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Journal ArticleDOI: 10.1080/01496395.2017.1377249

Utilization of pyrogallol in flotation separation of scheelite from calcite

04 Mar 2021-Separation Science and Technology (Taylor & Francis)-Vol. 56, Iss: 4, pp 738-745
Abstract: Scheelite is a typical tungsten-containing mineral and usually co-exists with calcite in deposits. The flotation separation of scheelite from calcite is a hard work in mineral processing. In this p...

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Topics: Scheelite (57%), Calcite (55%), Mineral processing (51%) ... show more

5 results found

Journal ArticleDOI: 10.1016/J.MINENG.2018.06.008
Wei Chen1, Wei Chen2, Qiming Feng1, Guofan Zhang1  +1 moreInstitutions (2)
Abstract: In this paper, sodium phytate, a phosphate ester salt rich in phosphate groups, was evaluated as a flotation depressant for selective separation of scheelite from calcite. Its adsorption mechanism on the mineral surface was also investigated through zeta potential and FTIR spectra analysis. The micro flotation results of both single and mixed binary minerals showed that sodium phytate exhibited strong depressant effect on calcite flotation while had little influence on scheelite flotation, when it was added before the collector sodium oleate. Using sodium phytate as depressant improved the flotation separation of scheelite from calcite in the pH range of 7–12. The results of zeta potential measurements and FTIR spectra analysis demonstrated that sodium phytate adsorbed on the calcite surface and hindered the subsequent chemisorption of sodium oleate. The chelating adsorption mainly consisted of the interactions between Ca2+ on calcite surface and the PO tetrahedron in sodium phytate. Sodium phytate did not adsorb on the surface of scheelite and did not hinder the subsequent coverage by the collector sodium oleate. Based on these findings, sodium phytate has the potential to act as an effective depressant in flotation separation of scheelite from calcite.

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Topics: Scheelite (51%)

69 Citations

Journal ArticleDOI: 10.1016/J.JCLEPRO.2020.125322
Shangyong Lin1, Jianyong He1, Runqing Liu1, Yuehua Hu1  +1 moreInstitutions (1)
Abstract: Pyrogallol, an eco-friendly derivative of tannic, was a potential substitute of toxic depressant used in bismuth-molybdenum (Bi–Mo) sulfide ore flotation. However, unclear depression mechanisms of pyrogallol on bismuth sulfides hindered its further application in the industry. In this work, the effect of pyrogallol on the flotation performance of bismuthinite was evaluated using flotation tests, and associated interaction mechanisms were investigated by using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations. Micro-flotation tests showed that pyrogallol exhibited excellent depressing performance to bismuthinite in the whole pH range tested (2–12). In the presence of 300 g/t pyrogallol, over 95% of bismuthinite was effectively depressed in the real flotation process at pH around 9. FTIR and XPS results demonstrated that pyrogallol was chemisorbed on bismuthinite through the interactions among Bi atoms exposed on the bismuthinite surface and O−H groups in pyrogallol. The adsorption mechanism was further ascertained by DFT calculations, which revealed that the Bi–O–C single bond and the five-membered ring complex models were involved in the chemisorption of pyrogallol on bismuthinite surface. The work presented here not only provides new insights into the inhibition mechanisms of pyrogallol on bismuthinite but also provides theoretical support for the industrial application of pyrogallol.

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Topics: Bismuthinite (61%), Pyrogallol (60%)

4 Citations

Journal ArticleDOI: 10.1016/J.APSUSC.2020.148506
Jianyong He1, Qiqi Zhou1, Shengda Chen1, Mengjie Tian1  +2 moreInstitutions (1)
Abstract: In this work, the interfacial microstructures and adsorption mechanisms of benzohydroxamic acid (BHA) on Pb2+-activated cassiterite (1 1 0) surface were investigated by means of Raman spectroscopy, atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM) and density functional theory (DFT) calculations. AFM images showed that the roughness value of the natural cassiterite surfaces decreased after the treatment of Pb2+ and BHA with respect to the clean surface. The experimental high-resolution XPS spectra and the DFT calculated spectral lines consistently showed that the major surface species was the Pb-BHA complex on the cassiterite surface. The new peak of N1s at 401.88 eV in the X-ray photoelectron spectroscopy of cassiterite surface treated by BHA showed that BHA could be also chemically adsorbed on the surface. The Raman spectra revealed that the peak around 268 cm−1 should be attributed to the Pb-O bonds in the interface bonding structure of BHA-Pb-O≡. HR-TEM images of the clean, Pb2+ and Pb2+||BHA (adding BHA after Pb2+)-treated interfaces further demonstrated the interfacial microstructures. This work showed a new light on the understanding of the interface adsorption mechanism of flotation reagent and the activation mechanism of metal ion on oxidized mineral.

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Topics: X-ray photoelectron spectroscopy (53%), Adsorption (52%), Cassiterite (52%) ... show more

3 Citations

Journal ArticleDOI: 10.1016/J.MINENG.2020.106485
Jianyong He1, Yuehua Hu1, Wei Sun1, Chenyang Zhang1  +3 moreInstitutions (2)
Abstract: Interaction mechanisms of flotation reagents including pyrogallic acid (pyGA), GA and tannic acid (TA) adsorption onto fluorite (1 0 0) and calcite (1 0 4) surfaces were investigated by first-principles calculations, molecular mechanics (MM) and molecular dynamics (MD) approaches under vacuum phases to understand the spatial effects of molecules. First-principles calculations indicated that GA/pyGA could more strongly adsorb onto the fluorite surface than onto the calcite surface, but MM and MD results indicated TA tended to adsorb onto the calcite surface rather than the fluorite surface. These results were consistent with reported flotation results. Further analysis showed that the interaction difference was ascribed to the different balance of the corresponding chemical and van der Waals forces on different mineral surfaces.

