Lawrence Livermore Natl Lab;
Phys & Life Sci Directorate;
OLI Syst Inc;
Univ Calif Davis;
Rutgers State Univ;
Mat Sci & Engn;
Suite 301;
Cedar Knolls;
607 Taylor Rd;
ID 83415 USA;
Biosci & Biotechnol Div;
Idaho Falls;
Davis;
Piscataway;
CA 95616 USA;
CA 94550 USA;
NJ 08854 USA;
Livermore;
Idaho Natl Lab;
Peter A Rock Thermochem Lab;
Biol & Chem Proc Dept;
240 Cedar Knolls Rd;
NJ 07927 USA;
关键词：
Bioleaching;
Rare earth recovery;
Biohydrometallurgy;
Mineral acid leaching;
期刊名称：
The Journal of Chemical Thermodynamics
i s s n：
0021-9614
年卷期：
2019 年
132 卷
页 码：
491-496
页 码：
摘 要：
Leaching of six individual rare earth (yttrium, cerium, neodymium, samarium, europium, and ytterbium) doped synthetic phosphogypsum samples using a suite of lixiviants was conducted. The lixiviants chosen for this study were phosphoric acid, sulfuric acid, gluconic acid, and a "biolixiviant" consisting of spent medium containing organic acids from the growth of the bacterium Gluconobacter oxydans on glucose. The biolixiviant had a pH of 2.1 and the dominant organic acid was determined to be gluconic acid, present at a concentration of 220 mM. The leaching behaviors of the studied lixiviants were compared and rationalized by thermodynamic simulations. The results suggest that at equivalent molar concentrations of 220 mM the biolixiviant was more efficient at rare earth element (REE) extraction than gluconic acid and phosphoric acid but less efficient than sulfuric acid. Unlike the organic acids, at pH 2.1 the mineral acids failed to extract REE, likely due to different complexation and kinetic effects. (C) 2019 Elsevier Ltd.
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