Adsorption and depression mechanism of an eco-friendly depressant dextrin onto fluorite and calcite for the efficiency flotation separation

Chen, Yuangan; Feng, Bo; Yan, Huashan; Zhang, Liangzhu; Zhong, Chunhui; Wang, Tao; Xu, Longhua

doi:10.1016/j.colsurfa.2021.127987

Cited by 26 publications

(8 citation statements)

References 41 publications

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“…In order to further demonstrate the adsorption of asphaltene on mineral surfaces, the FTIR spectra of dolomite and calcite before and after asphaltene adsorption were obtained and are shown in Figure c,d. The FTIR spectra of dolomite before and after asphaltene adsorption are shown in Figure c, which include (1) peaks at 1425.14 cm –1 assigned to the asymmetric stretching vibration of C–O and (2) peaks at 879.45 and 721.53 cm –1 assigned to the deformation vibration of −CO 3 2– . , The FTIR spectra of calcite before and after asphaltene adsorption are shown in Figure d, which include (1) peaks at 1434.78 cm –1 assigned to the stretching vibration of C–O and (2) peaks at 874.58 and 706.64 cm –1 assigned to the deformation vibration of −CO 3 2– . , After asphaltene adsorption, the absorption peaks of −CH 2 groups emerging at 2923.55 cm –1 were observed on the mineral surfaces.…”

Section: Resultsmentioning

confidence: 99%

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Performance Investigation of Asphaltene Adsorption at a Carbonate Rock Surface: Spectroscopy Experiment and Molecular Simulation

Ma,

Huang,

Wan

et al. 2024

Langmuir

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Investigation of asphaltene adsorption at rock surfaces plays an important role in enhanced oil recovery (EOR) for the petroleum industry. In this work, the interaction performances of asphaltene adsorption at carbonate dolomite and calcite surfaces are investigated based on experimental and simulation insights. On the one hand, macroscopic interaction performances were investigated by spectroscopy experiments to obtain the Langmuir thermodynamic model and pseudo-second-order (PSO) kinetic model. The results indicated monolayer molecular asphaltene adsorption for both dolomite and calcite, while they showed 'slow adsorption−slow desorption' for dolomite but 'fast adsorption−fast desorption' for calcite. Meanwhile, dolomite showed a higher adsorption capacity with q m(dol 1) = 5.35 mg/g > q m(cal 1) = 1.28 mg/g and a stronger adsorption spontaneity with ΔG m(dol 1) θ = −7.76 kJ/mol < ΔG m(cal 1) θ = −4.76 kJ/mol. On the other hand, microscopic interaction performances were investigated for three asphaltene molecules by molecular dynamics simulation (MDS) with ∼8 Å distance-placing and 500 ps time-running. According to the results, dolomite showed higher system stability than calcite with a lower final energy of ΔE dol−cal = −58 kJ/mol, and archipelago asphaltene showed higher adsorption stability with the smallest equilibrium energy of E arch(dol) = −147 kJ/mol for albite and E arch(cal) = −89 kJ/mol for calcite. The model of molecular orientation and force dominance was proposed as the interaction mechanism for asphaltene adsorption, which "lie sideways" at low concentrations but "stands upright" at high concentrations. This work allows the performance investigation and mechanism illustration of asphaltene adsorption at rock surfaces, which can help gain a fundamental understanding of the EOR during reservoir exploitation.

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Section: Resultsmentioning

confidence: 99%

“…. 44,45 After asphaltene adsorption, the absorption peaks of −CH 2 groups emerging at 2923.55 cm −1 were observed on the mineral surfaces.…”

Section: Molecular Dynamics Simulations Analysis Of the Electronic St...mentioning

confidence: 99%

Performance Investigation of Asphaltene Adsorption at a Carbonate Rock Surface: Spectroscopy Experiment and Molecular Simulation

Ma,

Huang,

Wan

et al. 2024

Langmuir

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“…The propos models for the adsorption of PAA on the calcite surface are shown in Figure 9 [70]. Starch and dextrin are a kind of macromolecular organic compound with the a vantages of a comprehensive source, low cost, and strong depression effects on calc [73,99]. The adsorption mechanism indicated that the -OH group of starch/dextrin shown in Figure10 [1], might adsorb on Ca sites at the surface of calcite through chemi bonds.…”

