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Direct reduction of low-grade lateritic bauxite was studied at high temperature to recover Fe and beneficiate Al2O3 slag. The results show that a metallization rate of 97.9% and a nugget recovery rate of 85.1% can be achieved when the reducing and melting temperatures are 1350 and 1480°C, respectively. Moreover, a higher-grade calcium aluminate slag(Al2O3 = 50.52wt%) can also be obtained, which is mainly composed of α-Al2O3, hercynite(Fe Al2O4), and gehlenite(Ca2Al2SiO7). In addition, high-quality iron nuggets have been produced from low-grade lateritic bauxite. The nugget is mainly composed of iron(93.82wt%) and carbon(3.86wt%), with almost no gangue(slag).
Direct reduction of low-grade lateritic bauxite was studied at high temperature to recover Fe and beneficiate Al2O3 slag. The results show that a metallization rate of 97.9% and a nugget recovery rate of 85.1% can be achieved when the reducing and melting temperatures are 1350 and 1480 ° C, respectively. Moreover, a higher-grade calcium aluminate slag (Al2O3 = 50.52 wt%) can also be obtained, which is mainly composed of α-Al2O3, hercynite (FeAl2O4), and gehlenite (Ca2Al2SiO7) addition, high-quality iron nuggets have been produced from low-grade lateritic bauxite. The nugget is mainly composed of iron (93.82 wt%) and carbon (3.86 wt%), with almost no gangue (slag).