Activation role of lead ions in benzohydroxamic acid flotation of oxide minerals: New perspective and new practice

Tian, Mengjie; Gao, Zhiyong; Sun, Wei; Han, Haisheng; Sun, Lei; Hu, Yuehua

doi:10.1016/j.jcis.2018.05.113

Cited by 105 publications

(26 citation statements)

References 75 publications

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“…Actually, the activation mechanisms of metal ions on mineral surfaces have been research hotspots in the field of flotation [15,16]. Divalent ions, such as Cu 2+ , Pb 2+ , Ca 2+ , etc., are widely used to activate specific mineral surfaces [15,[17][18][19]. Calcium ion possesses more widespread applications for separating quartz from other valuable minerals compared with most other metallic ions [17,20].…”

Section: Introductionmentioning

confidence: 99%

“…Long et al [28] confirmed by researching the effects of the three typical thiol collectors on galena and sphalerite in the presence of water on the basis of the first principles, that there existed distinct differences in the electron distribution, the atoms' activity on the mineral's surface, and the interactions between the collectors and the minerals. It is worth mentioning that metal ions in aqueous systems will experience complex behaviors to generate hydrated metal ions cluster [18,[29][30][31], which has profound impacts on the interactions between collectors and the mineral surface. Wang et al [32] conducted an in-depth simulations study on the activation mechanism of calcium ions on quartz and found that the major activation component of calcium ions adsorbed on the surface of quartz was (Ca(H 2 O) 4 ) 2+ which transformed into (Ca(H 2 O) 3 (OH)) + after the adsorption process.…”

Section: Introductionmentioning

confidence: 99%

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Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Zhang

Hu$^{

et al. 2019

Minerals

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A scientific and rigorous study on the adsorption behavior and molecular mechanism of collector sodium oleate (NaOL) on a Ca2+-activated hydroxylated α-quartz surface was performed through experiments and density functional theory (DFT) simulations. The rarely reported hydroxylation behaviors of water molecules on the α-quartz (101) surface were first innovatively and systematically studied by DFT calculations. Both experimental and computational results consistently demonstrated that the adsorbed calcium species onto the hydroxylated structure can significantly enhance the adsorption of oleate ions, resulting in a higher quartz recovery. The calculated adsorption energies confirmed that the adsorbed hydrated Ca2+ in the form of Ca(H2O)3(OH)+ can greatly promote the adsorption of OL− on hydroxylated quartz (101). In addition, Mulliken population analysis together with electron density difference analysis intuitively illustrated the process of electron transfer and the Ca-bridge phenomenon between the hydroxylated surface and OL− ions. This work may offer new insights into the interaction mechanisms existing among oxidized minerals, aqueous medium, and flotation reagents.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Zhang

Hu$^{

et al. 2019

Minerals

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“…Xie et al [16] also explored activated carbon (AC), vanadium oxide (V 2 O 5 ), and V 2 O 5 /AC photocatalyst prepared by in situ utilization of stone coal ore by XRD, XRF, Fourier transformation infrared spectroscopy (FTIR), SEM, Brunauer-Emmett-Teller (BET), and thermogravimetric-differential thermal analyzer (TG-DTA). In addition, Gao et al [27][28][29][30] explored the nature of minerals by calculating surface broken bonds combined with mineralogical features. Therefore, the mineralogical characteristics of stone coal can serve as a guide for subsequent work on stone coal.…”

Section: Introductionmentioning

confidence: 99%

A Comparison of Mineralogical and Thermal Storage Characteristics for Two Types of Stone Coal