Section: Organic Depressantsmentioning

confidence: 99%

“…The inner electron binding energy of Ca 2+ in fluorite is larger than the inner electr binding energy of Ca 2+ in calcite, which makes it more difficult to form chemical bon Therefore, the chemical adsorption of starch/dextrin on the surface of calcite is strong than that on the surface of fluorite. Starch and dextrin are a kind of macromolecular organic compound with the advantages of a comprehensive source, low cost, and strong depression effects on calcite [73,99]. The adsorption mechanism indicated that the -OH group of starch/dextrin as shown in Figure 10 [1], might adsorb on Ca sites at the surface of calcite through chemical bonds.…”

Section: Organic Depressantsmentioning

confidence: 99%

Difficulties and Recent Achievements in Flotation Separation of Fluorite from Calcite—An Overview

Huang

Zhang

Li³

et al. 2022

Minerals

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As an important strategic non-metallic mineral resource, fluorite has been widely used in various industrial fields, such as metallurgy, optics and semiconductor manufacturing, as well as fluorine-related chemical engineering. Since the major gangue minerals of fluorite ore are silicate and carbonate ones, flotation is the main beneficiation method for the concentration. Compared with the relatively easy operation for silicate-type fluorite ore, fluorite concentration from calcite has always been the most difficult challenge in the field of mineral processing. In this review, analyses of the fundamental reasons for the difficulties of flotation separation of fluorite from calcite are performed, from the similar surface properties of both calcium minerals to the deterioration by the interference of dissolved ions in the pulp during grinding and flotation. Recent achievements in the flotation separation of fluorite from calcite as the main contents are comprehensively summarized, covering all aspects of flotation reagents of collectors, depressants and modifiers. Finally, successful examples of industrial practices forfluorite and calcite flotation separation are introduced. This overview provides a detailed and comprehensive reference source for the current research status of fluorite and calcite flotation separation, and some suggestions for future research are provided.

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“…• химическое направленное воздействие, посредством регулирования процесса за счет добавления селективно действующих реагентов: a) собирателей как реагентов, увеличивающих гидрофобные свойства минералов и уменьшающих смачиваемость минералов водой [14][15][16]; b) депрессоров, увеличивающих гидрофильные свойства и смачиваемость материала [17][18][19]. Существует широкий спектр применяемых реагентов для депрессии минералов пустой породы: органические депрессоры, жидкое стекло, пирофосфат натрия.…”

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Assessment of Surface Properties of Coal and Rock-Forming Minerals Under the Influence of Depressors

Prokhorova,

Smirnov,

Aleksandrova

2024

УСЕ (ACNR)

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Существующие методы обогащения минерального сырья, с учетом ухудшения качества исходного материала, поступающего на обогатительную фабрику, нуждаются в интенсификации. Процесс флотационного обогащения основан на различной смачиваемости минеральных фаз, что приводит к необходимости обеспечения селективного извлечения полезных компонентов и улучшения качества получаемой продукции необходимо понимание действия реагентов на поверхностные свойства. В работе рассматривается селективное действие реагентов-депрессоров с анализом изменения свободной поверхностной энергии и ее составляющих для избирательного подавления минералов пустой породы. Анализ результатов исследования показал, что пирофосфат натрия оказал более селективное действие по отношению к минералам кварца и кальцита, чем на поверхностные свойства угля, с увеличением свободной поверхностной энергии на 37,78 мН/м и 13,19 мН/м, соответственно. Исследование влияния депрессоров на поверхностные свойства минеральных фаз позволяет обосновать возможность повышения качества концентрата путем направленного подавления пустой породы. При проведении флотационных опытов был получен концентрат с зольностью 6,32 % при применении комбинации депрессоров пирофосфата натрия и жидкого стекла; при этом содержание серы составило 0,279 %.

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Adsorption and depression mechanism of an eco-friendly depressant dextrin onto fluorite and calcite for the efficiency flotation separation

Cited by 26 publications

References 41 publications

Performance Investigation of Asphaltene Adsorption at a Carbonate Rock Surface: Spectroscopy Experiment and Molecular Simulation

Performance Investigation of Asphaltene Adsorption at a Carbonate Rock Surface: Spectroscopy Experiment and Molecular Simulation

Difficulties and Recent Achievements in Flotation Separation of Fluorite from Calcite—An Overview

Assessment of Surface Properties of Coal and Rock-Forming Minerals Under the Influence of Depressors

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