| Abstract Scope |
In this study, we develop a selective precipitation process for the recovery of titanium, magnesium, and aluminum from steel slag leach liquor. To accurately predict the precipitation behavior of the target elements in the complex sulfate system, we conduct thermodynamic modeling and experimental measurement of metal hydroxide precipitation titration curves. The investigation focuses on three key operating parameters: initial solution pH, initial metal ion concentration, and reaction temperature. We examine the ion interaction, precipitation pH, amount of precipitant required, and species equilibrium. Subsequently, hydroxide precipitation testing is performed using sodium hydroxide as a single precipitant to selectively recover the target elements. We evaluate the effects of precipitation pH level, reaction temperature, stabilization time, and precipitant reagent type on metal recovery and product purity. Following process optimization, we achieve an 83% purity of titanium precipitate with 85% recovery, along with >90% purity of magnesium and aluminum precipitates with 100% recovery. |