The Effect of Leaching Duration and Solid/Liquid Ratio on Lithium Extraction from Mica Schist Used Hydrochloric Acid Process

Abstract

Lithium demand has increased rapidly in the last few years because lithium is a metal that is important in technology, like electronic equipment and electric vehicles. One of the primary lithium resources is lithium ore, which contains minerals such as spodumene and lepidolite. Mica schist is one of the lithium ore sources that is indicated to contain lithium. The mica schist used in this research was from Kebumen, Central Java, Indonesia. This raw material indicates a lithium mineral called lepidolite. The aims of this research were to find out the potential of local Indonesian minerals as raw materials for lithium extraction processes in lithium-ion battery (LiB) applications, with the effect of leaching time and solid/liquid ratio. The leaching agent used in this research was 2 M chloride acid (HCl). Variables of this research were-100 mesh for particle size of raw material, 1:5, 1:10, 1:15, and 1:20 (g/ml) for solid/liquid ratio, 30, 60, 90, and 120 minutes for leaching time, and 70 °C for leaching temperature. Inductively Coupled Plasma (ICP-OES) analysis was done on this research to determine the mica-schist composition. The optimum lithium percentage that was obtained in this research was 40.65% on a solid/liquid ratio of 1:5 (g/ml) and a leaching time of 120 minutes.