Solubility of Li2WO4 under hydrothermal conditions

Experimental studies of water solubilities of Li₂WO₄ at temperatures up to 450°C and pressures up to 147 MPa show that this salts with water forms a type 2 binary system, where the solubility of the salt under the vapor pressure decreases as temperature rises to end at the critical end-point p (g=l-s) near the H₂O critical temperature. High-temperature Li₂WO₄ solutions are shown to not react with silica, but they cause corrosion of metallic walls of an autoclave accompanied with gas evolution and formation of dark-colored solid corrosion products.