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

Abstract

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 (K_d) is lower at 200°С than at 150°С in the region of high m_HF concentrations. Quartz solubility in the vapor phase HF–H₂O as compared to the pure water vapor at 0.1 m_HF increases by more than four orders of magnitude and approaches quartz solubility in liquid water.