2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 2: Mineral Processing
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 446 pages |
| ISBN: | 978-1-987820-04-1 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Effect of High-Power Nanosecond Pulses on Surface Structure and Flotation Properties of Sphalerite and Chalcopyrite
Igor Bunin1; Valentine Chanturiya1; Irina Khabarova1;1RESEARCH INSTITUTE OF COMPREHENSIVE EXPLOITATION OF MINERAL RESOURCES RUSSIAN ACADEMY OF SCIENCE, Moscow, Russian Federation;
Type of Paper: Regular
Id Paper: 68
Topic: 2
Abstract:
The effect of high-power (high-voltage) nanosecond electromagnetic pulses on chemical and phase surface composition, structural-chemical, electrophysical, electrochemical, physical-chemical and flotation properties of sulfide minerals has been studied in our previous investigations (see for example, Chanturiya V.A., Bunin I.Zh., Ryazantseva M.V., et al. Theory and Application of High-Power Nanosecond Pulses to Processing of Mineral Complexes // Mineral Processing and Extractive Metallurgy Review - 2011 - Vol. 32 .- No 2. - PP. 105-136).
This work presents new experimental data on possible mechanisms for the formation of micro- and nanostructures on the surfaces (surface nanophases) of sulfide minerals (sphalerite and chalcopyrite) under the effect of high-voltage nanosecond pulses.
The morphology, sizes, and elemental composition of nanostructures on chalcopyrite and sphalerite surface have been studied by scanning electron microscopy (SEM, LEO 1420 VP), X-ray spectral microanalysis (XRMA, EDS, INCA Oxford 350 X-ray microanalysis system), and scanning probe microscopy (AFM, INTEGRA Prima, NT-MDT).
The results of SEM-XRMA investigations of the surface structure of chalcopyrite and sphalerite indicate the formation of defects (breakdown channels and microcracks) and the forced formation of new micro- and nanophases on sulfide surfaces, due to electric pulse processing. In addition to intensity peaks corresponding to Fe, Cu, Zn, and S, a pronounced peak corresponding to oxygen has been traced in the X-ray spectrum of a surface from the region of localization of neoformations, possibly indicating the formation of autonomous and nonautonomous phases.
It is established that electrode potentials of chalcopyrite and sphalerite are moved together in the positive party owing to formation of cuprum, zinc and iron oxides (hydroxides) and cuprum, zinc and iron sulfates by nanosecond pulses that provides increase of xanthate sorption and increase in flotation extraction of these sulfides.