In a significant advancement for the steel industry, researchers have unveiled promising results from a pilot study focused on the recovery of iron from high-phosphorus oolitic iron ore. This type of ore, characterized by its complex intercalation of iron and gangue minerals, has long posed challenges for efficient utilization. The study, led by Shi-chao Wu from the School of Civil and Resources Engineering at the University of Science and Technology Beijing, highlights a novel approach using coal-based direct reduction followed by magnetic separation.
As global demand for steel continues to rise, the steel industry is increasingly turning its attention to low-grade iron ores, which have historically been overlooked due to their high phosphorus content. “The effective utilization of high-phosphorus oolitic iron ore is not just a scientific challenge; it is an urgent commercial imperative,” Wu stated. This research could pave the way for new processes that enhance the economic viability of such ores, which are abundant in regions like the USA, France, Germany, Russia, and China.
The pilot-scale experiment demonstrated that under optimal conditions—specifically, a limestone dosage of 28%, anthracite dosage of 16%, reduction temperature of 1300 °C, and a reduction time of 3 hours—the iron recovery rate reached an impressive 77.47%, with a phosphorus content in the reduced iron concentrate dropping to just 0.08%. These findings suggest that not only can the steel industry access previously untapped resources, but it can also do so while meeting stringent environmental and quality standards.
The study’s implications extend beyond mere recovery rates. By improving the understanding of the dephosphorization mechanism and iron and phosphorus reduction kinetics, the research offers a pathway to more sustainable steel production methods. Wu emphasized the importance of these findings, stating, “This research not only contributes to resource efficiency but also aligns with global sustainability goals, making it a win-win for both industry and environment.”
The use of advanced techniques such as X-ray diffraction and scanning electron microscopy–energy-dispersive X-ray spectroscopy has provided new insights into the role of anthracite in the reduction process. The results indicate that while increasing anthracite dosage can enhance iron recovery, it also necessitates careful management to prevent the formation of harmful iron-phosphorus alloys.
As the steel industry grapples with the challenges of resource scarcity and environmental regulations, this research published in ‘工程科学学报’ (Journal of Engineering Science) could serve as a catalyst for innovation. The potential to transform high-phosphorus oolitic iron ore into valuable iron resources not only addresses current industry needs but also positions companies to thrive in a competitive market.
For more information on this groundbreaking research, visit University of Science and Technology Beijing.
