2022-06-02 オークリッジ国立研究所(ORNL)
研究チームは、理論と分光法を組み合わせて、鉱石混合物からバストネサイトを浮き上がらせ、泡沫浮選法による回収を促進するコレクター分子を設計した。この研究は、効率的な分離のために作られた将来の捕集剤をモデリングするために必要な情報を提供するものである。
＜関連情報＞
- https://www.ornl.gov/news/materials-tailor-made-molecules
- https://pubs.acs.org/doi/full/10.1021/acs.langmuir.1c03422
分子認識の知見によるレアアース鉱物の分離の向上。機能化ヒドロキサム酸のバストネサイトおよびカルサイトへの吸着反応 Improving Rare-Earth Mineral Separation with Insights from Molecular Recognition: Functionalized Hydroxamic Acid Adsorption onto Bastnäsite and Calcite
Robert C. Chapleski Jr., Azhad U. Chowdhury, Anna K. Wanhala, Luke D. Gibson, Dia̅na Stamberga, Santa Jansone-Popova, Robert L. Sacci, Harry M. Meyer III, Andrew G. Stack, Vera Bocharova*, Benjamin Doughty*, and Vyacheslav S. Bryantsev
LANGMUIR Published:April 20, 2022
DOI:https://doi.org/10.1021/acs.langmuir.1c03422
Abstract
Enhancing the separation of rare-earth elements (REEs) from gangue materials in mined ores requires an understanding of the fundamental interactions driving the adsorption of collector ligands onto mineral interfaces. In this work, we examine five functionalized hydroxamic acid ligands as potential collectors for the REE-containing bastnäsite mineral in froth flotation using density functional theory calculations and a suite of surface-sensitive analytical spectroscopies. These include vibrational sum frequency generation, attenuated total reflectance Fourier transform infrared, Raman, and X-ray photoelectron spectroscopies. Differences in the chemical makeup of these ligands on well-defined bastnäsite and calcite surfaces allow for a systematic relationship connecting the structure to adsorption activity to be framed in the context of interfacial molecular recognition. We show how the intramolecular hydrogen bonding of adsorbed ligands requires the inclusion of explicit water solvent molecules to correctly map energetic and structural trends measured by experiments. We anticipate that the results and insights from this work will motivate and inform the design of improved flotation collectors for REE ores.
