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Scheelite in northeastern Brazil
Economic Geology, 1945"About 60 scheelite localities are now known in the states of Paraiba and Rio Grande do Norte, northeastern Brazil, all of which have been discovered since early 1942, and production in the first 2 1/2 years of the new district has been about 2,500 metric tons of 70 percent WO 3 concentrates.
William Drumm Johnston +1 more
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Surface-Charge Anisotropy of Scheelite Crystals
Langmuir, 2016Atomic force microscopy was employed to measure the colloidal interactions between silicon nitride cantilever tips and scheelite crystal surfaces in 1 mM KCl solutions of varying pH. By fitting the Derjguin-Landau-Verwey-Overbeek (DLVO) theoretical model to the recorded force-distance curves, the surface-charge density and surface-potential values were
Zhiyong, Gao +3 more
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Polarization of thermoluminescence of various scheelites
Journal of Luminescence, 1981Abstract The polarization of the thermoluminescence of various scheelite type single crystals being correlated with the thermal decay of intrinsic hole centres has been measured. The crystals show partial z -polarization of the thermoluminescence. The degree of polarization of the glow light increases with increasing compression of the anionic X O ...
A. Hofstaetter +3 more
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The fluorination of scheelite with ammonium bifluoride
Journal of Thermal Analysis, 1992The interaction of scheelite with ammonium bifluoride was studied. It was shown that sheelite reacts with NH4HF2 at room temperature, in contrast with tungstic oxide and other tungsten compounds. Two complexes are formed (NH4)3WO3F3 and the previously unknown (NH4)2WO3F2. The compounds obtained were fluorinated to (NH4)3WO2F5 (endothermic peaks at 170°
N. M. Laptash +3 more
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Colloids and Surfaces, 1987
The solubility of scheelite was determined as a function of pH at a constant ionic strength of 10−2 kmol m−3 NaClO4, and a thermodynamic solubility product of (8.8 ± 0.1) × 10−9 at 298 K calculated by extrapolation of the experimental values to zero ionic strength.
K.I. Marinakis, G.H. Kelsall
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The solubility of scheelite was determined as a function of pH at a constant ionic strength of 10−2 kmol m−3 NaClO4, and a thermodynamic solubility product of (8.8 ± 0.1) × 10−9 at 298 K calculated by extrapolation of the experimental values to zero ionic strength.
K.I. Marinakis, G.H. Kelsall
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A Review on Flotation Process of Scheelite
Advanced Materials Research, 2014The flotation methods of scheelite, such as conventional flotation, heating flotation, lime flotation and their application were reviewed in this paper.
Ya Lin Lu +4 more
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Formation of scheelite-bearing and scheelite-barren skarns at Lost Creek, Pioneer Mountains, Montana
Economic Geology, 1977The three garnet and pyroxene zones which comprise the scheelite-bearing skarn in the study area show similar variations in mineral percentage and chemistry when compared to an adjacent garnet and pyroxene scheelite-barren skarn. Each of the zones in this dark brown skarn exhibits a smooth increase in percent total garnet toward the intrusive and then ...
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Crossover effects in scheelite DyLiF4
Physics of the Solid State, 2006The Zeeman effect, magnetization, and differential susceptibility of a DyLiF4 crystal in a pulsed magnetic field are studied experimentally and theoretically. It is found that Dy3+ ion levels in DyLiF4 approach each other and a crossover occurs in a magnetic field H ‖ [001], which leads to a smearing of peaks in the differential magnetic susceptibility
Z. A. Kazei +4 more
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Transformations in the reduction of scheelite concentrate
Steel in Translation, 2011The reduction kinetics of scheelite concentrate is considered in a heterogeneous system at 1523 K. The phase and other transformations that occur on reduction by carbon are investigated.
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