LEACHING OF GOLD FROM OXIDIZED GOLD ORES USING GLYCINE

This study investigated the process of gold extraction from oxidized gold ore, leveraging the selective dissolution property of glycine for precious metals. Glycine, a non-toxic and simple amino acid, is of significant interest for its potential use in gold extraction. The study utilized glycine solutions at concentrations of 1-3 M, with reaction times ranging from 4 to 60 hours. Throughout the process, the pH was maintained at 11-12, the reactor temperature was set to 60 °C, the stirring speed was 350 rpm, and the air flow was 1 L/min. The average particle size of the oxidized ore was 70.7 μm. The results of the study indicated that the highest gold recovery rate of 81.41% was achieved after 48 hours in a 3 M glycine solution. Silver solubility was moderate at 44.50%, while iron exhibited low solubility at 7.71%. Furthermore, it was determined that extending the reaction time and increasing the glycine concentration promoted greater gold extraction from the oxidized ore.