چكيده به لاتين
This thesis investigates the feasibility of copper extraction from the Copper oxidized ore of the Mahdiabad deposit using acid leaching and solvent extraction (SX). Initially, the identification of the existing minerals was performed through XRF and XRD analyses to quantitatively and qualitatively evaluate the representative sample. During the leaching process, key operational parameters such as sulfuric acid concentration, stirring speed, liquid-to-solid ratio, temperature and process time were optimized using a one-factor-at-a-time approach. Optimal conditions, including a 20% sulfuric acid concentration by volume, a liquid-to-solid ratio of 12.5 mL/g, a stirring speed of 500 rpm, a temperature of 65°C and a leaching time of 90 minutes, yielded a maximum copper recovery rate of 86.41%.
Subsequently, solvent extraction was conducted using the industrial solvent Mextral 5640H. The results revealed that the highest copper extraction efficiency, 96.65%, was achieved under optimal conditions, which included a 15% solvent concentration by volume, a pH of 2.5, a stirring speed of 500 rpm, a temperature of 25°C and a contact time of 20 minutes. Additionally, 99.44% of the copper loaded onto the organic phase was successfully stripped using 15% sulfuric acid within 20 minutes.
To incorporate environmentally friendly solvents into the solvent extraction process, a deep eutectic solvent (DES) based on a terpenoid compound (linalool) and a carboxylic acid (octanoic acid) was synthesized. The formation of this DES was confirmed through IR and NMR spectroscopy. The parameters influencing copper extraction using the DES were optimized, achieving nearly 100% copper recovery under the following conditions: a pH of 5, a copper concentration of 0.02 M, a temperature of 25°C, a stirring speed of 4000 rpm, a linalool-to-octanoic acid ratio of 1:2, a contact time of 10 minutes and the presence of 0.1 M sodium acetate. To ensure the stability and performance of the DES, hydrophobicity, selectivity, recovery cycles and viscosity were examined.
