Abstract
In the summer of 1977 several 10 g samples of molybdenite ore containing 5–6 per cent Mo as MoS 2 were heated in one of the 2kW solar furnaces at the Laboratoire des Ultra-Refractaires, Odeillo, Frnace. The end products showed excellent separation with pure yellow acicular crystals of 9 + per cent MoO 3 and pure white SiO 2 powder being the two major components. Impurity levels in the MoO 3 did not exceed 6000 ppm while only a small fraction of the molybdenite was entrained along with the SiO 2. All treatment was done in a flowing oxygen atmosphere, and other elements condensed out at specific sites in the gas transport system. Analysis of the products was done by X-ray diffraction and X-ray fluorescence, emission spectroscopy, and wet chemical analysis. The ore was donated by Climax Molybdenum Co., Climax Co. The work is a joint effort of LASL and the Laboratoire des Ultra-Refractaires in Odeillo.
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