Structures of Pb-BHA Complexes Adsorbed on Scheelite Surface

Wei, Zhao; Sun, Wenjuan; Hu, Yuehua; Han, Haisheng; Sun, Wei; Wang, Ruolin; Zhu, Yangge; Li, Bicheng; Song, Zhenguo

doi:10.3389/fchem.2019.00645

Cited by 22 publications

(2 citation statements)

References 40 publications

(54 reference statements)

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“…A total organic carbon (TOC) detector (TOC-Veph, Kyoto, Japan) was used to measure the amounts of SDAA or NaOL adsorbed on scheelite and fluorite based on the residual content method [4,23]. The sample treatment method used in the adsorption capacity test process was the same as in the flotation process, except that there was no flotation process.…”

Section: Surface Adsorption Detectionmentioning

confidence: 99%

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: Surface Adsorption Detectionmentioning

confidence: 99%

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

et al. 2022

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“…Interestingly, in the study of crystal chemistry, the distance of the PASP functional groups seemed to match the distance between the calcium atoms on the calcite surfaces, enabling the application of PASP to selectively depress calcite. Pb-BHA complexes, as a new collector, recognize the oxygen atom group during an interaction with calcium-containing minerals, which are fundamentally different from the traditional anion collectors [34][35][36]. Therefore, a scheme that combines PASP and Pb-BHA for separating scheelite from calcite has considerable application potential.…”

Section: Introductionmentioning

confidence: 99%

A Highly Selective Reagent Scheme for Scheelite Flotation: Polyaspartic Acid and Pb–BHA Complexes

Wei

Han

et al. 2020

Minerals

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Previous studies have proved that the lead complexes of benzohydroxamic acid (Pb–BHA) are effective collectors of scheelite flotations; however, the separation of scheelite from calcite needs depressants with high selectivity. In this study, we reported a novel depressant for calcite minerals, and Pb–BHA served as the collector of scheelite. The flotation behavior of polyaspartic acid (PASP) in a scheelite and calcite flotation that uses Pb–BHA was determined via flotation experiments. Furthermore, the selective adsorption of PASP on the mineral surfaces and the effect of PASP on the adsorption of Pb–BHA on the mineral surfaces were investigated through zeta potential measurements, X-ray photoelectron spectroscopy (XPS), crystal chemistry calculations, and Fourier transform infrared spectroscopy (FTIR) measurements. Thus, PASP demonstrated high selectivity in both scheelite and calcite and contributed to the successful separation of scheelite from calcite. PASP exhibited a higher adsorption capacity and stronger chemisorption with the active sites of calcium atoms on the calcite surface. The crystal chemistry calculations indicated that the distance of the PASP functional groups matched with the calcium distance of a calcite mineral surface, which can be attributed to the selectivity of PASP. Furthermore, the adsorption of PASP impeded the adsorption of Pb–BHA on the calcite surfaces, whereas the opposite was the case for scheelite. The mutually reinforcing selectivity of PASP and Pb–BHA considerably contributes to the efficient flotation separation of scheelite from calcite.

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