钢铁研究学报(英文版), 2017, 24(2): 156-164.

Embedding direct reduction followed by magnetic separation was conducted to fully recover iron and titani-um separately from beach titanomagnetite (TTM).The influences of reduction conditions, such as molar ratio of C to Fe, reduction time, and reduction temperature, were studied.The results showed that the TTM concentrate was reduced to iron and iron-titanium oxides, depending on the reduction time, and the reduction sequence at 1 200°C was suggested as follows: Fe2.75 Ti0.25 O4→Fe2 TiO4→FeTiO3→FeTi2 O5 . The reduction temperature played a considerable role in the reduction of TTM concentrates.Increasing temperature from 1 100 to 1 200°C was beneficial to recovering titanium and iron, whereas the results de-teriorated as temperature increased further.The results of X-ray diffraction and scanning electron micros-copy analyses showed that low temperature (≤1 100°C) was unfavorable for the gasification of reductant, resulting in insufficient reducing atmosphere in the reduction process.The molten phase was formed at high temperatures of 1 250-1 300°C, which accelerated the migration rate of metallic particles and sup-pressed the diffusion of reduction gas, resulting in poor reduction.The optimum conditions for reducing TTM concentrate are as follows: molar ratio of C to Fe of 1.68, reduction time of 150 min, and reduction temperature of 1 200°C.Under these conditions, direct reduction iron powder, assaying 90.28 mass%TFe and 1.73 mass% TiO2 with iron recovery of 90.85%, and titanium concentrate, assaying 46.24 mass% TiO2 with TiO2 recovery of 91.15%, were obtained.
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引用: . 钢铁研究学报(英文版), 2017, 24(2): 156-164. doi: 
参考文献:
[1] T.A.I. Lasheen.Chemical benefication of Rosetta ilmenite by direct reduction leaching[J].Hydrometallurgy,20051/2(1/2):123-129.

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