Research on efficient utilization of high-phosphorus oolitic hematite for iron enrichment and dephosphorization by hydrogen mineral phase transformation

Abstract

The paper proposes the innovative technology of hydrogen mineral phase transformation–magnetic separation–acid leaching for iron enrichment and dephosphorization, based on the mineralogical characteristics of high phosphorus oolitic hematite and difficulties that make it difficult to utilize traditional beneficiation for separation. The influences of the reduction temperature, reduction time, and reductant concentration during hydrogen mineral phase transformation on the separation index of high phosphorus oolitic hematite were investigated. The optimal conditions were determined to be a reduction time of 25 min with a reductant concentration of 30% and a reduction temperature of 540 °C, under which an iron grade of 65.05%, iron total recovery of 81.86%, and phosphorus content of 0.081% were obtained for the iron concentrate. The evolution of mineral phases, magnetic properties, and mineral microstructures was investigated by XRD, VSM, XPS, SEM, and BET. The results provide new references of technology and theoretical support for the efficient utilization of refractory iron ores.

Keywords

high-phosphorus oolitic hematite / hydrogen mineral phase transformation / magnetic properties / microstructure / efficient utilization

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