Complementary approaches in characterization of secondary raw materials: a case study of H2-reduced bauxite residue
This paper was published at MEI conferences, Process Mineralogy, 2-4 November, 2022, and is written by MEI conferences, Process Mineralogy, 2-4 November, 2022
Applying commonly used characterization techniques for the secondary-type materials is generally challenging because of pre-processed treatments and particle surface contaminations. For this reason, the current work aims at presenting combination of micro-computed tomography (µ-CT), and thermomagnetic analysis (TMA) as a supplementary approach for the automated mineralogy. To this end, an H2– reduced bauxite residue was investigated in this research work to identify its complex compositions as well as grain size, particle shape, distribution of Fe-bearing components and their nature by the µ-CT and TMA qualitatively and quantitatively. The obtained results were correlated with the findings given by the scanning electron microscopy (SEM) coupled with Energy Dispersive X-Ray Analysis (EDX). The results showed that the reduced red mud was composed of only magnetite disseminated in fine gran sizes (<44 µm) which were well correlated with the automated mineralogical outcomes. The µCT presented a non-invasive 3D overview of physical properties of the studied sample which were overlooked by the automated mineralogy due to the stereological bias. Finally, it was concluded that coupled information of TMA and µ-CT provided complementary results for the secondary type materials, which was very useful for downstream processes (e.g., comminution, magnetic separation and flotation).
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Meet Dr. Ahmad Hassanzadeh! Here you can have a look into the laboratory where the experiments for this publication was done: Extracting iron from Red Mud by use of hydrogen
Learn more: Red mud