| This study aimed at obtaining some basic knowledge on the chlorination characteristics of synthetic scheelite. Favorable conditions were found to be the chlorine flow rate 580cc/min, mole ratio of scheelite to charcoal 1/6, particle size of scheelite and charcoal 200/325 mesh respectively, briquette size 5/7 mesh, and chlorination temperatures higher than 700℃. The chlorination could be described as the first order reaction, and the activation energies under such conditions were estimated to be 14.3 ㎉/mole and 3.8 ㎉/mole respectively in the temperature range of 500-600℃ and 600℃-900℃. This large difference in activation energy may be attributed to the change in reaction pass with varying reaction temperature. Two kinds of tungsten oxychloride such as WO₂Cl₂ and WOCl₄ were obtained as the products and each could be particularly formed with suitable selection of the temperature and the scheelite to charcoal mixing ratio. |
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