Next Article in Journal
Alumina Extraction from Coal Fly Ash via Low-Temperature Potassium Bisulfate Calcination
Next Article in Special Issue
Cupric and Chloride Ions: Leaching of Chalcopyrite Concentrate with Low Chloride Concentration Media
Previous Article in Journal
Further Characterization of the RW-1 Monazite: A New Working Reference Material for Oxygen and Neodymium Isotopic Microanalysis
Previous Article in Special Issue
The Effect of Sodium Alginate on Chlorite and Serpentine in Chalcopyrite Flotation
Open AccessArticle

Zeta Potential of Pyrite Particles in Concentrated Solutions of Monovalent Seawater Electrolytes and Amyl Xanthate

1
Department of Chemical Engineering and Laboratory of Surface Analysis (ASIF), University of Concepción, P.O. Box 160-C, Correo 3, 4030000 Concepción, Chile
2
Department of Food Engineering, Universidad del Bio-Bio, P.O. Box 447, 3780000 Chillán, Chile
3
Department of Metallurgical Engineering, Universidad de Concepción, PO Box 160-C, Correo 3, 4030000 Concepción, Chile
*
Authors to whom correspondence should be addressed.
Minerals 2019, 9(10), 584; https://doi.org/10.3390/min9100584
Received: 10 July 2019 / Revised: 6 August 2019 / Accepted: 7 August 2019 / Published: 27 September 2019
(This article belongs to the Special Issue Hydrometallurgical Processing of Base Metal Sulphides)
Charge screening and adsorption capacity of monovalent ions onto pyrite (Py) in aqueous suspensions and the effect of potassium amyl xanthate (PAX) has been studied by measuring the changes in zeta potential (zp) versus pH with streaming potential. PAX addition in the absence of salts leads to an increase in |zp| suggesting dissolution of the surface ferric hydroxides and recovery of bare Py, corroborating existing theories. In the presence of salt, addition of PAX at pH > 6, for which hydroxides interference in not expected, has little effect over the zp, except when Li is present. The water network around the polar head of PAX is expected to be similar to that of hydrated Li+ facilitating the linkage between them and, thus, the formation of Li-mediated Py–PAX bridges. We speculate that these bridges lead to a xanthate shield around anionic sites on Py, decreasing |zp|. An increased PAX dose amplifies the effect of Li as a Py activator but only at low salt. At high salt concentrations, >0.01 M, PAX molecules do not find room to percolate to the surface of Py. Results for monovalent cations should improve our understanding of copper flotation processes in the presence of Py in saltwater. View Full-Text
Keywords: pyrite; seawater; PAX; adsorption; zeta potential; viscosity pyrite; seawater; PAX; adsorption; zeta potential; viscosity
Show Figures

Figure 1

MDPI and ACS Style

Paredes, A.; Acuña, S.M.; Gutiérrez, L.; Toledo, P.G. Zeta Potential of Pyrite Particles in Concentrated Solutions of Monovalent Seawater Electrolytes and Amyl Xanthate. Minerals 2019, 9, 584.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop