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RHEWUM GmbH | 42875 Remscheid | Tel. +49 (0) 2191 - 5767 - 0 | info@rhewum.de

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Recycling materials

Recycling is defined as a process which produces a secondary raw material from waste or residues. Since recycling means every recovery technique which produces products, materials or substances for the original or another purpose it is a very wide range of processes with varying requirements for separation technologies.

Glass recycling is seen as the “prototype” of modern recycling economy. The production of glass using recycled material saves raw material and energy. The melting on of the base material mix after crushing and screening and optionally optical sorting need less time and lower temperatures.

Reclaimed building materials are mixtures with varying characteristics regarding to their origin. Ashes of waste combustion are belonging to this group of material. Even if they are coming from the same waste combustion plant their characteristics are also varying by and by. This can be observed especially in the fine and fines fractions. Regarding to the area of application after recycling these ashes are separated in various particle size fractions.

Fly ash is produced in the combustion process of hard coal in power plants using pulverised coal firing or grate firing. The particle size is fine as flour and they are consisting of 10 to 30% of sand particles and with largest particles of 0.5 mm (aluminosilicate glass with crystalline inclusions) and remains of unburnt coal.

Slag tap granulate is produced in the combustion process of hard coal in power plants with slag tap firing. Mineral impurities are melted and then cooled by water quenching. This produces a glass-like mineral mixture with fissured single grains. By crushing and screening this mixture is improved in quality.

Residues from quarries and secondary rock of hard coal are tailings from low-grade areas of the deposit. They have an irregular particle size distribution and therefore have to be screened to single particle size fractions. These materials are then relatively high-grade building materials.

Waste rubber from tires resp. natural rubber (caoutchouc) can be applied for modification of bitumen. The bitumen-rubber-mixture can be used for the surface treatment of split for its improved cohesive properties. Furthermore this mixture is used as joint sealing compound or as tension absorbing interface layer of membranes at gasket seals of bridges and asphalt beton connections. Challenging in screening of waste rubber from tires are the required fine screen cuts and the elastic behaviour of rubber granules.

Wood recycling means the crushing and screening of contaminant-free waste wood and the following thermal recycling or pressing to wood pellets for generation of energy. Feed materials are railway ties, waste wood, bulky waste after sorting as well as wood from forestry. One of RHEWUM´s machines screens up to 50 t/h wood dust and separates at 1mm to not affect the following conveyance negatively.