A novel macromolecular depressant for reverse flotation: Synthesis and depressing mechanism in the separation of hematite and quartz

Zhang, Xingrong; Zhu, Yimin; Xie, Yu; Shang, Yanbo; Zheng, Guibing

doi:10.1016/j.seppur.2017.05.051

Cited by 49 publications

(5 citation statements)

References 35 publications

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“…In Fig. 7(a), the isoelectric point (IEP) value of natural quartz was detected to be approximately at pH value of 2.3, which matches well with the results in the literature [45][46][47]. After conditioning with 5 × 10 −4 mol/L DTAB, the zeta potentials of quartz significantly shifted to the positive direction in the entire pH range, and the offset of the IEP transferred to 6.0, which indicated that DTAB had a strong interaction with quartz.…”

Section: Zeta Potential Analysissupporting

confidence: 89%

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 Analysissupporting

confidence: 89%

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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“…The pulp was continuously stirred for 2 min using a pH regulator (HCl or NaOH), and the collector (DDA) was added and agitated for another 3 min. Then, the pH of the suspension was recorded before flotation, and the flotation process [17,18] was conducted for 4 min. The concentrates were weighed after filtering and drying, and the mineral recovery was calculated.…”

Section: Micro-flotation Testsmentioning

confidence: 99%

Developing Effective Separation of Feldspar and Quartz While Recycling Tailwater by HF Pretreatment

et al. 2018

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The effect of hydrofluoric acid (HF) pretreatment on flotation of feldspar and quartz using dodecylamine (DDA) as collector was investigated by micro-flotation, zeta potential, pyrene fluorescence spectroscopy, attenuated total reflection flourier transformed infrared spectroscopy (ATR-FTIR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and bench scale flotation. The micro-flotation tests revealed that there was little difference in the flotation of feldspar and quartz at pH 2, using H 2 SO 4 as pH regulator. After HF pretreatment, the floatability of feldspar significantly increased while the floatability of quartz showed no change. HF pretreatment resulted in leaching of SiO 2 and enrichment of Na, K and Al on the feldspar surface. Consequently, the negative surface charge of feldspar increased at pH 2, which allowed for the flotation separation of the feasible minerals. This took place via an increased electrostatic adsorption between DDA and Na, K, Al on the feldspar surface, which effectively increased its hydrophobicity and as a result, improved the floatability of feldspar. An alternative process which exhibited effective separation of quartz and feldspar while recycling the tailwater from the flotation was proposed.

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“…For a precalcined sample, the spectrum could be well identified to the ferric oxyhydroxide compound which presented a very broad absorption band centred at 3,170 cm -1 and detected a peak at 1,609 cm -1 . These two bands could be assigned to the stretching and bending mode of the hydroxyl group and/or the water molecule 25,[35][36][37] , respectively. In the case of the calcined samples, the strong absorption peaks at 435 and 520 cm -1 were observed due to the Fe-O bond vibrational mode 25,26,35,36 .…”

Section: Uv-vis and Ft-ir Spectroscopy Resultsmentioning

confidence: 99%

Activated carbon-doped with iron oxide nanoparticles (a-Fe2O3 NPs) preparation: particle size, shape, and impurity

Upasen¹

2018

IJCTR

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Inspired by the development of an adsorbent material with a high capacity for chlorinated gas treatment, an -Fe 2 O 3 nanoparticle deposited activated carbon adsorbent was successfully synthesized. The -Fe 2 O 3 NPs synthesis was done by a facile chemical precipitation method using sodium hydroxide (NaOH) as a precipitant agent. The variation of the molar ratio of the reactant and precipitant (i.e. 1:1, 1:1.5, 1:2 by mole) and of the precipitating temperature (i.e. 50, 70, 90C) were explored. The physical and chemical characteristics of the synthesized samples were examined using various techniques; Transmission Electron Microscope (TEM), Brunauer-Emmett-Teller analysis (BET), Thermogravimetry analysis (TGA), Fourier Transform Infra-Red (FT-IR) and Ultraviolet-Visible spectrophotometer. The result shows that two synthesized conditions-1:1 by mole (FeCl 3 :NaOH) at 70C and 1:1.5 by mole (FeCl 3 :NaOH) at 90C-were allowed to produce the smallest size of -Fe 2 O 3 NPs approximately 10 nm. Consequently, it gave the highest specific surface area of 110 m 2 /g. With a higher FeCl 3 : NaOH molar ratio and a higher precipitating temperature, the synthesized Fe 2 O 3 NPs formed a more oval shape with a finer surface. Due to the insufficient purification, unfortunately, an impurity caused by sodium salt was detected in the amount of 5-10 wt.%. The minimum amount of 75 wt.% -Fe 2 O 3 NPs coated on the activated carbon was observed. The production yield of the synthesized -Fe 2 O 3 and -Fe 2 O 3 /GAC samples was also reported.

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A novel macromolecular depressant for reverse flotation: Synthesis and depressing mechanism in the separation of hematite and quartz

Cited by 49 publications

References 35 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

Developing Effective Separation of Feldspar and Quartz While Recycling Tailwater by HF Pretreatment

Activated carbon-doped with iron oxide nanoparticles (a-Fe2O3 NPs) preparation: particle size, shape, and impurity

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