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Minerals 2018, 8(8), 341; https://doi.org/10.3390/min8080341

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

1
School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
2
Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
*
Author to whom correspondence should be addressed.
Received: 5 July 2018 / Revised: 2 August 2018 / Accepted: 4 August 2018 / Published: 8 August 2018
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Abstract

The activation mechanism of lead ions (Pb2+) 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 Pb2+ 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 Pb2+, and the maximum recovery of 57.93% was obtained at pH 5.7 without Pb2+. At pHs below 7, lead species are mainly present as Pb2+ and PbOH+ in the solution; besides this, the relative content of titanium increases on the perovskite surface. The adsorption of Pb2+ 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 Pb2+-activated perovskite and forms hydrophobic Pb-OHA complexes, which improve the flotability of perovskite. View Full-Text
Keywords: perovskite; flotation; octyl hydroxamic acid; lead ions; activation perovskite; flotation; octyl hydroxamic acid; lead ions; activation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zheng, Y.; Cui, Y.; Wang, W. Activation Mechanism of Lead Ions in Perovskite Flotation with Octyl Hydroxamic Acid Collector. Minerals 2018, 8, 341.

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