Parameters Affecting the Precipitation of Al Phases from Aluminate Solutions of the Pedersen Process: The Effect of Carbonate Content

Abstract Leaching experiments were performed in calcium aluminate slag with a high-sodium carbonate adaptation of the Pedersen process. A theoretical thermodynamic study pregnant leaching solution was conducted to specify thermodynamically favored species that exist within. Using HSC 9.0 software, carbonation process simulation (neutralization CO 2 gas) simulated. Laboratory verify predictions. According study, at temperatures below 50 °C gibbsite precipitates first stages and then is transformed dawsonite. Temperatures over 65 favor direct precipitation The same route (thermodynamic analysis, simulation, experimental verification) followed by synthetic containing lower amount sodium prove dawsonite occurred as result high free content, investigate effect temperature precipitate alumina hydrate phases. Graphical