Abstract:In view of the cost and environmental pressure existing in the current beryllium ore dissociation, the subject focuses on the basic theory of beryllium industry and uses hydrofluoric acid as the dissociation medium to obtain beryllium fluoride by direct dissociation of beryllium ore. The leaching thermodynamics of different oxide impurities during the dissociation of beryllium ore in hydrofluoric acid system was studied, with emphasis on the selective leaching principle of SiO2 from beryllium ore. The results show that multiple complex oxides closely related to beryllium ore and oxide impurities of different valence states can react with hydrofluoric acid, but the required thermodynamic conditions are different. Different oxide impurities are converted into fluorides after reacting with hydrofluoric acid, and fluorides are used as reaction products, which can be further removed by the difference in solubility. SiO2 is the most important part to reduce the consumption of hydrofluoric acid. By adjusting the solution temperature, HF concentration and artificially adding fluorosilicic acid, the reaction between SiO2 and hydrofluoric acid in beryllium ore can be inhibited.