Selective flotation separation of galena from sphalerite via chelation collectors with different nitrogen functional groups

Wang, Jinggang; Ji, Yuehan; Cheng, Shao-Yi; Shu, Liu; Cao, Jian; Chen, Pan

doi:10.1016/j.apsusc.2021.150956

Cited by 10 publications

(4 citation statements)

References 61 publications

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“…The larger the contact angle, that is, the angle between solid–liquid and gas–liquid interface, the worse is the wettability and better is the hydrophobicity of the mineral surface . According to the figure, the contact angle of scheelite treated without the collector was 41.7°, which basically corresponds with the outcomes of the previous literature . The results showed that when the concentration of the collector increased from 0 to 1 × 10 –7 mol/L at pH = 7, the contact angle of the scheelite surface increased, and the effect of AATS on the scheelite contact angle was more significant.…”

Section: Resultssupporting

confidence: 83%

“…51 According to the figure, the contact angle of scheelite treated without the collector was 41.7°, which basically corresponds with the outcomes of the previous literature. 52 The results showed that when the concentration of the collector increased from 0 to 1 × 10 −7 mol/L at pH = 7, the contact angle of the scheelite surface increased, and the effect of AATS on the scheelite contact angle was more significant. After treatment with 1 × 10 −7 mol/L AATS, the water−gas−scheelite interface contact angle reached 95.8°.…”

Section: ■ Materials and Methodsmentioning

confidence: 95%

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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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Section: Resultssupporting

confidence: 83%

Section: ■ Materials and Methodsmentioning

confidence: 95%

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

et al. 2022

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“…The results indicated that collectors with multiple N atoms exhibit better selectivity for galena, and the functional group containing S atom plays a dominant role when the solution pH < pKa value of the collector. However, they did not establish a clear structure‐performance relationship for the collectors [15].…”

Section: Introductionmentioning

confidence: 99%

DFT study on the effects of substituents on the structure and properties of dithiophosphate collectors

Ding,

Liu,

Chen

et al. 2024

Int J of Quantum Chemistry

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The structures and properties of seven substituted dithiophosphate (DTP) collectors containing three types of functional groups (O2PS2, C2PS2, and N2PS2) were studied using density functional theory. The collectors studied were dibutyl dithiophosphate (DNBDTP), diisobutyl dithiophosphate (DIBDTP), dibutoxyethyl dithiophosphate (DBOEDTP), xylenol dithiophosphate (DMPDTP), diisobutyl dithiohypophosphite (3418A), diphenylamine dithiophosphate (DTADTP), and dicyclohexylamine dithiophosphate (DCADTP). The structural analysis showed that the PS bond lengths in the C2PS2 and N2PS2 types are longer than those in the O2PS2 type, indicating that the strength of the PS bond is weaker in the former two. The frontier molecular orbital studies showed that the energy differences between the highest occupied molecular orbitals (HOMO) of 3418A (C2PS2 type) and DCADTP (N2PS2 type) and the lowest unoccupied molecular orbital (LUMO) of galena are significantly lower than those of the other collectors, suggesting that C2PS2 type and N2PS2 type with cyclohexane could enhance the interaction with galena. Using the Fukui function to calculate the nucleophilicity and electrophilicity of the sulfur atom indicated that the S atom exhibits nucleophilicity, especially in DMPDTP and DTADTP, which contain benzene rings, and the S atom exhibits strong nucleophilicity without electrophilicity. However, due to the lack of contribution from S atoms to the LUMO orbitals, the S atoms in these two compounds are not participate in any LUMO reactions. The adsorption results demonstrated that 3418A (C2PS2 type) and DCADTP (N2PS2 type) exhibit the strongest adsorption on Pb2+ ions, while DMPDTP (C2PS2 type) and DTADTP (O2PS2 type) which contain benzene rings, as well as DBOEDTP (C2PS2 type) which does not contain a benzene ring, exhibit weaker interaction compared to the other compounds. These are consistent with the results of the frontier molecular orbital and electrophilic nucleophilicity calculations.

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“…In addition, sodium diethyl dithiocarbamate (SN-9 # ) has been used industrially for galena flotation under strongly alkaline conditions. Wang et al found that nitrogen functional groups in the structure of collector could improve the selectivity of collector owing to the chelating reaction of N atoms with surface Pb atoms [9].…”

Section: Introductionmentioning

confidence: 99%

Dual Role of Fe²⁺ in the Galena Flotation and Influence on Selective Separation

Yang,

Wang,

Xie

et al. 2023

Adsorption Science & Technology

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Fe ions, as one of the unavoidable metal ions, are present in flotation pulp as ferric and ferrous species, and the effect of ferric species on the flotation behavior of sulfide minerals has been widely discussed in the above literatures. However, the effect of ferrous species has rarely been noticed. In this paper, the effect of ferrous species on the flotation behavior and surface characteristics of galena was investigated by using microflotation, zeta potential measurements, X-ray photoelectron spectrometer (XPS) analysis, and density functional theory (DFT) calculations. Microflotation tests indicated that the flotation recovery of galena with potassium butyl xanthate (KBX) as collector was significantly decreased with the addition of Fe2+ in the pulp, and the recovery was further decreased with increasing dosage of Fe2+. In addition, the finer the galena particles, the greater the decrease in flotation recovery. Zeta potential analysis illustrated that the isoelectric point (IEP) was shifted from 4.4 to 5.8 due to the adsorption of ferrous hydroxyl complexes on the galena surface and the zeta potential. XPS surface analysis suggested that the surface oxidation of galena was alleviated by the consumption of O2 in the pulp, which reduced the adsorption of the collector KBX on and the oxidation of xanthates to dixanthogens. Density functional theory (DFT) calculations confirmed that the ferrous hydroxyl complex FeOH+ could be adsorbed on the galena surface by interactions between Fe and S atoms.

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Selective flotation separation of galena from sphalerite via chelation collectors with different nitrogen functional groups

Cited by 10 publications

References 61 publications

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

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

DFT study on the effects of substituents on the structure and properties of dithiophosphate collectors

Dual Role of Fe²⁺ in the Galena Flotation and Influence on Selective Separation

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Selective flotation separation of galena from sphalerite via chelation collectors with different nitrogen functional groups

Cited by 10 publications

References 61 publications

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

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

DFT study on the effects of substituents on the structure and properties of dithiophosphate collectors

Dual Role of Fe2+ in the Galena Flotation and Influence on Selective Separation

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Dual Role of Fe²⁺ in the Galena Flotation and Influence on Selective Separation