含铁粉尘碳酸化球团微孔隙分形特征研究

Research on micropore fractal characteristics of carbonation pellets of ferrous dust

含铁粉尘碳酸化球团微观孔结构对其宏观特性具有显著影响。本文采用分形维数研究CaO含量、造球时间、反应温度和CO_2分压对孔结构特征的影响规律。结果表明:随着CaO含量升高,凝胶孔含量增多,孔结构复杂程度增加,分形维数升高;延长造球时间,分形维数增大;生球孔隙比表面积和转化率在一定范围内随着分形维数的变大而增大;提高反应温度或CO_2分压,分形维数随之降低。

The pore structure of carbonation pellets of ferrous dust has significant effect on its macroscopic performance. The effects of CaO content, pelletizing time, reaction temperature and CO2 partial pressure on the fractal dimension are investigated. The results show that, with the rising of CaO content, the number of gel pore and the complexity of the pore structure and the fractal dimension increase. With the pelletizing time being lengthened, the fractal dimension increases. The specific surface area and the conversion rate of green pellets pores increase with the increasing of fractal dimension within a certain range. By increasing reaction temperature or CO2 partial pressure, the fractal dimension decreases.