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The bio-leaching approaches are environmentally benign and economically viable. We investigated the bacterial Acidothiobacillus ferrooxidans (Af) and the fungal Aspergillus niger (An) for bio-leaching of REEs from a phosphate ore, and examined the factors governing the leaching processes. Based on the shake flask leaching studies, an increase in surface area with the increase in pulp density level (1-15 wt.%) was found to lead to an increase in the amounts of REEs leached.

Environmentally Benign Bio-Leaching Extraction of Rare Earth Elements from Non-Conventional Resources