فهرست نشریات علمی دسترسی آزاد ایران

The flue dust of flash smelting furnace at Sarcheshmeh copper complex includes high concentration of copper (26.7 wt%). In this research, the effect of various parameters in hydrometallurgical treatment of the flue dust was investigated. In this regard, the leaching efficiency was studied by looking into the key factors that influence the copper dissolution as temperature, solid to liquid ratio, sulfuric acid (H2SO4) concentration and the addition of oxidizing agents. Increasing the temperature from 30°C to 80°C improved the copper recovery from 44% to 58%. Decreasing the solid to liquid ratio from 30% to 15% increased the copper recovery from 5% to 30%, but decreased the copper concentration in the Pregnant Leach Solution (PLS) from 51 g/l to 12.5 g/L. Increasing the H2SO4 concentration from 50 g/l to 190 g/l can improve the copper recovery from 48% to 64%. Kinetics studies showed a two-step mechanism was carried out for the duration of 600-minute leaching tests at 40°C, 55°C, and 70°C. In the first thirty minutes, the kinetics were controlled by liquid film diffusion, with an activation energy of 3.6 kJ/mol. In the second stage (60-600 minutes), the mechanism was controlled by the product layer diffusion, with an activation energy of 20.6 kJ/mol. The efficiency increased from 45% to 97% with the addition of H2O2 from 0 to 1M. The two-step leaching process combined with the use of an oxidizing agent resulted in the highest leaching yield of 94% efficiency.