Distribution of scandium in red mud and extraction using Gluconobacter oxydans

Abhilash, and Hedrich, Sabrina and Schippers, Axel (2021) Distribution of scandium in red mud and extraction using Gluconobacter oxydans. Hydrometallurgy, 202 (3.356).

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The aim was to study bioleaching of rare earth elements from red mud by a chemoorganotrophic microorganism, and to investigate the microbe-mineral interactions. Red mud is a promising resource for scandium, whose concentration was 92 and 54 mg/kg in two samples from Germany and India, respectively; however, both showed appreciably high concentration of zirconium. A gluconic acid-producing bacterium, Gluconobacter oxydans (DSMZ 46616), was used in the bioleaching experiments under parametric variation of inoculum concentration, pulp density, and culture adaptation. At a solid load of 10% (w/v) red mud with 10% (v/v) bacterial inoculum at 37 ◦C, a maximum solubilisation of 83% and 94% Sc was observed after 18–20 d of incubation for Indian and German red mud, respectively. The total amount of gluconic acid excreted by the bacteria increased with an increase in pulp density up to 10% (w/v). After bioleaching, SEM-EDAX analysis of the solid residue depicted enrichment of zirconium associated with the silicate matrix, and the bacterial cells were adhered to the major mineral matrix.

Item Type:Article
Official URL/DOI:https://doi.org/10.1016/j.hydromet.2021.105621
Uncontrolled Keywords:Gluconobacter oxydans, Red mud, Bioleaching, Scandium
Divisions:Metal Extraction and Forming
ID Code:8353
Deposited By:Dr. Abhilash .
Deposited On:11 May 2021 16:17
Last Modified:11 May 2021 16:17

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