Leaching Behavior Of Copper Research Articles

Experimental and Kinetic Modeling Investigation of Copper Dissolution Process from an Iranian Mixed Oxide/Sulfide Copper Ore

In the present work, the leaching behavior of copper from an oxide/sulfide ore was assessed in two work phases including process optimization and kinetics modeling. In the first phase, the individual and synergistic impacts of the influential parameters such as sulfuric acid concentration, liquid/solid ratio, pulp mixing rate, temperature, and contact time were investigated on the dissolution rate of copper using response surface modeling. The findings demonstrated that the linear effects of dissolution time and temperature and the quadratic impact of acid concentration had the largest influence on the recovery and the linear impact of stirring speed had the least degree of importance. Process optimization was also performed utilizing the desirability function approach and more than 88.17% copper was recovered at the optimum conditions: ~ 17% acid concentration, ~ 11.3 mL/g liquid/solid ratio, ~ 390 rpm stirring speed, 50 °C temperature, and 60 min leaching time. In the second phase, the leaching kinetics was examined by heterogeneous shrinking core models and it was realized that diffusion through product layer was the dissolution rate controlling step with the activation energy of 28.92 kJ/mol and frequency factor of 6.155 min−1. Ultimately, a mathematical kinetics model was developed and suggested to understand the leaching process. a 3D response surface graphs displaying the synergistic effects between “temperature and liquid/solid ratio” and “stirring speed and leaching time” on the leaching recovery of copper; b the optimum conditions of influential factors; c plot of diffusion through product layer versus leaching time for temperature effect.

Investigating the Leaching Behavior of Copper from Chalcopyrite Concentrate in H2SO4/CuCl2 Media

Investigating the Leaching Behavior of Copper from Chalcopyrite Concentrate in H2SO4/CuCl2 Media

Investigation of Cu leaching from municipal solid waste incinerator bottom ash with a comprehensive approach

Municipal solid waste incinerator (MSWI) bottom ash is often reused as a secondary construction material. This study used a comprehensive approach to characterize the leaching behavior of copper (Cu) from the MSWI bottom ash. The batch titration procedure was used to determine the acid neutralizing capacity and Cu leaching as a function of pH. The sequential extraction procedure (SEP) was adopted to analyze the speciation of Cu in the MSWI bottom ash. The metal speciation equilibrium model for surface and ground water (Visual MINTEQ) was used to evaluate the equilibrium of the leachates with the relative minerals, and to determine the speciation of the aqueous Cu in the leachates. Based on the multi-analysis of the results, Cu would be significantly released from the MSWI bottom ash when it is acidic. The Cu leaching pattern was not only affected by dissolved organic carbon, it was also limited by its speciation in the MSWI bottom ash. Furthermore, almost 100% of the aqueous Cu in the leachate was bound to organic matter in basic and neutral conditions, but mostly existed as Cu2+ in an acidic condition. These findings provide an important insight into predicting the leaching behavior of Cu from the MSWI bottom ash, as well as its impact on the environment.