|About this Abstract
||Part C-3: Processing of Critical Metals
||M-21: Challenges with the Use of Lime and Limestone for Impurity Removal in Rare Earth Elements Hydrometallurgical Treatment; A Fundamental Look
||Farzaneh Sadri, Ahmad Ghahreman
|On-Site Speaker (Planned)
Lime neutralization has a high efficiency in removal of dissolved heavy metals from the solution. After water leaching of the REE acid baked concentrate, different chemicals can be used to remove impurities from the solution, among which lime and limestone are the cheapest options. Although the application of lime and limestone to the impurity removal stage in hydrometallurgical treatment of REE ores could reduce the costs of operation, they are not widely in use; A proportion of REE is lost to gypsum while removing other impurities. An insight into the role of REE on the crystal morphology of gypsum is essential for a better fundamental understanding of the cation-assisted crystallization of calcium sulfate dihydrate. It is the scope of this poster to investigate the mechanism of the REE-loss in the said process and REE dopants effect on the crystallization of dihydrate in a Ca(OH)2–H2SO4 system.
||Planned: At-meeting proceedings