(d) Effect of liquid/solid ratio
The effect of liquid/solid ratio on the separation of Al is displayed
in Fig. 5. At fixed conditions, the recovery of Al increases with liquid/solid ratio, which is responsible for that excessive HCl
accelerates the leaching reaction. The recovery of Al is 57.0% at
liquid/solid ratio of 5:1 and up to 98.0% at liquid/solid ratio of 15:1.
It is obvious that more energy is required to carry out the leaching
under high ratio. The liquid/solid ratio of 15:1 is sufficient to
separate Al and PVC in WPBs.