Copper Recovery from Chalcopyrite Concentrate by Oxidative Roasting and Acid Leaching

In this study, a combined process consisting of salt roasting and acid leaching was conducted to recover copper per sulphide concentrate with 43.5% chalcopyrite. The chalcopyrite roasted in the absence presence potassium chloride (mass ratio concentrate:KCl from 1:0.5 1:0.9) at various temperatures (400-600°C) different times (1-4 hours) under air atmosphere. dissolved sulphuric solution (60 g/L) solid-liquid 1:8 an ambient temperature for 2 hours. concentrate, samples, leached residues were analyzed using atomic absorption spectrometry, UV-VIS spectrophotometer, X-ray diffractometer. Thermogravimetry differential thermal analyses applied on KCl up 1000°C. Results showed that about 80% 90% decomposed conditions 1:0.6, time hours 500°C 550°C, respectively. DTA-TG revealed variant phase regions associated decomposition through roasting. Copper dissolution concentrates over 99.7% 99.0% determined conditions. thermodynamic stability discussed by calculating Gibb's free energy.