Method and a device for separating plastic particles from supens

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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Details

204132, 209 12, 209155, D21B 132

Patent

active

052904016

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a method for separating plastic particles from a suspension, e.g. from a cellulose mass or cellulose pulp suspension, in which the fiber-floc material is broken for loosening the plastic particles.
The invention also relates to a device for separating plastic particles from a suspension, e.g. from a cellulose mass and paper fiber suspension.
In many previously known solutions, the removal of the plastic from among the cellulose fibers has mainly been based on the density of the plastic, either in a liquid phase or in centrifugal methods.
The earlier FI patent application 885180 or U.S. Pat. No. 5,062,932 by the applicant describes a method and a device for separating plastic particles from solutions, which approach is based on an electrical separation of plastic particles. In this known method, the plastic particles in the solution have been separated electrically by placing in the solution an anode and a cathode and by adjusting the potential of the anode and the cathode so that it is possible to separate the plastics from the solution.
The object of the present invention is to provide a method and a device for separating plastics from a suspension, e.g. cellulose suspension, to be able to analyze the quantity of the plastics in the suspension and perform necessary studies, related e.g. to the origin and quality of the plastic, etc.
The method according to the invention is mainly characterized in that in the method the particles to be separated are separated from the remaining mass as the fiber network is decomposing, whereby lighter particles are separated, that a concentration difference is achieved, which prevents the fiber network from reforming and thereby the plastic particles from binding thereto, and are separated from the suspension.
The device according to the invention is mainly characterized in that the device comprises a container and guiding means fitted thereto for achieving turbulent flows and means for diluting and/or orientating the suspension and that the device further comprises separating means for separating the particles from the suspension.
In other embodiments of the present invention, the plastic particles are separated from the suspension at a separation point either mechanically, electrically, or both. The plastic particles (P) can also be separated by means of a collecting scoops on a collector or guided to a surface of the container and then separated into an overflow of the container. Other possible embodiments are described.
It is essential in the inventive method and device that the turbulence causes the breaking of the fiber/floc material as a result of shearing forces. The turbulence can be achieved by means of a liquid jet, as described above, but it is also possible to use a rotatable cylindrical rotor, or by allowing two separate mass flows to collide against each other. In addition, the turbulence can also be achieved so that a mass suspension is sprayed within the mass suspension by means of pressure. It is also possible to mix the mass mechanically under the surface.
It is also essential in the inventive method and device that the height of the turbulence area is low, whereby the plastic particles have a short way to transfer to the surface of the suspension material container. It is also advantageous that another turbulence area is achieved after the first guide plate. Different consistency gradients are caused to the suspension in the container by the interaction of the turbulences and the liquid flows. The plastic particles can then loosen from the fiber/floc material and cannot return to the fiber. For intensifying the consistency gradients, it is also possible to add to the surface of the suspension material mixture a material with a consistency of 0% by spraying thereon e.g. more liquid.
Instead of the flow guiding plates, the flow can also be guided e.g. by changing the shapes of the container.
It is also possible to break the fiber/floc material for loosening the plastic particles so that a momentary reduction is caused to the suspe

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