New Insights into the Depressive Mechanism of Sodium Silicate on Bastnaesite, Parisite, and Fluorite: Experimental and DFT Study
Abstract
:1. Introduction
2. Experiment
2.1. Materials and Reagents
2.2. Microflotation Experiments
2.3. Zeta Potential Measurements
2.4. Contact Angle Tests
2.5. XPS Measurements
2.6. First-Principles Calculations
3. Results and Discussion
3.1. Microflotation Results
3.2. Zeta Potential Results
3.3. Contact Angle Measurements
3.4. XPS Analysis
3.5. DFT Simulation
4. Conclusions
- OHA demonstrates a stronger collecting ability for bastnaesite compared to parisite, with the weakest collecting ability for fluorite. Conversely, SS exhibited the strongest depressing ability for fluorite, followed by parisite, and the weakest for bastnaesite.
- SS has the strongest adsorption on fluorite, significantly hindering the adsorption of OHA. SS and OHA compete for adsorption on parisite surfaces. SS has weak adsorption on the surface of bastnaesite and has little effect on the adsorption of OHA.
- OHA ions form covalent bonds with metal ions on the surfaces of the three minerals. The five-membered hydroxamic-(O-O)-Ce/Ca chelate coordination formed between OHA and metal atoms on the three mineral surfaces is the most stable. Compared with parisite and fluorite, OHA exhibits a greater affinity for bastnaesite. SS interacts with metal ions on the mineral surface primarily through the SiO(OH)3− component, and SiO(OH)3− has the strongest affinity for fluorite, followed by parisite and bastnaesite.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Mineral Surface | Active Site | OHA Adsorption Energy (kJ mol−1) | SS Adsorption Energy (kJ mol−1) |
---|---|---|---|
Bastnaesite (100) surface | Ce | −767.68 | −624.77 |
Parisite (100) surface | Ce | −674.59 | −678.53 |
Ca | −507.19 | −480.79 | |
Fluorite (100) surface | Ca | −250.25 | −678.58 |
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Wang, J.; Lu, W.; Cao, Z.; Wu, X.; Wang, P.; Wang, X.; Liu, W. New Insights into the Depressive Mechanism of Sodium Silicate on Bastnaesite, Parisite, and Fluorite: Experimental and DFT Study. Minerals 2024, 14, 870. https://doi.org/10.3390/min14090870
Wang J, Lu W, Cao Z, Wu X, Wang P, Wang X, Liu W. New Insights into the Depressive Mechanism of Sodium Silicate on Bastnaesite, Parisite, and Fluorite: Experimental and DFT Study. Minerals. 2024; 14(9):870. https://doi.org/10.3390/min14090870
Chicago/Turabian StyleWang, Jieliang, Wenda Lu, Zhao Cao, Xu Wu, Peng Wang, Xiaoping Wang, and Wenli Liu. 2024. "New Insights into the Depressive Mechanism of Sodium Silicate on Bastnaesite, Parisite, and Fluorite: Experimental and DFT Study" Minerals 14, no. 9: 870. https://doi.org/10.3390/min14090870