Mixed plastic separating method
A technology of mixing plastics and separation methods, which is applied in the field of waste plastic recycling, can solve problems such as secondary pollution, increased costs, lack of efficient, cheap, and environmentally friendly plastic surface treatment methods, and achieve high-efficiency separation effects
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Embodiment 1
[0037] Wash, crush, and sieve polystyrene and polyvinyl chloride mixed plastics to obtain 1.0-2.0 mm plastic particles, add 100 g of plastic particles, 10 g of zero-valent iron catalyst, 10 g of ascorbic acid and 10 g of hydrogen peroxide with a mass concentration of 30% into the In 1000mL of water, the stirring rate is 300rpm, stirring for 20min, and then the zero-valent iron catalyst is separated from the aqueous solution by an external magnetic field, and the plastic particles after catalytic oxidation in the aqueous solution are flotationd. The flotation conditions are terpineol oil 5g / t, After flotation for 2 minutes, the purity of polystyrene and polyvinyl chloride after separation were 96.32% and 98.77%, and the recoveries were 98.75% and 96.44%, respectively.
Embodiment 2
[0039] Polycarbonate and polyvinyl chloride mixed plastics were cleaned, crushed, and sieved to obtain 2.0-3.0mm plastic particles, 500g of plastic particles, 100g of sepiolite catalyst loaded with manganese ferrite, 200g of hydroxylamine hydrochloride and a mass concentration of Add 200g of 30% hydrogen peroxide into 1000mL water, stir at 1000rpm, stir for 5min, then separate the sepiolite catalyst loaded with manganese ferrite from the aqueous solution through an external magnetic field, and float the plastic particles after catalytic oxidation in the aqueous solution. The flotation conditions were dimethyl phthalate 20g / t, flotation 20min, the purity of polycarbonate and polyvinyl chloride after separation were 95.43% and 99.24%, and the recovery rates were 98.86% and 97.62%, respectively.
Embodiment 3
[0041] Wash, crush and sieve the mixed plastics of polycarbonate and polystyrene to obtain 0.8-1.5mm plastic granules, 200g of plastic granules, 50g of cobalt ferrite catalyst, 60g of gallic acid and 80g of hydrogen peroxide with a mass concentration of 30% Add it into 1000mL water, stir at 300rpm, stir for 300min, then separate the cobalt ferrite catalyst from the aqueous solution through an external magnetic field, and perform flotation on the plastic particles after catalytic oxidation in the aqueous solution. The flotation condition is methyl isobutyl Base methanol 15g / t, flotation for 10min, the purity of polycarbonate and polystyrene after separation were 97.35% and 98.88%, and the recoveries were 98.69% and 97.41%, respectively.
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