Beneficiation of micro-fine magnetic minerals from reductive iron ore with ultrafine grinding-magnetic flocculation separation

ABSTRACT

Beneficiation of micro-fine magnetic minerals from reductive iron ore was investigated. Sample characteristics and main force analysis of magnetic floc were conducted. The results indicated that the iron phase in reductive iron ores was predominantly metallic iron (below 20 μm). By applying ultrafine grinding-magnetic flocculation separation (MFS) to the raw ore (29.85% Fe), a concentrate assaying 74.12% Fe with 81.45% iron recovery was obtained. The iron recovery increased by 6.68% compared with the conventional magnetic separation (CMS). The high efficiency in beneficiation may be attributed to an increase in magnetic force on the micro-fine iron minerals in the form of flocs.

KEYWORDS:

• Reductive iron ore
• micro-fine
• magnetic minerals
• ultrafine grinding
• magnetic flocculation separation

Funding

The authors would like to express their gratitude for the financial support from Regions of the National Natural Science Foundation of China (Grant No. 51664027) and National Science Foundation for Young Scientists of China (Grant No.51404118) and the authors are grateful to the Kunming Institute of Precious Metals and the Analysis and Testing Centre in Kunming University of Science and Technology for its technical support (2016T20110055).

Additional information

Funding

The authors would like to express their gratitude for the financial support from Regions of the National Natural Science Foundation of China (Grant No. 51664027) and National Science Foundation for Young Scientists of China (Grant No.51404118) and the authors are grateful to the Kunming Institute of Precious Metals and the Analysis and Testing Centre in Kunming University of Science and Technology for its technical support (2016T20110055).