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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

F. Mendonça, Jamerson Peixoto de Matos Gomes, J. Tristão, J. Ardisson, R. Soares, R. M. Lago
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.
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