Role of decaethoxylated stearylamine in the selective flotation of hornblende and siderite: An experimental and molecular dynamics simulation study

Yang, Bin; Yin, Wanzhong; Yao, Jin; Sheng, Qiuyue; Zhu, Zhanglei

doi:10.1016/j.apsusc.2021.151177

Cited by 54 publications

(6 citation statements)

References 78 publications

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“…Generally, any variation in the charge on the surface of a mineral is referred to as the adsorption behavior of flotation reagents. This variation could elucidate the interaction between reagents and mineral surfaces during the flotation process [40][41][42][43][44]. Therefore, the zeta potentials of quartz and fluorapatite were detected in the absence and presence of the 5 × 10 −4 mol/L collector with varying pH values, and the results are shown in Fig.…”

Section: Zeta Potential Analysismentioning

confidence: 99%

Utilization of DTAB as a collector for the reverse flotation separation of quartz from fluorapatite

Liu

Huang

Rao

et al. 2021

Int J Miner Metall Mater

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Reverse flotation desilication is an indispensable step for obtaining high-grade fluorapatite. In this work, dodecyltrimethylammonium bromide (DTAB) is recommended as an efficient collector for the reverse flotation separation of quartz from fluorapatite. Its collectivity for quartz and selectivity for fluorapatite were also compared with figures corresponding to the conventional collector dodecylamine hydrochloride (DAC) via microflotation experiments. The adsorption behaviors of DTAB and DAC on minerals were systematically investigated with surface chemical analyses, such as contact angle determination, zeta potential detection, and adsorption density measurement. The results revealed that compared to DAC, DTAB displayed a similar and strong collectivity for quartz, and it showed a better selectivity (or worse collectivity) for fluorapatite, resulting in a high-efficiency separation of the two minerals. The surface chemical analysis results showed that the adsorption ability of DTAB on the quartz surface was as strong as that of DAC, whereas the adsorption amount of DTAB on the fluorapatite surface was much lower than that of DAC, which is associated with the flotation performance. During the floatation separation of the actual ore, 8wt% fluorapatite with a higher grade can be obtained using DTAB in contrast to DAC. Therefore, DTAB is a promising collector for the high-efficiency purification and sustainable utilization of valuable fluorapatite recourses.

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Section: Zeta Potential Analysismentioning

confidence: 99%

Utilization of DTAB as a collector for the reverse flotation separation of quartz from fluorapatite

Liu

Huang

Rao

et al. 2021

Int J Miner Metall Mater

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“…Currently, the selective separation methods used in case of magnesite and carbonate gangue minerals include direct flotation with anionic collectors (Wang et al, 2016) and reverse flotation with cationic collectors such as amines . Alternative biotechnology methods for magnesite decalcification with microorganisms were also considered (Yanmis et al, 2015). Sodium oleate is a commonly used anionic collector with strong collection capacity with poor selectivity for many minerals, including magnesite .…”

Section: Introductionmentioning

confidence: 99%

Separation of magnesite and calcite based on flotation solution chemistry

Gong¹,

yao²

2022

Physicochem. Probl. Miner. Process.

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The dissolution characteristics of minerals, dissolution of flotation agents in solutions, and equilibrium of dissociations and associations serve as the basis for determining the optimal conditions for the effective components of flotation agents and for evaluating the interaction between flotation agents and minerals. This basis provided the theoretical support for the flotation separation of minerals. Based on this, the flotation separation of magnesite and calcite was realized using sodium dihydrogen phosphate, also known as monosodium phosphate (MSP), as a regulator and dodecylamine (DDA) as a collector. When MSP was used in the DDA system, single-mineral and binary mixed-ore flotation tests revealed that the floatability of calcite was significantly greater than that of magnesite and the separation of magnesite and calcite was more effective, respectively. Zeta potential measurements showed that MSP-containing negative groups could selectively reduce the zeta potential of calcite and promote the adsorption of DDA-containing positive groups on the surface of the calcite. However, this effect was negligible on the zeta potential of magnesite. Due to the stronger affinity of MSP to Ca 2+ than that to Mg 2+ , as demonstrated by Fourier transform infrared and X-ray photoelectron spectroscopy analyses, the MSP was adsorbed onto the surface of calcite primarily by hydrogen bonds rather than magnesite, which promoted the stronger adsorption of DDA-containing positive groups on the surface of the calcite. As a result, the differences in the floatability of magnesite and calcite were enlarged by MSP. Thus, MSP can be utilized an effective regulator for the efficient separation of magnesite from calcite via reverse flotation.

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“…Liao et al investigated the spreading behaviors of dodecane, oleic acid, and a dodecane–oleic acid mixture on low-rank coal surfaces, through contact angle relaxation tests and molecular kinetic (MK) model fitting. Yang et al implemented mineral surface analysis and molecular dynamics, establishing a model to separate hornblende from siderite with decaethoxylated stearylamine as the collector. Zhang et al and Chang et al investigated the morphology of the adsorption molecules of a collector on a mineral surface with the utilization of molecular simulations; their inherent mechanisms for improving flotation efficiency are explored as well.…”

Section: Introductionmentioning

confidence: 99%

Molecular Resolution Imaging of Adsorption of Dodecane on a Lignite Surface by Frequency Modulation AFM

Wang

2022

Energy Fuels

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The consumption of dodecane, a critical flotation collector, in the flotation of low-rank coal is particularly high; however, the adsorption mechanism of dodecane on coal still remains unclear. To shed light on this issue, the molecular-scale adsorption structure of dodecane on a lignite surface was investigated in situ by frequency modulation atomic force microscopy (FM-AFM) for the first time. The adsorption structure of dodecane on highly oriented pyrolytic graphite (HOPG) and mica has been detected in advance. Meanwhile, molecular dynamics (MD) simulations are utilized to elucidate and illustrate the adsorption structure on HOPG, mica, and lignite. Experimental results from FM-AFM show that a layered structure of dodecane molecules is formed on HOPG, while there is no stable adsorption structure on mica. Meanwhile, a few local monolayer structures of dodecane molecules are observed on the surface of lignite, and their thickness is approximately 1 nm, which is less than the molecular chain length of dodecane. It is speculated that the dodecane molecules are adsorbed on lignite selectively, with the capacity to form a stable adsorption structure. As indicated by MD simulations, the interaction energy between dodecane and the mentioned surfaces is in the order HOPG > lignite > mica. And the MD simulation results show a desirable match with direct observation by FM-AFM. In accordance with the characterization of the lignite sample surface, large amounts of polar oxygen-containing functional groups may hinder dodecane adsorption behavior. Through in situ molecular resolution imaging of the interface structure between dodecane and a raw lignite surface, we provide a new perspective for exploring the interaction mechanism between nonpolar collectors and a lignite surface.

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Role of decaethoxylated stearylamine in the selective flotation of hornblende and siderite: An experimental and molecular dynamics simulation study

Cited by 54 publications

References 78 publications

Utilization of DTAB as a collector for the reverse flotation separation of quartz from fluorapatite

Utilization of DTAB as a collector for the reverse flotation separation of quartz from fluorapatite

Separation of magnesite and calcite based on flotation solution chemistry

Molecular Resolution Imaging of Adsorption of Dodecane on a Lignite Surface by Frequency Modulation AFM

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