Component recovery process
View Patent ↗A component recovery process to recover one or more of the constituent components of a feed material. In one embodiment, the process is a carpet recycling process, the feed material being carpet, and the constituent components being fiber, filler and adhesive. The process can refine the polypropylene backing polymer and face fibers of post industrial edge trim selvage, whole carpet construction post industrial scraps and pieces, as well as whole carpet post consumer scraps and pieces and in particular mixtures there of. The process beneficially uses land filled edge trim and pre land filled selvage, whole carpet construction scraps and whole carpet post consumer scraps and mixtures there of for component purification.
1. A component recovery process comprising:
providing a material feed including fiber, filler and adhesive;
shredding the material feed to liberate filler and adhesive from the fiber;
screening the shredded material feed, yielding at least two resultant streams, wherein
a first resultant stream comprises fiber suitable for depolymerization feed stocks; and
a second resultant stream comprises filler suitable for direct reinforcement in polymer resins;
combining the first resultant stream with a liquid to form a slurry; and
centrifuging the slurry at a G-Force of 30 G or less.
2. The component recovery process according to claim 1 , further comprising drying the material feed prior to shredding, drying the material feed enhancing the liberation of filler and adhesive from the fiber.
3. The component recovery process according to claim 1 , further comprising the introduction of electrostatic ionization prior to screening, electrostatic ionization directionally reducing triboelectric cling forces between the adhesive and the fiber, enhancing the liberation of adhesive from the fiber.
4. The component recovery process according to claim 1 , the material feed comprising a mixture of edge trim selvage and whole carpet, the mixture providing for increased purification of the resultant streams.
5. The component recovery process according to claim 1 , the material feed comprising a mixture of fibers comprising nylon type 6 and type 6,6.
6. The component recovery process according to claim 1 , wherein the centrifuging step is configured to separate one material from another and wherein both materials have a density greater than the liquid in the slurry.
7. The component recovery process according to claim 1 , further comprising an auxiliary dryer bypass step comprising a friction style agglomeration densifier.
8. The component recovery process according to claim 1 , further comprising a filler product treating step, comprising the step of sanitizing a stream of the process comprising a majority of filler.
9. The component recovery process according to claim 1 , further comprising a positive polarity electrostatic polishing separation step to further separate fiber from filler/adhesive residue.
10. The component recovery process according to claim 1 , further comprising a negative polarity electrostatic polishing separation step to further separate fiber from filler/adhesive residue.
11. A component recovery process comprising:
providing a material feed including fiber, filler and adhesive;
shredding the material feed to liberate filler and adhesive from the fiber;
first screening the shredded material feed, forming a first screening effluent;
milling the first screening effluent stream to further liberate filler and adhesive from the fiber; and
second screening the milled first screening effluent stream, yielding at least two resultant streams, wherein
a first resultant stream comprises fiber suitable for depolymerization feed stocks; and
a second resultant stream comprises filler suitable for direct reinforcement in polymer resins;
combining the first resultant stream with a liquid to form a slurry; and
centrifuging the slurry at a G-Force of 30 G or less.
12. The component recovery process according to claim 11 , further comprising drying the material feed prior to shredding, drying the material feed enhancing the liberation of filler and adhesive from the fiber.
13. The component recovery process according to claim 11 , further comprising drying the effluent from one or both of the steps of shredding and first screening.
14. The component recovery process according to claim 11 , further comprising the introduction of electrostatic ionization prior to screening, electrostatic ionization directionally reducing triboelectric cling forces between the adhesive and the fiber, enhancing the liberation of adhesive from the fiber.
15. The component recovery process according to claim 11 , the material feed comprising a mixture of edge trim selvage and whole carpet, the mixture providing for increased purification of the resultant streams.
16. The component recovery process according to claim 11 , the material feed comprising a mixture of fibers comprising nylon type 6 and type 6,6.
17. The component recovery process according to claim 11 , further comprising, in series, a single cone centrifuge utilizing a water separation solution, and a continuous horizontal scroll/screen centrifuge.
