Synthesis of a novel collector based on selective nitrogen coordination for improved separation of galena and sphalerite against pyrite

Zhang, Wanjia; Feng, Zhitao; Mulenga, Happy; Sun, Wei; Cao, Jian; Gao, Zhiyong

doi:10.1016/j.ces.2020.115860

Cited by 39 publications

(8 citation statements)

References 61 publications

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“…The peaks at 1608.6 cm −1 and 1394.5 cm −1 correspond to the carbonyl stretching vibration of the carboxyl (-COO-) group [42,43]. Another characteristic peak of SDAA appears at 1631.7 cm −1 , which is attributed to an amide group (-CON-) stretching vibration [25,44].…”

Section: Ftir Analysis Resultsmentioning

confidence: 99%

“…According to the literature, the fluorite surface is positively charged at pH 6.0-9.0, while the scheelite surface is always negatively charged [46]. Moreover, the interaction of the amide group which forms a Ca-Amide complex by monodentate coordination is significantly stronger with fluorite than with scheelite [10,25]. At pH 7.0, the chelating sites of SDAA were negatively charged.…”

Section: Discussionmentioning

confidence: 96%

“…Instead, the mineral suspension was continuously magnetically stirred for 30 min. Then, the samples were washed with deionized water three times, vacuum dried in an oven at 40 • C, and subjected to FTIR analysis [25].…”

Section: Ftir Measurementsmentioning

confidence: 99%

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Selective Separation of Fluorite from Scheelite Using N-Decanoylsarcosine Sodium as a Novel Collector

et al. 2022

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Fluorite and scheelite, which are strategic calcium-bearing minerals, have similar active sites (Ca2+); as a result, the efficient separation of the two minerals is still one of the world’s most difficult problems in the field of flotation. In this work, N-decanoylsarcosine sodium (SDAA), a non-toxic and low-cost amino acid surfactant, was applied in the flotation separation of fluorite from scheelite for the first time. In the test, single mineral, binary mixed minerals, and actual ore experiments showed that the pre-removal of fluorite from scheelite by reverse flotation can be achieved. The results of adsorption capacity detections, zeta potential tests, and FTIR analysis showed that the negatively charged SDAA prefers to adsorb onto the positively charged fluorite surface due to the electrostatic interaction. The results of crystal chemistry and DFT calculations showed that SDAA has a stronger chemical interaction and more electron transfer numbers to the Ca atom on the fluorite surface and forms a Ca-SDAA complex. Therefore, the significant difference in the adsorption behavior of SDAA on the surfaces of two minerals provided a new insight into the separation efficiency of amino acids and possesses a great potential for industrial application in scheelite flotation.

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Section: Ftir Analysis Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 96%

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Selective Separation of Fluorite from Scheelite Using N-Decanoylsarcosine Sodium as a Novel Collector

et al. 2022

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“…To further understand the role of the amide groups in the flotation process of BTAHA, we calculated the electrostatic potential (ESP) of BTAHA 53 . The ESP and the location of the extreme points are shown in Figure 8B.…”

Section: Discussionmentioning

confidence: 99%

Amide group enhanced self‐assembly and adsorption of thioether‐containing hydroxamic acid on cassiterite surface

et al. 2023

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Modified surfactants can regulate their adsorption at the target surface and are essential for various separation applications such as froth flotation. Thioether‐containing hydroxamic acid (BTHA) is an excellent oxidized‐ore collector with poor dispersibility. Herein, acylamino, which possesses the ability to improve the surfactants' self‐assembly and dispersion, was introduced to synthesize N‐[6‐(hydroxyamino)‐6‐oxohexyl] benzylthioacetamide (BTAHA); thus, applying it to cassiterite flotation. Surface tension, adsorption capacity, in situ AFM, and surface energy results reveal BTAHA displays strong bubble stability and readily adsorbs onto the mineral's surface, promoting hydrophobic flotation. BTAHA is an effective cassiterite collector and has good separation effects on cassiterite against calcite. It can form Van der Waals forces and five‐membered hydroxamate‐(O,O)‐Sn rings with Sn atoms on cassiterite surfaces via thioether and hydroxamate groups. Meanwhile, the presence of intermolecular hydrogen bond between the amide groups facilitates the self‐assembly of the collectors on the cassiterite surface, and has broad industrial application prospects in various separation processes.

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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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Synthesis of a novel collector based on selective nitrogen coordination for improved separation of galena and sphalerite against pyrite

Cited by 39 publications

References 61 publications

Selective Separation of Fluorite from Scheelite Using N-Decanoylsarcosine Sodium as a Novel Collector

Selective Separation of Fluorite from Scheelite Using N-Decanoylsarcosine Sodium as a Novel Collector

Amide group enhanced self‐assembly and adsorption of thioether‐containing hydroxamic acid on cassiterite surface

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

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