| abstract |
The present invention relates to a process for coloring building materials such as concrete or asphalt using inorganic pigment granules, characterized in that inorganic pigments are mixed with binders to form a cohesive powder in a mixer (1), this cohesive powder undergoes a compacting step (2) at line forces from 0.1 to 15 kN / cm, the resulting flakes with a density of 0.5 to 3.0 g / cm³ are broken down into germs and powder by subsequent grinding on a sieve granulator (3) and these are rolled up on a turntable ( 4) or completely granulated in a rotating drum and mixed with the building materials. |