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Surface chemistry considerations of gangue dissolved species in the bastnaesite flotation system

Fundamental Research 2022年第5期2卷 748-756页

作者： Longhua Xu Zhoujie Wang Kaiqian Shu Houqin Wu Yuehua Hu Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of Education Southwest University of Science and TechnologyMianyang 621010SichuanChina State Key Laboratory for Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010SichuanChina School of Resources Processing and Bioengineering Central South UniversityChangsha 410012HunanChina

Inefficient flotation of bastnaesite remains a challenge in the production of rare earth *** study aimed to investigate the dissolution and adsorption behaviour of species that are commonly released into bastnaesite flotation pulp from Ca/Ba-bearing gangue *** influence and corresponding mechanisms on the bastnaesite mineral surface and collectors,namely sodium oleate(NaOL),were evaluated experimentally based on micro-flotation,zeta potentials,in situ attenuated total reflection Fourier transform infrared spectroscopy(ATRFTIR),and X-Ray photoelectron spectroscopy(XPS)*** flotation recovery of bastnaesite significantly decreased from ~95% to ~25%,~15%,~80%,~25% when exposed to calcite,fluorite,barite,and mixed dissolved species,*** zeta potential of bastnaesite was pH sensitive,indicating that H^(+) and OH^(−)determine the surface potential of *** chemistry analyses revealed that the presence of the dissolved species differed at various pH *** situ ATR-FTIR demonstrated the different effects of the dissolved species from calcite,fluorite,and barite on collector *** former two dissolved species mainly depressed the chemisorption of the NaOL monomers(RCOO^(-)),whereas calcite also affected the physical adsorption of the oleic acid molecular dimer(RCOOH·RCOO^(-)).Moreover,the barite dissolved species only affected the physical adsorption of the NaOL *** results of XPS analysis revealed that dissolved species from these three gangues could pre-adsorbed onto bastnaesite and affected the interaction with the *** functional theory calculations were employed to provide further theoretical insights into the interactions between the dissolved species from calcite,fluorite,and barite and NaOL.

关键词： Bastnaesite dissolved species Flotation Adsorption Calcite

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Adsorption of octanohydroxamic acid at fluorite surface in presence of calcite species

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Transactions of Nonferrous Metals Society of China 2021年第12期31卷 3891-3904页

作者： Zhou-jie WANG Long-hua XU Hou-qin WU Huan ZHOU Jin-ping MENG Xiao-mei HUO Ling-yun HUANG Key Laboratory of Solid Waste Treatment and Resource Recycle Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China State Key Laboratory for Environment-friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China

The surface properties of fluorite are often affected by dissolved gangue species(e.g.,calcite)during the flotation *** testing with and without the addition of calcite supernatant was conducted using octanohydroxamic acid(OHA)as the *** results revealed that dissolved calcite species significantly affected the flotation behavior of *** transform infrared spectra confirmed that the decrease in flotation recovery was linked to lower OHA *** chemistry analysis indicated that CaCO_(3) and Ca^(2+)from the calcite supernatant were the most favorably adsorbed species,and X-ray photoelectron spectroscopy analysis confirmed the surface adsorption of calcite *** functional theory simulations provided a detailed analysis of the multidentate adsorption configuration of OHA,which was the most favorable for adsorption on the fluorite *** adsorption energy calculation showed that the calcite dissolved species were more stably adsorbed on the fluorite surface than *** pre-adsorption of calcite dissolved species hindered the adsorption of OHA due to electrostatic repulsion.

关键词： fluorite calcite flotation dissolved species DFT calculation

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