Cooling screw for thermal cleaning of tar asphalt
°Celsius has designed and produced a number of screw heat exchangers for the `Van Bentum Recycling Centrale` in Rotterdam to cool tar asphalt (TAG) in a continuous process from 600°C to 50°C.
The `Van Bentum Recycling Centrale`, with nine plants in the Netherlands, is market leader in the field of recycling mineral construction and demolition waste and also a supplier of aggregates to the civil engineering, road construction and hydraulic engineering industry.
The Dutch authorities want to remove tar asphalt from `the chain` once and for all, so since 2001, the re-use of uncleaned TAG is no longer permissible. All tar asphalt removed during reconstruction must be thermally cleaned.
In theory cleaning tar asphalt is simple. TAG consists of sand, gravel and a pollutant binder, namely tar. The tar is removed from the asphalt by heating at a high temperature. The pollutant gases released are also cleaned. This leaves clean sand, gravel and filler. The thermal cleaning