Tohoku Univ. Technology ：Lithium Extraction from Ore：T25-062

Low-Temp Process for Simultaneous Li Extraction, Energy Production and Decarbonization

EVs and renewable energy are driving a surge in lithium (Li) demand. Li is mainly produced either by concentrating brines from salt lakes or by extracting it from ores, primarily α-spodumene. Brine evaporation requires vast land, long processing times, and favorable climatic conditions. Ore processing requires roasting above 1000 ℃, followed by intensive sulfuric acid leaching, leading to high energy and chemical consumption. Moreover, the co-dissolution of Si and Al impurities complicates downstream purification, increasing both economic and environmental costs. The inventors developed a hydrothermal process that controls element behavior, enabling simultaneous Li recovery, hydrogen (H2) production, and CO2 mineralization at relatively low temperatures. For example, a NaHCO3 solution with olivine enables efficient and sustained Li extraction from α-spodumene at 300 ℃. Impurities such as Si and Al are immobilized as secondary minerals, simplifying purification. Meanwhile, Fe(II) and Mg in olivine contributed to concurrent H2 generate and CO2 mineralization.

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