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Simple process for lithium extraction from α-spodumene with potassium fluoride: Modeling and optimization

2023; Elsevier BV; Volume: 191; Linguagem: Inglês

10.1016/j.cherd.2023.01.042

1876-4800

Gustavo D. Rosales, Alexander C. Resentera, Paulo Fernando Almeida Braga, M.R. Esquivel, Mario H. Rodriguez,

Advancements in Battery Materials

New developments in energy storage technologies have positioned lithium as a critical energy element worldwide. For this reason, it is relevant to investigate new processes that exploit Li resources comprehensively and efficiently. This work describes a simple methodology for Li extraction by solid-solid reaction between α-spodumene and KF and subsequent leaching. The operational parameters investigated were: temperature, calcination time, and amount of fluorinating agent. The process efficiency was analyzed through Design of Experiments (DOE) and Artificial Neural Networks (ANN) to obtain a predictive model of the system. Optimal Li extraction of 94% was achieved at 779 °C, 43 min, with a KF/spodumene ratio of 0.56 w/w.