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Minerals 2016, 6(3), 92;

The Effect of Chloride Ions on the Activity of Cerussite Surfaces

State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
Kunming Metallurgical Research Institute, Kunming 650031, China
Authors to whom correspondence should be addressed.
Academic Editor: Athanasios Godelitsas
Received: 16 July 2016 / Revised: 27 August 2016 / Accepted: 30 August 2016 / Published: 6 September 2016
(This article belongs to the Special Issue Mineral Surface Science and Nanogeoscience)
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Chloride ions were found to potentially increase activity of cerussite surfaces. Dissolution experiments, zeta potential measurements, X-ray photoelectron spectroscopy (XPS) studies, and density functional theory (DFT) computation were conducted in this study. Dissolution experiments showed that the lead ion concentrations in the NaCl solution system were lower than those in the deionized water system and that the lead ion concentrations in NaCl + Na2S aqueous systems decreased by approximately one order of magnitude compared with that in the Na2S system alone. Results of zeta potential measurements revealed that the pretreatment with chloride ions of cerussite caused a more positive zeta potential than that without chloride ions. XPS analysis results indicated that the number of lead ions on the mineral surface increased after cerussite was treated with chloride ions. Results of DFT computation implied that the number of lead atoms on the mineral surface increased and that the activity improved after PbCl+ was adsorbed onto the cerussite surface. The contribution of chloride ions to the activity on the mineral surface is attributed to the increase in the number of active sites and enhancement in the activity of these sites, resulting in improved sulfidization and flotation performance. View Full-Text
Keywords: cerussite; active sites; chloride ions; adsorption; DFT cerussite; active sites; chloride ions; adsorption; DFT

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Feng, Q.; Wen, S.; Cao, Q.; Deng, J.; Zhao, W. The Effect of Chloride Ions on the Activity of Cerussite Surfaces. Minerals 2016, 6, 92.

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