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Comprehensive Utilization of Iron and Phosphorus from High-Phosphorus Refractory Iron Ore

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Abstract

An innovative process of coal-based reduction followed by magnetic separation and dephosphorization was developed to simultaneously recover iron and phosphorus from one typical high-phosphorus refractory iron ore. The experimental results showed that the iron minerals in iron ore were reduced to metallic iron during the coal-based reduction and the phosphorus was enriched in the metallic iron phase. The CaO-SiO2-FeO-Al2O3 slag system was used in the dephosphorization of metallic iron. A hot metal of 99.17% Fe and 0.10% P was produced with Fe recovery of 84.41%. Meanwhile, a dephosphorization slag of 5.72% P was obtained with P recovery of 67.23%. The contents of impurities in hot metal were very low, and it could be used as feedstock for steelmaking after a secondary refining. Phosphorus in the dephosphorization slag mainly existed in the form of a 5CaO·P2O5·SiO2 solid solution where the P2O5 content is 13.10%. At a slag particle size of 20.7 μm (90% passing), 94.54% of the P2O5 could be solubilized in citric acid, indicating the slag met the feedstock requirements in phosphate fertilizer production. Consequently, the proposed process achieved simultaneous Fe and P recovery, paving the way to comprehensive utilization of high-phosphorus refractory iron ore.

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Acknowledgement

The authors gratefully acknowledge the National Natural Science Foundation of China (Grant No. 51604063) for funding this research.

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Authors and Affiliations

  1. School of Resources and Civil Engineering, Northeastern University, No. 3-11, Wenhua Road, Heping District, Shenyang, 110819, Liaoning, China

    Yongsheng Sun, Qi Zhang, Yuexin Han, Peng Gao & Guofeng Li

Authors
  1. Yongsheng Sun
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  2. Qi Zhang
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  3. Yuexin Han
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  4. Peng Gao
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  5. Guofeng Li
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Corresponding author

Correspondence to Yongsheng Sun.

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Sun, Y., Zhang, Q., Han, Y. et al. Comprehensive Utilization of Iron and Phosphorus from High-Phosphorus Refractory Iron Ore. JOM 70, 144–149 (2018). https://doi.org/10.1007/s11837-017-2637-7

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  • DOI: https://doi.org/10.1007/s11837-017-2637-7

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