Waste fibrecement: An interesting alternative raw material for a sustainable Portland clinker production

This paper aims to examine the use of fibrecement waste as an alternative raw material for Portland clinker kilns with enumeration of possible limitations. Numerical simulations were carried out to maximise the use of fibrecement waste in clinker kilns taking into account the compositional variation of the waste, its behaviour within a clinker kiln, the impact on the energy consumption and finally the influence on the carbon footprint calculated from the decarbonation. Furthermore, experimental clinkers were produced corresponding with waste dosages that were esteemed as realistic by the numerical simulations. These clinkers were fully analysed and evaluated according to the above described evaluation concept.

► Quantified inorganic CO2 emission reduction and decarbonation energy gain.
► No significant chemical and mineralogical influence on the final clinker.
► Introduction at a hot point in the process is a necessity.
► Quantified energy gain by degradation of organic compounds.
► Estimated energy consumption for the liberation of chemically bound H2O.