Hydrogen reduction of bauxite residue and selective metal recovery

Bauxite residue (BR) is an industrial by-product generated during the production of alumina from bauxite ores in Bayer process. BR environmentally hostile due to it high alkalinity and fine particle size distribution. In this work, blended with NaOH subsequently reduced hydrogen, order develop intermediate material rich magnetite sodium aluminate, by doing so, enable recovery iron, aluminium as well sodium. Several process parameters, such dosage, reduction temperature soaking time, on qualities final material, were assessed. The highest conversion degree hematite was 96 % occurred for 20 wt% addition BR, 5 vol% H2, 120 min at 500 °C. aluminum oxides transformed into water-soluble aluminate phases, a range other interesting metals enriched resulting residue. work herein demonstrates potential suggested near zero-waste BR.