Novel reductive extraction process to convert the bio-oil aqueous acid fraction into fuels with the recovery of iron from wastes

FUEL

卷:184

Article

Mendonca, Fernanda G.¹  Gomes, Jamerson P. M.¹  Tristao, Juliana C.²  Ardisson, Jose D.³  Soares, Ricardo R.⁴  Lago, Rochel M.¹ 

[1] Univ Fed Minas Gerais, Inst Ciencias Exatas, Dept Quim, Belo Horizonte, MG, Brazil

[2] Univ Fed Vicosa, Campus Florestal, Florestal, MG, Brazil

[3] Ctr Desenvolvimento Tecnol Nucl, Belo Horizonte, MG, Brazil

[4] Univ Fed Uberlandia, Dept Engn Quim, Uberlandia, MG, Brazil

关键词: Bio-oil aqueous acid fraction;    Metal extraction;    Red mud;   

DOI  :  10.1016/j.fuel.2016.06.099

来源: Elsevier

【 摘 要 】

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 H-1 NMR showed AAF can efficiently extract Fe3+ present in RM waste. After extraction, the mixture AAF-Fe-extracted was treated at 400, 600 and 800 degrees 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. Fe2+, 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 COx (23 mol%), with potential application as a fuel. (C) 2016 Elsevier Ltd. All rights reserved.

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