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Topics: Adsorption (52%)

1 Citations

Journal ArticleDOI: 10.1016/J.SEPPUR.2021.118670
Guang Han1, Shuming Wen1, Han Wang1, Qicheng Feng1  +1 moreInstitutions (1)
Abstract: Effective and low-cost flotation separation of chalcopyrite and pyrite has always been a challenge in the minerals processing industry. Traditional depressants in a Cu–Fe sulfide flotation system, such as lime, tend to require a high dosage and have low selectivity. We investigated the effect of pyrogallic acid on the flotation separation of chalcopyrite and pyrite. After treatment with pyrogallic acid under appropriate conditions, pyrite recovery dropped by 65%, while that of chalcopyrite dropped only slightly. Adsorption measurements showed that pyrogallic acid significantly reduced the amount of sodium butyl xanthate adsorption on the pyrite surface. Zeta potential, infrared, and X-ray photoelectron spectroscopy analyses confirmed that pyrogallic acid most likely interacts with pyrite surface via chemisorption with Fe sites, and thereby strengthens the hydrophilicity of the pyrite particles. Localized electrochemical impedance spectroscopy measurements further indicated that pyrogallic acid could significantly adsorb on the pyrite surface. Therefore, Pyrogallic acid could be a promising depressant for pyrite and provide flotation separation of Cu–Fe sulfide ores under low-alkalinity conditions.

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Topics: Pyrite (56%), Chalcopyrite (53%), Sulfide (52%)

1 Citations


19 results found

Open accessBook
01 Aug 1978-
Topics: Infrared spectroscopy (51%)

208 Citations

Journal ArticleDOI: 10.1016/J.MINENG.2015.06.017
Abstract: The flotation separation of scheelite from calcite using sodium oleate as collector and acidified sodium silicate as depressant has been studied. The results show that sodium oleate has collecting ability to both scheelite and calcite and the flotation separation of scheelite from calcite cannot be realized if collector is used only. The depressant acidified sodium silicate has selective depression effect on calcite and the optimum ratio of sodium silicate to oxalic is 3:1. The use of acidified sodium silicate as depressant can achieve the flotation separation of scheelite from calcite. Infrared studies and zeta potential measurements showed that the pre-adsorption of acidified sodium silicate interferes with the adsorption of sodium oleate on calcite surface while does not interfere with its adsorption on scheelite surface.

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Topics: Sodium silicate (56%), Scheelite (52%), Calcite (51%)

140 Citations

Journal ArticleDOI: 10.1016/J.COLSURFA.2012.09.038
Yuehua Hu1, Zhiyong Gao1, Wei Sun1, Xiaowen Liu1Institutions (1)
Abstract: Anisotropic surface broken bond densities and surface energies of six surfaces of scheelite were calculated with density functional theory (DFT). The calculation results show that its surface energy is directly proportional to its surface broken bond density. {1 1 2} and {0 0 1} surfaces are the two predominant cleavage or exposed planes. The prediction of morphology is well consistent with our experimental observations based on XRD. Anisotropic adsorption behaviors and wettability of these two surfaces after being immersed in sodium oleate and DDA solutions were studied by means of contact angle measurement, AFM and flotation test. The contact angle values at a given NaOl concentration decreased in the order {1 1 2} > {0 0 1}. As for DDA, similar wettability for the two surfaces was observed. The results were interpreted by AFM and interaction energies for the adsorption of surfactants on each surface calculated in accordance with molecular dynamics (MD) simulation.

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Topics: Surface energy (57%), Contact angle (55%), Adsorption (53%) ... show more

115 Citations

Journal ArticleDOI: 10.1006/JCIS.2001.7994
Pradip1, Beena Rai1, T. K. Rao1, Shailaja Krishnamurthy2  +3 moreInstitutions (2)
Abstract: The results of theoretical computations on the molecular modeling of mineral–reagent interactions in a fluorite-calcite-fluorapatite–alkyl hydroxamate separation system were found to correlate remarkably well with the experimental microflotation test results. The utility of molecular modeling tools in the design/screening of surfactant molecules for flotation separations is discussed.

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91 Citations

Journal ArticleDOI: 10.1016/J.MINENG.2017.07.016
Wei Chen1, Qiming Feng1, Guofan Zhang1, Qun Yang1  +1 moreInstitutions (1)
Abstract: In this paper, the effect of sodium alginate on the flotation separation of scheelite from calcite and fluorite using sodium oleate as collector was investigated. Flotation results showed that sodium alginate could selectively depress the flotation of calcite and fluorite in pH range of 7–12 when it was added before sodium oleate. The selective depressant effect of sodium alginate was studied using zeta potential measurements, contact angle measurements and FTIR. The zeta potential measurements results showed that sodium alginate exhibited little influence on the surface charge of scheelite but had remarkable effect on that of calcite and fluorite. The results of contact angle measurements indicated that sodium alginate could produce selective, non-recoverable decrease in surface hydrophobicity of calcite and fluorite. The FTIR studies demonstrated the chemical absorption of sodium alginate on calcite and fluorite surface and no form of adsorption on scheelite surface.

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Topics: Scheelite (53%), Calcite (51%)

85 Citations

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