(c) Effect of leaching time
The effect of leaching time on the recovery of Al is displayed in
Fig. 4. For different concentration of HCl, the recovery of Al rises
with reaction time. At lower concentration (1.3 mol L1), the recovery
of Al increases by 50% when leaching time raises from 2 h to
6 h. In the case of 2.5 mol L1 HCl, the recovery is up to 100% after
leaching for 5 h, and thus Al is dissolved completely and separated
with PVC. Leaching time of 4 h was selected for further
experiments.