resumo
Driven by environmental challenges and global movement to carbon-lean technologies, the pyroelectrolysis process for iron extraction from oxide melts is being proposed as an interesting alternative to the traditional steelmaking. Still, one of the critical issues impacting the prospects of this technology includes the development of appropriate anode materials, taking into account the extremely aggressive nature of oxide melts at very high temperatures. Here we propose a unique concept of consumable anode for pyroelectrolysis process, based on multicomponent ferrospinel-based ceramics. The electrochemical studies and post-mortem XRD/SEM/EDS analysis of the electrolysis cells have demonstrated that ceramic spinel anodes can sustain significant current densities for making the process feasible, while their consumption by interaction with Si-containing species from the molten electrolyte was found to be moderate. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
palavras-chave
TEMPERATURE; OXIDE; CONDUCTIVITY; ELECTROLYSIS; STABILITY; MAGNETITE
categoria
Materials Science
autores
Ferreira, NM; Kovalevsky, AV; Ferro, MC; Costa, FM; Frade, JR
nossos autores
Andrei Kavaleuski
Investigador principal
Jorge Ribeiro Frade
Professor Catedrático
Marta Ascenção Carmona Ferro
Técnico Superior
Nuno Miguel Freitas Ferreira
Bolseiro de pós-DoutoramentoProjectos
IERO-Iron production by Electrochemical Reduction of its Oxide for high CO2 mitigation (IERO)
RMNE-UA-National Network of Electron Microscopy (REDE/1509/RME/2005 )
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
agradecimentos
This work was supported by the European Unions Research Fund for Coal and Steel (RFCS) research program, under grant agreement RFSR-CT-2010-00002, FCT Investigator program (grant IF/00302/2012), project CICECO-Aveiro Institute of Materials POCI-01-0145-FEDER-007679 (FCT Ref. UID /CTM /50011/2013) and i3N research institute under project UID/CTM/50025/2013, financed by COMPETE 2020 Programme and National Funds through the FCT/MEC and when applicable co-financed by FEDER under the PT2020 Partnership Agreement. M.C. Ferro acknowledges support from RNME - Pole University of Aveiro and FCT project REDE/1509/RME/2005.