Evaluating and Enhancing Iron Removal via Filterable Iron Precipitates Formation during Coal-Waste Bioleaching

Prasenjit Podder, Zongliang Zhang, Rick Q. Honaker, Michael L. Free, Prashant K. Sarswat

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Iron removal via jarosite precipitate formation is a commonly used technique in various hydrometallurgical processes. Excess iron removal often becomes essential to an overall metal recovery circuit. This is particularly important to processes involving iron-bearing minerals. A technique, which involved the use of pyrite to generate acid for leaching, for iron removal is critical to enabling the process. Iron removal using CaO or similar reagents is expensive and often results in lost product. In the present study, various compounds that facilitate jarosite formation, namely Na2SO4, NH4OH, KCl, and KOH, were utilized and their effect in precipitation was observed. Visual Minteq assisted simulations were run in order to evaluate favorable conditions for iron removal. Morphology and elemental composition of precipitates were analyzed using scanning electron microscopy equipped with energy-dispersive X-ray spectroscopy, and the phase purity was identified using X-ray diffraction analysis.

Original languageEnglish
Pages (from-to)632-642
Number of pages11
Issue number4
StatePublished - Dec 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors.


  • REEs
  • bioleaching
  • coal waste
  • iron removal
  • jarosite
  • recycling

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Engineering (miscellaneous)


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