Process of separating mixed plastic waste into light and heavy plastic phases
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 1, 2000
Grant Date -
N/A
app pub date -
May 6, 1998
filing date -
May 9, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
According to the present invention, plastic waste mixture is first comminuted, and if required, subjected to magnetic separation and/or eddy-current separation, by which separable metals are removed. The comminuted plastic waste mixture is then mixed with a separation liquid in a mixing tank which has an outlet for heavy phase impurities. This suspension is directed to a hydrocyclone for a first separation procedure. The hydrocyclone is optimally adjusted in such a manner that any remaining unwanted heavy phase impurities together with the heavy phase undesirable plastics, such as the PVC fraction of the plastic waste mixture, is separated from the balance of the plastic waste materials as hydrocyclone underflow. The heavy underflow of the mixing tank and the hydrocyclone underflow may be further reprocessed separately or jointly. The hydrocyclone overflow now directly reaches a sorting centrifuge in which the remaining plastic waste mixture is subjected to further separation under the effect of centrifugal forces. The products discharged from that separating operation include a heavier phase plastic which can be well utilized for feedstock recycling, e.g. in a blast furnace and a fraction of light plastic waste (PO) which can be utilized for material recycling.
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