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Separation of mixed plastics for recycling involves successive flotation in water with pulsating air injection in a series of vessels
Separation of mixed plastics for recycling involves successive flotation in water with pulsating air injection in a series of vessels
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机译:分离混合塑料以进行回收利用涉及在一系列容器中在水中连续浮选并脉动空气喷射
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摘要
A mixture of different plastic materials is fed (1) to a flotation vessel (2) containing water, which is being agitated, e.g. by pulsating air (10). The heavier fraction sinks to a grid (16) from where it is transferred through a rotary lock (8) by an elevator (26) to a container (13). The suspension containing the lighter materials is passed to a succeeding vessel (2') where conditions are adjusted to separate the next lighter fraction. Separating conditions are set by a controller (17) that alters the slope of the grid (16) and the angle of the flaps (6) according to signals obtained from sensors (5). Pulsation in the liquid is preferably generated by compressed air through a bell-shaped distributor (11), but can also be generated by hydraulic, pneumatic, mechanical or electrical vibrators. The frequency and intensity of the pulsation are controlled to generate the required flotation effect with different densities in successive vessels.
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