Effects of solution pH and polyethylene oxide concentrations on molybdenite–molybdenite, molybdenite–kaolinite, and molybdenite–quartz interaction forces: AFM colloidal probe study

Wang, Yingwei; Cao, Yijun; Hu, Shaozheng; Wang, Junchao; Guo, Fayang; Li, Shulei

doi:10.1016/j.seppur.2021.119926

Cited by 17 publications

(2 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Kaolinite ( 001) and (001 ̅ )surfaces were modeled using 2×2×1 supercells. In the molecular simulation process, dimethyl ether molecules, the monomer of PEO, were used to assess the interaction of PEO with the two kaolinite surfaces (Wang et al, 2022). To obtain the most stable adsorption configurations for PEO, the PEO monomer was first spread flat at four different initial sites on symmetric circular structure seen from top view, as shown in Fig.…”

Section: Density Functional Theory Calculationsmentioning

confidence: 99%

Adsorption behavior of poly(ethylene oxide) on kaolinite: Experimental and molecular simulation study

Wang,

Zhang

et al. 2024

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

Poly(ethylene oxide) (PEO) adsorption behavior on kaolinite surfaces in an aqueous solution was investigated through experiments, the density functional theory (DFT), and molecular dynamics (MD) simulations. The experimental results showed that as the PEO concentration increased, the adsorption capacity first increased then slightly decreased and the turbidity change was opposite. The adsorption isotherm on the kaolinite surface was more suitable for the Langmuir model and valid for single-layer adsorption. The results of simulations showed that the PEO chains extended along the two basal surfaces of kaolinite or were partly adsorbed, forming loops and tails that caused most of the particles to flocculate, contributing to the turbidity lowering. When the number of PEO chains was excessive, their self- and inter-aggregation occured with some PEO far from the surface, and the turbidity increased. On the kaolinite (001) surface, the hydrogen bonds between the PEO ether O and the hydroxyl groups constituted the main interaction mechanism. However, the hydrophobic force of the (CH2–CH2)–moiety of PEO might have dominated its adsorption on the (001 ̅) surface. The hydrogen bonds were stronger than the hydrophobic interactions.

show abstract

Section: Density Functional Theory Calculationsmentioning

confidence: 99%

Adsorption behavior of poly(ethylene oxide) on kaolinite: Experimental and molecular simulation study

Wang,

Zhang

et al. 2024

Physicochem. Probl. Miner. Process.

View full text Add to dashboard Cite

show abstract

“…The changes on the quartz surface also indicated that the CPAO adsorbed on the quartz surface particles in some form. Based on the analysis results of contact angle detection, it could be inferred that one end of the CPAO adsorbed on the quartz surface particles in some form, and the hydrophobic end was exposed to the outside, thus improving the hydrophobic surface of the quartz surface [32][33][34]. It can also be seen from Figure 8c,d) that the absolute altitude of the magnesite surface changes little before and after the CPAO treatment, indicating that the CPAO hardly adsorbs on the magnesite surface.…”

Section: Afm Analysismentioning

confidence: 99%

Study on Selective Adsorption Behavior and Mechanism of Quartz and Magnesite with a New Biodegradable Collector

Liu,

Zhao,

Zhang

et al. 2023

Separations

View full text Add to dashboard Cite

Research on the efficient flotation desilication of low-grade magnesite is of great significance for the sustainable development of magnesium resources. Traditional collectors usually have some disadvantages, such as poor selectivity, severe environmental pollution, and weak water solubility. To strengthen the desilication flotation process of magnesite ore, the biodegradable surfactant, cocamidopropyl amine oxide (CPAO), was first utilized as the collector for the separation of the magnesite and quartz. The selective adsorption behavior and mechanism of the quartz and magnesite with the CPAO as the collector were studied through the micro-flotation experiments of the single mineral and the artificially mixed mineral, contact angle and atomic force microscopy (AFM) measurements, fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses. The flotation results indicated that the CPAO showed good selectivity and could effectively separate magnesite and quartz. When the concentration of the CPAO was 10.0 mg/L in the natural pulp pH (about 7.2), the concentrates with 97.67% MgO recovery and 45.62% MgO grade were obtained. The contact angle and AFM measurements indicated that the CPAO could selectively adsorb on the quartz surface rather than the magnesite surface to improve the interface difference between them, especially its surface hydrophobicity. The results of the FTIR and XPS analyses indicated that the CPAO is selectively adsorbed on the surface of the quartz, mainly through electrostatic interaction and hydrogen bonding. In conclusion, the CPAO had good selectivity and great potential as an effective collector in the reverse flotation desilication progress of magnesite.

show abstract

Elimination of the adverse effects of humic substances on molybdenite flotation: Pre-removal of humic substances using polyferric sulfate coagulation

Liu²,

Chang³

et al. 2023

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

Effects of solution pH and polyethylene oxide concentrations on molybdenite–molybdenite, molybdenite–kaolinite, and molybdenite–quartz interaction forces: AFM colloidal probe study

Cited by 17 publications

References 51 publications

Adsorption behavior of poly(ethylene oxide) on kaolinite: Experimental and molecular simulation study

Adsorption behavior of poly(ethylene oxide) on kaolinite: Experimental and molecular simulation study

Study on Selective Adsorption Behavior and Mechanism of Quartz and Magnesite with a New Biodegradable Collector

Elimination of the adverse effects of humic substances on molybdenite flotation: Pre-removal of humic substances using polyferric sulfate coagulation

Contact Info

Product

Resources

About