مهشيد حجه جلالي

Gold ores containing copper are found in many countries, but the cyanidation method for extracting gold and copper is inefficient due to the high reagent consumption caused by the presence of copper minerals and the reduced rate of gold dissolution. Additionally, the use of cyanide is restricted due to its toxicity and environmental concerns. As a result, the need to find alternatives to cyanide has become apparent. Glycine, an environmentally safe reagent that forms stable complexes with gold and copper, has attracted significant attention due to its high efficiency and selectivity. This research investigates the process of extracting gold and copper from gold-copper ores in alkaline environments using glycine. In this study, optimal leaching parameters for extracting gold were eva‎luated using the experimental design method. The parameters examined included glycine concentration (0.5 to 2 molar), pH (10.4 to 12), temperature (23 to 60°C), with a fixed leaching time (24 hours) and a solid-to-liquid ratio of 100 grams per liter. Based on the experimental results, a mathematical equation was developed using software to predict gold extraction. This equation showed that, within the studied parameter range, glycine concentration did not significantly affect gold extraction. Instead, temperature and pH both played important roles in leaching kinetics. Maximum gold extraction was achieved at a glycine concentration of 1.71 molar, a temperature of 60°C, and a pH of 11.61, with the highest gold extraction reaching 92% after 24 hours. Additionally, copper extraction was also examined under the optimal conditions suggested for gold leaching, with the highest copper extraction reaching 92.21% after five experimental repetitions. This research demonstrates that glycine can be an effective alternative to cyanide in metal extraction from gold-copper ores and can help overcome the limitations of traditional methods.

ليچينگ , كانسنگ طلا- مس , استخراج , غلظت گلايسين

Leaching , Gold-Copper Ore , Extraction , Glycine Concentration

Mahshid hojatjalali

Professor Mansoor Anbia