The solubilities of La and Ni on LaNiO3 in Li/K carbonate eutectic with La2O3 have been investigated. The solubilities of La and Ni were 1.9 x 10(-2) (mole fraction) and 1.2 x 10(-5) (mole fraction) under CO2/O-2 of 0.7/0.3 at 923K. The extraction of Ni from LaNiO3 in molten carbonate saturated with La2O3 was almost 57% lower than that from NiO in a molten carbonate without La2O3.