Work

Analysis of the Basic Properties and Dephosphorization Mechanism of Red Mud-Based Fluxing Agents in Converter Steelmaking

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide 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 2 –Al 2 O 3 –Na 2 O red mud-based slag system were determined using FactSage calculations and slag system measurement experiments. Al 2 O 3, Na 2 O, and FeO in red mud had a melting effect, whereas low temperature, high alkalinity, and Na 2 O 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.

Source: ACS Omega

DOI: 10.1021/acsomega.5c03719

Authors: Yihe Qin, Run Yuan, Shaojun Luo, Xuewei Zhang, Xuwen He

Institutions: Tianjin University, Dongguan University of Technology, China University of Mining and Technology, China University of Mining and Technology - Beijing

Language: English

Topic: Bauxite Residue and Utilization

Subfield: Mechanical Engineering

Field: Engineering

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $1,935