  The size and density of dust grains determine their response to gas drag in
protoplanetary discs. Aerodynamical (size x density) sorting is one of the
proposed mechanisms to explain the grain properties and chemical fractionation
of chondrites. However, the efficiency of aerodynamical sorting and the
location in the disc in which it could occur are still unknown. Although the
effects of grain sizes and growth in discs have been widely studied, a
simultaneous analysis including dust composition is missing. In this work we
present the dynamical evolution and growth of multicomponent dust in a
protoplanetary disc using a 3D, two-fluid (gas+dust) Smoothed Particle
Hydrodynamics (SPH) code. We find that the dust vertical settling is
characterised by two phases: a density-driven phase which leads to a vertical
chemical sorting of dust and a size-driven phase which enhances the amount of
lighter material in the midplane. We also see an efficient radial chemical
sorting of the dust at large scales. We find that dust particles are
aerodynamically sorted in the inner disc. The disc becomes sub-solar in its
Fe/Si ratio on the surface since the early stage of evolution but sub-solar
Fe/Si can be also found in the outer disc-midplane at late stages. Aggregates
in the disc mimic the physical and chemical properties of chondrites,
suggesting that aerodynamical sorting played an important role in determining
their final structure.
