Qin Yihe, Yuan Run, Luo Shaojun, Zhang Xuewei, He Xuwen
School of Environment and Civil Engineering, Dongguan University of Technology, Daxue Road, Dongguan 523000, China.
School of Earth System Science, Tianjin University, Weijin Road, Tianjin 300072, China.
ACS Omega. 2025 Sep 4;10(36):41146-41157. doi: 10.1021/acsomega.5c03719. eCollection 2025 Sep 16.
Studying the slag and phosphorus removal efficiency of red mud pellets on an industrial scale is crucial for reducing costs and increasing efficiency in the steelmaking process and optimizing the use of red mud as a high-value resource. This study explored the effects of the binder dosage, pellet moisture, drying temperature, red mud particle size, and other parameters on the compressive strength of red mud pellets in the pellet preparation process. The formation mechanism of red mud pellets was also explored. The compressive strength of red mud pellets is 572.83 N/P under optimal parameter conditions, which meets the production requirements. New composite binders were adsorbed onto the surface of red mud through hydrophilic groups, such as hydroxyl groups, thereby strengthening the interaction between particles. The basic physical properties of a CaO-FeO-SiO-AlO-NaO red mud-based slag system were determined using FactSage calculations and slag system measurement experiments. AlO, NaO, and FeO in red mud had a melting effect, whereas low temperature, high alkalinity, and NaO improved the fluidity of the flux system and promoted steel dephosphorization. Industrial application tests showed that red mud-based slag agents have industrial application prospects. Industrial application experiments showed that the red mud-based slag system can reduce the temperature of molten steel by 46.72 °C and increase the phosphorus removal rate by 12.5%. The use of red mud flux can save 3.52% per ton of steel in the steelmaking process compared to the original process. This study provides theoretical guidance and technical support for the production and practical application of red mud-based slag agents.
在工业规模上研究赤泥球团的脱渣和脱磷效率，对于降低炼钢过程中的成本、提高效率以及优化赤泥作为高价值资源的利用至关重要。本研究探讨了粘结剂用量、球团水分、干燥温度、赤泥粒度等参数在球团制备过程中对赤泥球团抗压强度的影响。还探讨了赤泥球团的形成机理。在最佳参数条件下，赤泥球团的抗压强度为572.83N/P，满足生产要求。新型复合粘结剂通过羟基等亲水基团吸附在赤泥表面，从而增强颗粒间的相互作用。利用FactSage计算和炉渣系统测量实验确定了CaO-FeO-SiO-AlO-NaO赤泥基炉渣系统的基本物理性能。赤泥中的AlO、NaO和FeO具有熔化作用，而低温、高碱度和NaO提高了熔剂系统的流动性并促进了钢的脱磷。工业应用试验表明，赤泥基造渣剂具有工业应用前景。工业应用实验表明，赤泥基炉渣系统可使钢水温度降低46.72℃，脱磷率提高12.5%。与原工艺相比，使用赤泥熔剂在炼钢过程中每吨钢可节省3.52%。本研究为赤泥基造渣剂的生产和实际应用提供了理论指导和技术支持。
