MgO在熟料中的形态演化、作用机制及熟料的性能优化研究

随着优质石灰石矿山资源的日益短缺，大量高镁的低品位石灰石正在成为水泥企业不得不使用的原材料，亟需解决MgO引发的熟料生产不稳定和性能裂化的难题。控制和优化熟料中MgO的作用行为是解决问题的根本和关键所在。但熟料的组成结构极其复杂，且熟料中MgO的存在形态及作用方式多样，MgO的作用规律和机制至今尚不明确。因此，申请人基于前期工作，从研究不同镁质矿物中MgO在熟料中的形态演化过程入手，深入研究液相、铁相与MgO的相互影响关系，以及高温形成和冷却析晶形成方镁石的时空作用关系，探讨MgO与微量元素的复合作用规律和机制，从熟料烧成、阿利特晶型、方镁石以及熟料易磨性等多个层次和方面，阐明熟料中MgO的作用规律和机制，探索控制和优化熟料性能的方法，为安全使用低品位高镁石灰石和高镁低钙熟料的生产等提供技术支撑。此外，项目成果还将极大地丰富和发展水泥熟料化学的基础理论，具有重要的理论价值和实际意义。

Cement industry in China is now facing a serious shortage of high-quality limestone mining resources. A large number of low-grade high-magnesium limestone is becoming raw materials for cement production. Thus, it is urgent to control the behavior of MgO in clinker to improve the stability of the manufacturing process and the performance of clinker with high MgO content. However, the rules of MgO behavior and the mechanism are still not clear due to the complexity of the structure of clinker and the diversity of the existing forms and roles of MgO in clinker. Based on our previous work, this project will begin with studying the form evolution of MgO in clinker for different kinds of magnesium compound from the raw material. Secondly, the relationship between liquid, ferrite phase and MgO will be studied, and the formation process of periclase will be investigated and thoroughly discussed. Thirdly, the combined influence of MgO with various minor elements (such as F, S, P and so on) on clinker will be studied. Finally, by taking into account of changes in the clinker mineral composition, alite crystal forms, periclase and clinker grindability as a whole, the effects of MgO on the hydration property of clinker will be evaluated. The role and mechanism of MgO in clinker will be stated. Attempts will be made to regulate the existing form and behavior of MgO in clinker to optimize the performance of high magnesium Portland cement clinker. The results will provide technical support for the use of low grade high-magnesium limestone and the production of low calcium Portland cement clinker with high magnesium. In addition, it will greatly enrich and develop the basic theory of cement clinker chemistry, which has important theoretical and practical values.