Journal of Northeastern University Natural Science ›› 2019, Vol. 40 ›› Issue (1): 94-98.DOI: 10.12068/j.issn.1005-3026.2019.01.018

• Resources & Civil Engineering • Previous Articles     Next Articles

Pre-enrichment Behaviors of Low-Grade Donganshan Iron Ore Using Magnetic Separation

YU Jian-wen, HAN Yue-xin, LI Yan-jun, GAO Peng   

  1. School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China.
  • Received:2017-11-03 Revised:2017-11-03 Online:2019-01-15 Published:2019-01-28
  • Contact: HAN Yue-xin
  • About author:-
  • Supported by:
    -

Abstract: A pre-enrichment process of low-intensity magnetic roughing followed by high-gradient magnetic scavenging was proposed, and the effects of magnetic field intensity and grinding fineness on pre-enrichment behaviors of low-grade(w(TFe)=34.60%) Donganshan iron ore simultaneously containing hematite, magnetite and a bit of siderite were studied by XRD, chemical phase analysis of iron, and scanning electron microscope(SEM). The results showed that the optimized grinding fineness of raw ore was 70% passing 0.074mm, the magnetic field intensity for roughing, scavenging Ⅰ and Ⅱ were 120mT, 300mT and 800mT, respectively. Under the optimized conditions, a magnetic pre-concentrate assaying 42.67% iron (mass fraction) with an iron recovery of 95.45% was achieved. The analyses revealed that ferromagnetic magnetite was enriched in low-intensity magnetic concentrate, and weakly magnetic hematite and siderite were recovered successfully by high-gradient magnetic separation. However, some ultra-fine hematite particles(<10μm) were lost in tailing due to their weak magnetic trapping force.

Key words: low-grade iron ore, hematite, magnetite, magnetic separation, pre-enrichment behaviors, magnetic trapping force

CLC Number: