Journal
MINERALS ENGINEERING
Volume 160, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2020.106681
Keywords
Bond valence model; Collector design; Hemimorphite flotation; Synergistic effect; Adsorption mechanism
Funding
- Fundamental Research Funds for the Central Universities [180106004]
- open fund of Guangdong Provincial Key Laboratory of Development and Comprehensive Utilization of Mineral Resources [20178030314046]
- Liaoning Revitalization Talents Program [XLYC1807089]
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The study explores a flotation collector design method based on the bond valence model and density functional theory, showing that LAA and LSA have better flotation abilities towards hemimorphite, while DGL and LSA can chemisorb onto the hemimorphite surface.
Based on the bond valence model and density functional theory (DFT), the correlation between the bonding strengths of groups and complex stability constants is established and adopted to design flotation collectors. Lauric acid (LA), N-laurylaminoacetic acid (LAA), N-Dodecanoylglycine (DGL), and N-Lauroylsarcosine (LSA) were used to verify the feasibility of design approach. Micro-flotation tests show that LAA and LSA exhibit better flotation ability than LA and DGL toward hemimorphite. However, the quartz can be collected by LAA due to the highly reactive imine groups, which means it can adsorb on the mineral surface through physical adsorption rather than the chemisorption. Fourier transform IR spectroscopy (FTIR) analysis shows that DGL and LSA can adsorb on hemimorphite surface through chemisorption. X-ray photoelectron spectroscopy (XPS) analysis reveals that the reaction is generated between carboxyl and amide groups and Zn site on the hemimorphite surface, forming seven-membered structure as the DFT simulation shown.
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