18. The component recovery process according to claim 11 , further comprising an auxiliary dryer bypass step comprising a friction style agglomeration densifier.
19. The component recovery process according to claim 11 , further comprising a filler product treating step, comprising the step of sanitizing a stream of the process comprising a majority of filler.
20. The component recovery process according to claim 11 , further comprising a positive polarity electrostatic polishing separation step to further separate fiber from filler/adhesive residue.
21. The component recovery process according to claim 11 , further comprising a negative polarity electrostatic polishing separation step to further separate fiber from filler/adhesive residue.
22. A component recovery process comprising:
providing a material feed including fiber, filler and adhesive;
shredding the material feed to liberate filler and adhesive from the fiber;
first screening the shredded material feed, forming a first screening effluent;
milling the first screening effluent stream to further liberate filler and adhesive from the fiber;
second screening the milled first screening effluent stream, forming a second screening effluent;
granulating the second screening effluent stream;
slurrying the effluent of the granulating step to form a slurry; and
centrifuging at a G-Force of 30 G or less the slurry, yielding at least two resultant streams; wherein
a first resultant stream comprises a single polymer face fiber; and
a second resultant stream comprises filler and adhesive.
23. The component recovery process according to claim 22 , further comprising drying the material feed prior to shredding, drying the material feed enhancing the liberation of filler and adhesive from the fiber.
24. The component recovery process according to claim 22 , further comprising drying the effluent from one or both of the steps of shredding and first screening.
25. The component recovery process according to claim 22 , further comprising the introduction of electrostatic ionization prior to screening, electrostatic ionization directionally reducing triboelectric cling forces between the adhesive and the fiber, enhancing the liberation of adhesive from the fiber.
26. The component recovery process according to claim 22 , the material feed comprising a mixture of edge trim selvage and whole carpet, the mixture providing for increased purification of the resultant streams.
27. The component recovery process according to claim 22 , the material feed comprising a mixture of fibers comprising nylon type 6 and type 6,6.
28. The component recovery process according to claim 22 , further comprising an auxiliary dryer bypass step comprising a friction style agglomeration densifier.
29. The component recovery process according to claim 22 , further comprising a filler product treating step, comprising the step of sanitizing a stream of the process comprising a majority of filler.
30. The component recovery process according to claim 22 , further comprising a positive polarity electrostatic polishing separation step to further separate fiber from filler/adhesive residue.
31. The component recovery process according to claim 22 , further comprising a negative polarity electrostatic polishing separation step to further separate fiber from filler/adhesive residue.
32. A component recovery process comprising:
providing a material feed including fiber, filler and adhesive;
shredding the material feed to liberate filler and adhesive from the fiber;
first screening the shredded material feed, forming a first screening effluent;
milling the first screening effluent stream to further liberate filler and adhesive from the fiber;
second screening the milled first screening effluent stream, forming a second screening effluent;
granulating the second screening effluent stream;
slurrying the effluent of the granulating step to form a slurry; and
centrifuging at a high G-Force the slurry, forming a centrifuged effluent stream; and
centrifuging at a low G-Force the centrifuged effluent stream at <30 G.
33. The component recovery process according to claim 32 , further comprising drying the material feed prior to shredding, drying the material feed enhancing the liberation of filler and adhesive from the fiber.
34. The component recovery process according to claim 32 , further comprising drying the effluent from one or both of the steps of shredding and first screening.
35. The component recovery process according to claim 32 , further comprising the introduction of electrostatic ionization prior to screening, electrostatic ionization directionally reducing triboelectric cling forces between the adhesive and the fiber, enhancing the liberation of adhesive from the fiber.
36. The component recovery process according to claim 32 , the material feed comprising a mixture of edge trim selvage and whole carpet, the mixture providing for increased purification of the resultant streams.
37. The component recovery process according to claim 32 , the material feed comprising a mixture of fibers comprising nylon type 6 and type 6,6.