Process optimization for bio-beneficiation of a chromite concentrate by a Cr(VI) reducing native microbe (Bacillus sp.)

Dhal, B and Abhilash, and Pandey, B D (2013) Process optimization for bio-beneficiation of a chromite concentrate by a Cr(VI) reducing native microbe (Bacillus sp.). International Journal of Mineral Processing, 123 (IF-1.378). pp. 129-136.

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Abstract

The chromite concentrate generated during processing of a typical Indian chromite ore contained Cr(VI) in the range 10 to 43 mg kg- 1. Therefore, an attempt has been made for the bio-reduction of Cr(VI) using a highly tolerant Bacillus sp. isolated from chromite mine overburden to avoid the problems associated with the use of inorganic and organic reductants. Process was optimized on bench scale while varying pH, pulp density and temperature in absence / presence of media. Almost complete reduction of Cr(VI) in the chromite concentrate was achieved in ~ 12 min of incubation under the optimized conditions of pH ~ 7.0, 35 °C temperature and 60% pulp density with the Bacillus sp. (3.55 × 107 cells mL- 1). The samples (before and after bioreduction) were characterized using XRD and SEM-EDS to derive inference for reduction of chromium(VI).

Item Type:Article
Official URL/DOI:http://dx.doi.org/10.1016/j.minpro.2013.05.011
Uncontrolled Keywords:Chromite concentrate; hexavalent chromium; Bacillus sp. and Bio-reduction
Divisions:Metal Extraction and Forming
ID Code:6637
Deposited By:Mr Biswaranjan Dhal
Deposited On:07 Jun 2013 12:56
Last Modified:27 Dec 2013 18:07
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