Levantamento de parâmetros ótimos para extração metalúrgica do cobre oxidado por lixiviação em coluna com leitos fixos

Abstract

In order to define the optimum parameters for hydrometallurgical extraction by leaching columns with fixed beds of oxidized copper ore coming from the mine's Quiet, some bench tests were performed. To tailor the concentration used sulfuric acid (H2SO4) as leaching agent, varied in different concentrations (1%, 5%, 8%, 10%, 12% and 15%). Following is sought from the following liquid-solid ratios: 0.25 / 1; 0.5 / 1; 0.8 / 1; 1/1; 1.5 / 1; 2/1; 2.5 / 1 and 3/1, which presented the best metallurgical recoveries in the extraction of oxidized copper. Then assays which determined the saturation time of the liquor as a function of copper was performed. Time of 5 min, 15 min, 30 min, 60 min, 120 min, 180 min, 240 min and 300 min were established. The tests were finished with the plot of the isotherm extraction, and determined the minimum number of stages required for the depletion of metal in the ore sample. 8% concentration, liquid-solid ratio 0.8 / 1 residence time of 120 minutes and required number of the above four equal stages: At the end of the laboratory tests the following parameters were determined.