Influência da porosidade no controle da cinética de extração do cobre oxidado em colunas com leito fixo

Abstract

Copper is a metal whose characteristics give you some superiority in many applications compared to similar or potential substitute materials. The copper ore is found in nature in two geological classifications: Rusty, more surface water in the crust and lower content, and sulfide, which occurs in deeper layers and has higher content. Currently oxidized copper ore from the Quiet of Canaan Pa-mine is being stored, for lack of technologies that need for their economic improvement. In an attempt to improve the concentration of the ore process was held, in this work, the leaching of oxidized copper cluster with sulfuric acid in columns with fixed bed, with control of the residence time between the liquid and the solid, so that if understand the behavior of porosity. Thus, we investigated the influence of porosity in controlling the kinetics of extraction of oxidized copper. After the experiments, a kinetic model that predicts the behavior of the concentration on the extraction of copper as a function of time and considering the variation of the porosity was proposed. Comparisons with results of previous studies were conducted and it was found that the curves generated by the model not fit the curves for practical results.