高炉初渣的关键热力学性质及物相结构演变的动力学解析

通过炉料性能控制软熔带性质，可改善高炉透气性、降低能耗和CO2排放，是炼铁领域面临的必须解决的技术难题和社会问题。根据国家自然科学基金“十三五”发展规划中的三项优先发展领域：低碳炼铁、冶金关键物化数据、选冶过程物相结构演变，申请人结合高炉炼铁工艺提出一个新思想：即关于软熔带的研究应当进入全新的第四阶段。基于此，申请人提炼出复杂炉料软熔滴落性能中的基本科学问题，针对CaO-SiO2-MgO-Al2O3-FeO渣系的关键热力学性质及物相结构演变行为展开研究。主要内容包括：（1）新方法：建立高温物性特征参数的评估方法和实验范式；（2）新数据：丰富了目前缺乏的高炉初渣的关键物化数据；（3）新思路：建立雪崩动力学模型，对高炉初渣的形成及物相结构演变行为进行动力学解析；（4）新理论：建立原始创新的高炉炉料软熔滴落性能理论体系。通过以上原创性研究，力求促进炼铁技术的进步，实现低碳绿色炼铁。

The improvement of cohesive zone can improve the permeability in blast furnace (BF), increase the productivity of hot metal and utilization of carbon, and consequently reduce the energy consumption and CO2 emission. Therefore, the reasonable controlling of cohesive zone by burden has become a key problem in ironmaking field, and also become a social issue. Based on three priority areas in "13th Five-Year" development planning of the National Science Foundation of China, "low carbon ironmaking", "key metallurgical thermodynamic data" and "phase transformation in mining-metallurgy process", a new idea was proposed by the applicants. The research on cohesive zone should be in a new era: the fourth stage. Therefore, a basic scientific project was proposed in the present work. The key thermodynamic properties and kinetic phase transformation in CaO-SiO2-MgO-Al2O3-FeO system will be investigated. The main research contents include, (1) new methods: establish the evaluation methods and experimental procedure on high-temperature properties of burden. (2) New data: the key thermodynamic data of primary slag in BF can be obtained, which are lack so far. (3) New principle: build avalanche dynamics model to better understand the behavior of phase transformation in primary slag. (4) New theory: the theoretical system on softening-melting-dripping of burden in cohesive zone of BF will be built. Therefore, the ironmaking technology may be improved by the above innovative research contents, and eventually achieving low-carbon and environmental friendly ironmaking.