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(Bio)leaching Behavior of Chromite Tailings

Viviana Bolaños-Benítez, Eric D. van Hullebusch

2018enbioleachingchromitetailingsbacteriametal extraction

Abstract

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Chromite beneficiation operations in Sukinda valley (India) produce large amounts of tailings, which are stored in open air. In this study, bioleaching experiments were carried out in batch reactors with Acidithiobacillus thiooxidans or Pseudomonas putida in order to determine the potential leachability of metals contained in these tailings due to biological activity. Acidic and alkaline pH resulted from the incubation of tailings with A. thiooxidans and P. putida, respectively. Tailings were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy (SEM), and chemical extraction of Cr(VI) with KH2PO4 was performed. Mineralogical investigations showed that tailings are mainly composed of chromite, hematite, lizardite, chlorite, and goethite, which are all known as Cr-bearing phases. During the leaching with A. thiooxidans and P. putida, total Cr was initially extracted as Cr(VI) due to the presence of phosphates in the medium, and subsequently decreased because of Cr(VI) adsorption and reduction to Cr(III). Reduction was associated with bacterial activity, but also with the presence of ferrous iron. Despite the occurrence of siderophores.

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Cite This Work

@article{42a23c87-e721-481b-ba3b-fe5df241889d,
  title={(Bio)leaching Behavior of Chromite Tailings},
  author={Viviana Bolaños-Benítez and Eric D. van Hullebusch},
  year={2018},
  language={en}
}
TY  - JOUR
TI  - (Bio)leaching Behavior of Chromite Tailings
AU  - Viviana Bolaños-Benítez
AU  - Eric D. van Hullebusch
PY  - 2018
LA  - en
ER  -

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