Iron ore production using a new Gemini surfactant at 273 K

Huang, Zhiqiang; Li, Wenyuan; Shuai, Shuyi; Zhang, Shiyong; Wang, Hongling; Liu, Rukuan; Cheng, Chen; Yu, Xinyang; He, Guichun; Fu, Weng

doi:10.1039/d2cc02705d

Cited by 4 publications

(3 citation statements)

References 52 publications

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“…Recently, collectors with multiple polar groups have emerged as a promising avenue for next-generation flotation agents. − Huang et al have conducted a series of work on Gemini collectors, characterized by two polar groups, and made full use of the advantages of lower critical micelle concentration and higher surface activity resulting from intermolecular interactions to realize the flotation enrichment of Chlorella, magnetite, and potassium salts. − Guo’s research demonstrates that amide lauric acid can enhance flotation recovery through intermolecular synergism via hydrogen bond interaction between amide groups …”

Section: Introductionmentioning

confidence: 99%

A Novel Bipolar Surfactant, BETX, for Selective Flotation of Chalcopyrite: Folding-Synergistic Mechanism Based on Intramolecular Weak Interactions

Lin,

Yang,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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Surfactants with multiple polar groups have shown promising applications, while the molecular mechanism that distinguishes them from conventional surfactants remains unclear. Herein, a novel surfactant, BETX, which contains two polar groups was designed, and the effect of intramolecular interaction on its molecular mechanism was elucidated. MD simulations, DFT calculations, and UV spectroscopy revealed that the BETX molecules fold due to π−π stacking and various other weak interactions, which enhances the binding ability of BETX to Cu 2+ while reducing that to Fe 3+ . Interestingly, the synergism of ionic xanthate groups and nonionic thionocarbamate groups enables the thionocarbamate groups to react with Cu 2+ in aqueous solutions. This selective synergistic behavior endowed BETX with excellent selective flotation ability for chalcopyrite, with a dosage an order of magnitude lower than that of traditional collectors. ToF-SIMS, FTIR, and XPS demonstrated that BETX interacts with chalcopyrite through the xanthate group and the deprotonated thionocarbamate group. Each N and S atom in the molecule can form chemical bonds with copper sites. Comparative assessments of Cu 2+ binding between unfolded bipolar surfactants with rigid structures have confirmed the reinforcing effect of folding synergism in BETX molecules. The revelation of this intramolecular folding-synergistic mechanism holds profound significance, offering crucial insights into the operational mechanisms of multipolar surfactants and facilitating precise molecular design for future advancements.

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Section: Introductionmentioning

confidence: 99%

A Novel Bipolar Surfactant, BETX, for Selective Flotation of Chalcopyrite: Folding-Synergistic Mechanism Based on Intramolecular Weak Interactions

Lin,

Yang,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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“…Foams are widely used in firefighting, daily chemical, mineral flotation, oil extraction, and other fields. − However, it is a thermodynamically unstable system, and the foaming capacity and stability are generally improved by adding surfactants . Surfactants, due to their unique amphiphilic structure, adsorb at the gas–liquid interface to hinder liquid film precipitation and foam agglomeration. , This causes a reduction in the interfacial generation energy and surface tension, which makes it easy for the surfactant solution to form foams under perturbation .…”

Section: Introductionmentioning

confidence: 99%

Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Cao,

Xia,

Zhao

et al. 2023

Ind. Eng. Chem. Res.

