APPLICATION OF THE PITZER-MODEL TO SOLAR SALT BRINE CHEMISTRY

A series of liqiud samples from the Seca solar saltwork was collected and analyzed for the major ions along with Adriatic seawater. The most concentrated saltwork. brine was further evaporated in the laboratory . These samples provided a set of solutions ranging from 0.7 to 13.6 i onic strength (in molality), from which various solid phases precipita ted during the evaporation. A Fitter model for ionic activity coeffici ents was used to calculate the ion activity products of various phases in these solutions. The composition of the evaporation brines was con trolled by the Ks of gypsum, anhydrite, halite, epsomite, and possibly astrakhainite over various ionic strength ranges.