| The leaching of galena with ferric chloride was investigated as a function of the particle size of the galena, stirring speed, ferric chloride concentration, the persence of sodium chloride and calcium chloride, and the reaction temperature. Also, leaching kinetics was discussed with the experimental data obtained in this investigation. It was found that more than 98 percent of the lead was extracted from the galena which was treated with ferric chloride solution of 3 to 1 mole ratio of FeCl₃/PbS at 100℃. At 50℃, more than 99 percent of the lead was obtained from the galena leached with the solution contained with 3 to 1 mole ratio of FeCl₃/PbS and 3 mole NaCl. While, at room temperature, over 99 percent of the lead was extracted from the galena leached with the solution mixed with 3 to 1 mole ratio of FeCl₃/PbS, 3 mole NaCl and 2 mole of CaCl₂. The rate equation for the leaching of galena was shown to be in a good agreement with 1- (2/3)R-(1-R)^⅔=K`t. |
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