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Novel Reductive Extraction Process To Convert The Bio-oil Aqueous Acid Fraction Into Fuels With The Recovery Of Iron From Wastes
Published 2016 · Chemistry
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Abstract In this work, bio-oil waste AAF (aqueous acid fraction) was used to recover iron from red mud (RM) waste by a reductive extraction process. In this process, extraction of iron from RM with AAF is followed by thermal treatment of AAF-Fe extracted mixture, leading to the reduction of the Fe extracted with the production of Fe/C composites, a valuable feedstock for the steel industry, and a gas fuel fraction. Analyses by IR, UV–vis, ESI-MS, CHN, potentiometric titration, TG, TG-MS, TOC and 1 H NMR showed AAF can efficiently extract Fe 3+ present in RM waste. After extraction, the mixture AAF-Fe extracted was treated at 400, 600 and 800 °C to decompose mainly into two fractions: solid (30–40 wt%) and gas (60–70 wt%). Mossbauer and XRD analyses of the solid fraction showed the presence of reduced iron phases, e.g. Fe 2+ , Fe 0 and iron carbide, with 76% of carbon. TG-MS analyses of gas fraction showed the production of H 2 (58 mol%), C 1 –C 4 (19 mol%) and CO x (23 mol%), with potential application as a fuel.