Preparation of a mixed Al/Sc nano-oxide derived from the bauxite residue (red mud) via the sulfuric acid roasting–leaching–precipitation process

Authors

  • Razieh HABIBPOUR Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran 3313193685, Iran https://orcid.org/0000-0001-9371-4974
  • Eslam KASHI Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran 3313193685, Iran
  • Mehdi JANFADA Research and Development Unit, Jajarm Alumina Complex, Jajarm 94411-11137, Iran

DOI:

https://doi.org/10.55713/jmmm.v31i1.962

Keywords:

Bauxite residue, Red mud, Sulfuric acid roasting, Precipitation, Al/Sc nano-oxide

Abstract

In this study, three methods were used and compared for the selectable extraction of aluminum/ scandium with the least amount of iron in red mud (RM) samples from the Iran alumina plant in Jajarm as follows: 1) RM direct acid leaching with H2SO4, 2) RM washing with hydrochloric acid and oxalic acid before leaching with H2SO4, and 3) RM sulfuric acid roasting-leaching-precipitation.  The aim was to extract the highest amount of scandium while preventing the leaching of other metals, especially iron. Due to any discriminative features, the selective separation of Al/Sc with methods 1 and 2 was impossible practically. While, method 3 resulted in 73.7% of extracted scandium under optimal conditions with only 0.6% of iron found in the final product. The characterization of the final oxide product was done via inductively coupled plasma mass spectrometry (ICP-MS) and energy-dispersive X-ray analysis (EDX). The morphology of the oxide product was examined by field emission scanning electron microscopy (FE-SEM). This mixture oxide had a nanosize spherical shape and was distributed uniformly. The pH of the remaining red mud after the acid roasting-leaching-precipitation method was 8, which was far more environmentally desirable than the primary red mud with a pH = 12.

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Published

2021-03-28

How to Cite

[1]
R. HABIBPOUR, E. KASHI, and M. JANFADA, “Preparation of a mixed Al/Sc nano-oxide derived from the bauxite residue (red mud) via the sulfuric acid roasting–leaching–precipitation process”, J Met Mater Miner, vol. 31, no. 1, Mar. 2021.

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Original Research Articles