Investigation of dodecylammonium adsorption on mica, albite and quartz surfaces by QM/MM simulation

Liu, Zhen; Sun, Ze; Yu, Jianguo

doi:10.1080/00268976.2015.1029551

Cited by 14 publications

(3 citation statements)

References 27 publications

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“…It is known from the molecular formula C 18 H 35 NH 2 (9-octadecene amine) (curve (a)) that 3344.55 cm −1 is the N−H stretching vibration peak of −NH 2 and that 2924.28 cm −1 and 2854.17 cm −1 are the asymmetric stretching absorption peak and symmetric stretching vibration absorption peak of −CH 2 −, respectively. 1644.28 cm −1 is the C− −C stretching vibration peak, 1398.59 cm −1 is the bending vibration absorption peak of −CH 3 , and 1072.92 cm −1 is the stretching vibration peak of C−N [16]. On curve (b), 3434.10 cm −1 is the asymmetric stretching vibration peak of the hy- droxyl group adsorbed on the quartz surface and the asymmetric stretching vibration peak of Si−O at 1082.80 cm −1 , 778.63 cm −1 and 688.10 cm −1 is the symmetric stretching vibration peak of Si−O−Si, and 461.22 cm −1 is the bending vibration absorption peak of Si−O [17].…”

Section: Effect Of Collector Dosage On Quartz Recoverymentioning

confidence: 99%

Behavior and mechanism of enamine on quartz flotation

Jing¹,

He²,

Wu³

et al. 2020

ScienceAsia

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The mechanism of enamine on a quartz surface was investigated by pure mineral flotation tests combined with quartz surface wettability measurements, zeta potential tests and other analytical methods. The results show that the enamine flotation system had a quartz flotation pH range of 6.0-8.0 and a suitable collector concentration of 50 mg/L. Under neutral conditions, when the collector concentration was low, the enamine was adsorbed on the quartz surface through a weak electrostatic force. Semi-micelle adsorption occurred when the collector concentration reached the critical micelle concentration value of 10 mg/L. At enamine concentrations higher than 50 mg/L, multilayer adsorption of enamine and quartz occurred. The infrared spectroscopy results showed that no new peaks were formed before and after the interaction between quartz and enamine and that the enamine was mainly physically adsorbed on the quartz surface.

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Section: Effect Of Collector Dosage On Quartz Recoverymentioning

confidence: 99%

Behavior and mechanism of enamine on quartz flotation

Jing¹,

He²,

Wu³

et al. 2020

ScienceAsia

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“…In this type of rock, feldspar is often associated with epidote, quartz, and others. There have been many studies on the flotation separation of feldspar and quartz [4][5][6][7][8], but there are few on the separation of feldspar and epidote. "Although there are studies on the purification of feldspar and epidote minerals by chemical and physical separation methods such as leaching, shaking table, magnetic separation and calcination [9][10][11][12]; the flotation method, which is a physicochemical separation method, stands out as a more economical technique".…”

