Interface adsorption of 5-amino-1,3,4-thiadiazole-2-thiol on chalcopyrite surface as flotation depressant in Cu/Mo separation

Zhang, Xingrong; Lu, Lulin; Luo, Anruo; Xiong, Wei; Chen, Jianhua

doi:10.1016/j.apsusc.2022.155703

Cited by 16 publications

(6 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to Leja [5] and Woods [6], generally, the main mechanisms for the increase in hydrophobicity of sulfide minerals in flotation by the addition of collectors include (1) the adsorption of metal xanthate with low solubility and (2) the oxidation of xanthate into dixanthogen on a sulfide mineral surface in an aqueous solution. Previous AFM studies with chalcopyrite and pyrite [16][17][18] have shown that, because under ambient conditions, i.e., room temperature and normal pressure, dialkyl dixanthogen is usually in a liquid form with a low melting point [23], the adsorbed dixanthogen on sulfides in an aqueous solution demonstrates patches with smooth and round edges, which fits well with the fact that oily dixanthogen is generally insoluble in water and that the circular boundary is the direct result of the high interfacial tension between hydrophobic dixanthogen and water. In the present investigation, as shown by Figures 2-17, the adsorbate shows no evidence of smooth and round edges, and the surface morphology of chalcocite after adsorption is similar to what has been obtained with the bornite/xanthate system instead [22].…”

Section: Adsorption Of Xanthate On Chalcocite Surfacementioning

confidence: 99%

“…AFM force measurements [17,21,22] have shown that, compared to insoluble metal xanthate, an oily substance such as dixanthogen adsorbs on the mineral surface resulting in a large adhesion force both in magnitude and range between an AFM tip and the mineral surface, suggesting a strong adhesion between a bubble and a mineral surface, which is beneficial for better flotation. That is, on the mineral surface, an oily adsorbate is better than insoluble precipitates when the surface coverage of adsorbate is the same.…”

Section: Adsorption Of the Mixture Of Xanthate And Dialkyl Dithiophos...mentioning

confidence: 99%

“…It is also of great interest to directly obtain the image of collectors on mineral surfaces changing with pulp chemistry, such as pH and chemical dosage. For example, the AFM imaging technique has been widely used in the surface characterization of various materials, and recently the technique has been successfully applied to study in situ the adsorption of chemicals on the surface of minerals [16][17][18][19][20][21][22]. The novel analysis method has greatly expanded the understanding of the impact of solution chemistry on the collectors' adsorption on the mineral surface and the flotation mechanism as well.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

AFM Image Analysis of the Adsorption of Xanthate and Dialkyl Dithiophosphate on Chalcocite

Zhang

2022

Minerals

View full text Add to dashboard Cite

Atomic force microscopy (AFM) has been applied to study the adsorption morphology of various collectors, i.e., potassium ethyl xanthate (KEX) and potassium amyl xanthate (PAX) and Cytec Aerofloat 238 (sodium dibutyl dithiophosphate), on chalcocite in situ in aqueous solutions. The AFM images show that all these collectors adsorb strongly on chalcocite. Xanthate adsorbs mainly in the form of insoluble cuprous xanthate (CuX), which binds strongly with the mineral surface without being removed by flushing with ethanol alcohol. This xanthate/chalcocite adsorption mechanism is very similar to the one obtained with the xanthate/bornite system; while it is different from the one of the xanthate/chalcopyrite systems, for which oily dixanthogen is the main adsorption product on chalcopyrite surface. On the other hand, dibutyl dithiophosphate adsorbs on chalcocite in the form of hydrophobic patches, which can be removed by rinsing with ethanol alcohol. AFM images show that the adsorption of collectors increases with increasing adsorption time and collectors’ concentration. In addition, increasing the solution pH to 10 does not prevent the adsorption of xanthate and Aerofloat 238 on chalcocite and the result is in line with the fact that chalcocite floats well in a wide pH range up to 12 with xanthate and dialkyl dithiophosphate being used as collectors. The blending collectors study shows that xanthate and dialkyl dithiophosphate can co-adsorb with both insoluble cuprous xanthate and oily Cu(DTP)2 (Cu dibutyl dithiophosphate) on a chalcocite surface. The present study helps to clarify the flotation mechanism of chalcocite in industry practice using xanthate and dialkyl dithiophosphate as collectors.

