Abstract
The paper presents the results of investigation of the process of leaching of scandium from chloride wastes generated in titanium production to optimize the parameters of extraction into solution. The effects of key factors, including solid-to-liquid ratio (S:L), hydrochloric acid (HCl) concentration, process duration, stirring speed and the influence of temperature on the degree of scandium extraction into solution were studied. Experimental results indicate that optimal conditions for maximum extraction are: S:L ratio=1:10, HCl concentration = 0.12 percent (pH=1.47), temperature (80 to 90 degrees Celsius), duration =60 minutes, and stirring speed =300 rpm. It is shown that increasing the HCl concentration to 3 percent further enhances scandium recovery to 97.2 percent, corresponding to a pH = -0.82. A comprehensive kinetic analysis was performed by fitting the experimental data with the exponential kinetic equation, Yander diffusion equation, Drozdov-Rotinian equation and Prout-Tompkins equation. The findings contribute to the development of an efficient scandium recovery technology, reducing the environmental impact and enabling the secondary utilization of the valuable component.