基于分形理论的镁质熔剂性球团矿相调控机理研究

Because of the poor ballability of the magnesia flux pellets, the high requirement of roasting temperature, the mineral phase microscopic features and the pellet performance index quantitative problems, the effects of the features such as the micro features of the raw materials, temperature, atmosphere, chemical composition and the process parameters on the ball quality, the liquid phase formation and crystallization behavior in the baking process are studied. And the characteristics of pellets and the corresponding pellet performance indexes have been obtained. Based on multi-fractal theory, GA-SVM has been adopted to establish the quantitative relation between the characteristic parameters of pellets and the macro performance indexes. Therefore, the inner relationship between the different factors and the process control parameters and the microscopic characteristics of the minerals can be studied. Then the mapping relation between the five features (such as the micro characteristics of raw materials, temperature, atmosphere, chemical composition and process control parameters) and the macro performance indexes of pellets can be established, which can help us to precisely regulate the mineralogical phase of the magnesia fluxed pellet. From the above researches, the mineralogical phase regulation mechanism of magnesia fluxed pellets has been revealed, which will provide the theoretical and the technical supports to the production of the magnesia fluxed pellets with excellent performances.

针对镁质熔剂性球团矿成球性差、焙烧温度控制要求高、矿相微观特征与球团性能指标定量化等问题，研究原料微观特征、温度、气氛、化学成分、工艺参数等因素对生球质量、焙烧过程中液相生成及结晶行为的影响规律，并获得球团矿物特征及对应的球团性能指标。基于多重分形理论，采用遗传-支持向量机算法，建立球团矿物特征参数与宏观性能指标的定量化关系，进一步挖掘不同因素及过程控制参数与矿物微观特征的内在关系，从根本上建立原料微观特征、温度、气氛、化学成分及过程控制参数与球团宏观性能指标的映射关系，从而实现镁质熔剂性球团矿相的精准调控。通过上述研究，揭示镁质熔剂性球团的矿相调控机理，为生产性能优良的镁质熔剂性球团矿提供理论与技术支撑。

通过构建磁铁精粉与熔剂交互影响的热量变化与焙烧温度的匹配及球团强度的关系，建立合理的温度-强度调控机制；基于计算机图像识别、提取技术和多重分形理论，借助遗传-支持向量机算法构建原料微观结构、温度、气氛、CaO、MgO、SiO2 与球团矿微观结构的定量关系；基于计算机图像识别、提取技术和多重分形理论，借助遗传-支持向量机算法构建球团微观结构与宏观性能间的内在关系。通过这些研究实现球团的矿相调控，为镁质熔剂性球团的发展及生产提供技术和理论支撑。