Xie

et al. 2019

Minerals

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Understanding the mineralogical and chemical characteristics of stone coal is imperative for exploring the thermal storage characteristics of stone coal. Two types stone coal (SCwt and SChc) were sampled from the pond of a stone coal mine in Henan province (China), and the chemical composition, phase composition, and thermal behavior of the stone coal were investigated. Furthermore, the petrography of the stone coal was studied in detail. The mineral phases of the stone coal were quartz, kaolinite, roscoelite, and goethite, as distinguished by reflected light microscopy and further proven by scanning electron microscope-energy dispersive spectrometer (SEM-EDS). The thermal conductivity of SCwt was 0.19 W m−1 K−1, while that of SChc was 0.24 W m−1 K−1. Stearic acid (SA) was blended with SCwt and SChc to prepare SA/SCwt and SA/SChc composites via an impregnation method, respectively. The thermogravimetric (TG) curves show that the loading capacity of SChc, at 17.40%, is higher than that of SCwt (16.63%). The thermal energy storage capacities of SA/SCwt and SA/SChc composites were 29.21 J g−1 and 33.02 J g−1 according to a differential scanning calorimetry (DSC) analysis. Therefore, SChc is a potential candidate for thermal storage applications due to more obvious thermal storage characteristics, including higher thermal conductivity and loading capacity.

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“…Few research studies have focused on the formation and configuration of Pb-BHA complexes in solution or on a mineral surface (Tian et al, 2017, 2018a,b; Yue et al, 2017; He et al, 2018b; Hu et al, 2018; Cao et al, 2019). In particular, solution-chemistry-based studies of the respective components of Pb-BHA complexes in cassiterite flotation (Tian et al, 2017, 2018a,b; Cao et al, 2019) showed that lead ions and their hydroxide ions form Pb(H 2 O) and Pb(OH)(H 2 O) with water and then react with the BHA anion to produce HO-Pb-BHA complexes. He et al (2018a,b) characterized the structure of Pb-BHA complexes in aqueous solutions through theoretical calculations and quantum chemical simulations; the results showed that the Pb-BHA complexes existed mainly in the form of Pb-(BHA) n = 1, 2 at various solution pH values, and first-principles calculations indicated that Pb(BHA) + is the most stable structure.…”

Section: Introductionmentioning

confidence: 99%

Structures of Pb-BHA Complexes Adsorbed on Scheelite Surface

Wei

Sun

et al. 2019

Front. Chem.

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Previous studies have shown that Pb-BHA complexes (lead complexes of benzohydroxamic acid) have better collecting ability and can be used in flotation experiments with BHA acting as a collector and lead ions acting as activators. However, the structures of Pb-BHA complexes adsorbed on a mineral surface remain unclear. In this work, the adsorption behavior of Pb-BHA complexes on the scheelite surface was studied by flotation experiments and adsorption capacity measurements, and the structures of the adsorbed Pb-BHA complexes were determined using X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). The adsorption capacity results showed that more BHA was adsorbed on the scheelite surface in Pb-BHA flotation, and the XPS and TOF-SIMS analysis showed that the species of Pb-BHA complexes adsorbed on the scheelite surface were similar in activation flotation and Pb-BHA flotation. Therefore, the different contents of the complexes on the scheelite surface were responsible for the flotation behavior. XPS and TOF-SIMS showed that BHA combined with lead ions to form complexes with different structures, such as five- and four-membered ring structures. Structure fragment inference based on the measurements indicated that lead ions formed monomer complexes with two BHAs, and that lead hydroxide polymers with a certain degree of polymerization bonded with oxygen atoms in the complexes. The Pb-BHA complexes combine with oxygen atoms on the scheelite surface to form an adsorbate, rendering the surface hydrophobic.

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Activation role of lead ions in benzohydroxamic acid flotation of oxide minerals: New perspective and new practice

Cited by 105 publications

References 75 publications

Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

Novel Insights into the Hydroxylation Behaviors of α-Quartz (101) Surface and its Effects on the Adsorption of Sodium Oleate

A Comparison of Mineralogical and Thermal Storage Characteristics for Two Types of Stone Coal

Structures of Pb-BHA Complexes Adsorbed on Scheelite Surface

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