稀土尾矿用作炼钢脱磷助熔剂/氧化剂/造渣剂的应用基础研究

基于目前研究不能充分利用稀土尾矿中尽量多的成分的问题，本项目拟将稀土尾矿作为炼钢过程的助熔剂、氧化剂、造渣剂开展碳饱和普通铁水的脱磷实验研究，借助于扫描电子显微镜、电子探针、X射线衍射仪等检测工具，研究稀土尾矿基脱磷渣系的物化性质和熔体结构，渣系组成变化对磷在渣-金间平衡分配比、渣系磷容量及脱磷率的影响，脱磷过程中熔渣的成渣路线和磷的转化以及脱磷终渣中磷的赋存形式，脱磷渣系对镁碳砖的侵蚀等，探讨稀土尾矿基脱磷渣系组成与渣系物化性质、熔体结构及渣系脱磷能力之间的关系，剖析稀土尾矿基渣系脱磷过程中磷的转化及脱磷终渣中磷的赋存形式和磷酸盐选择性富集机理，阐明稀土尾矿基渣系脱磷过程中的成渣路线和对镁碳砖的侵蚀行为，揭示稀土尾矿基渣系用于碳饱和普通铁水脱磷的作用机理及稀土尾矿在此脱磷过程中的作用，以期实现稀土尾矿中尽量多成分的综合利用，也为稀土尾矿在炼钢过程中的造渣脱磷提供理论依据和数据参考。

Based on the problem that the present study cannot make full use of as many components as possible in rare earth tailings, this project intends to use rare earth tailings as flux, oxidant and slagging agent in steelmaking process to carry out experimental research on dephosphorization of carbon saturated common hot metal. With the help of scanning electron microscope, electron probe microanalyzer, X-ray diffractometer and other testing tools，the physical and chemical properties and melt structure of slag system for dephosphorization based on rare earth tailings will be studied, and the effect of slag composition on the equilibrium distribution ratio of phosphorus between slag and gold, phosphorus capacity and dephosphorization rate will also be studied. The slag-formation route and the transformation of phosphorus in the process of dephosphorization, the occurrence form of phosphorus in final slag of dephosphorization, and the erosion of dephosphorization slag on magnesia carbon brick will be studied. The relationship between the compositions of the slag system and the physical and chemical properties, melt structure and dephosphorization ability of the slag will be discussed. The transformation of phosphorus in the process of dephosphorization of rare earth tailing based slag system, and the occurrence and selective enrichment mechanism of phosphorus in dephosphorization final slag will be analyzed, the slag-forming route and the erosion behavior of magnesia-carbon brick in the dephosphorization process of rare earth tailing based slag system will also be clarified. The action mechanism of dephosphorization of carbon-saturated hot metal by rare earth tailing-based slag system and the role of rare earth tailing in the process will be revealed. This project can realize the comprehensive utilization of as many components as possible in rare earth tailings, and also provide a theoretical basis and data reference for slagging and dephosphorization of rare earth tailings in the process of steelmaking.