Separation and Recovery of Iron and Niobium from Nb-bearing Tailings
Received:September 17, 2014  Revised:September 27, 2014
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DOI:10.3969/j.issn.1007-7545.2015.02.002
KeyWord:Nb-bearing tailings; carbothermic reduction; magnetic separation; Bayan Obo
           
AuthorInstitution
ZHANG Xun-di 东北大学 多金属共生矿生态化冶金教育部重点实验室
LIU Cheng-jun 东北大学 多金属共生矿生态化冶金教育部重点实验室
YU Zhu-ying 东北大学 多金属共生矿生态化冶金教育部重点实验室
YUAN Hao-zhi 东北大学 多金属共生矿生态化冶金教育部重点实验室
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Abstract:
      Iron recovery and niobium enrichment from Nb-bearing tailings in Bayan Obo were investigated by carbothermic reduction and magnetic separation based on thermodynamic analysis. The results show that iron oxide can be selective reduced at 1 000~1 100 ℃ with carbon as reductant. Separation of iron concentrate and niobium minerals could be realized by reduction roasting at 1 100 ℃ for 0.5 h and then wet grinding under magnetic field strength of 50 mT. Iron grade in magnetite iron concentrate is 84.82% with iron recovery rate of 81.95%. Nb2O5 grade in magnetic tailings is 1.98% with niobium recovery rate of 95% above.
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