Extraction of Rare-Earth Elements from Silicate-Based Ore through Hydrometallurgical Route

The European Union and several countries/regions classified the rare-earth elements (REEs), such as lanthanum, cerium, neodymium, scandium, critical due to risk of supply interruption. For this reason, growing demand for REEs has resulted in forgotten reserves receiving economic interest. So, search new sources development chemical process is important, silicate-based ore. Since there almost no literature on extraction from source, a approach was developed present study. Direct leaching acid baking were studied using sulfuric acid. effect concentration, temperature, solid-liquid ratio, oxidizing/reducing medium, dosage studied. Results showed that achieved up 80% at 90 °C oxidizing scandium iron 13.5% 65.0%, respectively. experiments, results better than direct over 85%. rate lower leaching. On other hand, rates higher temperatures (<200 °C) dosages, achieving 50% 6.3%, Future studies should explore thermal treatment before