Liquid immiscibility in the system NaF-H2O and microlite solubility at 800A degrees C

摘要

The NaF effect on microlite solubility at 800A degrees C and 170, 200, and 230 MPa is studied experimentally. The immiscibility boundaries and compositions of fluid phases L-1 and L-2 are defined in the system NaF-H2O at 800A degrees C. It is established that microlite solubility increase in the L-1 phase, as compared with a homogeneous solution, is explained by the appearance in the L-1 phase of "free" HF in an amount of 0.025 +/- 0.003 mol kg(-1) H2O. The model of "acidification" L-1 and "alkalizing" L-2 is supposed.