Study on the activation mechanism of lead ions in the flotation of ilmenite using benzyl hydroxamic acid as collector

Meng, Qingyou; Yuan, Zhulin; Li, Yu; Xu, Yuankai; Du, Yusheng

doi:10.1016/j.jiec.2017.12.059

Cited by 66 publications

(13 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…OHA species can be adsorbed on the nonpolar part of the former OHA species through hydrogen bonds [17,19]. Therefore, at a pH of about 6.5, the multi-layer adsorption of OHA species and the relative increase of the perovskite surface's active metal cations significantly increase the flotability of the perovskite [39][40][41][42][43]. OHA species can be adsorbed on the nonpolar part of the former OHA species through hydrogen bonds [17,19].…”

Section: Microflotation Experimentsmentioning

confidence: 99%

“…According to the solubility product pK sp of Pb 2+ ∼ = 15.2 [30,43], the solution chemistry of OHA can be calculated to generate the concentration logarithmic diagram of each component in different pH solutions. Figure 6 shows the logC-pH of the Pb 2+ hydrolysis components as functions of pH when the Pb 2+ concentration is 0.1 mM.…”

Section: Zeta-potential Measurementsmentioning

confidence: 99%

“…Obviously, both lead ions and OHA are adsorbed on the perovskite surface. In addition, lead species that are adsorbed on the mineral surface act as reaction sites and can be chelated by OHA [30,43]. Meanwhile, the remaining lead in the solution will react with OHA to form a Pb-OHA complex that can be adsorbed on the surface of the perovskite and increase its hydrophobicity [30,44].…”

Section: Zeta-potential Measurementsmentioning

confidence: 99%

“…The results of the adsorption tests show that after activation with lead ions, the OHA adsorbance on the perovskite surface significantly increases in the investigated pH range, which indicates that the lead ions promote the adsorption of OHA on the perovskite surface. This may be attributed to an increase in the number of active sites and the formation of more stable Pb-OHA species on the perovskite surface [43,44]. Figure 8 shows the FT-IR spectra of perovskite before and after adjustment with different agents.…”

Section: Zeta-potential Measurementsmentioning

confidence: 99%

“…The high-resolution XPS spectra of perovskite before and after Pb 2+ and OHA treatment are shown in Figure 9. Figure 9a shows that the Ti2p3/2 peaks of pure perovskite appeared at around 458 eV, corresponding to the Ti 4+ oxidation state [43]. After Pb 2+ activation, the Ti2p3/2 binding energy decreased by 0.73 eV.…”

Section: Xps Analysismentioning

confidence: 99%

See 4 more Smart Citations

Activation Mechanism of Lead Ions in Perovskite Flotation with Octyl Hydroxamic Acid Collector

2018

View full text Add to dashboard Cite

The activation mechanism of lead ions (Pb 2+ ) in perovskite flotation with an octyl hydroxamic acid collector was systematically investigated using microflotation experiments, zeta-potential measurements, adsorption tests, Fourier transform infrared (FT-IR) analysis, and X-ray photoelectron spectroscopy (XPS) analysis. The results of microflotation experiments and adsorption tests indicate that the presence of Pb 2+ can promote the adsorption of octyl hydroxamic acid (OHA) on the perovskite surface and enhance the flotability of perovskite under weakly acidic conditions. The maximum recovery of 79.62% was obtained at pH 6.5 in the presence of Pb 2+ , and the maximum recovery of 57.93% was obtained at pH 5.7 without Pb 2+ . At pHs below 7, lead species are mainly present as Pb 2+ and PbOH + in the solution; besides this, the relative content of titanium increases on the perovskite surface. The adsorption of Pb 2+ and PbOH + on the perovskite surface makes the zeta-potential of perovskite shift positively, and increases the number of activated sites on the perovskite surface. FT-IR and XPS analyses confirm that OHA chemisorbs on the surface of Pb 2+ -activated perovskite and forms hydrophobic Pb-OHA complexes, which improve the flotability of perovskite.

show abstract