JOURNAL ARTICLE

A study on non-isothermal hydrogen reduction of different bauxite residue–calcium pellets for feasible recoverability of iron and alumina.

  • Published In: Mineral Processing & Extractive Metallurgy, 2025, v. 134, n. 2. P. 79 1 of 3

  • Database: Academic Search Ultimate 2 of 3

  • Authored By: Kar, Manish Kumar; Hassanzadeh, Ahmad; Eijk, Casper van der; Kowalczuk, Pshem; Aasly, Kurt; Safarian, Jafar 3 of 3

Abstract

This article focuses on a sustainable process for recovering iron and alumina from bauxite residue (BR) through non-isothermal hydrogen reduction of BR-calcite pellets, followed by alkaline leaching and magnetic separation. Two pellet types—self-hardened and sintered—were studied, with sintered pellets showing higher mechanical strength and alumina recovery (72.9%), while self-hardened pellets achieved greater iron recovery (43%) due to iron particle clustering. The non-isothermal reduction at 1000 °C produced larger iron particles (4–5 µm) compared to isothermal methods, enhancing iron recoverability, though particle size remains a challenge for conventional separation. The study demonstrates effective recycling of BR and suggests further optimization and multi-stage magnetic separation for industrial-scale application.

Additional Information

  • Source:Mineral Processing & Extractive Metallurgy. 2025/06, Vol. 134, Issue 2, p79
  • Document Type:Article
  • Subject Area:Geology
  • Publication Date:2025
  • ISSN:2572-6641
  • DOI:10.1177/25726641251324041
  • Accession Number:184999514
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