Journal
ISIJ INTERNATIONAL
Volume 52, Issue 10, Pages 1757-1763Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.52.1757
Keywords
iron ore; beneficiation; high phosphorus limonite ore; sodium carbonate; carbothermic reduction; metallic iron; ultrafine grinding
Categories
Funding
- Science and Technology Department of Yunnan of China [2006GG01]
- National Natural Science Foundation of China [u0837602]
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The characteristics of Huimin high phosphorus limonite ore and the beneficiation of this iron ore by sodium-carbonate-added carbothermic reduction, ultrafine grinding and magnetic separation were investigated. Iron particle size in reduced ore without Na2CO3 additive is tiny and the fayalite is abundant. It is indicated that the formation of fayalite is the main hindrance to accelerate the reduction of limonite. With a mass ratio of Na2O3 to ore of 10% additive, the reduction of limonite can be reinforced. The reinforcing affect may be caused by the increase of the reducing reaction activity of FeO and the acceleration of the canon gasification reaction rate. Fluorapatite were not reduced in the low temperature reduction process and entered to gangue phases, after ultrafine grinding-magnetic separation process, a qualified iron concentrate with 76.47% Fe, a recovery of 73.20% is obtained with simultaneous decrease in the phosphorus cor tent down to 0.25%.
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