Extraction of REEs from Blast Furnace Slag by Gluconobacter oxydans

Abhilash, and Hedrich, Sabrina and Meshram, Pratima and Schippers, Axel and Gupta, A and Sen, Subhadra (2022) Extraction of REEs from Blast Furnace Slag by Gluconobacter oxydans. Minerals, 12(6) .

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Granulated blast furnace slag (GGBFS) is a potential resource of rare earth elements (REEs), and due to the complex mineralogy, extraction by conventional hydrometallurgical process makes it an acid-consuming method. Bioleaching is thus investigated using a chemo-organotrophic bacterium Gluconobacter oxydans (DSMZ 46616) for REE extraction from GGBFS containing 157 ppm Ce, 90 ppm La, 71 ppm Nd and 40 ppm Er, hosted in a Ca-Al-Si matrix. The gluconic acid generation by G. oxydans was assessed for its role in REE extraction from GGBFS. With 5% (w/v) GGBFS using a mixture of a non-adapted and a GGBFS-adapted culture, a maximum solubilization of 67% and 88% Nd was observed after 12 and 40 days of incubation, respectively. The total amount of gluconic acid excreted by the bacteria increased with leaching duration, which contributed to a rise in metal extraction. Scanning electron microscope-energy dispersive analysis (SEM-EDAX) analysis of the solid residue showed bacterial cells in corrosion pits, and thereby assisting in metal solubilization.

Item Type:Article
Official URL/DOI:https://10.3390/min12060701
Uncontrolled Keywords:Gluconobacter oxydans; Blast furnace slag; Bioleaching; Rare-Earth-Elements
Divisions:Material Science and Technology
ID Code:9098
Deposited By:Dr Mita Tarafder
Deposited On:13 Jul 2022 16:27
Last Modified:13 Jul 2022 16:27
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