Method and device for recovering pure pvc from plastic waste...

B - Operations – Transporting – 29 – B

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B29B 17/02 (2006.01) B03B 1/04 (2006.01) B03B 5/34 (2006.01)

Patent

CA 2341230

According to the inventive method for recovering pure PVC from pre-reduced mixtures of substances containing PVC, the mixture of substances is steeped in a swelling agent for PVC and conveyed, under pressure, into a device comprising at least two series-connected hydrocyclones (15, 24). In the first hydrocyclone (15), a heavy fraction consisting of impurities is separated in the bottom flow and a light fraction consisting of swollen PVC particles and light impurities and plastic particles is separated in the top flow. The pre- purified light fraction is graded (23) and the particle fraction with the swollen PVC particles and the smaller plastic particles is fed to the second hydrocyclone (24), where the PVC particles are separated in the bottom flow. The invention also relates to a device for carrying out this method.

L'invention concerne un procédé de récupération de PVC pur à partir d'un mélange de matériaux contenant du PVC, matériaux qui ont été broyés au préalable. Le mélange de matériaux est détrempé dans un agent de gonflement pour PVC, et amené sous pression dans un dispositif comportant au moins deux hydrocyclones installés en série (15, 24). Dans le premier hydrocyclone (15), une fraction lourde constituée d'impuretés est séparée et emmenée par le courant descendant, et une fraction légère comportant des particules PVC gonflées, des impuretés légères et des particules de matière plastique est séparée et emmenée par le courant ascendant. La fraction légère prénettoyée est triée (23) et la fraction comportant les particules de PVC gonflées ainsi que des particules de matière plastique plus petites alimente le second hydrocyclone (24), dans lequel les particules de PVC sont séparées dans le courant descendant. L'invention concerne aussi un dispositif pour mettre en oeuvre le procédé.

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