Document Type : Original Research Paper
Authors
Department of Petroleum and Mining, Faculty of Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran
Abstract
In this research, the leaching of REEs from the tailing of the apatite-iron ore processing unit of Morvarid mine (NW Iran), has been investigated using nitric, hydrochloric and sulfuric acids. This tailing contains rare earth elements (REEs) specifically Ce, La, Nd, Y and its accompanying minerals are magnetite, apatite, monazite, hematite, quartz. The appropriate dimensions for apatite release are 80-75μm. Leaching tests were performed for all three acids, and digestion process was also used for sulfuric acid. The leaching in the presence of sulfuric acid, under a temperature of 90°C, an acid concentration of 40% and a time of 60 minutes, leads to the total recovery of REE equal to 40.23%, and in acid sulfuric acid digestion at 200°C, equal to 61.21%. became. The recovery of REE when using hydrochloric acid at 72.64°C, concentration of hydrochloric acid 36.21% and time 56.28 minutes, was equal to 60.57%. In the presence of nitric acid, under the optimal conditions of temperature 61.51°C, acid concentration 40% and time 72.92 minutes. Furthermore, the maximum recovery of total REE equal to 51.9% was obtained. Due to the higher recovery and the lower price of sulfuric acid, this method is suggested for extracting for the extraction of REEs from the tailings.
Keywords
Main Subjects
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