چكيده به لاتين
Gold is a well-established precious mineral, holding significant social and economic importance in human life. The large-scale production of gold results in the generation of substantial waste, which is dispersed into the environment. This thesis focuses on the processing of low-grade mine tailings originating from the Zareh Shuran gold mine, situated 42 kilometers from Takab in the West Azerbaijan province of Iran. Following sample collection by the Geological Survey and Mineral Exploration Organization of the country in the winter of 2022, the samples underwent processing studies at the Materials and Nanoprocessing Research Laboratory at Iran University of Science and Technology. Initial crushing, particle size analysis, assays, and microscopic studies were conducted. Mineralogical studies revealed that silica and oxides of calcium, aluminum, iron, quartz, and calcite are predominant mineral phases in the tailings, with a gold grade of 401 ppb. Leaching experiments were designed and executed using two amino acids and a leaching agent, glycine, and monosodium glutamate, for gold extraction. The results of gold leaching tests, along with their interpretation, were provided using the executive method. The optimum concentration for gold extraction was determined at pH=11 and 50°C for two amino acids, glycine, and glutamate, with a value of 2.5 g/mol. The highest extraction yield reached 94.92%, and for glutamate, it was 78.87%. Finally, based on the obtained results, the principles governing gold leaching were predicted, and several suggestions were proposed to optimize the pretreatment process. Based on the acquired results, recommendations have been formulated to optimize the pre-treatment process.
