Patent CA-3097633-A1 (CA)
Inventor: TEPLITSKY ALEXANDER
IPC: C09C1/48
Filed: 2019-03-05
Abstract: The invention relates to the field of recovering raw materials from rubber products, mainly recycled tires. A method of obtaining carbon-containing material from recyclable tires and/or rubber products, including: mechanically crushing raw materials from recycled tires and/or rubber products in a shredder; supplying a charge to a reactor and pyrolyzing at the pyrolysis temperature of rubber with the formation of vapor-gas products and a solid residue; continuously removing gaseous pyrolysis products from the reactor, followed by condensing liquid products into a condensation column of liquid fractions, unloading the solid residue from the reactor and cooling said residue; feeding the cooled residue into a crusher; coarsely crushing the solid residue; removing metal from the crushed solid residue in a magnetic separator; characterized in that, before mechanical crushing, metal bead rings are removed from the recycled tires; before feeding the charge into the reactor, a coking inhibitor is introduced into the charge in the amount of 3-20% by weight of the charge and consisting of a solid coking inhibitor component which is any combination of thermoplastic linear polymers selected from the group consisting of: polyethylene, polypropylene, polyethylene terephthalate, polystyrene: and a liquid coking inhibitor component, polymethylsiloxane, in the amount of 0.5-1.0% by weight of the inhibitor; the pyrolysis of the charge in the reactor is carried out at a pyrolysis temperature of from 350°C in the main working zone of the reactor to 600°C at the exit of the reactor; the removal of metal from the crushed solid residue in the magnetic separator is performed until the metal content is not more than 0.1% of the total mass of the solid residue, after which the solid residue is processed and activated with superheated steam at a temperature of 250-350°C in a steam chamber, and the activated solid residue is ground in a vortex mill; two-stage classification of the solid residue is carried out: at an air elutriator, from which the fine fraction is sent into an electrical mass classifier for further fine classification, and the large fraction screenings are sent to a hopper and further, or to a thermal furnace, in which residual carbon is removed and an additional product, which is a mineral component, is produced, or are sent for re-grinding into the vortex mill, where the fine fraction of the solid residue in the electrical mass classifier is divided into fraction F1, which is smaller than 45 µm (F1<45 µkm), and fraction F2, which is larger than 45 µkm (F2>45 µkm); the solid residue powder of the F2 fraction, which is larger than 45 µkm (F2>45 µkm), is returned from the electrical mass classifier into the vortex mill for repeated fine grinding; the powder fraction F1 smaller than 45 µm (F1<45 µm) is sent from the electric mass classifier to a storage hopper and then to a packaging machine or granulator. Next, the prepacked product is sent to a consumer or to a warehouse. Technical result: obtaining carbon-containing material from recyclable tires and/or rubber products, which is suitable in the manufacture of new tires and/or rubber products.