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<p>Partially laterised Khondalite (PLK) refers to the waste material produced during the mining of bauxite ore. The PLK sample contains 39.6% Al<sub>2</sub>O<sub>3</sub>, 21.30% Fe<sub>2</sub>O<sub>3</sub>, 27.45% SiO<sub>2</sub>, and 1.1% TiO<sub>2</sub>. This study presents a novel method for reducing the iron (Fe) content to less than 2%, suitable for refractory industrial applications through various physical and chemical beneficiation techniques. The characterisation of the PLK feed sample was carried out using X-ray diffraction (XRD), and it shows&#xa0;that kaolinite and gibbsite are the major phases and hematite, ilmenite, and quartz are the minor phases. Since the physical beneficiation process (composite non-magnetic product) only achieved limited iron removal (5.24%), the hydrochloric acid (HCl) leaching process was adopted. The optimal leaching&#xa0;conditions for reducing iron to below 2% were found to be 80˚C, 6 molar concentration, 15% pulp density, and 3&#xa0;hrs of leaching. Kinetic analysis, based on the initial rate method, indicated a first-order reaction mechanism, with the leaching process being reaction-controlled and an activation energy (<i>E</i><sub><i>a</i></sub>) of 42.76&#xa0;kJ/mol.</p>

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Synergistic Approach for Reducing Iron Content in Partially Laterised Khondalite Rock through Physical and Chemical Beneficiation

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • S. Rout,
  • V. Aishvarya,
  • S. D. Barma,
  • C. Eswaraiah

摘要

Partially laterised Khondalite (PLK) refers to the waste material produced during the mining of bauxite ore. The PLK sample contains 39.6% Al2O3, 21.30% Fe2O3, 27.45% SiO2, and 1.1% TiO2. This study presents a novel method for reducing the iron (Fe) content to less than 2%, suitable for refractory industrial applications through various physical and chemical beneficiation techniques. The characterisation of the PLK feed sample was carried out using X-ray diffraction (XRD), and it shows that kaolinite and gibbsite are the major phases and hematite, ilmenite, and quartz are the minor phases. Since the physical beneficiation process (composite non-magnetic product) only achieved limited iron removal (5.24%), the hydrochloric acid (HCl) leaching process was adopted. The optimal leaching conditions for reducing iron to below 2% were found to be 80˚C, 6 molar concentration, 15% pulp density, and 3 hrs of leaching. Kinetic analysis, based on the initial rate method, indicated a first-order reaction mechanism, with the leaching process being reaction-controlled and an activation energy (Ea) of 42.76 kJ/mol.