The flotation experiments were conducted in a
2 1 Denver flotation cell at a rotational speed of
about 1300 rpm. The 150-250 g of the plastic
sample (promptly treated with the alkaline solution,
rinsed, and conditioned with the plasticizer
solution) was mixed with 1.8 1 of tap water,
Rhodasurf 91-6 surfactant (C9- 11 ethoxylated
alcohols) received from Rhone-Poulenc was used
as a frother at a concentration of 15-30 mg/l, in
all flotation experiments. The pH of the solution
was measured with a pH meter. In selected experiments
the pH of the solution was adjusted to a
desired level using l-5 M NaOH solutions. The
suspension of plastics was conditioned with the
frother for about 2 min before the flotation experiments.
The froth floated PVC product was collected
over 8 min, screened, rinsed with water, and
dried.
The flotation experiments were conducted in a2 1 Denver flotation cell at a rotational speed ofabout 1300 rpm. The 150-250 g of the plasticsample (promptly treated with the alkaline solution,rinsed, and conditioned with the plasticizersolution) was mixed with 1.8 1 of tap water,Rhodasurf 91-6 surfactant (C9- 11 ethoxylatedalcohols) received from Rhone-Poulenc was usedas a frother at a concentration of 15-30 mg/l, inall flotation experiments. The pH of the solutionwas measured with a pH meter. In selected experimentsthe pH of the solution was adjusted to adesired level using l-5 M NaOH solutions. Thesuspension of plastics was conditioned with thefrother for about 2 min before the flotation experiments.The froth floated PVC product was collectedover 8 min, screened, rinsed with water, anddried.
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