پويا رمضاني قراخيل

This study investigates the removal of magnesium from sulfate electrolyte solutions using the process of freeze crystallization. Magnesium is one of the significant impurities in the zinc production process, which greatly impacts the quality of the final product. The main objective of this research is to optimize the magnesium removal process an‎d enhance the crystallization yield using freeze crystallization as an alternative, sustainable, an‎d cost-effective method. In this study, the effects of four main parameters, including sulfuric acid concentration, seed crystal amount, time, an‎d temperature, on the magnesium removal process were investigated. The results showed that a sulfuric acid concentration of approximately 120 g/L in laboratory conditions an‎d no acid in industrial conditions, along with a seed crystal amount of 10 g/L, were identified as the optimal conditions for magnesium removal. Additionally, the optimal process time for achieving maximum magnesium removal was approximately 3 hours. Furthermore, the effects of temperature revealed that lower temperatures, around -10°C, promoted more uniform crystal growth an‎d, ultimately, improved magnesium removal efficiency. This study also demonstrated that freeze crystallization could serve as an effective an‎d green method for magnesium removal in zinc production industries, with minimal use of chemicals an‎d low costs. The results showed that the magnesium concentration in the solution decreased from approximately 25.1 g/L to 12.3 g/L, an‎d the zinc concentration in the solution decreased from approximately 33 g/L to 26 g/L, which is economically significant. The findings of this study can be beneficial in optimizing industrial processes an‎d reducing costs in zinc production, particularly in hydrometallurgical plants. Finally, recommendations for future research in this field were provided, including the use of advanced equipment for more precise temperature control an‎d examining the long-term effects of the process.

تبلور انجمادي , حذف منيزيم , سولفات روي , بذر كريستال

Freeze Crystallization , Magnesium Removal , Zinc Sulfate , Crystal Seed

Pouya Ramezani

Ahad Ghaemi