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• W2955763810 abstract "In the processing and flotation concentration of sulfide polymetallic ores, it is important to understand the oxidation mechanisms of the surfaces of separated sulfides along with the structure and properties of oxidized fragments of the surfaces. The authors investigated earlier the effect of high-power nanosecond electromagnetic pulses (HPEMP: E ~10(7) V/m; I„(pulse)~10 ns) on the phase composition and the electrochemical, sorption and flotation properties of semiconductor ore minerals pyrrhotite, pentlandite, Nhalcopyrite, sphalerite and other sulfide minerals (Bunin, Chanturiya et al, Shechtman International Symposium, 2014).In this report, we present new experimental data on varying the composition and chemical state of surface atoms of galenite (PbS, galena) and calcite (CaCO3) before and after treatment by high-voltage nanosecond pulses. The effect of nanosecond pulses on the phase composition of a galenite and calcite surface is investigated by means of X-ray photoelectron spectroscopy (XPS) and IR Fourier spectroscopy. According to the XPES data, structural phase transformations caused by pulsed treatment are mainly associated with variations in the chemical state of sulfur atoms. The chemical state of the lead surface lead atoms did not vary much after the pulsed treatment.The results from spectroscopic investigations agree with the data on the effect HPEMP has on the electrochemical and flotation properties of galenite: electromagnetic pulsed treatment produces structural phase transformations of the surface layer of mineral particles, which leads to variations in the energetic state of crystals and raises their electrode potential by ~15 mV on average in the region of positive values (pH 6-11). An increase in the electrode potential creates favorable conditions for adsorption of the anion collector and helps amplify the flotation activity of galenite: flotation experiments (pH 10.2) showed an increase in the floatability of galenite, from 76% (without preliminary pulsed treatment) to 86% after 10-30 s of HPEMP treatment for the samples.At the same time, it has been found experimentally that pulsed treatment did not cause significant changes in the phase composition, chemical state of the surface atoms and flotation (xanthate) activity of calcite." @default.
• W2955763810 created "2019-07-12" @default.
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• W2955763810 date "2015-03-08" @default.
• W2955763810 modified "2023-09-27" @default.
• W2955763810 title "The Prospects for the Use of High-Power Nanosecond Pulses to Flotation Separation of Sulfides from Rock-Forming Minerals" @default.
• W2955763810 hasPublicationYear "2015" @default.
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