Acid leaching of scheelite concentrates
Keywords:Leaching, acid, concentrate, tungsten, scheelite
The acid leaching in hydrochloric media of a tungsten concentrate (scheelite, CaWO4) was studied. Of the above-mentioned, an insoluble solid (H2WO4) was obtained which were treated with an alkaline solution of sodium hydroxide, achieving the complete solubilization of the tungsten as wolframate ion (WO4-2 ). The transformed fraction of tungsten increases with the temperature, as well as with a finer grain. A maximum dissolution of 88.5 % (400 g/1 HCl, 363 K and 20 µm of particle size) was achieved for a 3 h process, of the disolution process was interpreted by the recessive core model with formation of a layer of solid product for the whole range of variation of the parameters in study. The activation energy value was found to be 28.0 kj/mol
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