Journal of Northeastern University(Natural Science) ›› 2023, Vol. 44 ›› Issue (2): 206-214.DOI: 10.12068/j.issn.1005-3026.2023.02.008

• Materials & Metallurgy • Previous Articles     Next Articles

Preparation and Mechanism of α-Fe2O3 Nanoparticles by Using Iron Concentrate Powder

LI Ting1,2, PEI Wen-li1,2, CHEN Wan-qing3, TONG Bing3   

  1. 1. School of Material Science & Engineering, Northeastern University, Shenyang 110819, China; 2. Key Laboratory for Anisotropy and Texture of Materials Ministry of Education, Northeastern University, Shenyang 110819, China; 3. Fushun Hanking Aoniu Mining Co., Ltd., Fushun 113125, China.
  • Revised:2021-12-07 Accepted:2021-12-07 Published:2023-02-27
  • Contact: PEI Wen-li
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Abstract: Using commercial magnetite iron powder(Fe3O4), a purification and preparation process was designed, and α-Fe2O3 nanoparticles with a mass fraction of more than 99.5% and good dispersibility were successfully prepared. The purification, preparation process and mechanism were studied in detail. The results show that: wNaOH has a significant impact on the effect of silicon removal, when wNaOH is 39 %, the wSiO▲2 in the raw ore powder can be reduced from 1.11 % to 0.032 % to get more pure iron fine powder. With the increase of the sintering temperature, the crystallization, appearance characteristics and magnetic properties of α-Fe2O3 particles have changed. When the sintering temperature is 670℃, the comprehensive performance of α-Fe2O3 particles is the best, including higher particle crystallinity, good dispersibility and ferrimagnetic properties. By controlling the heating and stirring time of the hydroxide sediment, the grain size of the α-Fe2O3 can be effectively regulated. When the stirring time is 60min, the α-Fe2O3 with a high-quality dispersability and a average particle size of only 35.3nm is obtained.

Key words: α-Fe2O3; iron concentrate powder; nanoparticles; grain size; dispersion

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