Silicon Rich Iron Alloy from Bauxite Residue .

The iron oxide (typically 20–50%) contained in bauxiteresidue (BR) can be recovered as pig iron. But this is not economically viable due to the low market price of pig iron. Silicon rich iron alloys have higher value than pig iron, and BR typically contains 5–15% silicon oxide. To increase the value of the produced metal, it is attempted to maximise the silicon content of iron alloys produced from BR. This option has been explored with experiments and thermodynamic models (FactSage) focusing on BR from one legacy site and three alumina refineries, obtaining a maximum of 17 wt.% Si in experimentally produced alloys. The paper discusses the thermodynamics around