Abstract: The effects of microwave treatment on the fractal characteristics of blast furnace sludge and relative mechanism were studied. Particle size distribution, morphology and chemical changes were analyzed. The results show that the morphology features of iron bearing sinter and coke particles, being the main constituents of blast furnace sludge particles, were remarkably changed by microwave heating. So that the surface roughness, porosity and specific surface area on the modified particle surface were all increased obviously. Combining fractal model, the fractal dimensions of sinter, coke particles and the other subsidiary components in the sludge increased from 1.27, 1.14 and 1.57 to 1.51, 1.32 and 1.61, respectively. The microwave modification mechanism on the sludge particles was related to two aspects: (1) different mineral phases existing in the sludge particles inclined to dissociate each other due to their different microwave absorbability, and (2) some recombination or reconstruction of matters or structure resulted in structural defects, which had great influences on the surface characteristics and chemical properties.

Key words: blast furnace sludge, microwave modification, morphology, fractal theory, fractal dimension

摘要： 对马钢高炉瓦斯泥颗粒进行了粒度分布和微观形貌的测定和表征，并结合数学模型研究了其微波改性前后的分形特性. 结果表明，微波改性后瓦斯泥颗粒形貌出现粗糙度增大、孔隙结构变化明显、比表面积增大、形状更不规则化的特征. 结合分形模型得到瓦斯泥中3种主要颗粒(含铁为主的烧结矿颗粒、焦炭颗粒和其他次要组分颗粒)的分形维数分别由改性前的1.27, 1.14, 1.57增加到1.51, 1.32, 1.61. 微波处理后高炉瓦斯泥颗粒分形维数增大的内在机制为，微波加热过程中颗粒内各矿物因吸波能力不同而发生相解离，同时产生物质与结构的重组，进而增加结构缺陷、改变颗粒的分形特性.

关键词: 高炉瓦斯泥, 微波处理, 形貌, 分形理论, 分形维数