US 12,214,362 B2
Process of recycling a bituminous waste product such as a waste bituminous membrane product
Guillaume Moreels, Bergensesteenweg (BE); Julien Dormal, Bergensesteenweg (BE); Caroline Martin, Bergensesteenweg (BE); Koen Sneiders, Bergensesteenweg (BE); and Patrick Cogneau, Bergensesteenweg (BE)
Assigned to Imperbel, Beersel (BE)
Appl. No. 17/776,077
Filed by IMPERBEL, Bergensesteenweg (BE)
PCT Filed Nov. 27, 2020, PCT No. PCT/EP2020/083766
§ 371(c)(1), (2) Date May 11, 2022,
PCT Pub. No. WO2021/105451, PCT Pub. Date Jun. 3, 2021.
Claims priority of application No. PCT/EP2019/083184 (WO), filed on Nov. 29, 2019.
Prior Publication US 2022/0388010 A1, Dec. 8, 2022
Int. Cl. B03B 9/06 (2006.01); B02C 18/00 (2006.01); B02C 18/06 (2006.01); B02C 19/00 (2006.01); B02C 23/08 (2006.01); B02C 23/38 (2006.01); C08L 95/00 (2006.01); C10C 3/00 (2006.01); B02C 23/14 (2006.01)
CPC B03B 9/061 (2013.01) [B02C 18/0084 (2013.01); B02C 18/06 (2013.01); B02C 19/0056 (2013.01); B02C 23/08 (2013.01); B02C 23/38 (2013.01); C08L 95/00 (2013.01); C10C 3/007 (2013.01); B02C 23/14 (2013.01); C08L 2555/34 (2013.01); Y02W 30/52 (2015.05)] 5 Claims
OG exemplary drawing
 
1. A process of recycling a bituminous product, or a bituminous membrane product containing reinforcement layers, the process comprising the steps of:
collecting waste bituminous products, or waste bituminous membrane products containing bituminous layers and reinforcement layers and sorting the waste bituminous products in a series of n waste bituminous product batch(es);
at least one grinding step of each batch of said series of n waste bituminous product batch(es) or of a mixture of n waste bituminous product batch(es), thereby forming a fine ground batch;
introducing said fine ground batch into a recycling unit having at least a rotor and a stator and a micronization chamber, said fine ground batch being heated and melted by shear strength upon an operation of the stator, rotor and micronization chamber and collecting a melted product; and
feeding said melted product in a mixing tank having a predetermined volume containing fresh carrier at a level comprised between 25 and 75w %, with respect to the predetermined volume, and at a residence temperature between 160 and 200° C., said mixing tank being continuously agitated with a horizontal screw having mixing blades, said melted product being fed in said mixing tank until a volume of the melted product is comprised between 25 and 75w %, with respect to the predetermined volume to provide a recycled bitumen at a temperature of 180° C. for pumpability and having a predefined viscosity between 500 and 45000 cPS, wherein said at least one grinding step comprises:
a first grinding of each batch of said series of n waste bituminous product batch(es) in a knife shredder for reducing a size of each batch into a first shredded batch having a mean particle size distribution between 20 and 50 cm;
a second grinding of each first shredded batch in a rotor granulator where each first shredded batch is reduced in size to a first crushed batch having a mean particle size distribution between 5 and 25 cm; and
a third grinding of each first crushed batch in a rotor granulator where each first crushed batch is reduced in size to a first ground batch having a mean particle size distribution between 20 and 50 mm.