Objective
The aim of the project is the development of an asphalt mixing plant to turn the residue (waste slags) produced by waste incinerators into qualified bituminous products. The process will be fuelled by dehydrated and densified sewage sludge from urban water purification processes. This demonstration project is applicable to any one of more than 9,000 existing asphalt mixing plants in Europe. In particular, those fine fractions of wet ashes still being thrown away by the recycling market can be used to substitute natural sand in a process similar to the proven set-up with any conventional plant. The final product quality meets the current standard requirements. It also works with recycled asphalt.
In the process described here, the sand ratio (d = 0 - 4 mm) in a specific asphalt formula is replaced by a certain slag material. This requires an additional feeder facility with facilities for weighing or dosing and stocking. The slag enters the drying drum along with the mineral right from the start. Further processing of the material mixture is carried out in the same way as in any traditional asphalt mixing facility. However, the drum must have a different basic configuration to ensure the quality of the new product. This process sludge, delivered in the form of pellets, is used instead of gas or heating oil. In the rear wall of the drum, there is a solids blow burner for fuel. As dust has to be adjusted to the new drum conditions, the drum is thus constructed similar to a coal-dust burner.
Topic(s)
Data not availableCall for proposal
Data not availableFunding Scheme
CSC - Cost-sharing contractsCoordinator
34123 Kassel
Germany