. Extraction equilibrium of sulfuric acid
The extraction experiments were carried out by varying the
concentrations of the sulfuric acid free from Fe(III) at 25 ◦C under
ambient pressure. The organic and aqueous solutions were agitated
at 600 r/min for 10 min to ensure the reactions reach the equilibriums.
The relationships of the reactions are addressed in Fig. 4.
Based on Fig. 4, the following equilibrium constants are
obtained: