Lithium Processing Reactor: Leaching, Precipitation and Cathode Precursor Design What is a lithium processing reactor? A lithium processing reactor is a vessel in which lithium-bearing ore or brine is converted into a saleable lithium compound, and it appears at three distinct points in the value chain: ore leaching after roasting, where spodumene is digested at 200-265°C; lithium carbonate or hydroxide precipitation and crystallisation at 90-100°C; and cathode precursor