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Effect of Raw Material Particle Size on the Direct Reduction Process of High-Phosphorus Oolitic Hematite

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Abstract

To investigate the effect of simultaneous change in particle size of raw materials (including ore, reductant, and dephosphorization agent) on the direct reduction process of high-phosphorus oolitic hematite, the experimental research of method with direct reduction and magnetic separation was conducted to investigate the effect of simultaneous change in particle size of raw materials on the final reduction products in the form of mineral composition, reduction speed, metallic iron particle morphology, phosphorus distribution, and powdery reduction iron. The results revealed that under the same conditions of reduction temperature, the raw material particle size affects the mineral composition of the final reduction product, the coarser the raw material particle size, the slower the reduction speed, the lower the metallization rate, and the larger the final metallic iron particle size formed. Under the same conditions of raw material particle size, the reduction temperature affects the mineral composition of the final reduction product, the higher the reduction temperature, the faster the reduction speed, the higher the metallization rate, and the larger the size of metallic iron particles within a certain reduction time. Neither the raw material particle size nor reduction temperature affects the form of phosphorus present in the reduction product. Both the raw material particle size and reduction temperature affect the grade of powdery reduction iron to a less extent, but affect the recovery rate and phosphorus content significantly. At the same reduction temperature, the recovery of powdery reduction iron and phosphorus content gradually decreases with the increase in raw material particle size. For the same raw material particle size, the recovery of powdery reduction iron gradually increases, and the phosphorus content gradually decreases with the increase in the reduction temperature. The results identified the effect of simultaneous changes in particle size of raw materials on the direct reduction process of high-phosphorus oolitic hematite and provide a basis for the selection of raw material particle size for the industrial application.

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Funding

This work was supported by the National Key R&D Program funded project of China (Grant No. 2021YFC2902404), National Natural Science Foundation of China (Grant No. 51874017).

Foundation for Innovative Research Groups of the National Natural Science Foundation of China.

Key Technologies Research and Development Program.

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  1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Hongda Xu, Tichang Sun, Jue Kou, Wenli Han & Shichao Wu

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  1. Hongda Xu
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Xu, H., Sun, T., Kou, J. et al. Effect of Raw Material Particle Size on the Direct Reduction Process of High-Phosphorus Oolitic Hematite. Mining, Metallurgy & Exploration 40, 109–120 (2023). https://doi.org/10.1007/s42461-022-00714-w

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