Electrolytic iron production from alkaline suspensions of solid oxides: compared cases of hematite, iron ore and iron-rich Bayer process residues

  • Abdoulaye Maihatchi Reaction and Chemical Engineering Laboratory, CNRS-University of Lorraine, 1 rue Grandville, 54000 Nancy and Extracthive, Centre de Recherche CEA, Bat. 51, 30591 Marcoule
  • Marie-Noëlle Pons Reaction and Chemical Engineering Laboratory, CNRS-University of Lorraine, 1 rue Grandville, 54000 Nancy
  • Quentin Ricoux Extracthive, Centre de Recherche CEA, Bat. 51, 30591 Marcoule
  • Frederic Goettmann Extracthive, Centre de Recherche CEA, Bat. 51, 30591 Marcoule
  • Francois Lapicque Reaction and Chemical Engineering Laboratory, CNRS-University of Lorraine, 1 rue Grandville, 54000 Nancy
Keywords: Iron production, electrodeposition, iron ores, red mud, surface reactivity

Abstract

Iron can be produced by the direct electrochemical reduction of hematite particles suspended in hot, concentrated NaOH solutions. Because various other iron sources can be considered, the present work was aimed at investigating the electrolytic treatment of the “red mud” generated by the Bayer process for alumina preparation from bauxite. Such sources contain very high amounts of impurities, in particular silicon and aluminium oxide-based minerals, in addition to other mineral phases. Electrolytic reductive treatment of the industrial red mud sample was shown to be possible but with both lower current density and current efficiency than for pure hematite. After deposition tests at a fixed current density, further experiments in simulation tests have been carried out for better understanding. In particular, hematite particles were tested with and without impurities introduced in the solution. Presence of little soluble impurities at the particle surface appear to hinder the reactivity of the suspended particles at the cathode surface, whereas side-hydrogen reaction still occurs. 

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Published
09-03-2020
Section
7th RSE SEE & 8th Kurt Schwabe symposium Special Issue