Abstract：
Rare earth element (REE) recovery from waste streams, mine tailings or recyclable components using bioleaching is gaining traction due to the shortage and security of REE supply as well as the environmental problems that occur from processing and refining. Four heterotrophic microbial species with known phosphate solubilizing capabilities were evaluated for their ability to leach REE from a high-grade monazite when provided with either galactose, fructose or maltose. Supplying fructose resulted in the greatest amount of REE leached from the ore due to the largest amount of organic acid produced. Gluconic acid was the dominant organic acid identified produced by the cultures, followed by acetic acid. The monazite proved difficult to leach with the different carbon sources, with preferential release of Ce over La, Nd and Pr.
摘要：
从废物流中回收稀土元素(REE)，由于稀土供应的短缺和安全性以及加工和精炼带来的环境问题，使用生物浸矿的尾矿或可回收成分正在获得吸引力。评估了四种具有已知磷酸盐溶解能力的异养微生物物种在提供半乳糖时从高级独居石中浸出REE的能力，果糖或麦芽糖。由于产生的酸性有机酸的最大量,供应果糖导致从矿石中浸出的REE的最大量。葡糖酸是培养物确定产生的主要有机酸，其次是乙酸。独居石难以用不同的碳源浸出，Ce优先于La回收，Nd和Pr.
