ժҪ Embedding direct reduction followed by magnetic separation was conducted to fully recover iron and titanium 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 1200��C was suggested as follows: Fe2��75Ti0��25O4��Fe2TiO4��FeTiO3��FeTi2O5. The reduction temperature played a considerable role in the reduction of TTM concentrates. Increasing temperature from 1100 to 1200��C was beneficial to recovering titanium and iron, whereas the results deteriorated as temperature increased further. The results of X��ray diffraction and scanning electron microscopy analyses showed that low temperature (��1100��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 1250-1300��C, which accelerated the migration rate of metallic particles and suppressed 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 1200��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.
Abstract��Embedding direct reduction followed by magnetic separation was conducted to fully recover iron and titanium 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 1200��C was suggested as follows: Fe2��75Ti0��25O4��Fe2TiO4��FeTiO3��FeTi2O5. The reduction temperature played a considerable role in the reduction of TTM concentrates. Increasing temperature from 1100 to 1200��C was beneficial to recovering titanium and iron, whereas the results deteriorated as temperature increased further. The results of X��ray diffraction and scanning electron microscopy analyses showed that low temperature (��1100��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 1250-1300��C, which accelerated the migration rate of metallic particles and suppressed 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 1200��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.
��������:studies on mechanism of titanium and iron separation from titanomagnetite by using the direct reduction roasting and magnetic separation
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E-mail: suntc@ces.ustb.edu.cn
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Chao Geng,Ti-chang Sun*,You-wen Ma,Cheng-yan Xu,Hui-fen Yang. Effects of embedding direct reduction followed by magnetic separation on recovering titanium and iron of beach titanomagnetite concentrate[J]. �й������ڿ���, 2017, 24(2): 156-164.
Chao Geng,Ti-chang Sun*,You-wen Ma,Cheng-yan Xu,Hui-fen Yang. Effects of embedding direct reduction followed by magnetic separation on recovering titanium and iron of beach titanomagnetite concentrate. Chinese Journal of Iron and Steel, 2017, 24(2): 156-164.
2017, Vol. 24 
