Quartz Solubility in the Vapor Phase of the H2O–HF System at 200°С and Saturated Vapor Pressure: Experimental Data

Abstract—This work was carried out to elucidate the silica transport in the presence of fluorine at the low-temperature hydrothermal stage. The liquid-vapor distribution of fluorine in the HF–H2O system under saturated vapor pressure at 150 and 200°С as well as the dissolution of quartz in the vapor phase of the same system at 200°С and under saturated vapor pressure were studied. It is established that fluorine at 150–200°С is mainly partitioned in a a liquid phase, while its liquid/vapor distribution coefficient (Kd) is lower at 200°С than at 150°С in the region of high mHF concentrations. Quartz solubility in the vapor phase HF–H2O as compared to the pure water vapor at 0.1 mHF increases by more than four orders of magnitude and approaches quartz solubility in liquid water.