show abstract

Section: Adsorption Of Xanthate On Chalcocite Surfacementioning

confidence: 99%

Section: Adsorption Of the Mixture Of Xanthate And Dialkyl Dithiophos...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

AFM Image Analysis of the Adsorption of Xanthate and Dialkyl Dithiophosphate on Chalcocite

Zhang

2022

Minerals

View full text Add to dashboard Cite

show abstract

“…1−4 Collectors are a significant type of surfactant that can selectively adsorb to the surface of target minerals, altering their hydrophobic properties and enabling flotation separation. 5 The proper application of collectors is essential for enhancing the efficiency of mineral resource utilization. 6,7 Over the past century, substantial advancements has been witnessed in flotation industry through the adoption of ionic and nonionic collectors typified by xanthates and thionocarbamates, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Owing to the adaptable properties of the headgroup and the hydrophobic tail, in conjunction with the distinctive directional arrangement behavior, surfactants assume a pivotal role in a wide array of domains, including material synthesis, biomedicine, consumer products, and mineral separation. − Collectors are a significant type of surfactant that can selectively adsorb to the surface of target minerals, altering their hydrophobic properties and enabling flotation separation . The proper application of collectors is essential for enhancing the efficiency of mineral resource utilization. , Over the past century, substantial advancements has been witnessed in flotation industry through the adoption of ionic and nonionic collectors typified by xanthates and thionocarbamates, respectively. − Nonetheless, these collectors’ effectiveness in copper–sulfur separation or the collection of various copper-bearing minerals has progressively fallen short of the contemporary demands for copper recovery and the production of clean copper resources. ,,, …”

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.

View full text Add to dashboard Cite

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.

show abstract

Molecule Doping of Atomically Dispersed Cu–Au Alloy for Enhancing Electroreduction of CO to C₂₊ Products

Sun,

Tan,

Jia

et al. 2024

Adv Funct Materials

View full text Add to dashboard Cite

Electrocatalytic carbon monoxide reduction (CORR) is effective in achieving renewable synthesis of valuable C2+ species from CO. However, the production of C2+ species is challenged by low activity and selectivity. Here, the surface of the atomically dispersed Cu–Au alloy is functionalized with aromatic heterocycle, thiadiazole derivate (N2SN), to enhance the conversion of CO into C2+ species with acetate as the main product. The N2SN functional groups with electron withdrawing property can alternate the oxidization state of copper, as confirmed by XPS and XAS, thus orienting the CORR pathway to the formation of C2+/acetate. In situ Raman reveals that the N2SN treated sample exhibits stronger signal of *CO intermediate for further dimerization and the C–C–O intermediate relates to acetate formation. Theoretical calculation demonstrates the N2SN molecule doping contributes to lowered energy barrier for C–C coupling, improved activity and selectivity to CORR, and suppressed hydrogen evolution reaction. High Faradaic efficiency (FEC2+, 89%), partial current density (jC2+, 397 mA cm−2), and energy efficiency for C2+ species (EEC2+, 24%) and total current density (jtotal, up to 1000 mA cm−2) are achieved in membrane electrode assembly (MEA), surpassing most of the reported catalysts for total C2+ products.

show abstract

Interface adsorption of 5-amino-1,3,4-thiadiazole-2-thiol on chalcopyrite surface as flotation depressant in Cu/Mo separation

Cited by 16 publications

References 38 publications

AFM Image Analysis of the Adsorption of Xanthate and Dialkyl Dithiophosphate on Chalcocite

AFM Image Analysis of the Adsorption of Xanthate and Dialkyl Dithiophosphate on Chalcocite

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

Molecule Doping of Atomically Dispersed Cu–Au Alloy for Enhancing Electroreduction of CO to C₂₊ Products

Contact Info

Product

Resources

About

Interface adsorption of 5-amino-1,3,4-thiadiazole-2-thiol on chalcopyrite surface as flotation depressant in Cu/Mo separation

Cited by 16 publications

References 38 publications

AFM Image Analysis of the Adsorption of Xanthate and Dialkyl Dithiophosphate on Chalcocite

AFM Image Analysis of the Adsorption of Xanthate and Dialkyl Dithiophosphate on Chalcocite

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

Molecule Doping of Atomically Dispersed Cu–Au Alloy for Enhancing Electroreduction of CO to C2+ Products

Contact Info

Product

Resources

About

Molecule Doping of Atomically Dispersed Cu–Au Alloy for Enhancing Electroreduction of CO to C₂₊ Products