Research on Microwave Carbon-Thermal Reduction of the Preparation Concentrate of Coarse Niobium

Abstract:

Research is tested by the ways of microwave reduction-weak magnetic separation for recycling niobium and iron based on the preparation concentrate of rough niobium. Reduction is performed in 4 temperatures which are 700°C、750°C、800°C and 850°C for the ore, then weak magnetic separation test is taken in 4 current which are 0.6A、0.8A、1.0A and 1.2A, for the purpose of analyzing effect of magnetic current on the dressing index. The results show that, in these 4 types of temperature, hematite in the ore is well reduced to magnetite. At the temperature of 850°C, part of magnetite will be further reduced to FeO. The more the magnetic current is, the higher preparation concentrate producing rate and the iron yield are, but the purity may be a little going down. The higher the reducing temperature is, the more obvious the purity will be; the yield of Nb₂O₅ in tailing ore falls down with the rising up of the magnetic current, and the purity is a little bit going up. The higher the temperature of reduction is, the more obvious the yield falls. Considering the dressing index of both preparation concentrate and tailing ore, the best dressing index should be proceeding in the current of 1.2A, at the temperature of 750°C, yield and grade of the preparation concentration iron are 91.34% and 54.66% respectively, and yield and grade for Nb₂O₅ in tailing ore are 70.63% and 7.12% respectively.

• Periodical: Advanced Materials Research (Volumes 415-417)
• Pages: 968-973
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.415-417.968
• Online since: December 2011
• Authors: Jun Chen, Bang Wen Zhang, Chen Xin Liu, Lin Chao Ke Bu
• Keywords: Carbon-Thermal Reduction, Microwave Heating, Preparation Concentrate of Coarse Niobium

References

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