Rare Earth Extraction from Phosphogypsum by Aspergillus niger Culture Broth
Molecules, ISSN: 1420-3049, Vol: 29, Issue: 6
2024
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Most Recent News
Study Results from Guizhou Institute of Technology in the Area of Aspergillus niger Published (Rare Earth Extraction from Phosphogypsum by Aspergillus niger Culture Broth)
2024 APR 03 (NewsRx) -- By a News Reporter-Staff News Editor at Health & Medicine Daily -- Current study results on Aspergillus niger have been
Article Description
The extraction of rare earth elements (REEs) from phosphogypsum (PG) is of great significance for the effective utilization of rare earth resources and enhancing the resource value of PG waste residues. This study used Aspergillus niger (A. niger) fungal culture filtrate as a leaching agent to investigate the behavior of extracting REEs from PG through direct and indirect contact methods. According to the ICP-MS results, direct leaching at a temperature of 30 °C, shaking speed of 150 rpm, and a solid–liquid ratio of 2:1, achieved an extraction rate of 74% for REEs, with the main elements being yttrium (Y), lanthanum (La), cerium (Ce), and neodymium (Nd). Under the same conditions, the extraction rate of REEs from phosphogypsum using an A. niger culture filtrate was 63.3% higher than that using the simulated organic acid-mixed solution prepared with the main organic acid components in the A. niger leachate. Moreover, the morphological changes observed in A. niger before and after leaching further suggest the direct involvement of A. niger’s metabolic process in the extraction of REEs. When compared to using organic acids, A. niger culture filtrate exhibits higher leaching efficiency for extracting REEs from PG. Additionally, using A. niger culture filtrate is a more environmentally friendly method with the potential for industrial-scale applications than using inorganic acids for the leaching of REEs from PG.
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