Upgrading of iron ores using microwave assisted magnetic separation followed by dephosphorization leaching


CANADIAN METALLURGICAL QUARTERLY, cilt.58, ss.445-455, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 58 Konu: 4
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1080/00084433.2019.1619063
  • Sayfa Sayıları: ss.445-455


This paper describes the development of a flowsheet using a combination of sample preparation, magnetic separation (in a range 0.4-1 T), microwave treatment (in a range 0.54-0.9 kW), and leaching operations (HCl, in a range 0.25-1.25 M) for the beneficiation of iron ores (Total Fe [T-FE]: 55.48%). The work was aimed at recovering T-FE from the non-magnetic product by increasing its magnetic susceptibility through microwave treatment. It was found that goethite mineral in the non-magnetic product at a temperature of around 200(o)C was converted to paramagnetic (hematite) or ferromagnetic minerals (maghemite and magnetite) by microwave treatment and overall beneficiation recovery was improved. The phosphorus (P) content in the final product was then removed by leaching in 0.25 M HCl. The iron loss from the final concentrate during leaching was found to be 0.78%, which was negligible. Overall, a final concentrate assaying 61.78% T-FE with a recovery of 94.97%, and containing 0.04% P with 94.73% removal was obtained providing satisfactory results for use in the industry. This study gives an alternative way for possible future studies to produce an iron concentrate with a high recovery from problematic iron ores, which can be categorised due to its P content.