Results 251 to 260 of about 19,486 (279)
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Economic Geology, 1997
The textures and chemical compositions of sphalerite containing chalcopyrite and pyrrhotite inclusions from some skarns, together with experimental data on diffusivity, have permitted rates of exsolution (speedometry) and cooling histories of the skarns to be calculated.
Steven D. Scott, Toshio Mizuta
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The textures and chemical compositions of sphalerite containing chalcopyrite and pyrrhotite inclusions from some skarns, together with experimental data on diffusivity, have permitted rates of exsolution (speedometry) and cooling histories of the skarns to be calculated.
Steven D. Scott, Toshio Mizuta
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Proceedings of the Indian Academy of Sciences - Section A, 1965
Kullerud’s method of formation-temperature determination has been applied to the polymetallic sulphide deposits of Sadon in Northern Caucasus, U.S.S.R. The sulphide ore occurs at three places, separated by a few kilometers from each other. They are Sadon, Zgid and Holst. Mineralogical assemblage is sphalerite, galena, pyrite and pyrrhotite. It is found
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Kullerud’s method of formation-temperature determination has been applied to the polymetallic sulphide deposits of Sadon in Northern Caucasus, U.S.S.R. The sulphide ore occurs at three places, separated by a few kilometers from each other. They are Sadon, Zgid and Holst. Mineralogical assemblage is sphalerite, galena, pyrite and pyrrhotite. It is found
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Defects in the sphalerite structure
Journal of Physics and Chemistry of Solids, 1962Abstract Hornstra's method for drawing the arrangements of the atoms in the cores of dislocations in covalently bonded crystals is applied to the sphalerite structure. Bond rearrangement and dislocation dissociation into an extended form are considered and the implications are discussed. A crude calculation of bond strain energy indicates that Haasen'
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International Journal of Mineral Processing, 1994
Abstract The intensive grinding of sphalerite or sphalerite-pyrite mixtures accelerates the extraction of zinc from sphalerite by the bacteria Thiobacillus ferrooxidans and as a consequence shorten the process of bacterial leaching. This grinding affects the solid-state properties of the sulphides.
M. Kušnierová +3 more
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Abstract The intensive grinding of sphalerite or sphalerite-pyrite mixtures accelerates the extraction of zinc from sphalerite by the bacteria Thiobacillus ferrooxidans and as a consequence shorten the process of bacterial leaching. This grinding affects the solid-state properties of the sulphides.
M. Kušnierová +3 more
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Economic Geology, 1940
New spectrographic analyses and previously published information provided data concerning elements present in sphalerite in minor amounts. The variation in minor element content is correlated with the type of mineral deposit in which the sphalerite occurs.
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New spectrographic analyses and previously published information provided data concerning elements present in sphalerite in minor amounts. The variation in minor element content is correlated with the type of mineral deposit in which the sphalerite occurs.
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Economic Geology, 1973
Electron microprobe analyses, variation in FeS and MnS content, Taupo Volcanic Zone, New ...
J. F. Lovering, P. R. L. Browne
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Electron microprobe analyses, variation in FeS and MnS content, Taupo Volcanic Zone, New ...
J. F. Lovering, P. R. L. Browne
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Coupling leaching of sphalerite concentrate
Minerals Engineering, 2005Abstract Studies on coupling process of sphalerite concentrate leaching in H 2 SO 4 –HNO 3 and tetrachloroethylene extracting of sulfur were reported. Mechanism of coupling leaching and effects of adding amounts of C 2 Cl 4 , temperature and liquid-to-solid ratio on leaching process were investigated separately.
Peng Peng, Lizhu Lu, Huiqin Xie
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Kinetic Study of the Oxidation of Sphalerite
JOM, 1956The temperature and oxygen concentration dependence on the reaction of sphalerite in oxygen at pressures from 6 to 640 mm Hg have been investigated in the temperature range 700° to 870°C. Sphalerite has been found to oxidize linearly over this entire tem- perature and pressure range. At higher rates, considerable self-heating was observed.
W. Martin Fassell +2 more
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Experimental calibration of the sphalerite cosmobarometer
Geochimica et Cosmochimica Acta, 1983Abstract The pressure and temperature dependence of the composition of sphalerite in equilibrium with troilite + metallic iron has been determined experimentally at 2.5 and 5.0 kbar between 400° and 800°C using both the aqueous and anhydrous alkali halide flux recrystallization techniques.
Murray N. Hutchison, Steven D. Scott
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Aggregation of sphalerite: role of zinc ions
Journal of Colloid and Interface Science, 2003Sphalerite from six sources is shown to aggregate at ca. pH 7-9, confirmed by different techniques (settling velocity, suspension analysis, and optical microscopy). This does not correlate with the isoelectric point, which is consistently < pH 6. A similar observation was made by Healy and Jellet [J. Colloid Interface Sci. 24 (1967) 41-46] for ZnO (and
James A. Finch +2 more
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