Characterization and Optimization of Fe2O3 Extraction From Red Mud Using APDC ligan

Abstract

The main component contained in the red mud is Fe₂O₃ which has the potential to be used as a catalyst in chemical reactions and can be used as a Fe₃O₄ catalyst manufacture. One method that can separate ferrous metal (Fe) from Red Mud is the extraction method using a chelating agent. This study studied the extraction of Fe₂O₃ from red mud by solvent extraction method using APDC ligands under various concentration. The variables studied are pH optimization, ligand concentration and extraction time. Analysis of red mud extraction results using FTIR, XRF, and XRD on various variables. Determination of the maximum wavelength of complex compounds formed between Fe(III) ions and ammonium pyrrolydine dithiocarbamate (APDC) ligands with pH variations of 1, 2, 3, 4, 5, and 6 in the wavelength range of 200 – 450 nm. The resulting complex compound is yellow and obtained a maximum wavelength of 347 nm. The greatest value of Fe₂O₃ absorbance is obtained at pH 1. The concentration of APDC ligands on the extraction of Fe-APDC complex compounds reached optimum conditions at a concentration of 0.5 mM with an optimum extraction time of 5 min. The FTIR spectrum formed in the Fe₂O₃ compound from the extraction is shown by the presence of vibration peaks in the regions of 447 cm-1 and 524 cm-1. Analysis of XRD Fe₂O₃ extraction results from red mud showed that the dominant phase was hematite (Fe₂O₃) followed by the minor phase of SiO_2.