Fig. 4. The flotation kinetics of the PVC particles from a mixture
containing 10 wt% PVC (pine oil bottle) and 90 wt% PET
(soft-drink bottle) at different temperatures. The mixture of
plastics was treated with a 2 wt% NaOH solution at 75-80°C
for 30min, washed with water, and then conditioned with a
540 mg/l solution (75580°C) of diisodecyl phthalate plasticizer
for 30 min before flotation. The flotation experiments were
done in a 2 1 Denver flotation cell (1300 rpm) using 15-20 mg/l
Rhodasurf 91-6 surfactant solution (pH 8.0-8.3). The concentration
of solids in the flotation cell was about 8.3 wt%.