Section: Introductionmentioning

confidence: 99%

Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH

et al. 2022

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The most common beneficiation method for feldspar is flotation with a cationic (amine) collector under acidic conditions. However, there are several disadvantages to this, such as environmental pollution and equipment corrosion. In order to resolve such problems, it is important to study the flotation of feldspar using anionic collectors under natural pH conditions. The purpose of this paper is to study the effects and mechanism of Fe3+ on flotation separation of feldspar and epidote using sodium oleate (NaOL) at a natural pH. Through flotation experiments, adsorption measurements, zeta potential testing, FTIR analysis and X-ray photoelectron spectroscopy (XPS), the mechanism of Fe3+ on the surface of feldspar and epidote is revealed, and the reason behind the difference in flotation of the two minerals is discussed. The flotation test results show that Fe3+ can significantly improve the flotation behavior of minerals when NaOL is used as a collector under natural pH, and the highest recovery rates of feldspar and epidote are 90% and 43%, respectively. Analysis of the solution and adsorption measurement results show that Fe3+ is adsorbed on the minerals′ surface in the form of Fe(OH)3, which promotes the adsorption of NaOL on the minerals’ surface through Fe(OH)3, activating the flotation of feldspar and epidote. The difference in adsorption of Fe3+ between feldspar and epidote is the reason for this difference in flotation behavior. The results of the zeta potentials show that after being treated with Fe3+, the electrostatic adsorption of NaOL displays a significant negative shift on the surface of feldspar, while there is almost no electrostatic adsorption of NaOL on the surface of Fe3+-treated epidote. FTIR analysis confirmed that the difference in the adsorption of Fe3+ and NaOL on the surface of feldspar and epidote is due to the fact that there are more active particles (metal bonds) on the surface of feldspar than on the surface of epidote, and the properties of these metal bonds can be changed by Fe3+, which allows NaOL to be more easily adsorbed on the mineral surface through –COO−. The possible adsorption form is “mineral-Fe3+–COO−“. Compared with the infrared spectrum of epidote, there is a new absorption peak at 1713.68 cm−1, which can be attributed to the C=O characteristic peak of NaOL in the infrared spectrum of Fe3+–NaOL-treated feldspar, which is why the floatability of feldspar is better than epidote. XPS confirmed that the Fe on the surface of feldspar is Fe3+ in the form of Fe(OH)3, while Fe on the surface of epidote is mainly Fe2O3 (Fe–O) contained in mineral crystals. Furthermore, there is less adsorption of Fe3+ on the surface of epidote, and this discrepancy leads to the difference in the adsorption of NaOL on the minerals’ surface, which itself leads to the difference in flotation behavior between feldspar and epidote. These findings indicate that the flotation separation of feldspar and epidote can be achieved using Fe3+ and NaOL under natural pH. This study may provide a reference for the flotation mechanism of feldspar and epidote under natural pH.

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“…Alkyl amine along with their derivatives, due to their low cost, high efficiency, strong foaming properties and high temperature resistance (Liu, et al 2015b), has been broadly applied as cationic collectors in the reverse flotation of quartz from different types of minerals, such as phosphate and iron oxides (Sis and Chander 2003;Wang and Ren 2005;Zawala, et al 2017). The head groups of alkyl amines can be physically adsorbed on the mineral surface, while their non-polar hydrocarbons form a hydrophobic monolayer on surface of the particle, resulting particles hydrophobic (Kou, et al 2010), and bubbles are indispensable in the flotation process as a result of they act as the carrier of hydrophobic minerals to the foam (Wang, et al 2016;Wang and Tao 2017;Xing, et al 2017) and then rise to the top of the containing vessel to form a froth that flows over the lip of the vessel (Ata and Jameson 2005).…”

Section: Introductionmentioning

confidence: 99%

Study on the foam behavior of amine reagents adsorbed at gas-liquid and gas-liquid-solid interfaces

He¹,

shang²,

Xie³

et al. 2020

Physicochem. Probl. Miner. Process.

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Alkyl amines are widely used as cationic collectors in flotation. In this work, the flotation foaming behaviors of alkyl amines, including dodecylamine (DDA), din -hexylamine (DHA), octadecylamine (ODA), oleylamine (OLA), in the presence or absence of quartz were investigated by a new approach, "foam analyzer". The effects of pH, reagent dosage, concentration of quartz powder, and particle size on foaming property and stability of bubble were explored, and the physical model of foam structure evolution was established. The adsorption mechanism of amines on quartz surface was studied from molecular structure, surface tension, zeta potential, charging mode, and adsorption form. The results show the foam stability of four amine collectors as follows: OLA > ODA > DHA > DDA. In the range of pH=6-10, the foam properties of the four amines are better. Under the same conditions, the longer carbon chain of aliphatic amine, the more unsaturated bonds, the fewer hydrogen atoms of the amine group, and the corresponding foam properties are better. When the concentration of quartz powder is 8-10%, the foaming and stability of the foam of four kinds amines are the best, The finer quartz powder particle size, the more stable the amine foam and the stronger the foamability.

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Investigation of dodecylammonium adsorption on mica, albite and quartz surfaces by QM/MM simulation

Cited by 14 publications

References 27 publications

Behavior and mechanism of enamine on quartz flotation

Behavior and mechanism of enamine on quartz flotation

Effects and Mechanism of Fe3+ on Flotation Separation of Feldspar and Epidote with Sodium Oleate at Natural pH

Study on the foam behavior of amine reagents adsorbed at gas-liquid and gas-liquid-solid interfaces

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