New insights into selective-depression mechanism of novel depressant EDTMPS on magnesite and quartz surfaces: Adsorption mechanism, DFT calculations, and adsorption model

Sun, Haoran; Yang, Bin; Zhu, Zhanglei; Yin, Wanzhong; Sheng, Qiuyue; Hou, Ying; Yao, Jin

doi:10.1016/j.mineng.2020.106660

Cited by 83 publications

(18 citation statements)

References 39 publications

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“…The crystal morphologies of ε-HNIW (CCDC: 117779) under different pressures were simulated by the morphology module, and the first three important crystal faces of (011), (110), and (10-1) were selected to calculate the adsorption energy with P-CO. The adsorption energy was calculated using the CASTEP module in the Materials Studio 2019 software. , First, GGA-PBESOL-D method was employed to optimize the adsorption models, that is, the P-CO models, models of the three important crystal faces of HNIW, and complex models of the P-CO crystal faces. The default settings were used for all other parameters.…”

Section: Methodsmentioning

confidence: 99%

Pressure-Induced In Situ Construction of P-CO/HNIW Explosive Composites with Excellent Laser Initiation and Detonation Performance

Sun

Gou

et al. 2021

ACS Appl. Mater. Interfaces

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Laser initiation is a popular research topic in the energetic community. Particularly, the direct ignition of secondary explosives by laser ignitors is considered to be an advanced strategy for enhancing safety and promoting the miniaturization of weapons. Here, to improve the laser sensitivity of secondary explosives, P-CO synthesized under high pressure was employed as a coating for HNIW owing to its laser sensitivity and excellent energetic properties. In this operation, HNIW underwent an obvious isostructural phase transition from the ε-phase to the γ′-phase in the pressure range of 1.0–4.8 GPa. Subsequently, sub-nanoscale HNIW-based composites were formed when CO in situ polymerized to P-CO on the surfaces of HNIW at 5.1 GPa. This HNIW-based composite could be ignited at a much lower laser power (0.49–0.65 W) compared with pure HNIW (2.75–2.98 W) when excited by an Nd:YAG laser with a wavelength of 1064 nm. Additionally, the DFT calculations demonstrated that the arrangement density between HNIW and P-CO was significantly enhanced as the pressure increased. Thus, the introduction of advanced materials into explosive formulations through high-pressure technology is a novel and feasible strategy for developing multipurpose energetic materials.

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Section: Methodsmentioning

confidence: 99%

Pressure-Induced In Situ Construction of P-CO/HNIW Explosive Composites with Excellent Laser Initiation and Detonation Performance

Sun

Gou

et al. 2021

ACS Appl. Mater. Interfaces

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“…FTIR was tested using a FTIR-650S spectrometer at 298 ± 2 K within 4000-400 cm −1 [23]. The mineral samples were ground to approximately 5 µm.…”

Section: Ftir Spectroscopy Measurementmentioning

confidence: 99%

“…After the flotation agents were adsorbed onto the mineral surfaces, their surface potentials changed, significantly influencing mineral floatability [23,28]. Under conditions similar to those of the flotation tests, contact angle measurements were conducted (Table 3).…”

Section: Contact Angle Testsmentioning

confidence: 99%

“…The FTIR spectra of the reagents and samples are shown in Figures 5 and 6 The kyanite peak at approximately 675 cm −1 corresponded to the Si-O tetrahedron symmetrical bending vibration peak; however, the kyanite peaks at approximately 972 and 933 cm −1 were attributed to the Si-O asymmetric stretching vibration of the tetrahedron peaks [22] (Figure 5). Figure 6 shows that the characteristic peaks of quartz at approximately 778 and 693 cm −1 correspond to Si-O symmetrical bending vibrations and Si-O-Si asymmetrical bending vibrations, respectively [23,31].…”

Section: Ftir Measurementsmentioning

confidence: 99%

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Elimination of Ferric Ion Effect on Separation between Kyanite and Quartz Using Citric Acid as Regulator

Li¹,

Sun

et al. 2021

Minerals

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Ferric ions produced during grinding influence the flotation separation between kyanite and quartz adversely. In this study, citric acid was used as a regulator to eliminate the effect of ferric ions on the separation of kyanite from quartz with sodium oleate (NaOL) as a collector. The microflotation test results indicated that the quartz was selectively activated by FeCl3 and maintained significant quartz recovery. However, the citric acid could selectively eliminate the effect of ferric ions on the quartz and minimally influenced the kyanite. Contact angle tests demonstrated that FeCl3 significantly increased the interaction between NaOL and quartz, resulting in the high hydrophobicity of quartz, and the addition of citric acid made the quartz surface hydrophilic again but slightly influenced the kyanite. Fourier-transform infrared spectroscopy showed that FeCl3 facilitated NaOL adsorption onto the quartz surface, and the addition of citric acid eliminated the activation of FeCl3 on the quartz, resulting in the nonadsorption of NaOL onto the quartz surface. However, the FeCl3 and citric acid exhibited a negligible effect on NaOL adsorption onto the kyanite surface. X-ray photoelectron spectroscopy analysis indicated that the citric acid eliminated FeCl3 activation on the quartz.

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“…Generally, the contact angle of the three-phase (solid-liquid-gas) interface usually mirrors the wettability of the mineral surface and is associated with its flotation performance under a specific reagent system [29][30][31][32][33][34][35]. A small contact angle on the mineral surface indicates that the mineral is strongly hydrophilic and presents low floatability, whereas a larger contact angle on the mineral surface suggests that the mineral is strongly hydrophobic and presents a high floatability [26,36].…”

Section: Wettability 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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New insights into selective-depression mechanism of novel depressant EDTMPS on magnesite and quartz surfaces: Adsorption mechanism, DFT calculations, and adsorption model

Cited by 83 publications

References 39 publications

Pressure-Induced In Situ Construction of P-CO/HNIW Explosive Composites with Excellent Laser Initiation and Detonation Performance

Pressure-Induced In Situ Construction of P-CO/HNIW Explosive Composites with Excellent Laser Initiation and Detonation Performance

Elimination of Ferric Ion Effect on Separation between Kyanite and Quartz Using Citric Acid as Regulator

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

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