Device for the preparation of bituminous coated products comprising a drum with parallel streams and a countercurrent drum and corresponding process

Device for preparing bituminous coated products from recycled materials, virgin aggregates and liquid bitumen, said device comprising

• (a) a parallel flow drum having an entry end, means for feeding said entry end with recycled materials, a burner entering through said entry end, and an exit end for discharging dried and heated recycled materials;
• (b) a countercurrent drum having an entry end, means for feeding said entry end with cold virgin aggregates, an exit end, an elongate burner entering said countercurrent drum through its said exit end and opening into a flame zone distant from both ends of said countercurrent drum, a ring arranged around a side wall of said countercurrent drum and having apertures for introducing materials through said side wall, a device for injecting bitumen in an mixing zone of said countercurrent drum situated around said elongate burner and adjoining said exit end of said countercurrent drum;
• and
• (c) material transfer means connected both to said exit end of said parallel flow drum and to said ring of said countercurrent drum for introducing heated and dried recycled materials into said ring and through said apertures within said side wall of said countercurrent drum, into a recycling and mixing zone situated in said countercurrent drum between said flame zone and said mixing zone.