

高炉渣和转炉渣粉磨能耗和微粉特性研究

干磊,王海风,张春霞,郦秀萍,齐渊洪

钢铁

采用相对易磨性的方法比较了水淬高炉渣、滚筒转炉渣和风碎转炉渣的粉磨能耗。采用粒度分布和分形方法研究了炉渣微粉的特性。研究结果表明:水淬高炉渣易磨性最好,而滚筒转炉渣易磨性最差。水淬高炉渣微粉整体粒径分布均匀,不同粒度范围内微粉特性差异较小。而转炉渣中存在明显的难磨相,不同粒度范围内的分形分维数有明显差异。当炉渣微粉磨至很细时,单位质量滚筒转炉渣和风碎转炉渣的能耗分别约是水淬高炉渣的3.19和2.17倍。转炉渣中存在的FeO和金属铁导致其相对水淬高炉渣更难磨。滚筒转炉渣中的大量MgO·2FeO相导致其比风碎转炉渣更难磨。

关键词: 炉渣微粉 , grinding , specific energy consumption , particle size distribution , fractal

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