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Phonons and electrons in chalcopyrite semiconductors
AIP Conference Proceedings, 2012In recent years the phonons and the electron phonon interaction of binary tetrahedral semiconductors have been profusely investigated by ab initio techniques and compared with experimental results. Of particular interest have been binary compounds in which the cations contain semi-core d-electrons (CuCl, CuI, AgI) which display anomalies related to ...
Cardona, M. +5 more
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The Influence of pH and Ferrous Ions on Chalcopyrite Dissolution in Chemical Leaching Chalcopyrite
Advanced Materials Research, 2014This paper studied the influence of pH, temperature and particle size on the chemical leaching of chalcopyrite. The results show that H+is not only responsible for the hydrolysis and precipitation of ferric ion as jarosite, but also related directly to chalcopyrite dissolution.
Xiao Lan Mo +4 more
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2010
The anodic dissolution of chalcopyrite has been examined in chloride and sulphate solutions from 20°C to 175°C. In chloride the yield of elemental sulphur is nearly 100%, whereas in sulphate solutions it is 75% or less, the remainder being oxidized. It is postulated that in sulphate solutions the copper dissolves as a thiosulphate complex, which can ...
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The anodic dissolution of chalcopyrite has been examined in chloride and sulphate solutions from 20°C to 175°C. In chloride the yield of elemental sulphur is nearly 100%, whereas in sulphate solutions it is 75% or less, the remainder being oxidized. It is postulated that in sulphate solutions the copper dissolves as a thiosulphate complex, which can ...
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The electroleaching of bornite and chalcopyrite
Hydrometallurgy, 1980Abstract The electroleaching reactions of bornite and chalcopyrite have been investigated by a study of the anode-potential/time relationships and examination of the products by electron microprobe analysis and X-ray diffraction, with particular reference to current and energy efficiencies. The effects of solution composition, temperature and current
D.C. Price, J.P. Chilton
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Journal of Central South University of Technology, 2002
The effects of silver sulfide (Ag2S) on the bioleaching of chalcopyrite and pyrite were investigated in this paper. It has been shown that Ag2S enhanced the yields of bioleaching of chalcopyrite but inhibited the bio-oxidation of pyrite. The addition of Ag2S selectively increased the copper dissolution from the chalcopyrite-containing ores in shake ...
Yue-hua Hu +3 more
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The effects of silver sulfide (Ag2S) on the bioleaching of chalcopyrite and pyrite were investigated in this paper. It has been shown that Ag2S enhanced the yields of bioleaching of chalcopyrite but inhibited the bio-oxidation of pyrite. The addition of Ag2S selectively increased the copper dissolution from the chalcopyrite-containing ores in shake ...
Yue-hua Hu +3 more
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Semiconductors with Chalcopyrite Structure
Nature, 1956IT was recently reported1 that certain compounds crystallizing with a triply substituted diamond lattice of the chalcopyrite type are semiconductors. We would report here optically determined energy gaps for a further four such compounds. These, together with the previously reported values for copper indium selenide and copper iron sulphide, are shown ...
I. G. AUSTIN +2 more
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International Journal of Mineral Processing, 2015
Abstract The impact of pulp aeration on chalcopyrite flotation in chalcopyrite–pyrite pulps containing different pyrite content (0–80 wt.%) and using xanthate as a collector is reported. Laboratory flotation tests showed significant improvement in chalcopyrite flotation performance under moderate aeration conditions but a significant decrease of ...
Owusu, C. +3 more
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Abstract The impact of pulp aeration on chalcopyrite flotation in chalcopyrite–pyrite pulps containing different pyrite content (0–80 wt.%) and using xanthate as a collector is reported. Laboratory flotation tests showed significant improvement in chalcopyrite flotation performance under moderate aeration conditions but a significant decrease of ...
Owusu, C. +3 more
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Dynamics of the chalcopyrite lattice
Soviet Physics Journal, 1970The symmetry properties of the normal modes of the chalcopyrite lattice are analyzed. The phonon spectra of chalcopyrite and sphalerite are compared. There is a discussion of the intensity of the IR absorption lines due to single-phonon processes. Selection rules are found for direct and indirect transitions. Carrier scattering by phonons is analyzed.
G. F. Karavaev +2 more
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Hydrothermal synthesis of chalcopyrite
Economic Geology, 1966Natural chalcopyrite was dissolved by NaCl solution at the warmer end of a reaction vessel and synthetic chalcopyrite was precipitated at the cooler end at temperatures of 400 degrees -500 degrees C. No transfer occurred with pure water.
W. M. Barnard, P. A. Christopher
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Mössbauer Studies of Chalcopyrite
Journal of the Physical Society of Japan, 1968Mossbauer spectra of naturally occurring mineral chalcopyrite have been studied over a temperature range 300°–448°K. The spectra showed a typical pattern of six absorption lines due to the internal magnetic field. The Q.S. have values which are independent of temperature whereas the magnitudes of the internal magnetic field are 325{±}10, 312{±}10 and ...
Deo Raj, K. Chandra, S. P. Puri
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