Anisotropic surface energies and adsorption behaviors of scheelite crystal

Hu, Yuehua; Gao, Zhiyong; Sun, Wei; Liu, Xiaowen

doi:10.1016/j.colsurfa.2012.09.038

Cited by 152 publications

(64 citation statements)

References 62 publications

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“…A lower value infers a more stable surface which can be used to represent the accurate surface structure [32].The surface energy (E surf ) in a slab model can be calculated by Equation (1) [33].…”

Section: Models For Siderite Surfacementioning

confidence: 99%

Density Functional Theory and Atomic Force Microscopy Study of Oleate Functioned on Siderite Surface

Zhang

Yuan

et al. 2018

Minerals

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Abstract:Efficiently discovering the interaction of the collector oleate and siderite is of great significance for understanding the inherent function of siderite weakening hematite reverse flotation. For this purpose, investigation of the adsorption behavior of oleate on siderite surface was performed by density functional theory (DFT) calculations associating with atomic force microscopy (AFM) imaging. The siderite crystal geometry was computationally optimized via convergence tests. Calculated results of the interaction energy and the Mulliken population verified that the collector oleate adsorbed on siderite surface and the covalent bond was established as a result of electrons transferring from O1 atoms (in oleate molecule) to Fe1 atoms (in siderite lattice). Therefore, valence-electrons' configurations of Fe1 and O1 changed into 3d 6.51 4s 0.37 and 2s 1.83 2p 4.73 from 3d 6.21 4s 0.31 and 2s 1.83 p 4.88 correspondingly. Siderite surfaces with or without oleate functioned were examined with the aid of AFM imaging in PeakForce Tapping mode, and the functioned siderite surface was found to be covered by vesicular membrane matters with the average roughness of 16.4 t nm assuring the oleate adsorption. These results contributed to comprehending the interaction of oleate and siderite.

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Section: Models For Siderite Surfacementioning

confidence: 99%

Density Functional Theory and Atomic Force Microscopy Study of Oleate Functioned on Siderite Surface

Zhang

Yuan

et al. 2018

Minerals

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“…Therefore, various experimental conditions have been investigated to promote vaterite synthesis. In particular, it was reported that a flower-like vaterite could be synthesized when ammonia was present in the carbonate solution [22]. This may explain the formation of vaterite from the NH 4 Cl extraction solution since NH 3 is generated under this condition (Equation (5)).…”

Section: Response Characteristic Of Carbonationmentioning

confidence: 92%

Investigation of the CO<sub>2</sub> Sequestration by Indirect Aqueous Carbonation of Waste Cement

Mun¹,

Cho²,

Kwon³

et al. 2017

AJCC

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Mineral carbonation of CO 2 with fine-grained waste cement was investigated using NH 4 Cl as a recyclable extracting agent. The amount of calcium extracted with NH 4 Cl was not as high as with more commonly used extraction agents such as HCl and CH 3 COOH. NH 4 Cl also exhibited high selectivity in the calcium extraction process, such that calcium ions comprised over 99% of the leaching solution. Another positive benefit of using NH 4 Cl was that precipitation of calcium carbonate by CO 2 injection was possible without the addition of basic reagents. Moreover, the NH 4 Cl regenerated during carbonation can be reused for calcium extraction. However, test results using regenerated NH 4 Cl solution in a cyclic fashion revealed that the process was not perfectly cyclic, but rather the calcium amount after precipitation increased as the cycle proceeded. The geochemical computer simulation PHREEQC was utilized to gain better insight into the cyclic mineral carbonation processes using NH 4 Cl solution. The simulation was based on thermodynamic equilibrium so that the amount of Ca in the solution fluctuated between specific values in a periodic fashion, unlike the experimental results of calcium accumulation in the extraction solution. One reason for this phenomenon was the kinetic/thermodynamic balance controlled by the amount of Ca 2+ and CO 2 present in the solution. However, it was feasible to use a geochemical model to evaluate the mineral carbonation process with the correction factors since the deviation between the experimental and the simulation results remained fairly constant throughout the cycle.

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“…For the adsorption of the oleate on smithsonite, the driving force is mainly the surface reaction between the head group of the oleate and the zinc sites of the smithsonite. Hence, the orientation of the oleate on smithsonite would be in such a way that the oleate polar groups face smithsonite and the hydrocarbon chains face water, thus increasing hydrophobicity of smithsonite as oleate concentration increases and thereby as smithsonite recovery increases [30,31].…”

Section: Flotation Behaviormentioning

confidence: 99%

The Effect of Polystyrene on the Carrier Flotation of Fine Smithsonite

Zhang

Sun

et al. 2017

Minerals

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Abstract:Carrier flotation is a common technique used to improve flotation recovery of ultrafine ores. In this study, we used coarse polystyrene as the carrier material to enhance flotation recovery of fine smithsonite (ZnCO 3 ) particles. Sodium oleate was used as the collector and played a role in the adhesion of fine smithsonite to polystyrene due to its amphipathic properties. The carrier feature of polystyrene was demonstrated using particle size analysis, total organic carbon, and scanning electron microscopy. The fine smithsonite particles coated the polystyrene particles through a reaction between the active zinc sites and the carboxyl head groups of the oleate adsorbed on smithsonite and through a hydrophobic interaction between polystyrene and the hydrocarbon chains of the oleate. Newly enlarged particle aggregates with smithsonite shells enhanced collision and attachment of the hydrophobized aggregates with bubbles, which accelerated smithsonite flotation recovery.

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Anisotropic surface energies and adsorption behaviors of scheelite crystal

Cited by 152 publications

References 62 publications

Density Functional Theory and Atomic Force Microscopy Study of Oleate Functioned on Siderite Surface

Density Functional Theory and Atomic Force Microscopy Study of Oleate Functioned on Siderite Surface

Investigation of the CO<sub>2</sub> Sequestration by Indirect Aqueous Carbonation of Waste Cement

The Effect of Polystyrene on the Carrier Flotation of Fine Smithsonite

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Anisotropic surface energies and adsorption behaviors of scheelite crystal

Cited by 152 publications

References 62 publications

Density Functional Theory and Atomic Force Microscopy Study of Oleate Functioned on Siderite Surface

Density Functional Theory and Atomic Force Microscopy Study of Oleate Functioned on Siderite Surface

Investigation of the CO&lt;sub&gt;2&lt;/sub&gt; Sequestration by Indirect Aqueous Carbonation of Waste Cement

The Effect of Polystyrene on the Carrier Flotation of Fine Smithsonite

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Investigation of the CO<sub>2</sub> Sequestration by Indirect Aqueous Carbonation of Waste Cement