Acid dissolution of LiF/(NH4)3AlF6 mixtures obtained in the fluorination of α-spodumene with NH4HF2: Modeling and optimization.

Lithium is an essential element in the current energy paradigm shift. Therefore, Li extraction from mineral sources has become a scientific and technological priority. Industrially, the mineral α-spodumene is heated to 1100 °C to obtain phase β and then digested with concentrated sulfuric acid at 250 °C. As an alternative, the extraction of Li from α-spodumene with molten NH 4 HF 2 has been proposed as an efficient alternative method at low temperature (∼160 °C). However, the LiF obtained requires an acid leaching step to be solubilized and to separate the Li from other products. This research presents the modeling and optimization of the acid leaching operating parameters of the LiF/(NH 4) 3 AlF 6 mixture. This mixture was obtained by processing α-spodumene with NH 4 HF 2 at low temperatures. The solids were characterized by XRD, SEM/EDS, and the Rietveld method. The leaching operating parameters investigated were solid/liquid ratio, sulfuric acid concentration, and leaching time. (NH 4) 3 AlF 6 dissolution and Li extraction were analyzed and modeled separately using artificial neural networks and least squares, respectively. The optimization stage of the process leads to (NH 4) 3 AlF 6 dissolution of 99% and Li extractions of 93%, working with 6% (v/v) sulfuric acid solution and an S/L ratio of 30 g/L for 24 min [Display omitted] • The LiF/(NH 4) 3 AlF 6 mixture is obtained by processing spodumene with NH 4 HF 2. • The LiF/(NH 4) 3 AlF 6 dissolution is analyzed in an acid medium. • Predictive models for LiF and (NH 4) 3 AlF 6 dissolution are presented. • Leaching time, S/L ratio, and acid concentration are analyzed. • The optimal conditions tested led to Li extractions of 93%. [ABSTRACT FROM AUTHOR]