Study of Microbial Cultures for the Bioleaching of Scandium from Alumina Industry By-Products

Metals

Lamprini-Areti Tsakanika¹  Kyriaki Kiskira¹  Maria Ochsenkühn-Petropoulou¹  Klaus-Michael Ochsenkühn¹  Konstantina Papadopoulou²  Charalampos Pavlopoulos²  Gerasimos Lyberatos²  Theopisti Lymperopoulou³ 

[1] Laboratory of Inorganic and Analytical Chemistry, School of Chemical Engineering, Zografou Campus, National Technical University of Athens, Iroon Polytechniou 9, 15773 Athens, Greece;Laboratory of Organic Chemical Technology, School of Chemical Engineering, Zografou Campus, National Technical University of Athens, Iroon Polytechniou 9, 15773 Athens, Greece;Products and Operations Quality Control Laboratory School of Chemical Engineering, School of Chemical Engineering, Zografou Campus, National Technical University of Athens, Iroon Polytechniou 9, 15773 Athens, Greece;

关键词: bauxite residue;    scandium;    bioleaching;    acetobacter;    industrial by-product;    rare earth elements;   

DOI  :  10.3390/met11060951

来源: DOAJ

【 摘 要 】

The disposal of voluminous, highly alkaline, bauxite residue (BR), the industrial by-product of alumina production by the Bayer process, constitutes an intricate global environmental problem. BR, containing valuable metals such as rare-earth elements (REEs)—in particular, scandium (Sc)—can be used as a secondary source for REE extraction. The scope of this study was the investigation of bioleaching as an innovative and environmentally friendly approach for the extraction of Sc from BR. The bioleaching parameters were studied on Greek BR and experiments were performed using different microbial cultures and solid to liquid ratios (S/L). The maximum extraction of Sc was 42% using Acetobacter tropicalis in a one-step bioleaching process at 1% S/L. The main organic acids produced were acetic, oxalic, and citric. The bioleaching data indicated a probable synergistic effect of the different organic acids produced by microorganisms along with a more targeted leaching mechanism.

【 授权许可】

Unknown