Insights into the influence of temperature on the adsorption behavior of sodium oleate and its response to flotation of quartz

Cao, Shun‐an; Yin, Wanzhong; Yang, Bin; Zhu, Zhanglei; Sun, Haoran; Sheng, Qiuyue; Chen, Keqiang

doi:10.1016/j.ijmst.2021.12.006

Cited by 62 publications

(21 citation statements)

References 50 publications

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“…19 According to the available literature discussing NaOL adsorption on mineral surfaces, an additional peak should appear around 280 nm. 31 This peak was achieved in the present study at higher concentrations (>8 mM NaOL), corresponding to 276 nm wavelength, but became distinct only at very high concentrations of NaOL (>15 mM), largely outside the usual concentrations used in adsorption studies for flotation purposes. At very high concentrations, aggregates were observed, due to molecular self-assembly, as reported in the literature, 44 and the UV spectra diffused (Figure S1).…”

Section: Ultraviolet Spectra Of Reagentsmentioning

confidence: 44%

Effect of (De-)protonation on the UV Spectra of Sodium Oleate: Experimental and Electronic Structure Investigation

Murhula

Arellano

Cook

et al. 2023

ACS Appl. Opt. Mater.

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Sodium oleate (NaOL), an anionic surfactant used in mineral processing, is challenging to quantify in aqueous solutions using UV spectroscopy. This study examined ultraviolet spectral shifts of sodium oleate with and without common pH regulators. Experimental results were supported by quantum chemical calculations at the CAM-B3LYP//6–31++G(d,p) level of theory. Two main absorbance peaks appeared in sequence, at 190 and 232 nm, corresponding to the π → π* and the n → π* electronic transitions of the CC double bond and COO– functional group, respectively. Under the typical concentration range used in adsorption and flotation studies, the first peak redshifted to reach λmax = 203 nm at 2 mM NaOL, while both solution deprotonation and protonation resulted in hypo/hyperchromicity. By influencing the electronic environment, acidic and alkaline treatments triggered a broadening and narrowing of the NaOL UV spectra. This difference in behavior was associated with the dissociative equilibrium of oleic acid, where protonation was favorable to molecular species, whereas deprotonation favored the ionic oleate species. The HOMO-LUMO excitation energies were higher in the protonated than in the deprotonated environment, explaining the broader spectra obtained experimentally in the former and higher reactivity in the latter. The peak disruptions give rise to significant discrepancies during quantitative measurements of NaOL in aqueous solutions, which may be managed by appropriate precautions and corrective techniques. These findings can be extended to systems similar to the oleate system and may guide experimental and data-processing procedures in UV spectrometry.

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Section: Ultraviolet Spectra Of Reagentsmentioning

confidence: 44%

Effect of (De-)protonation on the UV Spectra of Sodium Oleate: Experimental and Electronic Structure Investigation

Murhula

Arellano

Cook

et al. 2023

ACS Appl. Opt. Mater.

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“…The floatability of dolomite under this condition was 27.9%, which was 34.1% lower than that of fluorapatite. The results indicate that NaOL cannot successfully collect fluorapatite under low temperature in terms of the low floatability, it is because the dispersion and activity of NaOL in solution were affected by temperature [27]. In comparison with NaOL, the floatability of fluorapatite was always above 85% across the concentration tested when SDBS was applied.…”

Section: Effect Of Collector Concentrationmentioning

confidence: 92%

Flotation Separation of Dolomite from Fluorapatite Using Sodium Dodecyl Benzene Sulfonate as the Efficient Collector under Low Temperature

et al. 2022

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Flotation is the most often employed process to achieve the selective removal of contaminants from the raw materials used in the manufacturing of phosphate fertilizer. However, sodium oleate (NaOL), as a typical collector, is ineffective because of its low collecting ability under low temperature. As a result, developing and implementing feasible alternatives is critical for the long-term output of mines. In this study, sodium dodecyl benzene sulfonate (SDBS), a low-cost and freely soluble reagent under low temperature was used to examine its collecting ability and selectivity in a fluorapatite-dolomite system by means of single and artificially mixed minerals flotation. The adsorption mechanism was evaluated with the help of XPS analyses. The flotation results demonstrate that SDBS could float both fluorapatite and dolomite, but show a higher affinity towards fluorapatite instead of dolomite. Moreover, SDBS could preferred adsorb onto fluorapatite surface when fluorapatite and dolomite coexist. SDBS is more suitable than NaOL for satisfactory recovery of fluorapatite under low temperature in terms of the higher recovery obtained. The XPS analyses results demonstrate that the adsorption of SDBS on fluorapatite surface was more intensively as opposed to that on dolomite surface and Ca active sites on fluorapatite surface are supposed to be the main location for SDBS attachment.

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“…X-Ray Photoelectron Spectroscopy and X-Ray Fluorescence Spectroscopy. In the X-ray Photoelectron Spectroscopy (XPS) test, ESCALAB Xi+ XPS developed by Thermoscientific Company (as shown in Figure 1) was used for qualitative and quantitative analysis of gypsum rock [41][42][43]. The X-ray gun uses an Al target with relatively high intensity.…”

Section: Methodsmentioning

confidence: 99%

Study on Expansion Characteristics and Expansion Potential of Gypsum Rock

Zhu

et al. 2022

Geofluids

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In this study, the relationship between four expansion indices and the expansion potential of gypsum rock was studied; on this basis, a criterion for judging expansion potential is established for gypsum rock. The results show that the free expansion rate is unsuitable for grading gypsum rocks’ expansion potential. Setting the gypsum rock in the Wuzhishan tunnel as the research subject, the ultimate expansion rate is 24.28% on the 7th day and 34.08% on the 30th day; the ultimate expansion rate on the 7th day of the indoor rock sample can be estimated by the fitting formula on the 30th day, the ultimate expansion force is 304.51 kPa, and the BET-specific surface area is 6.31 m2/g. The ultimate expansion ratio and BET-specific surface area have an excellent linear relationship with the ultimate expansion force. Setting the ultimate expansion force, ultimate expansion ratio and BET-specific surface area as the standard, the criterion for judging the expansion potential of gypsum rock is determined, which is more convenient and accurate than existing standards. The standard in this paper can predict the potential disasters that may occur in underground engineering.

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Insights into the influence of temperature on the adsorption behavior of sodium oleate and its response to flotation of quartz

Cited by 62 publications

References 50 publications

Effect of (De-)protonation on the UV Spectra of Sodium Oleate: Experimental and Electronic Structure Investigation

Effect of (De-)protonation on the UV Spectra of Sodium Oleate: Experimental and Electronic Structure Investigation

Flotation Separation of Dolomite from Fluorapatite Using Sodium Dodecyl Benzene Sulfonate as the Efficient Collector under Low Temperature

Study on Expansion Characteristics and Expansion Potential of Gypsum Rock

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