Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Production of High-purity Magnetite Nanoparticles from a Low-grade Iron Ore via Solvent Extraction

  • Suh, Yong Jae (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Do, Thi May (Nanomaterials Science and Engineering, Korea University of Science and Technology) ;
  • Kil, Dae Sup (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Jang, Hee Dong (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Cho, Kuk (Department of Environmental Engineering, Pusan National University)
  • Received : 2014.06.12
  • Accepted : 2014.07.17
  • Published : 2015.02.01
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Abstract

We produced magnetite nanoparticles (MNPs) and a Mg-rich solution as a nano-adsorbent and a coagulant for water treatment, respectively, using a low-grade iron ore. The ore was leached with aqueous hydrochloric acid and its impurities were removed by solvent extraction of the leachate using tri-n-butyl phosphate as an extractant. The content of Si and Mg, which inhibit the formation of MNPs, was reduced from 10.3 wt% and 15.5 wt% to 28.1 mg/L and < 1.4 mg/L, respectively. Consequently, the Fe content increased from 68.6 wt% to 99.8 wt%. The high-purity $Fe^{3+}$ solution recovered was used to prepare 5-15-nm MNPs by coprecipitation. The wastewater produced contained a large amount of $Mg^{2+}$ and can be used to precipitate struvite in sewage treatment. This process helps reduce the cost of both sewage and iron-orewastewater treatments, as well as in the economic production of the nano-adsorbent.

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References

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