Polystyrene nanoparticles as a flotation collector: A molecular dynamics study

Mabudi, A.; Noaparast, Mohammad; Gharabaghi, Mahdi; Vásquez, Victor R.

doi:10.1016/j.molliq.2018.11.062

Cited by 24 publications

(8 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The interaction energies between the collector(s) and minerals were characterized by the E value. A more negative E value indicates stronger adsorption between the reagent and mineral surfaces [25][26][27]. The Material Studio 5.0 package was used to perform the simulations and calculations.…”

Section: Molecular Dynamics Simulationmentioning

confidence: 99%

New Combined Depressant/Collectors System for the Separation of Powellite from Dolomite and the Interaction Mechanism

et al. 2020

View full text Add to dashboard Cite

The flotation beneficiation of powellite from dolomite was achieved with a new reagent system that consists of a mixed collector of sodium oleate (NaOl) and benzohydroxamic acid (BHA) and a depressant sodium hexametaphosphate (SHMP). The interaction mechanism of the reagent regime with minerals was studied using zeta potential and X-ray photoelectron spectroscopy (XPS) detection together with crystal chemistry and interaction energy analysis. The matching features of O–O distance in BHA with that in saline minerals and active site density/activity were used as methods to explain the reagent/mineral interaction. The results of microflotation finally established the new reagent regime at pH 8–12: 2.5 × 10−4 M SHMP, 2 × 10−4 M mixed collector containing 1.5 × 10−4 M NaOl and 0.5 × 10−4 M BHA. SHMP selectively depresses the adsorption of NaOl and BHA onto dolomite but minimally affects the adsorption of NaOl and BHA on the powellite surface.

show abstract

Section: Molecular Dynamics Simulationmentioning

confidence: 99%

New Combined Depressant/Collectors System for the Separation of Powellite from Dolomite and the Interaction Mechanism

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The production of copper from sulfide minerals represents more than 70% of the total copper production in Chile, contributing to increased ore processing by flotation plants [ 1 ]. It is important to note that, although froth flotation has been developed and commercially applied for more than a century, there are still some shortcomings that need to be overcome to achieve maximum mineral recovery, such as low grades of ores and environmental problems [ 2 ]. These shortcomings have become more challenging because the ore grades have consistently decreased, and the environmental awareness has become more relevant in recent years.…”

Section: Introductionmentioning

confidence: 99%

“…More specifically, conventional reagents were classified as hazardous materials because they may affect both the environmental and human health as well as flora and fauna if they are improperly managed and disposed of [ 3 , 4 ]. Xanthates, for example, are the most common type of water-soluble collectors used for sulfide minerals, however, these have raised ever-increasing environmental concerns as carbon disulfide is readily emitted from xanthate, thus creating a need to search for a new and more efficient generation of flotation reagents [ 2 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Use of Polystyrene Nanoparticles as Collectors in the Flotation of Chalcopyrite

et al. 2022

View full text Add to dashboard Cite

This study proposes the use of polymeric nanoparticles (NPs) as collectors for copper sulfide flotation. The experimental phase included the preparation of two types of polystyrene-based NPs: St-CTAB and St-CTAB-VI. These NPs were characterized by Fourier-Transform Infrared (FTIR) spectroscopy and dynamic light scattering (DLS). Then, microflotation tests with chalcopyrite under different pH conditions and nanoparticle dosages were carried out to verify their capabilities as chalcopyrite collectors. In addition, the zeta potential (ZP) measurements of chalcopyrite in the presence and absence of NPs were carried out to study their interaction. Lastly, some Atomic Force Micrographs (AFM) of NPs and Scanning Electronic Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS) analysis of NPs on the chalcopyrite surface were conducted to analyze the size, the morphology and their interaction. The results obtained at pH 6 and pH 8 show that the NPs under study can achieve a chalcopyrite recovery near or higher than that obtained with the conventional collector. In this study, it was possible to observe that the NPs functionalized by the imidazole group (St-CTAB-VI) achieved better performance due to the presence of this group in its composition, allowing to achieve a greater affinity with the surface of the mineral.

show abstract

“…Polystyrene, one of the most widely used polymers, is non-biodegradable and thermally stable when the temperature is below 200 °C . Compared to bulk polystyrene materials, polystyrene nanoparticles have more various applications, such as in biosensors, biomedicine, ,− photonics, nanoparticle size standards, self-assembling various nanostructures, − mineral flotation, gas separation, , and templates for porous materials. − …”

Section: Introductionmentioning

confidence: 99%

Crown Ether-Assisted Synthesis of Polystyrene Nanoparticles: Implications for Biomedicine and Electronics

Chen

Peng

Lin

et al. 2020

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Monodisperse polystyrene (PS) nanoparticles with widely tunable sizes (30–930 nm) were prepared by soap-free emulsion polymerization with the assistance of crown ethers. The effects of crown ether species and concentrations, initiator species, and monomer contents on the sizes of PS nanoparticles were investigated in detail. The presence of 18-crown-6 and 15-crown-5 in the reaction system will facilitate the polymerization rate of styrene and produce larger PS nanoparticles in comparison with the control group (without crown ethers), whereas the system with 12-crown-4 retards the polymerization rate significantly and brings the smallest PS nanoparticles. As the interface of monomer/water is the main locus of initial reaction for the thermally initiated emulsion polymerization, the crown ether/alkali complexes accumulated around the styrene/water phase play both catalyst and molecular fence roles in the styrene soap-free emulsion polymerization. The former promotes and the latter inhibits the growth of PS nanoparticles. The relative contribution of these functions ultimately determines the final particle size. The results indicate that particle nucleation in styrene soap-free emulsion polymerization in the presence/absence of crown ethers occurs via an aggregative nucleation mechanism. This study provides a facile method to synthesize nanoparticles with widely tunable sizes via soap-free emulsion polymerization with the help of crown ethers, which has great potentials in biomedical and electronic fields.

show abstract

Polystyrene nanoparticles as a flotation collector: A molecular dynamics study

Cited by 24 publications

References 51 publications

New Combined Depressant/Collectors System for the Separation of Powellite from Dolomite and the Interaction Mechanism

New Combined Depressant/Collectors System for the Separation of Powellite from Dolomite and the Interaction Mechanism

Use of Polystyrene Nanoparticles as Collectors in the Flotation of Chalcopyrite

Crown Ether-Assisted Synthesis of Polystyrene Nanoparticles: Implications for Biomedicine and Electronics

Contact Info

Product

Resources

About