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Density separation of waste plastics

This is the use of different plastics have different densities they are classified separate ways, there are standing separation and spin-liquid separation in two ways.
 1 stand for the separation of plastics with different densities of the liquid density in the ups and downs of a particular feature, so that separation. Plastic Enclosure This method is simple, you can simply select the appropriate separation medium for density separation gap between the larger species, but similar to those of the density separation is difficult to obtain high purity isolates. Commonly used separation medium with water, saturated salt solution, 58.4% alcohol solution, 55.4% alcohol solution and calcium chloride aqueous solution and so on.
 However, when water for density separation medium, because of the plastic surface activity at the beginning and different, some will float on the water with air bubbles, affect separation. At this point, you need surfactants for pretreatment, so that the full invasion. For example, from polypropylene, low density polyethylene, high density polyethylene, polystyrene, polyvinyl chloride composition of mixed plastic, the separation steps: First, a small amount of surfactant containing water greater than the density polyethylene 1G/CM3 styrene and polyvinyl chloride (sink) with density less than 1G/CM3 low-density polyethylene, high density polyethylene and polypropylene (floating) separation; after the salt solution to make use of polystyrene (floating) and polyvinyl chloride (Shen) separately; different densities of alcohol solution and then gradually low-density polyethylene, high density polyethylene and polypropylene separation of the three.Hand-held Enclosure
 2 spin-liquid separation using hydrocyclones and drifting methods are effective in the density is greater than and less than 1G/CM3 plastic separation. However, the thickness preferably greater than 3CMM, the density difference 0.5G/CM3 about, such as polypropylene and polyvinyl chloride separation, a separation rate of 99.9%. If you use flat separator, detachable density greater than 1G/CM3 various plastics. Multi-stage separation better.
 Hydrocyclone separation step: the moral will waste plastic crushing, and cleaning and pretreatment, the inhaled material in the storage hopper worse, waste in the tank evenly distributed, and with constant speed centrifugal pump to quantitatively into the hydrocyclone . Density of plastic discharged from the upper part of the collection, can be dehydrated by the shaker. Separation of water can be recycled.
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