Abstract
The chlorination of wolframite and of scheelite with chlorine (chlorination agent) and sulphur dioxide (reducing agent) was studied within the temperature range 673–1173 K. The tests were carried out in a vertical reactor with a static bed. The greatest tungsten extractions (1173 K) were 86% from wolframite and 33% from scheelite. The behaviour of the chlorination reactions was analyzed through characterization of the reaction products obtained in each case. The principal reaction products identified were WO 2Cl 2, FeCl 3, CaSO 4 and CaCl 2. Likewise, size changes, specific surface areas and surface contents of calcium, tungsten, iron and manganese of both ores were studied during chlorination. By means of kinetic models it was determined that the wolframite chlorination is controlled by the movement of an interface and that the presence of reaction products affects the scheelite chlorination. Finally, a possible stoichiometry was proposed to explain the reaction of oxygen contained in the wolframite and in the scheelite.
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