Optimization of Chalcopyrite Galvanic Leaching in the Presence of Pyrite and Silver as Catalysts by Using Response Surface Methodology (Rsm)

Abstract

In this research, dissolution of chalcopyrite concentrate is modelled and optimized using Response Surface Methodology (RSM). Also, effective parameters in the leaching process such as the amount of pyrite, silver ions, redox potential and initial concentration of acid are comprehensively studied. Central Composite Design (CCD) methodology is chosen as the design matrix to predict the optimum level of the parameters. In the next step, it will be proven that in the presence of silver ions, pyrite effectiveness is improved and also the chalcopyrite dissolution rate is increased considerably. Using the result of quadratic programming, a rotation speed of 1000 rpm, a pyrite/chalcopyrite mass ratio of 3:1, the amount of 150 ppm silver ion, a solution potential set point of 470 mV, at 800°C and 25 g/L initial acid concentration are the optimal level of the selected parameters wherein the maximum copper extraction with more than 95% in less than 10 hours can be accessible.

Investigation of chalcopyrite removal from low-grade molybdenite using response surface methodology and its effect on molybdenum trioxide morphology by roasting

“…Hence, to obtain the most efficient conditions for copper removal, optimization of the leaching process was determined by Central Composite Design (CCD). [46][47][48][49] In the leaching process, three important factors affect copper removal and consequently the catalytic properties of molybdenite; the molarity of nitric acid, the temperature, and the leaching time.…”

The Effects of Chloride on the High Temperature Pressure Oxidation of Chalcopyrite: Some Insights from Batch Tests—Part 2: Leach Residue Mineralogy

“…The galvanic effect of pyrite upon the leaching of chalcopyrite is well documented [100], although based upon this and subsequent studies, e.g., [101,102], the presence of catalysts such as Ag + ions can further enhance this effect. A recent study, however, suggests galvanic contact with pyrite only marginally increases the rate of chalcopyrite dissolution at 30 • C, and this is insufficient to explain the large increases reported at higher temperatures [103].…”