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In the application of foams in the industrial field, there are often high requirements for foaming ability and stability, but this brings greater pressure for defoaming. This paper discusses the evolution kinetics of aqueous foams stabilized by the anionic surfactant sodium dodecyl sulfate (SDS) under the influence of MgCl 2 . It is found that MgCl 2 has a dual effect on the performance of SDS foam, which is shown by the enhanced foaming ability and significantly improved stability but rapid defoaming when drained to a certain film thickness. This phenomenon not only increases efficiency in industrial applications but also facilitates recycling and defoaming. To clarify the mechanism behind this interesting phenomenon, we discuss the influence of MgCl 2 on bubbles, adsorption, film strength, disjoining pressure, surface tension, and rheological properties. The results show that the addition of MgCl 2 can significantly reduce the surface tension and interfacial formation energy and increase the adsorption of surfactant, film strength, and bulk phase viscosity. The size of the generated foam becomes smaller and more uniform. These factors together led to the enhancement of the stability of foam with the thicker liquid film. However, the addition of MgCl 2 can also have some detrimental effects on stability. For example, faster adsorption kinetics and higher surface strength lead to a weakening of the membrane repair capacity. Most importantly, when the liquid film is very thin, the surface adsorbed by SDS has a strong specific adsorption for Mg 2+ , which causes interfacial adhesion directly, leading to the instability of the thin liquid film. This paper provides theoretical guidance on the use of magnesium salts as additives, offering new ideas for combining high foam application performance and low defoaming difficulty.

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“…Froth flotation, a method that takes advantage of the surface physical and chemical differences between target minerals and gangue minerals, − is the most widely employed technical means for separating scheelite , currently. However, due to the lack of highly selective collectors, to reach effective separation, large amounts of inhibitors must usually be added to the flotation process or even heated.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Trisiloxane Surfactant for Selective Flotation of Scheelite from Calcite at Room Temperature

et al. 2022

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The separation and enrichment of scheelite from calcite are hindered by the similar active Ca2+ sites of scheelite and the calcite with calciferous gangue. Herein, a novel trisiloxane surfactant, N-(2-aminoethyl)-3-aminopropyltrisiloxane (AATS), was first explored and synthesized and recommended as the collector for the flotation separation of scheelite from calcite. The micro-flotation and mixed binary mineral flotation tests showed that AATS had excellent collection performance for scheelite and high selectivity for calcite within a wide pH range. At the same time, contact angle and zeta-potential measurements, Fourier transform infrared (FTIR) analysis, and density functional theory (DFT) calculations revealed the relevant adsorption mechanism. The contact angle measurement showed that AATS can increase the contact angle of the scheelite surface from 41.7 to 95.8°, greatly enhancing the hydrophobicity of the mineral surface. The results of FTIR analysis and zeta-potential measurement explained that AATS was electrostatically adsorbed on the mineral surface, and DFT calculation further verified that the −N+H3-positive group in AATS was adsorbed on the negatively charged scheelite surface. Therefore, AATS can realize the expectation of high efficiency and selectivity of minerals and enhance the adhesion between the surface of scheelite minerals and bubbles, providing a fresh approach to industrial production.

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Iron ore production using a new Gemini surfactant at 273 K

Abstract: Herein we present a Gemini surfactant can efficiently separate magnetite from quartz by reverse froth flotation to produce iron ore at 273 K. Achieving the obviously superior flotation performance (TFe...

Cited by 4 publications

References 52 publications

A Novel Bipolar Surfactant, BETX, for Selective Flotation of Chalcopyrite: Folding-Synergistic Mechanism Based on Intramolecular Weak Interactions

A Novel Bipolar Surfactant, BETX, for Selective Flotation of Chalcopyrite: Folding-Synergistic Mechanism Based on Intramolecular Weak Interactions

Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Adsorption of Trisiloxane Surfactant for Selective Flotation of Scheelite from Calcite at Room Temperature

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Iron ore production using a new Gemini surfactant at 273 K

Abstract: Herein we present a Gemini surfactant can efficiently separate magnetite from quartz by reverse froth flotation to produce iron ore at 273 K. Achieving the obviously superior flotation performance (TFe...

Cited by 4 publications

References 52 publications

A Novel Bipolar Surfactant, BETX, for Selective Flotation of Chalcopyrite: Folding-Synergistic Mechanism Based on Intramolecular Weak Interactions

A Novel Bipolar Surfactant, BETX, for Selective Flotation of Chalcopyrite: Folding-Synergistic Mechanism Based on Intramolecular Weak Interactions

Study on the Dual Effects of MgCl2 on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate

Adsorption of Trisiloxane Surfactant for Selective Flotation of Scheelite from Calcite at Room Temperature

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Product

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Study on the Dual Effects of MgCl₂ on the Characteristics of Foams Stabilized by Sodium Dodecyl Sulfate