Flotation of mixed plastics from municipal solid wastes.
Hood GD; Susko FJ; Jordan CE
Advances in filtration and separation technology, separation problems & the environment, annual meeting of the American Filtration Society, October 20-23, 1991, Atlanta, Georgia. Scheiner BJ, ed. Des Plaines, IL: Cahners Publishing Company, 1992 Jan; 5:29-40
The U.S. Bureau of Mines used a combination brine separation and flotation process to obtain high-purity polystyrene (ps) and polyethylene terepthalate (pet) products from mixed plastics. The best overall process sequence for the low-pet feed was na2co3 brine separation of the ps, followed by flotation of pet from the mixture of pet and polyvinyl chloride (pvc). The na2co3 brine separation produced a 99.7-Pct-ps concentrate that recovered 98 pct of the ps. After three wash cycles, 53 pct of the pet was recovered in a 99.7- pct pet flotation concentrate. For the high-pet feed, both process sequences (brine separation-flotation, and flotation-brine separation) gave comparable results. In both processes over 98 pct of the ps was recovered in a 99.7-Pct-ps concentrate and 75 pct of the pet was recovered in a 99.7-Pct-pet concentrate. The pvc-rich flotation tailings could not be effectively treated to recover a clean pvc product.
OP; Conference/Symposia Proceedings
Advances in filtration and separation technology, separation problems & the environment, annual meeting of the American Filtration Society, October 20-23, 1991, Atlanta, Georgia